JP5051425B2 - Steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a center take-off type steering device prevented from breakage in a dust cover thereof. <P>SOLUTION: A steering mechanism 5 of this steering device 1 has a rack housing 15 slidably supporting a rack shaft 14 and having a long hole 34, and a cylindrical dust cover 30 covered on the rack housing 15 so as to cover the long hole 34. A slider 38 is fixed to the rack shaft 14, and a tie rod 28 is connected to the slider 38 through a fitting bracket 39. In the condition wherein a projecting part 43 of the slider 38 is passed through a hole 36c of the dust cover 30, the top of the projecting part 43 directly abuts on the bottom 39f of a recessed part 39e provided in the fitting bracket 39. The peripheral edge 36d of the hole 36c of the duct cover 30 is pinched between the fitting bracket 39 and the slider 38 in the periphery of the projecting part 43. The amount of projection of the projecting part 43 is thereby increased to make the dust cover 30 hard to come out of the projecting part 43 in the middle of assembling. Breakage of the dust cover 30 can be thereby prevented. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a steering device.

As the steering device, there is a so-called center take-off type steering device. In this type of steering device, a tie rod connected to a wheel is taken out from a central position in the left-right direction of the vehicle body (see, for example, Patent Documents 1, 2, 3, and 4).
In the steering apparatus described above, the steering mechanism includes a rack shaft and a long cylindrical rack housing that receives the rack shaft. A long hole is formed in an intermediate portion of the rack housing in the longitudinal direction. The rack shaft and the tie rod are connected to each other through the long hole. The long hole is covered with a dust cover.
Japanese Patent Laid-Open No. 10-338156 JP 2000-85602 A JP2000-19844A JP 2001-151120 A

  However, the dust cover may be damaged. This is because in the steering mechanism, a slider is fixed to the rack shaft, and a tie rod is connected to the slider via a mounting bracket. The slider is provided with a convex portion. The tip of the convex portion penetrates the hole of the dust cover, and is fixed to the flat opposing surface of the mounting bracket using a bolt. At the same time, the dust cover is sandwiched between the periphery of the convex portion of the slider and the facing surface of the mounting bracket. On the other hand, when assembling, the dust cover may be caught between the opposing surface of the mounting bracket and the convex portion of the slider, and may be damaged. As a result, foreign matter may enter from the outside.

In addition, when the bolt is tightened and the convex portion and the mounting bracket are fastened with the dust cover being bitten, the bitten dust cover is sag. As a result, the axial force of the bolt is reduced, and the bolt may be loosened or damaged.
SUMMARY OF THE INVENTION An object of the present invention is to provide a steering device that can prevent the dust cover from being damaged, and thus can prevent the bolts from being loosened or damaged.

The present invention relates to a center take-off type power steering apparatus in which a pair of tie rods for turning a wheel in response to a linear displacement of a rack shaft are taken out from a substantially central position in the left-right direction of the vehicle body. Rack housing having a long hole extending in the longitudinal direction, a cylindrical dust cover covering at least the long hole, and attaching the inner end of each tie rod to the rack shaft And a pair of spacers corresponding to each tie rod and a connecting member that connects the pair of spacers to each other, and is interposed between the mounting bracket and the rack shaft, Slider that slides on the inner periphery of the bracket, and a fixed part that is fixed to the rack shaft through the mounting bracket and slider With the door, in a state where the convex portion provided on each spacer is inserted the hole of the dust cover, the top of the convex portion is abutted directly to the bottom of the recess provided in the mounting bracket, the dust cover of the hole The peripheral edge is sandwiched between the mounting bracket and the slider around the convex portion. According to the present invention, since the protruding amount of the convex portion is larger than that in the case where there is no concave portion, the dust cover is difficult to come off from the convex portion during assembly. As a result, it is possible to prevent the detached dust cover from climbing on the convex portion, and thus, it is possible to prevent the dust cover from being damaged. As a result, loosening and breakage of the bolt can be prevented.

Also, if this can be parts of the slider in simple structure is practically constituted less.
In the present invention, the periphery of the hole of the dust cover may be sandwiched between the mounting bracket and the connecting member around the convex portion. In this case, since the dust cover can seal between the connecting member and the spacer, it is possible to prevent the intrusion of foreign matters more reliably.

Further, in the present invention, the upper Symbol connecting member has a pair of insertion holes for inserting the protrusions of the spacers, protrusions of the spacers, if protruding from the connecting member through the corresponding insertion hole of the coupling member There is. In this case, since the dust cover can reliably seal between the connecting member and the spacer, it is possible to prevent the intrusion of foreign matters more reliably.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Although the present embodiment will be described based on the case where the steering device is an electric power steering device, the present invention is not limited thereto, and for example, a steering device for manual steering may be used. FIG. 1 is a schematic diagram showing a schematic configuration of a steering apparatus according to an embodiment of the present invention.
Referring to FIG. 1, a steering device 1 transmits a steering torque applied to a steering wheel 3 as a steering member to steer the wheel 2, and the wheel 2 is driven by the steering torque from the steering shaft 4. The steering mechanism 5 includes, for example, a rack and pinion mechanism for steering, and an intermediate shaft 6 provided between the steering shaft 4 and the steering mechanism 5 and serving as a shaft coupling for transmitting rotation therebetween. .

  The steering shaft 4 is inserted into the steering column 7 and is rotatably supported by the steering column 7. The steering column 7 is supported on the vehicle body 9 via a bracket 8. A steering wheel 3 is connected to one end of the steering shaft 4 and is rotatably supported. An intermediate shaft 6 is connected to the other end of the steering shaft 4.

The intermediate shaft 6 includes a power transmission shaft 10, a universal joint 11 provided at one end of the intermediate shaft 6, and a universal joint 12 provided at the other end of the intermediate shaft 6.
The steering mechanism 5 includes a pinion shaft 13 as an input shaft, a rack shaft 14 as a steered shaft extending in the left-right direction X of the automobile (a direction orthogonal to the straight traveling direction), the pinion shaft 13 and the rack shaft 14. The rack housing 15 is supported. The pinion teeth 13a of the pinion shaft 13 and the rack teeth 14a of the rack shaft 14 mesh with each other.

The pinion shaft 13 is rotatably supported by the rack housing 15. The rack shaft 14 is supported by the rack housing 15 so as to be linearly reciprocable. The rack housing 15 is fixed to the vehicle body 9. The rack shaft 14 is connected to the corresponding wheel 2 via a tie rod 28 and a knuckle arm (not shown) which will be described later.
When the steering wheel 3 is steered, the steering torque is transmitted to the steering mechanism 5 via the steering shaft 4 and the intermediate shaft 6. The rotation is converted into linear motion of the rack shaft 14 along the left-right direction X of the automobile by the pinion teeth 13a and the rack teeth 14a. Thereby, the wheel 2 can be steered.

The steering device 1 can obtain a steering assist force according to the steering torque. That is, the steering device 1 includes a torque sensor 16 that detects steering torque, an ECU (Electronic Control Unit) 17 as a control unit, an electric motor 18 for assisting steering, and a speed reducer 19 as a gear device. And have.
In the present embodiment, the electric motor 18 and the speed reducer 19 are provided in association with the steering column 7.

The steering column 7 has a column tube 20 and a housing 21. A housing 21 accommodates and supports the torque sensor 16, supports the electric motor 18, and constitutes a part of the speed reducer 19.
The steering shaft 4 has an input shaft 22, an output shaft 23, and a torsion bar 24. A lower portion of the steering shaft 4 in the axial direction is divided into an input shaft 22 and an output shaft 23. The input shaft 22 and the output shaft 23 are connected to each other on the same axis via a torsion bar 24. The input shaft 22 is connected to the steering wheel 3 via a connecting shaft 25 as an axial upper portion of the steering shaft 4. The output shaft 23 is connected to the pinion shaft 13 through the intermediate shaft 6. When steering torque is input to the input shaft 22, the torsion bar 24 is elastically torsionally deformed, whereby the input shaft 22 and the output shaft 23 are relatively rotated.

The torque sensor 16 is provided in association with the torsion bar 24 of the steering shaft 4 and detects torque based on the amount of relative rotational displacement between the input shaft 22 and the output shaft 23 via the torsion bar 24. The torque detection result is given to the ECU 17.
The ECU 17 controls the electric motor 18 based on the above torque detection result, a vehicle speed detection result given from a vehicle speed sensor (not shown), and the like.

  The reducer 19 is a reduction mechanism and has a worm gear mechanism as a gear mechanism. This worm gear mechanism has a worm shaft 26 as a drive gear and a worm wheel 27 as a driven gear. The worm shaft 26 is driven by the electric motor 18. The worm shaft 26 is engaged with the worm wheel 27. The worm wheels 27 are fixed to each other so as to rotate integrally with the output shaft 23.

  When the steering wheel 3 is operated, the steering torque is detected by the torque sensor 16, and the electric motor 18 generates a steering assist force according to the torque detection result and the vehicle speed detection result. The steering assist force is transmitted to the pinion shaft 13 via the speed reducer 19, and is transmitted to the steering mechanism 5 along with the movement of the steering wheel 3 to steer the wheel 2. Specifically, the output rotation of the electric motor 18 is transmitted to the pinion shaft 13 via a speed reducer 19 as a transmission device, and is decelerated by the speed reducer 19 during that time. The rotation transmitted to the pinion shaft 13 is converted into a linear motion of the rack shaft 14 to assist steering.

The steering device 1 of the present embodiment is configured as a center take-off type steering device. That is, the pair of tie rods 28 is led out from the center position 9 a in the left-right direction X of the vehicle body 9.
The steering mechanism 5 includes the pinion shaft 13, the rack shaft 14, the rack housing 15, a pair of tie rods 28, a connecting portion 29 that connects the pair of tie rods 28 and the rack shaft 14 to each other, and a dust cover 30. Have.

  Each tie rod 28 is a rod-like connecting member that receives the linear displacement of the rack shaft 14 and steers the wheel 2 along with this, and connects the rack shaft 14 and the corresponding wheel 2 to each other. The outer end 28 a of each tie rod 28 is connected to the wheel 2. An inner end 28 b of each tie rod 28 is disposed at a substantially central position of the vehicle body 9 in the left-right direction X of the vehicle body 9 and is connected to an intermediate portion of the rack shaft 14 in the axial length direction X1 of the rack shaft 14.

FIG. 2 is a partial cross-sectional view of a main part of the steering mechanism 5 of FIG. FIG. 3 is a partial cross-sectional view taken along the line III-III of FIG. FIG. 4 is an exploded perspective view of a main part of the steering mechanism 5.
Referring to FIGS. 1 and 2, the rack shaft 14 has a pair of attachment portions 31 for attaching the connecting portion 29 to an intermediate portion in the axial direction X1. Each attachment portion 31 has a recess 31a that receives a spacer 44 (described later) of the connecting portion 29 in a positioned state, and a screw hole 31c formed in the bottom 31b of the recess 31a. A fixing member 41 (to be described later) of the connecting portion 29 is screwed into the screw hole 31c.

The rack housing 15 supports the rack shaft 14 slidably along the axial length direction X1 of the rack shaft 14.
The rack housing 15 includes a gear housing 32 in which the pinion shaft 13 is accommodated, and a long cylindrical tube portion 33 that is connected to the gear housing 32. The longitudinal direction of the cylindrical portion 33 (also referred to as the longitudinal direction of the rack housing 15) is arranged in parallel to the axial length direction X1 of the rack shaft 14. One end of the cylindrical portion 33 is fixed to the gear housing 32. The cylindrical portion 33 accommodates the rack shaft 14 therein and supports the rack shaft 14. An intermediate portion of the cylindrical portion 33 with respect to the longitudinal direction of the rack housing 15 has a long hole 34.

The long hole 34 extends in the longitudinal direction of the rack housing 15. The connecting portion 29 is passed through the long hole 34. A long hole 34 is formed in accordance with the movement range of the connecting portion 29 so that the connecting portion 29 can move as the rack shaft 14 is displaced in the axial direction X1.
The dust cover 30 has a cylindrical shape extending in one direction. The direction (longitudinal direction) in which the dust cover 30 extends is arranged in parallel to the longitudinal direction of the rack housing 15. The dust cover 30 covers the rack housing 15 so as to surround the rack housing 15 from the periphery, covers the entire intermediate portion of the cylindrical portion 33 with respect to the longitudinal direction of the rack housing 15, and the long hole of the rack housing 15. 34 is covered. The dust cover 30 only needs to cover at least the long hole 34.

The dust cover 30 includes a pair of fixed portions 35 fixed to the cylindrical portion 33 of the rack housing 15, a movable portion 36 that moves along with the connecting portion 29, and a pair of telescopic members that connect the movable portion 36 and the fixed portion 35. And a connecting portion 37. These portions 35, 36, and 37 are arranged in the longitudinal direction of the dust cover 30 and are integrally formed by a rubber member as an elastic member.
The fixed portions 35 are disposed at both ends of the dust cover 30 in the longitudinal direction of the dust cover 30 and are formed in a cylindrical shape.

The connection part 37 is arrange | positioned at the both sides of the movable part 36 about the longitudinal direction of the dust cover 30, is formed in a loose cylindrical shape, and constitutes an expandable / contractible bellows.
The movable portion 36 is disposed at the center of the dust cover 30 in the longitudinal direction of the dust cover 30 and is formed in a cylindrical shape.
Referring to FIGS. 3 and 4, the movable portion 36 includes a curved portion 36 a having an arc shape in cross section, and a flat portion 36 b that connects both arc ends of the curved portion 36 a to each other. The flat portion 36 b faces the attachment portion 31 of the rack shaft 14 through the long hole 34 of the rack housing 15 and covers the long hole 34. The flat part 36b is provided in a part of the movable part 36 in the circumferential direction, and penetrates the flat part 36b inward and outward, and a pair of parallel planes arranged inside and outside the cylindrical part of the movable part 36. And a pair of holes 36c.

  The pair of holes 36 c are provided corresponding to the pair of tie rods 28. The pair of holes 36 c are formed independently of each other and are arranged at a predetermined distance along the axial length direction X <b> 1 of the rack shaft 14. Each hole 36c is formed in a circular shape. The hole 36 c is provided to connect the tie rod 28 and the rack shaft 14 to each other, and is penetrated by a slider 38 and a fixing member 41 described later of the connecting portion 29.

  Referring to FIGS. 2 and 4, the connecting portion 29 is moved integrally with the rack shaft 14, slides on the inner periphery 34 a of the long hole 34 of the rack housing 15, and a pair of tie rods 28 on the slider 38. Mounting bracket 39, a pair of joints 40 that swingably connect the mounting bracket 39 and the pair of tie rods 28, and a plurality of mounting brackets 39 and sliders 38 that are fixed to the rack shaft 14. For example, it has two fixing members 41. The inner end 28 b of the tie rod 28 is connected to the rack shaft 14 via a joint 40, a mounting bracket 39, and a slider 38.

The joint 40 includes a ball and a receiving member having a concave curved shape for receiving the ball, and constitutes a ball joint.
The mounting bracket 39 is provided to attach the inner end 28 b of each tie rod 28 to the rack shaft 14. The mounting bracket 39 has a base portion 39a that faces the slider 38, and an arm portion 39b that protrudes from the base portion 39a.

The arm portion 39 b extends from the base portion 39 a in a direction away from the rack shaft 14. The joint 40 is connected to the arm portion 39b.
The base 39 a is fixed to the slider 38 by a fixing member 41. The base portion 39a includes a pair of insertion holes 39c that penetrate the base portion 39a, a planar contact portion 39d that contacts the dust cover 30, and a recess 39e that is recessed from the contact portion 39d at a predetermined depth. Yes. The recess 39e is circular and has an inner periphery and a bottom 39f. An insertion hole 39c is disposed at the center of the bottom 39f of the recess 39e. The fixing member 41 is inserted through the insertion hole 39c.

  The fixing member 41 passes through the mounting bracket 39 and the slider 38 and is fixed to the rack shaft 14. Specifically, the fixing member 41 is a bolt, and includes a head portion 41a and a shaft portion 41b on which a male screw is formed. The male screw of the shaft portion 41 b of the fixing member 41 is screwed into the screw hole 31 c of the mounting portion 31 of the rack shaft 14. A mounting bracket 39 and a slider 38 are sandwiched between the head 41 a of the fixing member 41 and the bottom 31 b of the recess 31 a of the mounting portion 31 of the rack shaft 14.

The slider 38 is fixed to the mounting portion 31 of the rack shaft 14 so as to move integrally with the rack shaft 14. The slider 38 is interposed between the mounting bracket 39 and the rack shaft 14, and connects the both 14 and 39. The slider 38 holds the movable part 36 of the dust cover 30 so as to be movable together.
The slider 38 includes a first connecting portion 38a that is fixedly connected to the rack shaft 14, a second connecting portion 38b that is fixedly connected to the mounting bracket 39, and an inner periphery 34a of the long hole 34 of the housing. A sliding contact portion 38c that is slidably fitted, a holding portion 38d that faces the mounting bracket 39 and holds the dust cover 30 in a sandwiched state, and an insertion hole 38e through which the fixing member 41 is inserted. Yes.

The slider 38 has a main body portion 42 and two convex portions 43. The two convex portions 43 are formed in the same manner.
The main body portion 42 is disposed closer to the rack shaft 14 than the holding portion 38d, is disposed on the inner side of the inner surface of the flat portion 36b of the movable portion 36 of the dust cover 30, and is formed longer in one direction. . The longitudinal direction of the main body portion 42 is arranged in parallel to the axial length direction X1 of the rack shaft 14. The main body 42 has the first connecting portion 38a, the sliding contact portion 38c, and the holding portion 38d.

  The convex portion 43 is configured by a portion of the slider 38 that is on the tip side of the holding portion 38 d, and is disposed outside the inner surface of the flat portion 36 b of the movable portion 36 of the dust cover 30. It protrudes from the main body 42 in a direction perpendicular to the axial direction X1. The convex part 43 has the 2nd connection part 38b. The convex portion 43 has a cylindrical shape. The axis of the cylinder extends in a direction perpendicular to the axial length direction X1 of the rack shaft 14. The tip of the convex portion 43 is fitted in the concave portion 39 e of the base portion 39 a of the mounting bracket 39.

Specifically, the slider 38 includes a pair of spacers 44 corresponding to each tie rod 28 and a connecting member 45 that connects the pair of spacers 44 to each other. The pair of spacers 44 and the connecting member 45 are formed separately from each other and are combined to constitute the slider 38.
The spacer 44 connects the rack shaft 14 in the rack housing 15 and the base portion 39a of the mounting bracket 39 outside the rack housing 15 so that they can move integrally with each other while being separated from each other. The spacer 44 includes a first portion 44a having a relatively large diameter disposed closer to the rack shaft 14 and a second portion 44b having a relatively smaller diameter disposed closer to the mounting bracket 39 than the first portion 44a. And have. The first portion 44a and the second portion 44b are integrally formed. An insertion hole 38e passes through the first and second portions 44a and 44b.

The first portion 44a has a first connecting portion 38a. The first portion 44 a prevents the rack shaft 14 and the connecting member 45 from rotating around the axis of the fixed member 41 while positioning the rack shaft 14 and the connecting member 45 in the directions close to each other.
The second portion 44b has a second connecting portion 38b. The outer peripheral surface of the second portion 44b is formed in a cylindrical surface. The end portion of the second portion 44b on the side opposite to the first portion 44a is fitted into the recess 39e of the mounting bracket 39 and is in contact with the bottom 39f.

  The connecting member 45 has a pair of annular portions 45b that respectively hold the pair of spacers 44, and a connecting portion 45c that connects the pair of annular portions 45b to each other. Each annular portion 45b has an insertion hole 45a. The distal end portion of the second portion 44b of the spacer 44 as the corresponding convex portion 43 is inserted into each insertion hole 45a. The connecting member 45 has a sliding contact portion 38c and a holding portion 38d.

  With the convex portion 43 provided on the slider 38 passing through the hole 36c of the flat portion 36b of the movable portion 36 of the dust cover 30, a second connecting portion 38b as the top portion of the convex portion 43 is provided on the mounting bracket 39. It is directly abutted against the bottom 39f of the recessed portion 39e. The peripheral edge 36d of the hole 36c of the dust cover 30 is sandwiched between the contact part 39d of the base part 39a of the mounting bracket 39 and the holding part 38d of the connecting member 45 of the slider 38 around the convex part 43. The peripheral edge 36d is elastically deformed and is in close contact with the contact portion 39d and the holding portion 38d. Moreover, the protrusion amount of the convex part 43 is made larger than the thickness dimension of the peripheral edge 36d in an unconstrained state.

  In the present embodiment, in the center take-off type power steering apparatus in which a pair of tie rods 28 for turning the wheel 2 in response to the linear displacement of the rack shaft 14 are taken out from the substantially central position 9a in the left-right direction X of the vehicle body 9. The rack shaft 14 is slidably supported in the axial direction X1 and has a long hole 34 extending in the longitudinal direction (parallel to the left-right direction X). A cylindrical dust cover 30 covering the long hole 34, a mounting bracket 39 for mounting the inner end 28b of each tie rod 28 to the rack shaft 14, and a space between the mounting bracket 39 and the rack shaft 14 are provided. The slider 38 that slides on the inner periphery 34 a of 34, the mounting bracket 39 and the slider 38, is fixed to the rack shaft 14. And a constant-member 41. In a state where the convex portion 43 provided on the slider 38 is inserted through the hole 36c of the dust cover 30, the second connecting portion 38b as the top portion of the convex portion 43 is directly on the bottom 39f of the concave portion 39e provided on the mounting bracket 39. It has been hit. A peripheral edge 36 d of the hole 36 c of the dust cover 30 is sandwiched between the mounting bracket 39 and the slider 38 around the convex portion 43.

  According to this embodiment, since the protrusion amount of the convex part 43 is large compared with the case where there is no recessed part 39e, the dust cover 30 becomes difficult to remove | deviate from the convex part 43 in the middle of an assembly. As a result, it is possible to prevent the detached dust cover 30 from climbing on the convex portion 43, and to prevent the dust cover 30 from being bitten by the fixing member 41 being attached to the convex portion 43, thereby preventing the dust cover 30 from being damaged. It is possible to prevent foreign matter from entering due to this breakage, and that the dust cover 30 that has been bitten and the fixing member 41 from being loosened or broken can be prevented.

In the present embodiment, the slider 38 connects the pair of spacers 44 corresponding to each tie rod 28 and the pair of spacers 44 to each other, and the connecting member 45 slides on the inner periphery 34 a of the long hole 34 of the rack housing 15. And so on. In this case, the slider 38 can be constructed practically with a simple structure and a small number of parts.
In the present embodiment, the peripheral edge 36 d of the hole 36 c of the dust cover 30 is sandwiched between the mounting bracket 39 and the connecting member 45 around the convex portion 43. In this case, since the dust cover 30 can seal between the connecting member 45 and the spacer 44, the entry of foreign matter can be more reliably prevented.

  The convex portions 43 are provided in the spacers 44, and the connecting member 45 has a pair of insertion holes 45 a through which the convex portions 43 of the spacers 44 are inserted. The convex portions 43 of the spacers 44 are connected to the connecting members 45. It protrudes from the connecting member 45 through the corresponding insertion hole 45a. In this case, the dust cover 30 can reliably seal the gap between the connecting member 45 and the spacer 44, so that the intrusion of foreign matter can be more reliably prevented.

Moreover, the following modifications can be considered about this embodiment. In the following description, differences from the above-described embodiment will be mainly described, and the same components are denoted by the same reference numerals and description thereof is omitted.
For example, although the above-described steering device 1 uses an electric motor as a drive source for obtaining a steering assist force, a hydraulic power cylinder as a hydraulic actuator may be used. Further, a drive source for obtaining a steering assist force may be provided in the rack housing 15 in addition to the steering column 7. In addition, various design changes can be made within the scope of matters described in the claims.

It is a mimetic diagram showing a schematic structure of a steering device of one embodiment of the present invention. FIG. 4 is a partial cross-sectional view of a main part of the steering mechanism of FIG. 1, showing a II-II cross section of FIG. 3. FIG. 3 is a partial cross-sectional view taken along the line III-III in FIG. 2. It is a disassembled perspective view of the principal part of the steering mechanism of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Steering device, 2 ... Wheel, 9 ... Vehicle body, 9a ... Center position, 14 ... Rack shaft, 15 ... Rack housing, 28 ... Tie rod, 28b ... Inner end (of tie rod), 30 ... Dust cover, 34 ... Long hole 34a ... (long hole) inner periphery, 36c ... (dust cover hole) hole, 36d ... (dust cover hole hole), 38 ... slider, 38b ... second connection part (top part of convex part), 39 ... mounting bracket, 39e ... concave portion (of mounting bracket), 39f ... bottom of concave portion of mounting bracket, 41 ... fixing member, 43 ... convex portion, 44 ... spacer, 45 ... connecting member, 45a ... insertion hole, X ... Left-right direction of the vehicle body (longitudinal direction of the rack housing), X1 ... axial length direction

Claims (3)

In a center take-off type power steering device in which a pair of tie rods for turning a wheel in response to a linear displacement of a rack shaft is taken out from a substantially central position in the left-right direction of the vehicle body,
A rack housing that slidably supports the rack shaft in the axial direction and has a long hole extending in the longitudinal direction;
A cylindrical dust cover that covers the rack housing and covers at least the elongated hole;
A mounting bracket for mounting the inner end of each tie rod to the rack shaft;
It is configured by combining a pair of spacers corresponding to each tie rod and a connecting member for connecting the pair of spacers to each other, and is interposed between the mounting bracket and the rack shaft, and slides on the inner periphery of the long hole. A slider to
A fixing member that passes through the mounting bracket and the slider and is fixed to the rack shaft,
With the convex portion provided in each spacer inserted through the hole of the dust cover, the top of the convex portion is directly abutted against the bottom of the concave portion provided in the mounting bracket,
A steering device characterized in that the periphery of the hole of the dust cover is sandwiched between the mounting bracket and the slider around the convex portion. 2. The steering apparatus according to claim 1, wherein a peripheral edge of the hole of the dust cover is sandwiched between the mounting bracket and the connecting member around the convex portion. In claim 2 ,
Upper Symbol connecting member has a pair of insertion holes for inserting the protrusions of the spacers,
The convex part of each spacer protrudes from the connection member through the corresponding insertion hole of the connection member.

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