阅读说明：本技术 手持式工具机 (Hand-held power tool ) 是由 M·陶贝尔 I·维尔纳 H·博伊特尔 A·施特拉塞尔 H·施密德 于 2021-05-25 设计创作，主要内容包括：本发明的出发点是手持式工具机(10),尤其是电镐、钻锤和/或凿锤,其具有至少一个电动马达(22)、工具单元(16)和至少一个操作单元(14)并且具有马达切换单元(66),所述马达切换单元构造用于感测在工具单元(16)和操作单元(14)之间的压紧力特征参量。提出,马达切换单元(66)构造用于至少部分与压紧力特征参量相关地切换电动马达(22)。(The starting point of the invention is a hand-held power tool (10), in particular a chisel, drill and/or chisel hammer, having at least one electric motor (22), a tool unit (16) and at least one operating unit (14), and having a motor switching unit (66) which is designed to sense a pressing force characteristic variable between the tool unit (16) and the operating unit (14). It is proposed that the motor switching unit (66) is designed to switch the electric motor (22) at least partially as a function of the pressing force characteristic variable.)

1. Hand-held power tool, in particular a power pick, a drill hammer and/or a chisel hammer, having at least one electric motor (22), having a tool unit (16) and at least one operating unit (14), and having a motor switching unit (66) which is designed to sense a pressing force characteristic variable between the tool unit (16) and the operating unit (14), characterized in that the motor switching unit (66) is designed to switch the electric motor (22) at least partially as a function of the pressing force characteristic variable.

2. The hand-held power tool according to claim 1, characterized by a pneumatic percussion mechanism (20) and a tool receiver (38) for receiving a tool (40), wherein the tool (40) can be driven along a working axis (54), and wherein the motor switching unit (66) is designed to reduce the motor speed of the electric motor (22), in particular to a standstill, on the basis of the sensed pressing force characteristic variable.

3. The hand-held power tool according to claim 1 or 2, characterized by a pneumatic impact mechanism (20) and a tool receiver (38) for receiving a tool insert (40), wherein the tool insert (40) can be driven along a working axis (54), wherein the motor switching unit (66) is designed to reduce the motor speed of the electric motor (22) on the basis of the sensed pressing force characteristic such that an activation of the impact mechanism is avoided.

4. The hand-held power tool according to one of the preceding claims, characterized in that the motor switching unit (66) is configured for passively and/or actively braking the electric motor (22).

5. The hand-held power tool according to one of the preceding claims, characterized in that the tool unit (16) is at least partially formed by an impact mechanism housing (26).

6. The hand-held power tool according to one of the preceding claims, characterized in that the operating unit (14) is at least partially formed by a main handle housing (18).

7. The hand-held power tool according to one of the preceding claims, wherein the motor switching unit (66) is designed for assigning an activation state (92) of the electric motor (22) to a measurement range of the contact pressure characteristic variable.

8. The hand-held power tool according to one of the preceding claims, characterized in that the motor switching unit (66) is configured for switching the electric motor (22) at least partially in a time-dependent manner.

9. The hand-held power tool according to one of the preceding claims, characterized in that the motor switching unit (66) is configured for switching the electric motor (22) at least partially in dependence on a torque.

10. Hand-held power tool according to one of the preceding claims, characterised by a cover unit (12), wherein the motor switching unit (66) has at least one actuating element (72) which is completely covered by the cover unit (12).

11. Hand-held power tool according to one of the preceding claims, characterized in that the motor switching unit (66) has at least one switching element (76) which is designed to be correlated with the pressing force characteristic variable and which is designed to control and/or regulate the motor speed of the electric motor (22) in at least one speed range.

12. Hand-held power tool according to one of the preceding claims, characterised in that at least one backup switch (68) is provided, which is designed to switch the electric motor (22) into a standby state, in particular without rotational speed, or from a standby state, in particular without rotational speed, into a safety state.

13. Hand-held power tool according to at least claim 12, characterized in that the at least one backup switch (68) is designed as a contact switch and/or as a signal switch.

14. Hand-held power tool according to one of the preceding claims, characterised in that it has a configuration without a percussion mechanism control device.

15. Hand-held power tool according to one of the preceding claims, characterised by a hammer tube (46), in particular a guide, which is designed without a closable opening, in particular a control opening or an idle opening, and/or by at least one impact mechanism housing (26) and at least one impact bolt (48), which is mounted in the impact mechanism housing (26) at least substantially immovably in an impact direction (52).

Background

A hand-held power tool, in particular a power pick, a drill hammer and/or a chisel hammer, has already been proposed, which has at least one electric motor, a tool unit and at least one operating unit, and a motor switching unit which is designed to sense a pressing force characteristic variable between the tool unit and the operating unit.

Disclosure of Invention

The invention is based on a hand-held power tool, in particular a chisel, drill and/or chisel hammer, having at least one electric motor, a tool unit and at least one operating unit, and having a motor switching unit which is designed to sense a pressing force characteristic variable between the tool unit and the operating unit.

It is proposed that the motor switching unit is designed to switch the electric motor at least partially as a function of the pressing force characteristic variable.

Preferably, the hand-held power tool is designed as a portable power tool, such as a power pick, a drill hammer and/or a chisel hammer. However, other configurations of the hand-held power tool are also conceivable, which are considered to be of interest to the person skilled in the art. Preferably, the hand-held power tool has a weight of maximally 30kg, preferably maximally 15 kg. The hand-held power tool preferably has a tool receiver. The hand-held power tool preferably has a main handle housing. The tool receiver is preferably arranged on a tool unit of the hand-held power tool. The main handle housing is preferably arranged on the operating unit. Preferably, the operating unit is mounted movably, in particular movably, relative to the tool unit. The hand-held power tool preferably defines a longitudinal axis. Preferably, the operating unit is mounted movably relative to the tool unit, preferably at least substantially parallel to the longitudinal axis, via a bearing unit of the hand-held power tool. The bearing unit preferably has at least one spring unit to dampen the bearing movement and/or the impact operation on the operating unit. Preferably, the bearing unit is provided for enabling force transmission from the tool unit to the operating unit. A "longitudinal axis" of an object is to be understood to mean, in particular, a geometric axis which runs parallel to the longest edge of the smallest geometric cuboid which exactly completely surrounds the object. The longitudinal axis of the hand-held power tool extends through the hand-held power tool in the direction of the tool receiver proceeding from a main handle, which is formed by a main handle housing. The longitudinal axis extends at least substantially parallel to the axis of rotation of the hand-held power tool, in particular of the tool holder. The axis of rotation of the hand-held power tool, in particular the axis about which the tool holder can be rotated, in particular in at least one operating state. In particular, the motor switching unit is arranged on the hand-held power tool in an at least substantially externally invisible manner. Preferably, the motor switching unit is arranged at least substantially completely within the hand-held power tool. "an object is arranged at least substantially completely inside the hand-held power tool" is to be understood in particular to mean: an imaginary straight line running through the motor switching unit from a geometric center point of a longitudinal axis in the hand-held power tool intersects at least one further part of the hand-held power tool, which is different from the motor switching unit, in particular at least one housing part, on a side of the longitudinal axis facing away from the center point. "substantially parallel" is to be understood here to mean, in particular, an orientation of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation relative to the reference direction of, in particular, less than 8 °, advantageously less than 5 °, and particularly advantageously less than 2 °.

Preferably, the motor switching unit is designed for sensing and processing a pressing force characteristic variable between the tool unit and the operating unit. In particular, the motor switching unit comprises at least one sensor element for sensing a characteristic variable of the contact pressure.

The term "pressing force characteristic" is preferably understood to mean a characteristic variable with which the pressing force can be inferred, wherein the pressing force characteristic is formed in particular in relation to the pressing force between the tool unit and the operating unit. Preferably, the pressing force characteristic variable is directly or indirectly proportional to the pressing force between the tool unit and the operating unit. For example, the pressing force characteristic variable may be a stroke length of an element, for example a sensor element, in particular a piezoelectric sensor element, in tension or compression. For example, the characteristic variable of the contact pressure can be the frequency, in particular the frequency shift, of an electromagnetic or acoustic wave, which is influenced, for example, by a stretched or compressed sensor element, for example by a bragg fiber. For example, the pressing force characteristic variable can be designed as a force or a pressure. For example, the contact pressure characteristic can also be designed as a voltage or current intensity, in particular as sensed by a piezoelectric sensor element. In particular, the pressing force characteristic variable can also be designed as a torque. Preferably, the at least one sensor element is designed as a force sensor, an optical sensor, in particular a light barrier, a motion sensor, in particular an acceleration sensor and/or a speed sensor. Preferably, the sensor element is designed for sensing a characteristic variable of the contact pressure that is at least partially continuously variable. Alternatively, the at least one sensor element can be designed as a mechanical switch, which can sense a binary pressing force characteristic variable. Preferably, the sensor element is designed to sense a relative movement of the operating unit relative to the tool unit and/or to be actuated during the relative movement, in particular in the region of the relative movement. The sensor element can be designed in particular as a reed switch. The sensor element can be designed in particular as a proximity switch, a magnetic switch and/or an ultrasonic switch. The motor control unit can be designed as an acceleration control unit which switches the rotational speed of the electric motor and preferably controls and/or regulates the relative movement of the actuating unit relative to the tool unit in proportion to the contact pressure characteristic variable.

Preferably, the motor switching unit is designed as a motor control unit and/or a motor control unit. Preferably, the motor switching unit is designed to switch the electric motor on, in particular to adjust the motor speed of the electric motor from zero to a speed different from zero. Preferably, the motor switching unit is configured for switching off the electric motor. Preferably, the motor switching unit is configured to adjust the rotational speed of the electric motor from a rotational speed different from zero to zero. Preferably, the motor switching unit is designed to control and/or regulate a motor speed of the electric motor on the basis of the sensed pressing force characteristic variable. Preferably, the motor switching unit is designed to increase the motor speed of the electric motor on the basis of the sensed pressing force characteristic variable. Preferably, the motor switching unit is designed to increase the motor speed of the electric motor, based on the sensed pressing force characteristic variable, if the pressing force corresponding to the pressing force characteristic variable increases. Preferably, the motor switching unit is designed to increase the motor speed of the electric motor to a maximum speed, based on the sensed pressing force characteristic variable, if the pressing force increase corresponding to the pressing force characteristic variable exceeds a threshold value.

The motor switching unit is preferably designed to put the hand-held power tool into rotary operation on the basis of the sensed pressing force characteristic variable. In this rotary operation, the electric motor drives the tool insert arranged in the tool receptacle in rotation. Preferably, the motor switching unit is designed to switch the hand-held power tool into impact operation on the basis of the sensed pressing force characteristic variable, in particular when the sensed pressing force characteristic variable exceeds a threshold value. In this impact mode, the electric motor drives an impact, in particular a periodic impact, of the inserted tool arranged in the tool receptacle. The motor switching unit is preferably designed to switch the hand-held power tool into impact mode if the threshold value, in particular the impact limit value, is exceeded on the basis of the sensed pressing force characteristic variable. The motor switching unit can be designed to simultaneously switch the hand-held power tool into the rotary mode and into the impact mode. The motor switching unit can be designed to increase the rotational speed of the rotary operation as the contact pressure characteristic, in particular the contact pressure, increases until a maximum rotational speed of the rotary operation is reached, in particular until a shock limit value is reached, from which the shock operation is started. In particular, at least one sensor element can be arranged and/or configured as an end stop sensor element. In particular, at least one sensor element can be pressure-sensitive. Alternatively or additionally, the motor switching unit can have a switch which is designed as an accident-proof safety switch, which is arranged in particular outside the cover unit.

The configuration of the invention of the hand-held power tool advantageously enables uncomplicated operation of the hand-held power tool. In particular, the risk of accidentally operating the hand-held power tool can be advantageously reduced. In particular, the visual appearance can advantageously be changed compared to the conventional practice of operating elements like a pistol. In particular, external operating elements can advantageously be dispensed with altogether. It is possible to advantageously protect the cable, in particular to arrange the cable completely within the hand-held power tool. In particular, the user can place the workpiece with advantageous specificity.

It is also proposed that the hand-held power tool have a pneumatic percussion mechanism and a toolIn particular, the tool receiver mentioned above for receiving the insertion tool mentioned above, wherein the insertion tool can be driven along the working axis, and wherein the motor switching unit is designed to reduce the motor speed of the electric motor, in particular to a standstill, on the basis of the sensed pressing force characteristic variable. For example, the tool receiving portion can be configured as a jaw chuck,A tool receiving portion,A Plus tool receiving part,Max tool receivers or the like. Preferably, the working axis is oriented at least substantially parallel to the rotational axis and/or the longitudinal axis of the hand-held power tool. Preferably, the motor switching unit is designed to reduce the motor speed of the electric motor, based on the sensed pressing force characteristic variable, if the pressing force corresponding to the pressing force characteristic variable is reduced. Preferably, the motor switching unit is designed to reduce the motor speed of the electric motor to a standstill, based on the sensed pressing force characteristic variable, if the pressing force corresponding to the pressing force characteristic variable falls below a threshold value. An advantageous long-lasting hand-held power tool can be realized. In particular, the risk of impact effects on the hand-held power tool, in particular on a user of the hand-held power tool, can advantageously be reduced.

Furthermore, it is proposed that the hand-held power tool has a pneumatic impact mechanism and a tool receiver for receiving an insertion tool, wherein the insertion tool can be driven along a working axis, wherein the motor switching unit is designed to reduce the motor speed of the electric motor on the basis of the sensed contact force characteristic such that an activation of the impact mechanism is avoided. "avoiding the activation of the impact mechanism when the motor speed decreases" is to be understood in particular as: at a reduced motor speed, the air spring pressure in the pneumatic percussion mechanism is at most 50%, preferably at most 30%, particularly preferably at most 20% and very particularly preferably at most 10% of the maximum air spring pressure in the pneumatic percussion mechanism during a percussion mode. Preferably, the maximum air spring pressure in the impact mode is approximately 10 bar. In particular, the maximum air spring pressure is the maximum pressure reached in the hammer tube between the piston and the striker. An advantageous long-lasting hand-held power tool can be realized. In particular, it can advantageously be avoided that the impact action poses a risk to the hand-held power tool, in particular to a user of the hand-held power tool.

Furthermore, it is proposed that the motor switching unit is designed for passively and/or actively braking the electric motor. Preferably, the electric motor is configured as a DC/EC motor or as an AC/EC motor. Preferably, the motor switching unit is configured for braking the electric motor by short-circuiting or reverse energization. Preferably, the motor switching unit is designed to passively and/or actively brake the motor speed of the electric motor, based on the sensed pressing force characteristic variable, with a reduction in the pressing force corresponding to the pressing force characteristic variable. In particular, the sensor element designed as a proximity switch may already have the intention of adjusting, sensing the operation and specifically actively braking the electric motor, in particular up to 75ms faster than in the case of the sensor element designed as a pressure switch. In particular, an advantageously faster standstill of the motor can be achieved during the adjustment of the operation of the hand-held power tool. Alternatively, the electric motor can also be brought to a standstill (auslaufen) without braking, in particular without regulating the rotational speed. In particular, the risk of injury to a user of the hand-held power tool can advantageously be limited. In particular, idle impacts (Leerschlag) can advantageously be avoided.

Furthermore, it is proposed that the tool unit is formed at least partially by the striking mechanism housing. Preferably, the tool unit is at least partially formed by the impact mechanism housing and the tool receiver. Preferably, the tool unit is at least partially formed by an electric motor. The impact mechanism housing is preferably designed as an inner housing. An advantageously large and protected tool unit can be realized. Advantageous operability of the motor switching unit can be achieved.

It is also proposed that the operating unit is formed at least partially by the main grip housing. Preferably, the operating unit is at least largely formed by the main handle housing. Preferably, the main handle housing forms a main handle at one end of an extension of the longitudinal axis of the hand-held power tool. The main handle housing can have an additional grip. The main handle housing is preferably configured as an outer housing. An advantageously large and protected operating unit can be realized. Advantageous operability of the motor switching unit can be achieved.

Furthermore, it is proposed that the motor switching unit is designed to assign the activation state of the electric motor to a measurement range of the contact pressure characteristic variable. The measurement range is preferably configured as a range of the pressing force characteristic variable above or below at least one threshold value, in particular depending on the ratio of the pressing force characteristic variable to the pressing force. Preferably, the motor switching unit is designed to bring the electric motor into an active state within the measuring range. Preferably, the active state of the electric motor is a state of the electric motor having a rotational speed different from zero, in particular a state for a rotary and/or percussion operation of the hand-held power tool. The advantageous on/off state control can be realized by a motor switching unit which can be programmed particularly advantageously for different use conditions. For example, an advantageous low-noise indoor drilling procedure for concrete walls can be achieved. Alternatively, an advantageously robust outdoor drilling procedure for asphalt, stone or the like can be achieved.

It is further proposed that the motor switching unit is designed for switching the electric motor at least partially in dependence on time. Preferably, the motor switching unit is designed to switch the electric motor at least partially in a time-dependent manner with reference to at least one threshold value exceeding and/or falling below the pressing force characteristic variable. In particular, the motor switching unit can be designed to change the rotational speed of the electric motor, in particular when the pressing force characteristic variable increases and/or decreases, if at least one threshold value of the pressing force characteristic variable is exceeded and/or undershot for longer than a defined period of time. Advantageously uniform, in particular insensitive, rotational and/or impact running can be achieved. It is further proposed that the motor switching unit is designed for switching the electric motor at least partially as a function of the torque. The pressing force characteristic variable is preferably designed as a torque, as a characteristic variable proportional to the torque, and/or as a characteristic variable from which the torque can be calculated. Preferably, the motor switching unit is designed to determine the torque, preferably from the pressing force characteristic variable. In particular, the motor switching unit can comprise a further sensor element for sensing a torque characteristic variable. The torque characteristic variable is preferably designed as a torque, as a characteristic variable proportional to the torque, and/or as a characteristic variable from which the torque can be calculated.

Preferably, the motor switching unit is designed to switch the electric motor at least partially in dependence on the torque with reference to at least one threshold value exceeding and/or falling below the pressing force characteristic variable and/or the torque characteristic variable. In particular, the motor switching unit can be designed to change the rotational speed of the electric motor, in particular when the pressing force characteristic variable and/or the torque characteristic variable increases and/or decreases, if at least one threshold value of the pressing force characteristic variable and/or the torque characteristic variable is exceeded and/or undershot for longer than a defined period of time. Advantageously uniform, in particular insensitive, rotational and/or impact running can be achieved. In particular, when the hand-held power tool is switched off and/or when the contact pressure of the hand-held power tool is reduced, it can be advantageously ensured that chips are sucked out of the workpiece.

Furthermore, it is proposed that the hand-held power tool have the above-mentioned cover unit, wherein the motor switching unit has at least one actuating element, which is completely covered by the cover unit. Preferably, the cover unit is at least largely formed by the main handle housing and by the striking mechanism housing. The cover unit can be formed in part by the bearing housing of the bearing unit. In particular, the cover unit is designed as a multi-shell housing. In particular, the actuating element can be arranged in particular in the bearing housing. Preferably, the actuating element is formed at least partially by at least one sensor element of the motor switching unit. Preferably, at least one actuating element, in particular each actuating element, of the motor switching unit is arranged at least substantially completely within the hand-held power tool. The term "at least one actuating element is arranged at least substantially completely within the interior of the hand-held power tool" is to be understood in particular to mean: an imaginary straight line running through the motor switching unit from a geometric center point of a longitudinal axis in the hand-held power tool intersects at least one further portion of the hand-held power tool, which is different from the motor switching unit, in particular at least one portion of the cover unit, on a side of the longitudinal axis facing away from the center point. Advantageously, a non-rotational-speed placement of the machine on the workpiece to be machined can be achieved. In particular, the safety standard of the hand-held power tool can be advantageously increased. It can be achieved that the electric motor is switched only when needed. An advantageous energy-saving hand-held power tool can be constructed.

Furthermore, it is proposed that the motor switching unit has at least one switching element which is designed to be dependent on the pressing force characteristic variable and is designed to control and/or regulate the motor speed of the electric motor in at least one speed range. Preferably, the switching element is designed to control and/or regulate the motor speed of the electric motor in at least one speed range if the pressing force characteristic exceeds a threshold value. Preferably, the rotational speed range is a rotational speed range between a minimum rotational speed, in particular a shock activation rotational speed, different from zero and a maximum rotational speed. Preferably, the shock activation rotational speed corresponds to a maximum rotational speed of the rotary operation in the absence of a shock operation, in particular a rotational speed when the contact pressure characteristic has reached a threshold value for shock activation. Preferably, the switching element is designed to switch the electric motor to a standard rotational speed, in particular to an idle rotational speed, in particular without controlling or regulating the electric motor, if the pressing force characteristic variable already does not exceed a threshold value for rotational and/or impact operation. Alternatively, the shift element can be designed to monitor, in particular control and/or regulate, the idling rotational speed. An advantageous uncomplicated rotational speed start-up phase of the electric motor can be achieved. An advantageous operating speed phase can be achieved in which the speed of the electric motor is continuously controlled and/or regulated in a speed range as a function of the contact pressure characteristic variable.

Furthermore, it is proposed that the hand-held power tool have at least one backup switch, which is designed to switch the electric motor into a standby state, in particular without rotational speed, or from a standby state, in particular without rotational speed, into a safety state. Preferably, the standby state is configured as a supply state of the electric motor, in which the electric motor is electrically connected to the energy source. Alternatively or additionally, the standby state can be configured as a blocking state of the relative movement of the tool unit with respect to the operating unit. Preferably, the hand-held power tool comprises at least one display unit, in particular a light unit and/or an acoustic unit, for visually and/or audibly displaying the standby state. The display unit can alternatively or additionally be designed as a haptic feedback unit, which triggers, in particular, a light-impact operation with a low rotational speed different from zero. In particular, the display unit can be designed to emit different tones, preferably from an acoustic signal to a melody, for example by means of a rotational speed bump (Drehzahlschub) on the electric motor. In particular, the display unit can be designed as a work light of the hand-held power tool, which is designed to illuminate the workpiece to be machined. In particular, the display unit can be configured for displaying different flashing patterns and/or flashing frequencies, brightness and/or color shifts. Advantageously, the risk of injury as a result of an accidental start of the hand-held power tool can be reduced.

It is further proposed that the at least one backup switch is designed as a contact switch and/or as a signal switch. The at least one backup switch is preferably designed in at least one switching state to interrupt the supply of power to the electric motor. The at least one backup switch can alternatively or additionally be designed in at least one switching state for locking the relative movement of the tool unit with respect to the operating unit. The backup switch can be designed in particular as a pressure switch, a slide switch or the like. In particular, the backup switch can be designed as a capacitive switch or as an inductive switch, in particular for detecting the presence of a user. The backup switch can be designed in particular as a reed switch. The backup switch can be designed in particular as a proximity switch, a magnetic switch and/or an ultrasonic switch. Advantageously, the risk of injury as a result of an accidental start of the hand-held power tool can be reduced.

Furthermore, it is proposed that the hand-held power tool has a construction without a percussion mechanism control device. The expression "hand-held power tool having a control device without an impact mechanism" should preferably be understood to mean: the hand-held power tool is configured without an impact mechanism control device that is different from the motor switching unit. In particular, the motor switching unit is designed to control and/or regulate, in particular, the percussion and rotary operation of the drill hammer. In particular, the motor switching unit is designed to switch the percussion operation on or off at least in a binary manner. Preferably, the motor switching unit is designed to control and/or regulate the impact operation as a function of the contact pressure characteristic variable. In particular, the motor switching unit is designed to control or regulate, in particular, the percussion operation and the rotary operation of the drill hammer. An advantageously compact and/or lightweight hand-held power tool can be constructed. In particular, a hand-held power tool can be constructed which is advantageously short along the longitudinal axis. In particular, the tool receiver can be configured without an idle stroke. In particular, the insertion tool preferably rests against a part of the pneumatic percussion mechanism in each operating state. It can advantageously be achieved that the work can be carried out horizontally and/or overhead without idle impacts. A particularly advantageously wear-resistant hand-held power tool is realized by an advantageously lightly loaded seal and/or damper, for example, at the pneumatic percussion mechanism.

Furthermore, it is proposed that the hand-held power tool have: in particular, the hammer tube, in particular the guide, which is designed without closable openings, in particular control openings or idle openings, is already mentioned; and/or at least one impact mechanism housing and at least one impact bolt, which is mounted in the impact mechanism housing at least substantially immovably in the impact direction. The hammer tube is in particular designed as a guide for guiding a part of the pneumatic percussion mechanism, in particular a piston, a percussion mechanism, a percussion bolt or a punch. In particular, the hammer tube can be configured without a control opening or idle opening. The impact bolt is mounted "at least substantially immovably" in the impact direction in the impact mechanism housing, preferably to be understood as: the impact bolt is mounted in the impact mechanism housing so as to be immovable in the impact direction, except for a deviation of at most 5mm, preferably at most 2mm, particularly preferably at most 0.5mm, which is determined by the damping. An advantageous compact hand-held power tool can be realized. In particular, the seal for the impact bolt can be designed as an advantageous, low-wear and/or low-cost static seal. It is possible that the user only has to apply a advantageously small contact pressure to operate the hand-held power tool. The tool receiver can be designed in particular to be larger, preferably longer-meshed, which advantageously increases the stability. In particular, the vibration load acting on the hand-held power tool can be advantageously reduced.

Furthermore, it is proposed that the hand-held power tool has a battery unit. Preferably, the battery unit is detachably connected to the hand-held power tool. Preferably, the accumulator unit is designed to supply the hand-held power tool with electrical energy as a primary energy source. The battery unit is used to configure the hand-held power tool, in particular as a mobile hand-held power tool. Alternatively, the hand-held power tool can be designed for operation with a cable connected to the socket. An advantageous mobility of the hand-held power tool can be achieved.

In particular, the motor switching unit can be designed to place the pneumatic percussion mechanism into a continuous percussion state. In particular, the motor switching unit can be designed to reduce the motor speed, in particular actively, when the backup switch is switched off. Advantageous idle oscillations, advantageous noise generation and/or advantageous energy consumption can be achieved. The backup switch can be connected to the motor switching unit via an electromechanical coupling, preferably for switching the electric motor on and/or off particularly quickly. The hand-held power tool preferably has a transmission unit. The backup switch can be bridged for a permanent motor function, in particular when a mechanical coupling is triggered or a change in the frequency band of the acceleration sensor is detected by current monitoring in the case of a hammer drill. In particular, a stuck drill bit can be put into rotation by coupling torque. In particular, the hand-held power tool can have a mode switch for sensing a desired operating mode, in particular a percussion operation and/or a rotary operation. Preferably, the mode switch can be controlled by a mobile phone application software. In particular, the bump operation and/or the spin operation are configured to be selectable by the handset application software. The backup switch can be configured as a bistable switch.

The hand-held power tool according to the invention is not intended to be limited to the above-described applications and embodiments. In particular, the hand-held power tool according to the invention can have a different number of individual elements, components and units than the number mentioned in this document in order to satisfy the functional manner described in this document. Furthermore, in the context of the value ranges given in this publication, values within the mentioned boundaries should also be regarded as being disclosed and able to be used at will.

Drawings

Further advantages are obtained from the following description of the figures. Embodiments of the invention are illustrated in the drawings. The figures, description and claims contain various combinations of features. Those skilled in the art can view these features individually and combine them into meaningful further combinations as intended.

The figures show:

fig 1 shows a hand-held power tool according to the invention in a schematic view,

fig. 2 shows a pressing force characteristic curve and a rotational speed curve of a hand-held power tool according to the invention in a schematic representation,

fig. 3 shows a pressing force characteristic curve and a rotational speed curve of a hand-held power tool according to the invention in a schematic representation,

fig. 4 shows a pressing force characteristic curve and a rotational speed curve of a hand-held power tool according to the invention in a schematic representation, and

fig. 5 shows a torque characteristic diagram, a pressing force characteristic diagram and a standby switch state diagram or a motor switching unit state diagram of the hand-held power tool according to the invention in a schematic representation.

Detailed Description

Fig. 1 shows a hand-held power tool 10. The hand-held power tool 10 is designed as a chisel hammer. However, other configurations of the hand-held power tool 10 are also conceivable, which are considered appropriate by the person skilled in the art.

The hand-held power tool 10 comprises an operating unit 14. The hand-held power tool 10 comprises a tool unit 16.

The hand-held power tool 10 comprises a cover unit 12. The hand-held power tool 10 comprises a main handle housing 18, which in particular forms a main handle 32. The hand-held power tool 10 comprises an impact mechanism housing 26, which is provided in particular for receiving the impact mechanism 20.

The operating unit 14 is partly constituted by a main handle housing 18. The tool unit 16 is partially formed by an impact mechanism housing 26. The cover unit 12 is partially formed by a main handle housing 18. The cover unit 12 is partially formed by an impact mechanism housing 26. The cover unit 12 is at least substantially formed by the main handle housing 18 and the impact mechanism housing 26. The impact mechanism housing 26 is designed as an inner housing, in particular for the pneumatic impact mechanism 20, the electric motor 22 and the battery unit 36. The main handle housing 18 is designed as an outer housing, in particular for receiving the striking mechanism housing 26 in a supported manner.

The tool unit 16 is arranged on a front region 28 of the main handle housing 18. The main handle housing 18 is shaped on the end region 30 for forming a main handle 32, in particular for guiding the hand-held power tool 10 and for applying an operator force to the hand-held power tool 10.

The hand-held power tool 10 is embodied with a detachable additional handle 34. The additional handle 34 can be detachably fastened to the portable hand-held power tool 10 by means of a snap-on connection or other connections considered appropriate by the person skilled in the art. An additional handle 34 is arranged on the striking mechanism housing 26 for guiding the operator to the hand-held power tool 10.

The hand-held power tool 10 also has an electric motor 22. The hand-held power tool 10 has a transmission unit 24. Both the electric motor 22 and the transmission unit 24 are arranged in the cover unit 12. The electric motor 22 and the transmission unit 24 are both arranged in an impact mechanism housing 26. In particular, the electric motor 22 partially constitutes the tool unit 16. In particular, the transmission unit 24 partially forms the tool unit 16. The hand-held power tool 10 has a battery unit 36. The battery unit 36 is arranged in the impact mechanism housing 26. The accumulator unit 36 in particular partially forms the tool unit 16. The accumulator unit 36 is designed to supply the electric motor 22 with electrical energy. The accumulator unit 36 is arranged to be removable from the impact mechanism housing 26, for example by means of electrical plug contacts and/or snap-lock contacts. In particular, the impact mechanism housing 26 is removable from the main handle housing 18.

The hand-held power tool 10 has a tool receiver 38 for receiving a tool insert 40. The insertion tool 40 is configured as a chisel for example. The tool receiver 38 is arranged in the front region 28 of the hand-held power tool 10. The tool holder 38 is in particular designed as-a tool receiving portion. The tool receiving portion 38 can have any configuration deemed significant by one skilled in the art, such as a jaw chuck,-a Plus-tool receiving portion,Max — configuration of the tool receiver or the like.

The hand-held power tool 10 defines a longitudinal axis 42 from the main handle 32 to the tool interface 38, in particular along the tool longitudinal axis of the insertion tool 40 in the operating state.

A longitudinal axis 42 of the hand-held power tool 10 extends from the main grip housing 18 through the hand-held power tool 10 in the direction of the tool receiver 38. The longitudinal axis 42 extends at least substantially parallel to the rotational axis 44 of the hand-held power tool 10, in particular of the tool holder 38, preferably of the insertion tool 40, in particular if the hand-held power tool 10 is designed as a hammer drill. The axis of rotation 44 of the hand-held power tool 10, in particular the axis about which the tool receiver 38 can be rotated, in particular in at least one operating state, is in particular the case when the hand-held power tool 10 is designed as a drill hammer. The hand-held power tool 10 can have a built-in tool 40.

The hand-held power tool 10 comprises in particular at least one pneumatic percussion mechanism 20. The pneumatic impact mechanism 20 is at least largely disposed in the impact mechanism housing 26. The pneumatic impact mechanism 20 partially constitutes the tool unit 16. The tool receiving portion 38 partially constitutes the tool unit 16.

The pneumatic percussion mechanism 20 comprises in particular a hammer tube 46, in particular a guide tube. The hammer tube 46, in particular the guide tube, is not designed with a closable opening. The hammer tube 46, in particular the guide tube, is not designed with closable openings, in particular control openings or idle openings. In particular, the hammer tube 46 is configured without openings in the region between the piston 56 and the striker 58.

The maximum air spring pressure is in particular the maximum pressure in the hammer tube 46 that is reached during a percussion operation between the piston 56 and the striker 58. In particular, the piston 56 is moved so slowly during the impact mode that the maximum air spring pressure reaches a maximum of 1bar and activation of the impact mechanism is particularly avoided.

The pneumatic impact mechanism 20 includes an impact pin 48. The impact bolt 48 is mounted in the impact mechanism housing 26, in particular via bearings and/or a spring element 50, in a manner that is at least substantially immovable in an impact direction 52, in particular at least immovable relative to the hammer tube 46. The direction of impact 52 corresponds to the longitudinal axis 42.

The insertion tool 40 can be driven along the working axis 54, in particular by the electric motor 22 via the transmission unit 24 and/or the pneumatic percussion mechanism 20.

For generating and/or transmitting the impact pulses by the pneumatic impact mechanism 20, the hand-held power tool 10 has an electric motor 22 and a transmission unit 24.

The axis of movement 60 of the percussion element, in particular the piston 56, the percussion mechanism 58, the pneumatic percussion mechanism 20, extends parallel to the longitudinal axis 42 of the tool receiver 38, in particular parallel to the percussion direction 52 or parallel to the working axis 54. In principle, it is also conceivable that, by means of the transmission unit, the drive torque for generating a rotary motion of the tool receiver can be transmitted to the tool receiver by means of, for example, a hammer tube of a pneumatic percussion mechanism in a manner known to the person skilled in the art.

The hand-held power tool 10 has a bearing unit 62. The operating unit 14 is mounted so as to be linearly movable relative to the tool unit 16 via a bearing unit 62, preferably at least substantially parallel to the longitudinal axis 42, in particular parallel to the working axis 54. The bearing unit 62 has a spring unit 64 for providing elasticity for the bearing movement and the force transmission to the actuating unit 14, in particular during impact operation. The bearing unit 62 has, in particular, a restoring element which counteracts a movement of the tool unit 16 in the direction of the main handle 32 in order to reach the initial position again in the absence of an applied pressing force, in particular in the absence of a pressing force applied to the workpiece.

The hand-held power tool 10 can have a backup switch 68, which is shown in particular in fig. 1. The standby switch 68 is designed to switch the electric motor 22 into a standby state, in particular without rotational speed, or from a standby state, in particular without rotational speed, into a safety state. The standby state is a power supply state of the electric motor 22, in which the electric motor 22 is electrically connected to an energy source, in particular the accumulator unit 36. Alternatively or additionally, the standby state can be configured as a blocked state of the bearing unit 62, in particular of the relative movement of the tool unit 16 with respect to the operating unit 14. The standby switch 68 can be configured as a contact switch and/or a signal switch. The backup switch 68 can be arranged, in particular, outside the main handle housing 18 (shown in fig. 1). In principle, the backup switch 68 can also be arranged in other areas of the hand-held power tool 10 that are considered appropriate by the person skilled in the art.

The hand-held power tool 10 can have a display unit 70, in particular a light and/or acoustic unit, for visually and/or audibly displaying the standby state. The display unit 70 is arranged in particular outside the main handle housing 18 or the percussion mechanism housing 26, in particular in the vicinity of the tool receiver 38.

The hand-held power tool 10 has a motor switching unit 66. The motor switching unit 66 is designed to sense a pressing force characteristic variable between the tool unit 16 and the operating unit 14.

The motor switching unit 66 has two actuating elements 72, in particular and/or two switching elements 74, which are completely covered by the covering unit 12. The actuating element 72, in particular the two switching elements 74, is designed to sense a characteristic variable of the contact pressure between the tool unit 16 and the operating unit 14. The actuating element 72, in particular the two switching elements 74, is arranged in the vicinity of the bearing unit 62. The actuating element 72, in particular the two switching elements 74, is designed as a sensor element.

The actuating element 72 is, for example, designed as an optical sensor element, which is designed to sense a movement of the impact mechanism housing 26 relative to the main grip housing 18 as a pressing force characteristic variable. In particular, the movement of the impact mechanism housing 26 relative to the main handle housing 18 is directly proportional to the compressive force that the user can apply to the embedded tool 40 through the main handle 32 and/or the additional grip 34. In particular, the optional shift element 74 is designed to be dependent on a pressing force characteristic variable. In particular, the optional switching element 74 can be designed as a piezoelectric sensor in order to sense the contact pressure as a characteristic variable of the contact pressure, which contact pressure (andruck) is in particular directly proportional to the contact pressure (andrackraft). In particular, the actuating element 72, in particular the actuating element and/or the switching element 74, can be designed for sensing a torque at the tool receiver 38, in particular by power consumption, in particular the current intensity, at the electric motor 22. The actuating element 72 can be arranged, for example, on the bearing unit 62, in particular for sensing a movement of a part of the bearing unit 62.

Furthermore, the motor switching unit 66 is designed to switch the electric motor 22 at least partially as a function of the pressing force characteristic variable.

The motor switching unit 66 has at least one further switching element 76, which is designed to be associated with the pressing force characteristic variable and is designed to control and/or regulate the motor speed of the electric motor 22. The further shift element 76 is designed to control and/or regulate the motor speed of the electric motor 22 in at least one speed range.

Fig. 2 shows a graph of the pressing force characteristic of the electric motor 22, in particular the upper graph, and a corresponding graph of the rotational speed achieved by the motor switching unit 66, in particular the lower graph.

Time is plotted on the abscissa 78 of the graph. The pressing force characteristic variable, in particular the stroke of the relative movement, is plotted on the ordinate 80 of the pressing force characteristic variable diagram. The rotational speed of the electric motor 22 is plotted on the ordinate 90 of the rotational speed diagram.

The motor switching unit 66 is designed to switch the electric motor 22 on the basis of the sensed pressing force characteristic variable, in particular to switch the rotational speed of the electric motor 22 to a rotational speed different from zero, in particular to an operating rotational speed 86. The motor switching unit 66 is designed to switch the electric motor 22 on, in particular to switch the rotational speed of the electric motor 22 to an operating rotational speed 86 (see the diagram in fig. 2) which is different from zero, if the sensed pressing force characteristic exceeds a threshold value, in particular an on threshold value 82. In this example, if the switch-on threshold 82 is exceeded, the motor switching unit 66 switches the rotational speed of the electric motor 22 to a constant operating rotational speed 86, for example a maximum possible rotational speed, which is different from zero, independently of a further change in the sensed contact pressure characteristic variable.

The motor switching unit 66 is designed to assign the activation state 92 of the electric motor 22 to a measurement range of the contact pressure characteristic variable. In particular, the motor switching unit 66 assigns the activation state 92 of the electric motor 22 to a measurement range of the contact pressure characteristic variable above the switch-on threshold 82.

The motor switching unit 66 is designed to switch off the electric motor 22, in particular to switch the rotational speed of the electric motor 22 to a zero rotational speed 88 (see the diagram in fig. 2), if the sensed contact pressure characteristic quantity is below a threshold value, in particular a switch-off threshold value 84. In particular, the switching-on threshold 82 and the switching-off threshold 84 are identical in this example.

The motor switching unit 66 is designed to reduce the motor speed of the electric motor 22, in particular to a standstill, on the basis of the sensed pressing force characteristic variable.

The motor switching unit 66 is designed to reduce the motor speed of the electric motor 22 on the basis of the sensed pressing force characteristic such that activation of the impact mechanism is avoided.

The motor switching unit 66 can be configured for passively braking the electric motor 22. The motor switching unit 66 is designed to actively brake the electric motor 22, in particular to brake the electric motor so quickly that activation of the impact mechanism is avoided.

Fig. 3 shows a further pressing force characteristic variable diagram of the electric motor 22, in particular the upper diagram, and a corresponding rotational speed diagram, in particular the lower diagram, achieved by the motor switching unit 66.

Time is plotted on the abscissa 78 of the graph. The pressing force characteristic variable, in particular the stroke of the relative movement, is plotted on the ordinate 94 of the pressing force characteristic variable diagram. The rotational speed of the electric motor 22 is plotted on the ordinate 96 of the rotational speed diagram.

The motor switching unit 66 is designed to switch the electric motor 22 on, in particular to switch the rotational speed of the electric motor 22 to an operating rotational speed 86 (see the diagram in fig. 2) which is different from zero, if the sensed pressing force characteristic exceeds a threshold value, in particular a switch-on threshold value 82. In this example, if the switch-on threshold 82 is exceeded, the motor switching unit 66 switches the rotational speed of the electric motor 22 to a constant operating rotational speed 86, for example a maximum possible rotational speed, which is different from zero, independently of a further change in the sensed contact pressure characteristic variable. The motor switching unit 66 is designed to assign the activation state 92 of the electric motor 22 to a measurement range of the contact pressure characteristic variable. In particular, the motor switching unit 66 assigns the activation state 92 of the electric motor 22 to a measurement range of the contact pressure characteristic variable from the first exceeding of the switch-on threshold 82 to a value below the actual switch-off value 100. After a defined period 98, the actual shut-off value 100 of the contact force characteristic does not necessarily equal the shut-off threshold 84. The actual shut-off value 100 is distinguished by a pressing-force characteristic parameter difference 102 which differs from zero.

The motor switching unit 66 is designed to switch the electric motor 22 at least partially in a time-dependent manner. The motor switching unit 66 is designed to switch off the electric motor 22, in particular to switch the rotational speed of the electric motor 22 to a zero rotational speed 88 (see the diagram in fig. 2), after a defined period of time 98 if the sensed contact pressure characteristic quantity is below a threshold value, in particular the switching-off threshold value 84. In particular, the switching-on threshold 82 and the switching-off threshold 84 are identical in this example.

Fig. 4 also shows a further pressing force characteristic variable diagram of the electric motor 22, in particular the upper diagram, and a corresponding rotational speed diagram, in particular the lower diagram, reached by the motor switching unit 66.

Time is plotted on the abscissa 78 of the graph. The pressing force characteristic variable, in particular the stroke of the relative movement, is plotted on the ordinate 104 of the pressing force characteristic variable diagram. The rotational speed of the electric motor 22 is plotted on the ordinate 106 of the rotational speed diagram.

The motor switching unit 66 is designed to switch the electric motor 22 on after a defined period of time 108 when the sensed pressing force characteristic exceeds a threshold value, in particular the switch-on threshold value 82, in particular to switch the rotational speed of the electric motor 22 to a variable operating rotational speed 114 (see the diagram in fig. 4) which is different from zero.

After a defined period 108, the actual switch-on value 110 of the contact force characteristic variable is not necessarily equal to the switch-on threshold 82. For example, the actual switch-on value 110 differs by a pressing force characteristic variable difference 112 differing from zero.

In this example, above the switch-on threshold 82, the motor switching unit 66 switches the rotational speed of the electric motor 22 to a different, varying operating rotational speed 114, which is different from zero, in dependence on a further variation of the sensed contact pressure characteristic variable.

During the time period 124, the motor switching unit 66 switches the rotational speed of the electric motor 22 in a linearly increasing manner to the intermediate rotational speed 120 as a function of the sensed, linearly increasing pressing force characteristic variable.

During time period 124, motor switching unit 66 senses a linearly rising pressing force characteristic which rises to intermediate pressing force characteristic 118.

During the time period 126, the motor switching unit 66 switches the rotational speed of the electric motor 22 in a linearly increasing manner to the maximum rotational speed 122 in the active state 92 as a function of the sensed, linearly increasing contact pressure characteristic variable. The maximum rotational speed 122 does not necessarily have to correspond to the maximum possible rotational speed of the electric motor 22, but can also correspond thereto.

During time period 126, motor switching unit 66 senses a linearly rising pressing force characteristic which rises to maximum pressing force characteristic 116.

During the time period 128, the motor switching unit 66 switches the rotational speed of the electric motor 22 in a linearly decreasing manner as a function of the sensed pressing force characteristic which decreases linearly until it falls below the switch-off threshold 84. In particular, the shut-off threshold value 84 is configured in relation to a maximum value of the pressing force characteristic variable, in particular in relation to the maximum pressing force characteristic variable 116, for example in percentage terms, for example, in particular approximately 75% of this maximum value. In this way, the turn-off limit value can be above the turn-on limit value.

The motor switching unit 66 is designed to switch off the electric motor 22, in particular to switch the rotational speed of the electric motor 22 to a zero rotational speed 88 (see the diagram in fig. 2), if the sensed contact pressure characteristic quantity is below a threshold value, in particular a switch-off threshold value 84.

The motor switching unit 66 is designed to assign the activation state 92 of the electric motor 22 to a measurement range of the contact pressure characteristic variable. In particular, the motor switching unit 66 assigns the activation state 92 of the electric motor 22 to a measurement range of the contact pressure characteristic variable from the first exceeding of the actual switch-on value 110 to a value below the switch-off threshold 84. In particular, the motor switching unit 66 assigns the activation state 92 of the electric motor 22 to a measurement range of the contact pressure characteristic variable from a first exceeding of the switching-on threshold 82, in particular the actual switching-on value 110, to a falling below the switching-off threshold 84, in particular the actual switching-off value 100.

In particular, the switching-on threshold 82 and the switching-off threshold 84 are not identical in this example.

Fig. 5 shows a torque characteristic curve (upper curve), a pressing force characteristic curve (middle curve) and a standby switch state curve or a motor switching unit curve (lower curve).

The motor switching unit 66 is configured in this example for switching the electric motor 22 at least partially in dependence on the torque.

Time is plotted on the abscissa 130 of the graph. The torque characteristic variable, in particular the current level, is plotted on the ordinate 132 of the torque characteristic variable diagram. The pressing force characteristic variable is plotted on the ordinate 134 of the pressing force characteristic variable diagram. The switching state, in particular the on state 140 or the off state 142, is plotted on the ordinate 136 of the standby switching state diagram or of the motor switching unit diagram.

During the time period 138, the standby switch 68 or the motor switching unit 66, in particular the switching element 74 of the motor switching unit 66, is in the on state 140. Outside of time period 138, backup switch 68 or motor switching unit 66, in particular switching element 74 of motor switching unit 66, is in off state 142.

During the time period 144, a pressing force characteristic parameter value 146 different from zero is sensed by the motor switching unit 66. During time period 154, zero compression force characteristic 148 is sensed by motor switching unit 66.

During the time period 150, a torque characteristic variable, in particular a current consumption, in particular a torque characteristic variable value 158, which is different from zero, in particular belongs to the working load torque, is sensed on the tool receiver 38, in particular on the electric motor 22, in particular as a current intensity, which corresponds to the contact force characteristic variable value 146, in particular to the working state of the hand-held power tool 10 on the workpiece.

During the time period 152, a torque characteristic variable, in particular the current consumption, in particular as the current intensity, at the tool receiver 38, in particular at the electric motor 22, falls to a torque characteristic variable value 156, in particular a drill cuttings conveyance torque, which corresponds to the contact pressure characteristic variable 146, in particular to the operating state of the hand-held power tool 10 on the workpiece.

During the time period 160, a torque characteristic variable, in particular a current consumption, in particular as a current intensity, which is different from zero, in particular a torque characteristic variable value 156, which belongs to the working load torque, is sensed at the tool receiver 38, in particular at the electric motor 22, and which corresponds to the zero-clamping-force characteristic variable value 148, in particular to the operating state of the hand-held power tool 10 on the workpiece.

During the time period 162, a torque characteristic variable, in particular a current consumption, in particular a current intensity, at the tool receiver 38, in particular at the electric motor 22, falls to a zero torque characteristic variable value 164, in particular of the unloaded hand-held power tool 10, which corresponds to the zero compression force characteristic variable 148, in particular to the switched-off state of the hand-held power tool 10 or to the operating state of the hand-held power tool 10 without load caused by workpieces or drill cuttings.

During time period 162, the torque characteristic reaches below a torque characteristic threshold value 166. The motor switching unit 66 is provided for braking the electric motor 22 to a zero rotational speed 88 when the torque characteristic threshold value 166 is undershot. The backup switch 68 can be provided for switching into the off state 142 and in particular for interrupting the current supply to the electric motor 22 when the torque characteristic threshold value 166 is undershot. In particular, the motor switching unit 66 and the backup switch 68 can be mechanically and/or electrically connected.

In particular, the hand-held power tool 10 can have a construction without a percussion mechanism control device. In particular, the pneumatic percussion mechanism 20 can be controlled by a motor switching unit 66.

The on state 140 of the standby switch 68 is particularly the standby state. The off state 142 of the backup switch 68 is particularly a safe state.