Steering device

Abstract

Regarding the turning device involved in one aspect of the present disclosure, the holding portion in the driven cam held in the tilting guide hole has: a locking contact portion, which is toward one side of the bolt circumferential direction, in contact with the inner periphery of the tilting guide hole when in the locked state, thereby limiting the rotation of the driven cam relative to the rear plate portion to one side of the bolt circumferential direction; and a release contact portion, which is toward the other side of the bolt circumferential direction, in contact with the inner periphery of the tilting guide hole when in the lock release state, thereby limiting the rotation of the driven cam relative to the rear plate portion to the other side of the bolt circumferential direction.

Description

Technical Field

[0001] This disclosure relates to steering mechanisms. Background Technology

[0002] Regarding steering systems, there are steering systems with tilting functions. The tilting function is the ability to adjust the tilt angle (angle of tilt relative to the horizontal plane) of the steering shaft based on the driver's physique or driving posture. The steering system uses a column unit to hold the steering shaft rotatably about an axis in the longitudinal direction. The front end of the column unit is supported by a front bracket, which is rotatable about an axis in the lateral direction. The rear end of the column unit is supported by a rear bracket via a rod. Specifically, a tilting guide hole extending vertically is formed in the rear bracket. In the steering system, as the rod rotates relative to the front bracket, it moves vertically within the tilting guide hole, thereby adjusting the tilt angle of the column unit (steering shaft).

[0003] The steering device with tilting function is equipped with a locking mechanism. The locking mechanism switches between a locked state that restricts the rotation of the column unit relative to the front support and a unlocked state that allows the column unit to rotate relative to the front support. For example, in Patent Document 1 below, a locking mechanism is disclosed that includes a drive cam fixed to the bar and a driven cam held in the rear support. The driven cam prevents rotation relative to the rear support by an engaging protrusion held in the tilting guide hole.

[0004] According to this configuration, as the rod rotates, the drive cam and the driven cam slide against each other and rotate relative to each other, thereby increasing or decreasing the distance between the drive cam and the driven cam. At this time, by increasing the distance between the drive cam and the driven cam, the column unit is secured by the rear bracket. As a result, the steering mechanism is in a locked state. By decreasing the distance between the drive cam and the driven cam, the securing of the column unit based on the rear bracket is released. As a result, the steering mechanism is in a locked-out state.

[0005] Prior art literature

[0006] Patent documents

[0007] Patent document 1: Japanese Patent Application Publication No. 2009-196436. Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] However, when switching between the locked and unlocked states of the locking mechanism, due to friction between the driving cam and the driven cam, the driven cam will rotate accordingly, corresponding to the gap between the inner periphery of the tilt guide hole and the outer periphery of the engaging protrusion. At this time, as the driven cam rotates, the engaging protrusion collides with the inner periphery of the tilt guide hole, potentially creating an indentation on the inner periphery. If the column unit moves up and down while an indentation is present on the inner periphery of the tilt guide hole, the engaging protrusion may become stuck in the indentation as it passes through it. This sticking can cause abnormal noises or discomfort to the user when adjusting the tilt position.

[0010] This disclosure provides a steering mechanism that can give the user a good sense of control.

[0011] Solution for solving the problem

[0012] To address the aforementioned issues, this disclosure adopts the following form.

[0013] (1) One aspect of the present disclosure relates to a steering device comprising: a column unit that supports a steering shaft rotatably about a first axis in the longitudinal direction; a front bracket that is mounted on a vehicle body while supporting the column unit rotatably about a second axis in the left-right direction; a rear bracket that has side plate portions located on both sides of the column unit in the left-right direction and having inclined guide holes extending in an arc shape centered on the second axis, and is mounted on the vehicle body behind the front bracket; and a locking mechanism that switches between a locked state that restricts the movement of the column unit relative to the front bracket about the second axis and a locked-out state that allows the column unit to move relative to the front bracket about the second axis. The aforementioned locking mechanism comprises: a rod, which, in a state where it passes through the aforementioned column unit and the aforementioned tilting guide hole in the aforementioned left-right direction, is rotatably supported by the aforementioned column unit about a third axis in the aforementioned left-right direction; a drive cam, which has a cam portion fixed to the aforementioned rod; and a driven cam, which has a holding portion held inside the aforementioned tilting guide hole and a cam follower portion facing the aforementioned cam portion in the aforementioned left-right direction outside the aforementioned tilting guide hole and sliding in the aforementioned cam portion as the aforementioned rod rotates. One of the aforementioned cam portion and the aforementioned cam follower portion comprises: a locking position limiting surface, which, when in the aforementioned locked state, engages with the other component of the aforementioned cam portion and the aforementioned cam follower portion; and a releasing position limiting surface, which is provided away from the aforementioned locking position limiting surface in the circumferential direction about the aforementioned third axis, and engages with the aforementioned other component when in the aforementioned unlocked state. The aforementioned retaining portion includes: a locking contact portion facing the aforementioned circumferential direction, which, when in the aforementioned locked state, contacts the inner periphery of the aforementioned tilting guide hole, thereby restricting the rotation of the aforementioned driven cam relative to the aforementioned side plate portion about the aforementioned third axis; and a releasing contact portion facing the other side of the aforementioned circumferential direction, which, when in the aforementioned unlocked state, contacts the inner periphery of the aforementioned tilting guide hole, thereby restricting the rotation of the aforementioned driven cam relative to the aforementioned side plate portion about the aforementioned third axis. The aforementioned releasing contact portion is formed in an arc shape with a radius of curvature larger than that of the aforementioned locking contact portion.

[0014] During the transition of the locking mechanism from the locked state to the unlocked state, the retaining part rotates in accordance with the gap between the inner periphery of the tilting guide hole and the outer periphery of the retaining part. As a result, the retaining part is pressed into the inner periphery of the tilting guide hole via the release contact part.

[0015] Therefore, according to this design, the release contact portion is formed in an arc shape with a larger radius of curvature than the locking contact portion, thereby reducing the surface pressure (surface pressure) acting between the release contact portion and the inner periphery of the tilt guide hole compared to the surface pressure acting between the locking contact portion and the inner periphery of the tilt guide hole. As a result, the steering device of this design can suppress the formation of indentations or other defects on the inner periphery of the tilt guide hole. Consequently, even when the retaining portion slides on the inner periphery of the tilt guide hole during changes in tilt position, the steering device of this design reduces abnormal noise and user discomfort. Therefore, it provides a better user experience.

[0016] (2) In the steering device of the form described in (1) above, the aforementioned locking contact portion may protrude toward the inner periphery of the aforementioned tilting guide hole relative to the aforementioned releasing contact portion.

[0017] According to this design, in the locked state, the locking contact can be reliably pushed against the inner periphery of the tilt guide hole. Therefore, in the locked state, the steering device of this design ensures that the frictional force acting between the locking contact and the inner periphery of the tilt guide hole can suppress unintended up-and-down movement of the column unit.

[0018] Furthermore, with the release contact portion formed in an arc shape, the steering device of this configuration can adjust the gap between the outer peripheral surface of the retaining portion and the inner peripheral edge of the tilt guide hole by the amount of protrusion of the locking contact portion. Therefore, it is possible to suppress loosening of the retaining portion within the tilt guide hole.

[0019] (3) In the steering device of the form described in (1) or (2) above, a pair of the aforementioned locking contact portions may be provided between the aforementioned third axis in the aforementioned holding portion. A pair of the aforementioned releasing contact portions may also be provided between the aforementioned third axis in the aforementioned holding portion.

[0020] According to this embodiment, the retaining part is pushed against the inner periphery of the tilt guide hole at a diagonal position between which the third axis is sandwiched. Therefore, the steering device of this embodiment can stably hold the retaining part within the tilt guide hole in both the locked and unlocked states, and can disperse the surface pressure acting between the retaining part and the inner periphery of the tilt guide hole. As a result, the formation of indentations or the like on the inner periphery of the tilt guide hole can be more reliably suppressed.

[0021] (4) In the steering device of the form described in (3) above, the driven cam may also have a base portion located on the outside relative to the tilting guide hole and having the cam follower portion formed therein. Alternatively, in the base portion, a display portion for determining the mounting orientation of the holding portion around the third axis may be provided in a portion of the circumferential direction.

[0022] According to this design, the mounting orientation of the driven cam can be easily fixed among the various steering mechanisms. Therefore, the steering mechanism of this design can suppress deviations in the contact conditions between the retaining portion (release contact portion and locking contact portion) and the inner periphery of the tilt guide hole caused by manufacturing deviations of the driven cam among the various steering mechanisms. As a result, performance deviations in the locking mechanism can be suppressed.

[0023] The effects of the invention

[0024] Based on the above-mentioned forms, a good user experience can be provided. Attached Figure Description

[0025] Figure 1 This is a perspective view of the steering device involved in the implementation method.

[0026] Figure 2 Is with Figure 1 The cross-sectional view corresponding to line II-II.

[0027] Figure 3 Is with Figure 1 The cross-sectional view corresponding to line III-III.

[0028] Figure 4 Is with Figure 2 The cross-sectional view corresponding to line IV-IV.

[0029] Figure 5 This is a 3D diagram of a cam mechanism.

[0030] Figure 6 This is a diagram of the unfolded cam mechanism.

[0031] Figure 7 This is an explanatory diagram of the operation of the steering device involved in the implementation method.

[0032] Figure 8 This is an explanatory diagram of the operation of the steering device involved in the implementation method.

[0033] Figure 9 This is an explanatory diagram of the operation of the steering device involved in the implementation method.

[0034] Figure 10 This is an explanatory diagram of the operation of the steering device involved in the implementation method. Detailed Implementation

[0035] Next, embodiments of the present disclosure will be described based on the accompanying drawings. In the embodiments or variations described below, the same reference numerals are sometimes used for corresponding configurations and descriptions are omitted. Furthermore, in the following description, expressions such as "parallel" or "orthogonal," "center," "coaxial," etc., indicating relative or absolute configurations, not only refer to such strict configurations, but also to states of relative displacement of angles or distances with tolerances or to the extent that the same function can be obtained.

[0036] [Steering mechanism 1]

[0037] Figure 1 This is a three-dimensional view of the steering device 1.

[0038] like Figure 1 As shown, the steering device 1 is mounted on the vehicle. The steering device 1 adjusts the steering angle (rudder angle) of the wheels in conjunction with the rotation of the steering wheel 2.

[0039] The steering device 1 includes a column unit 11, a steering shaft 12, brackets (front bracket 13 and rear bracket 14), and an adjustment mechanism 15. The column unit 11 and the steering shaft 12 are each formed in a cylindrical shape disposed on a first axis O1. Therefore, in the following description, the direction in which the first axis O1 extends for the column unit 11 and the steering shaft 12 is sometimes referred to only as the axial direction, the direction orthogonal to the first axis O1 is referred to as the radial direction, and the direction around the first axis O1 is referred to as the circumferential direction.

[0040] In this embodiment, the steering device 1 is mounted on a vehicle with its first axis O1 tilted relative to the longitudinal direction. Specifically, the first axis O1 of the steering device 1 extends upward as it faces rearward. In the following description, for convenience, in the steering device 1, the direction toward the steering wheel 2 in the axial direction will be referred to only as rearward, and the direction toward the side opposite to the steering wheel 2 will be referred to only as forward (arrow FR). In the radial direction, the vertical direction when the steering device 1 is mounted on the vehicle will be referred to only as vertical (arrow UP indicates upward), and the horizontal direction will be referred to only as horizontal.

[0041] <Column Unit 11>

[0042] Figure 2 It is along Figure 1 A cross-sectional view of line II-II.

[0043] like Figure 1 , Figure 2 As shown, column unit 11 has an outer column 21 and an inner column 22.

[0044] The outer pillar 21 is mounted to the vehicle body via brackets 13 and 14. The outer pillar 21 has a retaining sleeve portion 24 and a fastening portion 25.

[0045] The retaining cylinder 24 is formed in a cylindrical shape extending along the first axis O1. At the rear of the retaining cylinder 24, a slit 28 is formed in a portion in the circumferential direction (in this embodiment, the lower part of the outer post 21). The slit 28 extends through the outer post 21 in the axial radial direction and opens at the rear end face of the outer post 21.

[0046] like Figure 2 As shown, the fastening portions 25 extend downward from positions facing each other in the left-right direction within the retaining cylinder portion 24, where the slit 28 is sandwiched between them. Each fastening portion 25 has a through hole 31 extending through it in the left-right direction.

[0047] Figure 3 It is along Figure 1 A cross-sectional view of line III-III.

[0048] like Figure 3 As shown, the inner column 22 is formed in a cylindrical shape extending along the first axis O1. The outer diameter of the inner column 22 is smaller than the inner diameter of the retaining cylinder 24. The inner column 22 is inserted into the retaining cylinder 24. The inner column 22 is configured to be movable relative to the retaining cylinder 24 in the axial direction. Bearings 34 are installed in the inner column 22 at the front and rear ends by pressing or the like.

[0049] <Steering Axle 12>

[0050] The steering shaft 12 includes a rear axle 40 and a front axle 41. The rear axle 40 is inserted into the inner pillar 22. The rear axle 40 is rotatably supported within the inner pillar 22 via a bearing 34 about a first axis O1. The rear end of the rear axle 40 protrudes rearward through a rear end opening of the inner pillar 22. Steering wheel 2 (see reference) Figure 1 It is connected to the rear end of the rear axle 40.

[0051] The front axle 41 is connected to the front end of the rear axle 40 via a first universal joint 43. That is, the front axle 41 is configured to swing relative to the rear axle 40. The front end of the front axle 41 is connected to the steering gearbox (not shown) via a second universal joint (not shown). In the steering device 1, the rotational force of the steering shaft 12 is transmitted to the steering gearbox, thereby steering the wheels.

[0052] <Staff 13, 14>

[0053] like Figure 1As shown, the front bracket 13 connects the outer pillar 21 to the vehicle body via a pivot 50. In a frontal view taken from the axial direction, the front bracket 13 is formed in a downward-opening U-shape. The front bracket 13 surrounds the front end of the outer pillar 21 from above and from both sides in the left and right directions. The front side plate portions 13a on both sides of the front bracket 13 in the left and right directions are connected to the front end of the outer pillar 21 via the pivot 50. The outer pillar 21 is rotatably supported by the front bracket 13 about a second axis O2 extending left and right in a second direction centered on the pivot 50.

[0054] The rear bracket 14 is connected between the outer pillar 21 and the vehicle body via locking bolts (bars) 80. In a frontal view taken from the axial direction, the rear bracket 14 is formed in a downward-opening U-shape. The rear bracket 14 surrounds the outer pillar 21 from above and from both sides in the left and right directions. Specifically, the rear bracket 14 has rear side plate portions (side plate portions) 54 disposed on the left and right sides relative to the pillar unit 11, and bridge portions 55 connecting the rear side plate portions 54 to each other.

[0055] Figure 4 Is with Figure 2 The cross-sectional view corresponding to line IV-IV.

[0056] like Figure 4 As shown, each rear side plate 54 has a tilting guide hole 56 extending through it in the left-right direction. The tilting guide hole 56 is an elongated hole extending in the up-down direction. Specifically, the tilting guide hole 56 is formed in an arc shape protruding rearward with the second axis O2 as the center of curvature. A locking bolt 80 passes through the tilting guide hole 56 in the left-right direction. That is, during the tilting action of the column unit 11 (the adjustment of the angle of the column unit 11 around the second axis O2), the locking bolt 80 moves up and down within the tilting guide hole 56.

[0057] like Figure 1 , Figure 2 As shown, the bridge portion 55 connects the upper ends of each rear side plate portion 54 to each other. The bridge portion 55 is formed in an arch shape that protrudes upward. When the column unit 11 tilts, the bridge portion 55 is located on the rotation trajectory of the column unit 11. That is, when the column unit 11 tilts, the column unit 11 approaches or separates from the bridge portion 55 from below.

[0058] <Adjustment of Institution 15>

[0059] The adjustment mechanism 15 adjusts the position of the inner pillar 22 (and the steering shaft 12) relative to the outer pillar 21 in the longitudinal direction (telescopic position) and the position of the pillar unit 11 relative to the front bracket 13 around the second axis O2 (tilt position). Specifically, the adjustment mechanism 15 includes a suspension bracket 60 and a locking mechanism 61.

[0060] The suspension bracket 60 is fixed downward on the outer circumferential surface of the inner column 22. The suspension bracket 60 is formed, for example, by stamping a metal sheet. In a frontal view, the suspension bracket 60 is formed in a U-shape with an upward opening. The suspension bracket 60 has a pair of opposing wall portions 60a facing each other in the left-right direction. The upper edges of the opposing wall portions 60a are fixed to the inner column 22 by welding or the like.

[0061] The suspension bracket 60 protrudes from the outside of the retaining cylinder 24 through the slit 28 of the retaining cylinder 24. A telescopic guide hole 60b is formed in the opposing wall portion 60a. The telescopic guide hole 60b is an elongated hole with the axial direction of the shaft as its major axis. In a portion of the axial direction, the telescopic guide hole 60b coincides with the through hole 31 when viewed from the left-right direction.

[0062] The locking mechanism 61 includes a locking bolt 80, an operating lever 81, and a cam mechanism 82.

[0063] The locking bolt 80 passes through the tilting guide hole 56, the through hole 31, and the telescopic guide hole 60b in the left-right direction, penetrating each rear side plate 54, the fastening part 25, and the suspension bracket 60. During telescopic movement, the locking bolt 80 moves back and forth within the telescopic guide hole 60b, thereby causing the inner column 22 to move back and forth. During tilting movement, the locking bolt 80 moves up and down within the tilting guide hole 56, thereby moving up and down together with the column unit 11. In the following description, the direction orthogonal to the third axis O3 is sometimes referred to as the bolt radial direction, and the direction around the third axis O3 is referred to as the bolt circumferential direction.

[0064] A biasing component 85 is positioned between the locking bolt 80 and the suspension bracket 60. The biasing component 85 is, for example, a double torsion spring. The biasing component 85 biases the column unit 11 upwards via the suspension bracket 60.

[0065] The operating lever 81 extends rearward from the locking bolt 80 in a cantilevered manner. Specifically, the base end (front end) of the operating lever 81 is connected to the left end (second side end in the left-right direction) of the locking bolt 80. The operating lever 81 is configured to be able to rotate together with the locking bolt 80 about the third axis O3 by pressing down or pulling up via the top end (rear end).

[0066] Figure 5 This is a 3D view of the cam mechanism 82.

[0067] like Figure 2 , Figure 5As shown, the cam mechanism 82 is positioned between the operating lever 81 and a (left) rear side plate portion 54. The cam mechanism 82 is configured such that its thickness changes in the left-right direction as the operating lever 81 is rotated. In the steering device 1, the thickness change of the cam mechanism 82 causes each fastening part 25 to approach or separate from each other via each rear side plate portion 54 in the left-right direction (in order to expand or shrink the size of the slit 28 in the left-right direction). Specifically, rotating the operating lever 81 increases the thickness of the cam mechanism 82, causing each fastening part 25 to approach each other and each rear side plate portion 54 together, thus reducing the diameter of the retaining cylinder portion 24. As a result, the inner column 22 is clamped by the retaining cylinder portion 24, and the extension and tilting movements are restricted (locked state). In the locked state, rotating the operating lever 81 decreases the thickness of the cam mechanism 82, causing the fastening parts 25 to separate from each other and each rear side plate portion 54 together, thus expanding the diameter of the retaining cylinder portion 24. As a result, the clamping of the inner column 22 based on the retaining cylinder 24 is released, and the telescopic and tilting movements are permitted (lock-out state).

[0068] <Cam Mechanism 82>

[0069] The cam mechanism 82 has a drive cam 90 and a driven cam 91.

[0070] The drive cam 90 is integrally fixed to the base end of the operating lever 81 by means of, for example, insert forming. The drive cam 90 is formed of a material with a higher hardness than the rear side plate portion 54 (e.g., a sintered material of ferrous type).

[0071] The drive cam 90 has a drive base 100 and multiple cam sections 101.

[0072] The drive base 100 is formed in the shape of a circular plate arranged coaxially with the third axis O3. In the drive base 100, a through hole 100a is formed at the center of the bolt in the radial direction (see reference). Figure 2 A plurality of recesses 100b are formed on the outer periphery of the drive base 100. The recesses 100b penetrate the drive base 100 in the left-right direction and open on the outer periphery of the drive base 100. The plurality of recesses 100b are arranged at intervals along the circumferential direction of the bolt. With the drive base 100 embedded in the base end of the operating lever 81, the drive cam 90 is fixed to the operating lever 81.

[0073] The cam portion 101 is provided on the outer periphery of the drive base 100, between adjacent recesses 100b. With the drive base 100 embedded in the operating lever 81, the cam portion 101 protrudes from the operating lever 81 toward the right (the first side in the left-right direction). Since each cam portion 101 has the same configuration, the following description will use one cam portion 101 as an example.

[0074] The cam portion 101 is formed in a trapezoidal shape when viewed from the radial direction of the bolt. Regarding the cam portion 101, the dimension in the circumferential direction of the bolt gradually decreases from the base end side to the top end side (from the left side to the right side). In this embodiment, the cam portion 101 is formed linearly symmetrically in the circumferential direction of the bolt.

[0075] Figure 6 This is the unfolded diagram of cam mechanism 82.

[0076] like Figure 6 As shown, when viewed from the radial direction of the bolt, the circumferential surface of the cam portion 101 has an engaging surface (second side surface) 101a, a retraction surface (first side surface) 101b, and a sliding surface (top surface) 101c.

[0077] The engagement surface 101a is the side of the circumferential surface of the cam portion 101 facing the bolt circumferential direction. The engagement surface 101a is an inclined surface that is inclined relative to the surface of the drive base 100 (the surface facing the driven cam 91). Specifically, the engagement surface 101a extends towards the bolt circumferential direction from the top end of the cam portion 101. The angle of the engagement surface 101a relative to the imaginary line L1 extending along the surface of the drive base 100 in the bolt circumferential direction is set as θ1. The angle θ1 of the engagement surface 101a can also be a right angle, etc.

[0078] The retraction surface 101b is an inclined surface that extends toward the bolt circumferential direction from the top end of the cam portion 101. The angle θ2 of the retraction surface 101b relative to the imaginary line L1 is the same as the angle θ1 of the engagement surface 101a. The angles θ1 and θ2 may also be different.

[0079] The sliding surface 101c connects the top ends of the engaging surface 101a and the retracting surface 101b to each other. The sliding surface 101c is formed to face to the right. Figure 6 The curved surface protruding from the arrow RH in the diagram. The sliding surface 101c can be relative to the engaging surface 101a and the retraction surface 101b via an edge (e.g., Figure 9 The edge portion P) in the middle can be connected, or it can be connected via a curved surface.

[0080] like Figure 5 As shown, the driven cam 91 is disposed between the drive cam 90 and the rear side plate portion 54. A through hole 91a is formed in the driven cam 91, extending through the driven cam 91 in the left-right direction. With the locking bolt 80 passing through the through hole 91a, the driven cam 91 is mounted on the rear side plate portion 54. Therefore, with the rotation of the operating lever 81, the drive cam 90 rotates around the third axis O3 (in the circumferential direction of the bolt), thereby causing the driven cam 91 to rotate relative to the drive cam 90.

[0081] The driven cam 91 includes a retaining portion 110, a driven base (base portion) 111, and a plurality of cam follower portions 112. The retaining portion 110 is housed within a tilting guide hole 56. The retaining portion 110 functions as an anti-rotation member that limits the rotation of the driven cam 91 relative to the rear side plate portion 54 about the third axis O3 by contacting the inner periphery of the tilting guide hole 56. The retaining portion 110 is formed in a generally elongated oval shape with the vertical direction as the major axis when viewed from the left-right direction. A through hole 91a passes through the center of the retaining portion 110.

[0082] like Figure 4 As shown, the outer peripheral surface of the holding part 110 includes a rising limiting surface 110a, a falling limiting surface 110b, a first rotation limiting surface 110c, and a second rotation limiting surface 110d.

[0083] The upward limiting surface 110a is the upward-facing surface of the outer peripheral surface of the retaining portion 110. The upward limiting surface 110a is formed as a curved surface that bulges upward. Preferably, the radius of curvature of the upward limiting surface 110a is set to be equal to the upper opening edge of the tilting guide hole 56.

[0084] The downward limiting surface 110b is the downward-facing surface of the outer peripheral surface of the retaining part 110. The downward limiting surface 110b is formed as a downward-protruding curved surface. Preferably, the radius of curvature of the downward limiting surface 110b is set to be equal to the lower opening edge of the tilting guide hole 56. The radius of curvature of each limiting surface 110a, 110b can be appropriately changed.

[0085] The first rotation limiting surface 110c is positioned between the rear ends of the rising limiting surface 110a and the falling limiting surface 110b. The first rotation limiting surface 110c has a first release contact portion 115 and a first locking contact portion 117.

[0086] The first release contact portion 115 forms the upper part of the first rotation limiting surface 110c. The first release contact portion 115 is connected from the first end of the rising limiting surface 110a via a bend 118. The first release contact portion 115 is formed as a curved surface protruding rearward. The radius of curvature of the first release contact portion 115 is larger than the radius of curvature of the first locking contact portion 117, but smaller than the radius of curvature of the tilting guide hole 56 (radius of curvature R = approximately 32 mm). In the illustrated example, the first release contact portion 115 is formed over approximately two-thirds of the area of ​​the first rotation limiting surface 110c from the upper end.

[0087] The first locking contact portion 117 forms the lower portion of the first rotation limiting surface 110c. The first locking contact portion 117 is formed as a curved surface protruding rearward relative to the first releasing contact portion 115. The radius of curvature of the first locking contact portion 117 is smaller than the radius of curvature of the descending limiting surface 110b. The upper end of the first locking contact portion 117 is connected to the first releasing contact portion 115. The lower end of the first locking contact portion 117 is smoothly connected to the front end of the descending limiting surface 110b. In this embodiment, the configuration in which the first releasing contact portion 115 and the first locking contact portion 117 are directly connected has been described, but it is also possible to have a flat surface between the first releasing contact portion 115 and the first locking contact portion 117.

[0088] The second rotation limiting surface 110d is positioned between the front ends of the rising limiting surface 110a and the falling limiting surface 110b. The second rotation limiting surface 110d is formed in the retaining portion 110 at a point symmetrical with respect to the first rotation limiting surface 110c, with the third axis O3 as the object axis. That is, with respect to the second rotation limiting surface 110d, the second release contact portion 121 and the second locking contact portion 123 are connected from below to above. Therefore, the retaining portion 110 has a pair of release contact portions 115 and 121 arranged diagonally between the third axis O3 and facing the other side in the bolt circumferential direction. The retaining portion 110 has a pair of locking contact portions 117 and 123 arranged diagonally between the third axis O3 and facing the other side in the bolt circumferential direction.

[0089] like Figure 5 As shown, the driven base 111 is connected to the left side of the retaining portion 110. The driven base 111 is located outside the tilting guide hole 56 and is disposed along the outer surface of the rear side plate portion 54. The driven base 111 is formed in the shape of a circular plate arranged coaxially with the third axis O3 when viewed from the left and right directions. A through hole 91a passes through the center of the driven base 111.

[0090] A display portion 127 is formed on a portion of the outer peripheral surface of the driven base 111 in the bolt circumferential direction. The display portion 127 is used to determine the mounting orientation of the driven cam 91 toward the rear side plate portion 54 in the vertical direction. The display portion 127 is a slot that opens onto the outer peripheral surface of the driven base 111 and extends through the driven base 111 in the horizontal direction. In this embodiment, the display portion 127 is formed in the downward-facing portion of the outer peripheral surface of the driven base 111. The display portion 127 may also be formed in the upward-facing portion of the outer peripheral surface of the driven base 111. The display portion 127 is not limited to a slot as long as it is visually identifiable from the bolt radial direction between the operating lever 81 and the rear side plate portion 54. In this case, the display portion 127 may also be, for example, colored.

[0091] A chamfer 128 is formed on at least the right peripheral edge of the outer peripheral surface of the driven base 111. The chamfer 128 is, for example, an R-shaped chamfer. However, the chamfer 128 may also be a C-shaped chamfer, etc.

[0092] like Figure 5 , Figure 6 As shown, the cam follower portion 112 is formed in the follower base 111 at a position facing the cam portion 101 in the left-right direction. The cam follower portion 112 is a concave-convex surface that engages with the cam portion 101. The cam follower portions 112 are arranged at intervals along the circumferential direction of the bolt. Specifically, the cam follower portion 112 includes an upper surface 131, a locking position limiting surface 132, a transition surface 133, a passing surface 134, and a release position limiting surface 135.

[0093] The mounting surface 131 extends along the bolt circumferential direction on the same surface as the driven base 111 (the surface facing the drive cam 90). Regarding the mounting surface 131, when the locking mechanism 61 is in the locked state, the sliding surface 101c abuts in the left-right direction.

[0094] The locking position limiting surface 132 connects to the mounting surface 131 to one side in the bolt circumferential direction. The locking position limiting surface 132 extends to the left relative to the mounting surface 131 (the surface of the driven base 111). When the locking mechanism 61 is in the locked state, the locking position limiting surface 132 faces the engaging surface 101a in the bolt circumferential direction. With respect to the locking position limiting surface 132, the engaging surface 101a abuts against the bolt circumferential direction, thereby limiting the rotation of the drive cam 90 relative to the driven cam 91 in the bolt circumferential direction. In this embodiment, the locking position limiting surface 132 is an inclined surface extending in symmetry with respect to the engaging surface 101a. That is, the angle θ3 of the locking position limiting surface 132 relative to the imaginary line L2 parallel to the imaginary line L1 along the surface of the driven base 111 is set to be equal to the angle θ1 of the engaging surface 101a. The angle θ3 of the locking position limiting surface 132 may also be different from the angle θ1 of the engaging surface 101a.

[0095] The transition surface 133 connects to the other side of the bolt in the circumferential direction from the mounting surface 131. The transition surface 133 is formed on an inclined surface that extends to the right as it faces the other side of the bolt in the circumferential direction. In this embodiment, the transition surface 133 is formed as a curved surface that convexes to the left. Regarding the transition surface 133, when the locking mechanism 61 changes between a locked state and a locked-out state, the sliding surface 101c slides (see reference). Figure 8 ).

[0096] Through surface 134 connects to the other side of the bolt circumferential direction from transition surface 133. Through surface 134 is a flat surface that extends in a straight line along the bolt circumferential direction.

[0097] The release position limiting surface 135 connects to the other side of the bolt circumferential direction from the through surface 134. The release position limiting surface 135 extends to the left relative to the through surface 134. Specifically, the release position limiting surface 135 is formed as an inclined surface extending to the left along the other side of the bolt circumferential direction. In the release position limiting surface 135, the angle θ4 relative to the imaginary line L2 is larger than that of the transition surface 133, and also larger than the angle θ2 of the retraction surface 101b and the angle θ3 of the locking position limiting surface 132. The release position limiting surface 135 is a sliding surface that slides when the locking mechanism 61 is in the locked-out state, with the sliding surface 101c in line contact with the edge portion (boundary portion) P of the retraction surface 101b (see reference). Figure 9 ).

[0098] In adjacent cam follower sections 112, the release position limiting surface 135 of one cam follower section 112 and the locking position limiting surface 132 of the other cam follower section 112 are connected via a connecting surface 138. The connecting surface 138 is a flat surface that extends on the left side of the follower base 111 in the bolt circumferential direction.

[0099] Next, the operation of the steering device 1 described above will be explained mainly based on the operation of the locking mechanism 61. In the following description, the initial state will be when the steering device 1 is in the locked state.

[0100] exist Figure 6 In the locked state shown, regarding the locking mechanism 61, with the locking position limiting surface 132 and the engaging surface 101a abutting in the bolt circumferential direction, the transition surface 133 and the sliding surface 101c abutting in the left-right direction. Therefore, the movement of the driving cam 90 and the driven cam 91 in the bolt circumferential direction on one side and in the left-right direction is restricted. Figure 4 As shown, regarding the driven cam 91, the locking contacts 117 and 123 of the retaining portion 110 abut against the inner periphery of the inclined guide hole 56 in the bolt circumferential direction, thereby restricting the rotation of the rear side plate portion 54 to the bolt circumferential direction.

[0101] In this state, to release the steering mechanism 1 from the locked state, the operating lever 81 is pressed downwards. For example... Figure 6 As shown, the drive cam 90 rotates together with the operating lever 81 relative to the driven cam 91 toward the other side in the bolt circumferential direction. As a result, the cam portion 101 moves relative to the driven cam 91 toward the other side in the bolt circumferential direction.

[0102] like Figure 6 , Figure 7As shown, during the transition from the locked state to the unlocked state, the sliding surface 101c slides on the transition surface 133, while the cam portion 101 moves to the other side in the circumferential direction of the bolt. Consequently, in the left-right direction, the drive base 100 approaches the driven base 111, and the thickness of the cam mechanism 82 in the left-right direction decreases. As a result, the fastening portions 25 separate from each other along with the rear side plate portions 54, maintaining the increased diameter of the cylindrical portion 24. Thereafter, as... Figure 8 As shown, the cam portion 101 reaches the through surface 134, thereby minimizing the thickness of the cam mechanism 82. In this state, the clamping of the inner post 22 based on the retaining cylinder portion 24 is released, and telescopic and tilting movements are permitted (this is the locked-out state).

[0103] like Figures 1-3 As shown, to change the extension / retraction position of steering wheel 2 forward, with the lock released, steering wheel 2 is pushed forward. Then, steering wheel 2, along with inner pillar 22 and steering shaft 12, moves forward relative to outer pillar 21. To change the extension / retraction position of steering wheel 2 rearward, with the lock released, steering wheel 2 is pulled out. Then, steering wheel 2, along with inner pillar 22 and steering shaft 12, moves rearward relative to outer pillar 21. Thus, the extension / retraction position of steering wheel 2 can be adjusted arbitrarily.

[0104] To change the tilt position of the steering wheel 2 upwards, with the lock released, the steering wheel 2 is pushed upwards. Then, the locking bolt 80 moves upwards within the tilt guide hole 56, causing the steering wheel 2, along with the column unit 11 and the steering shaft 12, to rotate upwards around the second axis O2.

[0105] To change the tilt position of the steering wheel 2 downwards, with the lock released, pull the steering wheel 2 downwards. Then, the locking bolt 80 moves downwards within the tilt guide hole 56, causing the steering wheel 2, along with the column unit 11 and the steering shaft 12, to rotate downwards around the second axis O2. This allows the tilt position of the steering wheel 2 to be adjusted to any desired position.

[0106] Here, as Figure 4 , Figure 10As shown, there is a gap S between the outer peripheral surface of the retaining portion 110 and the inner peripheral edge of the tilting guide hole 56, allowing the retaining portion 110 to move vertically within the tilting guide hole 56. Therefore, during the transition between the locked and unlocked states, frictional forces acting between the cam portion 101 and the cam follower portion 112 cause the retaining portion 110 to rotate circumferentially within the tilting guide hole 56. Specifically, when transitioning from the locked to the unlocked state, the retaining portion 110 rotates toward the other side of the bolt circumferential direction, causing the locking contacts 117 and 123 to separate from the inner peripheral edge of the tilting guide hole 56, and the releasing contacts 115 and 121 to approach or abut against the inner peripheral edge of the tilting guide hole 56. Therefore, when changing the tilting position, there is a possibility that the releasing contacts 115 and 121 may slide on the inner peripheral edge of the tilting guide hole 56.

[0107] like Figure 8 , Figure 9 As shown, when the cam portion 101 reaches the through surface 134, the operating lever 81 is sometimes pressed further down. In this case, the release position limiting surface 135 of the driven cam 91 is pressed into the other side of the bolt circumferential direction by the cam portion 101. As a result, the driven cam 91 will rotate towards the other side of the circumferential direction, thereby pressing the retaining portion 110 into the inner periphery of the tilting guide hole 56. Thus, the retaining portion 110 is pressed into the inner periphery of the tilting guide hole 56 via the release contact portions 115, 121.

[0108] In this embodiment, the radius of curvature of the release contacts 115 and 121 is larger than that of the locking contacts 117 and 123, but smaller than that of the tilting guide hole 56. Therefore, the pressure (surface pressure) acting between the release contacts 115 and 121 and the inner periphery of the tilting guide hole 56 is smaller than the surface pressure acting between the locking contacts 117 and 123 and the inner periphery of the tilting guide hole 56.

[0109] In this embodiment, the angle θ4 of the release position limiting surface 135 is larger than the angle θ2 of the retraction surface 101b. Therefore, when the operating lever 81 is further pressed down from the state where the cam portion 101 faces the through surface 134, the retraction surface 101b and the release position limiting surface 135 do not contact each other, and the ridge portion P of the cam portion 101 makes line contact with the release position limiting surface 135. Then, with the pressing operation of the operating lever 81, the ridge portion P of the cam portion 101 slides on the release position limiting surface 135. Thereafter, regarding the operating lever 81, at the moment when the cam portion 101 gradually rises on the release position limiting surface 135 until it is halfway up, rotation to the other side in the bolt circumferential direction is restricted. In the contact portion between the cam portion 101 (ridge portion P) and the release position limiting surface 135, the load acting in the normal direction of the release position limiting surface 135 is decomposed into a component along the bolt circumferential direction and a component along the left and right directions.

[0110] After adjusting the telescopic or tilting position, to re-lock the locking mechanism 61, the operating lever 81 is pulled up (rotating the operating lever 81 towards the bolt's circumferential direction). Then, a reverse action is performed to return it to the locked state. That is, with the rotation of the operating lever 81, the cam portion 101 moves relative to the driven cam 91 towards the bolt's circumferential direction. Then, after sliding on the release position limiting surface 135, the cam portion 101 passes through the passing surface 134 and the transition surface 133 to reach the mounting surface 131. Then, as the cam portion 101 slides on the transition surface 133 towards the bolt's circumferential direction, the drive base 100 slowly separates from the driven base 111. As a result, the thickness of the cam mechanism 82 gradually increases. Thus, the inner column 22 is clamped by the retaining cylinder portion 24, and the telescopic and tilting actions are restricted (locked state). Regarding the drive cam 90, at the moment when the engagement surface 101a of the cam portion 101 abuts against the locking position limiting surface 132, rotation of the driven cam 91 relative to the side in the bolt circumferential direction is restricted.

[0111] After the engaging surface 101a of the cam portion 101 abuts against the locking position limiting surface 132 in the bolt circumferential direction, the operating lever 81 is further pulled upward, thereby driving the cam 90 and the driven cam 91 to become one unit and rotate toward one side in the bolt circumferential direction. Then, in the locked state, the locking contacts 117 and 123 of the retaining portion 110 are pressed against the inner circumferential surface of the tilting guide hole 56, thereby restricting the rotation of the operating lever 81 around the third axis O3. At this time, the radius of curvature of the locking contacts 117 and 123 is smaller than the radius of curvature of the releasing contacts 115 and 121. Therefore, the surface pressure acting between the locking contacts 117 and 123 and the inner circumferential edge of the tilting guide hole 56 is greater than the surface pressure acting between the releasing contacts 115 and 121 and the inner circumferential edge of the tilting guide hole 56. Therefore, in the locked state, it can be ensured that the frictional force acting between the locking contacts 117, 123 and the inner periphery of the tilting guide hole 56 can suppress the unexpected up-and-down movement of the column unit 11.

[0112] Accordingly, in this embodiment, the retaining portion 110 in the driven cam 91, which is held in the tilting guide hole 56, has the following configuration: locking contact portions 117 and 123, which face the side in the bolt circumferential direction and, when in the locked state, contact the inner periphery of the tilting guide hole 56, thereby restricting the rotation of the driven cam 91 relative to the rear side plate portion 54 in the bolt circumferential direction; and releasing contact portions 115 and 121, which face the other side in the bolt circumferential direction and, when in the unlocked state, contact the inner periphery of the tilting guide hole 56, thereby restricting the rotation of the driven cam 91 relative to the rear side plate portion 54 in the bolt circumferential direction.

[0113] According to this configuration, during the process of the locking mechanism 61 changing from the locked state to the unlocked state, the retaining part 110 will rotate in response to the gap S between the inner periphery of the tilting guide hole 56 and the outer periphery of the retaining part 110. As a result, the retaining part 110 is pressed into the inner periphery of the tilting guide hole 56 via the release contact parts 115 and 121.

[0114] In this embodiment, the release contacts 115 and 121 are formed in an arc shape with a larger radius of curvature than the locking contacts 117 and 123. This allows the pressure (surface pressure) acting between the release contacts 115 and 121 and the inner periphery of the tilt guide hole 56 to be smaller than the surface pressure acting between the locking contacts 117 and 123 and the inner periphery of the tilt guide hole 56. As a result, it is possible to suppress the formation of indentations or the like on the inner periphery of the tilt guide hole 56. Therefore, even if the retaining part 110 slides on the inner periphery of the tilt guide hole 56 when changing the tilt position, the generation of abnormal noise or discomfort to the user can be reduced. Thus, a better operating feel can be provided to the user.

[0115] In the steering device 1 of this embodiment, the locking contacts 117 and 123 are configured to protrude toward the inner periphery of the tilting guide hole 56 relative to the release contacts 115 and 121.

[0116] According to this configuration, in the locked state, the locking contacts 117 and 123 can be reliably pushed against the inner periphery of the tilt guide hole 56. As a result, the steering device 1 of this embodiment can ensure the frictional force acting between the locking contacts 117 and 123 and the inner periphery of the tilt guide hole 56, and can suppress the unexpected up-and-down movement of the column unit 11.

[0117] Furthermore, by forming the release contact portions 115 and 121 in an arc shape, the steering device 1 of this embodiment can adjust the gap S between the outer peripheral surface of the retaining portion 110 and the inner peripheral edge of the tilting guide hole 56 by the protrusion amount of the locking contact portions 117 and 123. Therefore, loosening of the retaining portion 110 within the tilting guide hole 56 can be suppressed.

[0118] In the steering device 1 of this embodiment, there is a configuration in which a pair of locking contacts 117 and 123 are provided to sandwich the third axis O3 in the holding part 110, and a pair of releasing contacts 115 and 121 are provided to sandwich the third axis O3 in the holding part 110.

[0119] According to this configuration, the retaining portion 110 is pushed against the inner periphery of the tilting guide hole 56 at a diagonal position between which the third axis O3 is sandwiched. Therefore, the steering device 1 of this embodiment can stably hold the retaining portion 110 within the tilting guide hole 56 in both the locked and unlocked states, and can disperse the surface pressure acting between the retaining portion 110 and the inner periphery of the tilting guide hole 56. As a result, the formation of indentations or the like at the inner periphery of the tilting guide hole 56 can be more reliably suppressed.

[0120] In the steering device 1 of this embodiment, a display section 127 is provided on the outer peripheral surface of the driven base 111.

[0121] Based on this configuration, it is easy to ensure that the mounting orientation of the driven cam 91 is consistent among the steering devices 1. Therefore, the steering device 1 of this embodiment can suppress manufacturing deviations of the driven cam 91 that could cause deviations in the contact conditions between the retaining portion 110 (release contact portions 115, 121 and locking contact portions 117, 123) and the inner periphery of the tilt guide hole 56 among the steering devices 1. As a result, performance deviations of the locking mechanism 61 can be suppressed.

[0122] In the steering device 1 of this embodiment, a chamfered portion 128 is formed on the periphery of the driven base 111.

[0123] According to this configuration, even if the axis of the driven cam 91 is tilted relative to the third axis O3 due to factors such as the weight of the operating lever 81, the surface pressure acting between the periphery of the driven base 111 and the outer surface of the rear plate portion 54 can be reduced. Therefore, regarding the steering device 1 of this embodiment, even if the driven base 111 slides on the outer surface of the rear plate portion 54 when adjusting the tilt position, discomfort to the user can be reduced.

[0124] The preferred embodiments of this disclosure have been described above, but this disclosure is not limited to these embodiments. Additions, omissions, substitutions, and other modifications can be made to the configuration without departing from the spirit of this disclosure. This disclosure is not limited by the foregoing description, but only by the scope of the appended claims.

[0125] For example, in the above embodiment, the configuration in which the first axis O1 intersects with the longitudinal direction has been described, but it is not limited to this configuration. The first axis O1 may also be aligned with the longitudinal direction of the vehicle.

[0126] In the above embodiment, a configuration has been described in which a pair of release contacts 115, 121 and locking contacts 117, 123 are each provided at a diagonal position in the holding portion 110, sandwiching the third axis O3 between them, but the configuration is not limited to this. It is sufficient to have at least one release contact 115, 121 and locking contact 117, 123.

[0127] In the above embodiment, the configuration of changing from the unlocked state to the locked state by pulling up the operating lever 81 (the so-called pull-lock type) has been described, but a configuration of changing from the unlocked state to the locked state by pressing down the operating lever 81 (the so-called push-lock type) can also be used. In this case, on the same rotation limiting surface (e.g., the first rotation limiting surface 110c), the release contact portion (e.g., the first release contact portion 115) and the locking contact portion (e.g., the first locking contact portion 117) are arranged in positions opposite to those in the pull-lock type.

[0128] In the above embodiments, the configuration in which the cam portion (another component) 101 is a protruding shape and the cam follower portion (one component) 112 is a concave-convex surface that slides on the cam portion 101 has been described, but the configuration is not limited to this. That is, the cam follower portion (another component) 112 may also be a protruding shape and the cam portion (one component) 101 may be a concave-convex surface that slides on the cam follower portion 112.

[0129] The steering device 1 of the above-described embodiment has both a telescopic function and a tilting function, but it is sufficient to have at least a tilting function.

[0130] In the above embodiment, the cylindrical configuration of the column unit 11 has been described, but it is not limited to this configuration. Any configuration in which the column unit 11 can rotatably hold the steering shaft 12 is acceptable.

[0131] In the above embodiments, the case in which the movement restriction of the inner column 22 is restricted and released by expanding or shrinking the interval of the slit 28 has been described, but it is not limited to this configuration.

[0132] In the above embodiment, a configuration in which the cam portion 101 is in line contact with the release position limiting surface 135 and in surface contact with the locking position limiting surface 132 has been described, but the configuration is not limited to this. The cam portion 101 may also be configured to be in surface contact or line contact with both the locking position limiting surface 132 and the release position limiting surface 135.

[0133] Furthermore, without departing from the spirit of this disclosure, the constituent elements in the above embodiments can be appropriately replaced with well-known constituent elements, and the above variations can also be appropriately combined.

[0134] Symbol Explanation

[0135] 1: Steering mechanism

[0136] 11: Column Unit

[0137] 12: Steering shaft

[0138] 13: Front bracket

[0139] 14: Rear bracket

[0140] 54: Rear side panel (side panel)

[0141] 56: Tilt guide hole

[0142] 61: Locking mechanism

[0143] 80: Locking bolt (bar)

[0144] 90: Drive Cam

[0145] 91: Driven Cam

[0146] 101: Cam section (another component, a part)

[0147] 110: Maintaining Department

[0148] 111: Driven base (base section)

[0149] 112: Cam follower section (one component, another component)

[0150] 115: First release contact section (release contact section)

[0151] 117: First locking contact (locking contact part)

[0152] 121: Second release contact section (release contact section)

[0153] 123: Second locking contact (locking contact part)

[0154] 127: Display Section

[0155] 132: Lock position constraint surface

[0156] 135: Release position restriction surface

[0157] O1: First axis line

[0158] O2: Second axis

[0159] O3: Third axis.

Claims

1. A steering device comprising: A column unit that supports the steering shaft so that it can rotate about a first axis along the longitudinal direction; A front bracket is mounted on the vehicle body in a manner that supports the column unit so that it can rotate about a second axis in the left-right direction; The rear bracket has side plate portions located on both sides of the column unit in the left-right direction and having inclined guide holes extending in an arc shape with the second axis as the center, and is mounted on the vehicle body behind the front bracket; as well as A locking mechanism that switches between a locked state, restricting movement of the column unit relative to the front support about the second axis, and a unlocked state, allowing movement of the column unit relative to the front support about the second axis. The locking mechanism has the following features: The rod, which, in a state where it passes through the column unit and the inclined guide hole in the left-right direction, is rotatably supported by the column unit about a third axis in the left-right direction; A drive cam, having a cam portion, is fixed to the rod; as well as The driven cam has a retaining portion held inside the tilting guide hole and a cam follower portion facing the cam portion in the left-right direction outside the tilting guide hole and sliding on the cam portion as the rod rotates. One of the cam portion and the cam follower portion includes: A locking position limiting surface, which, when in the locked state, engages with another component in the cam portion and the cam follower portion; and The release position limiting surface, which is disposed away from the locking position limiting surface in the circumferential direction around the third axis, engages with the other component when in the locked-out state. The retaining part includes: A locking contact portion, which faces one side in the circumferential direction, and when in the locked state, contacts the inner periphery of the tilting guide hole, thereby restricting the rotation of the driven cam relative to the side plate portion about the third axis; and The release contact portion, which faces the opposite side in the circumferential direction, and when in the locked-out state, contacts the inner periphery of the tilting guide hole, thereby restricting the rotation of the driven cam relative to the side plate portion about the third axis. The release contact portion is formed in an arc shape with a larger radius of curvature than the locking contact portion. The retaining portion has a pair of locking contacts that sandwich the third axis between them. The retaining portion has a pair of release contact portions sandwiching the third axis between them.

2. The steering device of claim 1, wherein, The locking contact portion protrudes toward the inner periphery of the tilted guide hole relative to the releasing contact portion.

3. The steering device according to claim 1 or claim 2, wherein, The driven cam has a base portion located on the outer side relative to the tilting guide hole and having the cam follower portion formed therein. In the base portion, a display portion is provided in a portion of the circumferential direction for determining the mounting orientation of the retaining portion around the third axis.

Images