JP4157070B2 - Elastic bushing for vibration isolation - Google Patents

Description

  The present invention relates to a vibration-proof elastic bush, and in particular, an elastic body is provided between an outer cylinder and an inner cylinder, the outer cylinder is attached to one member, and the inner cylinder is attached to the other member. The present invention relates to an anti-vibration elastic bush that connects the two through an elastic body.

Some vehicles include a power unit including an internal combustion engine and a transmission, or a suspension member attached to a subframe, and the subframe is attached to the vehicle body so that the power unit or the suspension member is attached to the vehicle body.
In this type of vehicle, in order to attenuate the vibration of the power unit and the vibration of the suspension member and transmit the vibration to the vehicle body, the sub frame is attached with an anti-vibration mounting member.
As this mounting member, there is known an anti-vibration elastic bush provided with a rubber-like elastic body between an outer cylinder and an inner cylinder (for example, see Patent Document 1).
Japanese Patent Laying-Open No. 2003-97629 (FIG. 5)

FIG. 20 is a diagram for explaining a conventional basic configuration.
According to the vibration-proof elastic bush 300, the rubber-like elastic body 303 is provided between the outer cylinder 301 and the inner cylinder 302, the outer cylinder 301 is press-fitted into the mounting hole 305 of the subframe 304, and a bolt is inserted into the inner cylinder 302. The inner cylinder 302 is attached to the vehicle body frame 308 by inserting 306 and fixing the inner cylinder 302 with the nut 307.
Thus, the sub frame 304 is attached to the vehicle body frame 308 via the vibration-proof elastic bush 300.

Therefore, when vibration is generated in the subframe 304 and the force F5 is applied to the outer cylinder 301 in the direction perpendicular to the axis 309 as indicated by an arrow, the rubber-like elastic body 303 between the outer cylinder 301 and the inner cylinder 302 is applied to the outer cylinder 301. A compression force acts.
As a result, the rubber-like elastic body 303 compresses and absorbs vibration, and attenuates the vibration transmitted to the inner cylinder 302. By attenuating the vibration of the inner cylinder 302 attached to the vehicle body frame 308, the vibration transmitted to the vehicle body frame 308 is attenuated.

  In addition, when a compressive force is applied to the rubber-like elastic body 303 in which the intermediate plate is embedded in the rubber-like elastic body, a relatively large spring constant of the rubber-like elastic body 303 can be secured. Therefore, the amount of displacement of the subframe 304 is suppressed, and vibrations generated in the subframe 304 are satisfactorily damped.

However, according to the anti-vibration elastic bush 300, the outer cylinder 301 and the inner cylinder 302 have peripheral walls formed in parallel to the axis 309, and a rubber-like elastic body 303 is provided on these peripheral walls.
For this reason, when vibration occurs in the subframe 304 and a force F6 is applied to the outer cylinder 301 in the direction of the axis 309, a shearing force acts on the rubber-like elastic body 303.

When a shearing force is applied to the rubber-like elastic body 303, it is difficult to ensure a relatively large spring constant of the rubber-like elastic body 303 as compared with a case where a compressive force is applied.
Therefore, it is difficult to suppress the displacement amount of the subframe 304, and it is difficult to satisfactorily attenuate the vibration generated in the subframe 304.

As a countermeasure, a protrusion 303 a is formed at the lower end of the rubber-like elastic body 303, and the protrusion 303 a is brought into contact with the stopper fitting 311.
This ensures a relatively large spring constant of the rubber-like elastic body 303 when the force F <b> 6 is applied to the outer cylinder 301 in the direction of the axis 309.
Therefore, the amount of displacement of the subframe 304 is suppressed, and vibrations generated in the subframe 304 are satisfactorily attenuated.

Here, in consideration of the case where the force F6 is applied to the outer cylinder 301 in the direction of the axis 309, in order to set the spring constant of the rubber-like elastic body 303 to a preferable state, the protrusion of the rubber-like elastic body 303 is used. It is necessary to suitably adjust the pressing force when the stopper fitting 311 is brought into contact with 303a.
A spacer 312 is disposed between the inner cylinder 302 and the stopper fitting 311 in order to adjust the pressing force applied to the protrusion 303 a by the stopper fitting 311.

However, in consideration of assembly tolerances and the like generated when attaching the vibration-proof elastic bushing 300, it is difficult to suitably adjust the pressing force to the protrusion 303a with the spacer 312 having a certain thickness.
For this reason, when attaching the vibration-proof elastic bushing 300, it is necessary to select the thickness of the spacer 312 so that the pressing force to the protrusion 303a by the stopper metal fitting 312 is suitably secured. This hinders simplification of the mounting operation of the elastic bush 300.

  An object of the present invention is to provide a vibration-proof elastic bushing that can secure a vibration-proofing effect and can simplify installation work.

The invention according to claim 1 incorporates the inner cylinder inside the outer cylinder, provides an elastic body between the outer cylinder and the inner cylinder, attaches the outer cylinder to one member, and attaches the inner cylinder to the other member. Thus, in the elastic bushing for vibration isolation in which the respective members are connected via the elastic body, the outer periphery of the inner cylinder is provided with an inner cylinder large-diameter portion having a large diameter at least partially in the axial direction, and the outer cylinder An outer cylinder small diameter portion having a small diameter is provided at least partially in the axial direction on the inner circumference of the cylinder, the inner cylinder large diameter portion and the outer cylinder small diameter portion are opposed to each other, and the inner cylinder large diameter portion and the outer cylinder small diameter portion a vibration isolating elastic bushing provided with the elastic body between the at least partially a larger inner cylinder large-diameter portion of the diameter, the diameter toward the end portion of the inner cylinder is gradually large Kunar so The outer cylinder small diameter portion which is formed in a valley shape with the inclined surface of the inner cylinder inclined to the at least partly the diameter The inner cylinder inclined surface and the outer cylinder are formed in a mountain shape with the outer cylinder inclined surface facing the inner cylinder inclined surface and inclined so as to gradually increase in diameter toward the end of the outer cylinder. The inner cylinder inclined surface and the outer cylinder inclined surface are made different from each other so that an interval between the inclined surface gradually increases toward an end of the vibration-proof elastic bushing, and the inner cylinder inclined surface and The elastic body is provided between the inclined surfaces of the outer cylinder, and the outer diameter of the inner cylinder large diameter portion formed in the valley shape is the smallest diameter portion and the outer cylinder small diameter portion formed in the mountain shape is the smallest diameter portion. The cylinder, the inner cylinder, and the elastic body are divided so as to be orthogonal to the axial direction, and an outer cylinder small-diameter portion formed in the mountain shape is provided at the center in the axial direction on the inner circumference of the outer cylinder, and the outer cylinder the inner peripheral end except for the outer tube small-diameter portion of, and formed parallel to the axial direction octopus The features.

The inner cylinder is provided with an inner cylinder large-diameter portion at least partially large in the axial direction, and the outer cylinder is provided with an outer cylinder small-diameter portion at least partially small in the axial direction. The part and the inner cylinder small diameter part were opposed to each other. And the elastic body was provided between the inner cylinder large diameter part and the inner cylinder small diameter part.
Therefore, for example, even when the outer cylinder vibrates in the axial direction, a compressive force is applied to the elastic body provided between the inner cylinder large diameter portion and the inner cylinder small diameter portion so that the spring constant in the axial direction of the elastic body is relatively Secure large.
Thereby, the amount of displacement of the outer cylinder can be suppressed, and the vibration generated in the outer cylinder can be attenuated satisfactorily.

Furthermore, according to the elastic bushing for vibration isolation, the spring constant in the axial direction of the elastic body is relatively set inside the elastic bushing for vibration isolation by making the inner cylinder large diameter portion and the inner cylinder small diameter portion face each other. Means for ensuring a large amount can be incorporated.
Therefore, it is not necessary to adjust the pressing force with respect to the protrusion of the elastic body, which has been required when incorporating a normal vibration-proofing elastic bush into the member, with the spacer.
Thereby, the installation work of the elastic bushing for vibration isolation can be simplified.
Further, the outer cylinder, the inner cylinder, and the elastic body are divided so as to be orthogonal to the axial direction. Thus, for example, by dividing the vibration isolating elastic bushing into two perpendicularly to the axial direction, the spring constant of one of the vibration isolating elastic bushes and the spring constant of the other vibration isolating elastic bushing are divided. It becomes possible to make it different.
This makes it possible to suitably combine the spring constant of one vibration-proof elastic bush and the spring constant of the other vibration-proof elastic bush in accordance with the vibration conditions of the vibrating body. The damping effect can be further enhanced.

  A second aspect of the present invention is configured by a plurality of divided bodies obtained by dividing the outer cylinder in the axial direction, and the minimum distance from the axis to the outer cylinder small-diameter portion is smaller than the maximum distance from the axis to the inner cylinder large-diameter portion. And

By making the minimum distance from the axis line to the outer cylinder small diameter part smaller than the maximum distance from the axis line to the inner cylinder large diameter part, a large inclination of the outer cylinder small diameter part is ensured.
Therefore, for example, when the outer cylinder vibrates in the axial direction, the spring constant of the portion provided between the large diameter portion of the inner cylinder and the small diameter portion of the inner cylinder, that is, the spring constant in the axial direction of the elastic body is determined. Larger can be secured.

Here, when the minimum distance from the axis to the outer cylinder small-diameter portion is larger than the maximum distance from the axis to the inner cylinder large-diameter portion, when the inner cylinder is assembled inside the outer cylinder, the inner cylinder large It is difficult to incorporate the inner cylinder inside the outer cylinder by hitting the diameter portion.
Therefore, the outer cylinder is divided in the axial direction, and these divided bodies are arranged around the inner cylinder to be integrated.
Thereby, even if the minimum distance from the axis to the outer cylinder small-diameter portion is larger than the maximum distance from the axis to the inner cylinder large-diameter portion, the inner cylinder can be incorporated inside the outer cylinder.

In the first aspect of the invention, the inner cylinder large-diameter portion of the inner cylinder and the outer cylinder small-diameter portion of the outer cylinder are opposed to each other to ensure a relatively large spring constant in the axial direction of the elastic body. It is possible to attenuate well and there is an advantage that a vibration isolation effect can be secured.
In addition, there is an advantage that it is possible to simplify the mounting operation of the vibration isolating elastic bushing by incorporating a means for ensuring the spring constant in the axial direction of the elastic body into the vibration isolating elastic bush.
Furthermore, the vibration-proof elastic bushings are divided perpendicularly to the axial direction, and the spring constants of the divided vibration-proof elastic bushings are made different so that the spring constants are set appropriately according to the vibrations. There is an advantage that the damping effect can be further enhanced.

  In the invention which concerns on Claim 2, an outer cylinder is divided | segmented into an axial direction, and the advantage that the spring constant of the axial direction of an elastic body can be ensured more largely by ensuring the inclination of a small diameter part of an outer cylinder large. is there.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the driver, Fr is front, Rr is rear, L is left, R is right Indicates.

FIG. 1 is a perspective view showing a front structure of a vehicle body provided with a vibration-proof elastic bushing according to a first embodiment of the present invention.
The vehicle 10 includes a vehicle body front structure 20 that forms a front portion of the vehicle body. The vehicle body front structure 20 extends from the left and right front side frames (the other member) 21 and 21 extending in the longitudinal direction of the vehicle body and from the front side frames 21 and 21 to the vehicle longitudinal direction outside and in the vehicle width direction. Left and right upper frames 22, 22; left and right front damper housings 23, 23 spanned between the front side frames 21, 21 and the upper frames 22, 22; and front portions of the left and right front side frames 21, 21; And a front bulkhead 24 coupled to the front portions of the left and right upper frames 22, 22.

The front bulkhead 24 includes a lower cross member 25 extending in the vehicle width direction below the front portions of the left and right front side frames 21, 21, and left and right side stays 26, 26 extending upward from both ends of the lower cross member 25. And an upper cross member 27 extending in the vehicle width direction so as to be coupled to the upper ends of the side stays 26, 26.
From left and right ends of the upper cross member 27, left and right extensions 28, 28 extend obliquely rearward, and ends of the extensions 28, 28 are connected to the left and right upper frames 22, 22.

From the rear ends of the front side frames 21 and 21, left and right floor frames (other members) 31 and 31 are respectively extended toward the rear of the vehicle body.
The front and rear left and right ends of a front sub-frame (hereinafter referred to as “sub-frame”) 41 as one member are respectively connected to the front portions of the left and right front side frames 21 and 21 and the left and right floor frames 31 and 31. The parts (that is, the four end parts) are respectively suspended through the vibration-proof elastic bushes 40 according to the present invention (... indicates a plurality. The same applies hereinafter).

The subframe 41 has a horizontal engine 43 attached to the right half and a transmission 44 attached to the left half. The transmission 44 transmits power by extending a propeller shaft (not shown) rearward from the output side.
The engine 43 and the transmission 44 are integrally connected to constitute an engine / transmission unit 45.
Left and right stay structures 80 and 81 are provided at the left and right front ends of the subframe 41.

The left front damper housing 23 includes a front cushion 47 for the left front suspension 46.
Similarly, the right front damper housing 23 includes a front cushion 47 (not shown) of a right front suspension 46 (not shown).

FIG. 2 is a perspective view showing a subframe provided with the vibration-proof elastic bushing according to the first embodiment.
The sub-frame 41 is a metal material product, for example, an aluminum product or an aluminum alloy product (hereinafter collectively referred to as “aluminum alloy product”).
The sub-frame 41 has a substantially cross-beam shape in plan view, and has left and right vertical members 61 and 61 extending in the front-rear direction of the vehicle body, and a front portion extending in the left-right direction of the vehicle body so as to span between the front ends of these vertical members 61 and 61 The lateral member 62, the rear lateral member 63 extending in the left-right direction of the vehicle body so as to span between the rear ends of the left and right vertical members 61, 61, and the front lateral member 62 at the front end of the left and right vertical members 61, 61 Left and right connecting members 64 and 64 for connecting the left and right end portions are provided, and the left and right end portions of the rear horizontal member 63 are connected to the rear end portions of the left and right vertical members 61 and 61, respectively.

The left and right vertical members 61, 61 are side members of a molded product in which a square pipe made of, for example, a cylindrical extruded material (extruded molded product) is partially formed into an uneven shape.
The front horizontal member 62 is a round pipe cross member made of, for example, a cylindrical extruded material (extruded product).

The left and right connecting members 64, 64 are die-cast products having a substantially L shape in plan view, and are integrally provided with a vehicle body attachment portion 64a, and a fitting hole 64b (left side) penetrating in the vehicle body attachment portion 64a in the vertical direction. Only the fitting hole 64b is shown in FIG. Anti-vibration elastic bushings 40 and 40 are press-fitted into the fitting holes 64b and 64b, respectively.
The vertical members 61, 61 and the front horizontal member 62 are inserted into the left and right connecting members 64, 64, and the members 61, 61, 62 are joined together.

The rear horizontal member 63 is a cross member made of a die-cast product having a substantially H shape in plan view. Specifically, the rear horizontal member 63 is formed by forming the beam portion 66 in a curved shape that protrudes upward, and integrally forming left and right sub-vertical members 71, 71 extending in the front-rear direction of the vehicle body at the left and right ends, respectively. It is.
The left and right sub-vertical members 71 and 71 have fitting holes 72 and 72 penetrating in the vertical direction at the rear part. Anti-vibration elastic bushes 40 and 40 are press-fitted into the fitting holes 72 and 72, respectively.

  In this manner, the bolts 74 and 74 are inserted into the vibration-proof elastic bushes 40 and 40 in a state where the vibration-proof elastic bushes 40 and 40 are press-fitted into the fitting holes 64b and 64b of the left and right connecting members 64 and 64, respectively. . The inserted bolts 74 and 74 are attached to the front end portions of the left and right front side frames 21 and 21 (see FIG. 1).

Further, the bolts 74 and 74 are inserted into the vibration isolating elastic bushes 40 and 40 in a state where the vibration isolating elastic bushes 40 and 40 are respectively press-fitted into the fitting holes 72 and 72 of the left and right sub vertical members 71 and 71, respectively. The inserted bolts 74, 74 are attached to the left and right floor frames 31, 31 (see FIG. 1).
Accordingly, the sub-frame 41 is placed on the front portions of the left and right front side frames 21 and 21 shown in FIG. 1 and the left and right floor frames 31 and 31 via the four vibration-proof elastic bushes 40. Be suspended.

  The stay 82 of the left stay structure 80 is connected across the left connecting member 64 of the subframe 41 and the left end 25a of the lower cross member 25, and the right connecting member 64 and the right end of the lower cross member 25 of the subframe 41 are connected. The stay 82 of the right stay structure 81 is coupled across the portion 25b.

That is, the vibration-proof elastic bush 40 is press-fitted into the fitting hole 64 b of the left connecting member 64, and the base end portion 83 of the stay 82 is disposed at the lower end of the vibration-proof elastic bush 40.
Bolts 74 are inserted into the mounting holes 83a (see FIG. 3) of the base end 83 and the through holes 40a of the vibration-proof elastic bushing 40.

The front end of the bolt 74 is protruded upward from the through hole 40a, and the front end of the protruded bolt 74 is screwed to the front end of the left front side frame 21 (see FIG. 1).
Thereby, the base end portion 83 of the stay 82 is connected to the connecting member 64 on the left side of the subframe 41 through the elastic bushing 40 for vibration isolation.

  The distal end portion 84 of the left stay 82 is attached to the left end portion 25 a of the lower cross member 25 with bolts 85 and 85 and nuts 86 and 86.

Similarly, the vibration-proof elastic bush 40 is press-fitted into the fitting hole 64 b (not shown) of the right connection member 64, and the base end portion 83 of the stay 82 is disposed at the lower end of the vibration-proof elastic bush 40.
Bolts 74 are inserted into the mounting holes 83 a (not shown) of the base end portion 83 and the through holes 40 a of the vibration-proof elastic bushing 40.

The front end portion of the bolt 74 is protruded upward from the through hole 40a, and the front end portion of the protruded bolt 74 is screwed to the front end portion of the right front side frame 21 (see FIG. 1).
As a result, the base end portion 83 of the stay 82 is connected to the connection member 64 on the right side of the subframe 41 via the elastic bush 40 for vibration isolation.

The distal end portion 84 of the right stay 82 is attached to the right end portion 25 b of the lower cross member 25 with bolts 85 and 85 and nuts 86 and 86.
Hereinafter, the vibration isolating elastic bush 40 attached to the left connecting member 64 of the subframe 41 is selected as a representative example, and the configuration of the selected vibration isolating elastic bush 40 will be described in detail with reference to FIGS.

FIG. 3 is a perspective view showing the vibration-proof elastic bushing according to the first embodiment.
The anti-vibration elastic bush 40 includes upper and lower elastic bushes 87 and 88. The upper elastic bush 87 has an upper inner cylinder (inner cylinder) 92 disposed inside an upper outer cylinder (outer cylinder) 91 (see FIG. 6), and an upper elastic body between the upper outer cylinder 91 and the upper inner cylinder 92. This is a vibration-proof structure member provided with (elastic body) 93.
The upper elastic body 93 is a rubber elastically deformable member as an example.

The lower elastic bush 88 has a lower inner cylinder (inner cylinder) 95 disposed inside a lower outer cylinder (outer cylinder) 94 (see FIG. 6), and a lower elastic body between the lower outer cylinder 94 and the lower inner cylinder 95. This is an anti-vibration structure member provided with (elastic body) 96.
The lower elastic body 96 is a rubber elastically deformable member as an example.

The upper and outer cylinders 91 of the upper elastic bush 87 are press-fitted into the fitting hole 64b of the left connecting member 64 from above, and the lower outer cylinder 94 of the lower elastic bush 88 is lowered into the fitting hole 64b of the left connecting member 64. Press fit.
The base end portion 83 of the stay 82 is brought into contact with the lower end portion of the lower inner cylinder 95 of the lower elastic bush 88, and the bolt 74 is inserted from the mounting hole 83a of the base end portion 83.
Bolts 74 protruding from the mounting holes 83a are inserted into the through holes 92a and 95a of the upper and lower inner cylinders 92 and 95, respectively.

The threaded portion 74a of the bolt 74 is projected from the through holes 92a and 95a, and the projected threaded portion 74a is screwed to the front end portion of the left front side frame 21 (see FIG. 1).
As a result, the connecting member 64 on the left side of the sub-frame 41 is connected to the front end portion of the left front side frame 21.
The through holes 92a and 95a constitute a through hole 40a (see FIG. 2) of the vibration-proof elastic bush 40.

The stay 82 of the stay structure 80 is provided with a base end portion 83 on the left connecting member 64 of the subframe 41 and extends forward inward from the base end portion 83 toward the left end portion 25a of the lower cross member 25. This is a reinforcing member in which the distal end portion 84 is connected to the left end portion 25 a of the lower cross member 25.
The stay 82 has a rod 98 attached to the back surface thereof by welding or the like, and a pair of attachment holes 99 and 99 provided at the tip end portion 84. The rod 98 uses the front end portion as the hook portion 101 and the other portion as the guard portion 102.

The mounting holes 99, 99 of the stay 82 are aligned with the mounting holes 103, 103 of the left end portion 25b of the lower cross member 25, and bolts 85, 85 are inserted into the mounting holes 99, 103,. Nuts 86 and 86 are screwed to the tip ends of the protruding bolts 85 and 85.
Thereby, the tip end portion 84 of the stay 82 is attached to the left end portion 25b of the lower cross member 25 (see also FIG. 2).

The hook portion 101 is a member for hanging a tie-down or traction lock.
The hook 101 and the guard part 102 are extended to the lower part of the sub-frame 41 so that the sub-frame 41 is guarded in stages by hitting the obstacle before the sub-frame 41 hits an obstacle such as a curbstone. In addition, it is a member that informs the driver of the presence of an obstacle by sound or impact.

4 is a cross-sectional view taken along line 4-4 of FIG.
The upper elastic bush 87 is press-fitted into the fitting hole 64b of the connecting member 64 constituting a part of the subframe 41 from above, and the lower elastic bush 88 is press-fitted from below.
The base end portion 83 of the stay 82 is brought into contact with the lower end portion 95 b of the lower inner cylinder 95 of the lower elastic bush 88, and the bolt 74 is inserted from the mounting hole 83 a of the base end portion 83.
The bolt 74 protruding from the mounting hole 83 a is inserted into the through hole 95 a of the lower inner cylinder 95 and the through hole 92 a of the upper inner cylinder 92.

  The screw portion 74a of the bolt 74 protruding from the through hole 92a of the upper inner cylinder 92 is screwed to the front end portion of the left front side frame 21 (see also FIG. 1), so that the subframe is attached to the front end portion of the left front side frame 21. 41 connecting members 64 are connected.

5 is a cross-sectional view taken along line 5-5 of FIG.
The upper inner cylinder 92 of the upper elastic bush 87 is a member in which an upper part 105 is formed in an ellipse and a lower part 106 (see also FIG. 6) is formed in a circle.
In the ellipse of the upper part 105, the length of the major axis 107 is D1, the length of the minor axis 108 is D2, and the inner diameter of the lower part 106 is d1.
Bolts 74 are inserted into the upper inner cylinder 92. The inner periphery 111 of the upper elastic body 93 is provided on the outer periphery 109 of the upper inner cylinder 92, the outer periphery 112 of the upper elastic body 93 is provided on the inner periphery 113 of the upper outer cylinder 91 (see also FIG. 6), and the upper elastic body 93 is further provided. Cover the entire surface of the upper outer cylinder 91.

The upper elastic body 93 is a portion provided between the upper inner cylinder 92 and the upper outer cylinder 91 (see also FIG. 6), forms a substantially cylindrical body, and extends on the extended line of the short shaft 108 of the upper inner cylinder 92. Is provided with an opening 115.
Further, the upper elastic body 93 includes two semi-circular upper protrusions 117 and 117 along the upper outer periphery 116 a of the upper end portion 116 so as to be symmetric with respect to the long axis 107.

FIG. 6 is a perspective view showing the vibration-proof elastic bushing according to the first embodiment.
The anti-vibration elastic bush 40 is composed of upper and lower elastic bushes 87 and 88 that are divided substantially in the center in the direction of the axis 118 and perpendicular to the direction of the axis 118.
This anti-vibration elastic bush 40 presses the upper elastic bush 87 from above into the fitting hole 64b of the connecting member 64 shown in FIG. 88 is a member used in an integrated state.

  The upper elastic bush 87 incorporates the upper inner cylinder 92 inside the upper outer cylinder 91 and also provides an upper elastic body 93 between the upper outer cylinder 91 and the upper inner cylinder 92. An upper inner cylinder inclined surface 109 a that is inclined with respect to the axis 118 as an “inner cylinder large diameter portion at least partially large in the axial direction” is provided, and “ In the direction, an upper outer cylinder inclined surface 113a that is inclined with respect to the axis 118 as an outer cylinder small diameter portion at least partially having a small diameter is provided, and the upper inner cylinder inclined surface 109a is opposed to the upper outer cylinder inclined surface 113a. An upper elastic body 93 is provided between the upper outer cylinder inclined surface 113a and the upper inner cylinder inclined surface 109a.

  The lower elastic bush 88 incorporates a lower inner cylinder 95 inside the lower outer cylinder 94, and a lower elastic body 96 is provided between the lower outer cylinder 94 and the lower inner cylinder 95. A lower inner cylinder inclined surface 121 a that is inclined with respect to the axis 118 as an “inner cylinder large diameter portion at least partially large in the axial direction” is provided, and “ A lower outer cylinder inclined surface 122a that is inclined with respect to the axis 118 as an outer cylinder small-diameter portion having a small diameter at least partially in the direction, and the lower inner cylinder inclined surface 121a is opposed to the lower outer cylinder inclined surface 122a, A lower elastic body 96 is provided between the lower outer cylinder inclined surface 122a and the lower inner cylinder inclined surface 121a.

Thus, by dividing the vibration-proof elastic bushing 40 into two perpendicularly to the direction of the axis 118, the spring constant of the upper elastic bush 87 and the spring constant of the lower elastic bush 88 can be made different.
The spring constant of the upper elastic bush 87 and the spring constant of the lower elastic bush 88 will be described in detail with reference to FIG.

FIG. 7 is a cross-sectional view in the longitudinal direction of the inner cylinder showing the vibration-proof elastic bushing according to the first embodiment.
The upper inner cylinder 92 of the upper elastic bush 87 has an upper portion 105 formed in an elliptical shape and a long axis 108 (see FIG. 6) of the upper portion 105 is secured to be large as D1, and a lower portion 106 is formed in a circular shape and has an outer diameter of D3. The upper inner cylinder inclined surface 109a is formed between the upper part 105 and the lower part 106 in the outer periphery 109 of the upper inner cylinder 92.

That is, by securing the long axis 107 of the upper part 105 as large as D1, a distance (D1 / 2) from the axis 118 of the upper inner cylinder 92 to the outer periphery 109 of the upper part 105 is secured.
Further, by keeping the outer diameter of the lower portion 106 as small as D3, the distance (D3 / 2) from the axis 118 of the upper inner cylinder 92 to the outer periphery 109 of the lower portion 106 is kept small.
Here, by setting D1 to be the length in the major axis direction, a relatively large value is ensured with respect to the outer diameter D3. Therefore, the upper inner cylinder inclined surface 109a that connects the upper portion 105 and the lower portion 106 ensures a large inclination angle θ1.

  The upper outer cylinder 91 of the upper elastic bush 87 is provided with an overhanging portion 125 projecting outward on the upper portion 124. The upper portion 124 is formed in a circular shape so that the inner diameter of the upper portion 124 is as large as d2, and the lower portion 126 is formed. The upper outer cylinder inclined surface is formed between the upper part 124 and the lower part 126 of the inner periphery 113 of the upper outer cylinder 91 by suppressing the short axis 127 (see FIG. 10) of the lower part 126 to be as small as d3. 113a is formed.

That is, by ensuring a relatively large inner diameter of the upper part d2 and d2, a distance (d2 / 2) from the axis 118 of the upper outer cylinder 91 to the inner periphery of the upper part 124 is secured.
Further, by securing the short axis 127 (see FIG. 10) of the lower portion 126 as small as d3, the distance (d3 / 2) from the axis 118 of the upper outer cylinder 91 to the inner periphery of the lower portion 126 is kept small.
Here, d3 is set to a length in the minor axis direction, thereby ensuring a relatively small size with respect to the inner diameter d2. Therefore, the upper outer cylinder inclined surface 113a that connects the upper portion 124 and the lower portion 126 ensures a large inclination angle θ2.

Then, the upper outer cylinder inclined surface 113 a and the upper part 124 are opposed to the inner cylinder inclined surface 109, and the lower part 106 of the upper inner cylinder 92 is opposed to the lower part 126 of the upper outer cylinder 91.
An upper elastic body 93 is provided between the upper outer cylinder inclined surface 113a and the lower portion of the upper inner cylinder inclined surface 109a, and between the upper portion 124 of the upper outer cylinder 91 and the upper portion of the upper inner cylinder inclined surface 109a. The upper elastic body 93 is provided.

The lower inner cylinder 95 of the lower elastic bush 88 is a member formed substantially symmetrically with the upper inner cylinder 92 of the upper elastic bush 87. That is, the lower inner cylinder 95 and the upper inner cylinder 92 differ only in the inner peripheral shape, and the other shapes are vertically symmetric.
Therefore, the lower inner cylinder 95, like the upper inner cylinder 92, is formed such that the lower portion 132 is elliptical and the major axis of the lower portion 132 is large as D1, and the upper portion 132 is circular and the outer diameter is D3. The lower inner cylinder inclined surface 121a is formed between the lower part 131 and the upper part 132 in the outer periphery 121 of the lower inner cylinder 95 by keeping it small.

That is, by securing the major axis of the lower part 131 as large as D1, a distance (D1 / 2) from the axis 118 of the lower inner cylinder 95 to the outer periphery 121 of the lower part 131 is secured.
Further, by keeping the outer diameter of the upper part 132 as small as D3, the distance (D3 / 2) from the axis 118 of the lower inner cylinder 95 to the outer periphery 121 of the upper part 132 is kept small.
Here, by making D1 the length in the major axis direction, a relatively large amount is secured with respect to D3. Therefore, the lower inner cylinder inclined surface 121a that connects the lower portion 131 and the upper portion 132 ensures a large inclination angle θ1.

The lower outer cylinder 94 of the lower elastic bush 88 is a member formed vertically symmetrically with the upper outer cylinder 91 of the upper elastic bush 87.
The lower outer cylinder 94 of the lower elastic bush 88 includes a projecting portion 135 projecting outward from the lower portion 134, the lower portion 134 is formed in a circular shape, and the inner diameter of the lower portion 134 is secured as large as d2, and the upper portion 136 is elliptical. The lower outer cylinder inclined surface 122a is formed between the lower part 134 and the upper part 136 in the inner periphery 122 of the lower outer cylinder 94 by forming the shape and keeping the short axis of the upper part 136 as small as d3. .

That is, by securing the inner diameter of the lower part 134 as relatively large as d2, a distance (d2 / 2) from the axis 118 of the lower outer cylinder 94 to the inner periphery 122 of the lower part 134 is secured.
Further, by securing the short axis of the upper part 136 as small as d3, the distance (d3 / 2) from the axis 118 of the lower outer cylinder 94 to the inner periphery 122 of the upper part 136 is kept small.
Here, d3 is set to a length in the minor axis direction, so that it is relatively small with respect to d2. Therefore, the lower outer cylinder inclined surface 122a connecting the lower portion 134 and the upper portion 136 ensures a large inclination angle θ2.

Then, the lower outer cylinder inclined surface 122a and the lower part 134 are opposed to the lower inner cylinder inclined surface 121a, and the upper part 132 of the lower inner cylinder 95 is opposed to the upper part 136 of the lower outer cylinder 94.
An upper elastic body 93 is provided between the upper portion of the lower inner cylinder inclined surface 121a and the lower outer cylinder inclined surface 122a, and between the lower portion 134 of the lower outer cylinder 94 and the lower portion of the lower inner cylinder inclined surface 121a. An upper elastic body 93 is provided.

FIG. 8 is a cross-sectional view of the inner cylinder minor axis direction showing the vibration-proof elastic bushing according to the first embodiment.
The upper inner cylinder 92 of the upper elastic bushing 87 has an upper portion 105 formed in an oval shape so that the length D2 of the short axis 108 (see FIG. 6) and the length D1 of the long axis 107 (see FIGS. 6 and 7). The inclination angle θ1 of the upper inner cylinder inclined surface 109a is suppressed to be smaller than the inclination angle θ1 shown in FIG.

The upper outer cylinder 91 of the upper elastic bush 87 has a uniform inner diameter d2 from the upper part 124 to the lower end 126.
A lower elastic body 96 is provided between the upper inner cylinder 92 and the upper outer cylinder 91, and an opening 115 (see also FIG. 5) is formed in the lower elastic body 96.

  The lower inner cylinder 95 of the lower elastic bush 88 is formed by forming the lower part 131 in an elliptical shape, thereby suppressing the length D2 of the short axis to be smaller than the length D1 of the long axis (see FIGS. 6 and 7). The inclination angle θ1 of the inclined surface 121a is suppressed to be smaller than the inclination angle θ1 shown in FIG.

The lower outer cylinder 94 of the lower elastic bush 88 has a uniform inner diameter d2 from the lower part 134 to the upper part 136.
A lower elastic body 96 is provided between the lower inner cylinder 95 and the lower outer cylinder 94, and an opening 138 is formed in the lower elastic body 96 in the same manner as the upper elastic body 93.

FIGS. 9A to 9C are perspective views of members constituting the upper elastic bush according to the first embodiment. FIG. 9A shows the upper inner cylinder 92 and FIG. 9B shows the upper outer cylinder 91. (C) shows the upper elastic body 93.
As shown to (a), the upper inner cylinder 92 is a member which formed the upper part 105 in the ellipse, and formed the lower part 106 in the circle.
The upper part 105 is an elliptical cylindrical part in which the length of the major axis 107 is D1 and the length of the minor axis 108 is D2. The lower part 106 is a circular cylindrical part having an outer diameter D3.
The relationship between the length D1 of the major axis 107, the length D2 of the minor axis 108, and the outer diameter D3 is D1>D2> D3.

Therefore, on the outer periphery 109 of the upper inner cylinder 92, an upper inner cylinder inclined surface 109 a that gradually decreases in diameter from the upper part 105 toward the lower part 106 is provided between the upper part 105 and the lower part 106.
In addition, the inclination angle θ1 of the upper inner cylinder inclined surface 109a is maximized in the major axis 108 direction, gradually decreases from the major axis 108 direction to the minor axis 108 direction, and is minimized in the minor axis 108 direction.

As shown in (b), the upper outer cylinder 91 includes an overhanging portion 125 projecting outward from the upper portion 124, and the inner periphery 113 of the upper portion 124 is formed in a circular shape, and the inner periphery 113 of the lower portion 126 is formed. It is a member formed in an elliptical shape.
The upper part 124 has a circular shape with an inner diameter d2, and the lower part 126 has an elliptical shape in which the length of the major axis 128 is d2 and the length of the minor axis 127 is d3.
The relationship between the inner diameter d2, the length d2 of the major axis 128, and the length d3 of the minor axis 127 is d2> d3.

Therefore, the upper outer cylinder 91 includes an upper outer cylinder inclined surface 113 a that gradually decreases in diameter from the upper part 124 toward the lower part 126 between the upper part 124 and the lower part 126.
In addition, the inclination angle θ2 (see FIG. 7) of the upper outer cylinder inclined surface 113a is maximized in the minor axis 127 direction, gradually decreases from the minor axis 127 direction to the major axis 128 direction, and the major axis 128 direction. The inclination becomes 0 °.

  The upper elastic body 93 shown in (c) is provided with an upper inner cylinder 92 (see (a)) in the inner circumference 111 (see FIGS. 6 to 8), and has a substantially L-shaped cross section formed along the outer circumference 141. This is a substantially cylindrical elastically deformable rubber member provided with an upper outer cylinder 91 (see (b)) in the portion 142.

FIG. 10 is a plan view showing an inner cylinder and an outer cylinder constituting a part of the upper elastic bush according to the first embodiment.
The major axis 107 of the upper inner cylinder 92 and the minor axis 127 of the upper outer cylinder 91 are matched, and the minor axis 108 of the upper inner cylinder 92 and the major axis 128 of the upper outer cylinder 91 are matched.

By aligning the major axis 107 of the upper inner cylinder 92 and the minor axis 127 of the upper outer cylinder 91, as shown in FIG. 7, the upper inner cylinder inclined surface 109a having a large inclination angle θ1 and the inclination angle θ2 are obtained. The upper outer cylinder inclined surface 113a, which is largely secured, is made to face.
An upper elastic body 93 is provided between the upper inner cylinder inclined surface 109a with a large inclination angle θ1 and the upper outer cylinder inclined surface 113a with a large inclination angle θ2 (see FIG. 7).

On the other hand, by combining the short axis 108 of the upper inner cylinder 92 and the long axis 128 of the upper outer cylinder 91, as shown in FIG. 8, the upper inner cylinder inclined surface 109a with the inclination angle θ1 kept small, and the inclination angle The inner periphery 113 of the upper outer cylinder 91 having θ2 of 0 ° is made to face.
An upper elastic body 93 is provided between the upper inner cylinder inclined surface 109a in which the inclination angle θ1 is kept small and the inner periphery 113 of the upper and outer cylinders 91 having an inclination angle θ2 of 0 ° (see FIG. 8).

Next, an example in which vibration is reduced by the vibration-proof elastic bush 40 according to the first embodiment will be described with reference to FIG.
FIGS. 11A and 11B are views for explaining the action of the vibration-proof elastic bushing according to the first embodiment.
In (a), the vibration in the horizontal direction is applied from the subframe 41 to the elastic bush 40 for vibration isolation as indicated by the arrow F1.
Vibration is transmitted to the upper and outer cylinders 91 of the upper elastic bushing 87 of the vibration isolating elastic bush 40, and a compressive force is applied to the upper elastic body 93 between the upper outer cylinder 91 and the upper inner cylinder 92 to compress the elastic body (elastic deformation). To do.

Here, by applying a compressive force to the elastic body, the spring constant of the elastic body is ensured to a desired size.
Thereby, the amount of displacement of the upper outer cylinder 91 can be suppressed, and the vibration generated in the upper outer cylinder 91, that is, the subframe 41 can be attenuated satisfactorily.

  Even when vibration is transmitted to the lower outer cylinder 94 of the lower elastic bushing 88 of the vibration isolating elastic bushing 40, the lower outer cylinder 94, while suppressing the amount of displacement of the lower outer cylinder 94, similarly to the upper elastic bushing 87, That is, the vibration generated in the subframe 41 can be attenuated satisfactorily.

In (b), the vibration in the vertical direction is applied from the subframe 41 to the anti-vibration elastic bush 40 as indicated by the arrow F2. Vibration is transmitted to the upper outer cylinder 91 of the upper elastic bush 87 of the vibration-proof elastic bush 40.
Here, the upper outer cylinder inclined surface 113a of the upper outer cylinder 91 and the upper inner cylinder inclined surface 109a of the upper inner cylinder 92 are opposed to each other, and the upper outer cylinder inclined surface 113a and the upper inner cylinder inclined surface 109a are positioned above each other. An elastic body 93 was provided.

  Thus, even when vertical vibration is transmitted to the upper outer cylinder 91 as indicated by the arrow F2, the upper outer cylinder inclined surface 113a is placed on the upper elastic body 93 between the upper outer cylinder inclined surface 113a and the upper inner cylinder inclined surface 109a. The upper elastic body 93 can be compressed (elastically deformed) by applying a compression force orthogonal to the upper inner cylinder inclined surface 109a as shown by an arrow F3.

  Similarly, when vertical vibration is transmitted to the lower outer cylinder 94 of the lower elastic bushing 88 of the vibration isolating elastic bush 40 as indicated by the arrow F2, the lower outer cylinder inclined surface 122a and the lower inner cylinder inclined surface 121a The lower elastic body 96 can be compressed (elastically deformed) by applying a compressive force perpendicular to the lower outer cylinder inclined surface 122a and the lower inner cylinder inclined surface 121a to the lower elastic body 96 as shown by an arrow F4.

Here, the compressive force F3 of the upper elastic bush 87 and the compressive force F4 of the lower elastic bush 88 act in a vertically symmetrical direction.
That is, when the subframe 41 vibrates in the upward direction, the vibration is attenuated by the compression force indicated by the arrow F3. Further, when the sub frame 41 vibrates in the descending direction, the vibration is attenuated by the compression force indicated by the arrow F4.

Therefore, when the vibration in the vertical direction is transmitted to the upper outer cylinder 91 as indicated by the arrow F2, the spring constant in the direction of the axis 118 of the upper elastic body 93 is secured relatively large, and the spring in the direction of the axis 118 of the lower elastic body 96 is secured. Ensure a relatively large constant.
Thereby, the displacement amount of the upper outer cylinder 91 can be suppressed, and the vibration generated in the upper outer cylinder 91 can be attenuated satisfactorily.

  Further, according to the vibration isolating elastic bush 40, the upper elastic bush 87 has an upper elastic body in the upper elastic bush 87 by making the upper inner cylinder inclined surface 109a and the upper outer cylinder inclined surface 113a face each other. A means for ensuring a relatively large spring constant in the direction of the axis 118 of 93 can be incorporated.

In addition, by making the lower inner cylinder inclined surface 121a and the lower outer cylinder inclined surface 122a face each other, the spring constant in the direction of the axis 118 of the lower elastic body 96 is compared inside the lower elastic bush 88. It is possible to incorporate a means for ensuring a large size.
Therefore, it is not necessary to adjust the pressing force against the elastic body, which has been required when incorporating the normal vibration-proof elastic bush described in the prior art into the subframe, with the spacer. Thereby, the attachment work of the vibration-proof elastic bush 40 can be simplified.

Here, the vibration-insulating elastic bush 40 according to the first embodiment is composed of upper and lower elastic bushes 87 and 88 obtained by dividing the outer cylinder, the inner cylinder, and the elastic body perpendicular to the direction of the axis 118.
Thus, by dividing the vibration-proof elastic bushing 40 into two perpendicularly to the direction of the axis 118, the spring constant of the upper elastic bush 87 and the spring constant of the lower elastic bush 88 can be made different.
Accordingly, it becomes possible to suitably combine the spring constant of the upper elastic bush 87 and the spring constant of the lower elastic bush 88 in accordance with the vibration conditions of the vibrating body, and the damping effect of the vibration isolating elastic bush 40 can be further increased. It can be further enhanced.

  Next, the vibration-proof elastic bushings according to the second to fifth embodiments will be described with reference to FIGS. In the vibration isolating elastic bushings of the second to fifth embodiments, the same members as those of the vibration isolating elastic bushing 40 of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

Second Embodiment FIGS. 12A and 12B are views showing a vibration-proof elastic bushing according to a second embodiment of the present invention, where FIG. 12A is a cross-sectional view and FIG. 12B is a plan view. is there.
The anti-vibration elastic bushing 170 includes upper and lower elastic bushings 171 and 172. The upper elastic bush 171 includes an upper inner cylinder (inner cylinder) 174 disposed inside an upper outer cylinder (outer cylinder) 173, and an upper elastic body (elastic body) 175 between the upper outer cylinder 173 and the upper inner cylinder 174. It is a member of the vibration proof structure which provided.
The upper elastic body 175 is a rubber elastically deformable member as an example.

The lower elastic bush 172 includes a lower inner cylinder (inner cylinder) 178 disposed inside a lower outer cylinder (outer cylinder) 177, and a lower elastic body (elastic body) 179 between the lower outer cylinder 177 and the lower inner cylinder 178. It is a member of the vibration proof structure which provided.
The lower elastic body 179 is a rubber elastically deformable member as an example.

The upper outer cylinder 173 has an upper portion 173a and a lower portion 173b each formed in a cylindrical shape, and has an outer cylinder small diameter that is at least partially small in the axial direction between the inner periphery of the upper portion 173a and the inner periphery of the lower portion 173b. The upper outer cylinder inclined surface 181 is formed as a portion.
The upper outer cylinder inclined surface 181 is an inclined surface with the inclination angle θ2 kept constant, and is formed over the entire circumference of the upper outer cylinder 173 in this state.

The upper inner cylinder 174 has an upper part 174a and a lower part 174b each formed in a cylindrical shape. Between the inner circumference of the upper part 174a and the inner circumference of the lower part 174b, an “inner cylinder large at least partially in the axial direction” An upper inner cylinder inclined surface 182 as a “diameter portion” is formed.
The upper inner cylinder inclined surface 182 is an inclined surface that is inclined over the entire circumference of the upper inner cylinder 174 in such a state that the inclination angle θ1 is kept constant.
An upper elastic body 175 is provided between the upper outer cylinder inclined surface 181 and the upper inner cylinder inclined surface 182.

The lower elastic bushing 172 is formed by forming the lower outer cylinder 177 in the same manner as the upper outer cylinder 173 and the lower inner cylinder 178 in the same manner as the upper inner cylinder 174.
Therefore, similarly to the upper outer cylinder 173, the lower outer cylinder 177 includes a lower outer cylinder inclined surface 183 as “an outer cylinder small diameter portion having a small diameter at least partially in the axial direction”. The lower outer cylinder inclined surface 183 is formed in a substantially truncated cone shape over the entire circumference of the lower outer cylinder 177 with the inclination angle θ2 kept constant.
Similarly to the upper inner cylinder 174, the lower inner cylinder 178 includes a lower inner cylinder inclined surface 184 as “an inner cylinder large diameter portion having a large diameter at least partially in the axial direction”. The lower inner cylinder inclined surface 184 is formed in a substantially truncated cone shape over the entire circumference of the lower inner cylinder 178 with the inclination angle θ1 kept constant.

  According to the vibration isolating elastic bush 170 of the second embodiment, the upper elastic bush 171 includes the upper outer cylinder inclined surface 181 and the upper inner cylinder inclined surface 182, and the lower elastic bush 172 includes the lower outer cylinder inclined surface 183 and the lower By providing the inner cylinder inclined surface 184, it is possible to obtain the same effect as the vibration-proof elastic bush 40 of the first embodiment.

Furthermore, according to the vibration-proof elastic bushing 170 of the second embodiment, the lower outer cylinder inclined surface 183 and the lower inner cylinder inclined surface 184 are each formed in a substantially conical shape, so that the lower outer cylinder 177 and the lower inner cylinder are formed. When assembling with 178, it is not necessary to determine the assembly angle of the lower inner cylinder 178 with respect to the lower outer cylinder 177.
Therefore, the work of assembling the lower inner cylinder 178 to the lower outer cylinder 177 is simplified.

Third Embodiment FIG. 13 is a cross-sectional view showing a vibration-proof elastic bushing according to a third embodiment of the present invention.
The anti-vibration elastic bush 190 is formed by integrally forming upper and lower elastic bushes 87 and 88 that constitute the anti-vibration elastic bush 40 of the first embodiment.
In other words, the vibration-proof elastic bush 190 is a member having a vibration-proof structure in which the inner cylinder 192 is disposed inside the outer cylinder 191 and the elastic body 193 is provided between the outer cylinder 192 and the inner cylinder 192.

The outer cylinder 191 includes upper and lower outer cylinder inclined surfaces 113a and 122a. The upper and lower outer cylinder inclined surfaces 113a and 122a are the same as the inclined surfaces described in the first embodiment, and detailed description thereof is omitted.
The inner cylinder 192 includes upper and lower inner cylinder inclined surfaces 109a and 121a. The upper and lower inner cylinder inclined surfaces 109a and 121a are the same as the inclined surfaces described in the first embodiment, and detailed description thereof is omitted.

The upper inner cylinder inclined surface 109a is an inclined surface facing the upper outer cylinder inclined surface 113a. An elastic body 193 is provided between the upper inner cylinder inclined surface 109a and the upper outer cylinder inclined surface 113a.
The lower inner cylinder inclined surface 121a is an inclined surface facing the lower outer cylinder inclined surface 122a. An elastic body 193 is provided between the lower inner cylinder inclined surface 121a and the lower outer cylinder inclined surface 122a.

According to the vibration isolating elastic bush 190 of the third embodiment, the upper and lower outer cylinder inclined surfaces 113a and 122a and the upper and lower inner cylinder inclined surfaces 109a and 121a are provided, so that the vibration isolating elastic of the first embodiment is provided. The same effect as the bush 40 can be obtained.
In addition, according to the elastic bushing 190 for vibration isolation of the third embodiment, the number of parts can be reduced.

Fourth Embodiment FIGS. 14A and 14B are sectional views showing a vibration-proof elastic bushing according to a fourth embodiment of the present invention.
The anti-vibration elastic bushing 200 has the length of the short axis 202 of the outer cylinder 201 (hereinafter referred to as “short axis length”) as d4 and the length of the long axis 107 of the inner cylinder 192 (hereinafter referred to as “long axis”). D1) and the minimum distance (d4 / 2) from the axis 118 to the outer cylinder inclined surface 204 is smaller than the maximum distance (D1 / 2) from the axis 118 to the upper inner cylinder inclined surfaces 109a and 121a. It is a thing.
The anti-vibration elastic bushing 200 is the same as the anti-vibration elastic bushing 190 except for the contents described above, except for the anti-vibration elastic bushing 190 of the third embodiment.

By making the minimum distance (d4 / 2) from the axis 118 to the outer cylinder inclined surface 204 smaller than the maximum distance (D1 / 2) from the axis 118 to the upper inner cylinder inclined surfaces 109a, 121a, the outer cylinder 201 A large inclination angle θ3 between the cylinder inclined surfaces 204 and 204 is ensured.
As a result, when the sub frame 41 is vibrated vertically as indicated by the arrow F2, the compression force of the elastic body 193 can be increased.

Therefore, according to the vibration-proof elastic bushing 200 of the fourth embodiment, the same effects as those of the vibration-proof elastic bushing 190 of the third embodiment can be obtained.
In addition, according to the vibration-proof elastic bushing 200 of the fourth embodiment, the vibration-proof elastic bushing 200 can be used in various ways by ensuring a large inclination angle θ3 of the outer cylinder inclined surfaces 204, 204 of the outer cylinder 201. It becomes possible to apply to the conditions, and the use can be expanded.

However, in the vibration-proof elastic bushing 200 of the fourth embodiment, the short axis length d4 of the outer cylinder 201 is made smaller than the long axis length D1 of the inner cylinder 192. The surface 204 overlaps the upper inner cylinder inclined surfaces 109a and 121a of the inner cylinder 192 by a distance S1 in plan view.
For this reason, when the inner cylinder 192 is arranged in the outer cylinder 201, there is a possibility that the outer cylinder 201 and the inner cylinder 192 interfere with each other, and a device for arranging the inner cylinder 192 in the outer cylinder 201 is required. Is done.
Hereinafter, a first assembly example in which the inner cylinder 192 is arranged in the outer cylinder 201 will be described with reference to FIG. 15, and a second assembly example will be described with reference to FIGS.

FIGS. 15A and 15B are explanatory views showing a first assembly example in which the inner cylinder is arranged in the outer cylinder of the fourth embodiment.
The outer cylinder 201 is divided in the direction of the axis 118 to obtain two divided bodies 201a and 201a. The two divided bodies 201a and 201a are moved from both sides of the inner cylinder 192 as indicated by the arrow a, and the divided surfaces 201b of the respective divided bodies 201a and 201a are joined to each other to join the inner cylinder 192 in the outer cylinder 201. Arrange.

  Accordingly, as shown in FIG. 14, even if the short axis length d4 of the outer cylinder 201 is smaller than the long axis length D1 of the inner cylinder 192, the inner cylinder 192 is disposed at the assembly position in the outer cylinder 201. can do.

  In the first assembly example, the example in which the outer cylinder 201 is divided into two divided bodies 201a and 201a has been described. However, the number of divisions of the outer cylinder 201 is not limited to two, for example, three. It is also possible to divide into a plurality.

FIGS. 16A and 16B are first explanatory views showing a second assembly example in which the inner cylinder is arranged in the outer cylinder of the fourth embodiment, and the inner cylinder 192 is attached to the short axis 202 of the outer cylinder 201. A state in which the minor axis 108 is aligned is shown.
In (a), the gap S <b> 2 is secured between the outer cylinder 201 and the inner cylinder 192 by aligning the minor axis 202 of the outer cylinder 201 with the minor axis 108 of the inner cylinder 192.

  In (b), the inner cylinder 192 is inserted into the outer cylinder 201 as shown by an arrow b. By securing the clearance S <b> 2 between the outer cylinder 201 and the inner cylinder 192, the inner cylinder 192 can be inserted into the outer cylinder 201 so as not to hit the outer cylinder 201.

FIGS. 17A and 17B are second explanatory views showing a second assembly example in which the inner cylinder is arranged in the outer cylinder of the fourth embodiment, and the inner cylinder 192 is inserted into the outer cylinder 201. Indicates the state.
In (a), the inner cylinder 192 is inserted into the outer cylinder 201. In this state, the outer cylinder inclined surfaces 204 and 204 of the outer cylinder 201 face the inner cylinder inclined surfaces 109a and 121a of the inner cylinder 192.

  In (b), the inner cylinder 192 is rotated as indicated by an arrow c. That is, the long axis 107 of the inner cylinder 192 rotates toward the short axis 202 of the outer cylinder 201.

18A and 18B are third explanatory views showing a second assembly example in which the inner cylinder is arranged in the outer cylinder of the fourth embodiment, and the inner cylinder 192 is arranged in the outer cylinder 201. FIG. Indicates the state.
In (a), the major axis 107 of the inner cylinder 192 is aligned with the minor axis 202 of the outer cylinder 201. Thereby, even if the short axis length d4 of the outer cylinder 201 is smaller than the long axis length D1 of the inner cylinder 192, the inner cylinder 192 can be disposed at the assembly position in the outer cylinder 201.

  In (b), after the inner cylinder 192 is disposed in the outer cylinder 201, an elastic body 193 is provided between the outer cylinder 201 and the inner cylinder 192 by, for example, injection molding. Thereby, the elastic bushing 200 for vibration isolation is obtained.

The first assembly example described with reference to FIG. 15 and the second assembly example described with reference to FIGS. 16 to 18 are applied when the vibration-proof elastic bushing 200 is integrated.
The anti-vibration elastic bushes 40 and 170 according to the first and second embodiments can be assembled without applying the first and second assembling examples. is there.

Fifth Embodiment FIGS. 19A and 19B are perspective views showing an anti-vibration elastic bushing according to a fifth embodiment of the present invention.
The anti-vibration elastic bushing 210 has an outer periphery 212 of the inner cylinder 211 formed in a substantially rectangular shape, and moves the two divided bodies 214 and 214 arranged on both sides of the inner cylinder 211 as indicated by an arrow d. The outer cylinder 213 is formed by joining the dividing surfaces 214 a of the 214 and 214, and the inner cylinder 211 is disposed in the outer cylinder 213.
An elastic body (not shown) is provided between the outer cylinder 213 and the inner cylinder 211 by, for example, injection molding.
This elastic body is an elastically deformable member made of rubber, for example.

According to the vibration-proof elastic bushing 210 of the fifth embodiment, the same effects as those of the vibration-proof elastic bushing 40 of the first embodiment can be obtained.
In addition, according to the elastic bushing 210 for vibration isolation of the fifth embodiment, the elastic bushing 210 for vibration isolation can be applied to various conditions by forming the outer periphery 212 of the inner cylinder 211 in a substantially rectangular shape. It becomes possible, and the application can be expanded.

  In the anti-vibration elastic bushing 210 of the anti-vibration elastic bushing 210, the example in which the outer cylinder 213 is divided into the two divided bodies 214 and 214 has been described, but the number of divisions of the outer cylinder 23 is not limited to two. For example, it can be divided into a plurality of pieces such as three.

  In the first to fifth embodiments, the example in which the outer cylinder is attached to the sub-frame 41 and the inner cylinder is attached to the left and right front side frames 21 and 21 has been described. Even if it is attached to this member, the same effect of the invention can be obtained.

  In the first to fifth embodiments, the center of the outer circumference of the inner cylinder provided in the elastic bushings for vibration isolation 40, 170, 190, 200, 210 is formed in a concave shape, and the center of the inner circumference of the outer cylinder is convex. However, the same effect can be obtained by forming the center of the outer periphery of the inner cylinder in a convex shape and forming the center of the inner periphery of the outer cylinder in a concave shape.

Furthermore, in the above-described embodiment, the example in which the outer periphery of the inner cylinder is formed in an ellipse, a circle, and a substantially rectangular shape has been described. However, the outer periphery of the inner cylinder is not limited to this, and the application of the elastic bushing for vibration isolation It is possible to select appropriately according to the situation.
Furthermore, the shape of the inner periphery of the outer cylinder is not limited to that described in the above embodiment, and can be appropriately selected according to the use of the vibration-proof elastic bushing.

  In the above-described embodiment, the upper inner cylinder inclined surfaces 109a and 182 and the lower inner cylinder inclined surfaces 121a and 184 are described as an example of the “inner cylinder large diameter portion at least partially large in the axial direction”. However, the inner cylinder large-diameter portion is not limited to the inclined surface, and the inner cylinder large-diameter portion can be formed by a plane orthogonal to the axis 118.

  Further, in the above-described embodiment, the upper outer cylinder inclined surfaces 113a and 181 and the lower outer cylinder inclined surfaces 122a and 183 are described as examples as “the outer cylinder small diameter portion having a small diameter at least partially in the axial direction”. However, the outer cylinder small-diameter portion is not limited to the inclined surface, and the outer cylinder small-diameter portion can be formed by a plane orthogonal to the axis 118.

  The present invention is suitable for application to an anti-vibration elastic bush that connects each member via an elastic body by attaching the outer cylinder to one member and attaching the inner cylinder to the other member.

It is a perspective view which shows the vehicle body front part structure provided with the elastic bush for vibration proofing of 1st Embodiment which concerns on this invention. It is a perspective view which shows the sub-frame provided with the elastic bush for vibration isolation which concerns on 1st Embodiment. It is a perspective view which shows the elastic bush for vibration isolation which concerns on 1st Embodiment. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a perspective view which shows the elastic bush for vibration isolation which concerns on 1st Embodiment. It is sectional drawing of the inner cylinder long axis direction which shows the elastic bush for vibration damping which concerns on 1st Embodiment. It is sectional drawing of the inner cylinder short axis direction which shows the elastic bush for vibration damping which concerns on 1st Embodiment. It is a perspective view of each member which constitutes the upper elastic bush concerning a 1st embodiment. It is a top view which shows the inner cylinder and outer cylinder which comprise some upper elastic bushes which concern on 1st Embodiment. It is a figure explaining the effect | action of the elastic bush for vibration isolation which concerns on 1st Embodiment. It is a figure which shows the elastic bush for vibration proofing of 2nd Embodiment which concerns on this invention. It is sectional drawing which shows the elastic bush for vibration proofing of 3rd Embodiment which concerns on this invention. It is sectional drawing which shows the elastic bush for vibration proofing of 4th Embodiment which concerns on this invention. It is explanatory drawing which shows the 1st assembly example which arrange | positions an inner cylinder in the outer cylinder of 4th Embodiment. It is 1st explanatory drawing which shows the 2nd assembly example which arrange | positions an inner cylinder in the outer cylinder of 4th Embodiment. It is 2nd explanatory drawing which shows the 2nd assembly example which arrange | positions an inner cylinder in the outer cylinder of 4th Embodiment. It is 3rd explanatory drawing which shows the 2nd assembly example which arrange | positions an inner cylinder in the outer cylinder of 4th Embodiment. It is a perspective view which shows the elastic bush for vibration proof of 5th Embodiment which concerns on this invention. It is a figure explaining the conventional basic composition.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 20 ... Car body front part structure, 21 ... Front side frame (the other member), 41 ... Sub frame (one member), 31 ... Floor frame (the other member), 40, 170, 190, 200, 210 ... Elastic bushing for vibration isolation, 87, 171 ... Upper elastic bush, 88, 172 ... Lower elastic bush, 91, 173 ... Upper outer cylinder (outer cylinder), 92, 174 ... Upper inner cylinder (inner cylinder), 93, 175 ... Upper elastic body (elastic body), 94, 177 ... Lower outer cylinder (outer cylinder), 95, 178 ... Lower inner cylinder (inner cylinder), 96, 179 ... Lower elastic body (elastic body), 109 ... Upper inner The outer periphery of the cylinder, 109a, 182 ... the upper inner cylinder inclined surface (the inner cylinder large diameter portion at least partially large in the axial direction), 113 ... The inner periphery of the upper and outer cylinders, 113a, 181 ... the upper outer cylinder inclined surface (In the axial direction, at least partially a small diameter outer cylinder small diameter portion), 1 8 ... Axis line, 121 ... Outer circumference of lower inner cylinder, 121a, 184 ... Lower inner cylinder inclined surface (inner cylinder large diameter portion having a large diameter at least partially in the axial direction), 122 ... Inner circumference of lower outer cylinder, 122a , 183... Lower outer cylinder inclined surface (in the axial direction, at least a part of the outer cylinder having a small diameter) 191, 201, 213 ... Outer cylinder, 192, 211 ... Inner cylinder, 193 ... Elastic body, 201 a, 214 ... divided body, 204 ... inclined surface of outer cylinder, D1 / 2 ... maximum distance, d4 / 2 ... minimum distance.

Claims (2)

In addition to incorporating the inner cylinder inside the outer cylinder, an elastic body is provided between the outer cylinder and the inner cylinder, the outer cylinder is attached to one member, and the inner cylinder is attached to the other member, so that each member is elastic. In the elastic bush for vibration isolation connected through the body,
The outer periphery of the inner cylinder is provided with an inner cylinder large-diameter portion having a large diameter at least partially in the axial direction, and the outer cylinder small-diameter portion having a small diameter at least partially in the axial direction is provided on the inner periphery of the outer cylinder. Provided,
An elastic bushing for vibration isolation in which the inner cylinder large diameter part and the outer cylinder small diameter part are opposed to each other, and the elastic body is provided between the inner cylinder large diameter part and the outer cylinder small diameter part,
The large inner cylinder large-diameter portion of the at least partially radial, forming a valley shape in cylindrical slanted surface inner diameter toward the end of the inner cylinder is inclined to gradually large Kunar so,
The outer cylinder small-diameter portion having a small diameter at least partially is opposed to the inner cylinder inclined surface, and the outer cylinder inclined surface is inclined so that the diameter gradually increases toward the end of the outer cylinder. Formed into
The inclination angles of the inner cylinder inclined surface and the outer cylinder inclined surface are set so that the distance between the inner cylinder inclined surface and the outer cylinder inclined surface gradually increases toward the end of the vibration isolating elastic bush. Different,
The elastic body is provided between the inner cylinder inclined surface and the outer cylinder inclined surface,
The outer cylinder, the inner cylinder, and the elastic body are arranged in the axial direction at the smallest diameter part of the inner cylinder large diameter part formed in the valley shape and the smallest diameter part of the outer cylinder small diameter part formed in the mountain shape. Divided perpendicularly ,
Outer circumference of the outer cylinder is provided in the center in the axial direction with a small diameter outer cylinder formed in the chevron.
An elastic bushing for vibration isolation , wherein an end portion of the inner periphery of the outer cylinder excluding the outer cylinder small diameter part is formed in parallel to the axial direction .   The outer cylinder is constituted by a plurality of divided bodies divided in the axial direction, and the minimum distance from the axis to the outer cylinder small-diameter portion is made smaller than the maximum distance from the axis to the inner cylinder large-diameter portion. Item 2. An elastic bushing for vibration isolation according to item 1.

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