JPS61157847A - Leaf spring end mounting structure - Google Patents

Abstract

PURPOSE:To improve transverse rigidity while smoothing the vertical rotation of an eye portion in an end of a leaf spring by interposing a bearing between the eye portion side of the leaf spring end and the fixed side support wall. CONSTITUTION:An leaf spring 10 is formed in the end with an eye 12 having a hole 11 extending therethrough widthwise. This eye 12 is rotatably supported by a shaft 15 through a vibration absorbing bushing 21. And between both side faces of the eye 12 and the support walls 16a, 16b of a fixed side bracket 16 are provided a pair of roller bearings 22 or rotatable plain bearings to smooth the vertical rotation of the eye 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a structure for attaching an end of a leaf spring applied to a suspension rock structure of a vehicle.

[Conventional technology]

When connecting the ends of a leaf spring to the vehicle body, conventionally, as shown in FIG. , 4b and tightened and fixed with bolts 7 and nuts 8.

[Problem that the invention seeks to solve]

However, since the rubber bushing 3 is an elastic body, its seven flange portions 3a come into contact with the support wall 4a (or 4b) to generate frictional resistance, which hinders the rotation of the eyepiece portion 2 about the shaft portion. Particularly when the vehicle turns, a load in the width direction (hereinafter referred to as lateral load) is applied to the leaf springs, which tends to further increase frictional resistance, which also affects load characteristics in the vertical direction, resulting in poor ride comfort. Deteriorate. Moreover, the deflection (hereinafter referred to as
This increases the amount of lateral deflection (referred to as lateral deflection), which can impair steering stability.

In order to increase the lateral rigidity, it is possible to increase the width of the leaf spring 1, but this not only increases the weight but also makes the bracket 4
Problems arise, such as the inability to use conventional standard products.

In addition, the rubber bushing 3 mainly operates in the thickness direction of the spring plate (hereinafter referred to as
It has the ability to improve riding comfort by absorbing minute vibrations (called vertical direction), so if you increase the hardness of the bushings 3 or use a rigid material such as metal, you can increase the lateral rigidity, but the bushings It becomes impossible to perform its original function (vibration absorption effect).

[Means for solving problems]

The present invention provides a bracket having a pair of support walls, with a leaf spring end located between the support walls, and a hole provided in either one of the support wall or the leaf spring end provided in the other. End-mounting of leaf springs for support on shafts is applied in construction.

In the present invention, a vibration absorbing bush made of an elastic material such as rubber is provided between the outer peripheral surface of the shaft portion and the inner peripheral surface of the hole, and a vibration absorbing bushing made of an elastic material such as rubber is provided between the side surface of the leaf spring end and the supporting wall. is characterized in that it is provided with a sliding rotation bearing or a rolling rotation bearing that can rotatably support the leaf spring end and support lateral loads.

[Effect]

According to the above configuration, since the vibration absorbing bushing made of an elastic material is interposed between the shaft portion and the hole portion, the eye bushing can exert its original vibration absorbing effect.

Moreover, the lateral load can be supported by the support wall of the bracket by means of the rotary bearing. As a result, the frictional resistance seen in conventional rubber bushings is significantly reduced, and the vertical rotation of the eyepiece becomes smoother, improving riding comfort.

Moreover, since the rotation bearing can restrain the lateral displacement of the end portion of the leaf spring, the lateral rigidity of the leaf spring can be increased without increasing the width of the leaf spring.

Therefore, there is no increase in weight, and standard products can be used for the brackets and eyepieces, especially for FRP If
This is convenient for J leaf springs.

[Example 1] At the end of the leaf spring 10 shown in FIG. 1, a center portion 12 having a hole 11 penetrating in the width direction is formed. This eyepiece portion 12 is rotatably supported by a shaft portion 15 via a vibration absorbing bushing 21 which will be described below. leaf spring 10
is made of FRP (fiber reinforced synthetic resin) or steel.

The shaft portion 15 is provided across the support walls 16a, 16b of the bracket 16, which has a pair of left and right support walls 16a, 16b. The base 16c of the bracket 16 is fixed using a bolt, rivet, etc. (not shown) inserted through the hole 17.
It can be attached to the vehicle body frame, etc. The shaft portion 15 is attached to the support wall 16a by tightening the male screw portion 18 with a nut 19.

16b.

The vibration absorbing bushing 21 is formed between the outer peripheral surface of the shaft portion 15 and the hole portion 11.
and the inner circumferential surface of the The material of the vibration absorbing bushing 21 may be general rubber, urethane rubber, packing material, etc. depending on the vibration characteristics.

A pair of rolling bearings 22 is provided between both side surfaces of the eyeball portion 12 and the support walls 16a, 16b.

Each of the rolling bearings 22 is a thrust bearing that can be rotatably supported around the shaft portion 15 of the eyeball portion 12 and can support a lateral load.

According to the above configuration, the eyeball portion 12 can be rotatably supported by the support walls 16a and 16b by the pair of left and right rolling bearings 22, so even if a lateral load is applied, the eyeball portion cannot rotate about the shaft portion 15. It is much smoother than conventional rubber bushings. Moreover, since the lateral displacement of the eyepiece 12 is restrained by the support walls 16a and 16b via the rotary bearing 22, the lateral deflection of the leaf spring 10 can be made smaller than that of conventional products. In other words, the lateral rigidity can be increased without increasing the plate width. Moreover, since vibrations mainly in the vertical direction can be absorbed by the vibration absorbing bushing 21,
The spring provides a comfortable ride.

Note that the rolling bearing 22 may be formed integrally with the vibration absorbing bushing 21 by providing seven flange portions. In this case, the rolling bearing 22 and an elastic body (preferably made of the same material as the vibration absorbing bushing) may be integrally molded so as not to impair the movement of the rolling bearing and to prevent the rollers from coming off.

[Embodiment 2] In the embodiment shown in FIG. 2, the structure of the rotary bearing 22 is
This is slightly different from the embodiment. That is, the supporting walls 16a, 16
An annular groove 2 into which a ball 26 is inserted is formed in a pair of left and right ball receiving plates 25 attached to b and on both sides of the eyeball part 12.
7.28 so that the eyeball part 12 can rotate around the shaft part 15. Since the other configurations and effects are the same as those of the first embodiment, common parts are given the same reference numerals and explanations will be omitted.

[Embodiment 3] In the third embodiment shown in FIG. 3, a sliding rotation bearing 30 with a ring 31 is used instead of a rolling rotation bearing. In this case, the vibration absorbing bushing 21 is attached to the shaft portion 32.
and a hole 36 formed in the ring receiving plate 33. Further, the ring 31 fits into an annular groove 34 formed in the ring receiving plate 33. In this way, the eyeball part 12 can freely rotate around the shaft part 32, and its displacement in the lateral direction is restrained. Note that the specific shapes of the vibration absorbing bushing 21, the sliding rotation bearing 30, etc. are not limited to the embodiments, and can be modified as appropriate without departing from the gist of the present invention.

[Embodiment 4] When the leaf spring is relatively small and the centerpiece 12 is small, a ball 4o or a corner member is inserted into a depression formed in the center of the centerpiece 12, as shown in FIG. Rotating bearing 22
It is preferable that the structure is as follows. In this case, vibration absorbing bushing 2
1 is the outer circumferential surface of the shaft portion 42 formed at the end of the leaf spring and the support wall 16a.

It is interposed between the inner peripheral surface of the hole 44 provided in the hole 16b.

According to the fourth embodiment, the end portion of the leaf spring can be made relatively compact, and the lateral rigidity can be improved and the vibration absorption effect can be obtained as in the first to third embodiments.

〔Effect of the invention〕

According to the present invention, even when a lateral load or the like is applied, the center portion rotates smoothly, and the lateral rigidity can be increased without increasing the board width, and the vibration absorption effect can also be exhibited.

[Brief explanation of drawings]

1 to 4 are sectional views showing M1 to 4th embodiments of the present invention, respectively, and FIG. 5 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 10... Leaf spring, 11... Hole part, 12... Eyepiece part, 15... Shaft part, 16... Bracket, 16a, 1
6b...Supporting wall, 21...Vibration absorbing bushing, 22
... Rolling rotation bearing, 30 ... Sliding rotation bearing, 3
2... Shaft part, 36... Hole part, 42... Shaft part, 44
...A hole. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] A leaf spring end is located between the support walls of a bracket having a pair of support walls, and a hole provided in either one of the support wall and the leaf spring end is provided in the other. In the end-mounting structure of the leaf spring, which is supported by the shaft part, a vibration-absorbing bush made of an elastic material is provided between the outer circumferential surface of the shaft part and the inner peripheral surface of the hole, and the end part of the leaf spring is A sliding rotation bearing or a rolling rotation bearing capable of rotatably supporting the end of the leaf spring and supporting the load in the width direction of the spring plate is provided between the side surface of the spring plate and the support wall. End-mounted structure for leaf springs.