JP2603994Y2 - Anti-vibration bush - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vibration coupling device which is interposed between an operating side and an operated side which perform operations including relative rotation, such as a connecting portion between a shift lever and an arm on a transmission side. It relates to an anti-vibration bush to be insulated.

[0002]

2. Description of the Related Art As this kind of vibration isolating bush, for example, there is one that is interposed between a shift lever of a transmission of an automobile and an arm operated by the shift lever. FIG. 4 schematically shows a manual operation unit of the manual transmission, and shows a shift lever 1.
The large spherical portion 1a is rotatably supported on the spherical inner surface of the socket 3 provided in the housing 2 on the vehicle body side.
A small ball portion 1b formed at the working end of the shift lever 1
Further, an end of a transmission-side arm 4 (not shown) is connected via a spherical bush 5 and an anti-vibration bush 6. The anti-vibration bush 6 is typically an inner sleeve 6 a fixed to the outer periphery of the spherical bush 5.
An outer sleeve 6b which is fixed to the fitting portion 4a of the arm 4 on the outer periphery thereof, and both sleeves 6a, 6b
An elastomer member 6c is interposed therebetween, and is mounted in order to minimize transmission of an impact due to vibration or the like from a gear of the transmission from the arm 4 to the shift lever 1 side.

[0003]

As shown in FIG. 5, the vibration isolating bush 6 having the above-mentioned conventional structure shows the relationship between the load F and the displacement δ at the time of the initial displacement of the shift lever 1, that is, the initial compression state of the elastomer member 6c. , The spring constant (F /
δ) is low, and the spring constant increases with the displacement of the shift lever 1. For this reason,
At the position δ ₁ where the operation of the arm 4 by the operation of the shift lever 1 is completed and the vibration impact from the gear is input, the spring constant of the elastomer member 6 c increases, and the transmission of the impact to the shift lever 1 is effective. Can not be reduced. To reduce the transmission of such an impact, it is effective to set the spring constant of the elastomer member 6c low. However, the anti-vibration bush 6 efficiently transmits the operating force of the shift lever 1 to the transmission side. must intended to, therefore, simply when the gradual rising of load F with respect to the displacement [delta] with a lower spring constant, the displacement for obtaining a load F ₁ required to complete the operation of the arm 4 [delta] ₁ becomes large, so that the operability of the shift lever 1 is deteriorated.

The present invention has been made under the above circumstances, and the technical problem thereof is to improve insulation against vibration and shock without deteriorating the transmission of the initial operating force. It is in.

[0005]

Means for Solving the Problems The technical problems described above are:
The present invention can solve the problem effectively. That is, the anti-vibration bush according to the present invention includes an inner sleeve fixed to one member of a connecting portion between two members that perform an operation including relative rotation, and an inner sleeve that is disposed on an outer periphery of the inner sleeve. An outer sleeve fixed to the other member, an elastomer member connecting the two sleeves in a direction intersecting with the load input direction, and a tip extending substantially from the inner sleeve in a manner substantially corresponding to the load input direction. A cam stopper which is closely opposed to the inner periphery of the outer sleeve, and which is in an initial rotational displacement state of the two sleeves.
In this case, the tip of the cam stopper is
Contact the inner circumference of the sleeve, and the rotational displacement of the two sleeves proceeds.
The tip of the cam stopper is
The characteristic is that it is deviated from the inner circumference of the probe .

[0006]

[Function] Since the elastomer member connecting the inner sleeve and the outer sleeve is interposed in a direction intersecting the load input direction, the elastomer member is mainly subjected to deformation in the shearing direction, and therefore the spring constant is reduced. It is set low. The inner sleeve and outer sleeve are
Since one is fixed to the swinging side and the other is fixed to the reciprocating side, the operation is performed with relative rotation about a line orthogonal to the axial direction and the load input direction. And
In the initial displacement state in this operation, the leading end of the cam stopper comes into contact with the inner peripheral surface of the outer sleeve, so that the rise of the load becomes large, and as the operation proceeds from this initial displacement state, the cam stopper Is rotated relative to the outer sleeve together with the inner sleeve, so that the contact state with the outer sleeve is released, and between the inner sleeve and the outer sleeve,
The connection is established only by the elastomer member whose spring constant is set low.

[0007]

FIG. 1 shows a preferred embodiment in which the present invention is applied to an anti-vibration bush interposed between a shift lever of a transmission and an arm operated by the shift lever. An inner sleeve 12 fixed to the working end of the shift lever in a non-rotational state is the inner sleeve 1.
An outer sleeve 13, which is arranged on the outer periphery of the outer sleeve 1 and fixed to the arm, is vulcanized and bonded between the inner sleeve 11 and the outer sleeve 12, and is substantially orthogonal to the input direction of the load F from the shift lever. It is an elastomer member interposed in the direction in which Inner sleeve 1
1, a pair of highly rigid cam stoppers 14, which are 180 ° symmetrical positions and extend substantially corresponding to the input direction of the load F, are fixed via a part of the elastomer member 13. . Each of the cam stoppers 14 has a rounded tip 14 a which is close to and opposed to the inner peripheral surface of the outer sleeve 12.

The anti-vibration bush is moved on a spherical surface centered on a large spherical portion (see reference numeral 1a in FIG. 4) by operating a shift lever. For this reason, the inner sleeve 11 fixed in a non-rotational state with respect to the working end of the shift lever rotates the outer sleeve 12 fixed to the arm side around the axis parallel to the line CC. Are coupled. When the shift lever is at the origin position where the shift lever is in the upright state, the inner sleeve 11 and the outer sleeve 12 have a substantially concentric positional relationship as shown in FIG.

FIG. 2 shows a cam stopper 14 associated with the relative displacement between the inner sleeve 11 and the outer sleeve 12 when receiving the operating force from the shift lever in the above embodiment.
FIG. 3 shows the relationship between the load F and the displacement δ at this time. That is, when the shift lever is operated from the origin position, at the time of the initial displacement, as shown in FIG. 2A, one cam stopper 14 comes into contact with the inner peripheral surface of the outer sleeve 12, and in this state, the shift lever From the transmission to the transmission. Therefore, the operability and operational feeling of the shift lever are significantly improved.

As described above, with the movement of the vibration isolating bush by operating the shift lever, the inner sleeve 11 rotates with respect to the outer sleeve 12, and the cam stopper 14 also rotates integrally. The inner sleeve 11 receiving the operating force of the shift lever
Is rotated by the rotation of the cam stopper 14 as described above.
It is eccentric with respect to the outer sleeve 12 while deforming the elastomer member 13. For this reason, when it is further displaced from the initial displacement state of FIG. 2A, the supporting force due to the elasticity of the elastomer member 13 against deformation increases,
Further, since the tip 14 a of the cam stopper 14 is formed in a round shape, the tip 1 a of the cam stopper 14 is gradually increased due to an increase in the inclination angle of the cam stopper 14 with respect to the inner peripheral surface of the outer sleeve 12.
4a is separated from the inner peripheral surface of the outer sleeve 12. For this reason, the inner sleeve 11 and the outer sleeve 12
As shown in FIG. 2B, contact through the cam stopper 14 is released, that is, gaps G ₁ and G ₂ are generated between the inner peripheral surface of the outer sleeve 12 and the tip 14 a of the cam stopper 14. Thus, the two sleeves 11 and 12 are connected by only the elastomer member 13. Moreover, since the elastomer member 13 extends in a direction substantially perpendicular to the input direction of the load F, the operation of the shift lever is thereafter completed, and the vibration impact from the gear of the transmission is applied to the outer sleeve via the arm. 12
At the position δ ₁ (see FIG. 3) inputted to the shift lever, the transmission of the vibration impact to the shift lever can be effectively reduced.

In the illustrated embodiment, the vibration isolating bush is interposed between the shift lever of the transmission and the arm operated by the shift lever. The present invention can be applied to other anti-vibration bushes that are interposed. Further, the shapes of the cam stopper 14, the elastomer member 12, and other details are not particularly limited to those illustrated.

[0012]

As is clear from the above description, according to the present invention, despite the lower spring constant of the elastomer member, the outer sleeve and the outer sleeve are not affected by the initial displacement when the operating force is input. Since the operating force is transmitted well by the contact of the cam stopper, operability and operability can be improved, and at the vibration shock input position, the engagement state of the outer sleeve and the stopper is released, and the inner sleeve and the outer sleeve are released. The connection between the sleeves is made only by the elastomer member, so that the spring constant is reduced, and the transmission of vibration and impact can be effectively reduced.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a vibration-isolating bush according to the present invention, wherein (A) is a cross-sectional view cut along a plane perpendicular to an axis;
(B) is a sectional view taken along line BB in (A),
(C) is a sectional view taken along line CC in (A).

FIGS. 2A and 2B are illustrations showing the operation of the above embodiment, in which FIG. 2A shows an initial displacement state, and FIG. 2B shows a state further displaced from FIG.

FIG. 3 is a graph of a spring characteristic showing a relationship between a load and a displacement in the embodiment.

FIG. 4 is an explanatory view schematically showing an operation unit of a manual transmission equipped with a vibration-proof bush having a conventional structure.

FIG. 5 is a graph of a spring characteristic showing a relationship between a load and a displacement in a conventional vibration-isolating bush.

[Explanation of symbols]

 11 inner sleeve 12 outer sleeve 13 elastomer member 14 cam stopper 14a tip

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16F 15/02-15/08 B60K 20/02 G05G 1/00-25/02

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner sleeve (11) fixed to one member of a connecting portion between two members performing an operation including relative rotation, and the connecting portion disposed on an outer periphery of the inner sleeve (11). Outer sleeve (1) fixed to the other member of
2) and an elastomer member (1) connecting the two sleeves (11) and (12) in a direction intersecting the direction of input of the load (F).
3) a cam stopper (14) extending from the inner sleeve (11) substantially corresponding to the input direction of the load (F) and having a tip (14a) closely opposed to the inner periphery of the outer sleeve (12). And the two sleeves (11) and (12) are in the initial rotational displacement state.
The tip (14a) of the cam stopper (14)
The outer sleeve (12) contacts the inner periphery of the
When the rotational displacement of the sleeves (11) and (12) progresses
The tip (14a) of the cam stopper (14) is
An anti-vibration bush , which comes off the inner periphery of the outer sleeve (12) .