KR20090021719A - Damping coupler and reducer having same - Google Patents

Abstract

A damping coupler is provided to improve the assembility since the primary rotor and the second rotor are inserted into the groove when the first rotor and the second rotor rotate. A damping coupler(400) comprises a primary rotor(410) in which a worm axis inserting hole(420) and one or more grooves(440) are formed, and a second rotor(460) in which a driving shaft inserting hole(470) and one or more connection part(490) are formed. The worm axis is inserted into the worm axis inserting hole. The groove of the primary rotor is formed at the circumference of the worm axis inserting hole. A driving shaft(205) is inserted into the driving shaft inserting hole.

Description

Damping Coupler and Reducer Having Same {Damping Coupler and Reducer Having Same}

The present invention relates to a damping coupler and a reducer equipped with the same. More specifically, the conventional damping coupler is a first rotor coupled to the worm shaft and formed with several through holes, an intermediate member inserted into the through hole, and a second rotor coupled to the shaft and formed with several connecting parts. When the first rotor is coupled to the worm shaft and the second rotor is coupled to the drive shaft, it is manually made. However, when the first rotor and the second rotor are coupled to each other, an automatic process is performed to the drive shaft when the conventional damping coupler is assembled. Automated assembly process caused by misalignment between the second serration formed on the worm shaft and the serration formed on the inner rotor of the damping coupler when the worm shaft is coupled to the damping coupler through an automated process after the damping coupler is manually engaged. The present invention relates to a damping coupler and a reducer equipped with the same, which can prevent a reduction of the assembly rate.

The steering device of the vehicle allows the driver to freely change the direction of travel of the vehicle by turning the steering wheel, and assists the driver in advancing the vehicle in the desired direction by arbitrarily changing the rotation center of the vehicle's front wheels. Equipment In this steering system, a power steering system is used as an auxiliary power mechanism to relieve the driver's power, and such a power steering system uses hydraulic power of the engine to operate a hydraulic pump to assist steering power. There is a hydraulic power assist steering device using an electric power assist steering device using an electric motor.

The hydraulic power assist steering device senses the rotation of the steering wheel and receives the rotational force from the engine to operate the hydraulic pump and sends the hydraulic pressure to a drive such as a cylinder configured on the rack bar or steering shaft to assist the driver's steering power.

The electric power assisted steering device has a structure that detects the rotation of the steering wheel and is installed on the rack or steering shaft to operate a motor that assists the rotational movement so that the steering device operates smoothly. The electric power assisted steering device is largely rack driven. There are two types (R-EPS) and steering shaft drive type (C-EPS).

1 is a schematic diagram of a conventional electric power assisted steering device.

As shown in FIG. 1, the electric power assist steering device includes an auxiliary power mechanism 120 that provides steering assistance power to the steering system 100 and the steering system 100 that extend from the steering wheel 101 to both wheels 108. It is configured to include.

The steering system 100 has one side connected to the steering wheel 101 to rotate together with the steering wheel 101, the other side is connected to the pinion shaft 104 via a pair of universal joint 103, the steering shaft 102 It is configured to include).

In addition, the pinion shaft 104 is connected to the rack bar through the rack-pinion mechanism 105, and both ends of the rack bar are connected to the wheel 108 of the vehicle through the tie rod 106 and the knuckle arm 107.

The rack-pinion mechanism 105 is formed by engaging the pinion gear 111 formed on the pinion shaft 104 and the rack gear 112 formed on one side of the outer circumferential surface of the rack bar, so that the driver operates the steering wheel 101. When the torque is generated in the steering system 100, the wheel 108 is steered through the rack-pinion mechanism 105 and the tie rod 106 by the torque.

The auxiliary power mechanism 120 detects the torque applied by the driver to the steering wheel 101 and outputs an electric signal proportional to the detected torque, and transmits a control signal based on the electric signal transmitted from the torque sensor. The electronic control unit (ECU) 123 generated, the motor 130 generating auxiliary power based on the signal transmitted from the electronic control device 120, and the auxiliary power generated from the motor are applied to the steering shaft 102. It is configured to include a motor deceleration mechanism 140 for transmitting.

2 is a cross-sectional view of a motor and a motor reduction mechanism of a conventional electric power assist steering device.

As shown in FIG. 2, the motor and the motor deceleration mechanism of the electric power assisted steering device include a motor 130, a drive shaft 205, an inner rotor 220, an outer rotor 215, an elastic body 210, and a first bearing ( 250, a worm shaft 235, a worm 245, a second bearing 270, a compression screw 255, a compression spring 265, and a gear housing 260.

The motor 130 has a drive shaft 205 extending out of the motor housing, the outer rotor 215 is interlocked with one side is connected to the drive shaft 215 inside the hollow.

The second bearing 270 and the first bearing 250 fix the worm 245 toward the worm wheel 240 installed on the steering shaft in which the torsion bar 230 is built.

The compression spring 265 supports the worm 245 in the direction of the worm wheel 240 using the compression screw 255, and supports the second bearing 270.

Therefore, when the compression screw 255 is tightened, the compression screw 255 is moved to constrict the compression spring 265. As a result, the worm 245 may be firmly bitten with the worm wheel 240 by the compression force of the compression spring 265. Will be.

The inner rotor 220 is connected to the worm shaft 235, and the inner rotor 220 has a structure in which one side is inserted into the outer rotor 215 connected to the driving shaft 205.

3 is a partially exploded perspective view of the motor and the motor speed reduction mechanism of the conventional electric power assist steering device.

As shown in FIG. 3, the electric power assisted steering device includes a damping coupler 360 including an outer rotor 215, an elastic body 310, and an inner rotor 220, a boss 310 connected to a driving shaft end, and a worm shaft 235. The outer rotor 215 has a structure capable of interpolating the inner rotor 220 and an elastic body 310 is provided between the inner rotor 220 and the outer rotor 215.

In addition, the inner rotor 220 is drilled with a hole 345 in which an axial serration is formed, so that an opposite second serration 350 is connected to a machined worm shaft 235, and a hole in which a serration is formed (not shown). The outer rotor 215 having a) is connected to the boss 310 having the first serration 342 in the axial direction on the outer circumferential surface thereof, and the boss 310 having the hole 340 having the axial serration formed therein. Is connected to the drive shaft 205 of the motor.

The process of assembling the conventional damping coupler of such a configuration into the drive shaft and the worm shaft first consists of manually inserting the damping coupler into the drive shaft and then inserting the worm shaft through the automated assembly process on the opposite side where the drive shaft is fitted. If the alignment does not match between the two serrations and the serrations formed in the hole of the inner rotor, there was a problem that the assembly rate of the automated assembly is reduced.

In order to solve this problem, the present invention is a conventional damping coupler coupled to the worm shaft and the first rotor is formed with several through holes, the intermediate member is inserted into the through holes, coupled to the shaft and formed several connections It consists of a second rotor, which is a manual damping when coupling the first rotor to the worm shaft and the second rotor to the drive shaft, but the manual damping coupler by working through an automated process when coupling the first rotor and the second rotor When the damping coupler is manually fastened to the drive shaft during assembly, the alignment between the second serration formed on the worm shaft and the serration formed on the inner rotor of the damping coupler does not match when the worm shaft is coupled to the damping coupler through an automated process. To provide a damping coupler and a reducer equipped with the same, which can prevent the reduction of the assembly rate in the automated assembly process. There is an enemy.

In order to achieve the above object, the present invention includes a first rotor including a worm shaft insertion hole in which a worm shaft is inserted and a third serration is formed along the inner circumferential surface, and at least one groove formed around the worm shaft insertion hole; And a second rotor including a drive shaft insertion hole in which a drive shaft is inserted and a fourth serration is formed along the inner circumferential surface, and at least one connection part protruding around the drive shaft insertion hole and inserted into the groove. It provides a damping coupler, characterized in that configured.

In addition, the present invention is a reducer comprising a drive motor, a worm, a damping coupler for mediating a drive shaft formed on the drive motor and the worm shaft formed on the worm, wherein the damping coupler is a third axis along the inner circumferential surface and the worm shaft is inserted A first rotor including a worm shaft insertion hole having a serration formed therein and at least one groove formed around the worm shaft insertion hole; And a second rotor including a drive shaft insertion hole in which a drive shaft is inserted and a fourth serration is formed along the inner circumferential surface, and at least one connection part protruding around the drive shaft insertion hole and inserted into the groove. It provides a reducer equipped with a damping coupler, characterized in that configured.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

4 is an exploded perspective view of a damping coupler according to an embodiment of the present invention.

As illustrated in FIG. 4, the damping coupler 400 according to the embodiment of the present invention includes a worm shaft insertion hole 420 in which a worm shaft 235 is inserted and a third serration 430 is formed along an inner circumferential surface thereof. Drive shaft in which the first rotor 410 and the drive shaft 205 including one or more grooves 440 formed around the insertion hole 420 are inserted and the fourth serration 480 is formed along the inner circumferential surface thereof. And a second rotor 460 including an insertion hole 470 and one or more connecting portions 490 formed to protrude around the drive shaft insertion hole 470 and inserted into the groove 440. In addition, the end of the connection portion 490 may be narrower gradually toward the tip, and may include a media member body portion 451 inserted into the groove 440 and the connection portion insertion groove 455 is formed in the center, In addition, at one end of the intermediate member body portion 451, the intermediate member head 453 may be formed. The.

The first rotor 410 comprises a worm shaft insertion hole 420 and one or more grooves 440, the first rotor 410 is preferably formed in a cylindrical shape.

The worm shaft 235 is inserted into the worm shaft insertion hole 420, and the third serration 430 is formed along the inner circumferential surface of the worm shaft insertion hole 420. The worm shaft insertion hole 420 is a conventional damping coupler 360. 3 corresponds to the hole 345 (see FIG. 3) of the inner rotor 220 (see FIG. 3), and the third serration 430 is formed on the inner circumferential surface of the hole 345 (see FIG. 3). Corresponding.

That is, in FIG. 3, the second serration 350 formed in the worm shaft 235 is connected to the serration formed in the hole 345 of the inner rotor 220, as shown in FIG. 4. In the damping coupler, the second serration 350 formed in the worm shaft 235 is connected to the third serration 430 formed in the worm shaft insertion hole 420 of the first rotor 410.

The grooves 440 are formed around the worm shaft insertion hole 420. In FIG. 4, four grooves 440 are formed while maintaining the same distance along the circumference of the worm shaft insertion hole 420. It is not necessarily limited thereto, and may be formed in three or less than five.

In addition, the intervals between the grooves 440 are not necessarily the same, and it may be appropriately disposed according to the position of the connection portion 490 of the second rotor 460 to be described later.

In addition, the groove 440 may be formed through the first rotor 410, but is not necessarily limited thereto, and the media member body 451 to be described later may be appropriately inserted / seated into the groove 440. It would be desirable to be formed in length.

In addition, although the cross section of the groove 440 is illustrated in FIG. 4, the present invention is not necessarily limited thereto, and may be formed in various shapes such as a rectangle according to the cross-sectional shape of the connection part 490 to be described later.

The second rotor 460 is configured to include a drive shaft insertion hole 470 and one or more connecting portions 490, the second rotor 460 is preferably formed in a cylindrical shape.

The drive shaft 205 is inserted into the drive shaft insertion hole 470, and the fourth serration 480 is formed along the inner circumferential surface of the drive shaft insertion hole 470. The drive shaft insertion hole 470 is a conventional damping coupler 360, 3 corresponds to a hole (not shown) formed in the outer rotor 215 (see FIG. 3).

That is, in FIG. 3, the first serration 342 formed on the drive shaft 205 is connected to the serration (not shown) formed on the outer rotor 215, as shown in FIG. 4. In the damping coupler, the first serration 342 formed on the drive shaft 205 is connected to the fourth serration 480 formed on the drive shaft insertion hole 470 of the second rotor 460.

The connecting portion 490 is formed around the drive shaft insertion hole 470. In FIG. 4, four connection parts 490 are formed while maintaining the same distance along the circumference of the driving shaft insertion hole 470. However, the present invention is not limited thereto, and three or less or five or more may be formed depending on the number of the grooves 440 formed in the first rotor 410.

In addition, the spacing between the connecting portions 490 does not necessarily have to be the same, and it may be appropriately disposed according to the position of the groove 440 of the first rotor 410 described above.

The length L of the connection portion 490 is a worm shaft (205) as the connection portion 490 is inserted into the groove 440 is coupled to the second rotor 460 and the first rotor 410 integrally coupled to the worm shaft (205). It may be desirable to form a suitable length so as to facilitate the delivery to 235).

In addition, although the cross section of the connecting portion 490 is shown in FIG. 4, the present invention is not limited thereto and may be inserted into the groove 440 to fix the second rotor 460 and the first rotor 410. As long as the cross-sectional shape is not limited.

In addition, the end of the connecting portion 490 may become narrower toward the tip (that is, toward the A direction). In FIG. 4, the width of the connecting portion 490 gradually decreases toward the A direction from the interruption of the connecting portion 490. The width of the connection part 490 may be gradually narrowed from the beginning of the connection part 490 (that is, the part where the connection part 490 and the body of the second rotor 460 meet).

The intermediate member body portion 451 is inserted into the groove 440 formed in the first rotor 410 and the connection portion insertion groove 455 is formed at the center thereof. The intermediate member body portion 451 is formed of an elastic member such as a rubber. It is preferable to be formed, but is not necessarily limited thereto.

The length of the intermediate member body portion 451 is preferably formed to be the same as the length of the groove 440 to be inserted into the groove 440 formed in the first rotor 410, the diameter to the outer peripheral surface is the intermediate member It is preferable that the body portion 451 is formed to be somewhat smaller than the diameter of the groove 440 so that it can be inserted into the groove 440 smoothly.

At this time, the cross-sectional shape of the groove 440 is not necessarily circular, and may be provided in various shapes such as a rectangle, so that the cross section of the intermediate member body portion 451 may also be formed corresponding to the cross-sectional shape of the groove 440. Do.

The connection part insertion groove 455 is formed at the center of the intermediate member body part 451, and the connection part insertion groove 490 protruding / formed into the second rotor 460 is inserted into the connection part insertion groove 455.

Therefore, the diameter of the connection part insertion groove 455 is preferably formed to be somewhat larger than the diameter of the connection part 490.

In addition, since the cross-sectional shape of the connection part 490 does not necessarily need to be circular, the cross-sectional shape of the connection part insertion groove 455 is preferably formed corresponding to the cross-sectional shape of the connection part 490.

In addition, the length of the connection part insertion groove 455 may be formed to be the same or somewhat longer than the length of the connection part 490 so that the connection part 490 can be fully inserted.

The intermediate member head 453 is formed at one end of the intermediate member body 451, where one end is opposite to the side where the intermediate member body 451 starts to be inserted into the groove 440 for the first time. it means.

In the following description, the intermediate member head 453 and the intermediate member body 451 will be referred to as an intermediate member 450.

In FIG. 4, the mediator head 453 has a disc shape, but is not necessarily limited thereto. When the mediator body 451 is inserted into the groove 440, the mediator body 451 is grooved. 440 may be any shape such as a square plate shape if the shape can serve as a locking step that can be prevented from being fully inserted into.

In addition, the height h of the intermediate member head 453 may be appropriately selected so as not to make the gap between the first rotor 410 and the second rotor 460 too large while serving as an appropriate locking jaw. Do.

That is, if the height h of the intermediate member head 453 is too low, the intermediate member head 453 may be separated / damaged from the intermediate member body 451 when an external force such as friction is applied. If the height h of the member head 453 is too high, the first rotor 410 and the second rotor 460 are connected when the first rotor 410 and the second rotor 460 are connected by the intermediate member 450. Since the distance between the drive shaft 205 and the worm shaft 235 rotates so large that the torsional stress acting on the intermediate member body portion 451 may increase, and thus the intermediate member body portion 451 may be damaged. It is preferable to determine the height h of the medial member head 453.

Briefly describing the process of assembling the damping coupler according to an embodiment of the present invention.

First, the operator couples the first rotor 410 to the worm shaft 235 and the second rotor 460 to the drive shaft 205.

In this case, the alignment of the second serration 350 of the worm shaft 235 and the third serration 430 of the first rotor 410 should be aligned, and the first serration 342 of the driving shaft 205 may be aligned. ) And the alignment of the fourth serration 480 of the second rotor 460 must be aligned, so that the combination of the first rotor 410 and the worm shaft 235 and the combination of the second rotor 460 and the drive shaft 205 are manually performed. It is preferable to set it as.

Thereafter, the first rotor 410 and the second rotor 460 are coupled through an automated process. When the intermediate member 450 is mounted, the intermediate member 450 is inserted into the groove 440 or the connecting portion ( 490) a work process is required and such a process may also be configured as an automated process.

At this time, the end of the connecting portion 490 is processed into a shape that gradually decreases in diameter as it goes to the front end (that is, toward the A direction), so that the center of the groove 440 and the center of the connecting portion 490 do not coincide with each other in the automated process. If not, once the end of the connecting portion 490 is inserted into the groove 440, the first rotor 410 and the second rotor 410 as the gap between the first rotor 410 and the second rotor 460 is narrowed. Since relative rotation occurs automatically between the rotor 460, the connection part 490 is inserted into the groove 440, thereby increasing the assembly rate of the automated process.

The damping coupler described above will be particularly useful when applied to a reducer comprising a driving motor, a worm, a drive shaft formed on the drive motor and a damping coupler that forms a worm shaft formed on the worm among the steering devices of the vehicle.

The above description is merely illustrative of the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential features of the present invention. Accordingly, the embodiments disclosed herein are not intended to limit the present invention but to describe the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the same scope should be interpreted as being included in the scope of the present invention.

1 is a schematic diagram of a conventional electric power assisted steering device;

2 is a cross-sectional view of a motor and a motor deceleration mechanism of a conventional electric power assisted steering device;

3 is an exploded perspective view of a part of a motor and a motor deceleration mechanism of a conventional electric power assist steering device; And

4 is an exploded perspective view of a damping coupler according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: steering system 102: steering shaft

104: pinion shaft 130: drive motor

140: motor reduction mechanism 205: drive shaft

400: damping coupler according to an embodiment of the present invention

410: first rotor 420: worm shaft insertion hole

430: third serration 440: home

450: intermediate member 460: second rotor

470: drive shaft insertion groove 480: fourth serration

490: connection

Claims (8)

A first rotor including a worm shaft insertion hole in which a worm shaft is inserted and a third serration is formed along the inner circumferential surface, and one or more grooves formed around the worm shaft insertion hole; And A second rotor including a drive shaft insertion hole in which a drive shaft is inserted and a fourth serration is formed along the inner circumferential surface, and at least one connection part protruding around the drive shaft insertion hole and inserted into the groove; Damping coupler, characterized in that comprises a. The method of claim 1, Damping coupler, characterized in that it comprises a medium member body portion inserted into the groove and the connection portion insertion groove is formed in the center. The method of claim 2, Damping coupler, characterized in that the intermediate member head portion is formed at one end of the intermediate member body portion. The method of claim 1, Damping coupler, characterized in that the end portion of the connecting portion becomes narrower toward the tip. In the reducer comprising a drive motor, a worm, a damping coupler for mediating a drive shaft formed in the drive motor and the worm shaft formed in the worm, The damping coupler A first rotor including a worm shaft insertion hole in which a worm shaft is inserted and a third serration is formed along the inner circumferential surface, and one or more grooves formed around the worm shaft insertion hole; And A second rotor including a drive shaft insertion hole in which a drive shaft is inserted and a fourth serration is formed along the inner circumferential surface, and at least one connection part protruding around the drive shaft insertion hole and inserted into the groove; Reducer equipped with a damping coupler, characterized in that comprising a. The method of claim 5, wherein Reducer equipped with a damping coupler characterized in that it comprises a medium member body portion inserted into the groove and the connection portion insertion groove is formed in the center. The method of claim 6, Reducer equipped with a damping coupler, characterized in that the intermediate member head portion is formed at one end of the intermediate member body portion. The method of claim 5, wherein An end of the connection portion is a reducer equipped with a damping coupler, characterized in that gradually narrower toward the tip.

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