JPH021131Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a mounting structure for suspension leaf springs, and more specifically, it secures the sealing property of the center part of the leaf spring, prevents pin wear, and This invention relates to a suspension leaf spring mounting structure that prevents sideways sliding of the eyepiece and eliminates the occurrence of hitting sounds.

[Prior Art] In general, vehicles, particularly automobiles, have their bodies supported on axles by suspension systems in order to obtain a comfortable ride and excellent running stability.

The leaf spring type suspension system shown in FIG. 1 is a typical example of the above-mentioned suspension system. A leaf spring 1, which is a forged product, is fixed onto a housing 4 of an axle 3 by a U-bolt 5 or the like, and both ends 1a of the leaf spring type suspension system are It is attached to a bracket 2 fixed to a chassis frame (not shown).

The conventional attachment of the leaf spring 1 to the bracket 2 is as shown in FIG.
The centerpiece 11 of both ends 1a of the leaf spring 1 is sandwiched between metal or resin thrust washers 6 from both sides, and a pin 7 is inserted into these insertion holes 6a, 11a.
was inserted and attached to a bracket 2 fixed to the chassis frame 10. 8 is a tightening bolt for fixing the pin 7 to the bracket 2.

[Problems to be solved by the invention] However, the conventional leaf spring 1
When installing the leaf spring 1 to the bracket 2, the leaf spring 1 is protected against wear during initial assembly and during running.
Since the gap between the centerpiece 11 and the bracket 2 cannot be adjusted, if a lateral load is applied to the leaf spring 1, the leaf spring 1 will be adjusted by this gap.
There was a problem in which the washer skidded and collided with the thrust washer 6, producing a banging sound.

Then, due to the collision between the leaf spring 1 and the thrust washer 6, the thrust washer 6 is further damaged.
The wear of the pin 7 is accelerated, the hammering sound becomes louder, and the insufficient sealing causes dust to enter, causing the pin 7 to wear out as well.

In order to solve these problems,
Publication No. 41309 and Japanese Utility Model Application No. 56-32119 have been proposed.

However, in the crawler sealing device disclosed in the above-mentioned Japanese Utility Model Publication No. 51-41309, in which wear-resistant plates are interposed on both sides of the seal, there is a gap between one wear-resistant plate and the bushing, and a There is a risk that the seal between the adhesive plate and the link may not be formed, and dust may enter the outer periphery of the pin through the gap.

Further, in the leaf spring thrust washer disclosed in the above-mentioned Japanese Utility Model Publication No. 56-32119, there is a risk that the dust seal may enter the outer circumference of the pin from between the thrust washer and the eye, and there is a gap between the thrust washer and the bracket. Because of this, there is a risk that the thrust washer will collide with the bracket due to the sideways slipping of the eyeball, causing a knocking sound.

This invention was made in order to solve the problems of the conventional suspension leaf spring mounting structure, and its purpose is to prevent side slipping of the center part of the leaf spring in the suspension leaf spring mounting structure. The thrust washer has an inner lip that comes into contact with the outer periphery of the pin, and a side lip that comes into contact with the end face of the bushing and the inner wall of the bracket, respectively. As a result, sealing is performed between the eye and the thrust washer, between the inner wall surface of the bracket and the thrust washer, and between the outer peripheral surface of the pin and the thrust washer, so that the bush and the pin are sealed. It is an object of the present invention to provide a mounting structure for a leaf spring for suspension that is more durable and reliable by reliably preventing dust from entering between the parts and by preventing wear of the pins.

Furthermore, the thrust washer has a side lip formed at a portion of the inner peripheral portion that comes into contact with the bush end surface,
A suspension leaf having a thrust washer with improved sealing performance, allowing the shape of the side lip to be determined between the eyepiece part of the leaf spring, which is a forged product, and the bushing, which is manufactured by machining and has a higher finishing precision. The object of the present invention is to provide a spring mounting structure.

[Means for Solving the Problem] The suspension leaf spring mounting structure of this invention which achieves the above object has an annular plate attached to both sides of the annular elastic body except for the inner circumference, and a pin attached to the inner circumference. Thrust washers are interposed between the inner wall surface of the bracket and both sides of the center portion of the leaf spring, each having an inner lip that contacts the outer circumferential surface, and a side lip that contacts the end surface of the bush and the inner wall surface of the bracket.

[Function] In the suspension leaf spring mounting structure of this invention constructed as described above, the leaf spring 1 mounted in the bracket 2 is always pressed from the side by the thrust washer 20, so the leaf spring Even if a lateral load is applied to 1, the resulting lateral slip is absorbed by the elasticity of the annular elastic body 21, thereby suppressing the occurrence of hitting sounds.

Further, in the suspension leaf spring mounting structure of this invention, the inner peripheral portion 24 of the thrust washer 20
Inner lip 24a and side lip 24 provided on
b and 24c seal the contact parts S ₁ , S ₂ , and S ₃ between the bracket 2, pin 7, and bush 9, so that there is no space between the thrust washer 20 and the inner wall surface 12 of the bracket 2 and the end surface of the bush 9. The sliding surface between the dust pin 7 and the bush 9 has high sealing properties.
Intrusion into _S4 is reliably prevented and the pin 7 is prevented from wearing out.

Furthermore, the inner peripheral portion 24 of the thrust washer 20
The side lip 24 that comes into contact with the end surface of the bush 9
leaf spring 1, which is a forged product, forming b.
Since the shape of the side lip 24b can be determined between the bush 9, which is manufactured by machining and has a higher finishing precision than the centerpiece 11,
A thrust washer 20 having side lips with improved sealing performance is obtained.

[Example] Hereinafter, an example of this invention will be described with reference to FIGS. 3 to 6.

In the thrust washer 20 of this invention, an inner lip 24a that contacts the outer circumferential surface of the pin 7 is provided at the inner circumferential end of the inner circumferential portion 24 of the annular elastic body 21, and an inner lip 24a that comes into contact with the outer circumferential surface of the pin 7 is provided on both side surfaces thereof. The side lips 24b, 24 that come into contact with 12
c are formed respectively.

Further, as shown in FIG. 4, two metal plates 22 and 23 are fixed to both side surfaces of the annular elastic body 21 except for the inner peripheral portion 24 by baking or the like. Then, two thrust washers 20 formed in this manner are interposed between both sides of the center portion 11 of the leaf spring 1, which is a forged product, and the inner wall surface 12 of the bracket 2, as in the conventional case, as shown in FIG. These were then attached to bracket 2 with pin 7. Reference numeral 9 is a bush manufactured by machining as is well known and inserted between the pin 7 and the center portion 11 of the leaf spring 1, and 8 is a tightening bolt for fixing the pin 7 to the bracket 2.

The side lips 24b, 24c of the inner circumference 24 of the annular elastic body 21 are formed to have a height H projecting laterally beyond the two metal washers 22, 23, as shown in FIG. The inner diameter D of the lip 21a is made slightly smaller than the outer diameter of the pin 7. In addition, the thrust washer 2 of this invention
0, the wall thickness T of the metal plates 22 and 23 portion when no external force is applied from the side is the inner peripheral portion 24
The inner wall surface 12 of the bracket 2 is smaller than the wall thickness W of the bracket 2 from both sides of the leaf spring 1 shown in FIG.
Form it slightly thicker than the gap K up to
When mounted on the bracket 2, it is pressed so that its wall thickness becomes D.

Therefore, in the thrust washer of this invention, the leaf spring 1 installed in the bracket 2
is always pressed laterally by the thrust washer 20, so even if a lateral load is applied to the leaf spring 1, the resulting lateral slip is absorbed by the elasticity of the annular elastic body 21, preventing the generation of hitting sounds. It can be suppressed. In addition, in the thrust washer of this invention, as shown in FIG.
Since the abutting parts S ₁ , S ₂ , S ₃ between the end face of the bush 9 are sealed, the sealing performance between the thrust washer 20 and the inner wall face 12 of the bracket 2 and the end face of the bush 9 is high, and dust is removed. Intrusion into the sliding surface _S4 between the pin 7 and the bush 9 is reliably prevented, and the pin 7 is prevented from wearing out.

Note that the cushion rubber 21 may be made of elastic resin. In that case, they may be welded together or separated. Also, washers 22, 23
It is also conceivable to use a hard resin. In this case, the elastic body between them may be either rubber or elastic resin.

[Effects of the invention] The suspension leaf spring mounting structure of the invention includes annular plates attached to both sides of the annular elastic body except for the inner circumference, and an inner lip and a bush end face that abuts the outer circumference of the pin on the inner circumference. Thrust washers each having a side lip that abuts on the inner wall surface of the bracket are interposed between the inner wall surface of the bracket and both sides of the center portion of the leaf spring, so that the following effects can be obtained.

First, since the thrust washer is equipped with the annular plates on both sides of the annular elastic body except for the inner circumferential portion, it is possible to absorb the lateral slip of the leaf spring, so that there is a gap between the leaf spring and the thrust washer or between the thrust washer and the bracket. This prevents hitting sounds caused by impact.

Further, by mounting the annular plate, wear of the annular elastic body is prevented, and a thrust washer with improved durability and reliability can be provided.

Furthermore, since the thrust washer has the annular plate attached to both sides of the annular elastic body, even if the annular plate is worn out, the annular elastic body expands in the axial direction, so that the center portion and the bracket are This prevents the formation of a gap between the thrust washer and the thrust washer, and the soundproofing is further improved.

Further, an inner lip that contacts the outer peripheral portion of the pin, and a side lip that contacts the end face of the bush and the inner wall surface of the bracket are formed on the inner peripheral portion of the thrust washer, so that there is a gap between the eye portion and the thrust washer, and the inner lip of the bracket. Since seals are provided between the thrust washer and between the outer peripheral surface of the pin and the thrust washer, dust is reliably prevented from entering between the bush and the pin, and wear of the pin is prevented. , it is possible to provide a more durable and reliable suspension leaf spring mounting structure.

Furthermore, since the thrust washer has a side lip formed on the inner circumferential portion that comes into contact with the end surface of the bushing, the thrust washer is manufactured by machining and has a higher finish precision than the center part of the leaf spring, which is a forged product. Since the shape of the side lip can be determined, it is possible to provide a thrust washer having a side lip with improved sealing performance.

Furthermore, since the thrust washer is integrally constructed by attaching the plates to both sides of the annular elastic body, the number of parts does not increase and handling becomes easy.

[Brief explanation of drawings]

Figure 1 is a perspective view of the main parts of a conventional leaf spring suspension system, Figure 2 is an exploded perspective view of a conventional leaf spring mounting structure, and Figure 3 is a suspension leaf spring mounting structure of this invention. 4 and 5 are enlarged sectional views and partially cutaway perspective views showing the structure of the thrust washer shown in FIG. 3, and FIG. FIG. 2 is an enlarged cross-sectional view of the main parts of the proposed suspension leaf spring mounting structure. 1...Leaf spring, 2...Bracket,
7... Pin, 8... Tightening bolt, 9... Button, 11... Eyepiece, 12... Inner wall surface, 20...
Thrust washer, 21... annular elastic body, 22, 2
3...Metal annular plate, 24...Inner peripheral part, 2
4a...inner lip, 24b, 24c...side lip.

Claims (1)

[Scope of utility model registration request] Annular plates are attached to both sides of the annular elastic body except for the inner periphery, and a thrust washer is used as a leaf spring. A mounting structure for suspension leaf springs interposed between the inner wall surface of the bracket and both side surfaces of the eyeball portion.