JPH0744812Y2 - Damper bush for push-pull control cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a damper bush for a push-pull control cable. More specifically, a push-pull control used for connecting a transmission and an operating lever of an automobile relates to a damper bush attached to an eye end fixed to an end of a cable.

[Prior Art] A push-pull control cable has been conventionally used as an operation force transmission means between a transmission and an operation lever of an automobile. Such a push-pull control cable does not transmit engine vibration to the operating lever,
Further, in order to improve the operation feeling, a damper bush having a rubber-like elastic body on the outer circumference of a bush core has been conventionally used by being attached to the eye end at the end of the control cable. The damper bush shown in FIG. 12 is
An elastic ring (52) made of rubber or the like is integrally baked on the outer circumference of a cylindrical hard bush core (51), and is used by being fitted into the hole (54) of the eye end (53). . A control cable equipped with such a damper bush is connected to a mating member (57) such as an operating lever or a shift fork by a pin (56) that is rotatably inserted into a hole (55) in the bush core (51). To be done. As a result, the vibration transmitted to the control cable is blocked, and along with the transmission of force with the mating member (57), the elastic ring (52) absorbs the shock at the time of gear change, and the relative movement of the lever and control cable. Absorb changes in angle.

By the way, the spring constant (elasticity coefficient) of the damper bush
If is too small, the stroke will be greatly absorbed by the elastic force in the direction of force transmission, so there will be a "gunya" at the start of the shift lever operation, or a "moderation feeling" when the operation is completed. There is a problem that the operation feeling is impaired, such as not being able to feel.

On the other hand, it is better to reduce the elastic coefficient in order to reduce the "two-step feeling (two resistances when the gear enters in the middle of the operation stroke)" and "rigid feeling" and to prevent vibration transmission. However, if so, the operation feeling is impaired as described above, and if the elastic coefficient is increased, the effect of preventing vibration transmission is reduced.

Therefore, in the structure shown in FIG. 12, a space (S) is provided between the elastic ring (52) and the inner wall of the eye end (53) in the direction in which the control cable extends, and, for example, the 14th
As shown in (Y) of the figure, the elastic coefficient is kept small in a range where the displacement is small, and when the space is crushed, the elastic ring (5
2) and the eye end (53) are in direct contact with each other to increase the elastic coefficient, which is a technique of changing the elastic coefficient according to the amount of bending.

However, this also cannot change the elastic coefficient so much and does not satisfy both the vibration transmission prevention and the operation feeling.

On the other hand, as shown in Fig. 13, the collar (62) having a diameter slightly smaller than the inner diameter of the eye end (63) is attached to the eye end (63).
By installing inside, eye end (63) and pin (64)
It has also been proposed to regulate the maximum value of the relative angle between and to limit the maximum strain of the rubber damper bush (61) to protect it (Japanese Utility Model Laid-Open No. 57-182628).

However, this is not different from the conventional one in terms of preventing vibration transmission, and the spring constant is not so small in the range of small displacement. Moreover, in this case, the volume of the elastic body is reduced by the collar portion, and the amount of vibration absorption is reduced.

[Problems to be solved by the device]

In the conventional rubber damper bush, if the hardness of the rubber is lowered to reduce the inclination of the initial deflection-load curve, the inclination of the latter half does not rise significantly (see (X) in FIG. 14).
Conversely, if you try to raise the hardness of the rubber to raise the slope in the latter half, the slope in the initial stage will also increase (see (Y) in Fig. 14).
Therefore, there is a problem that a good feeling cannot be obtained in the entire operation stroke.

The present invention has been made in order to solve the above-mentioned problems, and it has an excellent effect of preventing vibration transmission, and there is no "two-step feeling", "rough feeling" or "gunya feeling", and smooth " It is an object of the present invention to provide a damper bush (typically having characteristics as shown in (Z) of FIG. 14) that gives a “moderate feeling”.

[Means for Solving the Problems]

The damper bush of the present invention is inserted into the eye end fixed to the end of the push-pull control cable. (A) The cylindrical portion and the outer circumference of the cylindrical portion are in a plane perpendicular to the axis of the cylindrical portion. And a bush core having rigidity formed of an oval-shaped collar portion, and (b) a substantially cylindrical rubber-like elastic ring formed concentrically on the outside of the bush core. (C) When the major axis direction of the collar portion is installed in the eye end along the axial direction of the push-pull control cable, the portions of the outer periphery of the elastic ring corresponding to both ends of the major axis of the collar portion are Each is characterized by being concave so that a space is provided between it and the inner circumference of the eye end.

Further, the diameter of the concave portion of the elastic ring is larger than the major axis of the collar portion, and the elastic body covers both ends of the diameter of the collar portion, or the diameter of the concave portion is the major axis. Equally, the collar portion may be exposed.

[Action]

The damper bush of the present invention is attached to the eye end of the control cable so that the long diameter of the oval collar portion is oriented in the direction of the lever operating force. Then, since the damper bush is supported by the eye end on the long side of the collar portion via the elastic body, the effect of the space between the portions corresponding to both ends of the major diameter and the inner diameter of the eye end causes the damper bush to move. The direction in which the control cable extends is the shearing direction of the elastic body, and the spring constant is low. Moreover, the volume of the elastic body can be secured,
There is a large amount of vibration absorption. Therefore, the vibration transmission to the control cable is sufficiently damped by the elastic body. Therefore, in the initial stage of operation, it begins to stroke smoothly, and immediately one end of the oblong collar in the major axis direction passes through the peripheral wall of the elastic ring,
Alternatively, since the flange portion directly contacts the inner diameter portion of the eye end to transmit the force, there is no uncomfortable feeling and a preferable moderation feeling is generated.

〔Example〕

Next, the damper bush of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the damper bush of the present invention, FIG. 2 is a perspective view showing a bush core constituting the damper bush of FIG. 1, and FIG. II
(I)-(III) line sectional view, FIG. 4 is (IV)-(I of FIG.
V) line sectional view, FIG. 5 is a sectional view showing the dimensions and shape of the damper bush of Example 2, and FIGS. 6 to 10 are Comparative Example 1 respectively.
Sectional views showing the dimensions and shapes of the damper bushes Nos. 5 to 11,
The figure is a graph showing the test results of Examples and Comparative Examples.

In FIG. 1, (1) is a damper bush, and the damper bush (1) is composed of an elastic body (2) and a bush core (3) concentrically provided in the elastic body (2). ing.

As shown in FIG. 2, the bush core (3) includes a cylindrical portion (5) having a through hole (4) in the axial direction, and an oval collar portion (6) formed substantially at the center of the outer periphery thereof. Is integrally formed from a rigid material such as metal. Further, at both ends of the hole (4), tapered surfaces (4a) are formed which serve as guides when the hinge pin is inserted.

The rubber elastic body (2) mounted on the outside of the bush core (3) has a substantially cylindrical central portion (7).
Is a thin disk part (8a) integrally formed on both ends,
It has a sandwich shape sandwiched by (8b).
Recesses (9a) and (9b) are formed on the outer periphery of the central portion (7) corresponding to both ends of the major diameter of the collar portion (6) (FIGS. 1 and 3). reference). When the damper bush is fitted into the eye end (10) of the control cable, these recesses (9a) and (9b) form a space (11) between the recess and the inner diameter portion of the eye end (10) ( (See FIG. 4).

Further, the elastic body (2) is formed integrally with the bush core (3) by arranging and molding unvulcanized rubber outside the bush core (3) and then vulcanizing the elastic body (2) as in the conventional one. (See FIGS. 1, 3, and 4).

Next, the operation of the damper bush of this embodiment will be described.

Insert the damper bush (1) into the eye end (1) so that the long diameter direction of the oval collar follows the axial direction of the control cable.
0). The two discs (8) of the elastic body (2)
The eye end (10) is fitted between a) and (8b) (see FIG. 4). The outer diameter of the central portion (7) of the elastic body (2) is smaller than the inner diameter of the eye end (10) and the disc portion (8).
The distance between a) and (8b) is slightly smaller than the thickness of the eye end, so there is no rattling after mating.

When a gear shifting operation is performed via the damper bush (1) of the present embodiment incorporated as described above, the impact at the time of gear engagement is absorbed by the space (11), and at the beginning of the operation the space ( Since 11) is crushed, it is possible to make a stroke with a small operating force, and the required operating force increases from the middle of the operation, which is a very preferable feeling of moderation.

A rubber material can be used as the material of the elastic ring, and CR (chloroprene rubber) is particularly preferable. Regarding rubber hardness, Hs40 to Hs80 can be used, but Hs50 to Hs65 is particularly preferable.

As a material of the bush core (3), a rigid material such as aluminum or copper alloy is used.

In the present embodiment, the space (11) between the eye end and the damper bush is created by forming the recesses (9a) and (9b) on the outer circumference of the elastic ring, and the long diameter of the flange (6). As shown in FIG. 3, both ends are covered with the elastic body (2). However, in another embodiment shown in FIG.
The part is shaped so that both ends of the long diameter of the collar part (36) are completely exposed.

In such a case where both ends of the collar portion (36) are exposed, the inclination of the flexure-load curve in the latter half of the operation becomes larger than that in the case where the flange portion (36) is covered with the elastic body (2). On the other hand, when both ends of the collar portion (6) are covered, generally, the thicker that portion is, the smaller the inclination of the deflection-load curve in the latter half is. Therefore, it is possible to adjust the inclination by changing the thickness.

Next, the effects of the damper bush of the present invention will be described with reference to specific examples and comparative examples.

Example 1 As Example 1, a damper bush as shown in FIGS. 3 and 4 was manufactured. The bush core has a collar with a major axis (Da1) of 25 mm, a minor axis (Da2) of 17 mm, an elastic body outer diameter (Da3) of 30.8 mm, and an elastic body recessed outer diameter (Da4) of 2.
8.2mm, the inner diameter of the eye end (Da5) is 30mm. The material of the elastic body is CR, and the hardness is Hs50.

Example 2 As Example 2, a damper bush as shown in FIG. 5 was manufactured. This is the same as Example 1 with the major diameter Db4 of the collar portion being 28.2 mm.
It is different in that. That is, both end sides of the long diameter of the collar portion are exposed in the concave portion, but the others are the same as those in the first embodiment.

Comparative Example 1 A damper bush of model A330600 manufactured by Tokai Rubber Industries, Ltd. was used as Comparative Example 1.

The specifications of the same parts as in the first embodiment are as follows with reference to FIG.

Bush core diameter (Dc1) is 14 mm, elastic body outer diameter (Dc1)
2) is 23 mm, the outer diameter (Dc3) of the recess of the elastic body is 20.6 mm, and the inner diameter (Dc4) of the eye end is 22 mm. The material of the bush core is copper alloy, and the hardness is Hs65 as an elastic body.
CR was used. The shape has the recess as shown in FIG. 6, but the bush core does not have the flange.

Comparative Example 2 A damper bush of model A29990A manufactured by Nippon Cable System Co., Ltd. was used as Comparative Example 2. As shown in FIG. 7, the shape of this product is such that the elastic body has no recess and the bush core has no flange. Bush core diameter (Dd
1) is 12 mm, elastic body outer diameter (Dd2) is 22 mm, eye end inner diameter (Dd3) is 22 mm, bush core material is copper alloy, elastic material is CR and hardness is Hs70.

Comparative Example 3 A damper bush of model A24590E manufactured by Nippon Cable System Co., Ltd. was used as Comparative Example 3. As shown in FIG. 8, the shape of this product is such that the elastic body has no recess and the bush core has no flange. Bush core collar diameter (De1) is 12m
m, outer diameter of elastic body (De2) is 22 mm, inner diameter of eye end (De
3) is 22 mm, the material of the bush core is copper alloy, the material of the elastic body is CR, and the hardness is Hs80.

Comparative Example 4 A damper bush of model A30330D manufactured by Nippon Cable System Co., Ltd. was used as Comparative Example 4. As shown in FIG. 9, the shape of this product is such that the elastic body has no recess and the bush core does not have a flange. The diameter (Df1) of the flange of the bush core is 11 mm and the outer diameter (Df2) of the elastic body is 22mm, inner diameter of eye end (Df3) is 22mm, material of bush core is copper alloy, material of elastic body is CR and hardness is Hs60.

Comparative Example 5 A damper bush of model E00360H manufactured by Nippon Cable System Co., Ltd. was used as Comparative Example 5. As shown in Fig. 10, the shape of this product is such that the elastic body has no recess, and the bush core has no flange. The diameter of the bush core flange (Dg1) is 13 mm, and the elastic body outer diameter (Dg2) is 34 mm. The inner diameter (Dg3) of the eye end is 34 mm, the material of the bush core is a sintered copper alloy, the material of the elastic body is CR, and the hardness is Hs50.

For each of the damper bushes of Examples 1 to 2 and Comparative Examples 1 to 5 described above, the relationship between load and deflection was measured as follows.

After mounting the damper bush on the eye end, fit the fixing jig by fitting the hole part of the bush core to the load,
A load was applied to the eye end by a flexure measuring device, and the flexure of the damper bush was read and recorded by a recorder.
The results are shown in the graph of FIG.

In FIG. 11, (A) is Example 1, (B) is Example 2, (C) is Comparative Example 1, (D) is Comparative Example 2, (E) is Comparative Example 3, and (F). Is a curve showing Comparative Example 4, and (G) is a curve showing the measurement results of Comparative Example 5.

The curves (A and B) of Example 1 and Example 2 in FIG. 11 have a smaller inclination in the initial stage of operation than the curves (C, D, E, F, G) of Comparative Examples 1 to 5, Therefore, it rises with a large inclination as compared with the comparative example. From this result, Example 1
It can be seen that the damper bushes of ~ 2 provide smoother and "moderate" lever operation than the damper bushes of Comparative Examples 1-5.

As described above, the main difference between the slopes of the curves of the first and second embodiments is whether or not both ends of the major axis of the collar are covered with elastic bodies.

[Effect of device]

According to the damper bush of the present invention, a stroke is smoothly started at the operation start stage of the lever, and a "moderate" operation can be performed with an appropriate increase in the operation force on the way.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the damper bush of the present invention, FIG. 2 is a perspective view showing a bush core constituting the damper bush of FIG. 1, and FIG. II
(I)-(III) line sectional view, FIG. 4 is (IV)-(I of FIG.
V) line sectional view, FIG. 5 is a sectional view showing the dimensions and shape of the damper bush of Example 2, and FIGS. 6 to 10 are Comparative Example 1 respectively.
Sectional views showing the dimensions and shapes of the damper bushes Nos. 5 to 11,
Figure is a graph showing the test results of Examples and Comparative Examples, 12th
FIG. 13 is a cross-sectional view showing an example of a conventional damper bush, FIG. 13 is a cross-sectional view showing another example of a conventional damper bush, and FIG. 14 is a graph for explaining the relationship between the load applied to the damper bush and its deflection. Is. (Main symbols in the drawing) (1): Damper bush (2): Elastic body (3): Bush core (5): Cylindrical part (6): Collar part (9a), (9b): Recessed part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Open 61-166219 (JP, U) Open 51-110189 (JP, U) Open 62-21769 (JP, Y2)

Claims (3)

[Scope of utility model registration request] 1. A damper bush inserted into an eye end fixed to an end portion of a push-pull control cable, comprising: (a) a cylindrical portion and an outer periphery of the cylindrical portion in a plane perpendicular to an axis of the cylindrical portion. A bush core having rigidity, which is composed of an oval flange portion, and (b) a substantially cylindrical rubber-like elastic ring formed concentrically outside the bush core. (C) When the major axis direction of the collar portion is incorporated in the eye end along the axial direction of the push-pull control cable, the portions of the outer circumference of the elastic ring corresponding to both ends of the major axis of the collar portion are formed. , Each of the damper bushes is concave so that a space is provided between the inner circumference of the eye end and the inner circumference. 2. The damper bush according to claim 1, wherein the diameter of the concave portion on the outer circumference of the elastic ring is larger than the major axis of the flange portion. 3. The damper bush according to claim 1, wherein the diameter of the concave portion on the outer periphery of the elastic ring is made equal to the major diameter of the collar portion.