JPS62160907A - Vehicular suspension device - Google Patents

Abstract

PURPOSE:To improve durability of a leaf spring group after the second leaf spring, by constituting a device such that it contains the leaf spring group after the second leaf spring in an axle housing while arranges the first leaf spring outside the axle housing to be tightened by its mounting, in case of the laminated spring type suspension device. CONSTITUTION:A suspension device places the first leaf spring 1 to be mounted onto the upper surface of a bottom part 32 of a hollow axle housing 3 of squared shape with one end open while an upper pad 4 to be mounted onto the upper surface of the first leaf spring 1. While the device contains a leaf spring group 2 after the second leaf spring in the axle housing 3, interposing spacers 7, 8 and arranging an axle tightening plate 9. And the device, which mounts said axle housing 3 to an axle by U-bolts 5 and nuts 50, mounts the first leaf spring 1 to the axle while tightens the group 2 after the second leaf spring by tightening force being prevented from increasing to a predetermined value or more. By this constitution, the device, which prevents the leaf spring group from generating fretting and corrosion, improves durability of the leaf spring group.

Description

[Detailed description of the invention] Production of 1 The present invention relates to a vehicle suspension system.

BACKGROUND OF THE INVENTION In vehicle suspension systems commonly used in the past, the stacked leaf springs are No. 1, 1-leaf, and No. 1 leaf springs.

A group of several leaves below the Z leaf are integrally fixed to the axle via an upper pad with υ bolts. In this way, the stacked leaf spring is No. 1, and the leaf is No. 2.
Since it is strongly attached to the axle along with the leaf groups below the leaf, a strong tightening torque is required for its attachment, and as a result, a strong compressive force is applied to the tightening part of each leaf of the leaf spring. It will work.

However, in a vehicle suspension system using stacked leaf springs having such a configuration, when the stacked leaf springs used are displaced up and down while the vehicle is running, the tightening portions of the used leaf springs may be damaged. A slight slippage occurs, and a phenomenon of fretting corrosion occurs between the side surfaces of each leaf and the circumferential surface of the U-bolt at this tightening portion. When this phenomenon of fretting corrosion occurs, fatigue cracks occur at that location, which is the main cause of a significant decrease in durability of each leaf. In particular, if the leaf group of No. 2 leaves or less is made of reinforced resin springs with reinforcing materials such as carbon fiber or glass fiber,
The decrease in durability of the leaf group below the leaf becomes even more remarkable.

■ tries to.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to obtain a novel vehicle suspension system that can solve the above-mentioned problems with the stacked leaf springs used in conventionally known vehicle suspension systems. .

In order to achieve this object, the present invention is as follows:
As shown in the figure, in a vehicle suspension system composed of a stacked leaf spring made of several sheets of glue 71, 2 and an axle 6,
No. 1 leaf 1 of the stacked leaf spring is placed on the top or bottom surface of the outside of the hollow box-shaped axle box 3, and a group 2 of No. 2 leaves or less leaves is placed inside the axle box 3 as appropriate. This vehicle suspension is mounted on the axle 6 while applying an appropriate tightening force to the No. 1 leaf 1 while accommodating the axle box 3 under a certain tightening force. The device is characterized by:

Function With this configuration, the No. 1 leaf is attached to the axle 6 via the axle box 3, but the leaf group 2 of No. 2 leaves and below is attached to the inside of the axle box 3 under an appropriate tightening force. They are not subjected to the strong clamping forces that No. 19-71 is subjected to, thus making it possible to significantly extend the life of these leaves.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to FIGS. 1 to 7 of the accompanying drawings showing embodiments thereof.

First, as shown in FIGS. 1 and 2, in the present invention,
The leaf of the stacked leaf spring is No. It is divided into 1 leaf 1 and a group Z of No. 2 leaves or less. And no
.

As shown in FIG. 3, the leaf 1 is the bottom of a hollow axle box 3 having a certain length and having an opening 3 □ at the bottom and a substantially U-shaped cross-sectional profile. The upper pad 4 is placed on the upper surface of this No. 32, and the upper pad 4 is placed on the upper surface of the leaf 1.
Tighten the No. 1 leaf 1 to the axle 6 through the axle box 3 and upper pad 4 by tightening the nut 5° screwed into the lower part of the axle 6 using the pair of U bolts 5.
In this way, the longitudinal movement of the axle 6 due to the longitudinal load is mainly controlled by this No'.

1 leaf 1 to support it. On the other hand, inside the hollow part inside this axle box 3, a third
As shown in FIG. However, No, for group 2 with 2 leaves or less,
To prevent a tightening force exceeding an appropriately determined tightening force from being applied. That is, these No. 2 leaf groups 2 or less are inserted into the axle box 3 through spaces 7 and 8 above and below, respectively, as shown in FIGS. 3 and 4. Further, an axle tightening plate 9 is placed below the lower spacer 8, and then tightened to the axle 6 with U bolts 5. This axle tightening plate 9 fulfills its original role of applying an appropriate tightening force to the leaf group 2 of No. 2 leaves or less through the spacer 8 when the U bolt 5 is tightened. At the same time, positioning with respect to the axle 6 is also achieved by engagement between the center bolt 10 integrally formed at the center of the lower surface and a recess 11 formed to have a cross section corresponding to the upper surface of the axle 6. It's useful.

Next, attach the axle box 3 and the axle tightening plate 9 using the U bolts 5.
The appropriate tightening force applied between the bottom of the axle box 3 and the top surface of the axle clamping plate 9 for the group 2 of No. 2 leaves or less in the bearing box 3 is as follows: It is set as follows. That is, No,
Plate thickness H of group 2 of leaves of 2 leaves or less and each spacer 7
．． The thickness of the plate 8 is predetermined, and when these are mutually tightened by the υ bolt 5 between the bottom inner surface of the axle box 3 and the top surface of the axle clamping plate 9, the overall height lIo is , the thickness of each member ■ and the deflection δ that will give the initially planned tightening force when it becomes equal to the internal height of the hollow axle box 3 is given as (H + 2h) - HO. 11 can be determined. In addition, in FIGS. 1 and 3, the reference numeral 12 is
No. 1 The center bolt for centering the leaf 1 on the bottom 32 of the axle box 3 is not shown.

The stacked leaf spring in the vehicle suspension system according to the present invention has the above-mentioned basic configuration, but now we will show examples of typical members that can be considered when attaching this vehicle suspension system to the frame of a vehicle body. , as shown in FIGS. 5 to 8. In other words, the fastening methods shown in each figure are as follows:
It is as follows.

■Figure 5 Upper pad 4-NO, leaf group 2- with 2 leaves or less
Axle box 3-No, 1 leaf 1-axle 6-fastening method upper pad 4-No, leaf 1-axle box 3-No, leaf group of 2 leaves or less 2-axle 6-fastening method axle 6-No,
Leaf 1 - Axle box 3 - No. Leaf group 2 with 2 leaves or less
- Upper pad 4 - fastening method Axle 6 - No., leaf group 2 of 2 leaves or less - axle box 3 - No., 1 leaf 1 - upper pad 4 - fastening method, etc. In each of these countries, the reference numeral 20 indicates a chassis frame, and 21 indicates a support point.

Since the present invention has the structure and operation as described above, the leaf group 2 of No. 2 leaves or less is housed inside the axle box 3, and the leaf group 2 of No. 1 leaf 1 is housed inside the axle box 3. It is possible to receive the optimum tightening force regardless of the applied tightening force, and it is possible to effectively prevent fretting corrosion from occurring in each leaf of group 2 of No. 2 leaves or less. This effect is particularly noticeable when these leaves are made of reinforced resin such as carbon fiber or glass fiber, and the axle box 3 prevents the leaves 7 and group 2 of No. 2 leaves or less from being strongly tightened. Therefore, there is less solidification of the U-bolt 5 due to this tightening force, and therefore, compared to conventionally known vehicle suspension systems, it is possible to use a stacked leaf spring with a softer spring constant, which provides various excellent effects. It is.

[Brief explanation of drawings]

FIG. 1 is an overall front view showing one embodiment of the present invention, and FIG.
The figure is a bottom view, FIG. 3 is an enlarged vertical sectional view of the axle box, and FIG. 4 is an enlarged plan view of the axle box.
5 to 8 are front views showing typical arrangements of various vehicle suspension system systems for stacked leaf springs according to the present invention. 1...No, 1 leaf, 2...No, leaf group of 2 leaves or less, 3...axle box, 4...upper pad, 5...U bolt, 6... axle, 7 .8... Spacer, 9... Axle tightening plate.

Claims (1)

[Scope of Claims] 1. In a vehicle suspension system composed of a stacked leaf spring consisting of several leaves and an axle, No. 1 of the stacked leaf spring. 1
A leaf is placed on the top or bottom surface of the outside of the hollow box-shaped axle box, and No. A group of two or fewer leaves is housed inside an axle box under an appropriate tightening force, and this axle box is designated as No. No. 1 with a leaf group of 2 leaves or less accommodated.
A vehicle suspension system characterized in that a leaf is attached to an axle while applying an appropriate tightening force to one leaf. 2.No. 2. The vehicle suspension system according to claim 1, wherein one leaf is fastened to the axle via an upper pad in the axle box. 3. The axle box is box-shaped with a substantially rectangular cross section, one longitudinal side of which is open, and a tightening plate is disposed between this opening and the axle. Vehicle suspension system according to scope 1 or 2. 4. The vehicle suspension system according to claim 3, wherein spacers made of an elastic material are arranged at the bottom of the axle box and at the top of the clamping plate, respectively.