JP2000291789A - Shift lever bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a vibration prevention effect and operation feeling with respect to a shift lever bush provided with a cylindrical rubber elastic body for connecting inner/outer cylindrical body mutually. SOLUTION: In this shaft lever bush, a projection 4a projecting in a diameter direction is formed on the inner periphery surface of a rubber elastic body 4, while a recessed part 2c engaged with this projection 4a is formed on the outer periphery surface of an inner cylindrical body 2 and a pair of elastic body side insertion parts 4b, 4b which is a regular octagonal shape in the view from a cylinder shaft X direction are formed on the inner periphery surface of the rubber elastic body 4 on the cylinder shaft X direction both sides of the projection 4a. Further, this both elastic body side insertion parts 4b, 4b and a pair of inner cylinder body side insertion parts 2d, 2d inserting respectively so that the clearance of a prescribed amount is made in the diameter direction are formed on the outer periphery surface of the inner cylinder body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided between a shaft portion formed on one of a pair of shift lever members divided into two in an axial direction and a cylindrical portion formed on the other. It belongs to the technical field related to shift lever bush.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Utility Model Laid-Open No. 4-124452.
As shown in Japanese Patent Publication No. 0, a shaft portion formed on one (transmission side) of a pair of shift lever members divided into two in the axial direction (substantially coincident with the vertical direction) and the other (shift knob). It is known that a shift lever bush is provided between the shift lever bush and a cylindrical portion formed on the side of the transmission knob to prevent transmission of vibration on the transmission side from being transmitted to the shift knob side. Such a shift lever bush has an inner cylindrical body attached by external fitting to a shaft portion of one shift lever member, and a cylindrical shaft of the inner cylindrical body substantially surrounding the outer peripheral surface of the inner cylindrical body. An outer cylinder body that is coaxially arranged and attached to the cylindrical section of the other shift lever member by inner fitting, and is disposed between the inner cylinder body and the outer cylinder body, and connects the two cylinder bodies to each other; A cylindrical rubber elastic body.

According to the above publication, a stopper mechanism is provided between the inner cylinder and the outer cylinder to limit displacement between the inner cylinder and the outer cylinder in the radial, torsional, and axial directions. It has been proposed to improve the operability and the damping property against vibration.

[0004]

In the shift lever bush described above, the vibration direction of the shift lever member on the transmission side is mainly in the axial direction of the shift lever member (the cylinder axis direction of the inner cylinder). The demand for softening in the axial direction to increase the vibration damping effect and the twisting (rotation around the cylinder axis) and the twisting (rotation about the radial axis perpendicular to the cylinder axis) characteristics were initially softened, There is a demand to improve the operation feeling by setting the setting to be hard.

[0005] However, the above proposed example (Japanese Utility Model Laid-Open No. 4-1245)
No. 20), the displacement in the torsion direction between the inner cylinder and the outer cylinder is limited by a concave portion formed on one circumferential surface of an annular groove portion opened at the cylindrical axial end surface of the rubber elastic body. This torsion characteristic is soft at the beginning due to the above-mentioned predetermined interval, because the engagement is performed by the contact between the concave portion and the convex portion which can be engaged at a predetermined interval formed in the annular stopper member fitted in the groove. However, since the convex contact surface of the concave portion of the rubber elastic body is easily deformed in the circumferential direction, it cannot be so hardened after the contact due to this deformation.

In the above-mentioned proposal, the length of the rubber elastic body connecting the inner cylinder and the outer cylinder in the cylinder axis direction can be reduced to a certain extent by reducing the length in the cylinder axis direction. Since the rubber elastic body is fixed to the inner cylinder and the outer cylinder, a sufficient vibration-proof effect cannot be obtained.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to improve the anti-vibration effect and operation feeling of the above-mentioned shift lever bush by improving the structure thereof. An object of the present invention is to surely improve a ring.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a radially projecting convex portion is formed on an inner peripheral surface of a rubber elastic body, while an inner cylindrical body is formed. On the outer peripheral surface, a concave portion that engages with this convex portion is formed, and on the inner peripheral surface of the rubber elastic body on both sides in the cylinder axis direction of the convex portion, a pair of polygonal or elliptical shapes as viewed from the cylinder axis direction. A pair of inner cylinder-side fitting portions are formed so as to form an elastic body-side fitting portion and fit on the outer peripheral surface of the inner cylindrical body with the two elastic body-side fitting portions so as to have a predetermined amount of gap in the radial direction. Was formed.

More specifically, according to the present invention, a shaft is formed between a shaft formed on one of a pair of shift lever members divided into two in the axial direction and a cylindrical formed on the other. Target shift lever bush.

[0010] An inner cylinder attached to the shaft of the one shift lever member by external fitting, and substantially coaxial with the cylinder axis of the inner cylinder so as to surround the outer peripheral surface of the inner cylinder. An outer cylinder body disposed and attached to the cylindrical section of the other shift lever member by inner fitting; and a cylindrical rubber elastic body fixed to the inner peripheral surface of the outer cylinder body and connecting the two cylinder bodies to each other. A radially projecting convex portion is formed on the inner peripheral surface of the rubber elastic body over the entire circumference, while the outer peripheral surface of the inner cylindrical body has a tip of the convex portion. A concave portion is formed over the entire circumference to form a concave shape corresponding to the shape of the convex portion, and the concave portion to be engaged with the distal end portion of the convex portion is formed over the entire circumference. While a pair of elastic-body-side fitting portions having a polygonal shape or an elliptical shape as viewed from the cylinder axis direction are formed, On the outer peripheral surface of the inner cylinder body on both sides in the cylinder axis direction of the portion, a pair of inner cylinder body side fitting portions are respectively formed to fit with both elastic body side fitting portions so as to have a predetermined amount of gap in the radial direction. It is assumed that

According to the above configuration, the convex portion is formed to have a shape which is easily bent in the cylinder axis direction, so that the projection can be made extremely soft in the cylinder axis direction. Since the rubber elastic body is connected only by the engagement between the convex portion and the concave portion, the vibration on the transmission side is more shifted to the shift knob side than when the rubber elastic body is fixed to both the inner cylinder and the outer cylinder. Transmission can be made difficult, and the anti-vibration effect can be reliably improved. on the other hand,
When the shift lever member on the shift knob side receives an operation load by the shift operation or the select operation of the shift lever, the inner cylinder and the outer cylinder are relatively twisted around the cylinder axis or twisted around the radial axis. However, regarding the torsion characteristics at this time, since the elastic body side fitting portion and the inner cylinder body side fitting portion having a polygonal shape or an elliptical shape are fitted so as to have a predetermined amount of gap in the radial direction. Since it is twisted by an angle corresponding to the predetermined amount of clearance with almost no resistance, it is initially soft, and thereafter, the elastic body side fitting portion and the inner cylindrical body side fitting portion come into contact with each other and become hard. In addition, since the elastic body-side fitting portion of the rubber elastic body is unlikely to be deformed in the circumferential direction, it can be sufficiently hardened after the contact. In addition, the prying characteristic is soft at the beginning because the prying is performed with almost no resistance by the angle corresponding to the predetermined amount of the gap, and thereafter, the elastic body side fitting portion and the inner cylindrical body side fitting portion come into contact with each other and become hard. Therefore, the operation feeling can be reliably improved.

According to a second aspect of the present invention, in the first aspect of the present invention, the rubber elastic body is provided at a position facing both end surfaces in the axial direction of the rubber.
It is assumed that two restricting portions for restricting the inner cylinder and the rubber elastic body from moving relative to each other by a predetermined amount or more in the cylinder axis direction are provided.

Accordingly, even if the occupant pulls or pushes the shift lever member on the shift knob side in the axial direction, the end surface of the rubber elastic body in the cylinder axial direction abuts on the restricting portion and the inner cylinder and the rubber elastic body. Since the relative movement in the axial direction of the cylinder is restricted, the engagement between the convex portion of the inner peripheral surface of the rubber elastic body and the concave portion of the outer peripheral surface of the inner cylindrical body may be released or the convex portion may be broken. Absent. Therefore, reliability and durability can be improved while enhancing the vibration isolation effect.

According to a third aspect of the present invention, in the second aspect of the invention, the restricting portion is provided integrally with the outer peripheral surface of the inner cylinder. By doing so, it is possible to regulate the relative movement in the axial direction between the inner cylinder and the outer cylinder with a simple configuration without increasing the number of parts.

According to the fourth aspect of the present invention, there is provided the first, second or third aspect of the present invention.
In the invention, the inner cylinder body is fixed to the outer peripheral member formed with the inner cylinder body side fitting portion and the concave portion, the outer cylindrical member is fixed to the inner peripheral surface of the outer peripheral member, and is externally fitted to the shaft portion of the shift lever member. It is assumed that it is composed of two members, an inner peripheral side member to be combined. Thus, if the outer peripheral side member is, for example, a resin member, the concave portion and the inner cylindrical body side fitting portion can be easily formed, and the manufacturing cost can be reduced.

According to a fifth aspect of the present invention, in the first, second, third or fourth aspect, the gap between the elastic body side fitting portion and the inner cylindrical body side fitting portion is different in two directions orthogonal to each other in the radial direction. Is set as follows.

Thus, if the two directions orthogonal to each other are set, for example, as the shift direction and the select direction, which are the operation directions of the shift lever, the twisting characteristics in both directions can be made different from each other, so A suitable operation feeling can be realized.

According to a sixth aspect of the present invention, a shift provided between a shaft formed on one of a pair of shift lever members divided into two in the axial direction and a cylindrical portion formed on the other. For lever bush.

[0019] An inner cylinder attached to the shaft of the one shift lever member by external fitting, and substantially coaxial with the cylinder axis of the inner cylinder so as to surround the outer peripheral surface of the inner cylinder. An outer cylindrical body disposed and attached to the cylindrical part of the other shift lever member by inner fitting; and a cylindrical rubber elastic body fixed to an outer peripheral surface of the inner cylindrical body and connecting the two cylindrical bodies to each other. A radially protruding convex portion is formed on the outer peripheral surface of the rubber elastic body over the entire circumference, while a distal end portion of the convex portion is formed on the inner peripheral surface of the outer cylindrical body. A concave portion is formed over the entire circumference in a concave shape corresponding to the shape, and is engaged with the tip portion of the convex portion, and a cylindrical portion is formed on the outer peripheral surface of the rubber elastic body on both sides in the cylinder axial direction of the convex portion. While a pair of elastic body-side fitting portions having a polygonal shape or an elliptical shape as viewed from the axial direction are formed, On the inner peripheral surface of the outer cylinder body on both sides in the cylinder axis direction of the portion, a pair of outer cylinder body side fitting portions are fitted with the two elastic body side fitting portions so as to have a predetermined amount of gap in the radial direction. It shall be formed. According to the present invention, the same function and effect as those of the first aspect can be obtained.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a shift lever provided with a shift lever bush 1 according to an embodiment of the present invention. Reference numeral 11 denotes a lower shift of a pair of shift lever members divided into two in an axial direction (up and down direction). A lever member 12 is an upper shift lever member. A shaft section 1 having a circular cross section is provided on an upper portion of the lower shift lever member 11.
On the other hand, at the lower part of the upper shift lever member 12, a cylindrical tubular portion 12a surrounding the outer peripheral surface of the shaft portion 11a of the lower shift lever member 11 is formed. This shaft portion 11a is a small-diameter portion 1 forming an upper end portion.
1b and a large diameter portion 11c located below the small diameter portion 11b.
The small-diameter portion 11b is connected to the cylindrical portion 12a of the upper shift lever member 12 via the rubber member 13, while the large-diameter portion 11c is cylindrically connected via the shift lever bush 1. It is connected to the part 12a.
In addition, at the upper end of the upper side shift lever member 12,
A screw portion 12b to which a shift knob (not shown) is screwed is formed.

The shift lever bush 1 is, as shown in FIGS. 2 to 4, an inner cylindrical body which is attached and fixed to the large diameter portion 11b of the shaft portion 11a of the lower shift lever member 11 by external fitting. 2 is disposed substantially coaxially with the cylinder axis X (coincident with the shift lever members 11 and 12) of the inner cylinder 2 so as to surround the outer peripheral surface of the inner cylinder 2. A metal outer cylinder 3 is attached to and fixed to the cylindrical portion 12a by inner fitting, and a cylindrical rubber elastic body 4 connecting the cylinders 2 and 3 to each other. The inner cylinder 2 includes an outer peripheral member 2a made of resin and an inner peripheral member 2 disposed on the inner peripheral side of the outer peripheral member 2a and made of metal.
The inner peripheral side member 2b is externally fitted to the large diameter portion 11b of the shaft portion 11a. The inner peripheral surface of the outer peripheral member 2a and the inner peripheral member 2
The outer peripheral surface b has a circular shape when viewed from the cylinder axis X direction, and is fixed by insert molding or the like so as to be unable to rotate relative to each other about the cylinder axis X. Also, the inner peripheral member 2
b is set to be longer than the outer peripheral member 2a, and both ends of the inner peripheral member 2b in the cylinder axis X direction are respectively larger than the both end surfaces of the outer peripheral member 2a in the cylinder axis X direction. It protrudes in the X direction.

The inner peripheral surface of the outer cylindrical body 3 and the outer peripheral surface of the rubber elastic body 4 have a substantially regular octagonal shape as viewed from the cylinder axis X direction. It is fixed so that it cannot rotate.

At a substantially central portion of the inner peripheral surface of the rubber elastic body 4 in the cylinder axis X direction, a convex portion 4a protruding radially inward is formed over the entire circumference, and a distal end surface of the convex portion 4a is formed. Has a substantially regular octagonal shape when viewed from the cylinder axis X direction. This convex part 4
On the inner peripheral surface of the rubber elastic body 4 on both sides in the cylinder axis X direction a, a pair of elastic body side fitting portions 4b, 4b, which form a substantially regular octagonal shape (polygonal shape) as viewed from the cylinder axis X direction, are formed. ing. The thickness (radial direction) of each of the elastic body-side fitting portions 4b is set substantially uniformly over the entire circumference. A concave groove 4c that is concave in the radial direction is formed between each of the elastic body-side fitting portions 4b and the convex portion 4a, and the bottom surface of the concave groove 4c has a substantially regular octagonal shape when viewed from the cylinder axis X direction. The protrusion amount of the convex portion 4a from the bottom surface of the concave groove portion 4c is set to be substantially constant over the entire circumference. Further, the thickness (in the direction of the cylinder axis X) of the base end of the projection 4a is set smaller than that of the tip end, and the tip end of the projection 4a is
It is made easy to bend in the direction.

On the other hand, the outer peripheral surface of the outer peripheral member 2a of the inner cylinder 2 has a concave shape corresponding to the shape of the tip of the convex portion 4a of the inner peripheral surface of the rubber elastic body 4. A concave portion 2c that engages with the distal end portion 4a is formed over the entire circumference. That is, the bottom surface of the concave portion 2c has a substantially regular octagonal shape as viewed from the cylinder axis X direction such that the entire periphery of the tip end surface of the convex portion 4a substantially abuts, and the width of the concave portion 2c (the cylinder axis X direction). Is the convex part 4a
It is set to be substantially the same as the thickness of the tip. Recess 2c
Outer peripheral side member 2 of the inner cylindrical body 2 on both sides of the cylindrical axis X direction
A pair of inner fittings each fitted so that a predetermined amount (substantially constant over the entire circumference) of a gap is provided in the outer peripheral surface of the rubber elastic body 4 with both elastic body side fitting portions 4b, 4b in the radial direction. The cylindrical body-side fitting portions 2d are formed. That is, each of the inner cylindrical body-side fitting portions 2d is also similar to each of the elastic body-side fitting portions 4b,
It has a substantially regular octagonal shape when viewed from the cylinder axis X direction.

At both ends of the inner peripheral member 2b of the inner cylinder 2 in the cylinder axis X direction, the rubber elastic body 4 is restricted from moving in the cylinder axis X direction by a predetermined amount or more with respect to the inner cylinder 2. The two restricting portions 5 and 5 are integrally provided. That is,
The regulating portions 5 and 5 are formed integrally with the inner cylinder 2 by bending both ends of the inner peripheral member 2b of the inner cylinder 2 extending in the cylinder axis X direction in the radial direction, respectively. The outer peripheral edge of each regulating portion 5 is provided at a position facing both end surfaces of the rubber elastic body 4 in the cylinder axis X direction at a predetermined interval. The bending of at least one of both ends of the inner peripheral side member 2b in the cylinder axis X direction fixes the outer peripheral side member 2a and the inner peripheral side member 2b, and at the same time, the protrusion 4a of the rubber elastic body 4 and the outer peripheral side member 2a. The two elastic body-side fitting portions 4b,
4b and the inner cylinder body side fitting portions 2d, 2d, respectively. When the lower shift lever member 11 (inner cylinder 2) and the upper shift lever member 12 (outer cylinder 3) are relatively twisted, each of the restricting portions 5 is provided with the upper shift lever member 12. The inner surface of the cylindrical portion 12a is provided so as not to abut, and if the inner surface of the cylindrical portion 12a does not abut, each of the regulating portions 5 is extended radially outward to form the outer cylindrical body 3.
Alternatively, both ends of the rubber elastic body 4 in the cylinder axis X direction may be opposed to each other.

Therefore, in the above embodiment, when the shift lever is not operated, the inner cylindrical body 2 and the rubber elastic body 4 of the shift lever bush 1 have low rigidity and are easily bent in the cylinder axis X direction. And the recess 2c are connected by engagement with each other, so that the vibration of the shaft portion 11a of the lower shift lever member 11 (especially the vibration in the axial direction of the lower shift lever member 11 that is frequently generated) is reduced by the upper shift lever member. 12
Can be effectively prevented from being transmitted to the vehicle, and the anti-vibration effect can be greatly enhanced.

On the other hand, when the upper shift lever member 12 receives an operation load due to a shift operation or a select operation of the shift lever, the inner cylinder 2 and the outer cylinder 3 are relatively moved to the cylinder axis X.
Although it is twisted around or twisted around a radial axis passing substantially at the center of the projection 4a in the cylinder axis X direction, the torsion characteristics at this time have a substantially regular octagonal shape as viewed from the cylinder axis X direction. Since each elastic body side fitting portion 4b and each inner cylinder body side fitting portion 2d are fitted so as to have a predetermined amount of gap in the radial direction, the screw is screwed with little resistance by an angle corresponding to the predetermined amount of space. Therefore, the elastic body-side fitting portion 4b and the inner cylindrical body-side fitting portion 2d come into contact with each other, and then become hard.
Moreover, since each elastic body-side fitting portion 4b of the rubber elastic body 4 is hardly deformed in the circumferential direction, it can be made considerably hard after the contact. In addition, the prying characteristic is also soft at the beginning because it is hardly pryed by an angle corresponding to the predetermined amount of gap, and thereafter, the elastic body side fitting portion 4b and the inner cylinder body side fitting portion 2d come into contact with each other and become hard. Become. Then, by making the rubber of the rubber elastic body 4 harder, the elastic body-side fitting portion 4b and the inner cylinder body-side fitting portion 2 have both torsion characteristics and twisting characteristics.
After contact with d, it can be further hardened. On the other hand, even if the rubber is hardened as described above, the vibration isolation performance can be maintained at a high level by making the thickness of the projections 4a smaller. Therefore, both the anti-vibration effect and the operation feeling can be improved.

The cylinder axis X of the inner peripheral member 2b of the inner cylinder 2 is
At both ends in the direction, the rubber elastic body 4 has a cylindrical axis X with respect to the inner cylindrical body 2.
Since the two restricting portions 5 and 5 for restricting movement in the direction by a predetermined amount or more are provided integrally with each other, even if the occupant pulls or pushes the upper shift lever member 12 in the axial direction, the rubber elasticity is increased. The engagement between the convex portion 4a of the body 4 and the concave portion 2c of the outer peripheral member 2a of the inner cylindrical body 2 is not released or the convex portion 4a is not broken.

Further, since the inner cylinder 2 is composed of two members, that is, an outer peripheral member 2a made of resin and an inner peripheral member 2b made of metal, the concave portion 2c and each inner cylinder body fitting portion 2d are formed. Can be easily formed, and can be easily fixed by insert molding or the like so that they cannot rotate relative to each other about the cylinder axis X. In addition, since the inner peripheral member 2b is made of metal, the inner peripheral member 2b can be more securely attached and fixed to the large diameter portion 11b of the shaft portion 11a of the lower shift lever member 11 than the resin.

In the above embodiment, the elastic body side fitting portion 4 is used.
b and the inner cylinder body side fitting portion 2d are formed in a substantially regular octagonal shape when viewed from the cylinder axis X direction. However, any shape may be used as long as it is a polygonal shape. Is also good. In this case, the inner peripheral surface of the outer cylindrical body 3, the outer peripheral surface of the rubber elastic body 4, the front end surface of the convex portion 4 a of the rubber elastic body 4, and the inner cylindrical body 2
The bottom surface of the concave portion 2c of the outer peripheral side member 2a is
The shape may be a polygonal shape or an elliptical shape corresponding to b and the inner cylindrical body side fitting portion 2d.

Further, in the above-described embodiment, the inner cylindrical body 2 is composed of two members, the outer peripheral member 2a and the inner peripheral member 2b, but may be formed integrally with metal or resin. The outer cylinder 3 may be made of resin.

In the above-described embodiment, the two regulating parts 5, 5
Are integrally provided at both ends of the inner peripheral member 2b of the inner cylindrical member 2 in the direction of the cylinder axis X. However, as shown in FIG. 11 may be attached and fixed to the outer peripheral surface of the large diameter portion 11b of the shaft portion 11a. As shown in FIG. 11b. When the restricting portion 5 is formed of a snap ring or the like, the restricting portion 5 may be attached and fixed to the outer peripheral surface of the outer peripheral member 2a or the inner peripheral member 2b of the inner cylinder 2. Good.

Further, in the above-described embodiment, the gap between the elastic body side fitting portion 4b and the inner cylinder body side fitting portion 2d is set to be substantially constant over the entire circumference. However, as shown in FIG. May be set to be different in two directions orthogonal to each other. That is, the gap δa in the direction A in the drawing is set to be larger than the gap δb in the direction B perpendicular to the direction A. For example, if the direction A is set as the shift direction of the operation direction of the shift lever and the direction B is set as the select direction, the select direction can be hardened with a smaller amount of twist than the shift direction. Conversely, the direction A can be set to the select direction, and the direction B can be set to the shift direction, and can be adapted to the occupant's preference.

In addition, in the above embodiment, the rubber elastic body 4
The convex portion 4a and each elastic body side fitting portion 4b are formed on the inner peripheral surface of the inner cylindrical body, and the concave portion 2c and the inner cylindrical body side fitting portion 2d are formed on the outer peripheral surface of the outer peripheral member 2a of the inner cylindrical body 2. As shown in FIG.
A rubber elastic body 4 is fixed to the outer peripheral surface of the inner cylindrical body 2, and a convex portion 4 a protruding radially outward is formed at the center of the outer peripheral surface of the rubber elastic body 4 in the cylinder axis X direction. On the outer peripheral surface of the rubber elastic body 4 on both sides in the cylinder axis X direction of the cylinder 4a, a pair of elastic body side fitting portions 4b, 4b each having a polygonal shape or an elliptical shape as viewed from the cylinder axis X direction are formed. A concave portion 3a is formed on the inner peripheral surface of the concave portion 3 so as to correspond to the distal end portion of the convex portion 4a and engages with the distal end portion of the convex portion, and both sides of the concave portion 3a in the cylinder axis X direction. A pair of outer cylinder body side fitting portions 3b, 3b are fitted on the inner peripheral surface of the outer cylinder body 3 so that there is a predetermined amount of gap in the radial direction with the two elastic body side fitting portions 4b, 4b. It may be formed. In this case, the portion of the outer peripheral surface of the inner cylindrical body 2 to which the rubber elastic body 4 is fixed, the inner peripheral surface of the rubber elastic body 4, the tip end of the convex portion 4 a of the rubber elastic body 4, and the bottom surface of the concave portion 3 a of the outer cylindrical body 3 are: The shape may be a polygonal shape or an elliptical shape corresponding to the elastic body side fitting portion 4b and the outer cylinder body side fitting portion 3b.

[0035]

As described above, according to the shift lever bush of the present invention, while the radially projecting convex portion is formed on the inner peripheral surface of the rubber elastic body, the convex portion is formed on the outer peripheral surface of the inner cylindrical body. A pair of elastic body-side fitting portions that form a polygonal or elliptical shape as viewed from the cylinder axis direction are formed on the inner peripheral surface of the rubber elastic body on both sides in the cylinder axis direction of the projections. By forming a pair of inner cylinder body side fitting portions that are fitted on the outer peripheral surface of the inner cylinder body so that there is a predetermined amount of gap in the radial direction with both elastic body side fitting portions, It can be softened in the cylinder axis direction to increase the vibration isolation effect,
The operation feeling can be improved by setting the torsion characteristics and the prying characteristics to be soft initially and then hard.

In addition, a convex portion projecting in the radial direction is formed on the outer peripheral surface of the rubber elastic body, and a concave portion engaging with the convex portion is formed on the inner peripheral surface of the outer cylindrical body. On the outer peripheral surface of the rubber elastic body on both sides in the cylinder axis direction, a pair of elastic body side fitting portions forming a polygonal shape or an elliptical shape as viewed from the cylinder axis direction is formed, and on the inner peripheral surface of the outer cylinder body, By forming a pair of outer cylinder body side fitting portions that fit each other so that a predetermined amount of gap is provided in the elastic body side fitting portion and the radial direction, in the same manner as described above, both the vibration isolation effect and the operation feeling are achieved. Can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a part of a shift lever provided with a shift lever bush according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a portion of the shift lever of FIG. 1 where a shift lever bush is provided.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a diagram corresponding to FIG. 2, showing a modification of the regulating unit.

FIG. 6 is a diagram corresponding to FIG. 2, showing still another modified example of the regulating unit.

FIG. 7 shows a gap between an elastic body side fitting portion and an inner cylindrical body side fitting portion.
FIG. 5 is a diagram corresponding to FIG. 4, showing a modified example in which two different directions are orthogonal to each other in a radial direction.

FIG. 8 is a view corresponding to FIG. 2, showing another embodiment of the shift lever bush.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shift lever bush 2 Inner cylinder 2a Outer side member 2b Inner side member 2c Depression 2d Inner cylinder side fitting part 3 Outer cylinder 3a Depression 3b Outer cylinder side fitting part 4 Rubber elastic body 4a Convex part 4b Elastic body side fitting Joint part 5 Restriction part 11 Lower shift lever member 11a Shaft part 12 Upper shift lever member 12a Cylindrical part

Claims (6)

[Claims] 1. A shift lever bush provided between a shaft portion formed on one of a pair of shift lever members divided into two in an axial direction and a cylindrical portion formed on the other. An inner cylindrical body attached by external fitting to a shaft portion of the one shift lever member, and disposed substantially coaxially with a cylindrical axis of the inner cylindrical body so as to surround an outer peripheral surface of the inner cylindrical body; An outer cylindrical body attached to the cylindrical portion of the shift lever member by inner fitting; and a cylindrical rubber elastic body fixed to an inner peripheral surface of the outer cylindrical body and connecting the two cylindrical bodies to each other. On the inner peripheral surface of the rubber elastic body, a convex portion projecting in the radial direction is formed over the entire circumference, while on the outer peripheral surface of the inner cylindrical body, a shape corresponding to the tip end shape of the convex portion is provided. A concave portion is formed over the entire periphery so as to engage with the convex portion tip portion so as to form a concave shape. On the inner peripheral surface of the rubber elastic body on both sides in the cylinder axis direction of the convex portion, a pair of elastic body side fitting portions having a polygonal shape or an elliptical shape as viewed from the cylinder axis direction is formed, while the concave portion cylinder On the outer peripheral surface of the inner cylindrical body on both axial sides, a pair of inner cylindrical body-side fitting portions are formed to fit with both elastic body-side fitting portions so as to have a predetermined amount of gap in the radial direction. A shift lever bush, characterized in that: 2. The shift lever bush according to claim 1, wherein the inner cylinder and the rubber elastic body are at least a predetermined amount in the cylinder axis direction at positions opposed to both ends of the rubber elastic body in the cylinder axis direction. A shift lever bush, wherein two restricting portions for restricting movement are provided. 3. The shift lever bush according to claim 2, wherein the restricting portion is provided integrally on the outer peripheral surface of the inner cylinder. 4. The shift lever bush according to claim 1, 2 or 3, wherein the inner cylinder has an outer peripheral member formed with an inner cylinder-side fitting portion and a recess, and an inner peripheral surface of the outer peripheral member. And an inner peripheral side member which is fixed to the shaft and which is externally fitted to the shaft portion of the shift lever member.
A shift lever bush comprising a member. 5. The shift lever bush according to claim 1, wherein a gap between the elastic body side fitting portion and the inner cylinder body side fitting portion is different in two directions orthogonal to each other in the radial direction. A shift lever bush characterized by being set. 6. A shift lever bush provided between a shaft portion formed on one of a pair of shift lever members divided into two in the axial direction and a cylindrical portion formed on the other. An inner cylindrical body attached by external fitting to a shaft portion of the one shift lever member, and disposed substantially coaxially with a cylindrical axis of the inner cylindrical body so as to surround an outer peripheral surface of the inner cylindrical body; An outer cylindrical body attached to the cylindrical portion of the shift lever member by inner fitting, and a cylindrical rubber elastic body fixed to the outer peripheral surface of the inner cylindrical body and connecting the two cylindrical bodies to each other, On the outer peripheral surface of the rubber elastic body, a convex portion projecting in the radial direction is formed over the entire circumference, while on the inner peripheral surface of the outer cylindrical body, the shape corresponds to the tip end shape of the convex portion. A concave portion is formed over the entire circumference so as to be concave and engage with the tip of the convex portion. On the outer peripheral surface of the rubber elastic body on both sides in the cylinder axis direction of the convex portion, a pair of elastic body side fitting portions having a polygonal shape or an elliptical shape as viewed from the cylinder axis direction is formed, while the cylindrical shaft of the concave portion is formed. On the inner peripheral surface of the outer cylindrical body on both sides in the direction, a pair of outer cylindrical body-side fitting portions are formed to be fitted to the two elastic body-side fitting portions so as to have a predetermined amount of gap in the radial direction. A shift lever bush, characterized in that: