JP2006213281A - Rack and pinion type steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rack and pinion type steering device provided with a rack guide capable of properly maintaining an engagement state of a pinion tooth and a rack tooth. <P>SOLUTION: The rack guide 20 comprises a holder 21 and a roller 24 pivoted by a pin 22 held the holder 21, and attached to a tubular section 13a formed in a pinion housing 13. The roller 24 supports a rack shaft from the backside, and maintains the engagement state properly. A side of the holder 21 of an adjust screw (hereafter a screw) 25 is formed substantially flat, and a spacer 27 which is a plate shape and whose center part A is formed thinker than peripheral parts is arranged on its upper surface. The central part of the screw 25 is in contact only with the center part A of the spacer 27, therefore, a frictional force between them are small. A running torque which is generated when the screw 25 is screwed into a tubular section 21a is not transferred to the holder 21 since the spacer 27 exists, thus the rotation of the rack guide 20 is prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rack and pinion type steering device for a vehicle, and more particularly to the structure of the rack guide.

  As a steering device for a vehicle, a rack and pinion type steering device that transmits rotation of a pinion to a rack is widely used. In such a rack-and-pinion type steering device, the rotational force is transmitted from the pinion shaft to the rack shaft, but since the rack teeth have a pressure angle, a component force is generated in the rack rear direction, Since the teeth try to detach from the pinion teeth, the pinion teeth and the rack teeth will not mesh properly.

  For this reason, a rack guide is disposed on the back surface of the rack shaft in the vicinity of the meshing of the rack teeth and the pinion teeth, and the rack shaft is pressed toward the pinion shaft to properly engage the rack teeth and the pinion teeth. It is comprised so that it may keep (refer patent document 1).

  FIG. 8 is a cross-sectional view illustrating an example of a configuration of a meshing portion between a rack shaft and a pinion of a conventional rack and pinion type steering device. In FIG. 8, 101 is a pinion housing, 102 is a pinion shaft connected to a steering shaft, and the pinion shaft 102 is rotatably supported by the pinion housing 101 by a ball bearing 104 and a needle bearing 105.

  Pinion teeth 102 a formed integrally with the pinion shaft 102 mesh with the rack teeth 103 a of the rack shaft 103. The pinion housing 101 is formed with a cylindrical portion 101a into which a holder 111, which is a holding member of a rack guide 110 described later, is inserted, and an adjustment screw member described later is provided near the opening of the cylindrical portion 101a. The adjustment screw 115 is screwed and a thread groove for adjusting the push-in amount is formed.

  The rack guide 110 includes a cylindrical holder 111, a pin 112 disposed in a direction orthogonal to the cylindrical axis of the holder 111, and a roller 114 that is rotatably supported on the pin 112 by a needle bearing 113. The cylindrical portion 101a formed on the pinion housing 101 is slidably disposed.

  The holder 111 has a protrusion 111a having a diameter smaller than the outer diameter of the holder 111 at the end opposite to the rack shaft 103 side, and a disk spring 116 is fitted into the protrusion 111a in the radial direction. Movement is regulated.

  The end of the adjustment screw 115 facing the holder 111 is formed with a recess at the center, and only the periphery of the end of the adjustment screw 115 is in contact with the disc spring 116.

In the above configuration, the holder 111 is inserted into the cylindrical portion 101a of the pinion housing 101, and the roller 114 is brought into contact with the back surface of the rack shaft (the surface opposite to the meshing surface between the pinion teeth 102a and the rack teeth 103a), The adjusting screw 115 is screwed in via the disc spring 116 from the end of the tubular portion 101a, and the amount of pressing is adjusted to adjust the amount of compression of the disc spring 116. After adjusting the compression amount, the adjustment screw 115 is fixed by the lock nut 119. Since the holder 111 of the rack guide 110 can be displaced by the amount of deflection of the disc spring 116, the amount of engagement between the rack teeth and the pinion teeth can be properly maintained.
JP 2004-34829 A.

  The rack guide of the rack and pinion type steering device as described above is limited in overall size due to the layout when the steering device is mounted on a car. In the configuration in which contact is made from the back surface of the rack shaft 103, since both ends of the pin 112 that supports the roller 114 are supported by the grooves 111 a and 111 b of the holder 111, the width of the roller 114 is limited. For this reason, the contact angle θ between the roller 114 and the rack shaft 103 cannot be made large.

  When the adjustment screw 115 is screwed in, rotational torque is transmitted to the holder 111 via the disc spring 116. As described above, when the contact angle θ between the roller 114 and the rack shaft 103 is small, the force that suppresses the rotation of the rack guide 110 is suppressed. And the rack guide 110 rotates, and the roller 114 may ride on the rack shaft 103.

  FIG. 9 is a diagram illustrating a state where the roller rides on the rack shaft. FIG. 9A shows a state where the roller 114 is normally in contact with the rack shaft 103, and FIG. 8 shows a state in which the pin 112 supporting the roller swings in the horizontal direction and the roller 114 rides on the rack shaft 103.

  As shown in FIG. 9B, when the roller 114 rides on the rack shaft 103, the outer periphery of the roller 114 comes into contact with the center side of the rack shaft 103 having a circular cross section. When pressed downward in the direction away from the shaft 103, the amount of deflection of the disc spring 116 disposed between the upper surface of the adjusting screw 115 and the lower surface of the holder 111 increases by Δh.

  In the assembly process of the steering device, the compression amount of the disc spring 116 is adjusted while the adjustment screw 115 is screwed in. At this time, if the compression amount of the disc spring 116 is adjusted with the roller riding on the rack shaft. The bending amount of the disc spring 116 is set in a state where it is increased by Δh. Thereafter, when the state in which the roller rides on the rack shaft is eliminated by the movement of the rack shaft 103 and the contact state between the roller and the rack shaft returns to a normal state, the amount of deflection of the disc spring 116 increases by Δh. Therefore, the displaceable amount of the rack shaft 103 based on the deflection of the disc spring 116 is also set in a large state.

  As described above, when the displaceable amount of the rack shaft 103 is large, the meshing surfaces of the rack teeth and the pinion teeth are loosened during the steering operation, and inconveniences such as rattling noise occur. An object of the present invention is to provide a rack guide that reduces the rotational torque transmitted to the holder when the adjusting screw is screwed in to prevent the holder from rotating, and solves the above-described disadvantages.

  SUMMARY OF THE INVENTION The present invention solves the above problems, and the invention of claim 1 is directed to a rack shaft coupled to a traveling device, a pinion shaft coupled to a steering wheel, rack teeth of the rack shaft, and pinion teeth of the pinion shaft. In the rack and pinion type steering device having a rack guide that presses the meshing portion from the back of the rack, the rack guide includes a holding member having a roller that is in rolling contact with the back of the rack shaft, and a rack guide The adjusting screw member for adjusting the pressing amount against the meshing portion, the spring member arranged between the holding member and the adjusting screw member, and the frictional force between the opposing surfaces of the holding member and the adjusting screw member are adjusted. A rack and pinion type steering device comprising a friction adjusting member.

  The rack guide is slidably disposed on a cylindrical portion formed in a housing of the steering device, and the adjustment screw member is screwed into the cylindrical portion to adjust a pressing amount against the meshing portion of the rack guide. It shall be.

  The friction adjustment member is a plate-like member in which a central portion of a surface facing the adjustment screw member is formed thicker than a peripheral portion, and the thick central portion is a central portion of the adjustment screw member. It is comprised so that it may contact.

  The friction adjusting member is a plate-like member, and it is preferable to perform a surface treatment so that at least one surface thereof has a low coefficient of friction.

  The friction adjusting member may be a plate-like member, and at least one surface may be covered with a low friction coefficient resin film.

  Further, the friction adjustment member may be a thrust bearing disposed between opposing surfaces of the adjustment screw member and the holding member or the spring member.

  The rack-and-pinion type steering device according to the present invention includes a holding member provided with a roller in which a rack guide that adjusts the meshing amount of the rack teeth of the rack shaft and the pinion teeth of the pinion shaft rolls into contact with the back surface of the rack shaft. An adjustment screw member that adjusts the pressing amount of the rack guide against the meshing portion, a spring member that is disposed between the holding member and the adjustment screw member, and a surface between the opposing surfaces of the holding member and the adjustment screw member The friction adjusting member adjusts the frictional force, and the frictional adjusting member reduces the frictional force between the holding member and the adjusting screw member.

  With this configuration, the rotational torque generated when the adjusting screw member is screwed in is not transmitted to the holding member, and the rack guide can be prevented from being rotated. The problem that the pressing roller rides on the rack shaft can be solved, and the meshing amount between the rack teeth and the pinion teeth can be properly maintained.

  Embodiments of the present invention will be described below.

[First Embodiment]
FIG. 1 is a front view of the overall configuration of a rack and pinion type steering device 10 according to a first embodiment of the present invention, partially shown in cross section. In FIG. 1, 11 is a pinion shaft, 12 is a rack shaft, and 12 a is a rack tooth formed on the rack shaft 12. Although not shown, pinion teeth (11 a) are formed at the tip of the pinion shaft 11 and mesh with the rack teeth 12 a of the rack shaft 12. Reference numeral 13 denotes a pinion housing that covers the meshing portion, and reference numeral 14 denotes a rack shaft housing.

  The end of the rack shaft 12 is configured to be bilaterally symmetric. A tie rod 16 is coupled to the end of the rack shaft 12 via a ball joint 15, and a buffer member 19 is disposed in contact with the end surface of the ball joint 15. ing.

  FIG. 2 is a cross-sectional view illustrating a configuration of a meshing portion between a rack shaft and a pinion of the rack and pinion type steering apparatus according to the first embodiment. In FIG. 2, reference numeral 11 denotes a pinion shaft connected to the steering shaft. The pinion shaft 11 is rotatably supported on the pinion housing 13 by a ball bearing 17 and a needle bearing 18.

  Pinion teeth 11 a are formed integrally with the pinion shaft 11 and mesh with the rack teeth 12 a of the rack shaft 12. The pinion housing 13 is integrally formed with a cylindrical portion 13a that accommodates a holder 21 that is a holding member of a rack guide 20 described later.

  The rack guide 20 includes a holder 21, a pin 22 disposed in a direction orthogonal to the cylindrical axis of the holder 21, and a roller 24 that is rotatably supported on the pin 22 by a needle bearing 23.

  A protrusion 21a having a smaller diameter than the outer diameter of the holder 21 is formed at the end opposite to the rack shaft 12 side of the holder 21, and a disc spring 26 as a spring member is fitted into the protrusion 21a. Radial movement is restricted.

  An end portion of the adjusting screw 25 that is an adjusting screw member that faces the holder 21 is formed in a substantially flat surface, and a spacer 27 that is a friction adjusting member is disposed on the upper surface thereof. The adjusting screw 25 has the spacer 27 interposed therebetween. Are configured to come into contact with the disc spring 26.

  The spacer 27 is a plate-like member, and the central portion A of the surface facing the adjustment screw 25 is formed thicker than the peripheral portion so that the thick central portion A contacts the central portion of the adjustment screw 25. It is configured.

  Next, the assembly procedure of the rack guide 20 will be described. The holder 21 is inserted into the cylindrical portion 13a of the pinion housing 13, and the roller 24 is brought into contact with the back surface of the rack shaft (the surface opposite to the meshing surface between the pinion teeth 11a and the rack teeth 12a), so that the cylindrical portion 13a The adjusting screw 25 is screwed in via the disc spring 26 and the spacer 27 from the end, and the pressing amount is adjusted to adjust the compression amount of the disc spring 26. After the compression amount is adjusted, the adjustment screw 25 is fixed by the lock nut 19. Since the holder 21 of the rack guide 20 can be displaced by the amount of deflection of the disc spring 26, the amount of engagement between the rack teeth and the pinion teeth can be maintained appropriately.

  As described above, the spacer 27 is formed such that the central portion A is thicker than the peripheral portion, contacts only the central portion of the adjusting screw 25, and no large frictional force is generated on the contact surface between the spacer 27 and the adjusting screw 25. Thus, the spacer 27 does not rotate even when the adjusting screw 25 rotates. Accordingly, the rotational torque generated when the adjusting screw 25 is screwed is not transmitted to the holder 21, and the rack guide 20 is not rotated by the screwing of the adjusting screw 25, and the rack guide 20 can be prevented from rotating.

  In the first embodiment, the end portion of the adjustment screw 25 that faces the holder 21 is formed in a substantially flat surface, and the central portion A of the surface of the spacer 27 that faces the adjustment screw 25 is thicker than the peripheral portion. However, conversely, the surface of the adjusting screw 25 facing the holder 21 may be formed higher than the peripheral portion, and the surface of the spacer 27 facing the adjusting screw 25 may be formed in a substantially flat surface. In this configuration as well, a large frictional force is not generated on the contact surfaces of both.

[Second Embodiment]
Since the overall configuration of the rack and pinion type steering apparatus 10 of the second embodiment is the same as that of the first embodiment described above, the description is omitted here and the configuration of the rack guide is omitted. explain.

  FIG. 3 is a cross-sectional view illustrating a configuration of a meshing portion between the rack shaft and the pinion of the rack and pinion type steering apparatus of the second embodiment. The second embodiment is the same as the first embodiment except that the configuration of the rack guide is different from that of the first embodiment, and the other members are the same as those of the first embodiment. Therefore, the description will be omitted and different configurations will be described.

  The rack guide 30 includes a holder 21, a pin 22 disposed in a direction orthogonal to the cylindrical axis of the holder 21, and a roller 24 rotatably supported on the pin 22 by a needle bearing 23.

  A protrusion 21a having a smaller diameter than the outer diameter of the holder 21 is formed at the end opposite to the rack shaft 12 side of the holder 21, and a disc spring 26 as a spring member is fitted into the protrusion 21a. Radial movement is restricted.

  The end of the adjustment screw 35 that is the adjustment screw member that faces the holder 21 is formed in a flat area around the recess formed in the center, and a spacer 37 that is a friction adjustment member is disposed on the upper surface thereof. The adjustment screw 35 is configured to contact the disc spring 26 with a spacer 37 interposed therebetween.

  The spacer 37 is subjected to a surface treatment with a low coefficient of friction on at least one side or both sides. The surface treatment method is a known method. Further, at least one surface or both surfaces of the spacer 37 may be coated with a low friction coefficient resin, for example, a Teflon (registered trademark) coating.

  Next, the assembly procedure of the rack guide 30 will be described. The holder 21 is inserted into the cylindrical portion 13a of the pinion housing 13, and the roller 24 is brought into contact with the back surface of the rack shaft (the surface opposite to the meshing surface between the pinion teeth 11a and the rack teeth 12a), so that the cylindrical portion 13a The adjusting screw 35 is screwed in via the disc spring 26 and the spacer 37 from the end, and the pressing amount is adjusted to adjust the compression amount of the disc spring 26. After adjusting the compression amount, the adjustment screw 35 is fixed by the lock nut 19. Since the holder 21 of the rack guide 30 can be displaced by the amount of deflection of the disc spring 26, the amount of engagement between the rack teeth and the pinion teeth can be properly maintained.

  Since the surface of the spacer 37 is coated with a surface treatment having a low friction coefficient or a coating of a low friction coefficient resin, the low friction coefficient surface of the surface of the spacer 37 is disposed on the side facing the adjustment screw 35. Thus, even if the adjusting screw 35 is screwed in, the spacer 37 does not rotate.

  Thereby, the rotational torque generated when the adjusting screw 35 is screwed is not transmitted to the holder 21, and the rotation of the rack guide 30 can also be prevented by screwing the adjusting screw 35.

[Third Embodiment]
The overall configuration of the rack-and-pinion type steering device 10 of the third embodiment is the same as that of the first embodiment described above, so the description thereof is omitted here and the configuration of the rack guide is omitted. explain.

  FIG. 4 is a cross-sectional view illustrating a configuration of a meshing portion between a rack shaft and a pinion of a rack and pinion type steering apparatus according to a third embodiment. The third embodiment is the same as the first embodiment except for the configuration of the rack guide, and the other members are the same as those of the first embodiment. Therefore, the description will be omitted and different configurations will be described.

  The rack guide 40 includes a holder 21, a pin 22 disposed in a direction orthogonal to the cylindrical axis of the holder 21, and a roller 24 that is rotatably supported on the pin 22 by a needle bearing 23.

  A protrusion 21a having a smaller diameter than the outer diameter of the holder 21 is formed at the end opposite to the rack shaft 12 side of the holder 21, and a disc spring 26 as a spring member is fitted into the protrusion 21a. Radial movement is restricted.

  A protrusion 45a is formed at the center of the end of the adjustment screw 45 that is the adjusting screw member that faces the holder 21, and a thrust bearing 46 is disposed around the protrusion 45a. There are two types of thrust bearings 46.

  FIG. 5 is a cross-sectional view for explaining a first embodiment of the configuration of the end portion of the adjusting screw 45. In the first embodiment, a thrust needle bearing 46A is arranged as the thrust bearing 46. The thrust needle bearing 46A is provided with raceways 46A1 and 46A2, and further includes a holder 46A3 for holding the needle 46A4. The outer surface of the raceway 46A1 contacts the side surface of the disc spring 26 of the holder 21, and the raceway ring. The outer surface of 46A2 is in contact with the end of the adjustment screw 45.

  FIG. 6 is a cross-sectional view for explaining a second embodiment of the configuration of the end of the adjustment screw 45. In the second embodiment, a thrust needle bearing 46B is arranged as the thrust bearing 46. The thrust needle bearing 46B includes a raceway ring 46B1 and a retainer 46B3 for holding the needle 46B4. The needle 46B4 is directly attached to the adjustment screw 45 on the side of the thrust needle bearing 46B where the raceway ring is not provided. It is in contact with the end. Further, the outer surface of the race ring 46 </ b> B <b> 1 is in contact with the side surface of the disc spring 26 of the holder 21.

  In addition, a thrust needle bearing in which the race ring and the cage are integrally formed can be used. Furthermore, a thrust ball bearing may be used if there is room in the arrangement space.

  Next, the assembly procedure of the rack guide 40 will be described. The holder 21 is inserted into the cylindrical portion 13a of the pinion housing 13, and the roller 24 is brought into contact with the back surface of the rack shaft (the surface opposite to the meshing surface between the pinion teeth 11a and the rack teeth 12a), so that the cylindrical portion 13a The adjusting screw 45 is screwed in via the disc spring 26 from the end, and the pressing amount is adjusted to adjust the compression amount of the disc spring 26. After the compression amount is adjusted, the adjustment screw 45 is fixed by the lock nut 19. Since the holder 21 of the rack guide 40 can be displaced by the amount of deflection of the disc spring 26, the amount of engagement between the rack teeth and the pinion teeth can be properly maintained.

  In this configuration, since the thrust bearing 46 is disposed between the opposing surfaces of the holder 21 and the adjusting screw 45, the rotational torque generated by screwing the adjusting screw 45 is not transmitted to the holder 21, and the adjusting screw 45 is screwed. Can also prevent the holder 21 from rotating.

[Fourth Embodiment]
The overall configuration of the rack-and-pinion type steering apparatus 10 of the fourth embodiment is the same as that of the first embodiment described above, so the description thereof is omitted here and the configuration of the rack guide is omitted. explain.

  FIG. 7 is a cross-sectional view illustrating a configuration of a meshing portion between a rack shaft and a pinion of a rack and pinion type steering apparatus according to a fourth embodiment. The fourth embodiment is the same as the first embodiment except that the configuration of the rack guide is different from that of the first embodiment, and the other members are the same as those of the first embodiment. Therefore, the description will be omitted and different configurations will be described.

  The rack guide 50 includes a holder 21, a pin 22 disposed in a direction orthogonal to the cylindrical axis of the holder 21, and a roller 24 that is rotatably supported on the pin 22 by a needle bearing 23.

  The end of the holder 21 opposite to the rack shaft 12 side is formed into a flat surface. Further, the spacer 52, which is a friction adjusting member, is a disk-shaped member having a convex portion A formed on the center portion of the surface thereof and a substantially flat surface on the back surface.

  On the other hand, the end of the adjustment screw 51 facing the holder 21 is formed with a projection 51a at the center, and the disc spring 26, which is a spring member, is fitted into the projection 51a to restrict radial movement. .

  Next, the assembly procedure of the rack guide 50 will be described. The holder 21 is inserted into the cylindrical portion 13a of the pinion housing 13, and the roller 24 is brought into contact with the back surface of the rack shaft (the surface opposite to the meshing surface between the pinion teeth 11a and the rack teeth 12a), so that the cylindrical portion 13a The adjusting screw 51 is screwed in via the disc spring 26 and the spacer 52 from the end, and the pressing amount is adjusted to adjust the compression amount of the disc spring 26. After adjusting the compression amount, the adjustment screw 51 is fixed by the lock nut 19. Since the holder 21 of the rack guide 50 can be displaced by the amount of deflection of the disc spring 26, the amount of engagement between the rack teeth and the pinion teeth can be properly maintained.

  In this configuration, the raised convex surface A of the spacer 52 disposed between the opposing surfaces of the holder 21 and the adjusting screw 51 contacts the end surface of the holder 21, and the spacer 52 and the end facing the holder 21 are Since contact is made only on the raised convex surface A of the spacer 52, even if the adjusting screw 51 is screwed in, the generated rotating torque is not transmitted to the holder 21, and the rotation of the rack guide 50 is prevented even when the adjusting screw 51 is screwed in. be able to.

  A friction adjusting member (spacer or thrust bearing) is arranged between the holding member (holder) and the adjusting screw member (adjusting screw) of the rack guide that maintains the meshing state between the pinion teeth and the rack teeth, and the adjusting screw member Rotating torque generated when the screw is screwed in is configured not to be transmitted to the holding member, rack and rotation that prevents rotation of the rack guide and can maintain the meshing state between the pinion teeth and the rack teeth properly. This is a pinion type steering device.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows the partial cross section which shows the whole structure of the rack and pinion type steering device of 1st Embodiment of this invention. Sectional drawing explaining the structure of the meshing part of the rack shaft and pinion of the rack and pinion type steering device of the first embodiment. Sectional drawing explaining the structure of the meshing part of the rack shaft and pinion of the rack and pinion type steering apparatus of 2nd Embodiment. Sectional drawing explaining the structure of the meshing part of the rack axis | shaft and pinion of the rack and pinion type steering device of 3rd Embodiment. Sectional drawing explaining 1st Example of the edge part structure of an adjusting screw. Sectional drawing explaining 2nd Example of the edge part structure of an adjusting screw. Sectional drawing explaining the structure of the meshing part of the rack axis | shaft and pinion of the rack and pinion type steering device of 4th Embodiment. Sectional drawing explaining an example of a structure of the meshing part of the rack shaft and pinion of the conventional rack and pinion type steering device. The figure explaining the state in which a roller rides on a rack shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rack and pinion type steering apparatus 11 Pinion shaft 11a Pinion tooth 12 Rack shaft 12a Rack tooth 13 Pinion housing 13a Cylindrical part 14 Rack shaft housing 15 Ball joint 16 Tie rod 17 Ball bearing 18 Needle bearing 19 Lock nut 20 Rack guide 21 Holder (holding member)
21a Protruding portion 22 Pin 23 Needle bearing 24 Roller 25 Adjustment screw (adjustment screw member)
26 Disc spring (spring member)
27 spacer (friction adjustment member)
30 Rack guide 35 Adjustment screw (adjustment screw member)
37 spacer (friction adjustment member)
40 Rack guide 45 Adjustment screw (adjustment screw member)
45a Projection 46 Thrust bearing (friction adjusting member)
46A, 46B Thrust needle bearing 50 Rack guide 51 Adjust screw (adjustment screw member)
52 spacer (friction adjustment member)

Claims (6)

A rack and equipped with a rack shaft connected to the traveling device, a pinion shaft connected to the steering wheel, and a rack guide for pressing the meshing portion of the rack teeth of the rack shaft and the pinion teeth of the pinion shaft from the back of the rack・ In the pinion type steering device,
The rack guide includes a holding member having a roller that is in rolling contact with the back surface of the rack shaft, an adjustment screw member that adjusts a pressing amount of the rack guide against the meshing portion, and a gap between the holding member and the adjustment screw member. A rack-and-pinion type steering apparatus comprising: an arranged spring member; and a friction adjustment member that adjusts a friction force between opposing surfaces of the holding member and the adjustment screw member. The rack guide is slidably disposed in a cylindrical portion formed in a housing of the steering device, and the adjustment screw member is screwed into the cylindrical portion to adjust a pressing amount against the meshing portion of the rack guide. The rack-and-pinion steering device according to claim 1. The friction adjusting member is a plate-like member in which a central portion of a surface facing the adjusting screw member is formed thicker than a peripheral portion, and the thick central portion contacts the central portion of the adjusting screw member. The rack and pinion type steering apparatus according to claim 1, wherein the steering apparatus is a rack and pinion type steering apparatus. The rack-and-pinion type steering device according to claim 1, wherein the friction adjusting member is a plate-like member, and is surface-treated so that at least one surface thereof has a low coefficient of friction. . The rack-and-pinion type steering apparatus according to claim 1, wherein the friction adjusting member is a plate-like member, and at least one surface is coated with a low-friction coefficient resin film. The rack-and-pinion type steering apparatus according to claim 1, wherein the friction adjustment member is a thrust bearing disposed between opposed surfaces of the adjustment screw member and a holding member or a spring member.

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