JPS6221801Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a suspension stop lever.

Generally, in a suspension such as a strut-type suspension, a stop rubber is used to limit the stroke of the suspension, and a bellows-shaped stop rubber is known as one type of stop rubber.

However, since the above-mentioned conventional stop rubbers generally have the same wall thickness and pitch of the bellows over their entire length, irregular deformation or buckling occurs when the rubber is compressed, which causes local parts of the rubber to buckle. There was a problem that the distortion was large and the durability was poor.

To deal with this, there is a conventional structure disclosed in, for example, Japanese Utility Model Publication No. 53-49123. This is to slow the deformation of the open end side by setting the thickness of the peak part on the open end side of the stop rubber to be larger than the thickness of the central valley part and the wall thickness of the fixed side peak part.

However, in a stopper with such a structure,
During compression, the central trough bends inward and hits the piston rod, leaving no place for the rubber to escape.As a result, only a low compression ratio can be obtained, and the rubber wears due to contact with the piston rod.
There were problems such as the generation of fricative noise.

The present invention was developed in view of these circumstances, and its purpose is to deflect along the central axis, thereby preventing deformation such as buckling, and to direct the deflection direction of the center outward. The object of the present invention is to provide a stop rubber for a suspension that can obtain a large compression ratio by doing so.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the upper part of a strut type suspension according to an embodiment of the present invention, 1 is a strut, and the lower part of the cylinder 1a of the strut 1 is connected to the vehicle body via a suspension arm (not shown). attached. On the other hand, a mounting block 2 connected to the vehicle body (not shown) is attached to the upper end of the piston 1b of the strut 1, and a coil spring 3 is provided on the outer periphery of the strut 1 directly below the mounting block 2. There is. Further, reference numeral 4 denotes a stretchable rubber bellows material that covers the exposed portion of the cylinder 1a of the strut 1, and a bellows-shaped stop rubber 5 is integrally formed with the bellows material 4 on the upper part of the bellows material 4. When bumping, the strut 1 collides with the upper end surface of the cylinder 1a to limit the upward movement of the cylinder 1a, that is, the stroke of the suspension.

The stop rubber 5 is composed of an even number, for example, four peaks 5a ₁ to 5a ₄ and an odd number, for example, five valleys 5b ₁ to 5b ₅ . It is formed so that it is soft and becomes harder as it approaches both the upper and lower ends. That is, as shown in enlarged detail in FIG. 2, each of the outwardly protruding peaks 5a ₁ , 5a ₂ , . . .
The wall thickness t ₁ and width b ₁ of the troughs 5b 1 on both sides of the peaks 5a ₁ to 5a ₄ are set to be the same over the entire length, and the strengths are all set to be the same _. The wall thickness _t2 of ~ _5b5 is set such that it is thinnest at the central valley part _5b3 and becomes thicker as it approaches both ends. Furthermore, the valley portions 5b ₁ to 5
The width b ₂ of b ₅ is set to be narrowest at the central valley portion 5 b ₃ and to become wider as it approaches both sides. And, the inner diameter d ₁ of the valley portion 5b ₃ in the central part
is the inner diameter of the valleys 5b ₂ and 5b ₄ on both sides adjacent to this
The inner diameter d ₂ of the valley portions 5b ₂ and 5b ₄ on both sides is set to be larger than d ₂ and equal to each other. In addition, 6
is a rubber sheet.

Next, the operation of the above embodiment will be explained with reference to _FIG .
The wall thickness t ₁ and width b ₁ of 5a ₄ are the same over the entire length, and the wall thickness t ₂ of the valley portions 5b ₁ to 5b ₅ is the same as the central valley portion 5b ₃
The stop rubber 5 is thinnest and thickens as it approaches both ends, and is soft in the center and becomes harder as it approaches both the top and bottom ends, so it can be used when compressive force is applied to the stop rubber 5, such as when bumping. Initially, from the state shown in FIG. 3a, the central trough 5b ₃ is bent as shown in FIG. 3b, and then the troughs 5b ₂ and 5b ₄ are bent. At this time, since the inner diameter d ₁ of the central trough 5b ₃ is set larger than the inner diameter d 2 of the adjacent troughs _{5b 2} and 5b ₄ , the central trough 5b ₃ is larger than the adjacent trough 5b ₂ and 5b.
b ₄ and is pushed outward by the upper peak 5a ₂
is directed diagonally upward and outward, and the lower mountain portion _5a3 is directed diagonally downward. In this way, as shown in Figure c, the crests 5a ₂ and 5a ₃ are superposed to cover the ridges 5a ₁ and 5a ₄ , respectively. Thereafter, the above-described operation extends to both the upper and lower ends of the stop rubber 5, and the stop rubber 5 is compressed. In particular, in this case, the width b ₂ of the troughs 5b ₁ to 5b ₅ of the stop rubber 5 is set to be narrowest at the center and widen as it approaches both ends. Deformations occur more regularly. Furthermore, since this deflection is performed in such a way that the peak portions 5a ₂ and 5a ₃ swell outward diagonally upward and diagonally downward, respectively,
Extremely high compression ratio (approximately 70%) can be obtained.

Therefore, when a compressive force is applied to the stop rubber 5 in this way, the peaks 5a ₂ and 5a ₃ are polymerized so as to cover the peaks 5a ₁ and 5a ₄ , respectively, so that the peaks 5a ₁ and 5a ₄ The stop rubber 5 does not protrude in the lateral direction, so the stop rubber 5 constantly repeats a certain regular compression deformation, suppressing the occurrence of large local distortions such as buckling, and greatly improving its durability. be able to.

In addition, in the above embodiment, a case was explained in which the invention is applied to a bellows-shaped stop rubber used in a strut-type suspension, but the present invention can also be applied to a bellows-shaped stop rubber used in a wisdom-bone type suspension. , can produce similar effects.

As described above, according to the present invention, the following effects can be obtained.

The stop rubber according to the present invention consists of an even number of peaks and an odd number of valleys, all of the peaks are set to the same strength, and the center valley is the softest, and the valleys are softest toward both ends. It is formed hard. Therefore, while the shape in the direction of the central axis is maintained at the high-strength peaks, compression begins from the central trough, and polymerization progresses to both the upper and lower ends. As a result, regular deflection occurs, and local deformation such as buckling, in which the stop rubber deforms in an S-shape with respect to the central axis, does not occur, and durability can be greatly improved.

The inner diameter of the center valley is set larger than the inner diameter of the valleys on both sides adjacent to it.
When compression begins, this central trough swells outward;
Therefore, the peaks are directed outward diagonally upward and diagonally downward. Therefore, the bent rubber can escape to the outside space, making it possible to obtain a much higher compression ratio than structures found in conventional technology, as well as abrasion of the rubber and generation of friction noise due to contact with the piston rod. It is possible to solve problems such as

In addition, when the compression progresses and the peaks near both ends overlap, these peaks will be covered by the peaks near the center that were first polymerized, and the peaks near both ends will be subject to strong compressive force. The phenomenon of protruding outward due to the impact does not occur.

Since the inner diameters of the troughs adjacent to both sides of the central trough are equal to each other and larger than the inner diameter of the central trough, the peaks sandwiching the central trough bulge symmetrically in the vertical direction with respect to the central trough. Therefore, the compressive force is uniformly spread over the stop rubber, and from this point as well, durability can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is a side view showing the upper part of the strut type suspension, Fig. 2 is an enlarged vertical sectional view of the stop rubber, and Fig. 3 shows the compressive deformation state of the stop rubber over time. FIG. 5...Stotsu rubber, 5a ₁ to 5a ₄ ...Yamabe,
5b ₁ to 5b ₅ ... Valley part, t ₁ ... Thickness of mountain part, t ₂ ...
Thickness of the valley part, b ₁ ... Width of the peak part, b ₂ ... Width of the valley part,
d ₁ ... Inner diameter of the central valley, d ₂ ... Inner diameter of the valley adjacent to the central valley.

Claims (1)

[Scope of utility model registration request] In a bellows-shaped stop rubber that limits the stroke of a suspension, the stop rubber has an even number of peaks and an odd number of valleys, the wall thickness and width of each peak are the same over the entire length, and the valleys have an even number of peaks and an odd number of valleys. The wall thickness of the part is the thinnest at the center valley and becomes thicker towards both ends, and the width of the valley is the narrowest at the center valley and becomes wider towards both ends. A stop rubber structure for a suspension, characterized in that the inner diameter of the central trough is set larger than the inner diameter of the troughs on both sides adjacent to it, and the inner diameters of the troughs on both sides are set equal to each other. .