JPH0722509Y2 - Fluid-filled mount - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fluid-filled mount suitable for use in a vehicle body mounting portion of a vibration source such as a sunspension member extending in the front-rear direction of a vehicle from a wheel support member.

(Prior Art) When a suspension member such as a radius rod extending in the front-rear direction of a vehicle from a wheel support member is attached to a vehicle body, conventionally, a fluid-filled rubber bush having two fluid chambers, a fixed-shaped orifice, and an on-off valve for the fluid chamber is used. It was common to use.

(Problems to be solved by the invention) However, since such a rubber bush has a fixed orifice shape, it is not possible to obtain characteristics suitable for various situations.

Therefore, an object of the present invention is to provide a fluid-filled mount that can obtain characteristics adapted to various situations in a mount that receives not only an axial direction but also a swing load.

(Means for Solving Problems) In order to solve the above problems and achieve the object, the present invention provides a mounting member connected to a vibration source and a mounting member arranged on an outer peripheral side of the mounting member and connected to a vehicle body. A substantially cylindrical base member, an inner periphery of which is fixed to the mounting member, and an outer periphery of which is fixed to the base member to form an annular fluid chamber therein. Is fixed to the mounting member and the base member to define the annular fluid chamber in front and rear chambers,
A fluid-filled mount including a central elastic wall having a larger cross-sectional area than the end elastic wall, a passage formed in the base member so as to communicate the two chambers, and a control valve for variably controlling the passage area of the passage. Configured.

(Operation) According to the fluid-filled mount (10), the mounting member (1
Elastic bodies (32), (3) between the base member (21) and the base member (21)
Since 2) and (52) are fixed, the structural relationship of each member does not change even when subjected to a load in which the axis of the mounting member (11) is inclined, and the outer peripheral side of the mounting member (11) that is connected to the vibration source. The annular fluid chamber (41) surrounded by the end elastic walls (32) and (32)
The annular fluid chamber (41) is divided into front and rear chambers by the central elastic wall (52), and the flow passage area of the passages (81) ... Since it is variably controlled by ..., the characteristics adapted to various situations can be obtained, and the control valve (91) to which the base member (21) is attached can be easily assembled.

Since stress does not concentrate on the end elastic walls (32) and (32), the end elastic walls are excellent in durability, and the characteristics can be freely selected by the shape of the elastic body (cross-sectional area or the like).

Moreover, the central elastic wall (52), which defines the annular fluid chamber (41) into the front and rear chambers, has a larger cross-sectional area than the end elastic walls (32) and (32), and has different fluid movement capacities. Therefore, when the mounting member (11) moves in either the front-back direction or the axial direction, the fluid is constantly pushed from one of the chambers into the passage (61) having the control valve (71). , The cavitation does not occur in the other chamber due to negative pressure, and appropriate damping is stably obtained by the control valves (71) in the passages (61).

(Examples) Examples will be described below with reference to the accompanying drawings.

In FIG. 1 showing a central longitudinal cross-sectional view of a fluid-filled mount according to a reference example for explaining the present embodiment, (1) is a suspension member such as a radius rod, a torque rod or the like extending from a wheel support member in the front-rear direction of the vehicle. The suspension (1) is mounted on the vehicle body using the fluid-filled mount (10) of the present invention.

The fluid-filled mount (10) is a suspension member (1).
A mounting member (11) connected to the vehicle, a base member (21) connected to the vehicle body, an annular elastic body (31) for connecting the vehicle, an annular fluid chamber (41) inside the annular member, and a front and rear chambers. The partition part (51) and the orifice (61) that connects the two chambers with each other.
Consists of.

The mounting member (11) is a thick disk-shaped intermediate body (12) having an outer periphery of two tapered surfaces, and a truncated cone-shaped end body (1
Inserting holes (14) at the center by aligning 3) and (13) on the large diameter end face
The suspension member (1), for example, the front end of a radius rod is inserted into the insertion hole (14), and the bolt (5) is screwed into the front end of the suspension member (1). The mounting member (11) is tightened between the suspension member collar portion (6) and the suspension member collar portion (2).

The base member (21) is a cylindrical body (22) in which an annular plate portion (24) having a cylindrical portion (23) on the inner circumference and an annular plate portion (26) having a hollow portion (25) on the inner circumference are joined and fixed. Forming its cylindrical part (23)
An annular taper body (27), on the inner circumference of the end and the end of the hollow part (25)
(27) are formed by crimping, joining, and fixing, and the annular plate portions (24), (26) form mounting pieces (28) for mounting on the vehicle body, and mounting holes (29) are formed.

The annular elastic body (31) is made of shear-type and umbrella-type thick-walled rubber, and has an inner periphery baked on the outer periphery of the end bodies (13) and (13) of the mounting member (11) to form an annular body of the base member (21). Taper body (2
7), (27) is composed of front and rear end elastic walls (32), (32) whose outer periphery is burned on the inner periphery, and particularly, the end elastic walls (32),
The (32) is inclined with respect to the axis of the suspension member (1), and an annular fluid chamber (41) for enclosing a fluid such as oil is formed in the annular elastic body (31). That is, the inner peripheral walls (33) and (33) of the end elastic walls (32) and (32) are introduced to the annular fluid chamber (41) side and the end elastic walls with respect to the center line of the fluid-filled mount (10). (32) and (32) are inclined.

The partition wall portion (51) is a shear type in which the intermediate body (12) of the mounting member (11) and the outer circumference thereof are baked and the outer circumference is baked on the inner circumference of the cylindrical portion (23) of the base member (21). It is composed of a large diameter central elastic wall (52) made of meat rubber, and the partition wall (5
According to 1), the annular fluid chamber (41) is divided into two chambers, front and rear. A passage (61) that communicates the two chambers with each other is formed in the outer peripheral portion of the intermediate body (12) that constitutes the partition wall portion (51) substantially parallel to the center line, and the control valve (71) is further provided in the passage (61). ) Is provided.

Two passages (61) are provided to face each other in the diametrical direction, and the right side of one passage and the left side of the other passage are formed in a valve accommodating portion (62) having a large diameter, and a circular shape is formed in each accommodating portion (62). The control valve (71) including the slide valve (72) and the coil spring (75) is housed.

As shown in FIG. 2, the slide valve (72) is formed with an orifice (73) at the center and a spline-shaped notch (74) at the outer periphery, and the slide valve (72) is housed in the valve seat wall of the housing (62). The coil spring (75) is contracted between the spring seat (76) fitted in the housing (62) and the back surface of the coil spring (75). The elastic force of this coil spring (75) is set to a predetermined value at which the fluid pressure in one chamber rapidly rises due to the impact load, and at that time, the slide valve (7
2) to be retracted from the valve seat wall (63).

According to the fluid-filled mount (10) described above, first, the central elastic wall (52) has a larger cross-sectional area than the end elastic walls (32), (32) and has different fluid movement capacities. Since the amount of fluid movement between the two chambers before and after the annular fluid chamber (41) is reduced due to the longitudinal movement of (1), even if a sudden load in the tensile direction acts on the suspension member (1), the passage (61 ) It is possible to suppress the occurrence of cavitation in the fluid passing through), and obtain good damping characteristics.

And in particular, the annular elastic body (3) that surrounds the annular fluid chamber (41).
Since the elastic walls (32), (32) at the front and rear of 1) are umbrella type and are inclined with respect to the center line of the mount, the spring in the bending direction and the torsion direction of the suspension member (1) is different from the conventional rubber bush. The constant can be lowered, that is, soft elastic characteristics can be provided.

Therefore, as schematically shown in FIG. 3, the bending movement and the twisting movement of the suspension member (1) are allowed by the elastic deformation of the front and rear end elastic walls (32) and (32) which is soft and smooth. can do.

In addition, even if only the inner peripheral portion of the end elastic body is inclined largely with respect to the center line, the spring components in the bending and twisting directions become soft.

Furthermore, since a circular slide valve (72) and a control valve (71) consisting of a coil spring (75) are attached to the two communicating passages (61) of the two chambers, the center of the slide valve (72) is centered during normal vibration. The damping force is obtained only by the orifice (73), and when an impact load is applied, one slide valve (72) retracts and the fluid also flows to the spline-shaped notch (74) on its outer periphery. The amount of movement of the fluid increases, and sufficient damping can be obtained. That is, it becomes possible to provide characteristics adapted to various situations.

Moreover, since stress is not concentrated on the annular elastic body (31), the annular elastic body (31) has excellent durability, and the characteristics can be freely selected depending on the shape of the elastic body (cross-sectional area or the like).

Next, this embodiment will be described.

In the above-mentioned reference example, the flow passage area was variably controlled in two steps by moving the slide valve. However, in order to reduce microvibration, the flow passage area should be made smaller to suppress displacement feeling by sufficient damping, and to reduce pulse load. As a result, it is required to increase the flow passage area to reduce the spring constant as much as possible to suppress the force transmission, and immediately before reaching the maximum displacement, reduce the flow passage area to increase the spring constant to suppress the displacement. .

Therefore, as shown in FIG. 4, in this embodiment, a passage is not provided in the intermediate body (12) of the mounting member (11), and a passage (81) that connects the two chambers is formed in the base member (21). The member (80) is fixed and the partition valve (92) is installed in this passage (81).
Of the sluice valve (92) to the passage member (80) with a screw (9).
The control valve (91) is constructed by connecting with 9).

Then, the displacement speed, the displacement amount, etc. of the fluid-filled mount (10) are detected by an arbitrary means, and the operation control of the solenoid (95) is performed based on the information.

In this way, the control valve (9) including the solenoid (95) and the gate valve (92) whose operation is controlled based on the information such as the mount displacement speed and the displacement amount to change the flow passage area of the passage (81).
If the control is configured in a complicated manner according to 1), it is possible to satisfy not only the impact load but also the various requirements described above, and thus it is possible to obtain ideal damping according to various situations. .

As described above, according to the fluid-filled mount of the present invention, since the elastic body is fixed between the mounting member and the base member, the buffer support is provided even when the load of the mounting member is inclined. A ring-shaped fluid chamber surrounded by end elastic walls is provided on the outer peripheral side of the mounting member that maintains the function and is connected to the vibration source, and the ring-shaped fluid chamber is divided into two chambers by the central elastic wall. Since the flow passage area of the passage communicating between the two chambers is variably controlled by the control valve, it is possible to obtain characteristics adapted to various situations, and the control valve can be easily assembled.
Moreover, since stress is not concentrated on the end elastic wall, the durability is excellent, and the characteristics can be freely selected depending on the shape of the elastic body (cross-sectional area, etc.).

The central elastic wall that defines the annular fluid chamber in the front and rear chambers has a larger cross-sectional area than the end elastic walls, and has different fluid movement capabilities. Even when moving in the direction, the fluid is always pushed from one of the chambers into the passage having the control valve, so that the other chamber does not become negative pressure and cavitation does not occur. It is possible to stably obtain appropriate damping.

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view of a fluid-filled mount according to a reference example for explaining the present embodiment, FIG. 2 is a perspective view of a slide valve of the reference example, and FIG. 3 is a schematic view showing an action of an elastic wall. FIG. 4 is a central longitudinal sectional view of the fluid-filled mount according to the present invention. In the drawings, (1) is a suspension member, (10) is a fluid-filled mount, (11) is a mounting member, (21) is a base member, (31) is an annular elastic body, and (32) is an end elastic wall. , (41)
Is an annular fluid chamber, (51) is a partition wall, (52) is a central elastic wall,
(61) and (81) are passages, and (71) and (91) are control valves.

Claims (1)

[Scope of utility model registration request] 1. A mounting member connected to a vibration source, a substantially cylindrical base member arranged on the outer peripheral side of the mounting member and connected to a vehicle body, an inner periphery of the mounting member, and an outer periphery of the base. A pair of end elastic walls that are fixed to a member to form an annular fluid chamber inside and have substantially equal cross-sectional areas, and the inner and outer peripheries are fixed to the mounting member and the base member so that the annular fluid chamber is divided into front and rear chambers. A central elastic wall that is defined and has a larger cross-sectional area than the end elastic wall, a passage formed in the base member so as to communicate the two chambers, and a control valve that variably controls the flow passage area of the passage. A fluid-filled mount consisting of.