JP3356300B2 - Manufacturing method of anti-vibration rubber mount bracket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a mount bracket of a vibration-proof rubber bush interposed at a joint of an engine and a transmission with a vehicle body.

[0002]

2. Description of the Related Art A cylindrical anti-vibration rubber bush is interposed at a joint portion between an engine and a transmission and a vehicle body. It is common to adopt a configuration in which a plurality of members formed by welding are joined. In recent years, however, there has been a tendency to increase efforts 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 meeting such a demand, a long material having a uniform cross-sectional shape in the axial direction is first formed by extruding an aluminum alloy, and then a long material is formed in a direction intersecting the extruding direction. Japanese Patent Application Laid-Open No. Sho 62-3920 proposes a method for cutting into pieces.

[0004]

Although this manufacturing method is extremely advantageous in terms of productivity, it must be extruded in the axial direction of the fitting hole of the vibration-isolating rubber bush, so that the fastening portion is not provided due to the cross-sectional profile. There is a disadvantage 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 vibration-proof rubber bush.

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

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a cylindrical portion on which a vibration-proof rubber bush is fitted.
A method of manufacturing a rubber vibration isolator mounting bracket having a fastening part with a bolt or the like is fixed to the other member, a cylindrical
A first portion having a shape and an outer peripheral portion of the first portion.
Extrusion molding with tangentially extending second part integrally
And extruding the molded product formed in the step
Cutting at equal intervals in the direction intersecting the direction,
The second part in each piece formed by the
The first portion is bent in a direction along an axial direction of the first portion, and
Forming an anti-vibration rubber mouse
Cutting brackets or cut them at equal intervals
The second portion in each piece formed in the step of
In the direction of the extrusion direction
The step of forming a crack and the opening of the crack formed in the step
The second portion in a direction along the axial direction of the first portion.
Bending the portion to form the fastening portion. The manufacturing method of the anti-vibration rubber mount bracket is provided.

[0007]

According to such a configuration, a fastening portion can be provided at an arbitrary position without impairing the formability by extrusion.

[0008]

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

FIGS. 1A, 1B, 1C and 1C show a manufacturing procedure of a mount bracket according to the present invention. As shown in FIG. 1C, the completed product 1 of the mount bracket includes a tubular portion 2 and fastening portions 3 extending to both front and rear sides along the axial direction of the tubular portion 2. cage, made of metal inner tube 4
An anti-vibration rubber bush 7 composed of an outer cylinder 5 and a rubber part 6 vulcanized and bonded between the two cylinders 4 and 5 is fitted on the inner peripheral surface of the cylindrical part 2 and A bolt (not shown) is inserted through the provided bolt hole 8 so as to be fixed to the mating member.

The mount bracket 1 is manufactured by a known extruder. First, a billet of an aluminum alloy which is preheated and in a semi-molten state is pressed into a die having a predetermined cross-sectional shape, and is pressed into a cylindrical shape.
A first portion Ma forming an outer peripheral portion of the first portion Ma.
And a second portion extending tangentially to the first portion Ma
Elongated bracket material M with constant cross-sectional shape consisting of Mb
1 (see FIG. 1-A).

Next, the bracket blank M1 is cut at regular intervals in the extrusion direction and along a plane substantially perpendicular to the extrusion direction (see FIG. 1B). As a result, a plurality of pins having an appropriate thickness are formed from the long bracket material M1.
The semi-finished product 1a of the mounting bracket as a base is obtained.

Next , the first part of each semi-finished product 1a
Cut from the cylindrical portion 2 cut out from Ma and the second portion Mb
The constricted portion 9 Ru 90 Dosuji between the fastening portion 3 issued Ri
And the direction of the fastening portion 3 is set along the axis of the tubular portion 2. Then, a completed product 1 of the mount bracket is obtained by drilling a bolt hole 8 in the fastening portion 3 (see FIG. 1C).

Now, according to the conventional manufacturing method, FIG.
To stay in step shown in, the fastening portion 3 of the orientation cylindrical portion 2
Had to be placed in a direction perpendicular to the axis. For this reason, the shape of the mating member may be somewhat limited, and the applicable range of the extrusion molding using the aluminum material has been narrowed. According to the present invention, however, the position of the fastening portion can be set relatively freely.

FIGS. 2A, 2B, 2C, and 2D show another embodiment of the present invention. In this embodiment, a long bracket
Outside the cylindrical first portion Ma of the cut material M2
The second portion Mb which is in contact with the peripheral portion and extends in the tangential direction,
Extending only to one side from the center line of the first portion Ma
And separately from this, in a direction orthogonal to the second portion Mb.
The third portion Mc extends from the outer peripheral portion of the first portion Ma.
Have been. It is cut in the same manner as in the first embodiment, and
As a piece cut out from the bracket material M2
At the stage of the semi-finished product 21a, cut from the second portion Mb
The protruding part is perpendicular to the tangent from the outer peripheral contour of the cylindrical part 2.
A third part, which forms one of the mounting legs 22 extending in the vertical direction;
The portion cut out from Mc is taken from the outer peripheral contour of the cylindrical portion 2.
The other mounting leg 23 extending horizontally on the tangent of
(See FIG. 2-B).

[0015] Next, push the extrusion direction center of the vertical leg 22
The fracture 24 is formed in a direction intersecting the extruding direction (see FIG. 2-C). Then, from the split 24, the vertical leg 2
Bent horizontally opened memorial the second lower end on both sides, each leg 22,
The lower surface of 23 is made to be the same plane. A completed product of the mount bracket 21 is obtained by drilling the bolt holes 25 at the ends of the legs 22 and 23 (see FIG. 2-D). The bolt holes on the side of the vertical legs 22 may be simultaneously processed during extrusion molding.

In addition, as shown in FIGS. 3A and 3B, on the inner peripheral surface of the cylindrical portion 2, a suitable number of protrusions 11 projecting inward from the general inner peripheral surface are provided at regular intervals. If the projection 11 is crushed when the outer cylinder 5 of the vibration-proof rubber bush 7 is press-fitted, the desired retaining load and detent load can be set by the shape and quantity of the projection. Therefore, the finishing of the inner diameter of the rubber bush fitting hole can be simplified. At this time, the flesh of the projection 11 is crushed. However, it is preferable to provide a depression 12 on both sides of the projection 11 to adjust the flow of the flesh.

[0017]

As described above, according to the present invention, by cutting the long bracket material obtained by the extrusion process and bending the fastening portion, the fitting portion of the vibration-proof rubber bush is fitted. And a fixing portion to other members can be integrally formed, and the degree of freedom in setting the position of the fastening portion can be increased. Therefore, there is a great effect in reducing design constraints without impairing productivity.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

 M1, M2 Bracket material 1, 21 Finished product of mount bracket 2 Cylindrical part 3 Fastening part 4 Inner cylinder 5 Outer cylinder 6 Rubber part 7 Anti-vibration rubber bush 8.25 Bolt hole 9 Constriction part 11 Projection 12 Depression 22,23 Mounting Leg 24 split

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-237869 (JP, A) JP-A-5-57387 (JP, A) JP-A-5-185171 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B21D 53/86 B21D 53/88 B60K 5/12

Claims (2)

(57) [Claims] 1. A method of manufacturing an anti-vibration rubber mount bracket, comprising: a cylindrical portion into which an anti-vibration rubber bush is fitted; and a fastening portion fixed to another member with bolts or the like. 1 and the outer peripheral portion of the first portion.
Extruding the second portion extending in the tangential direction integrally with the molded article; and cutting the molded article formed in the step at equal intervals in a direction intersecting the extrusion direction. Said second part in each piece formed
And bending the first portion in a direction along the axial direction of the first portion to form the fastening portion. (2) Cylindrical part to which anti-vibration rubber bush is fitted
And a fastening part that is fixed to another member with bolts, etc.
A method of manufacturing a vibration-proof rubber mount bracket, A first portion having a cylindrical shape and an outer peripheral portion of the first portion;
And extrude tangentially extending second part together
Molding step; Cross the molded product formed in the process in the extrusion direction
Cutting at equal intervals in the direction; The second portion in each piece formed in the step
In the direction of the extrusion direction
The process of putting the eyes, Open the crack formed in the step and open the first portion.
Bending the second portion in a direction along the axial direction to
And forming a joint.
Manufacturing method of mount bracket.