JP2008049756A - Rack/pinion type steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rack/pinion type steering device provided with a rack guide capable of preventing deformation of a rack guide holder and preventing occurrence of rattling sound. <P>SOLUTION: In the steering device, the rack guide 13 consists of the rack guide holder 14 the whole of which is approximately cylindrical; a pin 15 arranged in a pin insertion groove 14b inside the holder; and a roller 17 in which a needle bearing 16 is press-fitted to a central portion and an outer peripheral surface is formed in a hand drum-like shape. The outer peripheral surface of the roller 17 is rolling-contacted with a back surface of a rack shaft 12 to press the rack shaft 12 toward an engaging surface. An O-ring 15a of an elastic material is mounted to the pin 15 close to an end thereof and the pin contacts the pin insertion groove 14b through the O-ring 15a. Vibration transmitted between the pin 15 and the pin insertion groove 14b in traveling of the vehicle is absorbed/attenuated by the O-ring, an engaging surface of the rack tooth and the pinion tooth is stabilized, and increase of backlash and occurrence of tooth hitting sound (rattling sound) can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rack and pinion type steering device for a vehicle.

  The rack and pinion type steering device for a vehicle transmits the rotation of the pinion to the rack meshing with the pinion, moves the tie rod attached to the end of the rack, and transmits it to the steering mechanism that controls the direction of the steering wheel. Is configured to do.

  In such a rack and pinion type steering device, a gear device having a structure in which a rotational force is transmitted from the pinion shaft to a horizontally extending rack shaft is used, and the pinion and the rack are properly meshed with each other. Thus, a rack guide that presses the back surface of the rack shaft in the meshing direction using an elastic body, for example, a spring or the like, is configured to maintain the meshing state between the pinion and the rack appropriately.

  In addition, there are two types of rack guides: a sliding type in which the rack shaft and the rack guide are brought into sliding contact with each other, and a rolling type in which the rack shaft is supported by a roller. In the rolling type, a pin for supporting the roller is provided. The rack guide holder is configured to be supported by a pin insertion groove (see Patent Document 1).

  FIG. 6 is a diagram illustrating the configuration of the rack and pinion type steering device 100. Inside the substantially cylindrical rack housing 101, a rack shaft (not shown) is disposed so as to be movable in the horizontal direction, and both ends of the rack shaft are connected to tie rods 103 and 104. In addition, the rack housing 101 is provided with a gear housing 105 that houses a gear device to be described later. A pinion shaft 106 is rotatably disposed therein, and a pinion (not shown) of the pinion shaft 106 and this are also shown. The racks that are not engaged mesh with each other, and the rotation of the pinion shaft 106 moves the rack shaft to the left and right to move the tie rods 103 and 104, thereby giving a steering angle to the steered wheels via a steering mechanism (not shown).

  In FIG. 6, reference numerals 107 and 108 denote mounting members provided on the rack housing 101 for mounting the rack and pinion type steering device 100 on the vehicle body, and the mounting members 107 and 108 are connected via mounting bolts (not shown). Fix the body frame.

  FIG. 7 is a cross-sectional view illustrating a configuration of a rolling gear device 120 that supports a rack shaft with a roller. The gear device 120 includes a pinion shaft 106 and a rack shaft 112 arranged inside a gear housing 105. Yes. The pinion shaft 106 is rotatably supported by a ball bearing 108 and a needle bearing 109. The rack shaft 112 is arranged so as to be movable in the axial direction by a rack bush (not shown). The rack teeth 112a of the rack shaft 112 are The pinion teeth 106a of the pinion formed integrally with the pinion shaft 106 are engaged with each other.

  In addition, a rack guide 114 is disposed inside the gear housing 105 on the opposite side of the rack shaft 106 from the pinion shaft 106, and the rack shaft 112 is pressed from the back surface so that the meshing state of the pinion teeth 106a and the rack teeth 112a is appropriate. Configured to maintain.

  The rack guide 114 includes a rack guide holder 115 formed in a substantially cylindrical shape as a whole, pins 116 arranged in a direction orthogonal to the axial direction of the rack shaft 112, and a pin receiving portion 115a formed in the internal space thereof, and A needle bearing 117 is press-fitted into the central portion, and is composed of a roller 118 having an outer peripheral surface formed in a drum shape.

  The roller 118 is mounted on a pin 116 and is rotatably disposed in the inner space of the rack guide holder 115. The drum-shaped outer peripheral surface of the roller 118 is in rolling contact with the back surface (the surface opposite to the meshing surface) of the rack shaft 112. The rack shaft 112 can be pressed toward the meshing surface.

  The gear housing 105 is provided with a rack guide guide portion 105a formed of a cylindrical hole for guiding the rack guide holder 115, and an outer peripheral surface of the rack guide holder 115 is fitted to the rack guide guide portion 105a. Further, a screw is formed on the inner surface of the gear housing 105 so that the adjustment screw 119 is screwed to the lower side of the rack guide guide portion 105a (the side opposite to the rack shaft 112).

  The adjustment screw 119 is a member on a bottomed cylinder and is screwed into the rack guide guide portion 105, and a disc spring 119 a is interposed between the adjustment screw 119 and the rack guide holder 115 so that the rack guide holder 115 faces the rack shaft 112. It is comprised so that it may press, and the meshing state of the rack tooth | gear 112a and the pinion tooth | gear 106a can be adjusted appropriately by adjusting the screwing amount of the adjustment screw 119. The rack guide holder 115 can be displaced by the amount of deflection of the disc spring 115a.

  FIG. 8 is a rack guide of a rolling gear device that supports the rack shaft with a roller, in which a pin and a roller are integrally formed. Since only the configuration of the rack guide is different from the configuration shown in FIG. 7, hereinafter, the same members are denoted by the same reference numerals, detailed description thereof will be omitted, and differences will be described (see Patent Document 2). .

  Inside the gear housing, a rack guide 114 is disposed on the opposite side of the rack shaft 112 from the pinion shaft 106, and the rack shaft 112 is pressed from the back so as to properly maintain the meshing state of the pinion teeth and the rack teeth. The configuration is the same as the configuration described above with reference to FIG.

  The rack guide 114 is composed of a rack guide holder 115 formed in a substantially cylindrical shape as a whole, and a roller 120 with a shaft in which pins and rollers disposed therein are integrally formed. The roller 120 with a shaft is a rack. It is arranged in a direction perpendicular to the axial direction of the shaft 112.

  The rack guide 114 is slidably fitted into a rack guide guide portion formed of a cylindrical hole for guiding the rack guide 114 formed in the gear housing 105, and is provided below the rack guide guide portion of the gear housing 105. It is biased toward the rack shaft 112 by a spring 121 disposed on the side opposite to the rack shaft 112.

  In this configuration, the entire roller 120 with shaft and the rack guide 114 are elastically supported by the spring 121. In particular, since the pin and the roller are integrally formed, the wear on the contact surface between the pin and the roller can be reduced. No abnormal noise is generated.

  FIG. 9 is a cross-sectional view for explaining an example of a rolling rack guide in which a bush (sliding bearing) having an elastic body is interposed between a roller and a pin, and FIG. 10 is a diagram showing an elastic body in a pin insertion hole of the roller. It is sectional drawing explaining the structure of the roller which inserted the provided bush (slide bearing) (refer patent document 3).

  The same members as those in the configuration shown in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted. However, in this configuration as well, the rack guide 114 is provided inside the gear housing 105 on the side opposite to the pinion shaft 106. And the rack shaft 112 is pressed from the back to maintain the meshing state of the pinion teeth 106a and the rack teeth 112a properly.

  The gear housing 105 is provided with a rack guide guide portion 105a having a cylindrical hole for guiding the rack guide 114, and the outer peripheral surface of the rack guide holder 115 is fitted to the rack guide guide portion 105a. Further, a screw is formed on the inner surface of the gear housing 105 on the lower side (the side opposite to the rack shaft 112) of the rack guide guide portion 105a, and the adjusting screw 119 is screwed.

  In the rack guide holder 115, a pin 116 is arranged in parallel to the axis of the pinion shaft. A bushing 210 that functions as a sliding bearing is inserted into the pin 116, and a roller 118 having an outer peripheral surface formed in a drum shape. Is supported rotatably. The bush 210 includes a flange portion 210a and a cylindrical portion 210b made of a low friction material, and an elastic body 210c is fixed to the outer surface thereof.

  When the steering mechanism is activated, the flange portion 210a and the cylindrical portion 210b made of the low friction material of the bushing 210 reduce the frictional resistance in the rotation direction of the roller 118, and when a thrust force acts on the roller 118. The elastic body 210c reduces the frictional resistance between the rack guide 114 and the roller 118.

  In addition, for the purpose of improving the steering stability, a mounting bolt that is a means for fixing the rack housing (see FIG. 6) containing the rack shaft to the vehicle body frame with an elastic body interposed, or an elastic body is interposed. There is also known a mounting bolt which is a means for fixing without any problem.

  FIG. 11 is a cross-sectional view showing an example of a mounting bolt for fixing the rack housing to the vehicle body frame. FIG. 11 (a) is a mounting bolt with an elastic body, and FIG. 11 (b) is a mounting bolt without an elastic body. It is.

  The mounting bolt 150 shown in FIG. 11 (a) has an elastic body 152 arranged outside the bolt main body 151. The mounting bolt 150 is inserted into the mounting members 107 and 108 of the rack housing 101 (see FIG. 6) and nuts. Since the elastic body 152 is sandwiched between the mounting members 107 and 108 and the vehicle body frame 160 when being fixed to the vehicle body frame 160 at 153, the vibration of the vehicle body transmitted to the rack housing 101 can be reduced.

The mounting bolt 155 shown in FIG. 11B does not have an elastic body arranged outside the bolt body 155. The mounting bolt 155 is inserted into the mounting members 107 and 108 of the rack housing 101 (see FIG. 6) and fixed to the vehicle body frame 160 with the nut 153. At this time, since the elastic body is not interposed, the rack housing 101 can be firmly fixed to the vehicle body frame 160, but the vibration of the vehicle body transmitted to the rack housing 101 cannot be reduced.
JP 2004-34829 A. JP-A-2005-35414. Japanese Patent Application Laid-Open No. 11-105717.

  In the rolling type rack guide described above, vibrations during vehicle travel are transmitted to the rack shaft through the tie rods, and not only the roller that contacts the rack shaft but also the pin that supports the roller and the pin receiving portion of the rack guide holder. A load acts and the surface pressure between the pin supporting the roller and the rack guide holder increases.

  Further, in the conventional rack guide, the pin 116 and the pin receiving portion of the rack guide holder 115 are in direct contact with each other, so that the contact surface is gradually crushed when vibration or the like during traveling of the vehicle is repeatedly applied to both contact surfaces. As a result, rattling occurs, the pressing force in the direction of the meshing surface between the rack and the pinion also decreases, and there is an inconvenience of increasing backlash and generating rattling noise.

  In order to reduce the contact surface pressure, there is a method of increasing the diameter of the pin, but when the pin diameter is increased, there is a disadvantage that the diameter of the roller also increases, and the length of the pin is increased. This method has the disadvantage that the rack guide holder becomes large.

  In addition, in the configuration in which the rack housing is fixed to the vehicle body frame without interposing an elastic body, vibrations during driving of the vehicle are not attenuated, which increases the surface pressure of the pins that support the rollers, which also increases backlash. The inconvenience of causing a rattling sound (rattle sound) cannot be solved. The object of the present invention is to solve the above-mentioned disadvantages.

  SUMMARY OF THE INVENTION The present invention solves the above problems, and the invention according to claim 1 is a rack and pinion type steering apparatus provided with a rolling rack guide that presses the back surface of the rack shaft toward the meshing direction of the rack and the pinion with a roller. The rack guide is disposed so as to be movable in the meshing direction of the rack and the pinion, and a rack guide holder in which a pin insertion groove is formed, and the roller is rotatably mounted. It is comprised from the pin arrange | positioned at the pin insertion groove | channel of a guide holder, and the contact part of the said pin and the pin insertion groove | channel of a rack guide holder is an elastic body to either the surface side of a pin, the pin insertion groove side, or both Is a rack and pinion type steering device.

  And the elastic body arrange | positioned at the surface side of the said pin can be made into the O-ring with which the said pin was mounted | worn.

  The elastic body disposed on the surface side of the pin may be a ring-shaped elastic body attached to the pin.

  Furthermore, in the configuration in which the elastic body is disposed on the pin insertion groove side, the elastic body may be mounted on the bottom surface of the pin insertion groove.

  According to a fifth aspect of the present invention, there is provided a rack and pinion type steering device comprising a rolling rack guide that presses the back surface of the rack shaft toward the meshing direction of the rack and the pinion with a roller. And a rack guide holder in which a pin insertion groove is formed, and a pin on which the roller is rotatably mounted and disposed in the pin insertion groove of the rack guide holder. The pin insertion groove and the pin of the rack guide holder are each provided with a contact surface formed in a plane, and the contact on the side of the pin insertion groove is supported by a load acting on the roller by the contact surface. The rack and pinion type steering apparatus is characterized in that an elastic body is disposed between a surface and a contact surface on the pin side.

  In this case, the pin may be provided with a contact surface formed in a flat shape in which the central portion has a circular cross section and the vicinity of both end portions in the pin axis direction is cut parallel to the pin axis.

  Further, the pin insertion groove of the rack guide holder has a groove-shaped contact surface composed of two planes arranged in a V-shaped cross section, and the pin has a circular central section and both end portions in the pin axial direction. It is good also as what is provided with the contact surface which consists of a convex strip comprised in the vicinity by two planes arrange | positioned by cross-section reverse V shape.

  As described above, the invention according to claim 1 is a rack and pinion type steering apparatus provided with a rolling rack guide that presses the back surface of the rack shaft toward the meshing direction of the rack and the pinion with a roller. A rack guide holder disposed so as to be movable in a meshing direction of the rack and the pinion and having a pin insertion groove formed therein, and the roller is rotatably mounted, and the pin insertion groove of the rack guide holder An elastic body is disposed on one or both of the surface side of the pin and the pin insertion groove side at the contact portion between the pin and the pin insertion groove of the rack guide holder. This is a featured rack and pinion type steering device.

  In this configuration, an elastic body is disposed on one or both of the surface side of the pin and the pin insertion groove side at the contact portion between the pin and the pin insertion groove of the rack guide holder. Is transmitted to the rack shaft through the tie rod, and even if a large load is applied to the roller and the pin supporting part of the roller and the pin receiving part of the rack guide holder, the vibration is attenuated and absorbed by the elastic body arranged at the contact part. Thus, an increase in backlash and generation of rattling noise can be suppressed.

  Further, the invention of claim 5 is a rack-and-pinion type steering apparatus provided with a rolling rack guide that presses the back surface of the rack shaft toward the meshing direction of the rack and the pinion with a roller. The rack guide holder is disposed so as to be movable in the meshing direction of the pinion and the pin insertion groove is formed therein, and the roller is rotatably mounted and is disposed in the pin insertion groove of the rack guide holder. A pin insertion groove and a pin of the rack guide holder each having a contact surface formed in a plane, and the load acting on the roller is supported by the contact surface. A rack and pinion type steering device, characterized in that an elastic body is disposed between the contact surface of the pin and the contact surface on the pin side .

  In this configuration, since the elastic body is disposed between the contact surface on the pin insertion groove side and the contact surface on the pin side, vibration during vehicle travel is transmitted to the rack shaft via the tie rod, Even if a large load is applied to the pin supporting portion and the pin receiving portion of the rack guide holder, the elastic body disposed between the contact surfaces attenuates and absorbs vibration, increasing backlash and rattling noise (rattle). Sound) can be suppressed.

  Embodiments of the present invention will be described below. The rack and pinion type steering apparatus according to the embodiment of the present invention is the same as the above-described conventional rack and pinion type steering apparatus except that the configuration of the rack guide is different. And no different. Therefore, the configuration of the rack guide of the rack and pinion type steering apparatus according to the embodiment of the present invention will be described below, and the description of the other configurations will be omitted.

[First Embodiment]
FIG. 1 is an enlarged cross-sectional view illustrating the configuration of a rack guide of a rack and pinion type steering apparatus according to a first embodiment of the present invention as viewed from the axial direction of a rack shaft. In FIG. 1, 11 is a gear housing, 12 is a rack shaft, and 13 is a rack guide. The rack guide 13 includes a rack guide holder 14 formed in a substantially cylindrical shape as a whole, and pins 15 arranged in a direction perpendicular to the axial direction of the rack shaft 12 in a pin insertion groove 14b formed in the internal space 14a. The needle bearing 16 is press-fitted into the center portion, and the outer peripheral surface is constituted by a roller 17 formed in a drum shape.

  The roller 17 is mounted on the pin 15 and is rotatably disposed in the inner space of the rack guide holder 14. The outer peripheral surface of the roller 17 formed in a drum shape is on the back surface of the rack shaft 12 (opposite to the meshing surface). It is configured to be in rolling contact and to be able to press the rack shaft 12 toward the meshing surface.

  The gear housing 11 is provided with a rack guide guide portion 11a having a cylindrical hole for guiding the rack guide holder 14, and the outer peripheral surface of the rack guide holder 14 is fitted to the rack guide guide portion 11a. In addition, a screw is formed on the inner surface of the gear housing 11 so that the adjustment screw 19 is screwed to the lower side of the rack guide guide portion 11a of the gear housing 11 (the side opposite to the rack shaft 12).

  The adjustment screw 19 is a member on a bottomed cylinder and is screwed into the rack guide guide portion 11a. A disc spring 18 is disposed between the adjustment screw 19 and the rack guide holder 14, and the adjustment screw 19 When 19 is screwed in, the rack guide holder 14 is pressed toward the rack shaft 12 via the disc spring 18. By adjusting the screwing amount of the adjusting screw 19, the meshing state of the rack teeth and the pinion teeth can be adjusted appropriately.

  Next, the configuration of the pin 15 will be described.

  As shown in FIG. 1, the pin 15 is attached with an annular O-ring 15 a made of an elastic material close to its end, as shown in FIG. 1. It is configured to contact the bottom surface of the pin insertion groove 14b formed in the guide holder 14 via an O-ring 15a.

  According to this configuration, even when vibration is transmitted between the pin 15 and the pin insertion groove 14b when the vehicle is traveling, the vibration is absorbed and attenuated by the annular O-ring 15a made of an elastic material. The contact surface between the insertion groove 14b is not crushed, the meshing surface of the rack teeth and pinion teeth is stabilized, and an increase in backlash and generation of rattling noise (rattle noise) can be suppressed. it can.

[Second Embodiment]
FIG. 2 is an enlarged cross-sectional view seen from the axial direction of the rack shaft for explaining the configuration of the rack guide of the rack and pinion type steering apparatus according to the second embodiment of the present invention. The difference from the first embodiment shown in FIG. 1 resides in the configuration of the pin 15, and the others are the same as in the first embodiment. Therefore, the same members are denoted by the same reference numerals and detailed description thereof is omitted. The difference will be described.

  The pin 15 of the second embodiment has a ring-shaped elastic body 15b attached to its end as shown in FIG. 2 in a cross section along the pin axis. The pin insertion groove 14b formed in the holder 14 is configured to contact via a ring-shaped elastic body 15b.

  Even with this configuration, even when vibration is transmitted between the pin 15 and the pin insertion groove 14b when the vehicle is running, the vibration is absorbed and attenuated by the ring-shaped elastic body 15b made of an elastic material. The contact surface between the insertion groove 14b is not crushed, the meshing surface of the rack teeth and pinion teeth is stabilized, and an increase in backlash and generation of rattling noise (rattle noise) can be suppressed. it can.

[Third Embodiment]
FIG. 3 is an enlarged cross-sectional view seen from the axial direction of the rack shaft for explaining the configuration of the rack guide of the rack and pinion type steering apparatus according to the third embodiment of the present invention. The difference from the first embodiment shown in FIG. 1 resides in the configuration of the pin insertion groove 14b, and the others are the same as in the first embodiment. The difference will be described.

  The pin insertion groove 14b of the third embodiment has an elastic body 14c attached to the bottom surface of the pin insertion groove 14b, as shown in FIG. 3 in the direction along the pin axis. The rack guide holder 14 is configured to contact the bottom surface of the pin insertion groove 14b formed in the rack guide holder 14 via an elastic body 14c.

  Even with this configuration, even if vibration is transmitted between the pin 15 and the pin insertion groove 14b during vehicle travel, the vibration is absorbed and attenuated by the elastic body 14c, and the contact surface between the pin 15 and the pin insertion groove 14b. Can be prevented from being crushed, the meshing surfaces of the rack teeth and pinion teeth can be stabilized, and an increase in backlash and generation of rattling noise can be suppressed. Moreover, generation of sound due to contact between the pin 15 and the pin insertion groove 14b can be suppressed.

[Fourth Embodiment]
FIG. 4 is a cross-sectional view for explaining the configuration of a rack guide of a rack and pinion type steering apparatus according to a fourth embodiment of the present invention. FIG. 4A is an enlarged view of the rack guide viewed from the axial direction of the rack shaft. 4B is a cross-sectional view of the rack guide holder as viewed from the axial direction of the pin, and FIG. 4C is an enlarged cross-sectional view illustrating a contact state between the rack guide holder and the pin.

  The fourth embodiment is the same as that of the first embodiment because the configuration of the pin insertion groove of the pin 15 and the rack guide holder 14 is different from that of the first embodiment. The same reference numerals are given to the members, and detailed description thereof is omitted, and differences will be described.

  The center portion 15 c of the pin 15 is formed in a circular cross section and is configured to rotatably support the roller 17 via the needle bearing 16. Further, at both ends of the pin 15 and the vicinity thereof, a contact surface 15d is formed which is a flat surface in which a part of a circular cross section is cut off along a plane parallel to the pin axis. That is, the cross-section of the pin 15 is cylindrical at the center, and the cross-section of both ends and the vicinity thereof is squirrel-shaped.

  On the other hand, the rack guide holder 14 is a member whose outer shape is formed in a substantially cylindrical shape, and has a semi-cylindrical bottom surface in a central portion thereof along the shape of the roller 17 accommodated therein. An internal space 14a made of a hole having a rectangular cross section is formed on the pin, and a pin insertion groove 14b made of a groove having a rectangular cross section is formed on the left and right in the diameter direction of the rack guide holder 14 in the internal space 14a. The contact surface 14d is formed on the bottom surface of the pin 15 so as to come into contact with both end portions of the pin 15 and the contact surface 15d formed in the vicinity thereof.

  Then, the elastic body M is provided on one or both of the contact surface 14d of the pin insertion groove 14b and the contact surface 15d of the pin 15 by means such as adhesion.

  According to this configuration, the contact surface 15d formed at both ends of the pin 15 and the vicinity thereof and the contact surface 14d of the pin insertion groove 14b of the rack guide holder 14 are in surface contact via the elastic body M. Compared with the conventional line contact, the area dramatically increases, the contact surface pressure decreases, and vibration is absorbed and attenuated by the elastic body M, so that the contact surface between the pin 15 and the pin insertion groove 14b is pushed. It is not crushed, and the meshing surfaces of the rack teeth and the pinion teeth can be stabilized, and an increase in backlash and generation of rattling noise (rattle noise) can be suppressed.

[Fifth Embodiment]
FIG. 5 is a sectional view for explaining the configuration of a rack guide of a rack and pinion type steering apparatus according to a fifth embodiment of the present invention. FIG. 5A is an enlarged view of the rack guide as seen from the axial direction of the rack shaft. FIG. 5B is a cross-sectional view of the rack guide holder as viewed from the axial direction of the pin, and FIG. 5C is an enlarged cross-sectional view illustrating the contact state between the rack guide holder and the pin.

  The fifth embodiment is the same as that of the first embodiment because the configuration of the pin insertion groove of the pin 15 and the rack guide holder 14 is different from that of the first embodiment. The same reference numerals are given to the members, and detailed description thereof is omitted, and differences will be described.

  The fifth embodiment is the same as that of the first embodiment because the configuration of the pin insertion groove of the pin 15 and the rack guide holder 14 is different from that of the first embodiment. The same reference numerals are given to the members, and detailed description thereof is omitted, and differences will be described.

  The center portion 15 e of the pin 15 has a circular cross section and is configured to rotatably support the roller 17 via the needle bearing 16. Further, at both ends of the pin 15 and the vicinity thereof, a contact surface 15f is constituted by a convex line constituted by two planes arranged symmetrically in a left-right symmetrical V-shaped cross section (for example, an angle of 45 °). The tip can be slightly rounded if necessary.

  On the other hand, the rack guide holder 14 is a member whose outer shape is formed in a substantially cylindrical shape, and has a semi-cylindrical bottom surface in a central portion thereof along the shape of the roller 17 accommodated therein. An internal space 14a made of a hole having a rectangular cross section is formed above, pin insertion grooves 14b are formed on the left and right of the inner space 14a in the diameter direction of the rack guide holder 14, and the bottom surface of the pin insertion groove 14b has a V-shaped cross section. A groove-shaped contact surface 14e configured by two planes arranged at an angle (for example, an angle of 45 °) is formed.

  Then, the elastic body M is provided on one or both of the contact surface 14e of the pin insertion groove 14b and the contact surface 15f of the pin 15 by means such as adhesion.

  According to this configuration, the contact surface 15f formed of a convex strip having an inverted V-shaped cross section (for example, an angle of 45 °) formed at both ends of the pin 15 and the vicinity thereof, and the pin insertion groove 14b of the rack guide holder 14 are formed. Since the contact surface 14e having a V-shaped cross section (for example, an angle of 45 °) is in surface contact via the elastic body M, the contact area is greatly increased as compared with the conventional line contact, and the contact surface pressure is increased. Besides being reduced, the vibration is absorbed and damped by the elastic body M, the contact surface between the pin 15 and the pin insertion groove 14b is not crushed, and the meshing surface between the rack tooth and the pinion tooth is stabilized. , Increase in backlash and generation of rattling noise can be suppressed.

  A rack and pinion type steering device equipped with a rack guide that prevents deformation of the rack guide holder and prevents rattle noise, and an elastic body is interposed between the rack guide holder and the pin that holds the roller to make contact. Provided is a rack and pinion type steering device having a rack guide that can reduce surface pressure and absorb and attenuate vibration of a contact surface to prevent deformation of a rack guide holder and prevent rattle noise.

The expanded sectional view seen from the axial direction of the rack axis | shaft explaining the structure of the rack guide of the rack and pinion type steering device of 1st Embodiment. The expanded sectional view seen from the axial direction of the rack axis | shaft explaining the structure of the rack guide of the rack and pinion type steering device of 2nd Embodiment. The expanded sectional view seen from the axial direction of the rack axis | shaft explaining the structure of the rack guide of the rack and pinion type steering device of 3rd Embodiment. Sectional drawing explaining the structure of the rack guide of the rack and pinion type steering device of 4th Embodiment. Sectional drawing explaining the structure of the rack guide of the rack and pinion type steering device of 5th Embodiment. Sectional drawing explaining the structure of a rack and pinion type steering device. Sectional drawing explaining the structure of the conventional gear device of a rolling form. Sectional drawing explaining the structure of the rack guide of the conventional rolling-type gear apparatus. Sectional drawing explaining the structure of the rack guide of the rolling type which interposed the bush provided with the elastic body between the conventional roller and a pin. Sectional drawing explaining the structure of the roller which inserted the bush provided with the elastic body in the conventional roller and pin insertion hole. Sectional drawing which shows an example of the attachment bolt which fixes the conventional rack housing to a vehicle body frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Gear housing 11a Rack guide guide part 12 Rack shaft 13 Rack guide 14 Rack guide holder 14a Internal space 14b Pin insertion groove 14c Elastic body 14d Contact surface (plane contact surface)
14e Contact surface (groove-shaped contact surface with V-shaped cross section)
15 pin 15a O-ring 15b ring-shaped elastic body 15c center part (center part of pin)
15d Contact surface (flat contact surface)
15e Center part (pin center part)
15f Contact surface (contact surface of convex V-shaped cross section)
16 Needle bearing 17 Roller 18 Belleville spring 19 Adjustment screw M Elastic body

Claims (7)

In a rack and pinion type steering device provided with a rolling rack guide that presses the back of the rack shaft toward the meshing direction of the rack and pinion with a roller,
The rack guide is disposed so as to be movable in the meshing direction of the rack and the pinion, and a rack guide holder in which a pin insertion groove is formed, and the roller is rotatably mounted. The rack guide holder The pin is arranged in the pin insertion groove of
A rack and pinion type steering device, wherein an elastic body is disposed on one or both of the surface side of the pin and the pin insertion groove side at the contact portion between the pin and the pin insertion groove of the rack guide holder. . The rack and pinion type steering apparatus according to claim 1, wherein the elastic body disposed on the surface side of the pin is an O-ring attached to the pin. The rack and pinion type steering apparatus according to claim 1, wherein the elastic body disposed on the surface side of the pin is a ring-shaped elastic body mounted on the pin. 2. The rack and pinion type steering device according to claim 1, wherein the elastic body disposed on the pin insertion groove side is an elastic body mounted on a bottom surface on the pin insertion groove side. In a rack and pinion type steering device provided with a rolling rack guide that presses the back of the rack shaft toward the meshing direction of the rack and pinion with a roller,
The rack guide is disposed so as to be movable in the meshing direction of the rack and the pinion, and a rack guide holder in which a pin insertion groove is formed, and the roller is rotatably mounted. The rack guide holder The pin is arranged in the pin insertion groove of
In the configuration in which each of the pin insertion groove and the pin of the rack guide holder includes a contact surface formed in a plane, and a load acting on the roller is supported by the contact surface.
A rack and pinion type steering apparatus, wherein an elastic body is disposed between the contact surface on the pin insertion groove side and the contact surface on the pin side. 6. The rack according to claim 5, wherein the pin has a circular contact surface formed in a flat shape with a central portion having a circular cross section and a portion near both ends in the pin axis direction being cut in parallel with the pin axis. Pinion type steering device. The pin insertion groove of the rack guide holder has a groove-shaped contact surface composed of two flat surfaces arranged in a V-shaped cross section, and the pin has a circular cross section at the center and the vicinity of both ends in the pin axial direction. 6. The rack and pinion type steering device according to claim 5, further comprising a contact surface made of a convex line composed of two flat surfaces arranged in an inverted V-shaped cross section.

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