JP4470660B2 - Rack and pinion steering system - Google Patents

Description

  The present invention relates to a rack and pinion type used in a vehicle such as an automobile in which a pinion is rotated in conjunction with a rotating operation of a handle and a rack bar having rack teeth meshing with the pinion is reciprocated to perform steering. The present invention relates to a steering device.

Japanese Utility Model Publication No.58-19873

  A rack and pinion type steering device is usually arranged in a gear case, a pinion rotatably supported by the gear case via a pinion shaft, a rack bar formed with rack teeth meshing with the pinion, and a gear case. A rack guide that slidably supports the rack bar, and a coil spring that presses the rack guide toward the rack bar.

  In such a rack and pinion type steering device, the rack bar bends due to a force acting away from each other with the rotation of the pinion shaft at the meshing portion of the rack teeth and the pinion of the rack bar. As a result of increased backlash in the row direction, a hitting sound is generated between the teeth of the rack teeth and the pinion. Therefore, a rack having a concave surface having a small frictional resistance on the side opposite to the pinion shaft, and a semi-cylindrical concave surface. A guide is provided, and the concave surface of the rack guide is pressed against the rack bar by the elastic pressing force of the coil spring, and the concave surface of the rack guide is brought into sliding contact with the rack bar to reduce the sliding friction resistance with the rack bar. The rattling in the dentition direction is suppressed, and the hitting sound at the meshing portion between the rack teeth and the pinion is reduced.

  As a rack guide, one using a sintered metal or one made of aluminum or an aluminum alloy has been proposed, but any rack guide needs to ensure a function of moving the rack guide within the gear case. In addition, a clearance (clearance) of about 20 μm is provided between the rack guide and the inner surface of the gear case. Even when such a clearance is provided, the twisting of teeth caused by the meshing of the pinion and the rack teeth If a radial load is applied to the rack guide by the action of the wheels at both ends of the rack bar, the rack guide may be strongly pressed against the inner surface of the gear case. In this state, the rack guide is coupled with the action of the pressing force by the coil spring. The space between the guide and the gear case is a so-called “togane”, which increases the frictional resistance and thus the friction. Cause wear, problem prevent movement of the rack guide of the rack bar direction is generated.

  In order to solve the above-described problem, a rack guide with a buffer member such as an O-ring has been proposed, but when such a buffer member such as an O-ring is mounted, sliding between the buffer member and the inner surface of the gear case is not recommended. The load of the coil spring increases due to sliding resistance, and the coil spring is likely to sag (deteriorate). If the elastic spring force of the coil spring is insufficient due to this sag, the rack guide dances and the rack guide moves to the gear case. This also induces an abnormal sound (sound).

  Further, when the elastic pressing force on the concave surface of the rack guide is large, it is possible to reduce the hitting sound at the meshing portion between the rack teeth and the pinion, but a large force is required for the rotation operation of the handle, and the steering performance is deteriorated. On the other hand, if the elastic pressing force to the concave surface of the rack guide is small, the steering performance is improved, but it is difficult to reduce the hitting sound, so that the setting of the elastic pressing force requires troublesome work.

  The present invention has been made in view of such circumstances, and an object of the present invention is to eliminate the coil spring, and as a result, it is possible to eliminate the generation of abnormal noise due to the sag of the coil spring. Another object of the present invention is to provide a rack and pinion type steering device that can be easily set to an optimal elastic pressing force at all times.

  The rack and pinion type steering device of the present invention includes a gear case, a pinion rotatably supported by the gear case, a rack bar formed with rack teeth meshing with the pinion, and a rack that slidably supports the rack bar. The rack guide has a concave surface that slidably contacts the rack bar and a pressure receiving surface that receives a pressing force toward the rack bar, and the rack guide main body. An elastically deformable member disposed on the pressure receiving surface side, a pressing member that applies a pressing force toward the rack bar to the elastically deformable member, and setting means for setting the pressing force applied to the elastically deformable member by the pressing member The elastically deformable member is elastically deformed by the pressing force from the pressing member toward the rack bar, and the direction of the pressing force The rack guide body and the elastic pressing member are arranged in the gear case with a gap with respect to the gear case so as to bulge in a direction orthogonal to the rack. The deformable member comes into contact with the inner surface of the gear case by bulging due to the pressing force applied to the applied rack bar.

  According to the rack and pinion type steering device of the present invention, the rack guide body and the pressing member are elastically deformed by the pressing force from the pressing member toward the rack bar and bulge in a direction orthogonal to the direction of the pressing force. Since the elastically deformable member is arranged between the elastically deformable member and the buffer member such as an O-ring, the elastically deformable member functions in accordance with the magnitude of the reaction force against the pressing force. The bulging amount or hardness of the deformable member can be changed, and an elastic pressing force directed to the rack bar can be generated by the elastic deformable member instead of the coil spring. Direct contact with the inner surface can be reliably avoided, and furthermore, the coil spring can be omitted to eliminate the generation of abnormal noise caused by the coil spring sag. As a result of setting the pressing force to the elastically deformable member by the setting means, the bulging amount or hardness of the elastically deformable member can be set to a predetermined value, thus requiring complicated work. The optimal elastic pressing force can always be easily set without doing this.

  In a preferred example, the setting means includes a stepped portion of the gear case, a stepped portion of the pressing member that contacts the stepped portion, and a screwing portion that screws the pressing member into the inner surface of the gearcase. In the pinion type steering device, preferably, the gear case accommodates the rack guide body and the elastically deformable member, and has a small-diameter hollow portion defined by a cylindrical small-diameter inner surface, and is adjacent to the small-diameter hollow portion and is cylindrical. A large-diameter hollow portion defined by the large-diameter inner surface, and the pressing member is disposed in the small-diameter hollow portion and has a small-diameter cylindrical portion having a small-diameter outer surface, and is adjacent to the small-diameter cylindrical portion. And a large-diameter cylindrical portion having a large-diameter outer surface disposed in a large-diameter hollow portion, and the stepped portion of the gear case is interposed between the small-diameter inner surface and the large-diameter inner surface, and a pressing member The steps of the small diameter outer surface and the large diameter outer surface Is interposed between, Nishigobu is interposed between the large-diameter inner surface and the large-diameter outer surface.

  In another preferred example, the gear case has a hollow portion that accommodates the rack guide body and the elastically deformable member and is defined by a cylindrical inner surface, and an end surface that is open at one end of the hollow portion. The pressing member has a cylindrical portion disposed in the hollow portion, and the setting means includes a flange portion that is provided integrally with the cylindrical portion and has an annular side surface that contacts the end surface, and a pressing member. A screwing portion to be screwed into the gear case is provided, and the screwing portion is interposed between the cylindrical inner surface and the cylindrical outer surface of the columnar portion.

  In another preferred example of the present invention, the gear case includes a rack guide body and an elastically deformable member, and has a hollow portion defined by a cylindrical inner surface, and the pressing member is disposed in the hollow portion. The setting means is provided integrally with the rack guide body, embedded in the elastically deformable member and extended toward the end surface of the pressing member, and a pressing means. A screwing part for screwing the member into the gear case is provided, and the screwing part is interposed between the cylindrical inner surface and the cylindrical outer surface of the columnar part.

  In the present invention, a rigid plate interposed between the elastically deformable member and the pressing member may be further provided, and each of the rack guide body, the elastically deformable member, and the pressing member is preferably made of resin. In particular, the elastically deformable member is made of a resin and is made of a resin such as natural or synthetic rubber or polyurethane elastomer.

  According to the present invention, as a result of omitting the coil spring, it is possible to eliminate the generation of noise due to the sag of the coil spring, and it is possible to easily set the optimum elastic pressing force at all times. A pinion type steering device can be provided.

  Next, the present invention and the best mode for carrying it out will be described in more detail based on the preferred embodiments shown in the drawings. The present invention is not limited to these examples.

  1 to 6, the rack and pinion type steering device 1 of this example is supported by a gear case 3 made of aluminum or an aluminum alloy having a hollow portion 2 and a gear case 3 via rolling bearings 4 and 5 so as to be rotatable. The steering shaft 6 is disposed in the hollow portion 2 and is provided integrally with a shaft end portion (pinion shaft) of the steering shaft 6 and is rotatably supported by the gear case 3 via the steering shaft 6. A rack guide 9 formed with a pinion 7, rack teeth 8 that mesh with the pinion 7, and a rack guide that is arranged in the hollow portion 2 in the gear case 3 and that slidably supports the rack bar 9 in the movement direction A. 10.

  The gear case 3 having the cylindrical portion 20 accommodates the rack guide body 11, the elastically deformable member 12 and the rigid plate 13 of the rack guide 10 in the cylindrical portion 20, and a small-diameter hollow portion 15 defined by the small-diameter inner surface 14. And a large-diameter hollow portion 18 that is adjacent to the hollow portion 15 and is defined by a cylindrical large-diameter inner surface 16 and that accommodates the pressing member 17 of the rack guide 10.

  A rack bar 9 that passes through the gear case 3 in a direction A perpendicular to the axis of the steering shaft 6 and is movably disposed in the direction A is half on the back side facing the surface on which the rack teeth 8 are formed. It has a cylindrical outer peripheral surface 19.

  The rack guide 10 has a rack guide body 11 having a semi-cylindrical concave surface 21 that slidably contacts the outer peripheral surface 19 of the rack bar 9 and a pressure receiving surface 22 that receives a pressing force F toward the rack bar 9; An elastically deformable member 12 disposed on the pressure receiving surface 22 side of the rack guide body 11, a pressing member 17 that applies a pressing force F toward the rack bar 9 to the elastically deformable member 12, and the elastically deformable member 12 by the pressing member 17. And setting means 23 for setting the pressing force F applied to the disk, and a disk-shaped rigid plate 13 interposed between the elastically deformable member 12 and the pressing member 17.

  The rack guide main body 11 made of metal or synthetic resin includes a main body portion 26 having a concave surface 21 and a pressure receiving surface 22, and is provided integrally with the main body portion 26 at one end, and the elastically deformable member 12 and the pressing member. 17 and a cylindrical support portion 30 that penetrates through holes 27, 28, and 29 of the rigid plate 13, respectively.

  The main body portion 26 has a cylindrical outer peripheral surface 31 in addition to the concave surface 21 and the pressure receiving surface 22. The pressure receiving surface 22 is connected to the semi-cylindrical curved pressure receiving convex surface 32 and the curved pressure receiving convex surface 32 and is pressed. A pair of orthogonal pressure receiving surfaces 33 and 34 orthogonal to the direction of the pressure F is provided, and the outer peripheral surface 31 is disposed in the cylindrical portion 20 of the gear case 3 with a gap with respect to the small diameter inner surface 14.

  The support part 30 engages and presses the cross-shaped slit 35 that facilitates elastic deformation of the other end and facilitates insertion into the through holes 27, 28, and 29, and the annular step part 36 of the pressing member 17. The other end has a bulging portion 37 that prevents the member 17 from coming out of the through hole 29.

  The elastically deformable member 12 made of a resin such as natural or synthetic rubber or polyurethane elastomer is in contact with the curved pressure-receiving convex surface 32 and has a curved pressing concave surface 41 having a shape corresponding to the curved pressure-receiving convex surface 32 and a flat surface. A pair of orthogonal pressing surfaces 42 and 43 having a shape corresponding to and in contact with the orthogonal pressure receiving surfaces 33 and 34 and one annular flat surface 44 of the rigid plate 13 facing each other. The annular orthogonal flat surface 45 having a shape corresponding to the orthogonal flat surface 44 orthogonal to the direction of the pressing force F, the cylindrical outer peripheral surface 46, and the support portion 30 penetrate therethrough. And a cylindrical inner peripheral surface 48 that slidably contacts the cylindrical outer peripheral surface 47 of the support portion 30 and that defines the through hole 27. The curved pressure receiving convex surface 32 of the rack guide body 11, the pair of orthogonal pressure receiving surfaces 33 and 34, and the rigid plate 13 are orthogonal with respect to the direction of the pressing force F so as to be elastically deformed by the pressing force F from the pressure member 17 toward the rack bar 9. It is arranged between the flat surface 44.

  Between the main body portion 26 of the rack guide main body 11 and the pressing member 17 so as to be elastically deformed by the pressing force F from the pressing member 17 toward the rack bar 9 and bulge in a direction orthogonal to the direction of the pressing force F. The elastically deformable member 12 disposed on the bulge swells toward the inner surface 14 of the small diameter of the cylindrical portion 20 of the gear case 3 by the pressing force F applied to the applied rack bar 9 and moves toward the applied rack bar 9. Due to the bulging by the pressing force F, the outer peripheral surface 46 is in contact with the small diameter inner surface 14 of the gear case 3.

  An annular pressing member 17 made of metal or synthetic resin is arranged in a small-diameter hollow portion 15 and has a small-diameter cylindrical portion 52 having a small-diameter outer surface 51, and is adjacent to the small-diameter cylindrical portion 52 and has a large-diameter hollow portion. 18, a large-diameter cylindrical portion 54 having a large-diameter outer surface 53, a through-hole 29 through which the support portion 30 passes, and a through-hole 55 communicating with the through-hole 29 and having a larger diameter than the through-hole 29. The small-diameter cylindrical portion 52 is orthogonal to the direction of the pressing force F and faces and contacts the other annular orthogonal flat surface 56 of the rigid plate 13. An annular orthogonal pressing surface 57 having a corresponding shape is provided.

  The setting means 23 includes an annular step 61 of the gear case 3 that houses the rack guide main body 11 and the elastically deformable member 12, an annular step 62 of the pressing member 17 that contacts the step 61, and the pressing member 17 as a gear case. 3, a stepped portion 61 is interposed between the small diameter inner surface 14 and the large diameter inner surface 16, and the stepped portion 62 is The small-diameter outer surface 51 and the large-diameter outer surface 53 are interposed between the small-diameter outer surface 51 and the large-diameter outer surface 53. Between the large-diameter inner surface 16 and the large-diameter outer surface 53.

  An annular rigid plate 13 having an outer diameter substantially equal to the diameter of the small-diameter outer surface 51 includes an orthogonal flat surface 44, an orthogonal flat surface 56, and a through hole 28, and is disposed in the hollow portion 15. In the present invention, the rigid plate 13 may be omitted, and the orthogonal pressing surface 57 of the pressing member 17 may be directly brought into contact with the orthogonal flat surface 45 of the elastically deformable member 12.

  In the rack and pinion type steering device 1 described above, the pressing member 17 is screwed into the cylindrical portion 20 by screwing the male screw 65 with the female screw 64, and the stepped portion 62 is brought into contact with the stepped portion 61. When a certain pressing force F is applied to the elastically deformable member 12, the pressing force F applied to the elastically deformable member 12 is transmitted to the rack guide body 11 by elastically deforming the elastically deformable member 12. The rack guide main body 11 elastically supports the rack bar 9 slidably on the concave surface 21 by the elastic force in the direction of the pressing force F caused by the elastic deformation of the elastically deformable member 12, and the rack guide body 11 rotates in the rotation of the steering shaft 6. The engagement of the teeth 8 with the pinion 7 is ensured, the hitting sound at the engagement portion between the rack teeth 8 and the pinion 7 is reduced, and the movement of the rack bar 9 in the direction A due to the engagement is guided, The elastically deformable member 12 bulges toward the small-diameter inner surface 14 that is the cylindrical inner surface of the gear case 3 by elastic deformation due to the applied pressing force F toward the rack bar 9 and contacts the small-diameter inner surface 14 at its outer peripheral surface 46. In addition, as a result of changing the bulging amount or hardness according to the magnitude of the reaction force against the pressing force F, direct contact with the small-diameter inner surface 14 of the rack guide body 11 can be reliably avoided. Even if the rack guide body 11 is danced, collision between the rack guide body 11 and the small-diameter inner surface 14 can be avoided, and noise caused by the collision can be prevented. In the rack guide 10, the elastically deformable member 12 is sandwiched between the orthogonal pressure receiving surfaces 33 and 34 of the rack guide main body 11 and the orthogonal flat surface 44 of the rigid plate 13, so that the elastically deformable member 12 is subjected to creep deformation. In addition to being able to reduce the amount of slack, a stable elastic pressing force F can be applied to the rack bar 9, and the pressing force F applied to the elastically deformable member 12 by the pressing member 17 is screwed at the screwing portion 63 in the setting means 23. As a result of the setting and the contact of the stepped portion 62 with the stepped portion 61, the bulging amount or hardness of the elastically deformable member 12 can be set to a predetermined value.

  Thus, according to the rack and pinion type steering device 1, the elastically deformable member 12 can generate the elastic pressing force F toward the rack bar 9, so that the rack guide main body 11 can be directly applied to the small-diameter inner surface 14. In addition, it is possible to avoid the contact of the coil spring and to eliminate the generation of noise caused by the coil spring sag, and to always provide the optimal elastic pressing force without requiring complicated work. The pressure F can be easily set.

  In the present invention, instead of the setting means 23 having the step portions 61 and 62, the setting means 23 not having the step portions 61 and 62 as shown in FIGS. 7 and 8 may be used. That is, in the rack and pinion type steering apparatus 1 having the setting means 23 shown in FIGS. 7 and 8, the gear case 3 having the cylindrical portion 20 is replaced with the hollow portion 15 and the hollow portion 18 having different diameters instead of the cylindrical portions having the same diameter. The cylindrical portion 20 has a hollow portion 72 of the same diameter that is defined by the inner surface 71 and accommodates the rack guide body 11, the elastically deformable member 12, and the rigid plate 13, and one end of the hollow portion 72 is cylindrical. The pressing member 17 includes a columnar portion 76 that is disposed in the hollow portion 72 and has an annular end surface 74, a cylindrical outer surface 75, and a through hole 29. The end surface 74 faces and contacts the orthogonal flat surface 56 of the rigid plate 13, and has a shape corresponding to the orthogonal flat surface 56. The setting means 23 is integrated with the cylindrical portion 76. At the end with 73, a flange portion 78 having an annular side surface 77 in contact with 73, and a screwing portion 79 for screwing the pressing member 17 into the cylindrical portion 20 of the gear case 3, and the screwing portion 79 on the inner surface 71. The inner screw 71 formed on the outer surface 75 and the outer screw 75 formed on the outer surface 75 are interposed between the cylindrical inner surface 71 and the cylindrical outer surface 75 of the column portion 76.

  Also in the rack and pinion type steering apparatus 1 having the setting means 23 shown in FIGS. 7 and 8, the pressing member 17 is screwed into the cylindrical portion 20 by screwing the male screw 65 with the female screw 64, and the side surface 77 is set to the end surface 73. Can be applied to the elastically deformable member 12 via the rigid plate 13, whereby a stable elastic pressing force F can be applied to the rack bar 9. The pressing force F applied to the elastically deformable member 12 by the member 17 can be set by the screwing at the screwing portion 79 in the setting means 23 and the contact with the end surface 73 of the side surface 77. As a result, the bulging amount of the elastically deformable member 12 Alternatively, the hardness can be set to a predetermined value, and the optimum elastic pressing force F can always be easily set without requiring a complicated operation.

  Instead of the setting means 23 having the step portions 61 and 62 or the flange portion 78, a setting means 23 not having the step portions 61 and 62 or the flange portion 78 as shown in FIGS. 9 and 10 may be used. That is, the setting means 23 shown in FIGS. 9 and 10 is integrally provided on the curved pressure receiving convex surface 32 of the pressure receiving surface 22 in the main body portion 26 of the rack guide main body 11 instead of the step portions 61 and 62 or the flange portion 78. And a plurality of columnar protrusions 81 that are embedded in the elastically deformable member 12 and extend toward the end surface 74 of the pressing member 17 to the vicinity of the orthogonal flat surface 44 of the rigid plate 13. Also in the rack and pinion type steering apparatus 1 provided with the setting means 23 composed of 81 and the threaded portion 79, the protrusion 81 is formed by screwing the pressing member 17 into the cylindrical portion 20 by screwing the male screw 65 to the female screw 64. A constant pressing force F can be applied to the elastically deformable member 12 through the rigid plate 13 while the orthogonal flat surface 44 of the rigid plate 13 is brought close to the tip of the plate, and the elastic deformation itself by the protrusion 81 can be applied. A stable elastic pressing force F can be applied to the rack bar 9 by restricting the compression of the member 12 to a certain level. Thus, the pressing force F applied to the elastically deformable member 12 by the pressing member 17 is set in the setting means 23. As a result of being able to be set by screwing at the screwing portion 79 and restriction of compression of the elastically deformable member 12 by a certain amount by the projection 81, the bulging amount or hardness of the elastically deformable member 12 is set to a predetermined value. Therefore, the optimum elastic pressing force F can always be easily set without requiring complicated work.

  In the above example, the rack guide main body 11 having the curved pressure receiving convex surface 32 and the pair of orthogonal pressure receiving surfaces 33 and 34 is used. Instead, the rack guide main body 11 as shown in FIGS. 11 to 14 is used. May be used. In the rack guide main body 11 shown in FIGS. 11 to 14, the main body portion 26 is orthogonal to the direction of the pressing force F and can be elastically deformed instead of the curved pressure receiving convex surface 32 and the pair of orthogonal pressure receiving surfaces 33 and 34. One annular orthogonal pressure receiving surface 91 that receives a pressing force F from the member 12 toward the rack bar 9, a bottom long groove 92 that is disposed at the bottom of the concave surface 21 and extends parallel to the direction A of the rack bar 9, and the concave surface 21 And an orthogonal long groove 93 extending perpendicularly to the direction in which the bottom long groove 92 extends, and the orthogonal long groove 93 which is narrower and shallower than the bottom long groove 92 and the bottom long groove 92 Lubricating oil such as grease is stored, and for the rack guide main body 11 shown in FIGS. 11 to 14, an annular ring orthogonal to the direction of the through hole 27 and the pressing force F as shown in FIG. A cylindrical or disk-shaped elastically deformable member 12 having flat pressing surfaces 94 and 95 is used. One flat pressing surface 94 faces and contacts the orthogonal pressure receiving surface 91 and the orthogonal pressure receiving surface 91. The other flat pressing surface 95 faces and contacts the orthogonal flat surface 44 of the rigid plate 13. In the rack guide main body 11 shown in FIGS. 11 to 14 as well, as described above, the pressing force F applied to the elastically deformable member 12 by the pressing member 17 can be set by the setting means 23. The output amount or hardness can be set to a predetermined value.

It is sectional drawing of a preferable example of embodiment of this invention. It is a top view of the rack guide main body shown in FIG. FIG. 3 is a cross-sectional view of the rack guide body shown in FIG. 1 taken along line III-III shown in FIG. It is a perspective view of the elastically deformable member shown in FIG. It is a perspective view of the rigid board shown in FIG. It is a perspective view of the pressing member shown in FIG. It is a partial sectional view of other desirable examples of an embodiment of the invention. It is a perspective view of the pressing member shown in FIG. FIG. 10 is a partial cross-sectional view of still another preferred example of an embodiment of the present invention. FIG. 10 is a cross-sectional view of the rack guide body shown in FIG. 9. It is sectional drawing of another preferable example of embodiment of this invention. It is sectional drawing of the rack guide main body shown in FIG. It is a top view of the rack guide main body shown in FIG. FIG. 14 is a cross-sectional view taken along line XIV-XIV shown in FIG. 13. It is a perspective view of the elastically deformable member shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rack and pinion type steering device 2 Hollow part 3 Gear case 4, 5 Rolling bearing 6 Steering shaft 7 Pinion 8 Rack tooth 9 Rack bar 10 Rack guide

Claims (7)

  A rack case includes a gear case, a pinion rotatably supported by the gear case, a rack bar formed with rack teeth meshing with the pinion, and a rack guide that slidably supports the rack bar. Includes a rack guide body having a concave surface slidably contacting the rack bar and having a pressure receiving surface that receives a pressing force toward the rack bar, and an elastically deformable member disposed on the pressure receiving surface side of the rack guide body. The elastic deformable member includes a pressing member that applies a pressing force toward the rack bar, and a setting unit that sets the pressing force applied to the elastic deformable member by the pressing member. The rack guide book so that it is elastically deformed by the pressing force from the pressing member toward the rack bar and bulges in a direction perpendicular to the direction of the pressing force. The rack guide body and the elastic pressing member are arranged in the gear case with a gap with respect to the gear case, and the elastically deformable member is caused by the pressing force toward the applied rack bar. A rack and pinion type steering device that comes into contact with the inner surface of the gear case by bulging.   2. The rack and pinion according to claim 1, wherein the setting means includes a step portion of the gear case, a step portion of the pressing member that contacts the step portion, and a screwing portion that screws the pressing member into the inner surface of the gear case. Steering device.   The gear case accommodates the rack guide body and the elastically deformable member, and has a small-diameter hollow portion defined by the cylindrical small-diameter inner surface, and a large-diameter adjacent to the small-diameter hollow portion and defined by the cylindrical large-diameter inner surface. The pressing member is disposed in the small-diameter hollow part and has a small-diameter cylindrical part having a small-diameter outer surface, and is disposed in the large-diameter hollow part adjacent to the small-diameter cylindrical part. A large-diameter cylindrical portion having a large-diameter outer surface, the step portion of the gear case is interposed between the small-diameter inner surface and the large-diameter inner surface, and the step portion of the pressing member is large with the small-diameter outer surface. The rack and pinion type steering apparatus according to claim 2, wherein the rack and pinion type steering device is interposed between the large-diameter inner surface and the large-diameter outer surface.   The gear case accommodates the rack guide body and the elastically deformable member, and has a hollow portion defined by a cylindrical inner surface, and an end surface in which one end of the hollow portion is open, and the pressing member is a hollow portion. The setting means includes a flange portion that is provided integrally with the cylindrical portion and has an annular side surface that contacts the end surface, and a screw that screwes the pressing member into the gear case. The rack and pinion type steering device according to claim 1, further comprising a coupling portion, wherein the screwing portion is interposed between the cylindrical inner surface and the cylindrical outer surface of the column portion.   The gear case accommodates the rack guide main body and the elastically deformable member and has a hollow portion defined by a cylindrical inner surface, and the pressing member has a column portion having an end surface arranged in the hollow portion. The setting means is provided integrally with the rack guide main body and is embedded in the elastically deformable member and extended toward the end surface of the pressing member, and the screwing for screwing the pressing member into the gear case. The rack-and-pinion steering device according to claim 1, wherein the screwing portion is interposed between the cylindrical inner surface and the cylindrical outer surface of the column portion.   The rack and pinion type steering device according to any one of claims 1 to 5, further comprising a rigid plate interposed between the elastically deformable member and the pressing member.   The rack and pinion type steering device according to any one of claims 1 to 6, wherein each of the rack guide body, the elastically deformable member, and the pressing member is made of resin.

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