JPS6231283Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shaft sealing device for a leaf spring support portion in a vehicle suspension system.

[Prior Art] As shown in FIG. 1, a suspension system using leaf springs fixes and supports brackets 3 and 4 at the front and rear of a chassis frame 2 at intervals, and a pin 5 is attached to the bracket 3. While supporting the cylindrical part 6 formed by winding one end of the leaf spring 10, the other end of the cylindrical part 6 is connected to the shackle 7 with the pin 5, and the shank 7 is attached to the bracket 4 with the pin 8. I support it.

The stacked leaf springs 10 are stacked with a pad 13 on the upper side of their central parts, and an axle 14 with an I-shaped cross section that supports a wheel on the lower side, and the U-shaped bolts 9 that clamp both side edges of these are attached to the axles. It is inserted into the bolt hole of the flange No. 14 and fastened with a nut. A stopper 12 made of an elastic block such as rubber that can come into contact with the lower surface of the chassis frame 2 is connected to the pad 13 to restrict excessive deflection of the leaf spring 10 and to cushion the impact. .

As shown in FIG. 2, a hole through which a pin 5 is inserted is provided in a pair of left and right wall portions 3a of the bracket 3 that are parallel to each other. A slit 15 is provided at the lower edge of this hole, and a bolt 17 extending across the slit 15 is tightened to the wall 3a to fix the pin 5 so that it does not come out.

The support part of the leaf spring 10 is often exposed to muddy water and dust thrown up by the wheels, and the pin 5
A sealing member is required to protect the fitting portion between the leaf spring and the cylindrical portion 6 of the leaf spring. It is also desired to prevent undesirable hitting sounds caused by collision between the cylindrical portion 6 and the wall portion 3a of the bracket due to lateral loads generated when the vehicle body is tilted or when the vehicle turns.

Conventionally, in order to prevent such tapping sounds and to seal the fitting part between the pin 5 and the cylindrical part 6, a metal-wound bushing was placed inside the cylindrical part 6 of the leaf spring, as shown in FIG. 18 is fitted, and a thrust washer 16 made of metal or synthetic resin is interposed between the wall portion 3a and the end surface of the cylindrical portion 6.
The end of the pin 5 passing through the thrust washer 16 is supported by the wall 3a. Grease is supplied from the end of the pin 5 through the passage 19 to the fitting portion between the bush 18 and the pin 5.

However, this does not function satisfactorily for the following reasons. That is, since the cylindrical portion 6 is formed by wrapping around the end of the leaf spring 10, the thrust washer 16 is easily worn by the end edge 6a of the leaf spring 10 (FIG. 1), and the outer circumferential surface of the pin 5 is damaged from this part. It is easy for dust etc. to directly infiltrate. Further, dust and the like easily enter the fitting portion between the pin 5 and the bush 18 through the pin hole of the thrust washer 16 from the slit 15 in the wall portion 3a of the bracket. Furthermore, the thrust washer 16 is accelerated by the edge of the slit 15 in the wall portion 3a of the bracket, and generates a hammering sound when the leaf spring 10 is laterally displaced.

In the method disclosed in Japanese Utility Model Application Publication No. 56-32119, a seal lip is simply burned into the inner and outer peripheral edges of a single thrust washer, so even though the sealing effect for the shaft support part is sufficient, the shaft of the eyepiece part It cannot be expected to suppress the impact sound caused by directional movement.

[Problems to be Solved by the Invention] The purpose of the invention is to provide a shaft sealing device for a leaf spring support in a suspension system that can effectively prevent impact noise caused by axial movement of the eye of the leaf spring. It is in.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the present invention includes a 1-piece interposed between the eye of the leaf spring and the bracket.
Sealing members are baked onto the inner and outer peripheral edges of a pair of thrust washers to connect them to each other, and the insides are filled with air or oil.

[Function] The sealing members 24 and 23 connected to the inner and outer peripheral edges of the pair of thrust washers 22 prevent dust and the like from entering from the outside into the sliding portion between the eye portion 6 and the pin 5. Further, the pressurized air or oil filled into the space between the pair of thrust washers 22 suppresses the impact sound caused by the axial movement of the eyepiece 6.

[Example of the invention] The present invention will be explained based on an example.
As shown in FIG. 5, a bush 21 is fitted into the cylindrical part 6 of the leaf spring 10, and both ends of the pin 5 inserted into this are supported by the wall part 3a of the bracket, and are tightened with bolts 17. is the same as the conventional example.

According to the present invention, the shaft sealing device 20 interposed between the end surface of the cylindrical portion 6 and the inner surface of the wall portion 3a connects the outer peripheral edge of the pair of metal thrust washers 22 to the seal member 23 made of rubber or the like. At the same time, a sealing member 24 is similarly baked on the inner peripheral edge and joined together to form a fluid chamber 25 inside. By filling the fluid chamber 25 with air or liquid using a known air filler, one washer 22 is elastically attached to the end surface of the cylindrical portion 6, and the other thrust washer 22 is elastically attached to the inner surface of the wall portion 3a. press

As shown in FIG. 5, the seal member 24 includes a lip 24a that contacts the outer peripheral surface of the pin 5, a lip 24b that contacts the end surface of the bush 21, and a wall portion 3a.
A lip 24c that contacts the inner surface of the holder is integrally formed.

As described above, the present invention connects the inner and outer peripheral edges of two thrust washers 22 to each other with a sealing member, provides a fluid chamber inside, and fills this with fluid, thereby forming a pair of thrust washers 22.
can be pressed uniformly against the end surface of the cylindrical portion 6 and the inner surface of the wall portion 3a of the bracket. Therefore, even if the cylindrical portion 6 is slightly inclined with respect to the pin 5, the pair of thrust washers 2
2 independently come into close contact with the cylindrical part 6 and the wall part 3a, which can prevent dust etc. from entering from the outside into the space between the end face of the cylindrical part 6 and the inner surface of the wall part 3a. The slight rotation of the cylindrical portion 6 relative to the wall portion 3a caused by the bending of the cylindrical portion 6 is smoothed.

That is, the lips 24b and 24c completely prevent dust from entering from the outer circumferential side of the cylindrical portion 6 to the outer circumferential side of the pin 5, respectively. The lip 24a also prevents dust from entering the bush 21 from the slit 15 in the wall 3a along the outer peripheral surface of the pin 5. In this way, it is possible to completely prevent dust from entering between the sliding surface of the bush 21 and the pin 5 from the outside. Wear damage can be significantly reduced.

Further, the thrust washer 22 is connected to the seal member 2.
The elastic deformation of the slits 3 and 24 suppresses the relative sliding between the wall 3a and the cylindrical portion 6 to some extent, so the edges of the slit 15 and the edge 6a of the leaf spring are less susceptible to damage than in the conventional case. This reduces the amount of damage caused and extends the lifespan.

Furthermore, in order to prevent sideways sliding of the cylindrical portion 6 of the leaf spring 10, the pair of thrust washers 22 are always pressed against the inner surface of the wall portion 3a and the end surface of the cylindrical portion 6 by the pressure of the fluid chamber 25. Sound can be prevented.

It should be noted that the present invention can also be applied to the shackle 7 of a leaf spring, and the same effect can be obtained. In that case,
The wall portion 3a corresponds to the shackle 7.

[Effects of the Invention] As described above, in the present invention, since the sealing member is coupled to the inner and outer edges of a pair of thrust washers, manufacturing and installation are simple. and,
The sealing members provided on the inner and outer peripheral edges of the pair of thrust washers can prevent dust from entering the sliding area between the eye of the leaf spring and the pin that supports it on the bracket on the vehicle body side. Also, 1
The pressurized air or oil filled in the space between the pair of thrust washers can suppress collisions with the bracket due to axial movement of the eyepiece, thereby preventing the occurrence of hitting sounds.

[Brief explanation of the drawing]

FIG. 1 is a side view of a suspension system using a leaf spring, FIG. 2 is a perspective view of the same leaf spring support, and FIG. 3 is a front sectional view of a shaft sealing device of a leaf spring support in a conventional suspension system. FIG. 4 is a front cross-sectional view of the shaft sealing device of the leaf spring support portion in the suspension system according to the present invention, and FIG. 5 is an enlarged cross-sectional view of the same essential part. 2: Chassis frame, 3: Bracket, 3
a: Wall portion, 5: Pin, 6: Cylindrical portion, 10: Leaf spring, 15: Slit, 17: Bolt, 20: Shaft seal device, 21: Bush, 22: Thrust washer, 23, 24: Seal member, 24a, 24b,
24c: Lip, 25: Fluid chamber.

Claims (1)

[Scope of utility model registration request] A plate in a suspension system, characterized in that a pair of thrust washers interposed between the eye of a leaf spring and a bracket are bonded to each other by baking sealing members on the inner and outer peripheral edges thereof, and the insides thereof are filled with air or oil. Shaft sealing device for spring support.