JPS637521Y2 - - Google Patents

Description

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

[Prior Art] As shown in FIG. 1, a suspension system using leaf springs fixes and supports brackets 3 and 4 at intervals at the front and rear of a chassis frame 2, and connects the brackets 3 with pins 5. An eyelet part 6 formed by winding one end of a leaf spring 10 is supported, and the eyelet part 6 at the other end is connected to a shackle 7 by a pin 5, and this shackle 7 is supported on a bracket 4 by a pin 8.

The stacked leaf springs 10 are stacked with a pad 13 on the upper side of their center and an axle 14 with an I-shaped cross section that supports the wheel on the lower side, and the U-bolts 9 that sandwich both side edges of these are stacked on the axle 14. It is inserted into the bolt hole of the flange and fastened with a nut. Chassis frame 2 is on top of pad 13
A stopper 12 made of an elastic block such as rubber that can come into contact with the lower surface of the plate spring 10 is coupled to the plate spring 10 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 made at the bottom edge of this hole.
is provided, and the pin 5 is fixed to the wall portion 3a by tightening a bolt 17 that crosses the slit 15 so as not to come off.

The support portion of the leaf spring 10 is often exposed to muddy water, dust, etc. splashed up from the road surface, and a sealing member is required to protect the fitting portion between the pin 5 and the center portion 6 of the leaf spring 10. It is also desired to prevent undesirable hitting noises caused by the collision between the eyeball part 6 and the wall part 3a of the bracket when the vehicle receives a lateral load when turning.

Conventionally, in order to prevent such hitting sounds and to seal the fitting portion between the pin 5 and the eyelet 6, a metal-wrapped bushing was placed inside the eyelet 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 surface of the wall portion 3a and the end surface of the eyepiece portion 6, and the end portion of the pin 5 passing through the bush 18 and the thrust washer 16 is inserted. It is supported by the wall portion 3a. pin 5
The bush 18 and the pin 5 are connected to each other through the passage 19 from the end of the
Grease is supplied to the fitting part.

However, this does not function satisfactorily for the following reasons. Since the centerpiece 6 is formed by wrapping around the end of the leaf spring 10,
The thrust washer 16 is easily worn due to the edge 6a (FIG. 1) of 0, and dust and the like are likely to directly enter the circumferential surface of the pin 5 from this portion. 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. Further, the thrust washer 16 is subject to accelerated wear due to 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 (moved in the axial direction).

In the seal lip disclosed in Japanese Utility Model Application Publication No. 56-13005 and Publication No. 56-32119, the elasticity of the seal lip is weak, and after long-term use, it stretches outward from the diameter, and the thrust washer is directly damaged. Since it hits the end face of the bracket and the wall of the bracket, it cannot be expected to have a knocking sound prevention effect.

[Problems to be Solved by the Invention] The purpose of the invention is to provide a shaft of a suspended leaf spring support part that can prevent hitting noise caused by the axial movement of the eye of the leaf spring and the infiltration of dust into the shaft support part. The purpose of the present invention is to provide a sealing device.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the present invention is such that the thrust washer is sandwiched and baked between the thrust washer that contacts the end face of the center portion of the leaf spring and the thrust washer that contacts the wall surface of the bracket. A pair of lips are provided on the inner circumferential edge of the elastic sealing member, which contact the circumferential surface of a pin that supports the eyepiece on the bracket, the end surface of the bushing fitted to the eyepiece, and the wall surface of the bracket.

[Function] The elastic sealing member 22 is baked between the thrust washer 31 that contacts the wall surface of the bracket 3 and the thrust washer 33 that contacts the end surface of the eyepiece 6, and the elastic sealing member 22 is compressed and seals between the wall surface of the bracket and the eyeball. Since each thrust washer is mounted between the end face of the portion 6 and the end face of the portion 6, a state in which each thrust washer is kept in close contact between the two is maintained, thereby preventing the thrust washers from making a sound.

Lips 22a and 22b are integrally formed on the inner peripheral edge of the elastic sealing member 22, so that the lips 22a and 22b are in contact with the circumferential surface of the pin 5, the wall surface of the bracket 3, and the end surface of the bush 18, respectively.
This prevents dust from entering the sliding parts.

[Embodiment of the invention] As shown in FIG. 4, a shaft sealing device 2 according to the invention
0 is composed of a thrust washer 32 that contacts the end surface of the center portion 6 of the leaf spring 10, a thrust washer 31 that contacts the wall surface of the bracket 3, and an elastic seal member 22 such as rubber that connects these together.

In the embodiment shown in FIG.
2 is made of a flat annular plate that is easy to process, whereas the thrust washer 31 has an inner peripheral edge bent and is embedded inside the elastic sealing member 22 . Such a shaft sealing device 20 includes an elastic sealing member 22 made of rubber or the like between the thrust washers 31 and 32.
It is constructed in one piece by sandwiching and baking.

A lip 22a is provided on the inner peripheral edge of the elastic seal member 22.
22b is integrally formed. The lip 22a is elastically pressed against the wall surface of the bracket 3 and the circumferential surface of the pin 5. The lip 22b is elastically pressed against the end surface of the bush 18 and the circumferential surface of the pin 5.

The bush 18 is made of a bearing metal, and is fitted and fixed to the centerpiece 6 of the leaf spring 10 so as to cause relative movement between the bush 18 and the pin 5.

As mentioned above, the present invention has a button 18 in the center part 6.
Since they are fitted together, the gap between the edge 6a of the center portion 6 of the leaf spring and the outer peripheral surface of the pin 5 is closed by the bush 18, and an elastic seal member 22 is baked between the thrust washers 31 and 32. because there is,
The end face of the eyelet part 6 is closed by a thrust washer 32 to prevent dust from entering the sliding part of the pin 5 from the outer circumferential side of the eyelet part 6. Even if dust enters through the gap in the edge 6a, the lip 22b will not hold the bush 18.
Since the end face of the bush 18 and the circumferential surface of the pin 5 are in contact with each other, intrusion into the sliding portion between the bush 18 and the pin 5 is prevented. Furthermore, dust entering along the outer peripheral surface of the pin 5 through the slit 15 in the wall portion 3a is blocked by the lip 22a that contacts the wall surface of the bracket 3 and the peripheral surface of the pin 5. In this way, the sliding portion between the bush 18 and the pin 5 is always kept clean, and damage and wear caused by infiltration of dust and the like is prevented.

Since the elastic seal member 22 is connected between the thrust washers 31 and 32, the thrust washers 31 and 32 are attached to the wall portion 3 by the elastic force.
a and the eyelet portion 6, lateral displacement of the leaf spring 10, that is, axial movement of the eyelet portion 6 with respect to the pin 5, is suppressed by elastic deformation of the elastic seal member 22, and generation of tapping noise is prevented.

One thrust washer 32 is flat, so it is easy to process, and by bending the inner peripheral edge of the other thrust washer 31, this inner peripheral edge is embedded in the center of the elastic sealing member 22, so that the lip 22a , 22b are firmly held.

In the embodiment shown in FIG.
The inner peripheral edge of the thrust washer 33 is bent toward the center of the elastic seal member 22, and the outer peripheral edge of the thrust washer 33 is bent toward the center of the elastic seal member 22. A lip 2 is formed on the inner peripheral edge of the elastic seal member 22.
2a and 22b are formed in the same way as in the embodiment shown in FIG.
By forming this, the infiltration of dust and the like from the outer peripheral side toward the pin 5 along the wall portion 3a is more reliably prevented.

In FIG. 5, for ease of understanding, there is a gap between the thrust washer 31 and the wall surface of the bracket 3, but in reality, the lips 22a, 22 are arranged so that the thrust washer 31 is in contact with the wall surface.
c is elastically brought into close contact.

In the embodiment shown in FIG. 6, the thrust washer 35 in contact with the eyepiece 6 is flat, and the inner and outer edges of the thrust washer 34 in contact with the wall surface of the bracket 3 are bent toward the center of the elastic seal member 22. It is something. Elastic seal member 22
Lips 22a and 22b are integrally formed on the inner peripheral edge of the wall 3a, and a lip 22c that contacts the wall portion 3a is integrally formed on the outer peripheral edge.

In the embodiment shown in FIG. 7, a pair of thrust washers 36 are arranged symmetrically, and an elastic seal member 22 is baked between them.
Lips 22a and 22b are integrally formed on the inner peripheral edge of the eyepiece 2, and a lip 22d, which is in contact with the eyepiece 6, is formed symmetrically with the lip 22c on the outer peripheral edge.

In the embodiment shown in FIG. 8, the inner peripheral edges of the pair of left and right thrust washers 37 are bent toward the center of the elastic seal member 22 and are integrally connected to the elastic seal member 22. The lips 22a and 22b are integrally formed outside the inner peripheral edge of the thrust washer 37. In this example as well, the lip 2
2a is elastically deformed, and the thrust washer 37 is brought into close contact with the wall surface of the bracket 3.

In the embodiment shown in FIG. 9, the pair of thrust washers 36 and the elastic seal member 22 are similar to the example shown in FIG. 7, but are fitted into a sleeve 21 in which the bush 18 is divided into two parts. An end flange 21a of the sleeve 21 is brought into contact with the end surface of the eyepiece 6, and one thrust washer 36 is pressed against this end flange 21a. According to this embodiment, the gap between the end edge 6a of the eyepiece 6 is completely closed by the end flange 21a, so that dust and the like are completely prevented from entering from the outer circumferential side toward the pin 5.

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, the present invention has an eye part on the inner peripheral edge of the elastic seal member which is sandwiched and baked between the thrust washer that contacts the end face of the eye part of the leaf spring and the thrust washer that contacts the wall surface of the bracket. Since a pair of lips are provided that contact the circumferential surface of the pin that supports the shaft on the bracket, the end surface of the bush that fits into the eye, and the wall surface of the bracket, (a) manufacturing and installation of the shaft sealing device is easy; can be,
The elastic sealing member coupled between the pair of thrust washers prevents impact sounds caused by axial movement of the eye with respect to the pin.

(b) The lip provided on the inner peripheral edge of the elastic seal member prevents dust from entering the sliding portion between the eye and the pin, thereby maintaining lubrication of the sliding portion.

(c) An elastic seal member is baked and bonded between a pair of thrust washers, so that when the shaft seal device is clamped between the eye and the bracket with a preload applied in the axial direction, , the pair of thrust washers are always kept uniformly pressed against the bracket and the eye.

(d) Since the elastic seal member is baked between the pair of thrust washers, deformation of the elastic seal member radially outward in response to an axial load is suppressed, and durability is improved.

[Brief explanation of drawings]

Fig. 1 is a side view of a suspension device using a leaf spring, Fig. 2 is a perspective view of the same leaf spring support, Fig. 3 is a front sectional view of a shaft sealing device of a conventional suspension leaf spring support, and Fig. 4 is a side view of a suspension device using a leaf spring.
The figure is a front cross-sectional view of a shaft sealing device for a suspended leaf spring supporter according to the first embodiment of the present invention, and FIGS. 5 to 9 are front cross-sectional views of shaft sealing devices according to second to sixth embodiments of the present invention. be. 2: Chassis frame, 3: Bracket, 5:
pin, 6: eyepiece, 10: leaf spring, 15: slit, 17: bolt, 18: bush, 20: shaft sealing device, 21: sleeve, 22: elastic sealing member,
22a, 22b, 22c, 22d: Lip, 31
~37: Thrust washer.

Claims (1)

[Scope of utility model registration request] The peripheral surface of the pin that supports the eye on the bracket and the eye on the inner circumferential edge of the elastic seal member sandwiched and baked between the thrust washer that contacts the end surface of the eye of the leaf spring and the thrust washer that contacts the wall surface of the bracket. 1. A shaft sealing device for a suspension leaf spring support part, characterized in that a pair of lips are provided in contact with the end surface of a bush fitted into the bracket and the wall surface of a bracket.