JPH08233019A - Cylindrical member of mounting device and its manufacture - Google Patents

Abstract

PURPOSE: To hardly transmit vibration to a vibration receiving side by forming four notches in parallel along the circumferential direction on one axial end side, and also diminish parts to be discarded by a trimming working, in the cylindrical member of a mounting device. CONSTITUTION: A circular ring part 20A having L-shaped cross section is formed on one axial end side of the inner cylindrical metal fitting 20 of a strut mount which is a mounting device, and a circular tube part 20B whose diameter is smaller than the ring part 20A is formed at the other end part. Further, the ring part 20A and the circular tube part 20B are engaged with each other by a taper connecting part 20C, and four notches 22 are formed in parallel at equal intervals along a circumferential direction around the ring part 20A. Drawing is executed under such a condition that parts to be notches 22 are arranged in a position matched to the center of each four corner of a square blank member. At this time, the center parts of four corners of the blank member are hauled on a center side so that the notches 22 are respectively formed accompanying the drawing. After this process, four corners of the blank member are trimmed so as to form holes, and the ring part 20A are machined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical member of a mount device and a method of manufacturing the cylindrical member of the mount device, which can be applied to a mount device such as a strut mount installed in a vehicle. It is something.

[0002]

2. Description of the Related Art For example, between a vehicle body and wheels,
A suspension device including a shock absorber and a coil spring is provided, and a shock absorber serving as a damping element and a coil spring serving as a spring element absorb the vibration transmitted from the wheel side and transmit the vibration to the vehicle body side. It is designed to prevent Therefore, when the vehicle travels and the vibration is transmitted from the road surface side through the wheels, the suspension device has a soft spring property and accelerates the damping of the vibration.

In order to elastically connect such a suspension device to the vehicle body side, a mount device is formed between the suspension device and the vehicle body, which is made of an inner and outer cylinder and a rubber material connecting the inner and outer cylinders. A strut mount is in place.

The blank 112 of the inner cylinder 110 used for such a strut mount is punched out in a circular shape from the plate-shaped material 120 shown in FIG. 8 and taken out as shown in FIG. 7 (a). It was Then, after being drawn as shown in FIG. 7B, an unnecessary portion 114 protruding to the outer peripheral side of the chain double-dashed line due to this drawing is shown in FIG.
As shown in FIG. 7C, trimming is performed to form a hole in the center, and finally, as shown in FIG. 7D, the rising portion 1 extending in the axial direction over the entire circumference of the inner cylinder 110.
In order to provide 16, the start-up process was performed.

[0005]

As described above, when the inner cylinder 110 of such a strut mount is manufactured, a large number of parts are discarded by the trimming process, resulting in a poor material yield and an increase in manufacturing cost. Was there.

In view of the above facts, an object of the present invention is to obtain a low-cost mounting member tubular member and a method of manufacturing a mounting member tubular member.

[0007]

A tubular member of a mount device according to claim 1 is connected to an attachment member connected to one of a vibration generating portion and a vibration receiving portion through an elastic body, and the vibration generating portion. And a cylindrical member of a mount device connected to the other of the vibration receiving portions, characterized in that four cutout portions are formed side by side along the circumferential direction on the one axial end side.

According to a second aspect of the present invention, there is provided a method of manufacturing a tubular member of a mounting device, wherein the vibration generating portion and the vibration receiving portion are connected to an attachment member connected to one of the vibration generating portion and the vibration receiving portion via an elastic body. A method of manufacturing a tubular member of a mounting device connected to the other of the parts, wherein a blank material is taken out from a plate-shaped material in a square shape, and further, at a position corresponding to each of the four sides of the blank material, the tubular member is In order to be in a state in which the portion that will be the notch provided on the one end side in the axial direction is arranged,
The blank material is drawn into a tubular member.

[0009]

The operation of the tubular member of the mount device according to claim 1 will be described below.

When the vibration generating portion generates vibration, for example, the suspension device absorbs the vibration, so that it is difficult to transmit the vibration to the vibration receiving portion side connected to the cylindrical member or the mounting member of the mount device.

Further, in the portion on the one end side in the axial direction of the tubular member,
Four notches are formed side by side along the circumferential direction.
Therefore, the blank material is drawn out in a square shape from the plate-shaped material, and the blank material is drawn at positions corresponding to the four sides of the blank material. The member can be manufactured.

Therefore, when manufacturing the cylindrical member of the mount device, the portion to be discarded by trimming can be reduced, the yield of the material can be improved, and the manufacturing cost can be reduced.

The operation of the method for manufacturing the tubular member of the mounting apparatus according to the second aspect will be described below. The blank material is taken out from the plate-shaped material in a square shape, and is drawn so that the cutout portions are arranged at the positions corresponding to the four sides of the blank material. In addition, it is possible to reduce the portion to be discarded by the trimming process, improve the material yield, and reduce the manufacturing cost.

[0014]

EXAMPLE A cylindrical member of a mounting device according to the present invention,
1st Example of the manufacturing method of the cylindrical member of a mounting apparatus is shown in FIG.
4 to FIG. 4, and the present embodiment will be described based on these figures.

As shown in FIG. 2 showing the suspension device 30 to which the tubular member of this embodiment is applied, the tubular portion of the shock absorber 12 for damping vibration is formed by the main body 12A, and this is provided on the wheel side (not shown). The main body 12A is connected. An extendable rod 12B extends from the main body 12A, and the tip side of the rod 12B extends toward the bearing 1A.
4 is fitted to the inner ring side.

An outer cylinder metal fitting 16 which is a mounting member for mounting the suspension device 30 on the vehicle body side (not shown) is arranged on the upper side of the shock absorber 12, and a rubber material is used inside the outer cylinder metal fitting 16. The formed elastic body 18 is arranged by vulcanization adhesion. Inside the elastic body 18, an inner cylindrical metal fitting 20 which is a cylindrical member press-fitted into the elastic body 18 is located, and a bearing 14 fitted to the tip end side of the rod 12B is fitted to the inner cylindrical metal fitting 20. It is in a state of having it inside.

As described above, the wheels connected to the shock absorber 12 are the outer cylinder fitting 16, the elastic body 18, and the inner cylinder fitting 2.
It is rotatably supported on the vehicle body side by a strut mount 10 composed of 0 and the like, and a bearing 14.

Further, on the outer peripheral side of the shock absorber 12, a bump stopper 24 integrally formed with a bellows portion and a coil spring 26 are arranged so as to surround the shock absorber 12.

As shown in FIG. 1, an annular ring portion 20A having an L-shaped cross section is formed on one end side in the axial direction of the inner cylindrical metal member 20 of the strut mount 10 which is the mounting device according to the present embodiment. A tubular circular tube portion 20B having a smaller diameter than the ring portion 20A is formed on the other end side of the inner tubular metal member 20. Furthermore, these ring parts 20
A connecting portion 20C formed in a tapered shape connects between A and the circular pipe portion 20B.

In this ring portion 20A, four cutout portions 2 are arranged at equal intervals along the circumferential direction of the ring portion 20A.
2 are provided so as to cut out the ring portion 20A in an arc shape.

Next, a method of manufacturing the tubular member of the mounting apparatus according to this embodiment will be described. First, a square blank material 42 is taken out from the rolled plate-shaped material 40 as shown in FIG. 3, and as shown in FIG. 4A, at a position corresponding to the center of each of the four sides 42A of the blank material 42, The blank material 42 is drawn so that the portion that becomes the cutout portion 22 of the inner tubular metal member 20 is arranged.

During the drawing, the central portions of the four sides 42A of the blank 42 are pulled toward the center of the blank 42, so that the notches 22 are formed along with the drawing. Then, after the drawing process, the four corners of the blank material 42 are trimmed and removed, and the central portion 42B of the blank material 42 that closes the circular pipe portion 20B.
To form a hole. Finally, a portion of the inner tubular member 20 that extends in the axial direction over the entire circumference is processed and provided in the ring portion 20A to complete the inner tubular member 20.

Next, the operation of the cylindrical member of the mounting apparatus and the method of manufacturing the cylindrical member of the mounting apparatus according to this embodiment will be described.

When the vehicle travels and the vibration is transmitted from the road surface side through the wheels, which are the vibration generating portions, the suspension device 30 has a soft spring property and accelerates the damping of the vibration. . Then, the elastic body 18 arranged between the inner tubular metal fitting 20 and the outer tubular metal fitting 16 of the strut mount 10 is provided in the suspension device 30.
Is elastically supported by the vehicle body which is the vibration receiving portion.

Further, four notches 22 are formed along the circumferential direction at the axially one end side portion of the inner tubular member 20 according to the present embodiment.
Are formed side by side. Therefore, the blank material 42 is drawn so that the cutout portions 22 are arranged at the positions corresponding to the four sides 42A of the blank material 42 that is taken out from the plate-shaped material 40 in a square shape. Thus, the inner tubular fitting 20 can be easily manufactured.

Therefore, when manufacturing the inner cylinder metal fitting 20 of the strut mount 10, it is possible to reduce the scrap portion to be discarded by trimming processing as compared with the inner cylinder of the prior art, the yield of the material is improved, and the manufacturing cost is improved. Will be reduced.

Along with this, as shown in FIGS. 4A and 4B, the material weight of the blank 42 should be reduced by about 20% as compared with the blank 112 for the inner cylinder of the prior art. Therefore, it is possible to further contribute to cost reduction. Since the notch 22 is set at four positions in the ring portion 20A on the axially one end side of the inner tubular metal fitting 20, the weight of the inner tubular metal fitting 20 can be reduced.

A second embodiment according to the present invention is shown in FIGS. 5 and 6, and this embodiment will be described with reference to these drawings. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

As shown in FIGS. 5 and 6, triangular ribs 28 are provided at, for example, four places at equal intervals on the inner peripheral side of the ring portion 20A of this embodiment. In other words, in this embodiment,
Since the strength may be reduced due to the provision of the four cutout portions 22, an example in which they are reinforced by these ribs 28 is shown.

The material of the inner cylinder of the above embodiment may be steel, for example, but the material is not limited to this and may be aluminum material or other metal material.

On the other hand, in the above embodiment, the strut mount used in the vehicle has been described as an example, but it goes without saying that the present invention can be used for other purposes, and the shape and the like of the embodiment are also the same. It is not limited.

[0032]

Since the tubular member of the mount device and the method of manufacturing the tubular member of the mount device according to the present invention are configured as described above, it is possible to obtain the tubular member at low cost. Have.

[Brief description of drawings]

FIG. 1 is a perspective view of an inner cylinder fitting according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a suspension device to which the inner tubular fitting according to the first embodiment of the present invention is applied.

FIG. 3 is a perspective view showing a material and a blank material for the inner tubular metal fitting according to the first embodiment of the present invention.

FIG. 4 is a view showing a blank material for an inner tubular metal fitting according to a first embodiment of the present invention in comparison with a blank material of a prior art, (a) being for the inner tubular metal fitting according to the first embodiment. FIG. 3B is a plan view of the blank material of FIG. 3B, and FIG.

FIG. 5 is a perspective view of an inner cylinder fitting according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of an inner cylinder metal fitting according to a second embodiment of the present invention.

FIG. 7 is an explanatory view showing a manufacturing process of the inner cylinder of the conventional strut mount.

FIG. 8 is a perspective view showing a material for an inner cylinder of a conventional strut mount.

[Explanation of symbols]

 10 Strut Mount 16 Outer Cylinder Metal Fitting 18 Elastic Body 20 Inner Cylinder Metal Fitting 22 Notch 42 Blank Material

Claims (2)

[Claims] 1. A tubular member of a mount device, which is connected to an attachment member connected to one of the vibration generating portion and the vibration receiving portion via an elastic body and is connected to the other of the vibration generating portion and the vibration receiving portion. A tubular member of a mounting device, wherein four notches are formed side by side along the circumferential direction on the one axial side. 2. A tubular member of a mount device, which is connected to a mounting member connected to one of the vibration generating unit and the vibration receiving unit via an elastic body and is connected to the other of the vibration generating unit and the vibration receiving unit. A manufacturing method, in which a blank material is taken out from a plate-shaped material in a square shape, and further, a portion serving as a notch provided on one end side in the axial direction of the tubular member is arranged at a position corresponding to each of the four sides of the blank material. The method for manufacturing a tubular member of a mount device, wherein the blank material is drawn into a tubular member so as to be in a state of being pressed.