JPH08291841A - Manufacture of liquid sealing bushing - Google Patents

Abstract

PURPOSE: To reduce the number of part items and man-hours by sealing the liquid in a liquid chamber with an elastic body engaged with a holding cylinder so that the external peripheral sections of both ends of the elastic body in its axial direction directly contacts the holding cylinder in a liquid tank and closely fixed to the internal peripheral surface of the holding cylinder. CONSTITUTION: A main liquid chamber lid and auxiliary liquid chamber lid 17 are covered on the main liquid chamber recessed section 6 and auxiliary liquid chamber recessed section 7 respectively in a liquid tank 30, forming an intermediate body 20. This intermediate body 20 is engaged with the inside of a holding cylinder 3 to which a mounting bracket 4 is integrally attached beforehand. Then, a punching die 31 is pressed against the end section of the holding cylinder 3 from the axial direction. A caulking section comprising the diameter of the end section of the holding cylinder 3 reduced is formed by this punching die 31. This fixes ring-like end walls 5 of both ends of the elastic body 2 to both ends of the holding cylinder 3 and makes the external peripheries of the ring-like end walls 5 closely contact the internal surface of the holding cylinder, sealing the liquid in the main liquid chamber and auxiliary liquid chamber.

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 liquid-sealed bush used for an engine mount, a suspension device, etc. of an automobile.

[0002]

In Japanese Patent Laid-Open No. 4-327038, an inner cylinder attached to an engine, an elastic body provided around the inner cylinder, an outer cylinder for fitting the outer peripheral side of the elastic body, and an outer periphery of the elastic body. The main body is composed of a plurality of liquid chambers which are open to the side and communicate with each other, and a mounting bracket for attaching the main body to the vehicle body is fitted to an integrated holding cylinder. , A liquid ring bush in which the main body and the holding tube are integrated by crimping both ends of the holding tube is shown.

[0003]

By the way, the crimping of the holding cylinder as in the above-mentioned conventional example is performed by roll crimping. However, this roll caulking has problems that it becomes difficult to work when the mounting bracket is integrated with the holding cylinder, and that it becomes difficult to work in the liquid tank.

Therefore, it is conceivable that the main body is taken out of the liquid tank and then attached to the holding cylinder. For this purpose, the outer cylinder is covered with the outer cylinder in advance in the liquid tank so as to integrate the liquid in the liquid chamber. It was necessary to configure the main body in a sealed state.

Therefore, since the outer cylinder is indispensable as a member for sealing the liquid inside, the number of parts is increased, and it is necessary to attach the outer cylinder of the main body and the holding cylinder outside the liquid tank. The man-hour also increased.

Further, when roll crimping is performed with the mounting bracket attached to the holding cylinder in advance, for example, it is necessary to form an escape portion as shown by an imaginary line a in FIG. Caused design constraints. On the other hand, if the mounting bracket is separated from the holding cylinder and the holding cylinder and the outer cylinder of the main body are crimped to each other and the mounting bracket is welded to the holding cylinder, the number of steps is further increased. The present invention aims to solve such problems.

[0007]

In order to solve the above-mentioned problems, the manufacturing method of the liquid ring bush according to the present invention is to provide an inner cylinder attached to either the vibration source side or the vibration receiving side, and the inner cylinder provided around the inner cylinder. An elastic body, a holding cylinder for fitting and holding the outer peripheral side of the elastic body, and a mounting bracket attached to the holding cylinder and attached to either the vibration source side or the vibration receiving side, In a method of manufacturing a liquid-sealed bush in which a plurality of liquid chambers that are open toward the outer peripheral side of the body and communicate with each other are provided in an elastic body, the elastic body is attached to a holding cylinder integrally provided with a mounting bracket in advance at both axial ends thereof. The process of fitting in the liquid tank so that the outer circumference is in direct contact, and the elasticity by shrinking the end of the holding cylinder by pressing the die from the length direction to the end of the holding cylinder in the liquid tank. Keep the outer circumference of both ends of the body in the axial direction Wherein the by tightly fixed to the inner peripheral surface of the cylindrical and a step of sealing the liquid in the liquid chamber.

[0008]

In the liquid tank, when the elastic body is fitted to the holding cylinder integrally provided with the mounting bracket in advance so that the outer peripheral portions of both ends in the axial direction are directly contacted with each other, each liquid chamber is filled with the liquid and The opening of the liquid chamber is covered with the inner surface of the holding cylinder.

In this state, when the die is pressed axially against the end of the holding cylinder in the liquid tank to reduce the diameter of the end of the holding cylinder, the elastic body is fixed in the holding cylinder and the elastic body Since the outer peripheral portions on both ends in the axial direction are in close contact with the inner surface of the holding cylinder, the liquid in the liquid chamber can be sealed.

According to this manufacturing method, since the outer cylinder, which has been indispensable in the past, is not required, the number of parts is reduced and the work can be performed only in the liquid tank. Therefore, the man-hour can be reduced and the fitting and caulking can be continuously performed. The workability can be improved because it can be achieved.

Moreover, since there is no restriction on the shape of the mounting bracket such as the conventional roll caulking, and the mounting bracket can be integrated with the holding tube in advance, workability is further improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid ring bush formed for an automobile engine mount will be described with reference to FIGS. 1 is a development view showing a method of manufacturing a liquid-sealed bush according to this embodiment, FIG. 2 is an external plan view of this embodiment, FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, and FIG. FIG. 4 is an enlarged sectional view taken along line 4-4.

As is apparent from these figures, the liquid ring bush is fitted with an inner cylinder 1 attached to the vehicle body (not shown) side, an elastic body 2 baked and integrated around the inner cylinder 1, and the elastic body 2. The holding cylinder 3 to be fitted is provided with a mounting bracket 4 which is welded to the outer peripheral portion of the holding cylinder 3 and attached to the engine (not shown) side which is a vibration source.

Both ends in the length direction of the elastic body 2 are holding cylinders 3.
The ring-shaped end wall 5 having an outer diameter slightly smaller than the inner diameter of the elastic body 2 is formed between the both ring-shaped end walls 5 at symmetrical positions with the inner cylinder 1 interposed therebetween. Thus, the main liquid chamber recess 6 and the sub liquid chamber recess 7 are formed.

A partition wall 8 parallel to the axial direction is formed between the liquid chamber recesses 6 and 7. A cavity 9 is formed in the thick portion of the partition wall 8 on the side of the sub liquid chamber recess 7 in the axial direction, and a portion facing the sub liquid chamber recess 7 is an elastic film 10. The elastic film 10 has a protrusion 12 protruding outward in the middle thereof.

The portion of the partition wall 8 sandwiched between the respective ends of the main liquid chamber recess 6 and the sub liquid chamber recess 7 forms an arcuate portion 13 which coincides with the outer circumference of the ring-shaped end wall 5, and the main liquid is located here. An arc-shaped groove 14 that connects the chamber recess 6 and the sub-liquid chamber recess 7 is formed. From the vicinity of the inner cylinder 1 of the partition wall 8, a protrusion 15 projects inward of the main liquid chamber recess 6.

The open portions of the main liquid chamber recess 6 and the sub liquid chamber recess 7 are covered with a main liquid chamber lid 16 and a sub liquid chamber lid 17, respectively. Each lid 1
6 and 17 have an arc shape that matches the outer diameter of the ring-shaped end wall 5, and both ends in the bending direction overlap the ends of the arc-shaped portion 13,
In addition, the cutout portion 18 is formed in the portion connected to the end of the arc-shaped groove 14,
19 is formed. An intermediate body 20 is formed by covering the elastic body 2 with the main liquid chamber lid 16 and the sub liquid chamber lid 17.

In addition, the central portion of the main liquid chamber lid 16 is formed with a raised portion 21 projecting into the main liquid chamber recess 6 by press molding, and an umbrella portion 22 is covered on the top portion and welded at the overlapping portion. . The umbrella portion 22 is close to the protrusion 15 and forms a stopper.

In the state of the intermediate body 20, the main liquid chamber recess 6 and the sub liquid chamber recess 7 are closed by the main liquid chamber lid 16 and the sub liquid chamber lid 17 to form a main liquid chamber 26 and a sub liquid chamber 27. Further, the intermediate body 20 is fitted into the holding cylinder 3, and the holding cylinder 3 and the arcuate groove 14 form an orifice passage 28. The main liquid chamber 26 and the sub liquid chamber 27 communicate with each other through the orifice passage 28.

Both ends of the holding cylinder 3 in the lengthwise direction are formed with caulking portions 29 which are tapered outwardly in the axial direction, and are made of elastic material 2.
The outer peripheral part of the ring-shaped end wall 5 is fixed to the inner peripheral surface of the holding cylinder 3 while the outer peripheral part of the ring is fixed in the holding cylinder 3. At this time, the protrusion 5a (FIG. 1) provided on the outer peripheral portion of the ring-shaped end wall 5 is crushed to maintain the sealing property.

Next, a method of manufacturing this liquid ring bush will be described. As shown in FIG. 1, the intermediate body 20 is formed by covering the main liquid chamber recess 6 and the sub liquid chamber recess 7 of the elastic body 2 with the main liquid chamber lid 16 and the sub liquid chamber lid 17, respectively, in the liquid tank 30. At this stage, the liquid in the liquid tank 30 is filled in the main liquid chamber 26 and the sub liquid chamber 27.

Subsequently, the intermediate body 20 is fitted into the holding cylinder 3 to which the mounting bracket 4 is previously attached and integrated. Although this fitting is press-fit with a force of about 1960 Newton (N), it may be an insertion with little force.

After fitting the intermediate body 20, the die 31 is held in the holding cylinder 3.
Push from the axial direction toward the end of. The stamping die 31 has a hole portion 32 carved in the axial direction from one end portion, the inner diameter thereof is slightly smaller than the outer diameter of the holding cylinder 3, and the opening edge portion forms a taper portion 33 that expands outward. The inner diameter of the entrance of the hole 32 is larger than the outer diameter of the holding cylinder 3.

In the figure, reference numeral 34 is a bottom portion of the die 31, 35 is a drain hole formed therethrough, and 36 is an arm attached to a pressing device (not shown). The pressing device is for giving a force to press the die 31 in the bushing direction, and a hydraulic device or the like can be appropriately used.

Therefore, the holding cylinder 3 is held by the die 31.
4 is reduced in diameter from the state shown by the phantom line b in FIG. 4 to the state shown by the solid line to form the crimped portion 29. This allows
The ring-shaped end walls 5 at both ends of the elastic body are fixed to both ends of the holding cylinder,
Moreover, the outer periphery thereof is in close contact with the inner surface of the holding cylinder 3 to seal the liquid in the main liquid chamber 26 and the sub liquid chamber 27.

By the way, to give an example, the die 3 at this time
The force for pushing 1 is about 19600 Newton (N), and the time required for its molding is about 15 seconds in this embodiment. By the way, if the same caulking work is performed by conventional roll caulking, it is molded with a force of about 14700 Newton (N) outside the liquid tank, and the time required for this molding is 3
It is about 0 seconds.

Therefore, according to this manufacturing method, the outer cylinder, which has been indispensable in the past, is not required, and the number of parts is reduced, and the work can be performed only in the liquid tank 30. Workability can be improved because caulking can be performed continuously.

Moreover, since there is no restriction on the shape of the mounting bracket 4 such as the conventional roll caulking, and the mounting bracket 4 can be integrated with the holding cylinder 3 in advance, workability is further improved.

The invention of the present application is not limited to the application to the engine mount of the conventional example, but can be applied to bushes for various purposes. For example, as a suspension bush, an end portion of a suspension arm or the like is used. It can also be applied to bushes that are used by fitting to.

[Brief description of drawings]

FIG. 1 is a development view showing a method of manufacturing a liquid ring bush according to an embodiment.

FIG. 2 is an external plan view of a liquid ring bush according to an embodiment.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG.

[Explanation of symbols]

1: inner cylinder, 2: elastic body, 3: holding cylinder, 4: mounting bracket, 5: ring-shaped end wall, 6: main liquid chamber recess, 7: sub liquid chamber recess, 8: partition wall, 16: main liquid Chamber lid, 17: Secondary liquid chamber lid, 2
6: Main liquid chamber, 27: Sub liquid chamber, 28: Orifice passage, 2
9: caulking part, 30: liquid tank, 31: die

Claims (1)

[Claims] 1. An inner cylinder attached to one of a vibration source side and a vibration receiving side, an elastic body provided around the inner cylinder, and a holding cylinder for fitting and holding an outer peripheral side of the elastic body. And a mounting bracket that is attached to the holding cylinder and is attached to either the vibration source side or the vibration receiving side, and the plurality of liquid chambers open toward the outer peripheral side of the elastic body and communicating with each other are elastic body. In the method for manufacturing the liquid-sealing bush provided in step 1, the step of fitting the elastic body to the holding cylinder integrally provided with the mounting bracket in advance in the liquid tank so that the outer peripheral portions of both ends in the axial direction are directly contacted, and the liquid tank is continued. In the liquid chamber, the die is pressed against the end of the holding cylinder from the length direction to reduce the diameter of the end of the holding cylinder, so that the outer peripheral portions of both ends of the elastic body in the axial direction are closely fixed to the inner peripheral surface of the holding cylinder. And the step of sealing the liquid of Preparation of the liquid seal bush to.