JPH05220533A - Manufacture of vibration proof rubber mount bracket - Google Patents

Abstract

PURPOSE:To integrally mold the fitting part and the fixing part for other members, of a vibration proof rubber bush, by cutting a long bracket material produced through an extrusion process and bending the joint part. CONSTITUTION:The mount bracket 1 is constituted of a cylindrical part 2 and the joint part 3 which is extended to both front and rear side along the axial line of the cylindrical part. The vibration proof rubber bush 7, which consists of an inner cylinder 4 and an outer cylinder 5, which are made of metal, and the rubber part 6 which is adhered with valcanization between both the cylinders, is fitted in the inner peripheral surface of the cylindrical part 2. This cylindrical part 2 and the joint part 3 which is fixed on other members with bolts, etc., are integrally extruded. The extruded article is then cut at equal intervals apart in the direction crossing the extruding direction. The constricted part 9 of the joint part is twisted at an angle of 90 degrees, the joint part is made parallel to the axis line of the cylindrical part 2, bolt holes 8 are made and the product is complete. Thus, the fitted part and the fixing part are integrally formed, and the degree of freedom in setting the position of the joint part is raised.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a mount bracket for a vibration-proof rubber bush which is interposed in a joint portion of an engine or a transmission with respect to a vehicle body.

[0002]

2. Description of the Related Art A cylindrical vibration-proof rubber bush is interposed at the joint between an engine, a transmission and the like and a vehicle body. A bracket for holding this vibration-proof rubber bush has hitherto been a steel plate press. Generally, a plurality of molded members are welded and joined together. However, in recent years, there is a tendency to increase the tendency to further reduce the weight and simplify the manufacturing process, and further improvement of this conventional structure has been desired.

As a method of manufacturing a mount bracket that meets such demands, first, a long material having a uniform cross-sectional shape in the axial direction is formed by extrusion molding of an aluminum alloy, and then this is oriented in a direction crossing the extrusion direction. A method of cutting into pieces is proposed in Japanese Patent Application Laid-Open No. 62-3920.

[0004]

Although this manufacturing method is extremely advantageous in terms of productivity, it has to be pushed out in the axial direction of the fitting hole of the vibration-proof rubber bush, and therefore the fastening portion has a cross-sectional profile which makes it convenient. There is an inconvenience that the position is defined. In particular, it is difficult to provide the fastening portion in the same direction as the press-fitting direction of the anti-vibration rubber bush.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to ensure productivity by extrusion molding and to secure the position of the fastening portion with respect to other members. An object of the present invention is to provide a method for manufacturing a vibration-proof rubber mount bracket that can increase the degree of freedom.

[0006]

According to the present invention, there is provided a tubular portion to which a vibration-proof rubber bush is fitted, and
A method of manufacturing an anti-vibration rubber mount bracket having a fastening portion fixed to another member with a bolt or the like, comprising a step of integrally extruding the tubular portion and the fastening portion, and a step of intersecting the extruded direction of the molded product. It is achieved by providing a method for manufacturing a vibration-proof rubber mount bracket, which comprises the steps of cutting in the same direction at equal intervals and bending the fastening portion.

[0007]

With this structure, the fastening portion can be provided at an arbitrary position without impairing the formability due to extrusion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

1-A-B-C show a manufacturing procedure of a mounting bracket according to the present invention. As shown in FIG. 1-C, the finished product 1 of this mount bracket is composed of a tubular portion 2 and a fastening portion 3 extending to the front and rear sides along the axial direction of the tubular portion 2. Cage, metallic inner cylinder 4
A vibration-proof rubber bush 7 including an outer cylinder 5 and a rubber portion 6 vulcanized and bonded between the both cylinders 4 and 5 is fitted to the inner peripheral surface of the cylindrical portion 2 and is attached to the fastening portion 3. By inserting a bolt (not shown) into the provided bolt hole 8, it is fixed to the mating member.

The mount bracket 1 is manufactured by a known extrusion molding machine. First, an aluminum alloy billet that has been preheated and is in a semi-molten state is pressed into a die having a predetermined cross-sectional shape and pressed to obtain a long bracket material M1 having a constant cross-sectional shape (see FIG. 1-A). ..

Next, the bracket material M1 is cut at equal intervals in the extruding direction and along a plane substantially orthogonal to the extruding direction (see FIG. 1-B). As a result, a semi-finished product 1a of a plurality of mount brackets having an appropriate thickness can be obtained from the long bracket material M1.

Next, the constricted portion 9 between the tubular portion 2 and the fastening portion 3 is twisted by 90 degrees so that the fastening portion 3 is oriented along the axis of the tubular portion 2. Then, the bolt 1 is formed in the fastening portion 3 to complete the mount bracket 1 (see FIG. 1-C).

Now, according to the conventional manufacturing method, as shown in FIG.
In order to stay in the stage shown in (2), the direction of the fastening part had to be placed in the direction orthogonal to the axis of the tubular part. for that reason,
In some cases, there were restrictions due to the shape of the mating member, and the range of application of extrusion molding of aluminum material was narrowed. However, according to the present invention, the position of the fastening portion can be set relatively freely.

FIGS. 2-A-B-C-D show another embodiment of the present invention. In this embodiment, the fastening portion is a semi-finished product 21 cut out from a long bracket material M2.
At the stage a, it is composed of two sets of mounting legs 22 and 23 extended at intervals of approximately 90 degrees in the vertical direction and the horizontal direction on the tangent line from the outer peripheral contour of the tubular portion 2 (FIG. 2). -See B).

The extrusion-molded bracket material M2 (see FIG. 2-A) is cut in the same manner as in the first embodiment (see FIG. 2-B), and then a crack 24 is formed at the center of the vertical leg 22 in the extrusion direction. (See Figure 2-C). Then open the lower ends of the vertical legs 22 horizontally from the splits 24 to both sides,
The lower surfaces of the legs 22 and 23 should be in the same plane.
Then, a bolt bracket 25 is formed at the end of each leg 22 and 23 to obtain a completed mount bracket 21 (see FIG. 2-D). The bolt holes on the vertical leg 22 side may be processed at the same time as the extrusion molding.

In addition to this, as shown in FIGS. 3A and 3B, a suitable number of protrusions 11 projecting inwardly from the general inner peripheral surface are equally spaced on the inner peripheral surface of the tubular portion 2. If the projection 11 is crushed when the outer cylinder 5 of the anti-vibration rubber bush 7 is press-fitted, it is possible to set the desired retaining load and anti-rotation load by the shape and quantity of the protrusion. Therefore, finishing of the inner diameter of the rubber bush fitting hole can be simplified. At this time, the meat in the portion of the protrusion 11 is crushed, but it is advisable to provide the depressions 12 on both sides of the protrusion 11 to adjust the flow of the meat.

[0017]

As described above, according to the present invention, by cutting the long bracket material obtained by extrusion and bending the fastening portion, the fitting portion of the anti-vibration rubber bushing is cut. It is possible to integrally form the fixing portion with respect to other members, and it is possible to increase the degree of freedom in setting the position of the fastening portion. Therefore, there is a great effect in reducing design restrictions without impairing productivity.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing procedure of a bracket according to the present invention.

FIG. 2 is an explanatory diagram showing another embodiment of the manufacturing procedure of the bracket according to the present invention.

FIG. 3 is a partial enlarged view of a vibration-proof rubber bush fitting hole of a tubular portion.

[Explanation of symbols]

 M1 ・ M2 Bracket material 1.21 Mount bracket finished product 2 Cylindrical part 3 Fastening part 4 Inner cylinder 5 Outer cylinder 6 Rubber part 7 Anti-vibration rubber bushing 8 ・ 25 Bolt hole 9 Constricted part 11 Protrusion 12 Depression 22 ・ 23 Mounting Leg 24 split

Claims (1)

[Claims] 1. A cylindrical portion into which a rubber cushion is fitted,
A method of manufacturing an anti-vibration rubber mount bracket having a fastening portion fixed to another member with a bolt or the like, the method including: a step of integrally extruding the tubular portion and the fastening portion; A method of manufacturing a vibration-proof rubber mount bracket, comprising: a step of cutting the fastening portion at equal intervals; and a step of bending the fastening portion.