JP2003042228A - Rubber cushion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling workability of a rubber cushion to a fitting counter-member and temporarily retain the rubber cushion with hits assembled to the fitting counter-member without using adhesive. SOLUTION: A pair of rubber cushion bodies 21 and 21 have a pair of bosses 21a and 21a, which are inserted into a through hole 17c formed in the plate- shaped fitting counter-member 17 form the both surfaces, projected therefrom respectively and the centers of the bosses are formed with through holes 21b capable of inserting cushion fitting bolts 24. The pair of cushion bodies are connected by a rubber connecting bolt 22. The outside diameter of the base part 21c of the boss is formed larger than the inside diameter of the through hole and formed into a cylindrical shape so as to be press-fitted into the through hole. The outside diameter of the base end of a truncated cone part 21d connected to the tip of the base is formed same as the outside diameter of the base and gradually narrowed toward the tip, and the outside diameter of the tip is formed smaller than the inside diameter of the through hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber cushion for holding a vibrating member such as an exhaust pipe or a muffler of a vehicle while absorbing the vibration.

[0002]

2. Description of the Related Art Conventionally, a substantially cylindrical rubber bush is interposed between a support bracket of an exhaust pipe and a body-side member of a vehicle, and an annular groove formed on an outer peripheral surface of the rubber bush at an axial center thereof. An exhaust pipe support structure in which the holes of the support bracket are fitted is disclosed (JP-A-6-297).
965). In this exhaust pipe support structure, a recess is formed over the entire circumference on the inner peripheral surface of the rubber bush in the axial center,
The rubber bush is formed so that the inner cylinder and the bolt can be inserted therethrough. In the exhaust pipe support structure thus configured, since the recess is formed on the inner peripheral surface of the rubber bush at the center in the axial direction, the nut is screwed into the bolt inserted through the inner cylinder into the rubber bush to form the rubber bush. When is compressed in the axial direction, the maximum tensile stress conventionally generated on the inner peripheral surface of the rubber bush at the center in the axial direction can be relaxed, and rubbing with the inner cylinder inside thereof can be eliminated. As a result, it is possible to prevent the rubber bush from cracking, so that the durability of the rubber bush can be improved.

On the other hand, there is disclosed a gasket structure in which two ring-shaped seal portions are joined by a plate-like connecting portion, and a deformation margin having a low hardness is provided at a boundary portion between the seal portion and the connecting portion. (JP-A-11-201284). In the structure of the gasket thus configured, the union bolt is connected to the hydraulic pump with the union bolt in a state where the two joint portions are bent to make the two seal portions parallel to each other and the eye joints are sandwiched between these seal portions. When tightened through the joint, rotational stress acts on the seal portion. However, this stress is absorbed by the deformation margin having low hardness, so that the seal portion is not deformed.

[0004]

However, in the exhaust pipe support structure disclosed in the above-mentioned Japanese Patent Laid-Open No. 6-297965, when the annular groove of the rubber bush is deep, the hole of the support bracket is inserted into the annular groove of the rubber bush. The rubber bush had to be largely elastically deformed when fitting with each other, and the workability of assembling the rubber bush to the support bracket was poor. Further, the above-mentioned conventional Japanese Patent Laid-Open No. 11-20128.
In the structure of the gasket shown in Japanese Patent Publication No. 4, when the eye joint is sandwiched between the two seal parts and the hands are released,
There is a problem that the seal part comes off from the eye joint and it cannot be held in the temporary assembled state where the eye joint is sandwiched by the two seal parts, and an adhesive must be used to hold it in the temporary assembled state. It was An object of the present invention is to provide a rubber cushion which can improve workability of assembling to a member to be attached and can be temporarily held in a state of being attached to the member to be attached without using an adhesive.

[0005]

The invention according to claim 1 is
As shown in FIG. 1, a pair of bosses 21a, 2 which can be inserted from both sides into through holes 17c formed in the plate-shaped member 17 to be attached.
A pair of cushion main bodies 2 made of rubber, each of which is provided with a protrusion 1a and through holes 21b, 21b through which a cushion mounting bolt 24 can be inserted are formed at the centers of a pair of bosses.
1, 21 and a rubber coupling band 22, 22 for coupling a pair of cushion bodies, wherein the boss 21a has an outer diameter larger than the inner diameter of the through hole 17a and is formed in the through hole. A press-fittable cylindrical base portion 21c,
A truncated cone part 21d which is continuously provided on the tip of the base part and whose outer diameter is the same as that of the base part and which becomes gradually smaller toward the tip and whose outer diameter is smaller than the inner diameter of the through hole 17c. And having. In the rubber cushion described in claim 1, the cushion body 21
The rubber cushion 16 can be assembled to the attached member 17 by a relatively simple work of press-fitting the boss 21a of the above into the through hole 17c of the attached member 17, and the boss 21a of the cushion body 21 can be attached to the attached member 17 Through hole 17
Since it is pressed into c, the boss 21a becomes difficult to separate from the through hole 17c of the mounted member 17. Since the pair of cushion bodies 21 and 21 are connected by the connecting band 22,
The number of parts does not increase, and the complexity of parts management can be prevented.

The invention according to claim 2 is the invention according to claim 1, further, as shown in FIGS. 1, 3 and 4, the connecting band 22 is one or two, and a pair of cushions. The pair of bosses 21a, 21a of the main bodies 21, 21 are attached to the mounted member 1
The length of the connecting band is set so that tension acts on the connecting band 22 when the connecting band is inserted into the through holes 17c of No. 7 from both sides. In the rubber cushion described in claim 2, the boss 21a of the cushion body 21 is press-fitted into the through hole 17c of the mounted member 17, and the boss 21a is further pressed against the inner peripheral surface of the through hole 17c by the connecting band 22. Therefore, the boss 21a becomes more difficult to separate from the through hole 17c.

The invention according to claim 3 is the invention according to claim 1 or 2, further, as shown in FIGS. 2 and 6, the attached member 17 is either the exhaust pipe 13 or the muffler 12, or Either of the exhaust pipe 13 or the muffler 12 is a bracket for attaching both to the chassis 11 or the vehicle body, one end of the bracket 17 is attached to the chassis 11 or the vehicle body, and the other end of the bracket 17 is connected to the other end of the bracket 17 via a pair of cushion bodies 21 and 21. One or both are attached. According to the rubber cushion described in claim 3, the exhaust pipe 13 and the like can be relatively easily assembled to the chassis 11 and the like via the rubber cushion 16 and the bracket 17, and the exhaust pipe 13 and the like of the engine The vibration is absorbed by the rubber cushion 16.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 6, an exhaust pipe 13 to which a muffler 12 is connected is provided below the chassis frame 11 of the vehicle substantially parallel to the chassis frame 11. The exhaust pipe 13 and the muffler 12 are provided with a stay 14 and a rubber cushion. Chassis frame 11 via 16 and bracket 17
Mounted on. As shown in FIGS. 2 and 4, the bracket 17 is formed in a substantially L shape including a vertical piece 17a and a horizontal piece 17b. One end of the bracket 17, that is, the vertical piece 1
7a is a chassis frame 11 with bolts 18 and nuts 19
The exhaust pipe 13 and the muffler 12 are attached to the other end of the bracket 17, that is, the horizontal piece 17b via the rubber cushion 16 and the stay 14 (FIGS. 2 and 6).

On the other hand, as shown in FIGS. 1 to 5, the rubber cushion 16 includes a pair of rubber cushion bodies 21,
21 and rubber connecting bands 22 and 22 connecting these cushion bodies 21 and 21. Connecting band 22,2
In this embodiment, two are provided in parallel with each other, and a pair of cushion bodies 21 and 21 and two connecting bands 22 and 2 are provided.
2 is integrally molded of rubber. The cushion body 21 has a through hole 1 formed in the horizontal piece 17b of the bracket 17.
7c is provided with a pair of bosses 21a, 21a that can be inserted from both sides of the bracket 17, respectively, and a pipe 23 and a cushion mounting bolt 24 that penetrate the cushion body 21 are provided at the centers of these bosses 21a, 21a. A through hole 21b that can be inserted is formed (FIGS. 1 and 3 to 5).

The boss 21a has a cylindrical base portion 21c having an outer diameter larger than the inner diameter of the through hole 17c, and a base portion 2c.
1c has a truncated cone portion 21d continuously provided at the tip (FIG. 1 (a)). The outer diameter D of the base portion 21c is formed to be larger than the inner diameter d of the through hole 17c of the bracket 17 by about 1 to 2 mm,
The base portion 21c is configured to be press fit into the through hole 17c. Further, the outer diameter of the base end of the truncated cone portion 21d is formed to be the same as the outer diameter of the base portion 21c, and becomes gradually smaller toward the tip, so that the outer diameter of the tip is smaller than the inner diameter of the through hole d.
Further, the two connecting bands 22 and 22 connect the pair of bosses 21a and 21a of the pair of cushion bodies 21 and 21 to the bracket 1.
The lengths are set so that the tension acts on the two connecting bands 22, 22 when they are inserted into the through holes 17c of No. 7 from both sides thereof (FIGS. 1, 2, 4, and 5).

The rubber cushion 1 constructed in this way
To assemble 6 to the bracket 17, first, the pair of cushion main bodies 21 and 21 are opposed to each other so that the pair of bosses 21a and 21a face each other, and the two connecting bands 22 and
The rubber cushion 16 is attached to the horizontal piece 1 of the bracket 17 so that both side edges of the horizontal piece 17b are sandwiched by 22.
It is inserted into 7b (FIG. 1 (a)). A pair of bosses 21a, 2
When 1a reaches the position facing the through hole 17c,
The truncated cone portion 21d is generated by the elastic force of the two connecting bands 22 and 22.
Is inserted into the through hole 17c, and the truncated cone portion 21d becomes the base portion 21c.
Guides the base portion 21c so as to face the through hole 17c. In this state, when the pair of cushion bodies 21 and 21 are pressed against each other in a direction of approaching each other, the base portions 21c and 21c are connected to the through holes 17c.
Are press-fitted into each (FIG. 1 (b), FIG. 4 and FIG. 5).
With such a relatively simple operation, the rubber cushion 16
Can be assembled to the bracket 17. In addition, the boss 21 a of the cushion body 21 is connected to the through hole 17 of the bracket 17.
Since the bosses 21a, 21a are further pressed into contact with the inner peripheral surface of the through hole 17c by the two connecting bands 22, 22, the bosses 21a, 21a are not separated from the through hole 17c. As a result, the rubber cushion 16 can be temporarily held in the state of being assembled to the bracket 17 without using an adhesive, so that the rubber cushion 16 can be transported to the assembly line in the state of being temporarily assembled to the bracket 17. Assembling workability is improved.

When the bracket 17 is conveyed to the assembly line in the temporarily assembled state, first, the vertical piece 17a of the bracket 17 is attached to the chassis frame 11 with the bolt 18 and the nut 19, and the through holes of the pair of cushion bodies 21, 21 are inserted. The pipe 23 is inserted into 21b and 21b, the disc 26 is placed on the upper surface of the upper cushion body 21, and the upper end of the stay 14 is brought into close contact with the lower surface of the lower cushion body 21. In this state, attach the cushion mounting bolt 24 to the stay 1.
4, through the cushion bodies 21, 21 and the disc 26,
A nut 27 is screwed onto the tip of the bolt 24 protruding from the disk 26 (FIGS. 1 (c) and 2). Exhaust pipe 1 like this
3 and muffler 12, stay 1 on chassis frame 11.
4, it can be assembled relatively easily through the rubber cushion 16 and the bracket 17. Further, when the engine is started, the vibration of the engine causes the exhaust pipe 13 and the muffler 12 to vibrate.
Although transmitted to the exhaust pipe 13, the vibration transmitted to the exhaust pipe 13 and the like is absorbed by the rubber cushion 16, so that the vibration is not transmitted to the chassis frame 11.

In the above embodiment, the pair of cushion bodies are connected by the two connecting bands, but they may be connected by one connecting band. In the above embodiment, the exhaust pipe and the muffler are attached to the chassis frame via the rubber cushion and the bracket, but either the exhaust pipe or the muffler may be attached to the chassis frame via the rubber cushion and the bracket. . Further, in the above embodiment, the exhaust pipe and the like are attached to the chassis frame which is the chassis through the rubber cushion and the bracket, but the exhaust pipe and the like may be attached to the lower surface of the floor panel which is the vehicle body through the rubber cushion and the bracket. Good.

[0014]

As described above, according to the present invention, the outer diameter of the base portion of the boss is formed larger than the inner diameter of the through hole of the mounted member, and the boss is formed into a cylindrical shape that can be press-fitted into the through hole. , The outer diameter of the base end of the truncated cone connected to the tip of the base of the boss is formed to be the same as the outer diameter of the base, and becomes gradually smaller toward the tip, and the outer diameter of the tip is smaller than the inner diameter of the through hole. Since it is formed small, the rubber cushion can be assembled to the mounted member by a relatively simple operation of press-fitting the boss of the cushion body into the through hole of the mounted member. Also, since the boss of the cushion body is press-fitted into the through hole of the attached member, it is difficult for the boss to separate from the through hole of the attached member, and the rubber cushion can be attached to the attached member without using an adhesive. Can be held temporarily. Further, since the pair of cushion bodies are connected by the connecting band, the number of parts does not increase, and the parts management can be prevented from becoming complicated.

Further, the connecting band is one or two, and when the pair of bosses of the pair of cushion main bodies are inserted into the through holes of the member to be attached from both sides, the connecting band is tensioned. When the length is set, the boss of the cushion body is press-fitted into the through hole of the attached member, and the boss is further pressed against the inner peripheral surface of the through hole by the connecting band. It becomes more difficult to leave from. Further, the attached member is a bracket for attaching the exhaust pipe or the like to the chassis or the like, and if one end of the bracket is attached to the chassis or the vehicle body and the exhaust pipe or the like is attached to the other end of the bracket through a pair of cushion bodies, the exhaust pipe or the like Can be relatively easily assembled to the chassis etc. via the rubber cushion and bracket, and the vibration of the engine transmitted to the exhaust pipe etc. is absorbed by the rubber cushion, so that the above vibration is transmitted to the chassis etc. There is no.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 2 showing a procedure for attaching a bracket via a rubber cushion according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a perspective view of the rubber cushion.

FIG. 4 is a perspective view showing a state where the rubber cushion is attached to a bracket.

5 is a view on arrow C of FIG.

FIG. 6 is a side view of a main part of a vehicle showing an exhaust pipe and a muffler mounted on a chassis frame via a rubber cushion and a bracket.

[Explanation of symbols]

11 Chassis frame (car chassis) 12 muffler 13 Exhaust pipe 16 rubber cushion 17 Bracket (attached member) 17c through hole 21 Cushion body 21a Boss 21b through hole 21c base 21d truncated cone 22 connection belt

Claims (3)

[Claims] 1. A through hole formed in a plate-shaped member to be attached (17)
A pair of bosses (21a, 21a) that can be inserted from both sides are projected in (17c), and through holes (21b, 21b) through which cushion mounting bolts (24) can be inserted are formed at the centers of the pair of bosses, respectively. Paired rubber cushion main bodies (21, 21) and a rubber connecting band (2) connecting the pair of cushion main bodies.
2, 22), wherein the boss (21a) has a cylindrical base portion (21c) having an outer diameter larger than the inner diameter of the through hole (17c) and press fit into the through hole. ), The outer diameter of the base end is formed continuously with the outer diameter of the base portion and is formed to be the same as the outer diameter of the base portion, and the outer diameter of the distal end becomes smaller than the inner diameter of the through hole (17c). A rubber cushion having a truncated cone portion (21d) formed small. 2. The connecting band (22) is one or two, and the pair of bosses (21a, 21a) of the pair of cushion bodies (21, 21) are connected to the through holes (17c) of the member to be attached (17). The rubber cushion according to claim 1, wherein the length of the connecting band is set so that tension acts on the connecting band (22) when inserted from both sides. 3. The attached member (17) is an exhaust pipe (13) or a muffler.
A bracket for mounting either or both of (12) on a chassis (11) or a vehicle body, one end of the bracket (17) being attached to the chassis (11) or the vehicle body, and the other end of the bracket (17) The rubber cushion according to claim 1 or 2, wherein either one or both of the exhaust pipe (13) and the muffler (12) are attached to a pair of cushion bodies (21, 21) via a pair.