阅读说明：本技术 一种往复式动力工具 (Reciprocating type power tool ) 是由 王金城 林国军 王伟国 黄向进 刘庆 俞宏帅 郑捷 叶俊林 水远辉 于 2019-11-08 设计创作，主要内容包括：本发明提供的一种往复式动力工具,包括电机、电机轴齿和固定支座,还包括第一定位轴和第二定位轴,其中,第一定位轴上设有具有第一和第二配重块的第一齿轮和具有第三配重块的第二齿轮,且第一齿轮与第二齿轮的旋向相反,第二定位轴上设有与第二齿轮配合的第三齿轮。本发明提供的一种往复式动力工具,不仅结构更紧凑轻巧,还可以有效减少振动与冲击,提高了操作者的使用舒适度和机构的使用寿命。(The invention provides a reciprocating power tool, which comprises a motor, motor shaft teeth, a fixed support, a first positioning shaft and a second positioning shaft, wherein the first positioning shaft is provided with a first gear with a first balancing weight and a second gear with a third balancing weight, the rotation directions of the first gear and the second gear are opposite, and the second positioning shaft is provided with a third gear matched with the second gear. The reciprocating power tool provided by the invention has a more compact and light structure, can effectively reduce vibration and impact, and improves the use comfort of an operator and the service life of the mechanism.)

1. The utility model provides a reciprocating type power tool, includes the motor and connects motor shaft tooth and fixing support on the motor output, its characterized in that: a first positioning shaft parallel to the motor shaft teeth is arranged on the fixed support, a first gear matched with the motor shaft teeth and a second gear opposite to the rotation direction of the first gear are arranged on the first positioning shaft, a second balancing weight and a first balancing weight are respectively and fixedly arranged on the upper end surface and the lower end surface of the first gear, and a third balancing weight is fixedly arranged on the lower end surface, close to the first gear, of the second gear; a second positioning shaft parallel to the motor shaft teeth is arranged on the fixed support, a third gear matched with the motor shaft teeth is arranged on the second positioning shaft, and the third gear is matched with the second gear and drives the second gear to rotate; an eccentric wheel is arranged on the upper end face of the second gear, a pin shaft is fixed on the eccentric wheel and connected with a reciprocating rod, and the second gear drives the reciprocating rod to reciprocate in a rotating mode.

2. A reciprocating power tool as claimed in claim 1, wherein: the second balancing weight and the first balancing weight are fixed at the same position of the axial projection of the first gear.

3. A reciprocating power tool as claimed in claim 2, wherein: the first gear is provided with a first boss at one end close to the fixed support, and the height of the first boss is the same as that of the first balancing weight.

4. A reciprocating power tool as claimed in claim 3, wherein: and a second boss is arranged at one end of the second gear, which is close to the first gear, and the height of the second boss is the same as the sum of the heights of the second counterweight block and the third counterweight block.

5. A reciprocating power tool as claimed in claim 1, wherein: the second positioning shaft is close to one end, far away from the output end, of the reciprocating rod.

6. The reciprocating power tool of claim 5, wherein: the first gear and the third gear are respectively positioned on two sides of the motor shaft tooth, the lower end of the motor shaft tooth close to the motor body is meshed with the first gear, and the upper end of the motor shaft tooth is meshed with the third gear.

7. A reciprocating power tool as claimed in claim 1, wherein: the end of the reciprocating rod is provided with a guide rail, the lower end of the guide rail close to the motor is fixedly provided with a bearing, the bearing is pressed against the eccentric wheel, and the matching surface of the eccentric wheel and the bearing is an inclined surface.

8. A reciprocating power tool as claimed in claim 7, wherein: and a spring is further arranged at the upper end of the guide rail, which is far away from the motor, and the other end of the spring is abutted against the shell of the reciprocating power tool.

Technical Field

The invention relates to the technical field of electric tools, in particular to a reciprocating power tool.

Background

Reciprocating-type motion mechanisms find application in many mechanical products, such as reciprocating saws. In the machines, the reciprocating motion of a working mechanism can generate larger inertia force, and if the inertia force cannot be effectively eliminated in the operation of the mechanism, the whole mechanism generates an unbalanced force, so that vibration and impact are brought to the machine, and the use comfort of an operator and the service life of the mechanism are seriously influenced.

At present, in general reciprocating motion products, structures generating opposite inertia forces are designed in the reciprocating direction of a mechanism, so that unbalance generated by the inertia forces is weakened to a certain extent, but the structures generate new inertia forces in other directions to bring new unbalance forces, and great influence also exists.

Disclosure of Invention

The invention provides a reciprocating power tool which can effectively reduce vibration and impact, improve the use comfort of an operator and prolong the service life of a mechanism.

In order to achieve the above object, according to an aspect of the present invention, there is provided a transmission device of a hand-held power tool, a reciprocating power tool, comprising a motor, a motor shaft tooth connected to an output end of the motor, and a fixed support, wherein the fixed support is provided with a first positioning shaft parallel to the motor shaft tooth, the first positioning shaft is provided with a first gear engaged with the motor shaft tooth and a second gear having a rotation direction opposite to that of the first gear, an upper end surface and a lower end surface of the first gear are respectively and fixedly provided with a second weight block and a first weight block, and the second gear is fixedly provided with a third weight block at a lower end surface close to the first gear; a second positioning shaft parallel to the motor shaft teeth is arranged on the fixed support, a third gear matched with the motor shaft teeth is arranged on the second positioning shaft, and the third gear is matched with the second gear and drives the second gear to rotate; an eccentric wheel is arranged on the upper end face of the second gear, a pin shaft is fixed on the eccentric wheel and connected with a reciprocating rod, and the second gear drives the reciprocating rod to reciprocate in a rotating mode.

In a further aspect of the present invention, the second weight member and the first weight member are fixed to a same position of an axial projection of the first gear.

In a further aspect of the present invention, a first boss is disposed at one end of the first gear near the fixed support, and the height of the first boss is the same as the height of the first counterweight.

In a further aspect of the present invention, a second boss is disposed at an end of the second gear close to the first gear, and a height of the second boss is the same as a sum of heights of the second counterweight block and the third counterweight block.

In a further aspect of the present invention, the second positioning shaft is close to an end of the reciprocating rod away from the output end.

In a further aspect of the present invention, the first gear and the third gear are respectively located on two sides of the motor shaft tooth, and the motor shaft tooth is engaged with the first gear near the lower end of the motor body, and the upper end of the motor shaft tooth is engaged with the third gear.

In a further aspect of the present invention, a guide rail is disposed at the end of the reciprocating rod, a bearing is fixedly disposed at the lower end of the guide rail close to the motor, the bearing is pressed against the eccentric wheel, and a fitting surface between the eccentric wheel and the bearing is an inclined surface.

In a further scheme of the invention, a spring is arranged at the upper end of the guide rail far away from the motor, and the other end of the spring is abutted against the shell of the reciprocating power tool.

The technical scheme adopted by the invention has the following beneficial effects:

1. the reciprocating power tool changes the traditional design, and the upper end surface and the lower end surface of the first gear are respectively provided with the balancing weight, so that the overlong gear shaft of the motor can be avoided, and the reciprocating power tool is more compact and lighter in structure.

2. The inertial force generated by the counter weight blocks in the motion process can be mutually offset or weakened with the inertial force generated by the weight of the reciprocating rod in the reciprocating motion direction, and the inertial forces generated by the counter weight blocks on the two gears in other directions can be mutually offset, so that the resultant force of the inertia generated by the whole mechanism in each direction is zero or smaller, and the vibration and the impact are reduced.

3. The gear is provided with the boss which can be matched with the balancing weight, and the gear and the balancing weight have the same height, so that the gear is convenient to process and produce, and the cost is saved.

4. The outer ring of the end face of the eccentric wheel is designed to be an inclined plane, the inclined plane is in contact with the outer ring of the rolling bearing, and the guide rail vertically moves up and down under the action of the spring along with the rotation of the gear to drive the end part of the reciprocating rod to swing up and down, so that effective cutting can be realized.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a reciprocating power tool of the present invention.

Figure 2 is a partial exploded view of a reciprocating power tool of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper," "lower," "front," "rear," and the like, which indicate orientation or positional relationship, are based only on the orientation or positional relationship shown in the drawings and are merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation and, therefore, should not be taken as limiting the present invention.

Referring to fig. 1 to 2, a reciprocating power tool includes a motor 1 and motor shaft teeth 18 connected to an output end of the motor. The output end of the motor 1 is fixedly provided with a fixed support 2, the fixed support 2 is provided with a first positioning shaft 19 and a second positioning shaft 20 which are axially parallel to the motor shaft teeth 18, the first positioning shaft 19 is provided with a first gear 3 matched with the motor shaft teeth 18 and a second gear 4 which is opposite to the first gear 3 in rotation direction, the first gear is preferably right-handed, the second gear is left-handed, and other gear designs can be adopted by technical personnel in the field.

The first gear wheel 3 is provided with a first cam 21 at an end adjacent to the fixed support 2, which is coaxial with the first gear wheel 3 and extends cylindrically outwards. A first balancing weight 17 is arranged between the outer contour edge of the first boss 21 and the outer contour edge of the first gear 3, the first balancing weight 17 is fixedly connected to the first gear 3, and the axial length of the first balancing weight 17 is equal to the axial length of the first boss 21. The first gear 3 is provided with a second weight block 16 on the upper end face far away from the motor 1, and the second weight block 16 and the first weight block 17 are fixed on the same position of the first gear 3, namely the second weight block 16 and the first weight block 17 are overlapped in the axial projection.

The second gear 4 is provided with a second boss 22 at an end close to the first gear 3, and the second boss is coaxial with the second gear 4 and extends in a cylindrical shape towards the first gear 3. A third balancing weight 14 is arranged between the outer contour edge of the second boss 22 and the outer contour edge of the second gear 4, the third balancing weight 14 is fixedly connected to the second gear 4, and the axial length of the third balancing weight 14 is equal to the sum of the heights of the second balancing weight 16 and the third balancing weight 14.

A second positioning shaft 20 is located near the end of the reciprocating lever 6 remote from the output end. The second positioning shaft 20 is provided with a third gear 15, the third gear 15 and the first gear 3 are respectively positioned at two sides of the motor shaft tooth 18, wherein the lower end of the motor shaft tooth 18 close to the motor 1 body is meshed with the first gear 3, and the upper end of the motor shaft tooth 18 is meshed with the third gear 15. The third gear 15 also cooperates with the second gear 4 and drives the second gear 4 in rotation.

An eccentric wheel 5 is arranged on the upper end face of the second gear 4, a pin shaft 8 is fixed on the eccentric wheel 5, the pin shaft 8 is connected with a reciprocating rod 6, and the second gear 4 drives the reciprocating rod 6 to reciprocate in a rotating mode.

The reciprocating rod 6 is supported by two guide rails, wherein a spring 12 is arranged at the upper end, far away from the motor 1, of the guide rail 7 arranged at the tail end of the reciprocating rod 6, and a bearing 11 is arranged at the lower end, close to the motor 1, of the guide rail 7. One end of the spring 12 abuts against the guide rail 7 and the other end abuts against the housing of the reciprocating power tool. The bearing 11 is fixed on the guide rail 7 through the rod 10, the other side of the bearing is pressed against the eccentric wheel 5, and the matching surface of the eccentric wheel 5 and the bearing 11 is an inclined surface, so that along with the rotation of the second gear 4, under the action of the spring 12, the guide rail 7 vertically moves up and down to drive the end part of the reciprocating rod 6 to swing up and down.

As the motor shaft teeth 18 rotate, the first gear 3 and the third gear 15 are driven to rotate in the same direction, while the third gear 15 drives the second gear 4 to rotate in the opposite direction to the first gear 3. The second gear 4 rotates to drive the eccentric wheel 5 to rotate, a pin shaft 8 on the eccentric wheel 5 is sleeved with a rolling bearing, the bearing is placed in a guide wheel groove, the guide wheel groove is fixedly connected to the reciprocating rod 6, and the guide wheel groove and the reciprocating rod 6 are driven to reciprocate together through the bearing when the second gear 4 moves circumferentially. The first gear and the second gear are both provided with balancing weights, and the balancing weights move along with the gears, the inertia force generated by the balancing weights when the balancing weights move can be mutually offset or weakened with the inertia force generated by the weight of the reciprocating rod in the reciprocating direction, and the inertia forces generated by the balancing weights on the two gears in other directions can be mutually offset, so that the resultant force of inertia generated by the whole mechanism in each direction is zero or smaller, and the vibration and the impact are reduced.

According to the reciprocating power tool, the upper end face and the lower end face of the first gear are respectively provided with the balancing weights, so that the overlong gear shaft of the motor can be avoided, and the reciprocating power tool is more compact and lighter in structure; the gear provided with the boss can be matched with the balancing weight, and the gear and the balancing weight have the same height, so that the gear is convenient to process and produce, and the cost is saved; the outer ring of the end face of the eccentric wheel is designed to be an inclined plane, the inclined plane is in contact with the outer ring of the rolling bearing, and the guide rail vertically moves up and down under the action of the spring along with the rotation of the gear to drive the end part of the reciprocating rod to swing up and down, so that effective cutting can be realized.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.