JP2008126715A - Rack bushing for rack/pinion type steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rack bushing for a rack/pinion type steering device in which a projection of the rack bushing is hardly removed from an engagement groove of a rack housing. <P>SOLUTION: In an approximately cylindrical body 11a, three segments 11a1-11a3 are formed by slits 11c1-11c3, and the adjacent segments 11a1 and 11a2, 11a1 and 11a3, and 11a2 and 11a3 are mutually connected by thin portions 11cx, 11cy, 11cz formed on a slit bottom surface respectively. Projections 12b1-12b3 are formed at an opposite side to a ring part 13d for connecting the segments and are engaged with an engagement groove of the rack housing. The segments of the rack bushing 10 are mutually connected by the thin portions formed on the bottom surface of the slit, thereby, rigidity of the bushing 10 is enhanced and fitting of the projection and the engagement groove is made sure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rack and pinion type steering apparatus for a vehicle, and more particularly to a rack bush for holding a rack shaft in a rack housing.

  As a steering device for a vehicle, a rack and pinion type steering device that converts a rotational motion transmitted from a steering wheel into an axial motion of a rack shaft by a rack and pinion mechanism is widely used.

  In such a rack and pinion type steering device, the rack shaft is housed in a rack housing and is configured to be held by a vehicle body frame (not shown). A rack made of synthetic resin is used to hold the rack shaft in the rack housing. Bush is used.

  The rack bush is formed with a plurality of raised portions on the inner peripheral portion, and the rack shaft is slidably held in the axial direction by the formed raised portions. The rack bush is provided with a protrusion for mounting to the rack housing, and the rack bush is mounted on the rack housing by engaging the protrusion with a locking groove provided near the end of the rack housing. After the rack bush is mounted on the rack housing, the rack shaft is inserted into the rack bush and attached to the rack housing.

  In order to make it easy to mount the rack bushing to the rack housing, and because the rack bushing is made of synthetic resin, to prevent “sagging” (deformation) caused by heat, The thing in which the some slit extended was proposed (refer patent document 1).

  FIG. 10 is a diagram for explaining the external appearance of a rack and pinion type steering apparatus 100 that accommodates a conventional rack shaft 102, and FIG. 11 is a cross-sectional view of a rack housing 101 that accommodates the conventional rack shaft 102, in the vicinity of the rack bush 103. 12 is a cross-sectional view illustrating a configuration of a conventional rack housing 101. FIG.

  13A and 13B are diagrams for explaining the configuration of a conventional rack bush 103. FIG. 13A is a front view of the rack bush 103, and FIG. 13B is a cross-sectional view taken along line AA in FIG. FIG. 13C is a cross-sectional view taken along the line BB in FIG.

  In FIG. 10, 101 is a rack housing, 102 is a rack shaft housed inside the rack housing 101, and the rack shaft 102 is housed inside the rack housing by a rack bush 103 so as to be slidable in the axial direction.

  The configuration of the rack bush 103 will be described with reference to FIG. The rack bush 103 is generally formed in a substantially cylindrical shape, and the substantially cylindrical main body 103a is formed by three slits 103c1, 103c2, and 103c3 that are formed at intervals of 120 ° and extend sufficiently long in the cylindrical axis direction. Segments 103a1, 103a2, and 103a3. A ring portion 103d is formed at the tip of each of the divided segments 103a1 to 103a3, and the segments are connected to each other.

  The three segments 103a1, 103a2, and 103a3 of the substantially cylindrical main body 103a are respectively formed with three protrusions 104a1, 104a2, and 104a3 at intervals of 120 ° on the side opposite to the ring portion 103d that connects the segments. Has been. The three slits 103c1 to 103c3 and the three protrusions 104a1 to 104a3 are adjacent to each other at an interval of 60 °.

  On the other hand, as apparent from FIG. 12, a locking groove 101a into which the protrusions 104a1 to 104a3 of the rack bush are fitted is formed near the rack bush 103 of the rack housing 101 where the rack bush 103 is mounted.

A method of fixing the rack bush 103 to the rack housing 101 will be described with reference to FIG. First, the rack bush 103 is mounted on the rack housing 101, and the protrusions 104a1 to 104a3 of the rack bush are fitted into the grooves 101a of the housing 101. When the rack shaft 102 is inserted into the rack bush 103, the segments 103a1 to 103a3 are radially expanded by the rack shaft 102, and the protrusions 104a1 to 104a3 on the segments 103a1 to 103a3 are firmly fitted into the grooves 101a of the rack housing 101. Fixed.
Japanese Patent Application Laid-Open No. 2004-314853.

  However, the synthetic resin rack bush formed with a plurality of slits extending in the axial direction described above may have a low unit rigidity, and in the state before the rack shaft is mounted on the rack bush, the above-described protrusions are not provided in the rack housing. Even if a very low force is applied, the protrusions may be disengaged from the locking grooves provided in the rack housing and may be displaced from the original mounting positions. .

  In addition, there is a slight tightening allowance between the rack housing inner diameter and the rack bush outer diameter, so when the rack bush is mounted on the rack housing, the rack bush is deformed, and the fitting allowance of the protrusion with respect to the locking groove is reduced. However, there is a problem in that the axial position of the rack bush is not fixed, that is, the above-described protrusion is easily detached from the locking groove. The present invention aims to solve the above problems.

  The present invention solves the above-mentioned problems, and the invention according to claim 1 is a rack bush for holding a rack shaft of a rack and pinion type steering device in a rack housing, wherein the rack bush is a substantially cylindrical rack bush main body. A plurality of slits extending along the axial direction are divided into a plurality of segments excluding the ring portion constituting the base portion, and a protruding portion that fits to the locking portion of the rack housing is formed at the free end of the segment, A rack bush of a rack and pinion type steering apparatus, wherein adjacent segments are connected by a thin portion formed in a slit.

  The rack bush body has an inner diameter that gradually decreases from both ends in the cylindrical axis direction toward the center.

  And the said slit is a slit extended along the axial direction over the full length of the rack bush main body except the said ring part.

  And the said thin part is formed over the full length of the slit extended over the full length of the said rack bush main body.

  Moreover, the said thin part may be formed in a part of full length of the slit extended over the full length of the said rack bush main body.

  The invention of claim 6 is a rack bush for holding a rack shaft of a rack and pinion type steering device in a rack housing, wherein the rack bush is formed by a plurality of slits extending along an axial direction of a substantially cylindrical rack bush body. A rack bush main body divided into a plurality of segments excluding the ring portion constituting the base, and a projection that fits into a locking portion of the rack housing is formed at the free end of the segment. The rack bush of the rack and pinion type steering apparatus is provided with an annular member having elasticity for urging the segment outward in the radial direction.

  The annular member is a synthetic resin annular member.

  The annular member may be a metal coil spring.

  And the said annular member shall form the clearance which can maintain a non-contact state between the rack shafts inserted in a rack bush main body.

  According to the first aspect of the present invention, the thin portion is formed in the plurality of slits formed in the rack bush, and the adjacent segments of the divided segments are connected to each other by the thin portion, so that the rigidity of the rack bush is increased. It becomes difficult to deform, and the projection of the rack bush firmly engages with the locking groove of the rack housing, so that the rack bush does not deviate from the mounting position.

  According to the sixth aspect of the present invention, since the annular member having elasticity for urging the segment radially outward is mounted on the inner side of the projecting portion forming portion of the rack bush main body, the projection of the rack bush is provided in the rack housing. The rack bushing does not deviate from the mounting position because it is pressed and strongly engaged with the locking groove.

  Embodiments of the present invention will be described below.

  The configuration of the rack housing that accommodates the rack shaft, and the configuration in which the rack bush is mounted on the rack housing that accommodates the rack shaft, and the rack shaft is held by the rack bush are described with reference to FIG. 10, FIG. 11, and FIG. Since this is the same as the conventional configuration described, the description is omitted here, and the configuration of the rack bush according to the present invention will be described. Since there are a plurality of embodiments of the rack bush, the following description will be made sequentially.

[First Embodiment]
1A and 1B are diagrams for explaining the configuration of the rack bush according to the first embodiment. FIG. 1A is an external front view of the rack bush 10, and FIG. 1B is an AA view of FIG. FIG. 1C is a cross-sectional view taken along line BB in FIG. 1B, and FIG. 1D is an enlarged view of the slit portion.

  The rack bush 10 according to the first embodiment is formed in a substantially cylindrical shape as a whole, and the substantially cylindrical main body 11a has an inner diameter at the center in the cylindrical axis direction that is larger than the outer diameter of the rack shaft to be inserted. It is formed in a slightly small diameter.

  Further, in the substantially cylindrical main body 11a, three segments 11a1, 11a2, and 11a3 are formed by three slits 11c1, 11c2, and 11c3 of length S that are formed at intervals of 120 ° and extend long in the cylindrical axis direction. The adjacent segments 11a1 and 11a2, 11a2 and 11a3, and 11a3 and 11a1 are connected to each other by thin portions 11cx, 11cy, and 11cz formed on the bottom surface of the slit, respectively.

  The length S in the cylindrical axis direction of the slits 11c1 to 11c3 is equal to the length F1 in the cylindrical axis direction of the thin portions 11cx to 11cz formed on the bottom surface of the slit.

  In addition, a ring portion 13d is formed at the tip of the segments 11a1 to 11a3, and the segments are connected to each other.

  Three projections 12b1, 12b2, and 12b3 are formed at intervals of 120 ° on the three segments 11a1, 11a2, and 11a3 of the substantially cylindrical main body 11a on the side opposite to the ring portion 13d that connects the segments. Has been. The three slits 11c1 to 11c3 and the three protrusions 12b1 to 12b3 are adjacent to each other at an interval of 60 °.

  On the other hand, a locking groove into which the projections 12b1 to 12b3 of the rack bush are fitted is formed near the rack bush of the rack housing (not shown). This configuration is the same as the configuration described above with reference to FIG.

  A method for fixing the rack bush 10 to the rack housing will be described. First, the rack bush 10 is inserted into a rack housing (not shown), and the protrusions 12b1 to 12b3 of the rack bush 10 are temporarily fitted into the locking grooves of the rack housing. When the rack shaft is inserted into the rack bush 10, the inner diameter of the central portion of the rack bush 10 in the cylindrical axis direction is formed slightly smaller than the outer diameter of the rack shaft, so the segments 11 a 1 to 11 a 3 of the rack bush 10 are formed. Is expanded in the radial direction, and the projections 12b1 to 12b3 on the segments 11a1 to 11a3 are firmly fitted and fixed in the locking grooves of the rack housing.

  By connecting the segments 11a1 to 11a3 of the rack bush 10 with the thin portions 11cx, 11cy, and 11cz formed on the bottom surface of the slits 11c1 to 11c3 in addition to the ring portion 13d, the rigidity of the rack bush 10 is increased, and the segment 11a1 Since the positions of the protrusions 12b1 to 12b3 on ˜11a3 are also securely held, the protrusions 12b1 to 12b3 can be reliably fitted into the locking grooves of the rack housing.

[Second Embodiment]
2A and 2B are diagrams for explaining the configuration of the rack bush according to the second embodiment. FIG. 2A is an external front view of the rack bush 20 and FIG. 2B is an AA view of FIG. 2C is a cross-sectional view taken along the line BB in FIG. 2B, and FIG. 2D is an enlarged view of the slit portion.

  The rack bush 20 of the second embodiment has a configuration similar to the rack bush 10 of the first embodiment described above. That is, the rack bush 20 is entirely formed in a substantially cylindrical shape, and the substantially cylindrical main body 21a is formed such that the inner diameter of the central portion in the cylindrical axis direction is slightly smaller than the outer diameter of the rack shaft to be inserted. Has been.

  Further, in the substantially cylindrical main body 21a, three segments 21a1, 21a2, and 21a3 are formed by three slits 21c1, 21c2, and 21c3 having a length S that are formed at intervals of 120 ° and extend in the cylindrical axis direction. It is similar in that the ring portion 23d is formed at the tip of the segments 21a1 to 21a3 and the segments are connected to each other, but the adjacent segments 21a1 and 21a2, 21a2 and 21a3, 21a3 and 21a1 are They are different in that they are connected to each other by thin-walled portions 21cx, 21cy, and 21cz having a length F2 (F2 <F1) in the cylindrical axis direction formed on a part of the bottom surface of the slit.

  That is, in the rack bush 20 of the second embodiment, a part of the slits extending in the cylindrical axis direction are connected to each other by thin portions 21cx, 21cy, 21cz having a length F2 (F2 <F1) in the cylindrical axis direction. However, since the other parts are not different from the rack bush of the first embodiment, the detailed description of the configuration and the mounting method is omitted.

  By connecting the segments 21a1 to 21a3 of the rack bush 20 with thin portions 21cx, 21cy, and 21cz formed on the bottom surface of the slits 21c1 to 21c3 in addition to the ring portion 23d, the rigidity of the rack bush 20 is increased, and the segment 21a1 Since the positions of the protrusions 22b1 to 22b3 on ˜21a3 are also securely held, the fitting into the groove of the rack housing can be ensured.

[Third Embodiment]
3A and 3B are diagrams for explaining the configuration of the rack bush 30 according to the third embodiment. FIG. 3A is a plan view of the rack bush 30, FIG. 3B is a cross-sectional view thereof, and FIG. FIG. 5 is a cross-sectional view showing a state in which the rack shaft 60 is inserted into the rack bush 30 and attached to the rack housing 50.

  The rack bush 30 of the third embodiment is formed in a substantially cylindrical shape as a whole, and the substantially cylindrical main body 31a has an inner diameter at the center in the cylindrical axis direction that is larger than the outer diameter of the rack shaft to be inserted. It is formed in a slightly small diameter.

  Further, in the substantially cylindrical main body 31a, three segments 31a1, 31a2, and 31a3 are formed by three slits 31c1, 31c2, and 31c3 each having a length S that is formed at an interval of 120 ° and extends in the cylindrical axis direction. In the three segments 31a1, 31a2, 31a3, three protrusions 32b1, 32b2, 32b3 are formed at intervals of 120 ° on the opposite side of the ring portion 33d connecting the segments. The three slits 31c1 to 31c3 and the three protrusions 32b1 to 32b3 are similar to the rack bushes of the first and second embodiments in that they are adjacent to each other at 60 ° intervals. .

  The rack bush 30 is fitted with resin rings 34 on inner peripheral surfaces corresponding to the protrusions 32b1 to 32b3 formed on the outer peripheral surface of the substantially cylindrical main body 31a, and segments 31a1 to 31a3 having the protrusions 32b1 to 32b3 are provided. It is biased to spread outward in the radial direction. The resin ring 34 may have a cut 34a in the circumferential direction or may have no cut. When the circumferential cut 34a is provided, when the resin ring 34 is mounted on the rack housing 50 or when the resin ring 34 is mounted on the inner peripheral surface of the rack bush 30, the resin ring 34 is easily reduced in diameter and is easily mounted.

  The resin ring 34 may be mounted on the rack bush 30 in advance, or the resin ring 34 may be mounted at a predetermined position after the rack bush 30 without the resin ring is mounted on the rack housing 50. .

  The clearance C between the inner diameter d1 of the resin ring mounting portion of the rack bush 30 and the outer diameter d2 of the rack shaft 60 is set to be smaller than the radial thickness T of the resin ring 34 to prevent the resin ring 34 from falling off. Shall.

  On the other hand, a locking groove 51 into which the protrusions 32b1 to 32b3 of the rack bush 30 are fitted is formed near the rack bush 50 of the rack housing 50 where the rack bush is mounted. This configuration is the same as the configuration described above with reference to FIG.

  A method for fixing the rack bush 30 to the rack housing 50 will be described. First, when the rack bush 30 having the resin ring 34 attached thereto is inserted into the rack housing 50, the protrusions 32 b 1 to 32 b 3 of the rack bush 30 are fitted into the locking grooves 51 of the rack housing 50 due to the elastic repulsion of the resin ring 34. The rack bush 30 is temporarily fitted (see FIG. 4).

  Alternatively, when the rack bush 30 without a resin ring is inserted into the rack housing 50 and the protrusions 32b1 to 32b3 of the rack bush 30 are locked to the locking grooves 51 of the rack housing 50, and then the resin ring 34 is mounted on the rack bush 30. The protrusions 32b1 to 32b3 of the rack bush 30 are fitted into the locking grooves 51 of the rack housing 50 by the elastic repulsive force of the resin ring 34, and the rack bush 30 is temporarily fitted (see FIG. 4).

  When the rack shaft 60 is inserted into the rack bush 30, the inner diameter of the central portion of the rack bush 30 in the cylindrical axis direction is slightly smaller than the outer diameter of the rack shaft. 31a3 is expanded in the radial direction, and the protrusions 32b1 to 32b3 on the segments 31a1 to 31a3 are firmly fitted and fixed to the locking grooves 51 of the rack housing 50 (see FIG. 5).

[Fourth Embodiment]
6A and 6B are views for explaining the configuration of the rack bush 40 according to the fourth embodiment. FIG. 6A is a plan view of the rack bush 40, FIG. 6B is a sectional view thereof, and FIG. FIG. 8 is a cross-sectional view showing a state where the rack shaft 60 is inserted into the rack bush 40 and attached to the rack housing 50.

  The rack bush of the fourth embodiment is obtained by replacing the resin ring 34 of the rack bush 30 of the third embodiment described above with a metal coil spring 44, and other configurations are the same as those of the third embodiment. Same as rack bush.

  The rack bush 40 of the fourth embodiment is formed in a substantially cylindrical shape as a whole, and the substantially cylindrical main body 41a has an inner diameter at the center in the direction of the cylindrical axis that is larger than the outer diameter of the rack shaft to be inserted. It is formed in a slightly small diameter.

  Further, in the substantially cylindrical main body 41a, three segments 41a1, 41a2, and 41a3 are formed by three slits 41c1, 41c2, and 41c3 having a length S that are formed at intervals of 120 ° and extend in the cylindrical axis direction. In the three segments 41a1, 41a2, and 41a3, three protrusions 42b1, 42b2, and 42b3 are formed at intervals of 120 ° on the side opposite to the ring portion 43d that connects the segments. The three slits 41c1 to 41c3 and the three protrusions 42b1 to 42b3 are adjacent to each other at an interval of 60 °.

  In the rack bush 40, a metal coil spring 44 is fitted on the outer peripheral surface corresponding to the protrusions 42b1 to 42b3 formed on the outer peripheral surface of the substantially cylindrical main body 41a, and the segments 41a1 to 41b1 having the protrusions 42b1 to 42b3 are provided. 41a3 is urged so as to spread outward in the radial direction. The number of turns of the metal coil spring 44 is arbitrary.

  The metal coil spring 44 may be mounted on the rack bush 40 in advance, or after the rack bush 40 without the metal coil spring is mounted on the rack housing 50, the metal coil spring 44 is mounted at a predetermined position. May be.

  It is assumed that a sufficient clearance is provided between the inner diameter of the metal coil spring 44 and the rack shaft 60 so that the metal coil spring 44 never contacts the rack shaft 60.

  On the other hand, a locking groove 51 into which the protrusions 42b1 to 42b3 of the rack bush 40 are fitted is formed near the rack bush 50 of the rack housing 50 where the rack bush is mounted. This configuration is the same as the configuration described above with reference to FIG.

  A method for fixing the rack bush 40 to the rack housing 50 will be described. First, when the rack bush 40 having the metal coil spring 44 mounted thereon is inserted into the rack housing 50, the protrusions 42 b 1 to 42 b 3 of the rack bush 40 are formed in the locking grooves 51 of the rack housing 50 by the elastic repulsion of the metal coil spring 44. The rack bush 40 is temporarily fitted (see FIG. 7).

  Alternatively, the rack bush 40 without the metal coil spring is inserted into the rack housing 50, and the protrusions 42b1 to 42b3 of the rack bush 40 are locked to the locking groove 51 of the rack housing 50, and then the metal coil spring 44 is fixed to the rack bush 50. 40, the projections 42b1 to 42b3 of the rack bush 40 are fitted into the locking grooves 51 of the rack housing 50 by the elastic repulsion of the metal coil spring 44, and the rack bush 40 is temporarily fitted (see FIG. 7). ).

  When the rack shaft 55 is inserted into the rack bush 40, the inner diameter of the central portion in the cylindrical axis direction of the rack bush 40 is formed slightly smaller than the outer diameter of the rack shaft. 41a3 is expanded in the radial direction, and the protrusions 42b1 to 42b3 on the segments 41a1 to 41a3 are firmly fitted and fixed in the locking grooves 51 of the rack housing 50 (see FIG. 8).

  In the third and fourth embodiments, it has been described that there is no thin portion connecting the rack bush segments to each other. However, a thin portion may be provided as necessary.

  A plurality of embodiments of the present invention have been described above. In any of the embodiments, a locking groove is formed in the rack housing, and a protrusion of the rack bush is fitted and fixed to the locking groove. Explained. However, as shown in FIG. 9, a plurality of, for example, three locking holes 71 are provided in the rack column 70, and the projection of the rack bush can be fitted and fixed to the locking holes 71. Needless to say, you can.

  Provided is a rack bush for holding a rack shaft of a rack and pinion type steering device by a rack housing, in which a projection of the rack bush is not easily detached from a locking groove of the rack housing and does not deviate from an original mounting position.

The figure explaining the structure of the rack bush of 1st Embodiment. The figure explaining the structure of the rack bush of 2nd Embodiment. The figure explaining the structure of the rack bush of 3rd Embodiment. Sectional drawing which shows the state which mounted | wore the rack housing with the rack bush shown in FIG. Sectional drawing which shows the state which inserted the rack axis | shaft in the rack bush shown in FIG. 4, and was mounted | worn with the rack housing. The figure explaining the structure of the rack bush of 4th Embodiment. Sectional drawing which shows the state which attached the rack bush shown in FIG. 6 to the rack housing. Sectional drawing which shows the state which inserted the rack axis | shaft in the rack bush shown in FIG. 6, and was mounted | worn with the rack housing. The figure explaining the rack column which provided the some latching hole. FIG. 6 is an external view of a rack and pinion type steering device that accommodates a conventional rack shaft. Sectional drawing near the rack bush of the rack housing which accommodated the conventional rack shaft. Sectional drawing explaining the structure of the conventional rack housing. The figure explaining the structure of the conventional rack bush.

Explanation of symbols

10 Rack bush 11a of the first embodiment Main body (substantially cylindrical main body)
11a1, 11a2, 11a3 Segment 11c1, 11c2, 11c3 Slit 11cx, 11cy, 11cz Thin portion 12b1, 12b2, 12b3 Projection 13d Ring portion 20 Rack bush 21a of the second embodiment (substantially cylindrical main body)
21a1, 21a2, 21a3 Segment 21c1, 21c2, 21c3 Slit 21cx, 21cy, 21cz Thin portion 22b1, 22b2, 22b3 Projection 23d Ring portion 30 Rack bush 31a of the third embodiment (substantially cylindrical main body)
31a1, 31a2, 31a3 Segment 31c1, 31c2, 31c3 Slit 32b1, 32b2, 32b3 Projection 33d Ring part
34 Resin ring 34a Cut (Resin ring cut)
40 Rack bush 41a of the fourth embodiment 41a main body (substantially cylindrical main body)
41a1, 41a2, 41a3 Segment 41c1, 41c2, 41c3 Slit 42b1, 42b2, 42b3 Projection 43d Ring part
44 Metal coil spring 50 Rack housing 51 Locking groove 60 Rack shaft 70 Rack column 71 Locking hole

Claims (9)

In the rack bush that holds the rack shaft of the rack and pinion type steering device in the rack housing,
The rack bush is divided into a plurality of segments except for a ring portion constituting a base portion by a plurality of slits extending along the axial direction of the substantially cylindrical rack bush main body, and the free end of the segment has a rack housing. A rack bushing for a rack and pinion type steering apparatus, wherein a projection part that fits into a locking part is formed, and adjacent segments are connected by a thin part formed in a slit. The rack bush of the rack and pinion type steering apparatus according to claim 1, wherein the rack bush main body has an inner diameter gradually decreasing from both ends in the cylindrical axis direction toward the center. The rack bush of a rack and pinion type steering apparatus according to claim 1, wherein the slit is a slit extending along the axial direction over the entire length of the rack bush main body excluding the ring portion. The rack bush of the rack and pinion type steering device according to claim 3, wherein the thin portion is formed over the entire length of a slit extending over the entire length of the rack bush main body. The rack bush of the rack and pinion type steering device according to claim 3, wherein the thin portion is formed in a part of the entire length of the slit extending over the entire length of the rack bush main body. In the rack bush that holds the rack shaft of the rack and pinion type steering device in the rack housing,
The rack bush is divided into a plurality of segments except for a ring portion constituting a base portion by a plurality of slits extending along the axial direction of the substantially cylindrical rack bush main body, and the free end of the segment has a rack housing. A protrusion that fits into the locking portion is formed,
A rack and pinion type characterized in that an annular member having elasticity for urging the segment outward in the radial direction is attached to the inner side of the protrusion forming portion of the rack bush main body divided into the plurality of segments. Rack bush of steering device. The rack bush of a rack and pinion type steering apparatus according to claim 6, wherein the annular member is an annular member made of synthetic resin. The rack bush of the rack and pinion type steering apparatus according to claim 6, wherein the annular member is a coil spring made of metal. The rack of the rack and pinion type steering device according to claim 6, wherein the annular member is formed with a clearance that can maintain a non-contact state with a rack shaft inserted into a rack bush body. bush.

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