阅读说明：本技术 一种汽车助力装置 (Automobile power assisting device ) 是由 王式民 刘畅 杨涛涛 于 2021-10-20 设计创作，主要内容包括：本发明公开了一种汽车助力装置,其用于为汽车转向系统的转向助力,包括壳体,壳体内设置有相啮合的蜗轮与蜗杆,蜗杆的端部通过轴承连接于壳体上,还包括主动调节机构,主动调节机构包括控制器、压力传感器、挤压件、控制弹簧、调节件以及驱动组件,蜗杆、挤压件、控制弹簧、调节件以及驱动组件依次传动连接；压力传感器用于检测蜗杆与涡轮间的挤压力数值,控制器根据挤压力数值控制驱动组件驱动调节件。本发明提供的汽车助力装置,通过压力传感器检测蜗杆与涡轮间的挤压力,对蜗杆与涡轮间的挤压力的调节就可以控制两者之间的间隙过大,如此可以主动的控制蜗杆与涡轮间的挤压力处于基本恒定的状态。(The invention discloses an automobile power assisting device which is used for assisting the steering of an automobile steering system and comprises a shell, wherein a worm wheel and a worm which are meshed with each other are arranged in the shell, the end part of the worm is connected to the shell through a bearing, the automobile power assisting device also comprises an active adjusting mechanism, the active adjusting mechanism comprises a controller, a pressure sensor, an extrusion piece, a control spring, an adjusting piece and a driving assembly, and the worm, the extrusion piece, the control spring, the adjusting piece and the driving assembly are sequentially in transmission connection; the pressure sensor is used for detecting the extrusion force value between the worm and the turbine, and the controller controls the driving assembly to drive the adjusting part according to the extrusion force value. The automobile power assisting device provided by the invention has the advantages that the extrusion force between the worm and the turbine is detected through the pressure sensor, the overlarge gap between the worm and the turbine can be controlled by adjusting the extrusion force between the worm and the turbine, and thus, the extrusion force between the worm and the turbine can be actively controlled to be in a basically constant state.)

1. The automobile power assisting device is used for assisting the steering of an automobile steering system and is characterized by comprising a shell, wherein a worm wheel and a worm which are meshed with each other are arranged in the shell, the end part of the worm is connected to the shell through a bearing, the automobile power assisting device also comprises an active adjusting mechanism, the active adjusting mechanism comprises a controller, a pressure sensor, an extrusion piece, a control spring, an adjusting piece and a driving assembly, and the worm, the extrusion piece, the control spring, the adjusting piece and the driving assembly are sequentially in transmission connection;

the pressure sensor is used for detecting the extrusion force value between the worm and the turbine, and the controller controls the driving assembly to drive the adjusting piece according to the extrusion force value.

2. The vehicle power assisting device of claim 1, wherein the controller is a control chip of the vehicle power assisting system or a main control chip of a vehicle.

3. The booster of claim 1, wherein the pressure sensor detects, as the value of the pressing force between the worm and the worm wheel, a value of the pressing force of any adjacent two of the worm wheel, the worm, the pressing member, the control spring, the adjusting member, and the drive assembly.

4. The vehicle power assist device according to claim 1, wherein the pressure sensor detects a magnitude of deformation of the control spring to convert to obtain the value of the pressing force.

5. The vehicle assist device of claim 1, wherein the adjustment member is threaded to the housing, and the drive assembly drives the adjustment member to rotate to compress the control spring.

6. The vehicle assist of claim 1, wherein the drive assembly is an electric drive assembly or a hydraulic drive assembly.

7. The vehicle assist of claim 1, wherein the drive assembly is movably coupled to the housing, the drive assembly having an escape position and a transmission position on a travel path in which a moving member on the vehicle drives the adjustment member via the drive assembly.

8. The vehicle assist device of claim 7, wherein the moving member is a steering column or a reduction gear of a steering system of the vehicle.

9. The vehicle assist of claim 8, wherein the moving member is a steering column of a vehicle steering system, and wherein in the transmission position, an end of a rotational travel of the steering column compresses the drive assembly to drive the adjustment member.

10. The vehicle power assisting device of claim 7, wherein the driving component is an electromagnet and a magnetic attraction piece, and the electromagnet is opened and closed to control the magnetic attraction piece to switch between the avoiding position and the transmission position.

Technical Field

The invention relates to an automobile steering power assisting technology, in particular to an automobile power assisting device.

Background

Currently, power steering systems are already standard for automobile steering devices, and power steering systems in the prior art include mechanical hydraulic power steering systems, electronic hydraulic power steering systems, electric power steering systems, and the like, wherein electric power steering systems are increasingly used due to compact structure, good direction, high speed stability, energy saving, and the like.

Most commonly, the electric power steering system uses a worm gear as a core speed reduction transmission mechanism, so that the matching performance of the worm gear directly determines the hand feeling and the performance of the electric power steering, and after long-term use, the clearance between the worm gear and the worm gear is increased due to abrasion and the like, so that the hand feeling is poor, and the noise is increased. In order to solve the problem, some high-end vehicle models begin to release an electric power assisting system with clearance compensation, and the principle is as follows: the worm is extruded by an elastic extrusion mechanism, so that the worm is driven by the extrusion of the elastic extrusion mechanism after the clearance between the worm and the worm wheel is enlarged, and the clearance between the worm and the worm wheel is kept smaller than a preset value. For example, the invention patent with publication number CN107985394B, publication date 20210101, entitled "clearance compensation mechanism for speed reduction mechanism of electric power steering system", includes a speed reduction box body, and a worm wheel and a worm engaged with each other, where the clearance compensation mechanism includes a first bearing sleeved on the worm, a tolerance compensation ring sleeved on the first bearing, and a jackscrew assembly for providing elastic supporting force to the worm. Tolerance compensation ring includes outer support ring, sets up in the inside of outer support ring interior support ring circle, with outer support ring and interior support ring connection's connecting block, set up on outer support ring and be used for providing the first supporting shoe of supporting role to interior support ring in the first direction and set up on outer support ring and be used for playing limiting displacement's second supporting shoe to interior support ring in the second direction, the first direction with the axis of worm wheel parallels, and interior support ring has lets first bearing male centre bore. For example, the invention patent application with application publication number CN102765418B adopts the above working principle, that is, an elastic extrusion mechanism is used to abut against the worm, and when the gap between the worm and the worm wheel becomes larger, the elastic extrusion mechanism deforms to drive the worm to approach the worm wheel, thereby reducing the gap.

Obviously, the prior art better solves the problem that the gap between the worm and the gear becomes larger, but the solution method depends on the deformation of a compressed elastic extrusion mechanism such as a spring, an elastic sheet and the like for supplement, which brings the following problems that firstly, the elastic force provided by the elastic extrusion mechanism under different deformation amplitudes is different, which actually causes the extrusion force between the worm and the gear to be changed, and the different extrusion force further causes the problem of aggravation of abrasion; secondly, the elastic pressing mechanism, such as the elastic sheet, reaches the vicinity of the deformation limit capability due to the large deformation amplitude or material aging, and the gap compensation capability thereof is greatly reduced. The prior art also attempted to solve the problem, such as CN107985394B, in which the spring is pressed by the rotation of the screw rod, so as to control the deformation amplitude of the spring, but the adjustment method completely depends on blind measurement, and has no quantitative parameter control and guidance, so as to be rather boring.

Disclosure of Invention

The invention aims to provide an automobile power assisting device to overcome the defects in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme:

an automobile power assisting device is used for assisting the steering of an automobile steering system and comprises a shell, wherein a worm wheel and a worm which are meshed with each other are arranged in the shell, the end part of the worm is connected to the shell through a bearing, the automobile power assisting device also comprises an active adjusting mechanism, the active adjusting mechanism comprises a controller, a pressure sensor, an extrusion piece, a control spring, an adjusting piece and a driving assembly, and the worm, the extrusion piece, the control spring, the adjusting piece and the driving assembly are sequentially in transmission connection;

the pressure sensor is used for detecting the extrusion force value between the worm and the turbine, and the controller controls the driving assembly to drive the adjusting piece according to the extrusion force value.

In the above power assisting device for an automobile, the controller is a control chip of the power assisting system or a main control chip of the automobile.

In the automobile power assisting device, the pressure sensor detects the extrusion force values of any adjacent two of the worm wheel, the worm, the extrusion piece, the control spring, the adjusting piece and the driving assembly as the extrusion force value between the worm wheel and the worm wheel.

In the above power assist device for a vehicle, the pressure sensor detects the deformation amplitude of the control spring to convert and obtain the extrusion force value.

In the automobile power assisting device, the adjusting piece is screwed on the shell, and the driving assembly drives the adjusting piece to rotate so as to extrude the control spring.

In the above power assisting device for an automobile, the driving component is an electric driving component or a hydraulic driving component.

In the above power assisting device for the automobile, the driving assembly is movably connected to the housing, the driving assembly has an avoiding position and a transmission position on a movable stroke, and a moving part on the automobile drives the adjusting part through the driving assembly on the transmission position.

In the above power assisting device for an automobile, the moving part is a steering column or a speed reducing mechanism of an automobile steering system.

In the above power assisting device, the moving element is a steering column of a steering system of an automobile, and in the transmission position, the end of the rotation stroke of the steering column presses the driving assembly to drive the adjusting element.

In the automobile power assisting device, the driving assembly is the electromagnet and the magnetic attraction piece, and the electromagnet is opened and closed to control the magnetic attraction piece to switch between the avoiding position and the transmission position.

In the technical scheme, the automobile power assisting device provided by the invention has the advantages that the extrusion force between the worm and the worm wheel is detected through the pressure sensor, the pressure between the worm wheel and the worm wheel is actively adjusted through the driving assembly based on the detection, the adjustment of the extrusion force between the worm and the worm wheel can control the overlarge gap between the worm and the worm wheel, and thus the extrusion force between the worm and the worm wheel can be actively controlled to be in a basically constant state.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic structural diagram of an automotive power assisting device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a portion of an active adjustment mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of an extrusion provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a driving assembly according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a turntable and a ratchet plate according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a turntable and a ratchet plate according to another embodiment of the present invention;

FIG. 7 is a top view of a turntable and a ratchet plate according to yet another embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a driving assembly according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a driving assembly according to another embodiment of the present invention;

fig. 10 is a schematic diagram of the operation of the rolling ball body provided by the embodiment of the invention.

Description of reference numerals:

1. a worm gear; 2. a worm; 3. a steering column; 3.1, driving wing plates; 4. a bearing; 5. an extrusion; 5.1, extruding a rod; 5.2, abutting the ball; 6. a control spring; 7. an adjustment member; 8. a drive assembly; 8.1, an electromagnet; 8.2, a magnetic attraction structure; 8.3, a turntable; 8.4, a ratchet disc; 8.5, a driving rod; 8.6, an active pawl; 8.7, reverse pawl; 8.8, a cylinder body; 8.9, a transmission column; 8.10, a rolling sphere; 9. a cross bar; 10. a lever; 11. a housing.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 10, an automobile power assisting device provided in an embodiment of the present invention is used for assisting steering of an automobile steering system, and includes a housing 11, a worm wheel 1 and a worm 2 engaged with each other are disposed in the housing 11, an end of the worm 2 is connected to the housing 11 through a bearing 4, and the automobile power assisting device further includes an active adjusting mechanism, the active adjusting mechanism includes a controller, a pressure sensor, an extrusion member 5, a control spring 6, an adjusting member 7 and a driving assembly 8, and the worm 2, the extrusion member 5, the control spring 6, the adjusting member 7 and the driving assembly 8 are sequentially connected in a transmission manner; the pressure sensor is used for detecting the extrusion force value between the worm 2 and the turbine, and the controller controls the driving component 8 to drive the adjusting part 7 according to the extrusion force value.

Specifically, the automobile power assisting device provided by each embodiment of the invention is a power assisting device of an automobile steering system, and is used for providing power assistance for steering of an automobile, wherein the automobile power assisting device comprises a speed reducer and a power assisting motor, the speed reducer comprises a shell 11, a worm wheel 1 and a worm 2 which are meshed with each other are arranged in the shell 11, the worm 2 is driven by the power assisting motor, the worm wheel 1 realizes steering power assistance, and two ends of the worm 2 are connected to the shell 11 of the electric power assisting mechanism through bearings 4. The core of the embodiment lies in providing an active adjusting mechanism, which is adjusted by the active adjusting mechanism to control the gap between the worm wheel 1 and the worm 2, the active adjusting mechanism of the specific structure comprises a controller, a pressure sensor, an extrusion part 5, a control spring 6, an adjusting part 7 and a driving component 8, wherein the worm 2, the extrusion part 5, the control spring 6, the adjusting part 7 and the driving component 8 are sequentially in transmission connection, the transmission connection refers to that the adjacent two can realize transmission, most preferably direct butt joint, so that the worm 2 is butted against the extrusion part 5, the extrusion part 5 is butted against the control spring 6, the control spring 6 is butted against the adjusting part 7, the adjusting part 7 is driven by the driving component 8, so that the above components can be sequentially driven to move by the driving of the driving component 8, the core of the embodiment is that the control spring 6, the extrusion part 5 is used for connecting the control spring 6 and the worm 2, play the effect of adaptation to prevent the unable direct drive of worm 2 and control spring 6, and regulating part 7 is used for connecting control spring 6 and drive assembly 8, also plays the effect of adaptation, in order to prevent the unable direct drive of drive assembly 8 and control spring 6, if simplest extruded article 5 and regulating part 7 are a blind hole or insert the post, the tip of control spring 6 is direct spacing in the blind hole, perhaps inserts the post and pegs graft in the hole of control spring 6, so all can carry out the adaptation. The extrusion part 5 and the worm 2 can be directly or indirectly driven, for example, the extrusion part 5 can be driven by a bearing 4 sleeved on the worm 2, and obviously, the adjusting part 7 and the driving component 8 are also the same. In this embodiment, the control spring 6 serves as a core and has three functions, one of which is buffering and prevents the worm 2 from being directly driven by the active adjustment mechanism to impact the worm wheel 1, the control spring 6 serves as a transmission buffering mechanism, the other one of which serves as a test reference mechanism for the extrusion force, the size of the extrusion force can be obtained by detecting the length of the control spring 6, the third one serves as pressure adaptation, because the worm 2 has a certain radial play amplitude, if the control spring 6 is not provided, the extrusion force between the worm wheel 1 and the worm 2 is difficult to accurately control to fluctuate within a range, and the control spring 6 allows the worm 2 to have radial play as long as the extrusion force is within a certain range.

In this embodiment, the controller is used for communicating with the pressure sensor and the driving assembly 8, the controller is used for receiving the extrusion force value detected by the pressure sensor, the pressure sensor is used for detecting the extrusion force value between the worm 2 and the worm wheel, the pressure sensor can be directly arranged on the contact part of the worm 2 and the worm wheel 1, actually, based on the principle of force interaction, the pressure at each position on the abutting transmission chain of the active adjusting mechanism is equal to the extrusion force value, so the pressure sensor can be arranged between any two abutting structures on the sensing chain, meanwhile, the controller controls the driving assembly 8 to drive the adjusting member 7 according to the extrusion force value, the default premise is that when the gap between the worm wheel 1 and the worm 2 is controlled within a certain range, if the gap between the worm wheel 1 and the worm 2 is larger, the interval between the two pressure values is equal to 0, when the interval between the two pressure values is smaller, the interval between the two pressure values is continuously larger, so that the interval between the two pressure values can be obtained by analyzing the rule of the extrusion force values, and the corresponding rule between the extrusion force values and the interval can be obtained through limited experiments, which is not repeated.

In this embodiment, when detecting that the gap between the worm wheel 1 and the worm 2 is increased, the controller controls the driving assembly 8 to drive the adjusting member 7, so that the adjusting member 7 moves forward toward the control spring 6, and the adjusting member 7, the control spring 6, the extrusion member 5 and the worm 2 sequentially extrude, so that the extrusion worm 2 is close to the worm wheel 1, the gap between the two is reduced, and the extrusion force between the worm 2 and the worm wheel is maintained in a substantially constant state.

It should be noted that the adjustment in this embodiment should be a process of gradually detecting and gradually adjusting, and due to the continuous motion of the speed reducer, the value detected by the pressure sensor should be dynamically changed, which is a region that fluctuates within a certain range, but when the gap changes, the upper and lower limits of this region may change integrally, and the controller performs control based on the change of this range, and the correspondence between the gap and the fluctuation range may also be obtained through limited experiments, which is not described in detail.

According to the automobile power assisting device provided by the embodiment of the invention, the extrusion force between the worm 2 and the worm wheel is detected through the pressure sensor, the pressure between the worm wheel 1 and the worm 2 is actively adjusted through the driving assembly 8 based on the detection, the adjustment of the extrusion force between the worm 2 and the worm wheel can control the gap between the worm 2 and the worm wheel to be overlarge, and thus the extrusion force between the worm 2 and the worm wheel can be actively controlled to be in a basically constant state.

In another embodiment provided by the present invention, preferably, the controller is a control chip of the vehicle power assisting system or a main control chip of the vehicle, so that a dedicated chip does not need to be separately provided for this embodiment.

Preferably, the pressure sensor detects the extrusion force value of any two adjacent to the worm wheel, the worm 2, the extrusion member 5, the control spring 6, the adjusting member 7 and the driving assembly 8 as the extrusion force value between the worm 2 and the worm wheel, but in an alternative embodiment, the pressure sensor detects the deformation amplitude of the control spring 6 to obtain the extrusion force value through conversion, and the pressure in the pressure sensor is used for detecting the pressure, but actually, the pressure is a length sensing detection device for detecting the length of the control spring 6, for example, two ends of the control spring 6 are respectively provided with a mark point, the length of the control spring 6 can be obtained by detecting the distance between the two mark points through a camera or other sensing devices, and the length of the spring is in a proportional relation with the pressure, so that the deformation pressure of the control spring 6 is obtained through conversion, and in this case the camera or other length sensing device is here a pressure sensor.

In another embodiment of the present invention, further, the adjusting member 7 is screwed on the housing 11, if the adjusting member 7 includes a stud, the stud is screwed on the housing 11, one end of the stud abuts against the control spring 6, the blind hole or the stud is set to adapt to the control spring 6 as described above, and the other end is provided with a structure adapted to the driving assembly 8, if the other end is provided with a gear, the driving assembly 8 drives the gear to rotate, and the driving assembly 8 drives the adjusting member 7 to rotate to press the control spring 6.

In the embodiments of the present invention, the driving assembly 8 may be a power mechanism, for example, the driving assembly 8 is an electric driving assembly 8 such as a motor or a hydraulic driving assembly 8 such as a hydraulic cylinder, but since the adjustment is occasional and rare, it is more wasteful to arrange a power mechanism separately, preferably, the driving assembly 8 is an intermediate transmission mechanism, the driving assembly 8 is movably connected to, for example, rotate or reciprocate on the housing 11, the driving assembly 8 has an avoiding position and a transmission position on the moving stroke, in the transmission position, the moving member on the vehicle drives the adjusting member 7 through the driving assembly 8, and the active adjustment is performed, and the avoiding position, as the name implies, the driving assembly 8 is removed from the transmission position, the moving member cannot drive the adjusting member 7, where the moving member on the vehicle refers to a vehicle power system and a transmission system, such as an engine, a motor, a transmission system, etc., and preferably, the moving member is a steering column 3 or a reduction mechanism of a steering system of an automobile. Here drive assembly 8 is exactly a mechanism that can switch between two positions, and most commonly, drive assembly 8 is electro-magnet 8.1 and magnetism piece, along with the opening and close of electro-magnet 8.1, magnetism piece has two different positions, and in this embodiment, these two positions are exactly dodging position and transmission position respectively. The electromagnet 8.1 controls the magnetic attraction piece to switch between the avoiding position and the transmission position through opening and closing.

In this embodiment, it is preferable that the moving member is a steering column 3 of a steering system of an automobile, in the transmission position, the end of the rotational stroke of the steering column 3 presses the driving member 8 to drive the adjusting member 7, the end of the rotational stroke is a definite position, and a driving structure such as a protruding plate member is provided on the steering column 3 so that the driving member 8 is struck once each time the steering column 3 rotates to the end of the rotational stroke, it should be noted that the end of the rotational stroke is only for obtaining a definite driving position, and the steering column 3 may reach the position many times during a steering process of the automobile.

In a most preferred embodiment, the magnetic element includes a rotating disc 8.3 and a ratchet disc 8.4 coaxially juxtaposed, the edge of the ratchet disc 8.4 is provided with a ratchet, the rotating disc 8.3 and the ratchet disc 8.4 are fixedly connected through a central shaft, such that the rotating disc 8.3 and the ratchet disc 8.4 can move synchronously, the magnetic element further includes a driving lever 8.5 and an active pawl 8.6, the active pawl 8.6 is disposed on the driving lever 8.5, the active pawl 8.6 is in ratchet fit with the ratchet disc 8.4, i.e. the active pawl 8.6 is lapped on the ratchet of the ratchet disc 8.4, such that the active pawl 8.6 can drive the ratchet disc 8.4 to rotate unidirectionally, such as to rotate counterclockwise but not rotate clockwise, or vice versa, in this embodiment, the active pawl 8.6 is disposed on the driving lever 8.5, the driving lever 8.5 can swing, the driving force of the swing is from the electromagnet 8.1, the driving lever 8.5 is provided with a magnetic structure 8.2, and the magnetic structure 8.2 is disposed opposite to the electromagnet 8.1, thus, when the electromagnet 8.1 and the magnetic attraction structure 8.2 form magnetic attraction matching, when the electromagnet 8.1 is started, which is attracted or repelled with the magnetic attraction structure 8.2 to drive the magnetic attraction structure 8.2 to move, the movement of the magnetic attraction structure 8.2 drives the driving rod 8.5 to move, the driving rod 8.5 drives the driving pawl 8.6 to move, meanwhile, a reset spring can be arranged to reset the driving rod 8.5, so that the driving rod 8.5 can move repeatedly, namely swing repeatedly, along with the repeated opening and closing of the electromagnet 8.1, and the active pawl 8.6 is connected to the drive rod 8.5, so that when the drive rod 8.5 swings repeatedly, the active pawl 8.6 can also perform corresponding reciprocating motion, based on the ratchet matching, the active pawl 8.6 drives the ratchet disc 8.4 to perform unidirectional rotation, thus, although the active pawl 8.6 reciprocates, the ratchet plate 8.4 rotates intermittently in one direction, thereby realizing the synchronous rotation of the ratchet disc 8.4 and the rotating disc 8.3 driven by the electromagnet 8.1.

A reverse pawl 8.7 may also be provided in this embodiment, the reverse pawl 8.7 also being ratchet-engaged with the ratchet disc 8.4, but in contrast to the reverse pawl 8.7 being power-free, i.e. when the ratchet disc 8.4 is rotated in one direction, the reverse pawl 8.7 slides on the surface of the ratchet disc 8.4, and when the ratchet disc 8.4 has a tendency to rotate in the other, opposite direction, the anti-backup pawl abuts against the ratchet teeth of the ratchet disc 8.4 so that it cannot rotate, thus preventing the ratchet disc 8.4 from being reversed by the sliding of the active pawl 8.6 on the ratchet disc 8.4. In this embodiment, the resetting of each component can be performed through the elastic member, which is the prior art and is not described in detail.

In this embodiment, the purpose of the electromagnet 8.1 driving the rotation of the rotating disc 8.3 is to provide more than three transmission positions, the steering column 3 is provided with two driving wing plates 3.1, for example, two driving wing plates 3.1 are respectively provided at two diametrically opposite sides of the steering column 3 (shown in fig. 8-9), or two driving wing plates 3.1 are respectively provided at two positions in the axial direction, the rotating disc 8.3 is located at one side of the steering column 3, the edge portion provided on the rotating disc 8.3 is provided with at least one set of transmission intermediate members, the transmission intermediate members include a cylinder 8.8 and a transmission column 8.9 slidably connected in the cylinder 8.8, the transmission column 8.9 can be aligned with one of the two wing plates or have a plurality of transmission intermediate members respectively at the end position of the rotation stroke by means of a reset structure such as a position of a spring in the cylinder 8.8, through the rotation of the rotating disc 8.3, it is possible to switch between the turntable 8.3 and the steering column 3 between at least three positions: in the first position, at the end of the rotation travel, both drive wings 3.1 are docked without a transmission intermediate, in the second position, the first drive wing 3.1 has a transmission intermediate docking in the end of the rotation travel in one direction (for example in the counterclockwise direction of rotation of the steering column 3 in fig. 8), the second drive wing 3.1 is undone, in the third position, the second drive wing 3.1 has a transmission intermediate docking in the end of the rotation travel in the other direction (for example in the clockwise direction of rotation of the steering column 3 in fig. 9), and the first drive wing 3.1 is undone. The advantage of this arrangement is that the drive column 8.9 can provide two driving forces and also opposite driving forces, because the two drive wings 3.1 abut against one drive intermediate member at the end of their travel in different directions, where abutting means that when the drive wing 3.1 moves to this position, it strikes the drive column 8.9 of one drive intermediate member, causing it to move axially, as shown in the figure, because the drive column 8.9 has left after striking, thus not affecting the normal steering movement of the drive column 8.9 and the drive wing 3.1, while the drive intermediate members in the second position and in the third position do not have the same effect, the direction of movement of the drive intermediate member drive adjustment member 7 in the second position being opposite to the direction of movement of the drive intermediate member drive adjustment member 7 in the third position, as mentioned above, the adjustment member 7 can control the pressure between the worm 2 and the worm wheel by means of the control spring 6, this makes it possible to reduce an excessively large gap between the worm 2 and the worm wheel and to increase an excessively small gap (actually, an excessively large pressing force) between the worm 2 and the worm wheel. The transmission column 8.9 is in reciprocating motion, the adjusting piece 7 is in reciprocating motion, the reciprocating motion drives the reciprocating motion through the transmission structure, the prior art is adopted, various structures can be realized, which are not described in detail, and the invention adopts an example, as shown in fig. 8 and 9, a transmission column 8.9 extrudes a cross rod 9, so that the cross rod 9 is translated integrally, as shown in fig. 8, the driving column 8.9 is pressed to move the cross bar 9 downwards (shown in fig. 8), the other end of the cross bar 9 presses the adjusting piece 7 to move it downwards, while the end of the other transmission column 8.9 presses the lever 10, the other end of the lever 10 abuts against a projection on the adjusting piece 7, and the movement directions of both ends of the lever 10 are opposite to each other, as shown in fig. 9, one end of the lever 10 is pressed downward and the other end is pressed upward, thereby driving the adjusting part 7 to move upwards, and the transmission columns 8.9 at the two positions can drive the adjusting part 7 to move in different directions.

As described above, the movement of the ratchet disc 8.4 is driven by the on/off of the electromagnet 8.1, and the movement of the ratchet disc 8.4 drives the movement of the rotating disc 8.3 to enable the rotating disc to have at least three positions, wherein one position is that no transmission is performed between the steering column 3 and the driving assembly 8, and in the other two positions, the steering column 3 can provide two driving forces with different directions for the adjusting member 7 due to opposite moving directions, so as to provide different adjusting modes for the worm wheel 1 and the worm 2. In this embodiment, the rotating disc 8.3 rotates to align the transmission column 8.9 with the driving wing plate 3.1, and the position arrangement is simply performed, which is well known to those skilled in the art and will not be described in detail.

In the above embodiment, the driving wing 3.1 drives the driving post 8.9 on the driving stroke and on the reverse stroke of the driving stroke

Still further, a plurality of spherical holes are formed in the end portion of the transmission column 8.9, the rolling balls 8.10 are arranged in the spherical holes in a rolling mode, the rolling balls 8.10 are driven by the transmission column 8.9, the arrangement is characterized in that the driving wing plates 3.1 rotate, the transmission column 8.9 moves in a reciprocating mode, driving component force parallel to the driving wing plates 3.1 and the transmission column 8.9 can be removed through the rolling balls 8.10, only driving force in the axial direction of the transmission column 8.9 is reserved, and clamping stagnation and damage are prevented.

In each embodiment provided by the invention, the transmission mode between the extrusion piece 5 and the worm 2 has two options, one of which is that one end of the worm 2 extends out of the bearing 4 and is a transmission end, the control spring 6 extrudes the transmission end through the extrusion piece 5 to realize abutting transmission, and thus the control spring 6 extrudes the transmission end of the worm 2 through the extrusion piece 5, so that the bearing 4 is extruded relatively, various extrusion structures are conveniently designed on the transmission end, and meanwhile, the radial movement of the worm 2 can be reduced to bring pressure to the bearing 4 by directly limiting the worm 2, and the service life of the bearing 4 is prolonged. Its two for the bearing 4 endotheca in a spacing pipe, the transmission of butt is realized to 6 extruded article 5 extrudations of control spring extrusion spacing pipe, this moment, extruded article 5 extrudees spacing pipe, spacing pipe extrusion bearing 4, bearing 4 extrudees worm 2 and realizes the butt transmission, this is also the spacing mode of mainstream among the prior art, its direction of motion that compromises bearing 4 that can be better, thereby prevent that bearing 4 from interfering protection worm 2 to the spacing emergence of worm 2 with control spring 6. Obviously, all kinds of limiting modes of the transmission end can be directly used on the limiting pipe, which is simple to use, and can be understood by those skilled in the art, and are not described in detail.

In a preferred embodiment, the extrusion member 5 comprises an extrusion rod 5.1, two ends of the extrusion rod 5.1 are respectively provided with a butting ball 5.2, the butting balls 5.2 are connected with an expanded structure at the end part of the extrusion rod 5.1 in a rolling way, two butting balls 5.2 are respectively connected with two sides on a transmission end in a rolling way, such as the upper left side and the upper right side in fig. 4, the extrusion rod 5.1 can rotate in the middle part, such as one end of a control spring 6 is provided with an extrusion column, the middle part of the extrusion rod 5.1 is connected with the extrusion column in a rotating way, the preferred extrusion rod 5.1 is limited by a torsion spring arranged on a rotating shaft of the extrusion column, the middle part of the extrusion rod 5.1 is extruded by the control spring 6, the arrangement is that the extrusion rod 5.1 simultaneously extrudes two side surfaces of the transmission end of the worm 2 through the two butting balls 5.2, and the two butting balls 5.2 realize linkage on the two side surfaces, when the worm 2 is moved by the butting ball 5.2, the other abutting ball 5.2 is continuously attached to the worm 2 due to the linkage of the extrusion rod 5.1, so that the movement stability of the worm 2 is improved.

Still further, the transmission is served and is provided with the arc wall, butt ball 5.2 extrudees in the tank bottom of arc wall, so under the effect of torsional spring, butt ball 5.2 has from the reset effect, after extrusion at every turn, because the tank bottom is located the bottom of arc wall and the trend that makes butt ball 5.2 have the motion to the tank bottom of torsion spring that resets, thereby realize from resetting, butt ball 5.2 is for rolling rather than sliding relatively the arc wall, this has reduced the moving resistance, promoted from the reset effect.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.