KR100970117B1 - Worm Gear Backlash Control Apparatus and Steering System Equipped with Same - Google Patents

Abstract

The present invention relates to a worm gear backlash control device and a steering device equipped with the same, wherein an integral housing is formed by separating a worm housing surrounding the worm and a worm wheel housing surrounding the worm wheel, and connecting them with a connecting means to connect the worm housing to the worm wheel. Since the relative rotation is possible with respect to the housing, due to the relative rotation of the worm housing and the worm wheel housing, there is an effect that can easily adjust the backlash and play.

Worm, worm wheel, backlash, play, elastic member

Description

Worm Gear Backlash Control Apparatus and Steering System Equipped with It {Worm Gear Backlash Control Apparatus and Steering System Equipped with Same}

The present invention relates to a worm gear backlash control device and a steering device equipped with the same. More specifically, the housing is integrally formed to surround the worm and the worm wheel, and is formed by separating the worm housing surrounding the worm and the worm wheel housing surrounding the worm wheel, and connecting them with a connecting means, so that the worm housing can rotate relative to the worm wheel housing. To this end, the present invention relates to a worm gear backlash control device and a steering device equipped with the same, which can easily adjust backlash and play due to relative rotation of the worm housing and the worm wheel housing.

The steering device of the vehicle is a device for changing the driving direction of the vehicle at the driver's will, and is a device for assisting the driver in driving the vehicle in a desired direction by arbitrarily changing the center of rotation of the front wheel.

Recently, the steering shaft is separated to actively cope with the external environment such as the strong wind blowing during driving or the condition of the road surface which is not symmetrical to the left and right, and the steering angle caused by the driver's steering wheel operation is not directly transmitted to the steering column. Active front wheel steering system (AFS) that adjusts the steering angle by continuously detecting the changing steering angle, comparing it with various information of the vehicle, and transmitting it as an electrical signal to the motor that controls the steering shaft rotation of the steering column. Steering System) appeared.

In addition, such an active front wheel steering apparatus is provided with a gear ratio converter for converting a gear ratio between an input shaft and an output shaft.

1 is a configuration diagram of an active front wheel steering apparatus of a conventional vehicle, and FIG. 2 is a schematic view showing a gear ratio converter.

As shown in FIG. 1, an active front wheel steering apparatus of a conventional vehicle includes a steering wheel 101, a steering column 103 connected to a steering wheel 101, and a steering column 105 surrounding the steering shaft 103. The first motor for driving the gear ratio converter 110, the gear ratio converter 110, which is formed below the input angle sensor 107, is formed at the lower end of the steering column 105. 111, the motor position sensor 113 provided in the first motor 111, the output angle sensor 115 formed on the lower side of the gear ratio converter 110, the vehicle speed sensor 117 for detecting the speed of the vehicle, gear ratio The second motor 123 is formed on the lower side of the converter 110, for supplying steering assist power to the rack-pinion mechanism portion 121, the rack bar 119 for converting the rotational motion of the output shaft into a linear motion of the rack bar 119. ), The ECU 125 receives various signals from the input angle sensor 107, the motor position sensor 113, and the output angle sensor 115.

As shown in FIG. 2, the gear ratio converting apparatus 110 includes an input shaft 210 which is a part of the steering shaft 103 and a first sun gear 220 formed at a lower end of the input shaft 210. The first planetary gear 270 external to the first sun gear 220, the second planetary gear 280 connected to the first planetary gear 270 and the planetary gear shaft 275, and the second planetary gear 280. And an input shaft 210 engaged with the second sun gear 230, the output shaft 240 connected to the second sun gear 230, the worm 260 connected to the first motor 111, and the worm 260. ) Is arranged to penetrate and is integrally formed with the worm wheel 250 and the worm wheel 250 connected to one side of the planetary gear shaft 275, the output shaft 240 is disposed to pass through and connected to the other side of the planetary gear shaft 275. Carrier 290, housing 200 adapted to enclose these members.

The operating principle of the active front wheel steering device and the gear ratio converter of a conventional vehicle having such a configuration is as follows.

As the driver operates the steering wheel 101, when the input shaft 210 which is a part of the steering shaft 103 rotates, the first sun gear 220 formed at the lower end of the input shaft 210 cooperates with the input shaft 210. Rotate In addition, the first planetary gear 270, which is circumscribed with the first sun gear 220, also rotates, and the second planetary gear 280 connected by the first planetary gear 270 and the planetary gear shaft 275 is rotated. Will rotate. Finally, the second sun gear 230 which is external to the second planetary gear 280 is rotated, so that the output shaft 240 extending from the second sun gear 230 is rotated, so that the steering of the driver The steering force generated according to the wheel 101 operation is transmitted to the rack-pinion mechanism part 121.

However, the above process is a case where the first motor 111 does not operate, and when the first motor 111 operates, the following changes occur.

Electrical signals are generated from the vehicle speed sensor 117 for detecting the speed of the vehicle, the input angle sensor 107, the output angle sensor 115, and the motor position sensor 113 for detecting a change in the steering angle. ), The ECU 125 drives the first motor 111 by transmitting an electrical signal to the first motor 111.

When the first motor 111 is driven as described above, the worm 260 connected to the motor shaft (not shown) also rotates, and accordingly, the worm wheel 250 engaged with the worm 260 rotates and finally the worm wheel 250 As the carrier 290 integrally rotates, the ratio of the output angle to the input angle can be adjusted.

The active front wheel steering device of the vehicle rotates the input shaft 210, the first sun gear 220 and the first planetary gear 270 by operating the steering wheel 101 in one direction when the vehicle is traveling at high speed. Even though the first motor 111 rotates in the direction in which the ECU 125 rotates in the direction in which the worm wheel 250 and further the carrier 290 interfere with the rotation of the second planetary gear 280 connected to the first planetary gear 270. In the end, the rotation angle of the output shaft 240 is smaller than the rotation angle of the input shaft 210, thereby assisting in safe driving.

On the other hand, the active front wheel steering device of the vehicle controls the first motor 111 in a direction in which the rotation angle of the output shaft 240 becomes larger than the rotation angle of the input shaft 210 when the vehicle is in a low speed state for parking or the like. This allows the driver to easily drive with less force.

However, in the worm wheel 250 and the worm 260 used in the gear ratio converter 110 having such a configuration, there is a backlash between the gear teeth engaged with each other. The backlash refers to a gap between gear teeth adjacent to each other, and more specifically, refers to a space generated behind the meshed gear teeth when the gear teeth of one gear and the gear teeth of another gear are engaged with each other.

On the other hand, in a gear device in which the drive gear and the driven gear mesh, there is no problem when the speed of the drive gear and the driven gear is constant, but if the speed is not constant for some reason, noise may occur due to the backlash.

That is, the gear teeth of the driven gear hit the rear of the gear teeth of the drive gear before the gear teeth of the driven gear and the driven gear which are engaged with each other finish.

In the steering apparatus of automobiles, the noise generated by such a backlash causes discomfort during steering and gradually promotes wear of gear teeth. Therefore, the worm and the worm wheel constituting the gear ratio converter as described above must go through a process of adjusting the distance between the worm and the worm wheel to manage the backlash, play and noise, this process is first the center distance of the worm and worm wheel It is a difficult process of measuring the center distance between the housing and the worm wheel in the second place and matching the gap between the worm and the worm wheel on the basis of the first and second measurement values, which leads to complicated process procedures and excessive inventory. There was a problem.

In order to solve this problem, the present invention is formed by separating the housing integrally surrounding the worm and the worm wheel, the worm housing surrounding the worm and the worm wheel housing surrounding the worm wheel, and connecting them by a connecting means to the worm housing to the worm wheel housing It is an object of the present invention to provide a worm gear backlash control device and a steering device equipped with the same, which allow relative rotation of the worm housing and the worm wheel housing to easily adjust the backlash and the clearance due to the relative rotation of the worm housing and the worm wheel housing.

Gear gear backlash adjusting device according to the present invention for achieving this object, the one side is coupled to the motor, the worm housing worm inner; A worm housing support disposed in the longitudinal direction of the worm housing, the connecting hole being perforated so that the connecting means can penetrate at one side, and the guide hole penetrating the fixing means at the other side thereof; A worm wheel housing in which the worm housing support is formed on one side of the outer circumference, the worm wheel is in the inner side, and at least one first fastening part is formed at one end; And a worm wheel housing cover formed on an outer circumferential surface of the second fastening portion connected to the first fastening portion and the fastening means and coupled to one end of the worm wheel housing.

In addition, the worm gear backlash control device according to the present invention, the worm housing, one side is coupled to the motor, the worm is in the inner side, the first insertion groove is formed on one side and the third insertion groove is formed on the other side in the longitudinal direction; A worm housing support disposed in the longitudinal direction of the worm housing, the connecting hole being perforated to allow the connecting means to penetrate at one side thereof; The worm housing support is formed on one side of the outer circumferential surface, the worm wheel is in the inner periphery, at least one first fastening portion is formed at one end, and the second insertion groove and the third insertion groove in correspondence to the first insertion groove and the third insertion groove. A worm wheel housing each having four insertion grooves formed therein; A first elastic member inserted in communication with the first insertion groove and the second insertion groove; A second elastic member inserted in communication with the third insertion groove and the fourth insertion groove; And a worm wheel housing cover formed on an outer circumferential surface of the second fastening portion connected to the first fastening portion and the fastening means and coupled to one end of the worm wheel housing.

In addition, the steering apparatus according to the present invention is characterized in that the worm gear backlash adjustment device as described above is mounted.

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 the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Worm gear backlash control device according to embodiments of the present invention can be applied to various types of devices that need to adjust the backlash, etc. between the gear teeth of the worm and worm wheel, in particular applied to the gear ratio conversion device of the active front wheel steering of the vehicle If so, its utility will be high.

Figure 3a is a perspective view of the worm gear backlash adjustment device according to the first embodiment of the present invention, Figure 3b is a front view of the worm gear backlash adjustment device according to the first embodiment of the present invention, Figure 3c is "A" shown in Figure 3b It is an enlarged view showing the modifications of.

3A, 3B, and 3C, the worm gear backlash adjusting device according to the first embodiment of the present invention has one side corresponding to the motor 111: the first motor of FIG. 1. In combination with the "motor 111"), and a worm housing 310, the worm (not shown), the inner circumference; It is disposed along the longitudinal direction of the worm housing 310, the connection hole 352 is perforated so that the connection means 351 can penetrate at one side, the guide hole through which the fixing means 353 penetrates to the other side ( A worm housing support 350 in which 354 is perforated; The worm housing support 350 is formed on one side of the outer circumference, a worm wheel (not shown), the worm wheel housing 340 is formed, the one or more first fastening portion 360 is formed at one end; The first fastening part 360 and the second fastening part 380 connected to the fastening means 390 are formed on the outer circumferential surface of the worm wheel housing cover 370 coupled to one end of the worm wheel housing 340. It is configured by.

The worm housing 310 corresponds to a portion surrounding the worm 260 (see FIG. 2) in the conventional housing 200 (see FIG. 2), and one side is coupled to the motor 111 and the worm is indwelled therein.

One end of the worm housing 310 may be formed by protruding the connecting portion 320 to which the connecting means 351 is coupled, while the other end of the worm housing 310 is formed to protrude the fixing portion 330 to which the fixing means 353 is coupled. The connection portion 320 and the fixing portion 330 may be formed to protrude between the worm housing 310 and the worm housing support 350, as shown in Figure 3a, the connecting means 351 and The fixing means 353 may be inserted into a groove or a hole in the worm housing 310 so as to couple the worm housing 310 and the worm housing support 350.

Connection means 351, the worm housing 310 is preferably a pin so that it can rotate around the connection hole 352 of the worm housing support 350, but is not necessarily limited to this, the worm housing 310 is Anything that can be rotated smoothly can be used, for example, it may be composed of a pair of bolts that are screwed to the connection portion 320 of the worm housing 310 through each connection hole 352.

Worm housing support 350 is disposed along the longitudinal direction of the worm housing 310 and wrapped on both sides, the connection hole 352 is perforated so that the connection means 351 can penetrate at one side of the worm housing 310, the other side A guide hole 354 through which the fixing means 353 penetrates is drilled.

Here, the meaning that the worm housing support 350 wraps the worm housing 310 at both sides is provided in two plate shapes protruding from the worm wheel housing 340 which the worm housing support 350 is described later. 310 is located between them.

Thus, when the worm housing 310 is located between the worm housing support 350, between the worm housing 310 and the worm housing support 350, the connecting portion 320 and the fixed portion (on both sides of the worm housing 310) When the 330 is formed to protrude, it is preferable that there is little gap between the ends of the connection part 320 and the fixing part 330 and the worm housing support 350, and the connection parts (both sides of the worm housing 310) If the 320 and the fixing part 330 are not protruded and are formed as grooves or holes in the worm housing 310, it may be preferable that there is little gap between the worm housing 310 and the worm housing support 350. will be.

The guide hole 354 of the worm housing support 350 is a guide to which the fixing means 353 moves when the worm housing 310 rotates relative to the worm wheel housing 340 via the connecting means 351. The worm wheel 310 and the worm wheel housing 340 are aligned with the worm housing 310 and the worm wheel housing 340 so as to have proper backlash and play between the worm and the worm wheel, and then tighten the fixing means 353 to worm wheel housing 340. I can fix it in).

Fixing means (353) is made of a bolt, in particular stud bolt, it is inserted into the fixing part 330 through one guide hole 354, and then each nut is attached to the portion exposed to the outside of both guide holes 354 Can be fastened by fastening, but is not necessarily limited to these bolts.

In addition, a thread is machined on the inner circumferential surface of the fixing part 330, and the stud bolt may be screwed.

The guide hole 354 may be in an open shape (see the right figure of FIG. 3C), as shown in FIG. 3C, or in a closed shape (see the left view of FIG. 3C). However, the width of the guide hole 354 is preferably formed so that the fixing means 353 can move smoothly, the fixing means 353 can not pass through the guide hole 354.

The worm wheel housing 340 has a worm housing support 350 formed at one side of the outer circumferential surface thereof, and a worm wheel is formed therein, and at least one first fastening portion 360 is formed at one end thereof. These first fastening parts 360 are coupled to the second fastening parts 380 formed on the worm wheel housing cover 370 by the fastening means 390.

In the embodiments of the present invention, the first fastening portion 360 and the second fastening portion 380 are shown as being formed along the circumference of the worm wheel housing 340 and the worm wheel housing cover 370, respectively. However, the present invention is not limited thereto, and the number and shape may be variously changed.

As the fastening means 390, for example, a bolt may be used, but any one may be used as long as the fastening means 390 can be coupled to the first fastening portion 360 and the second fastening portion 380.

As described above, the worm wheel housing cover 370 has a second fastening portion 380, so that the second fastening portion 380 is fastened by the fastening means 390 to the first fastening portion 340 of the worm wheel housing 340. Combined with 360, the worm wheel housing cover 370 is coupled to one side of the worm wheel housing 340.

In addition, the worm wheel housing cover 370 has a hole formed at the center thereof so that the input shaft 210 penetrates, and the output shaft 240 extends through the worm wheel housing 340 on the opposite side of the input shaft 210.

The worm housing 310 should be rotatable with respect to the worm wheel housing 340, the connection means 351 extending through the connection hole 352 as the rotation axis, the worm housing 310 and the worm wheel housing 340 Should be formed separately, and in particular, the boundary portion where the worm housing 310 and the worm wheel housing 340 meet should have an appropriate spacing.

When the operator adjusts the backlash in the worm gear backlash control device according to the first embodiment of the present invention configured as described above is as follows.

First, when the backlash existing between the worm wheel provided in the worm wheel housing 340 and the gear teeth of the worm provided in the worm housing 310 is large, the worker places the worm housing 310 with respect to the worm housing support 350. The connecting means 351 is rotated so as to be in close contact with the worm wheel housing 340 by rotating the shaft. In this way, by changing the inclination of the wheel of the motor shaft fixed to the worm housing 310 by tightening the fixing means 353 The position of the worm housing 310 is fixed. Therefore, since the gap between the worm and the gear teeth of the worm wheel is narrowed, the backlash of the worm gear is eventually reduced.

On the contrary, when the backlash between the gear teeth of the worm and the worm wheel is small, the backlash between the gear teeth of the worm and the worm wheel may be increased by rotating the worm housing 310 in the opposite direction.

In this way, there is an advantage that the process of adjusting the gap between the worm and the worm wheel is much easier.

Figure 4a is a perspective view of the worm gear backlash control device according to a second embodiment of the present invention, Figure 4b is a front view of the worm gear backlash control device according to a second embodiment of the present invention, Figure 4c is a cross-sectional view taken along line BB of Figure 4b. .

As shown in Figure 4a, 4b and 4c, in the worm gear backlash control device according to the second embodiment of the present invention, one side is coupled to the motor 111, the worm 260 is inner, one side A worm housing 310 in which one insertion groove 421 is formed and a third insertion groove 432 is formed at the other side in the longitudinal direction; A worm housing support 350 disposed along the longitudinal direction of the worm housing 310 and having a connection hole 352 perforated so that the connection means 351 can penetrate at one side thereof; The worm housing support 350 is formed on one side of the outer circumference, the worm wheel 250 is formed on the inner side, and at least one first fastening portion 360 is formed at one end thereof, and the first insertion groove 421 and the first agent are formed. A worm wheel housing 340 in which a second insertion groove 422 and a fourth insertion groove 471 are respectively formed corresponding to the third insertion groove 432; A first elastic member 424 inserted in communication with the first insertion groove 421 and the second insertion groove 422; A second elastic member 425 inserted into communication with the third insertion groove 432 and the fourth insertion groove 471; The first fastening part 360 and the second fastening part 380 connected to the fastening means 390 are formed on the outer circumferential surface of the worm wheel housing cover 370 coupled to one end of the worm wheel housing 340. It is configured by.

The worm housing 310 has one side coupled to the motor 111 and the worm 260 is formed therein, and the first insertion groove 421 is formed at one side and the third insertion groove 432 is formed at the other side. have. In addition, once the support portion 430 may be formed to protrude on both sides, the connecting portion 320 to which the connecting means 351 is coupled may be formed to protrude, where the connecting portion 320 is the first embodiment of the present invention. Since it is the same as the connection portion formed in the worm housing of the worm gear backlash control device according to the example, a description thereof will be omitted.

The support part 430 supports the worm housing 310 so as not to be shaken between the worm housing support 350 when the worm housing 310 is pivoted about the connection part 420 to move or when vibration occurs. Play a role.

The first insertion groove 421 is recessed in one side of the worm housing 310 (that is, the side where the motor 111 of the worm housing 310 is coupled), and the width of the first insertion groove 421 is defined by the first elastic member 424. It is preferable that the first elastic member 424 be formed to be slightly wider than the width of the first elastic member 424 to be inserted. In addition, the depth of the first insertion groove 421 may be properly formed so that the first elastic member 424 may be seated.

The third insertion groove 432 is formed on the other side of the worm housing 310 (that is, the opposite side of the first insertion groove 421 in the longitudinal direction of the worm housing 310), preferably the worm housing 310 It is formed in the third insertion groove 431 formed to protrude from one side of the elongated.

The length of the third insertion groove 431 may be about the radius of the circular cross section of the worm housing 310 as shown in FIG. 4A, but is not limited thereto and may be formed longer or shorter. In addition, the cross-sectional shape of the third insertion groove 431 may be approximately circular so that the second elastic member 425 may be seated in the third insertion groove 432.

Worm housing support 350 is disposed along the longitudinal direction of the worm housing 310 and wrapped on both sides, the connection hole 352 is perforated so that the connection means 351 can penetrate at one side of the worm housing 310, the other side Guide grooves 454 for guiding the support 430 to move may be formed to be recessed to a certain depth, this guide groove 454 may be omitted.

The worm wheel housing 340 has a worm housing support 350 formed at one side of the outer circumferential surface thereof, and a worm wheel 250 is formed therein, and at least one first fastening portion 360 is formed at one end thereof. In addition, the second insertion groove 422 and the fourth insertion groove 471 formed in the worm wheel housing 340 correspond to the first insertion groove 421 and the third insertion groove 432 formed in the worm housing 310, respectively. Is formed.

The second insertion groove 422 is preferably formed in the second insertion groove portion 423, the second insertion groove 422 is formed to face the first insertion groove 421 when assembled, the first elastic member 424 is inserted in communication with these insertion grooves. In addition, the second insertion groove 423 is protruded from one side of the worm wheel housing 340 is formed long.

The fourth insertion groove 471 is preferably formed in the fourth insertion groove 470, the fourth insertion groove 471 is formed to face the third insertion groove 432 when assembled, the second elastic member 425 is inserted in communication with these insertion grooves. In addition, the fourth insertion groove 470 is formed on the other side of the worm wheel housing 340 (that is, the opposite side of the second insertion groove 423 on the basis of the worm wheel 250), and the cross-sectional shape of the fourth insertion groove 470 is the second elastic member ( 425 may be approximately circular so that it can be seated in the fourth insertion groove 471.

Adjusting means (473) having a hollow portion is fastened to the fourth insertion groove 471, the thread processing on the inner circumferential surface of the fourth insertion groove 471, and also the thread processing on the outer circumferential surface of the adjustment means 473, adjustment means ( It is preferable to screw 473 to the fourth insertion groove 471. In addition, the second elastic member 425 is fitted into the hollow portion or the fitting groove 472 of the adjusting means 473, thereby allowing the adjusting means 473 to enter or withdraw the fourth inserting groove 471. The elastic member 425 can be stably compressed or extended.

The first elastic member 424 and the second elastic member 425 are formed of a coil spring, and the spring constant values of the first elastic member 424 and the second elastic member 425 are the worm wheel housings. 340 is appropriately selected so that it can be fixed. Accordingly, the elastic members 424 and 425 disposed on both sides of the connecting means 351 acting as hinges and supporting points simultaneously apply elastic forces to the worm housing 310 and the worm wheel housing 340, respectively, and these elastic forces While being in a balanced state, the coupling between the worm housing 310 and the worm wheel housing 340 is maintained.

Since the connecting means 351 is the same as the connecting means of the first embodiment, a description thereof will be omitted.

The worm wheel housing cover 370 has a second fastening portion 380 which is coupled to the first fastening portion 360 of the worm wheel housing 340 by the fastening means 390, and is formed at one side of the worm wheel housing 340. To be combined.

Since the fastening means 390 is also the same as the fastening means of the first embodiment, a description thereof will be omitted.

When the operator adjusts the backlash in the worm gear backlash control device according to the second embodiment of the present invention configured as described above is as follows.

When the backlash existing between the worm wheel provided in the worm wheel housing 340 and the gear teeth of the worm provided in the worm housing 310 is small, the worker warms the worm housing 310 using the adjusting means 473. The pivoting means of the connecting means 351 is pivoted with respect to the support 350, and when it is turned, the inclination of the worm wheel of the motor shaft fixed to the worm housing 310 is changed, so that the gap between the worm and the gear tooth of the worm wheel is changed. As a result, the backlash of the worm gear is appropriately increased.

That is, when the operator manipulates the adjusting means 473 to be introduced into the fourth insertion groove 470, the second elastic member 425 positioned between the third insertion groove 432 and the fourth insertion groove 471. ) Pushes the third insertion groove 431, so that the worm housing 310 is rotated by a predetermined angle around the connecting means 351, so that the gap between the gear teeth of the worm and the worm wheel is opened. . At this time, the first elastic member 424 positioned between the first insertion groove 421 and the second insertion groove 422 is finely compressed.

On the contrary, when the backlash between the gear teeth of the worm and the worm wheel is large, when the adjusting means 473 is pulled out of the fourth insertion groove 470, the worm housing 310 is turned in the opposite direction to the above, so that the worm and the worm wheel The backlash between the gear teeth is reduced accordingly.

In this way, there is an advantage that the process of adjusting the gap between the worm and the worm wheel is much easier.

In addition, in the case of the worm gear backlash adjustment device according to the second embodiment of the present invention, the first elastic member 424 and the second elastic member 425 vibration generated between the worm housing 310 and the worm wheel housing 340 It also serves to absorb the back. At this time, the spring constant value of the first elastic member 424 and the second elastic member 425 can absorb the vibration generated between the worm housing 310 and the worm wheel housing 340, while the worm housing 310 Should be appropriately selected to secure the position relative to the worm wheel housing 340.

That is, if the spring constant value is too large, vibrations generated between the worm housing 310 and the worm wheel housing 340 may not be properly absorbed, and if the spring constant value is too small, the worm wheel housing 340 of the worm housing 310 may be inadequate. Because it will not be possible to reliably position the.

Figure 5a is a perspective view of a worm gear backlash control device according to a third embodiment of the present invention, Figure 5b is a cross-sectional view of the worm gear backlash control device according to a third embodiment of the present invention, as shown in the In the worm gear backlash adjustment device according to the third embodiment, a through hole communicating with the third insertion groove 432 is formed in the third insertion groove 431, and the fitting groove 472 of the adjustment means 473 is formed through the through hole. And a support bolt 474 inserted into the second elastic member 425 and screwed with the adjustment means 473, and disposed between the third insertion groove 431 and the support bolt 474 of the worm housing 310. The structure is similar to that of the second embodiment, except that the third elastic member 426 is further provided.

By providing the support bolt 474 and the third elastic member 426 as described above, the coupling of the worm housing 310 and the worm wheel housing 340 is maintained by the first elastic member 424 and the second elastic member 425. When the connection means 351 and the support bolt 474 together with the worm housing 310 and the worm wheel housing 340 is firmly fixed to each other, in particular by the third elastic member 426 worm housing 310 is forced to the worm wheel housing 340 is fixed more reliably, thereby having the advantage that the assembly of the device is greatly improved.

In the worm gear backlash adjusting apparatus according to the third embodiment of the present invention configured as described above, a process of adjusting the backlash by the operator will be briefly described as follows.

When the backlash existing between the worm wheel provided in the worm wheel housing 340 and the gear teeth of the worm provided in the worm housing 310 is large, that is, the operator pulls the support bolt 474 into the adjusting means 473. When the operation is performed, the second elastic member 425 located between the third insertion groove 432 and the fourth insertion groove 471 is compressed, and the worm housing 310 has a predetermined angle around the connection means 351. By turning as much as possible, the gap between the gear teeth of the worm and the worm wheel is narrowed, and the backlash of the worm gear is reduced.

On the contrary, when the backlash between the worm and the gear tooth of the worm wheel is small, when the support bolt 474 is pulled out of the third insertion groove 431, the worm housing 310 is moved in the opposite direction to the upper side, so that the worm And the backlash between the gear teeth of the worm wheel is appropriately large.

The above description exemplarily illustrates the technical idea of the present invention, and those skilled in the art may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 is a block diagram of an active front wheel steering apparatus of a conventional vehicle.

2 is a schematic view showing a gear ratio converter.

Figure 3a is a perspective view of a worm gear backlash control device according to a first embodiment of the present invention.

3B is a front view of the worm gear backlash adjusting device according to the first embodiment of the present invention.

3C is an enlarged view showing modifications of "A" shown in FIG. 3B.

Figure 4a is a perspective view of a worm gear backlash control device according to a second embodiment of the present invention.

Figure 4b is a front view of the worm gear backlash control device according to a second embodiment of the present invention.

4C is a cross-sectional view taken along the line B-B in FIG. 4B.

Figure 5a is a perspective view of the worm gear backlash control device according to an embodiment of the present invention.

Figure 5b is a cross-sectional view of the worm gear backlash control device according to an embodiment of the present invention.

Claims (16)

One side is coupled to the motor, the worm housing and the worm in the inner; A worm housing support disposed in the longitudinal direction of the worm housing, the connecting hole being perforated so that the connecting means can penetrate at one side, and the guide hole penetrating the fixing means at the other side thereof; A worm wheel housing in which the worm housing support is formed on one side of the outer circumference, the worm wheel is in the inner side, and at least one first fastening part is formed at one end; And a worm wheel housing cover formed on an outer circumferential surface of the second fastening portion connected to the first fastening portion and the fastening means and coupled to one end of the worm wheel housing. The worm gear backlash control device according to claim 1, wherein fixing parts to which the fixing means are coupled are formed at both sides of the worm housing. The worm gear backlash adjusting apparatus according to claim 2, wherein a thread is processed on an inner circumferential surface of the fixing part. 4. The worm gear backlash adjusting apparatus according to any one of claims 1 to 3, wherein the fixing means is a stud bolt, and nuts are fastened to both sides thereof. A worm housing having one side coupled to the motor, the worm having an inner circumference, and having a first insertion groove formed at one side and a third insertion groove formed at the other side in the longitudinal direction; A worm housing support disposed in the longitudinal direction of the worm housing, the connecting hole being perforated to allow the connecting means to penetrate at one side thereof; The worm housing support is formed on one side of the outer circumference, the worm wheel is circumferentially formed, and at least one first fastening portion is formed at one end, and the second insertion groove and the fourth insertion groove correspond to the first insertion groove and the third insertion groove. A worm wheel housing each having an insertion groove formed therein; A first elastic member inserted in communication with the first insertion groove and the second insertion groove; A second elastic member inserted in communication with the third insertion groove and the fourth insertion groove; And a worm wheel housing cover formed on an outer circumferential surface of the second fastening portion connected to the first fastening portion and the fastening means and coupled to one end of the worm wheel housing. The worm gear backlash adjusting apparatus according to claim 5, wherein the fourth inserting groove is provided with an adjusting means. 7. The worm gear backlash adjustment according to claim 6, wherein a thread is processed on the inner circumferential surface of the fourth insertion groove, and a thread is processed on the outer circumferential surface of the adjustment means, so that the adjustment means is screwed to the fourth insertion groove. Device. According to claim 6, The other side of the worm housing further comprises a third insertion groove protruding from the worm housing is formed long and having a third insertion groove, the third insertion groove portion is in communication with the third insertion groove A through hole is formed, And a third elastic member disposed between the third insertion groove and the support bolt of the worm housing, the support bolt being screwed to the adjusting means through the through hole. The worm gear backlash adjusting apparatus according to any one of claims 6 to 8, wherein a fitting groove is formed at the center of the adjusting means, and the second elastic member is fitted into the fitting groove. The worm gear backlash adjusting apparatus according to claim 5, wherein both sides of the worm housing protrude from the supporting parts. 11. The worm gear backlash adjusting apparatus according to claim 10, wherein a guide groove is formed on the side opposite to the connection hole in the worm housing support so as to move the support. The worm gear backlash adjusting apparatus according to claim 1 or 5, wherein the connecting means is a pin. The worm gear backlash adjusting apparatus according to claim 1 or 5, wherein the connecting means is a pair of bolts. One side is coupled to the motor, the worm housing and the worm in the inner; A worm housing support disposed in the longitudinal direction of the worm housing, the connecting hole being perforated so that the connecting means can penetrate at one side, and the guide hole penetrating the fixing means at the other side thereof; A worm wheel housing in which the worm housing support is formed on one side of the outer circumference, the worm wheel is in the inner side, and at least one first fastening part is formed at one end; And a worm wheel housing cover formed on an outer circumferential surface of the second fastening portion connected to the first fastening portion and the fastening means, the worm wheel housing cover being coupled to one end of the worm wheel housing. A worm housing having one side coupled to the motor, the worm having an inner circumference, and having a first insertion groove formed at one side and a third insertion groove formed at the other side in the longitudinal direction; A worm housing support disposed in the longitudinal direction of the worm housing, the connecting hole being perforated to allow the connecting means to penetrate at one side thereof; The worm housing support is formed on one side of the outer circumferential surface, the worm wheel is inner circumferentially, at least one first fastening portion is formed at one end, and the second insertion groove and the fourth insertion groove correspond to the first insertion groove and the third insertion groove. A worm wheel housing each having an insertion groove formed therein; A first elastic member inserted in communication with the first insertion groove and the second insertion groove; A second elastic member inserted in communication with the third insertion groove and the fourth insertion groove; And a worm wheel housing cover formed on an outer circumferential surface of the second fastening portion connected to the first fastening portion and the fastening means, the worm wheel housing cover being coupled to one end of the worm wheel housing. The method of claim 15, wherein the fourth insertion groove is provided with an adjustment means, On the other side of the worm housing is further provided with a third insertion groove protruding from the worm housing and formed long and having a third insertion groove, the third insertion groove portion is formed with a through hole communicating with the third insertion groove, Steering device equipped with a worm gear backlash control device comprising a support bolt screwed to the adjustment means through the through hole, and a third elastic member disposed between the third insertion groove portion and the support bolt of the worm housing. .

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