JP3495431B2 - Rack support equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a device suitable for supporting a rack of a rack and pinion type steering device.

[0002]

2. Description of the Related Art In a rack and pinion type steering device, a pinion that rotates by a steering input and a rack that meshes with the pinion are provided, and steering wheels are steered by the reciprocating movement of the rack. FIG. 8A shows a conventional supporting device that supports the rack 101. The support device includes a rack guide 104 that is inserted into a guide hole 103 formed in the rack housing 102 and is guided forward and backward (left and right in the drawing) by an inner peripheral surface of the guide hole 103. The inner peripheral surface of the guide hole 103 is arranged on an imaginary first cylindrical surface having an axis along the front-rear direction.
The outer peripheral surface of the rack guide 104 can be arranged on a virtual second cylindrical surface having an axis smaller than the first cylindrical surface and extending in the front-rear direction.

The rack guide 104 is composed of a pair of divided pieces 104a and 104b (in the direction perpendicular to the axis of the rack 101 and parallel to the radial direction of the rack guide 104) in the figure, and the front end side of each divided piece 104a and 104b. Thus, the back side of the rack 101 is supported via the seat 105. Both split pieces 1 are provided on the rear end side of the rack guide 104.
A concave portion 106 is formed extending over 04a and 104b, and a pressure receiving surface 106a is formed in the concave portion 106. The pressure receiving surface 106a extends along a conical surface that inclines toward the inner peripheral surface of the guide hole 103 as it goes rearward. The pressure receiving surface 106
The pressing member 107 is brought into contact with a through the outer peripheral surface 107a along the spherical surface. A spring 108 for exerting an elastic force on both of the divided pieces 104a and 104b via the pressing member 107.
Are supported on the housing 102 side. The spring 10
The elastic force of No. 8 is inclined toward the inner peripheral surface of the guide hole 103 as the pressure receiving surface 106a moves rearward,
It is divided into a component force that pushes both of the divided pieces 104a and 104b against the back surface of the rack 101 and a component force that presses against the inner peripheral surface of the guide hole 103. A restricting member 109 is attached to the housing 102 side behind the pressing member 107 with a changeable adjustable gap δ. The limiting member 109 contacts the pressing member 107, whereby the rack guide 1
The moving distance of 04 to the rack 101 to the rear is limited to the set range.

The elastic force of the spring 108 presses the teeth of the rack 101 against the teeth of the pinion via the rack guide 104 to eliminate backlash and achieve smooth rotation transmission, and the rack guide 104 reciprocates back and forth. By moving, the bending of the rack 101 and the machining tolerance at the time of gear cutting are absorbed. The moving distance of the rack guide 104 with respect to the rack 101 is pressed against the pressing member 10.
By limiting the setting range by the limiting member 109 via 7, the rack 101 due to the excessive movement distance
Prevents poor meshing with the pinion. By pressing the divided pieces 104a and 104b against the inner peripheral surface of the guide hole 103, rattling of the rack guide 104 is prevented,
It is prevented that the followability of the movement of the rack with respect to the rotation of the pinion 101 is deteriorated and the collision noise between the teeth of the rack 101 and the teeth of the pinion is increased.

[0005]

In the conventional rack supporting apparatus, the followability of the movement of the rack to the rotation of the pinion is deteriorated, the collision noise between the teeth of the rack and the teeth of the pinion is increased, and the pinion is moved. There is a problem in that the torque required to rotate the motor varies from the set value and increases. In the rack and pinion type steering device, this causes deterioration of steering feeling and abnormal noise.

The followings have been clarified as the causes of the problems in the conventional rack supporting device.

In the conventional supporting device, the pressure receiving surface 106a of the rack guide 104 is along the conical surface, and the pressure receiving surface 1
The outer peripheral surface 107 of the pressing member 107 that is brought into contact with 06a
Since a is along the spherical surface, the pressure receiving surface 106a and the outer peripheral surface 10
The contact point with 7a is along the circumference. Therefore, the rack guide 104 easily rotates along the pressing member 107. Then, the rack 10 by the rack guide 104
The support of No. 1 becomes unstable, the followability of the movement of the rack 101 with respect to the rotation of the pinion deteriorates, and the collision noise between the teeth of the rack 101 and the teeth of the pinion becomes loud.

Further, since the pressure receiving surface 106a of the rack guide 104 and the outer peripheral surface 107a of the pressing member 107 have a processing tolerance, they do not come into uniform contact with each other. Therefore, the component force of the elastic force of the spring 108 that presses each of the divided pieces 104a and 104b against the inner peripheral surface of the guide hole 103 acts not only in the vertical direction. Further, the inner peripheral surface of the guide hole 103 is arranged on the virtual first cylindrical surface of the axial center along the front-rear direction,
Since the outer peripheral surface of the rack guide 104 can be arranged on the virtual second cylindrical surface having a smaller diameter and a coaxial center than the virtual first cylindrical surface, the divided pieces 104a, 1a constituting the rack guide 104 are arranged.
When 04b is pressed against the inner peripheral surface of the guide hole 103 by the elastic force of the spring 108, as shown in (2) of FIG.
The outer peripheral surface of each of the divided pieces 104a and 104b makes line contact with the inner peripheral surface of the guide hole 103 only at one place, and the outer peripheral surface of each of the divided pieces 104a and 104b and the inner peripheral surface of the guide hole 103 except the contact point. A gap w is formed between them.
Therefore, the divided pieces 104a and 104b are attached to the guide hole 103.
When the component force of the elastic force of the spring 108 pressed against the inner peripheral surface of the above acts on the inner peripheral surface of the guide hole 103 when the size of the divided pieces 104a and 104b fluctuates, as described above. An attempt is made to rotate the contact point P as a starting point as indicated by an arrow in the figure. Therefore, the support of the rack 101 by the rack guide 104 becomes unstable, and the followability of the movement of the rack 101 with respect to the rotation of the pinion deteriorates.
The collision noise between the teeth of the rack 101 and the teeth of the pinion becomes loud. Particularly, when the inner peripheral surface of the guide hole 103 and the outer peripheral surface of the rack guide 104 are worn due to long-term use, the gap between the inner and outer peripheral surfaces becomes large, so that the support of the rack 101 becomes unstable.

Further, in the conventional supporting device, the force pressing the divided pieces 104a, 104b against the rack 101 and the reaction force acting on the divided pieces 104a, 104b from the rack 101 act on the divided pieces 104a, 104b. It becomes a couple to do. Further, when the rack 101 is displaced forward (to the left in FIG. 8), the divided pieces 104a and 104b tend to be displaced forward by the elastic force of the spring 108 following the displacement. However, when the displacement of the rack 101 is abrupt, a follow-up delay occurs due to friction between the outer circumference of each of the divided pieces 104a and 104b and the inner circumference of the guide hole 103, and the follow-up delay causes the back surface of the rack 101 and both of the divided pieces 104 to move.
A gap is formed between the a and 104b. Further, in the state of being pressed against the inner peripheral surface of the guide hole 103, there is a gap between the divided pieces 104a and 104b. Then, when the couple acts on each of the divided pieces 104a and 104b as described above, the both divided pieces 104a and 104b, which are prevented from being displaced forward by the friction thereof, are inclined as shown in FIG. The distance from the inner peripheral surface of the hole 103 is larger on the rear end side than on the front end side. When such an inclination of the divided pieces 104a and 104b occurs, the pressing member 1
Since 07 is in contact with the pressure receiving surface 106a inclined toward the inner peripheral surface of the guide hole 103 as it goes rearward,
It is displaced rearward, and the gap δ between the pressing member 107 and the limiting member 109 becomes smaller than the set amount. Therefore, the rearward displacement of the rack guide 104 is blocked by the limiting member 109 with a value smaller than the set amount, and the rack 10
1 is pressed against the pinion with a force larger than the desired value, and the torque required to rotate the pinion fluctuates from the desired set value and increases. In addition, each divided piece 104
When the rear ends of the a and 104b are separated from the inner peripheral surface of the guide hole 103, the rattling of the rack guide 104 reduces the followability of the movement of the rack 101 with respect to the rotation of the pinion, and the teeth of the rack 101 and the pinion. The sound of collision with teeth becomes loud. In particular, when the conventional support device is used in the rack and pinion type steering device for a long period of time, the portion of the back surface of the rack 101 supported by the rack guide 104 in the straight-ahead state is closer to the rack guide 104 in the cornering state. Since the amount of wear is larger than that of the supported portion, the forward displacement of the rack 101 becomes steep when steering from the cornering state to the straight-ahead state, and the steering feeling is degraded and abnormal noise is likely to occur.

It is an object of the present invention to provide a rack supporting device which can solve the above problems of the prior art.

[0011]

The present invention SUMMARY OF THE INVENTION includes a rack guide that supports the rack, and a spring for biasing said La <br/> click through the rack guide pinion, said spring and pre
Serial A supporting apparatus of a rack with a pressing and members are disposed between the rack guide, the rack guide,
Respective segments is divided into a plurality as urged radially outwardly of the rack guide by the elastic force of the spring, each
Each of the divided pieces has a pressure receiving surface, and each of the pressure receiving surfaces is
The pressing member is pressed by the elastic force of the spring
It is, the pressing each pressure receiving surface each pressing part due member, and perpendicular to the axial direction of the rack guide
Characterized in that it is a line segment which is skewed to the rack guide center axis.

[0012] The rack guide, the so each divided piece is biased in a direction perpendicular to the axial direction of the rack guide and the rack comprising a radially outwardly of by the elastic force of the <br/> spring 2 is divided into the LA in one of the divided pieces
And the pressure receiving surface on the pressing member.
The place to be pressed more is in the axial direction of the rack.
On a plane parallel and parallel to the axial direction of the rack guide
Yes, and supports the rack in the other split piece.
And places said pressure receiving surface and portions of lifting is pressed by the pressing member, and parallel to the axial direction of the rack
It is preferably on a plane parallel to the axial direction of the rack guide.

[0013]

According to the structure of the present invention, since the position where the pressing member presses the rack guide is along the line perpendicular to the axial direction of the rack guide, the rack guide can be easily moved along the pressing member. It does not rotate. As a result, the rack support by the rack guide is stable, the followability of the movement of the rack with respect to the rotation of the pinion is lowered, and the collision noise between the teeth of the rack and the teeth of the pinion can be prevented from increasing.

Further, the rack guide is divided into two, and each divided piece is urged by the elastic force of the spring in the radial direction outward of the rack guide and in the direction perpendicular to the axial direction of the rack, and each divided piece. The rack on each of the divided pieces is such that the piece supporting the rack and the portion pressed by the pressing member are on a plane parallel to the axial direction of the rack and parallel to the axial direction of the rack guide. The support location of and the location of pressing by the pressing member are juxtaposed along the axial direction of the rack guide. As a result, the force pressing one of the divided pieces toward the rack and the reaction force acting on the one divided piece from the rack cancel each other out,
It does not create a couple. Similarly, the force pressing the other divided piece toward the rack and the reaction force acting on the other divided piece from the rack cancel each other out, and a couple is not generated. Therefore, the inclination of both divided pieces unlike the conventional case does not occur. As a result, the gap between the pressing member and the limiting member does not become smaller than the set amount, and it is possible to prevent the torque required to rotate the pinion from largely changing from the desired set value. Further, since the rattling of the rack guide can be reduced, it is possible to prevent the followability of the movement of the rack with respect to the rotation of the pinion from being deteriorated and the collision noise between the teeth of the rack and the teeth of the pinion from increasing.

Further, when the two-divided rack guide is inserted into the guide hole formed in the housing and is guided in the axial direction of the rack guide by the inner peripheral surface of the guide hole, each divided piece is pressed by the pressing member. By arranging the parts to be pressed by a line parallel to the axial direction of the rack, the component force of the elastic force of the spring that presses each divided piece against the inner peripheral surface of the guide hole can be applied to the outside of the rack guide in the radial direction. It can only act in a direction perpendicular to the rack axis. As a result, even if the magnitude of the component force of the elastic force of the spring changes, each divided piece does not rotate starting from the contact point with the inner peripheral surface of the guide hole, and the rack guide supports the rack. Stabilization can be achieved. Therefore,
It is possible to prevent the followability of the movement of the rack with respect to the rotation of the pinion from being deteriorated and the collision noise between the teeth of the rack and the teeth of the pinion from increasing.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. The rack and pinion type steering device shown in FIG. 1 is a helical pinion 1 connected to a steering wheel of a vehicle.
1, a helical rack 2 having teeth 2a meshing with the teeth of the pinion 1 formed on the left side in FIG. 1, and a housing 3 covering the rack 2. The pinion 1 is supported by the housing 3 via bearings 12 and 13. Steering wheels are connected to both ends of the rack 2, and the vehicle is steered by moving the rack 2 in the vehicle width direction by rotation of the pinion 1 by a steering operation.

A guide hole 6 formed in the housing 3
3, a support yoke (rack guide) 4 made of sintered metal, which is also shown in FIG.
The support yoke 4 is guided in the front-rear direction by the inner peripheral surface of the. In this embodiment, the front means the guide hole 6
The support yoke 4 guided by the inner peripheral surface of the rack 2
Is the direction closer to, and is the left side in FIG. The front-back direction is perpendicular to the rotation axis of the pinion 1 and the axis of the rack 2. The inner peripheral surface of the guide hole 6 is arranged on an imaginary first cylindrical surface having an axis in the front-rear direction. Between the front end surface of the support yoke 4 and the back surface of the rack 2, as shown in FIGS.
Further, the hard synthetic resin sheet 5 having elasticity shown in FIG. 7 is interposed.

The rear surface of the rack 2 and the support yoke 4
The front end face 4'of the seat 5 and the front face 5'and the back face of the seat 5 are
The rack 2 is arranged on a virtual cylindrical surface having an axis along the axial direction. The radius of the virtual cylindrical surface on which the front surface 5'of the seat 5 is arranged is made larger than the radius of the virtual cylindrical surface on which the rear surface of the rack 2 is arranged, and the back surface of the seat 5 and the support yoke 4 are supported. The surface 4'is arranged on the same virtual cylindrical surface. The back surface of the rack 2 is directly supported by the front surface 5 ′ of the seat 5, and the back surface of the rack 2 is supported by the front end surface 4 ′ of the support yoke 4 via the seat 5. As a result, the front end surface 4'of the support yoke 4 is
Is a support surface for supporting the rack 2 via the seat 5, and the support surface 4'is inclined toward the inner peripheral surface of the guide hole 6 as it goes forward. Further, the radius of the virtual cylindrical surface on which the front surface 5'of the seat 5 is arranged is larger than the radius of the virtual cylindrical surface on which the back surface of the rack 2 is arranged.
The front surface 5'of the seat 5 supports the back surface of the rack 2 at two points, and each of the support points is along a line parallel to the axial direction of the rack 2. The back of the seat 5 is the support yoke 4
The support yoke 4 supports the rack 2 at two points on the support surface 4'along the line parallel to the axial direction of the rack 2 because the support yoke 4 makes surface contact with the support surface 4 '. As shown in FIG. 3, a horizontal groove 4a and a vertical groove 4b are formed in a cross shape on the support surface 4'of the support yoke 4, and the cross-shaped convex portions 5a and 5b are fitted in the grooves 4a and 4b. Is formed on the back surface of the seat 5.

As shown in FIG. 4, the support yoke 4 is composed of a pair of upper and lower divided pieces 20, 21. The front end side of each divided piece 20, 21 constitutes the supporting surface 4 ', and the supporting surface 4 One of the support points of the rack 2 on the ′ is arranged on the one divided piece 20, and the other support point is arranged on the other divided piece 20. In the present embodiment, the up-down direction means a direction that is perpendicular to the axis of the rack 2 and is parallel to the plane including the axis of the pinion 1. As shown in FIG. 3, the outer peripheral surface 4k of the support yoke 4 constitutes a cylindrical surface with the surfaces 20a, 21a of the two divided pieces 20, 21 facing each other joined, and the outer peripheral surface 4k of the virtual first The support yoke 4 can be arranged on a virtual second cylindrical surface having a smaller diameter and a coaxial center than the cylindrical surface, whereby the axial direction of the support yoke 4 is parallel to the front-rear direction and the radial direction is perpendicular to the front-rear direction. There is.

As shown in FIG. 5, the facing surfaces 20a, 21a of the split pieces 20, 21 are located along the upper edge of the lateral groove 4a on the left side in FIG. 5, and on the right side thereof.
It is supposed to cross the lateral groove 4a at the center along the lower edge of the. Elongated elongated holes 23 and 24 are formed vertically from the bottom of the lateral groove 4a toward the rear. Sheet 5
A pair of cylindrical protrusions 25, 26 projecting rearward from the convex portion 5a are formed on the back surface of the. One of the cylindrical protrusions 25 is fitted in the elongated hole 23 of the one divided piece 20 so as to be movable in the longitudinal direction, and the other cylindrical protrusion 26 is moved in the elongated hole 24 of the other divided piece 21 in the longitudinal direction. It is possible to be fitted. As a result, the respective divided pieces 20, 21 are movable with respect to the sheet 5 toward the inner peripheral surface of the guide hole 6. The diameter of each cylindrical projection 25, 26 is made slightly larger than the minor diameter of each long hole 23, 24, so that the seat 5 is prevented from falling off from the support yoke 4.

On the rear end side of the support yoke 4, there is formed a recess 4 "extending over both of the split pieces 20 and 21. As shown in (1) and (2) of FIG. , An inner peripheral surface 4f arranged on a virtual cylindrical surface coaxial with the virtual first and second cylindrical surfaces, a bottom surface 4g along the vertical direction, and a pressure receiving surface 4c formed by recessing the bottom surface 4g. Have and. The pressure receiving surface 4c moves upward from the front edge along the axial direction of the rack 2 as it goes rearward, and thus the guide hole 6 is formed.
And a flat surface 4c 'that is inclined toward the inner peripheral surface of the guide hole 6 by going downward from the front edge 4c' toward the rear. It

A metal pressing member 9 and a compression coil spring 8 are inserted into the recess 4 ". The pressing member 9 has a disk-shaped portion 9a as shown in FIG.
And a protruding portion 9b protruding forward from the disc-shaped portion 9a. The outer surface of the protruding portion 9b is a convex curved surface that is parallel to the axis of the rack 2 and extends rearward toward the inner peripheral surface of the guide hole 6, and the curvature thereof increases as it extends rearward. The spring 8 is attached to the disk-shaped portion 9a of the pressing member 9.
Of the spring 8 is brought into contact with the cover 7 attached to the housing 3, whereby an elastic force acts on the support yoke 4 via the pressing member 9.

Due to the elastic force of the spring 8, the pressing member 9
The outer surface of the protruding portion 9b is pressed against the pressure receiving surface 4c at two positions, and each pressing position is along a line parallel to the axial direction of the rack 2 (indicated by a chain line L1 and L2 in (2) of FIG. 2). Along the line perpendicular to the axial direction of the support yoke 4, one pressing point is arranged on one split piece 20, and the other pressing point is arranged on the other split piece 21. Further, the supporting point of the rack 2 on the supporting surface 4'of one of the divided pieces 20 (Q in (1) of FIG.
2) and a pressing portion by the pressing member 9 on the pressure receiving surface 4c (indicated by R in (1) of FIG. 2) are juxtaposed in the front-rear direction, and a line connecting the supporting portion and the pressing portion ((1 of FIG. 2)). (Indicated by a broken line S in FIG. 4) is perpendicular to the vertical direction, and therefore, the place Q where one of the divided pieces 20 supports the rack 2 and the place R where the pressing member 9 presses the parallel piece 20 are parallel to the axial direction of the rack 2. It is also on a plane parallel to the axial direction of the support yoke 4. Also, the other divided piece 2
1, a supporting portion of the rack 2 on the supporting surface 4 '(indicated by T in (1) of FIG. 2) and a pressing portion of the pressing member 9 on the pressure receiving surface 4c (indicated by U in (1) of FIG. 2). Are juxtaposed in the front-rear direction, and a line connecting the supporting point and the pressing point (indicated by a broken line V in (1) of FIG. 2) is perpendicular to the vertical direction, so that the other divided piece 21 supports the rack 2. The point T to be applied and the point U to be pressed by the pressing member 9 are on a plane parallel to the axial direction of the rack 2 and parallel to the axial direction of the support yoke 4.

As a result, the elastic force of the spring 8 and the component force that urges the rack 2 toward the pinion 1 by pressing the split pieces 20 and 21 against the back surface of the rack 2 via the pressing member 9, Both the divided pieces 2 through the pressing member 9
0 and 21 are radially outward of the support yoke 4 and the rack 2
And a component force for pressing the inner peripheral surface of the guide hole 6 by urging it in the vertical direction which is a direction perpendicular to the axial direction of the guide hole 6. The component force that presses the one divided piece 20 against the inner peripheral surface of the guide hole 6 acts only in the upward direction, and the component force that presses the other divided piece 21 against the inner peripheral surface of the guide hole 6 acts only in the downward direction. Further, the component force of pressing the one divided piece 20 toward the rear surface of the rack 2 and the reaction force acting on the one divided piece 20 from the rack 2 cancel each other out, and similarly, the other divided piece 21 is made to the rear surface of the rack 2. Since the component force pressing against each other and the reaction force acting from the rack 2 to the other divided piece 21 cancel each other, no moment acts on each divided piece 20, 21.

An adjusting screw (restricting member) 10 arranged behind the pressing member 9 with a gap δ is screwed into the cover 7. The gap δ can be changed by rotating the adjusting screw 10. A lock nut 11 is screwed onto the adjusting screw 10. When the adjusting screw 10 contacts the pressing member 9, the rearward movement distance of the support yoke 4 with respect to the rack 2 is limited to the set range.

According to the above structure, the support yoke 4 presses the teeth of the rack 2 against the teeth of the pinion 1,
Eliminates backlash and achieves smooth rotation transmission.
The support yoke 4 reciprocates in the front-rear direction to absorb bending of the rack 2 and machining tolerances during gear cutting. By limiting the rearward movement distance of the support yoke 4 with respect to the rack 2 to a set range, a defective meshing between the rack 2 and the pinion 1 due to the excessive movement distance is prevented.

Further, since the pressing portion of the support yoke 4 by the pressing member 9 is along the lines L1 and L2 perpendicular to the axial direction of the support yoke 4, the support yoke 4 can easily rotate along the pressing member 9. There is no. As a result, the support of the rack 2 by the support yoke 4 is stabilized, the followability of the movement of the rack 2 with respect to the rotation of the pinion 1 is reduced, and the collision noise between the teeth of the pinion 1 and the teeth of the rack 2 becomes large. It can be prevented.

Further, since the pair of upper and lower divided pieces 20, 21 are pressed against the inner peripheral surface of the guide hole 6 by the force acting only in the vertical direction, even if the magnitude of the force changes, the divided pieces 20, 21 21 does not rotate from the contact point with the inner peripheral surface of the guide hole 6 as a starting point, and even if the inner peripheral surface of the guide hole 6 or the outer peripheral surface of the support yoke 4 is worn due to long-term use,
The support of the rack 2 by the support yoke 4 can be stabilized. Accordingly, it is possible to prevent the followability of the movement of the rack 2 with respect to the rotation of the pinion 1 from being deteriorated and the collision noise between the teeth of the rack 2 and the teeth of the pinion 1 from increasing.

Furthermore, since no moment acts on each of the divided pieces 20 and 21, the inclination of the divided pieces 20 and 21 does not occur. As a result, the gap between the pressing member 9 and the adjusting screw 10 does not become smaller than the set amount, and it is possible to prevent the torque required to rotate the pinion 1 from largely changing from the desired set value. Further, since the rattling of the support yoke 4 can be reduced, the followability of the movement of the rack 2 with respect to the rotation of the pinion 1 is prevented from being lowered, and the collision noise between the teeth of the rack 2 and the teeth of the pinion 1 is prevented from increasing. it can. Therefore, after being used for a long period of time, the portion of the back surface of the rack 2 that is pressed against the support yoke 4 in the straight-ahead state is more worn than the portion that is pressed against the support yoke 4 in the cornering state, and from the cornering state to the straight-ahead state. Even if the forward displacement of the support yoke 4 becomes sharp when the steering wheel is steered, it is possible to prevent the steering feeling from being deteriorated and the abnormal noise from being generated.

[Brief description of drawings]

FIG. 1 is a sectional view of a rack supporting device according to an embodiment of the present invention.

2 is a sectional view of a rack, a support yoke and a pressing member, (2) is a rear view of the support yoke and the pressing member, and (3) is a perspective view of the pressing member 9. FIG.

FIG. 3 is a perspective view of a support yoke and a seat of the embodiment.

FIG. 4 is a perspective view of a support yoke of the embodiment.

FIG. 5 is a front view of a support yoke of the embodiment.

FIG. 6 is a side view of the seat of the embodiment.

FIG. 7 is a rear view of the seat of the embodiment.

FIG. 8 is a sectional view of (1) of a conventional rack supporting device,
(2) is a rear sectional view for explaining the problem

FIG. 9 is a sectional view for explaining a problem of a conventional rack supporting device.

[Explanation of symbols]

1 pinion 2 racks 3 housing 4 Support yoke (rack guide) 4c Pressure receiving surface 6 guide holes 8 springs 9, pressing member 10 Adjustment screw (restriction member) 20, 21 split pieces

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-6-56042 (JP, A) JP-A-6-92243 (JP, A) JP-A-6-137396 (JP, A) JP-A-6- 64549 (JP, A) Actual exploitation Sho 57-159056 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 3/12

Claims (2)

(57) [Claims] Comprising a rack guide that supports the claim 1 rack, and a spring for urging the pinion of the rack through the rack guide, the pressing and the member is disposed between the rack guide and the spring a support device of the rack, the rack guide, the rack guide is divided into a plurality as biased radially outwardly, each of the respective segments is receiving the divided pieces by the elastic force of the spring And a pressing member is provided on each of the pressure receiving surfaces.
Pressed by the elastic force, the pressing portion pressing of each of the respective pressure receiving surface by member is with the rack guide segment axially is skewed to the vertical and the La <br/> Kkugaido central axis A rack supporting device characterized in that Wherein said rack guide is biased the direction perpendicular to the axial direction of the rack guide and the rack comprising a radially outwardly of by the elastic force of the respective segments are the <br/> spring So that the rack is supported in one of the divided pieces.
The pressure receiving surface is pressed by the pressing member.
The location is parallel to the axial direction of the rack and the rack
Id on a plane parallel to the axial direction of the id and in front of the other
Location of the divided piece supporting the rack and the pressure receiving
Where the surface is pressed by the pressing member,
Claim 1, characterized in that on one plane parallel to the axial direction of parallel and the rack guide in the axial direction of the rack
Rack supporting device according to.