JP4050832B2 - Spring seat for leaf spring - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leaf seat for a leaf spring interposed between an axle of a truck or the like and a leaf spring.
[0002]
[Prior art]
As shown in FIGS. 5 and 6, the axle a of a truck or the like is generally supported via a suspension device including a leaf spring (plate spring) b fastened to a chassis frame f and a shock absorber c.
[0003]
Specifically, as shown in the drawing, a leaf spring b is arranged on a lower part of an axle a having a circular cross section via a spring seat d, and the axle a and the leaf spring b are connected by a pair of U-shaped bolts e and e. By connecting, the axle shaft a is supported, and its movement is allowed by bending of the leaf spring b and expansion / contraction of the shock absorber c.
[0004]
Further, as shown in FIGS. 6 and 7, the spring seat d interposed between the axle shaft a and the leaf spring b includes a rectangular seat surface g that abuts on the leaf spring b side, and the seat surface g. A pair of side connecting surfaces h, h extending perpendicularly to the axle direction from a pair of edges perpendicular to the axle, and an inverted C shape extending from the pair of edges parallel to the seat surface g at an acute angle. It is comprised from a pair of front-and-rear connection surfaces i and i, and has the function which transmits a load mutually between the axle shaft a with a circular cross section, and the leaf spring b with a flat cross section.
[0005]
FIG. 7 shows a state in which the sheet surface g contacting the leaf spring b side is faced up.
[0006]
[Problems to be solved by the invention]
By the way, the spring seat d has an integral structure in which the seat surface g and the side connection surfaces h and h are continuous, but the front and rear connection surfaces i and i are formed of separate members. And in order to make these three plate materials into an integral structure, it is usually formed into a drawn shape by a press machine, but the side connecting surfaces h, h form an acute angle with respect to the seat surface g as in this spring seat. Since molding is physically impossible in the conventional molding method, the two-part configuration as described above is used. After the sheet surface g and the side coupling surfaces h and h are molded, the front and rear coupling surfaces i and i are formed on the molded product. Had to be welded.
[0007]
However, this welding work usually has problems such as forming defects due to fume, spatter and adhesion to the workpiece, or a time difference with the press work, and at the same time or continuously with the press work. Since this was not possible, there was an inventory as an intermediate product after pressing. For this reason, management of each intermediate product inventory, securing of a storage place, conveyance to the welding work place which is the next process, and the like are necessary, and a great amount of man-hours and costs are required. Furthermore, the welding work is a completely different process from the press method. By performing this welding work, not only a significant cost increase for the process, but also due to differences in the construction method, a single factory or a single company. In many cases, integrated manufacturing is impossible, which is a major factor that hinders rationality. In addition, quality control is also important for welding operations, and it takes a great deal of man-hours and costs such as setting and maintaining welding conditions and product inspection after welding in order to supply stable and reliable products to the market. Was. Also, the welding work requires an assembly jig to improve and stabilize the mutual positional accuracy of the parts to be assembled, and it takes a great deal of cost and time for jig fabrication and correction due to wear. It has become a factor of productivity deterioration such as a factor of prolonged or production adjustment for jig correction. Thus, there are many problems in the structure processed by different methods as in the prior art, and it has been difficult to achieve improvement in production efficiency and reduction in production cost.
[0008]
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 shaft a. This spring seat d becomes a substantially perfect box-shaped rigid body. For this reason, excessive stress is applied to the welded portion of the spring seat d itself or the welded portion of the spring seat d and the axle shaft a, causing cracks. Therefore, the main purpose of the leg length of these welded portions is to extend the length of the entire spring seat d. It was necessary to increase the plate thickness.
[0009]
However, if the plate thickness of the entire spring seat d is increased, the weight increases and the material cost increases.
[0010]
Therefore, the present invention has been devised to effectively solve such problems, and an object of the present invention is to provide a novel leaf spring spring sheet that is lightweight and excellent in production efficiency.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention comprises a rectangular seat surface that is provided between an axle and a leaf spring and abuts on the leaf spring side, and a pair of edges that are orthogonal to the axle of the seat surface. A spring seat for a leaf spring comprising a pair of side connecting surfaces extending in the axle direction and a pair of front and rear connecting surfaces extending in an acute angle from a pair of edges parallel to the axle of the seat surface. The sheet surface, the side connection surface, and the front and rear connection surfaces are integrally formed by folding a single plate, and the end portions of the front and rear connection surfaces are folded and overlapped with the end portions of the side connection surfaces. In this structure, stress relaxation is possible.
[0012]
In other words, the welding line as in the past is formed by contriving and setting the folding line at the time of molding so that one plate material has an acute angle shape required for the front and rear connection surfaces, and three-dimensionally folding and integrally forming the whole It is possible to eliminate irrationality such as an increase in work process due to work, and to perform the entire manufacturing process of the spring seat by press working as the same construction method. Production efficiency can be greatly improved, such as making it possible to supplement the entire manufacturing process with one stroke.
[0013]
In addition, when this integral molding is performed, the ends of the front and rear connecting surfaces are folded and overlapped with the end portions of the side connecting surfaces so that the side connecting surfaces and the front end edges of the front and rear connecting surfaces are welded to the outer periphery of the axle. Since the welded parts of the springs are connected to each other through the overlapped part, the stress on the welded parts can be relieved, so the weight of the spring seat can be reduced without increasing the thickness. Can be achieved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.
[0015]
FIG. 1 is a perspective view showing an embodiment of a spring seat 1 for leaf springs (hereinafter referred to as spring seat 1) according to the present invention, and FIG. 2 is a perspective view showing a state in which the spring seat 1 is attached to an axle a. It is.
[0016]
As shown in the figure, the spring seat 1 is perpendicular to the axle a direction from a rectangular seat surface 2 that contacts the leaf spring b and the pair of edges perpendicular to the axle a of the seat surface 2. A pair of side connecting surfaces 3 and 3 that extend, and a pair of front and rear connecting surfaces 4 and 4 that form an inverted C shape extending at an acute angle from a pair of edges parallel to the axle a of the seat surface 2. ing.
[0017]
The seat surface 2, the side connection surfaces 3, 3, and the front and rear connection surfaces 4, 4 are integrally formed by three-dimensionally folding a single plate material 9 in the same direction, and both are continuous with each other. It has become.
[0018]
More specifically, the side connecting surfaces 3 and 3 are continuously formed in the direction of the axle a perpendicularly from a pair of edges perpendicular to the axle a of the seat surface 2, and the front and rear connecting surfaces 4 and 4 are The seat surface 2 has a structure formed continuously at an acute angle from a pair of edges parallel to the axle a of the axle 2 toward the center of the axle a.
[0019]
Further, 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, and the overlapping surfaces 5, 5, 5 and 5 are respectively formed at the end portions of the side connection surfaces 3 and 3. It is designed to be superimposed.
[0020]
The side connection surfaces 3 and 3 are formed with semicircular cuts 3a and 3a, respectively, and as shown in FIG. 2, the edges of the cuts 3a and 3a and the edges of the front and rear connection surfaces 4 and 4 are formed. The portions are in contact with the axle shaft a and are each welded.
[0021]
In the spring seat 1 of the present invention configured as described above, since a single plate material 9 is used and the whole is a continuous and integrated structure, a plurality of parts are separately manufactured as in the prior art. This eliminates the need for welding and assembling, and facilitates production.
[0022]
Moreover, the stress reduction of each welding part with the axle shaft a is attained through the superposition | polymerization surface 5,5,5,5, and weight reduction can be achieved.
[0023]
Next, a method for forming the spring seat 1 of the present invention having such a structure will be described.
[0024]
First, a steel plate having a uniform plate thickness is prepared, and a plate 9 having a shape as shown in FIG. 3 is formed by a punching machine.
[0025]
As shown in the drawing, this plate member 9 has side connecting surfaces 3 and 3 in which semicircular cuts 3a and 3a are formed in a mirror shape on the upper and lower sides of the rectangular sheet surface 2 located in the center. Further, front and rear connecting surfaces 4 and 4 extending in the left-right direction in the figure are continuously formed at both ends of the sheet surface 2. In addition, wedge-shaped overlapping surfaces 5, 5, 5, and 5 are continuously formed above and below the front and rear connecting surfaces 4 and 4, respectively.
[0026]
Then, after the plate material 9 having such a shape is installed in a press machine, the boundary line S between the constituent members is folded in a valley and a mountain, respectively, and three-dimensionally deformed as shown in FIG. Furthermore, the spring seat 1 of the present invention as shown in FIG. 1 is obtained by folding the boundary line S between these constituent members with a press.
[0027]
Specifically, in FIG. 3, one-dot broken lines S1 and S1 that are boundary lines between the seat surface 2 and the side connection surfaces 3 and 3, and two points that are boundary lines between the seat surface 2 and the front and rear connection surfaces 4 and 4 The broken lines S2 and S2 are respectively folded in the same direction, and dotted lines S3, S3, S3 and S3 which are boundaries between the front and rear connecting surfaces 4 and 4 and the overlapping surfaces 5, 5, 5 and 5 are respectively valley folded, The solid lines S4, S4, S4, and S4, which are boundaries between the overlapping surfaces 5, 5, 5, and 5 and the side connecting surfaces 3 and 3, are folded in a mountain, and the two-dot broken lines S2 and S2 are folded at a right angle. 4B, the boundary lines S1 and S1 between the sheet surface 2 and the side connection surfaces 3 and 3 are bent at a right angle by applying force from both sides of the side connection surfaces 3 and 3, as shown in FIG. A finished product is obtained.
[0028]
At this time, the solid lines S4, S4, S4, S4 should be set so that the bending angle of the two-dot broken lines S2, S2 is the acute angle required for the front and rear connecting surfaces 4, 4 when completed. The required shape of the spring seat 1 can be obtained with geometric necessity by applying force from both sides of the side connecting surfaces 3 and 3. As a result, even in a structure in which the pair of front and rear connecting surfaces 4 and 4 such as the spring seat 1 are bent at an acute angle and have an inverted C shape, they can be easily integrally formed with a press machine.
[0029]
Therefore, it is not necessary to weld the front and rear connecting surfaces later as in the conventional case, and the production efficiency is improved, and the stress of each welded portion with the axle shaft a can be relaxed through the overlapping surfaces 5, 5, 5, and 5. Thus, weight reduction can be achieved.
[0030]
【The invention's effect】
In short, according to the present invention, the following excellent effects can be exhibited.
[0031]
(1) Since a single plate material is three-dimensionally folded and formed, the production efficiency is improved as compared with a case where a plurality of members are combined.
[0032]
(2) Since the two end portions of the support member are stacked at the time of folding the plate material, the stress of the axle and the welded portion can be easily relaxed.
[0033]
(3) This eliminates the need to increase the overall plate thickness, and achieves overall weight reduction.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a leaf seat for a leaf spring according to the present invention.
FIG. 2 is a perspective view showing a state in which a leaf seat for a leaf spring according to the present invention is attached to an axle side.
FIG. 3 is a development view of a spring seat for a leaf spring according to the present invention.
FIG. 4A is a perspective view showing a state when a cross member according to the present invention is folded and formed. (B) is an A direction arrow directional view in FIG. 4 (A).
FIG. 5 is a perspective view showing a state in which a conventional spring seat for a leaf spring is attached.
FIG. 6 is a side view showing a state in which a conventional spring seat for a leaf spring is attached.
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-rear connection surface 5 Superposition surface 9 Plate material a Axle b Leaf spring

Claims (1)

A rectangular seat surface provided between the axle and the leaf spring and abutting on the leaf spring side; a pair of side connecting surfaces extending in the axle direction from a pair of edges perpendicular to the axle of the seat surface; A leaf spring spring seat comprising a pair of front and rear connecting surfaces extending at an acute angle from a pair of edges parallel to the axle of the seat surface, and the front and rear connecting surfaces, The connecting surface is integrally formed by folding a single plate, and the structure is such that stress relaxation can be achieved by folding the end portions of the front and rear connecting surfaces and overlapping the end portions of the side connecting surfaces. Spring leaf for leaf spring.

Images