JP2000103213A - Spring seat for leaf spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new spring seat for a leaf spring being lightweight and being excellent in production efficiency. SOLUTION: The seat surface abutting to a leaf spring side, side connecting surfaces 3, 3 contacting with the wheel shaft side and front/rear connecting surfaces 4, 4 positioned between the side connecting surfaces 3, 3 are integrally molded by folding up a single plate material 9, and the end parts of the front/ rear connecting surfaces 4, 4 are bent to be superposed on the end parts of the side connecting surfaces 3, 3. Thus, production efficiency is improved since work for welding a member later on is obviated, and weight can be reduced since stress can be relieved without thicknening a plate thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leaf spring spring seat interposed between an axle such as a truck and a leaf spring.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, an axle a of a truck or the like generally has a leaf spring (leaf spring) b and a shock absorber c fastened to a chassis frame f.
Supported by a suspension system consisting of

[0003] Specifically, as shown in the figure, a leaf spring b is arranged via a spring seat d below an axle a having a circular cross section, and the axle a and the leaf spring b
Are connected by a pair of U-shaped bolts e, e to support the axle a, and allow the movement thereof by bending of the leaf spring b and expansion and contraction of the shock absorber c.

The spring seat d interposed between the axle a and the leaf spring b is shown in FIGS.
As shown in FIG. 5, a square seat surface g abutting on the leaf spring b side, and a pair of side connecting surfaces h, h extending perpendicularly to the axle direction from a pair of edges perpendicular to the axle of the seat surface g, A pair of front and rear connecting surfaces i, i each having an inverted U shape extending at an acute angle from a pair of edges parallel to the seat surface g, and having an axle a having a circular cross section;
It has a function of transmitting a load to and from the leaf spring b having a planar cross section.

FIG. 7 shows a state in which the seat surface g which contacts the leaf spring b side is up.

[0006]

In this spring seat d, the seat surface g and the side connecting surfaces h, h have a continuous and integral structure, respectively, but the front and rear connecting surfaces i, i are composed of separate members. Have been. And these three
In order to form the two plate members into an integral structure, it is usually formed into a drawn shape by a press machine. However, forming such that the side connection surfaces h and h make an acute angle with respect to the sheet surface g as in the present spring seat is conventionally performed. Because it is physically impossible due to the molding method,
After the sheet surface g and the side connection surfaces h, h are formed as described above, the front and rear connection surfaces i, i must be welded to the molded product.

[0007] However, this welding operation has problems such as fumes, spatters and adhesion to the work, which may cause molding defects, and may cause a time difference from press working. Since it cannot be performed continuously, stock as an intermediate product has been generated after press working. For this reason, it is necessary to manage the stock of each intermediate product, secure a storage location, and transport the product to a welding work site, which is the next process, which requires a great deal of man-hours and cost. In addition, welding work is a completely different process from the press method, and performing this welding operation not only significantly increases the cost for that process, but also requires a single factory or single company due to differences in the method of construction. In many cases, integrated production was impossible, and this was a major factor that hindered rationality. It is also important to control the quality of the welding work, and in order to supply stable and reliable products to the market, setting and maintaining welding conditions and inspecting products after welding require a lot of man-hours and costs. Was. Also, the welding work requires an assembling jig to improve and stabilize the mutual positional accuracy of the parts to be assembled, and requires a great deal of cost and time to manufacture the jig and correct it due to abrasion. This has been a factor in prolonging the production time, and has also led to a decrease in productivity, such as production adjustments for fixing jigs. As described above, there are many problems in a conventional structure processed by a different method, and it has been difficult to achieve an improvement in production efficiency and a reduction in manufacturing cost.

Further, such a spring seat d is used by welding the end edges of the side connecting surfaces h, h and the front and rear connecting surfaces i, i to the outer periphery of the axle a. This means that the entire circumference has been welded, and the spring seat d is a substantially complete box-shaped rigid body. For this reason, excessive stress is applied to the welded portion of the spring seat d itself and the welded portion of the spring seat d and the axle a, which may cause cracks. It was necessary to increase the plate thickness.

However, when the thickness of the entire spring seat d is increased, the weight is increased and the material cost is increased.

Accordingly, the present invention has been devised in order to effectively solve such a problem, and an object thereof is to provide a novel spring seat for a leaf spring which is lightweight and excellent in production efficiency. is there.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a square seat surface provided between an axle and a leaf spring and abutting on the leaf spring side, and an axle of the seat surface. A pair of side connecting surfaces extending in the axle direction from a pair of edges perpendicular to the pair of front and rear connecting surfaces forming an inverted C shape that extend at an acute angle from a pair of edges parallel to the axle of the seat surface. In the spring seat for a leaf spring, the sheet surface, the side connection surface, and the front and rear connection surface are integrally formed by folding a single plate material, and the end of the front and rear connection surface is bent to form the side connection. By superimposing on the end of the surface, the structure can be obtained without stress relaxation.

That is, the bending line at the time of forming a single plate material is formed by devising a bending line so that the front and rear connecting surfaces have the required acute angle, and the whole is integrally formed by folding three-dimensionally. Eliminating irrationalities such as an increase in the number of work steps due to such welding work, furthermore, all the manufacturing processes of the spring seat can be performed by press working as the same method, and transfer, that is, The production efficiency can be greatly improved, for example, the entire production process can be supplemented with one stroke of the press machine.

In this integral molding, the ends of the front and rear connection surfaces are bent and overlapped with the ends of the side connection surfaces, so that the front end edges of the side connection surface and the front and rear connection surfaces are welded to the outer periphery of the axle. In addition, each of these welds will be connected via the overlapped portion, and it is possible to reduce the stress on each of the welds, without increasing the thickness of the entire spring seat, Lightening can be achieved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a spring seat 1 for a leaf spring according to the present invention (hereinafter referred to as a spring seat 1).
FIG. 2 is a perspective view showing a state in which the spring seat 1 is mounted on an axle a.

As shown in FIG.
Is a square seat surface 2 abutting on the leaf spring b side, and a pair of side connecting surfaces 3, 3 extending perpendicularly to the axle a direction from a pair of edges of the seat surface 2 perpendicular to the axle a. And a pair of front and rear connecting surfaces 4 and 4 each having an inverted U shape extending at an acute angle from a pair of edges parallel to the axle a of the seat surface 2.

The sheet surface 2, the side connecting surfaces 3, 3, the front and rear connecting surfaces 4, 4 are formed integrally by three-dimensionally folding a single plate material 9 in the same direction. The configuration is as follows.

More specifically, the side connection surfaces 3, 3
Are formed continuously in the direction of the axle a vertically from a pair of edges perpendicular to the axle a of the seat surface 2, and the front and rear connecting surfaces 4 are parallel to the axle a of the seat surface 2. The axle a has a structure formed continuously toward the center of the axle at an acute angle from the edge.

Also, both sides of the front and rear connection surfaces 4 and 4 are bent toward the end portions of the side connection surfaces 3 and 3 so that the overlapping surfaces 5, 5, 5 and 5 are connected to the ends of the side connection surfaces 3 and 3 respectively. The parts are superimposed on each other.

Each of the side connecting surfaces 3 and 3 is formed with a semicircular cut 3a. As shown in FIG. 2, the edges of the cuts 3a and 3a and the front and rear connecting surfaces 4 and 3 are formed. 4 are in contact with the axle a and are welded.

In the spring seat 1 of the present invention configured as described above, since one plate member 9 is used and the whole is a continuous and integral structure, a plurality of parts are separately provided as in the conventional case. The work of assembling by welding and assembling by welding is not required, and the manufacture becomes easy.

Further, through the overlapping surfaces 5, 5, 5, 5, the stress at each welded portion with the axle a can be relaxed, and the weight can be reduced.

Next, a method of forming the spring seat 1 of the present invention having such a structure will be described.

First, a steel plate having a uniform thickness is prepared, and a plate material 9 having a shape as shown in FIG. 3 is formed by a punching machine.

As shown in the figure, the plate member 9 has a semi-circular notch 3a, a semi-circular cut 3a formed in a mirror shape on the upper and lower sides of the rectangular sheet surface 2 located at the center portion. , 3 are formed continuously, and the sheet surface 2
, Front and rear connection surfaces 4 and 4 extending in the left-right direction in the figure are formed continuously. In addition, the upper and lower connecting surfaces 4 and 4 in the figure have wedge-shaped overlapping surfaces 5 and 4, respectively.
5, 5, 5 are formed continuously.

Then, the plate member 9 having such a shape is set on a press machine, and the boundary line S between the components is folded in a valley and a mountain, respectively, and three-dimensionally deformed as shown in FIG. After this, the boundary line S between these components is further folded by a press to obtain the spring seat 1 of the present invention as shown in FIG.

Specifically, in FIG. 3, dashed lines S1 and S1, which are boundaries between the sheet surface 2 and the side connection surfaces 3 and 3, are shown.
The two-dot broken lines S2 and S2, which are the boundaries between the sheet surface 2 and the front and rear connection surfaces 4 and 4, are mountain-folded in the same direction, respectively, and the boundary between the front and rear connection surfaces 4 and 4 and the overlapping surfaces 5, 5, 5, 5 Dotted line S
3, S3, S3, and S3 are each valley-folded, and solid lines S4, S4, S4, and S4, which are boundaries between the overlapping surfaces 5, 5, 5, 5 and the side connection surfaces 3, 3, are each mountain-folded. After press forming until the two-dot broken lines S2 and S2 are folded at right angles, as shown in FIG. 4B, a force is applied from both sides of the side connection surfaces 3 and 3 to apply the force to the sheet surface 2 and the side connection surface. A finished product can be obtained by bending the boundary lines S1 and S1 with 3, 3 at right angles.

In this case, the solid lines S4, S4, S4
If the bending angle of the two-dot broken lines S2 and S2 at the time of completion is set to be the acute angle required by the front and rear connection surfaces 4 and 4, the required shape of the spring seat 1 will be the side connection. Forming by applying force from both sides of the surfaces 3, 3 can be obtained with geometrical necessity. Thus, even in a structure in which the pair of front and rear connection surfaces 4 and 4 like the present spring seat 1 are bent at an acute angle and form an inverted C shape, they can be easily integrally formed by the press machine.

Accordingly, it is not necessary to weld the front and rear connecting surfaces later as in the related art, so that the production efficiency is improved, and
Through the overlapping surfaces 5, 5, 5, 5, the stress in each welded portion with the axle a can be relaxed, and the weight can be reduced.

[0030]

In summary, according to the present invention, the following excellent effects can be exhibited.

(1) Since one plate is formed by folding three-dimensionally, production efficiency is improved as compared with a case where a plurality of members are combined.

(2) Since the two end portions of the support member are overlapped when the plate material is folded and formed, the stress of the axle and the welded portion can be easily reduced.

(3) As a result, it is not necessary to increase the thickness of the entire plate, and the overall weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a leaf spring spring seat according to the present invention.

FIG. 2 is a perspective view showing a state where a leaf spring spring seat according to the present invention is attached to an axle side.

FIG. 3 is a developed view of a leaf spring spring seat according to the present invention.

FIG. 4A is a perspective view showing a state where the cross member according to the present invention is folded and formed. (B) shows FIG.
(A) It is an arrow A view in the middle A direction.

FIG. 5 is a perspective view showing a state in which a conventional leaf spring spring seat is attached.

FIG. 6 is a side view showing an attached state of a conventional leaf spring spring seat.

FIG. 7 is a perspective view showing a conventional spring seat for a leaf spring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spring seat 2 Seat surface 3 Side connection surface 4 Front and rear connection surface 5 Overlapping surface 9 Plate material a Axle b Leaf spring

Claims (1)

[Claims] 1. A square seat surface provided between an axle and a leaf spring and abutting on the leaf spring side, and a pair of edges extending in the axle direction from a pair of edges perpendicular to the axle of the seat surface. In a leaf spring spring seat having a side connection surface and a pair of front and rear connection surfaces having an inverted C shape extending at an acute angle from a pair of edges parallel to the axle of the seat surface, the seat surface and A structure in which the side connection surface and the front and rear connection surface are integrally formed by folding a single plate material, and the end of the front and rear connection surface is bent and overlapped with the end of the side connection surface, so that stress can be alleviated. A spring seat for a leaf spring, characterized in that: