JPS61157845A - Leaf spring - Google Patents

Abstract

PURPOSE:To restrain the transverse deflection of a leaf spring to improve transverse rigidity thereof by supporting the leaf spring end with a support wall of a car body side bracket through a frictional spacer. CONSTITUTION:An eye portion 12 of an end of a leaf spring 10 is rotatably supported by a shaft 15 through a vibration absorbing bushing 14. The shaft 15 is provided to extend between support walls 16a, 16b of the car body side bracket 16. And a pair of frictional spacers 22 are provided between both side faces of the eye portion 12 and the support walls 16a, 16b to improve the trans verse rigidity of the leaf spring 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a leaf spring device in which attachment of leaf spring ends is improved.

[Conventional technology]

In the conventional leaf spring device, as illustrated in FIG. 14, one eyelet portion 1a of a leaf spring 1 is connected to a bracket 2 on the vehicle body side, and the other eyelet portion 1b is connected to the vehicle body side via a shackle 3. It is connected to the bracket 4. The above eyeball part 1a
Conventionally, as shown in FIG.
They were arranged on supports W2a and 2blJ and fixed by tightening with bolts 7 and nuts 8.

[Problem that the invention seeks to solve]

However, since the rubber bushing 3 is an elastic body, a load P in the width direction of the spring plate is applied to the leaf spring 1 when the vehicle turns.
When a lateral load (hereinafter referred to as lateral load) is applied, the rubber bush 3 is easily compressed and deformed, and the leaf spring 1 is likely to cause lateral deflection in the plate width direction (hereinafter referred to as lateral deflection) as shown by the two-dot chain line. When the stiffness in the board width direction (hereinafter referred to as lateral stiffness) is low in this way, it generally has a negative effect on steering stability and ride comfort. In order to increase the lateral rigidity, it is possible to increase the width of the leaf spring 1, but this will not only result in an increase in weight, but also cause problems such as the inability to use conventional standard products for the bracket 2.

Another problem is that the number of spring plates has recently been decreasing due to the adoption of tapered leaf springs or FRP leaf springs that can withstand much strain before breaking. 16th
As shown in the figure, when the number of spring plates is large, the hysteresis due to the friction between the plates is large as shown by the solid line A, but as the number of spring plates decreases, the hysteresis becomes small as shown by the two-dot chain line B. As a result, the damping force for vertical shooting is reduced, and vibrations are not subdued (and the spring becomes uncomfortable to ride).

[Means for solving problems]

INDUSTRIAL APPLICATION This invention is applied to the leaf|plate spring apparatus which the leaf|plate spring end part is located between the support walls of a bracket which has a pair of support walls, and is pivotably supported in the up-down direction.

The present invention is characterized in that at least one side between the side surface of the leaf spring end and the support wall is provided with a friction spacer that can slide into contact with the opposing surface.

[Effect]

According to the above configuration, for the lateral load applied to the leaf spring,
The end portion of the leaf spring can be supported by the support wall of the bracket via the friction spacer. Therefore, lateral deflection is restrained, and the lateral rigidity of the leaf spring can be increased without increasing the width of the leaf spring. Therefore, the weight of the leaf spring does not increase, and standard products can be used for the bracket and centerpiece.
This is particularly convenient for FRP leaf springs.

Moreover, with respect to vertical loads, vibration damping force can be exerted by the friction spacer slidingly contacting the opposing surface, and good vibration characteristics can be obtained at least with the number of spring plates.

〔Example〕

In one embodiment shown in FIGS. 1 and 2, a center portion 12 having a hole 11 penetrating in the width direction is formed at the end of the leaf spring 1o. This eyepiece 12 is connected to a shaft 15 through a vibration absorbing bushing 14 shown in FIG. is rotatably supported.

As the material of the vibration absorbing bushing 14, general rubber, urethane rubber, etc. are used depending on the vibration characteristics. Leaf spring 10 is FR
It is made of P (II fiber reinforced synthetic resin) or steel. Highlight part 1
2 may be formed integrally with the main body portion 10a of the leaf spring, or may be fixed to a member other than the main body portion 10a by bolts, rivets, adhesives, or the like.

The shaft 15 is provided across the support walls 16a and 16b of the bracket 16, which has a pair of left and right support walls 16a and 16b. The base 16C of the bracket 16 is mounted through the hole 17.
It is attached to the vehicle body frame, etc., using bolts, rivets, etc. (not shown) inserted into the body. The shaft 15 is attached to the support wall 16a by tightening the male threaded portion 18 with a nut 19.

16b.

A pair of friction spacers 22 are provided between both side surfaces of the eyeball portion 12 and the support walls 16a, 16b. Each friction spacer 22 is adhered to the side surface of the eyeball portion 12, and is configured to come into sliding contact with the inner surface of the supporting walls 16a, 16b facing thereto. The material of the friction spacer 22 is general rubber.

Urethane rubber, urethane elastomer, ceramic, duralumin, gunmetal, cast iron 1 alloy steel, etc., which have wear resistance, compressive strength, and a high coefficient of friction, are appropriately selected and used. In some cases, a commercially available gasket or the like may be used. In the case of urethane rubber, the rubber hardness is, for example, 80 or higher.

In this embodiment, the friction spacer 22 is fixed by adhesive.
Screws, rivets, etc. may also be used.

According to the above configuration, the lateral load applied to the eyeball portion 12 is supported by the support walls 16a and 16b via the pair of left and right friction spacers 22, so that the lateral deflection of the leaf spring 10 is made smaller than that of conventional products. be able to. In other words, the lateral rigidity can be increased without increasing the plate width. Furthermore, vibrations mainly in the vertical direction can be absorbed by the vibration absorbing bushing 14.

Furthermore, vibration damping force can be added to vibration damping of the leaf spring 10 by slidingly contacting the support walls 16a and 16b with the friction spacer 22.

In another embodiment shown in FIG. 4, an annular friction spacer 22 made of rubber, urethane elastomer, etc. is fitted into the end of the leaf spring 10, and both sides of the annular friction spacer 22 are connected to the support wall 10.
5a and 16b in sliding contact. Since the other configurations and effects are the same as those of the embodiment shown in FIG. 1, their explanations will be omitted.

Further, in the embodiment shown in FIG. 5, a cylindrical portion 24 is provided in a portion of the friction spacer 22, and this cylindrical portion 24 is fitted into the hole 11 of the eyeball portion.

FIG. 6 shows an example of the shape of the friction spacer 22 in this embodiment.

In another embodiment shown in FIG. 7, the leaf spring body 10a and the eyelet 12 are molded separately and are connected to each other via a casing 26 attached to the eyelet 12. Friction spacers 22 are then attached to both sides of casing 26 using screws 28.

In each of the embodiments shown in FIGS. 1 to 7 above, the friction spacer 22 is attached to the leaf spring 10 side.
In each of the embodiments illustrated from FIG. 8 onward, a friction spacer 22 is attached to the bracket 16 side.

That is, the example shown in FIG. 8 is the support wall 16a of the bracket 16. 16t) is provided with an adjustment screw 30 that can be moved forward and backward, and a friction spacer 22 is attached to this adjustment screw 30. The adjustment screw 30 is fixed in the desired position by a lock nut 32.

According to this embodiment, by changing the position of the adjusting screw 30, the tightening force of the friction spacer 22 can be adjusted, and therefore the damping force can be adjusted.

Furthermore, the embodiment shown in FIG.
Elastic parts 35 in the shape of leaf springs are integrally formed on the inner surfaces of b, and friction spacers 22 are provided on mutually opposing surfaces of the elastic parts 35.
is installed. The elastic portion 35 is connected to the adjusting screw 30.
This allows them to move toward and away from each other. By doing this, similarly to the eighth factor, the tightening force of the III friction spacer 22 can be adjusted, and the damping force can be adjusted.

The embodiments shown in FIGS. 10 and 11 can also vary the frictional force in the same way as described above. That is, the supporting wall 16
a, 16b with adjustment bolt 37°38 and nut 40.4
1, and by changing the tightening force, the position of the friction spacer 22 can be changed.

Further, in the embodiment shown in FIG.
Attach the slide member 45 to a, and attach the slide member 45 to
A friction spacer 22 is attached to the leaf spring side. The slide member 45 has a substantially U-shaped cross section, and its legs 458 are movably inserted into the through holes 46 formed in the support wall 16a. Then, the slide member 45 is moved by the spring 48.
is biased toward the leaf spring so that the friction spacer 22 comes into sliding contact with the side surface of the leaf spring. Therefore, the lateral rigidity and hysteresis of the leaf spring can be adjusted depending on the strength, height, etc. of the spring 48.

The embodiment shown in FIG. 13 is a box-shaped 11! By inserting the friction spacer 22 into the support walls 15a and 16b and fixing the stop plate 50 with the screw 52, the friction spacer 22 is prevented from being removed.

〔Effect of the invention〕

According to the present invention, the lateral rigidity of the leaf spring can be increased without increasing the width of the leaf spring, and the hysteresis is increased and the damping performance against vertical vibrations is improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the end of the leaf spring device showing an embodiment of the present invention, FIG. 2 is a perspective view partially showing the end of the leaf spring device in FIG. 1, and FIG. 3 is the same as that shown in FIG. FIG. 4 and FIG. 5 are perspective views showing other embodiments of the present invention, FIG. 6 is a perspective view of the friction spacer in FIG. 5, and FIG. FIGS. 88 and 9 are perspective views showing other embodiments of the invention, FIGS. 88 and 9 are plan views showing still other embodiments of the invention, and FIGS. 10 and 11 show still other embodiments of the invention. A side view, a rear view, and FIGS. 12 and 13 are perspective views showing other embodiments of the present invention, respectively. FIG. 14 is a plan view of a conventional leaf spring device, FIG. 15 is a sectional view of an end portion of the conventional leaf spring device, and FIG. 16 is a diagram showing hysteresis of the leaf spring device. 10... Leaf spring, 16... Bracket, 16a. 16b...Supporting wall, 22...Friction spacer. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 3 Figure 4] 2 Figure 5 Figure 7 Figure 8 Figure 9 Figure 1^ Figure 10 Figure 11 Figure 12 Figure 13 Figure 6c Figure 14 15 Figure 6 Figure 11 etc. -11

Claims (1)

[Scope of Claims] A leaf spring device in which a leaf spring end is positioned between the support walls of a bracket having a pair of support walls and pivotally supported to be rotatable in the vertical direction; A leaf spring device characterized in that a friction spacer is provided on at least one side between the support wall and the other side so as to be able to come into sliding contact with the other side.