JPH059924Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a suspension arm having a variable damping force fluid-filled bushing at its end.

(Prior Art) In the suspension of a vehicle, a fluid-filled bushing with a variable damping force is provided at the end of a suspension arm. Some of them are equipped with a drive control device for variable damping force.

(Problems to be Solved by the Invention) When the drive control device is exposed on the outer periphery of the fluid-filled bush as described above, protection of the drive control device becomes a problem.

Therefore, the purpose of the present invention is to improve the shape of the end of the suspension arm to protect the drive control device that protrudes from the outer periphery of the fluid-filled bushing.
In addition, it is an object of the present invention to provide a suspension arm that also contributes to improving the strength of the end portion.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a bifurcated portion 10 at the end of the suspension arm 1, and fixes a variable damping force type fluid-filled bushing 11 to the end of the bifurcated portion 10. A drive control device 61 for varying the damping force, which is fixedly installed on the outer periphery of the fluid-filled bush 11, is housed in the space S between the fork portions 10.

(Function) Fork part 1 provided at the end of suspension arm 1
Since the drive control device 61 is disposed between the drive control device 61 and the drive control device 61, the bifurcated portion 10 serves as a protection member for the drive control device 61. Furthermore, since the forked portion 10 has a higher strength than a single piece, it is advantageous in terms of countermeasures against buckling.

(Example) Examples will be described in detail below based on the accompanying drawings.

Figure 1 is a partial side view of the suspension arm.
FIG. 2 is an enlarged side view showing the fluid-filled bush in longitudinal section, and in the embodiment, a radius slot will be explained.

The radius rod 1 is made of a pipe, and the pipe end 2 is slightly bent downward with respect to the rod center line C, and the reinforcing plate 4 facing upwardly across the pipe end 2 and the rod center line C is formed at the pipe bent part. 3, the ends of the radius slot 1 are formed into upper and lower bifurcated portions 10. Such bifurcated portions 10 are constructed at both ends of the radius slot 1. In addition, an under guard plate 7 is provided at the pipe end 2 bent downward.
will be established.

Both the reinforcing plate 4 and the under guard plate 7 are of a channel type, and the side edges 5 and 8 protruding outward are joined and fixed at the pipe bending part 3, and a fluid is inserted between the front parts of the reinforcing plate 4 and the under guard plate 7. Entering button 1
1 is held, and its leading edges 6 and 9 are joined and fixed.
In addition, the tip of the pipe end 2 is connected to a fluid-filled bush 11.
Formed in an arc shape that follows the outer circumference of the

As shown in FIG. 3, the main body of the fluid-filled bush 11 includes an inner cylinder 12, an outer cylinder 13, and a holding cylinder 21.
It consists of a rubber wall 31 that connects the inner and outer cylinders 12 and 13.

A rubber wall 31 baked onto the outer periphery of the inner cylinder 12 and the inner periphery of the outer cylinder 13 is continuous with rubber wall parts 32, 32 that close between the inner and outer cylinders 12, 13 at both ends in the length direction of the cylinder. , inner and outer cylinders 1 at the middle part in the length direction of the cylinder
2 and 13 into two fluid chambers 0 ₁ and 0 ₂ . In addition, the rubber wall part 33 in the middle part
A stopper protrusion 34 that protrudes into both fluid chambers 0 ₁ , 0 ₂ is provided around the inner cylinder 12 , and a metal restraint ring is provided near the outer periphery of the rubber walls 32 , 32 at both ends. Boards 35, 35 are buried.

On the other hand, both lengthwise ends of the outer cylinder 13 are caulked to form inner flanges 14, 14, and the inner flanges 14, 14 are pressed against the ends of the restraining ring plates 35, 35, respectively. The outer cylinder 13 is attached to the holding cylinder 2.
1 and the outer periphery of the outer cylinder 13 and the holding cylinder 21.
The inner periphery is the full-circumference recess 1 at the middle part in the length direction of the cylinder.
5, 22 are formed, and seal rings 19, 19 are fitted between both longitudinal ends of the cylinder. Furthermore, the outer cylinder 13
There are circular holes 16 that open into the internal fluid chambers 0 ₁ and 0 ₂ .
..., 17 are formed on the surface of the recess 15. That is, one relatively large circular hole 17 is opened in one fluid chamber 0 ₂ , and three relatively small circular holes 16 are opened in the other fluid chamber 0 ₁ . In this way, a communication path 18 is created which communicates both the fluid chambers 0 ₁ and 0 ₂ between the circumferential recesses 15 and 22 between the outer cylinder 13 and the holding cylinder 21 and through the circular holes 16 . . . , 17 formed in the outer cylinder 13. Configure.

The holding cylinder 21 has the larger circular hole 17.
A circular hole 23 that is concentric with and larger is opened, and a cylinder 29 is tightly fitted into this circular hole 23 from the outside. This cylinder 29 is integrated with the pedestal plate 25, and its tip end is connected to the holding cylinder 21 in FIG.
It is flush with the inner circumferential surface of. Also pedestal board 2
5, as shown in FIG. 4, one joint piece 26 extending upward and two left and right joint pieces 2 extending downward.
7 and 27, and a cylinder 29 is fitted and fixed in the center of a pedestal part 28 in the middle thereof. This pedestal board 2
The joint pieces 26, 27, 27 of No. 5 are jointed and fixed to the outer periphery of the holding cylinder 21.

The holding cylinder 21 is fitted between the reinforcing plate 4 and the tip of the under guard plate 7, with the pipe end 2 facing between the joining pieces 27, 27 below the base plate 25, and These are joined and fixed together. Thus, the bifurcated portion 1 at the end of the radius slot 1
A fluid-filled bush 11 is held and fixed at the 0 end.

In the above, an opening 71 is formed at the tip of the under guard plate 7, and a drain hole 24 is formed through the holding cylinder 21, which is coaxial with the opening 71 and faces the communication path 18. A drain pipe 72 that is fitted and connected to the drain pipe 72 and protrudes from the opening 71
Screw on the drain socket 73.

The cylinder 29 of the pedestal plate 25 faces into the space S formed between the bifurcated portion 10 at the end of the radius slot 1.
A valve holder 41 is fitted inside. The valve holder 41 has a cylindrical shape, the outer periphery of the base is formed into a large diameter part 42 that fits inside the cylinder 29, a seal ring 43 is fitted to this large diameter part 42, and the large diameter part 42 is fitted with a seal ring 43.
An outer flange 44 having a larger diameter than the cylinder 29 is provided at the end. In addition, the outer periphery of the tip is connected to the larger circular hole 17.
This small diameter portion 45 is formed into a smaller diameter portion 45.
A rubber tube 47 that fits tightly into the circular hole 17 is fitted in the small diameter portion 45 and the rubber tube 47, and through holes 46 and 48 are opened in the small diameter portion 45 and the rubber tube 47 to penetrate in the radial direction. here,
The outer circumference of the rubber cylinder 47 has a smaller diameter than the inner circumference of the cylinder 29.

The valve 51 is rotatably fitted into the holder 41. The valve 51 has a base portion formed as a small diameter rod portion 52, a seal ring 53 fitted around the outer periphery of the rod portion 52, and a shaft hole 54 formed at the end of the rod portion 52. Further, the tip portion is formed into a cylindrical portion 55 having a large diameter, and this cylindrical portion 55 is provided with two valve holes 56 and 57 that penetrate in the radial direction as shown in FIG. Here, one valve hole 56 is connected to the through hole 4.
The valve hole 57 is made to have the same diameter as 6 and 48, and the valve hole 57 at a portion having a center angle different from this by 120 degrees is made to have a smaller diameter.

The above-mentioned valve 51 is rotatably assembled inside the holder 41, and a rod portion 52 protrudes from the end of the holder 41.
A circlip 59 is fitted to the end to prevent it from coming off, and the holder 41 incorporating the valve 51 is assembled into the cylinder 29 of the base plate 25, and the through hole 46 of the holder 41 and the rubber tube 47 is inserted. 48 to the communication path 18
Let's face it.

A drive control device 61 for the valve 51 is attached to the pedestal portion 28. The drive control device 61 consists of a mounting base 62 with a cylindrical case 63 that houses a valve switching mechanism using a motor, etc., fixed to the mounting base 62. From the end of the base 62, the valve switching mechanism rotates the rotation angle in three steps of 120° each. A drive shaft 64 that can be switched to protrudes. This drive shaft 64 is fitted into the shaft hole 54 at the end of the valve 51, and the left and right sides of the mounting base 62 are connected and fixed to the pedestal part 28 with bolts and nuts 65, 65. The drive control device 61 is thus housed in the space S between the bifurcated portions 10 of the radius slot 1, and the distal end of the case 63 is brought into contact with both side edges 5 of the reinforcing plate 4 to prevent sway.

By the way, the filling of hydraulic oil into the body of the fluid-filled bush 11 is completed by removing the drain stock 73, injecting the hydraulic oil, removing air from the inside through the drain pipe 72, and then screwing the drain stock 73 on. When such hydraulic oil is filled, the drain pipe 72
Three circular holes 16 are formed in the half circumference of the outer cylinder 13 on which the
Since... is formed, air can be removed reliably.

The radius slot 1 is equipped with the above-mentioned fluid-filled bushes 11 in the bifurcated portions 10 at both ends.
The inner cylinder 12 is installed in the longitudinal direction of the vehicle body by pivotally connecting one side of the inner cylinder 12 to a support shaft on the vehicle body side and the other to a support shaft on the side of a suspension component such as an axle housing.

In the above, the drive control device 61 for the valve 51
is operated by a control unit installed in the vehicle interior, and as shown in FIG.
48, fluid-filled bush 1
The hydraulic oil in the valve hole 56 is not restricted by the valve hole 56, so the compliance characteristics are soft.

When the smaller valve hole 57 is aligned with the through holes 46 and 48, the hydraulic oil is squeezed by the valve hole 57, and the orifice effect generates a damping force, making the compliance characteristic hard.

Moreover, when the through holes 46 and 48 are closed with the valve 51,
The communication path 18 is blocked by the valve 51, and communication between both fluid chambers 0 ₁ and 0 ₂ is therefore cut off, so that the compliance characteristic becomes the stiffest.

In this way, the radius rod 1 is provided with variable damping force type fluid-filled bushes 11 at the bifurcated portions 10 at both ends thereof, and the bushes 11 protrude from the main body, and the valve 5
The drive control device 61 that switches and operates the
Since the drive control device 61 is housed in the space S between
can be effectively protected from below by the pipe end 2 and under guard plate 7, and from above by the reinforcing plate 4.

Since channel-type reinforcing plates 4 are provided vertically facing the bending pipe end 2 across the rod center line C, the bending pipe end 2 is reinforced and its strength is improved in terms of buckling countermeasures. It will be sufficient.

In addition, the pipe end 2 has the forked portion 10 bent downward.
and the upper reinforcing plate 4 joined to this, so the reinforcing plate 4 does not protrude upwards that much, especially regarding the bifurcated part 10 that is pivotally supported on the vehicle body side.
It allows for a wide clearance with the vehicle body side above.

In the above embodiments, a radius slot has been described as a suspension arm, but it goes without saying that a similar structure can be adopted for other lower arms, upper arms, etc. It is also possible to simply provide a fluid-filled bush at one end.

(Effects of the invention) As described above, according to the invention, a bifurcated portion is provided at the end of the suspension arm, and a fluid-filled bushing with variable damping force is fixed to this bifurcated portion.
The drive control device for variable damping force, which is fixed on the outer periphery of the bushing body, is housed in the space between the two forks, which protects the drive control device and also improves the strength of the end of the suspension arm. Can be achieved together.

[Brief explanation of the drawing]

Figure 1 is a partial side view of the suspension arm.
Fig. 2 is an enlarged side view showing the fluid-filled bush in longitudinal section, Figs.
They are sectional views taken along the - line and the - line. In the drawing, 1 is a radius rod, 2 is a rod end, 4 is a reinforcing plate, 7 is an under guard plate, 10 is a bifurcated part, 11 is a fluid-filled bush, 12 is an inner cylinder,
13 is an outer cylinder, 18 is a communication path, 21 is a holding cylinder, 25
is a pedestal, 29 is a cylinder, 31 is a rubber wall, 41 is a valve holder, 47 is a rubber tube, 51 is a valve, 56,
57 is a valve hole, 61 is a drive control device, 63 is a case, 64 is a drive shaft, 73 is a drain stock, 0 ₁ ,
0 ₂ is a fluid chamber, and S is a space between two forks.

Claims (1)

[Claims for Utility Model Registration] (1) In a suspension arm having a variable damping force fluid-filled bushing at the end, a bifurcated portion is provided at the end of the arm, and a fluid-filled bushing is fixed to the end of the bifurcated portion, A suspension arm characterized in that a drive control device for varying damping force, which is fixed to the outer periphery of the fluid-filled bushing, is housed in a space between the two forked parts. (2) The suspension arm is a radius rod, and the bifurcated portion includes a rod end bent downward with respect to the rod centerline, and a rod end fixed to the bent portion of the rod end, and sandwiching the rod centerline. A suspension arm according to claim 1, which comprises a reinforcing member facing upwardly.