JP2002130350A - Spring seat rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make smooth an initial rising of a spring characteristic of a spring seat rubber. SOLUTION: An annular concave groove 3 is formed on the top face side of a ring shaped rubber main body 2, and a small protrusion 4 is installed in a protruding manner from the bottom thereof. The small protrusion 4 is made abut on a spring bracket 6 before non-linear spring characteristics starts rising with the collapse of the concave groove 3, and then the initial rising thereof becomes smooth because the tangential spring constant becomes large by degrees.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring seat rubber interposed between a coil spring of a suspension support and a spring bracket attached to a vehicle body.

[0002]

2. Description of the Related Art In general, in a suspension system for an automobile or the like, a so-called spring seat rubber is interposed between a coil spring and a spring bracket attached to a vehicle body. FIG. 3 shows an example of a suspension device provided with a spring seat rubber. This suspension device has a configuration in which a shock absorber 103 in which a piston rod 101 is attached to a vehicle body via a strut mount 102 and a coil spring 104 are combined.

The lower end of a coil spring 104 is attached to a lower bracket 10 attached to a shock absorber 103.
5 and the upper end of the coil spring 104 is attached to a spring bracket 106 attached to the vehicle body side.
Supported by Spring bracket 106
An annular concave part 107 whose open side is downward is formed on the outer periphery of the coil spring 104, and supports the upper end of the coil spring 104 via a spring seat rubber 108 fitted in the concave part 107.

[0004] The spring seat rubber 108 is
07 is a rubber-like elastic body having a substantially semicircular cross section that fits in
High-frequency vibrations and the like transmitted from the wheel side to the vehicle body side via the coil spring 104 are controlled to improve riding comfort. In addition, an annular concave groove 109 is formed on the upper surface side of the spring seat rubber 108 in contact with the concave portion 107,
By reducing the tangential spring constant when the deflection is small, microvibrations are easily attenuated, and shocks are easily absorbed to further improve ride comfort. On the other hand, when the deflection is large, the concave groove 109 is crushed, so that the tangential spring constant is increased, thereby limiting the amount of deflection.

[0005]

However, when the flexure of the spring seat rubber increases and the concave groove on the upper surface is crushed, the non-linear spring characteristic rises and the tangential spring constant suddenly increases. Vibration that suddenly pushes up through the vehicle may be transmitted, and the riding comfort may be degraded. Therefore, there is a need for a spring seat rubber that can prevent an extreme rise in spring characteristics.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a spring seat rubber interposed between a coil spring of a suspension support and a spring bracket attached to a vehicle body, when the deflection is small. The present invention provides a spring seat rubber capable of improving ride comfort by reducing the tangential spring constant of the above and preventing the rise of the nonlinear spring characteristic from becoming extreme.

[0007] Increasing the annular groove formed on the upper surface side of the rubber body in contact with the spring bracket can reduce the tangential spring constant when the deflection is small, but the deflection tends to increase and the nonlinearity increases. It becomes easy to reach the amount of deflection at which the spring characteristic rises. Further, in order to prevent the deflection from becoming too large, the rise of the nonlinear spring characteristic becomes extreme. On the other hand, if the concave groove is eliminated or reduced, the tangential spring constant is large even when the deflection is small, and the riding comfort is likely to be deteriorated.

In view of the above, if small projections formed in a ring shape continuously in the circumferential direction as a whole project from the bottom surface of the concave groove,
Before the concave groove collapses and the nonlinear spring characteristic rises, the small projection abuts the spring bracket and gradually increases the tangential spring constant. Can be prevented from becoming extreme.

Further, if the height of the small projection is set to about half the height of the concave groove, the small projection abuts on the spring bracket when a predetermined load is applied without vibration. In addition, the small projection can be brought into contact with or separated from the spring bracket with the vibration. In this case, when the small projection bends in the contacting direction, the tangential spring constant gradually increases, so that it is possible to prevent the deflection amount from becoming too large. In addition, when the small protrusion bends in a direction in which the small protrusion is separated, the tangential spring constant is small, so that the fine vibration can be easily attenuated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a spring seat rubber according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a spring seat rubber of the present invention.
FIG. 2 is a load-deflection characteristic diagram. The spring seat rubber 1 has a ring-shaped rubber body 2 having a substantially semicircular cross section, an annular groove 3 formed on the upper surface side of the rubber body 2, and an annular protrusion protruding from the bottom surface of the groove 3. 4 and an annular semicircular spring groove 5 formed on the lower surface of the rubber body 2 and are made of various rubber-like elastic bodies such as natural rubber.

The spring seat rubber 1 is provided with a spring bracket 6 so that the upper surface of the rubber body 2 comes into contact with the spring bracket.
And supports the upper end of the coil spring 7 fitted in the spring groove 5. Also, the height h1 of the projection 4
Is about half the depth h2 of the concave groove 3, and when a predetermined load is applied, the tip of the projection 4
Is to be abutted. The spring groove 5 may have a rectangular cross section, and the end of the coil spring 7 may be crushed into a substantially rectangular shape and fitted.

Next, the spring characteristics of the spring seat rubber will be described. In the load-deflection characteristic diagram of FIG. 2, the vertical axis indicates the magnitude of the load P acting on the spring seat rubber 1 from the coil spring 7, and the horizontal axis indicates the magnitude of the deflection δ at that time, that is, the coil with respect to the spring bracket 6. The displacement of the spring 7 is shown. In addition,
The unit is [N] (kgf) and [mm], respectively.

In FIG. 2, A is the relationship between the load P and the deflection δ of the spring seat rubber having a solid cross section without the concave groove 3 and B is the spring seat rubber provided with the concave groove 3 and the projection 4. C represents the relationship between the load P and the deflection δ, and C represents the relationship between the load P and the deflection δ of the pulling sheet rubber provided with only the concave groove 3. A, B and C spring seat rubber
The deflection when a load of P = 10000N is applied is δ
= 7 mm, and about 3000 N to 4000 N is assumed as the load (1 W) in a state where no vibration occurs.

As shown in FIG. 2, in the solid section A, the change in the tangential spring constant K (= ΔP / Δδ) is small, and the deflection δ
Is small, the tangential spring constant K is large. In the case of C provided only with the concave groove 3, the tangential spring constant K is small when the deflection δ is small, but the tangential spring constant K sharply increases because the deflection rises at about δ = 5 mm.

Therefore, in the spring seat rubber of A, it is difficult to obtain sufficient damping even when the deflection δ is small,
Hard to absorb shocks. Further, in the spring seat rubber of C, when the deflection δ is small, a sufficient damping can be obtained. However, when the deflection becomes δ = about 5 mm or more, vibrations such as suddenly pushing up are easily felt.

On the other hand, in the spring seat rubber of B,
The tangential spring constant K when the deflection δ is small is smaller than A, and sufficient damping can be obtained. In addition, since the tangential spring constant K gradually increases, the user does not feel vibrations that suddenly push up. Note that the tip of the projection 4 is configured to come into contact with the spring bracket 6 when a load (P1) slightly smaller than 1 W is applied.

[0017]

As is apparent from the above description, according to the present invention, by providing a projection on the bottom surface of the concave groove formed on the upper surface of the rubber body, it is possible to prevent the spring characteristic from rising extremely. The tangential spring constant can be reduced to improve the riding comfort.

[Brief description of the drawings]

FIG. 1 is a sectional view of a spring seat rubber of the present invention.

FIG. 2 is a diagram showing the load-deflection characteristics.

FIG. 3 shows a conventional suspension device having a spring seat rubber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spring seat rubber 2 Rubber body 3 Groove 4 Projection

Claims (2)

[Claims] 1. A spring seat rubber interposed between a coil spring of a suspension support and a spring bracket attached to a vehicle body side, the spring seat rubber being provided on an upper surface side of a rubber body contacting the spring bracket.
A spring seat rubber in which an annular concave groove is formed and small projections protrude from the bottom surface of the concave groove. 2. The spring seat rubber according to claim 1, wherein the height of the small projection is set to a height of about half the depth of the concave groove.