JP2002070547A - Supporting device for exhaust pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft center orthogonal type supporting device for a exhaust pipe capable of using in a relatively narrow space and obtaining an optimum shape satisfying durability and characteristics. SOLUTION: A first holding part 1 having a through hole 1a into which a car body side supporting material is inserted and a second holding part 2 having a through hole 2a into which an exhaust pipe side supporting material is inserted, made of a rubber elastic material are continuously arranged so that a space 3 is formed with right and left arm parts 4, 4 and both axis centers are made orthogonal. The arm parts 4, 4 are extended from the both ends of the first holding part 1 in a bent shape so as to envelope the side of the second holding part 2 through the space 3, connected in almost a ring shape, and the second holding part 2 is brought into contact with a connecting part 5 of the arm parts 4, 4 facing the holding part 1, and installed in the ring-shaped inner part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pipe supporting device for supporting an exhaust pipe of an automobile on a vehicle body in a vibration-proof manner.

[0002]

2. Description of the Related Art Conventionally, as a supporting device for supporting an exhaust pipe on a vehicle body in a vibration-proof manner, a through hole into which a supporting material on the vehicle body side is inserted is made of a rubber elastic body. The first holding portion having the first holding portion and the second holding portion having a through hole into which the support material on the exhaust pipe side is inserted are connected by left and right arm portions with their axes parallel to each other and vertically spaced. In general, a generally oval ring is used (for example, Japanese Utility Model Laid-Open No. 4-117237). However, due to problems such as the vehicle body structure and the mounting space, there are cases where the above-mentioned substantially elliptical and axially parallel type support device cannot be used.

[0003] Therefore, due to structural problems such as mounting space, a holding portion having a through hole through which a support member on the vehicle body side is inserted and a holding portion having a through hole through which a support member on the exhaust pipe side is inserted. In addition, there has been proposed a support device in which the axial centers of both through holes are arranged in an orthogonal direction (for example, Japanese Utility Model Laid-Open No. 2-1).
No. 43324).

[0004] The present applicant has also started research and development of a support device of an axis center orthogonal type that can be used in a relatively small space. As an example, a first holding portion (101) having a through hole (101a) through which a support material on the vehicle body side is inserted, and a through hole through which a support material on the exhaust pipe side is inserted, as shown in FIG. (102
a) with the second holding portion (102) having the gap (1).
The use of a support device (110) arranged so that the axes are perpendicular to each other via the third line was studied.

[0005] Even in the case of such a supporting device, it is desired to maintain the same performance as that of the above-mentioned elliptical type device in terms of vibration isolation characteristics and durability.

However, the supporting device (11) shown in FIG.
0), both arms (104) (10) extending from both axial ends of the first holding portion (101) toward the second holding portion (102).
4) is short and connected to both sides of the holding portion (102).
Therefore, in a state in which the exhaust pipe is suspended and supported with the second holding portion (102) on the lower side, the spring constant in the vertical direction increases, and even if a certain degree of durability is obtained, vibration and noise are reduced. It is not satisfactory in terms of characteristics such as effects. In addition, the strain rate in the displaced state increases, and there is room for improvement in durability.

[0007] In view of the above, the present invention has made further studies on the shape and shape of the support device of the axis orthogonal type in a displaced state, and as a result, the support device can be used in a relatively narrow space and is durable. The present invention has been made based on the finding of an optimum shape that can sufficiently satisfy the performance and the anti-vibration characteristics.

[0008]

According to the present invention, there is provided an exhaust pipe supporting apparatus for solving the above-mentioned problems, comprising: a holding portion made of a rubber elastic body and having a through-hole into which a supporting material on a vehicle body side is inserted; And a holding portion having a through hole into which the support material is inserted,
An exhaust pipe support device in which a pair of left and right arms has an air gap and their axial centers are connected so as to be orthogonal to each other, wherein the pair of arms are arranged in an axial direction of the one holding portion. And extends in a curved shape so as to surround the side of the other holding portion from both end portions thereof and is connected to form a substantially ring shape, and the other holding portion faces the one holding portion. It is characterized in that it is provided on the ring-shaped inner portion so as to be connected to the connecting portion side of the both arm portions.

According to this exhaust pipe support device, both arms connecting one holding portion and the other holding portion are curved and long so as to surround the side of the other holding portion. Accordingly, the spring constant in the distance direction between the one holding portion and the other holding portion, that is, the spring constant in the vertical direction in a state in which the exhaust pipe is suspended and supported, can be reduced, thereby meeting the demands in use. The obtained anti-vibration characteristics can be obtained. Moreover,
Due to the above-described unique form, even in a relatively large displacement state, the strain rate and stress generated in the arm and the like are reduced, and the durability can be improved accordingly.

In the exhaust pipe support device, a gap between the other holding portion and the pair of arms surrounding the side thereof surrounds at least a half or more of the other holding portion. It is preferable that the connecting portion between the other holding portion and the both arm portions has a constricted shape. As a result, the spring constant can be reduced as described above, and the distortion rate in the displaced state can be reduced.

Further, when the pair of arms have a substantially elliptical ring shape, the arms can be lengthened even if the distance between the axes of both holding portions is reduced, and the spring constant can be reduced. In addition, the distortion rate in the displaced state is reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the embodiments shown in the drawings.

FIG. 1 is a front view showing one embodiment of an exhaust pipe supporting apparatus according to the present invention, FIG. 2 is a cross-sectional view taken along line XX of the previous figure, and FIG. 3 is a front view showing another embodiment of the present invention. FIG. 4 is a perspective view showing a state in which a supporting member is inserted through the supporting device.

In the drawing, reference numeral (10) denotes an exhaust pipe support device according to the present invention, which is integrally formed of a rubber elastic body and has a through-hole (1a) through which a rod-shaped support member (11) on the vehicle body side is inserted. ), And a second holding portion (2) having a through hole (2a) through which a rod-shaped support member (21) on the exhaust pipe side is inserted. Through holes (1a) (2a)
A predetermined gap (3) such that the axes of
And are continuously provided by a pair of left and right arms (4) and (4). That is, the first holding unit (1)
Has a cylindrical shape in which the through-hole (1a) extends in the lateral direction with substantially the same diameter, and the through-hole (2a) in the second holding portion (2) has the same diameter and penetrates in the thickness direction. I have.

The through hole (1a) of the first holding portion (1)
In order to facilitate the operation of inserting the support member (11), both open end portions can be formed to have a gradually enlarged diameter as shown in FIG.

The pair of arms (4) and (4) are separated from the one of the holding portions, for example, the portions at both axial ends of the upper first holding portion (1) having a substantially cylindrical shape as shown in the figure. The second holding portion (2) is formed in a predetermined curved shape so as to continuously surround the holding portion (2) toward the other second holding portion (2) (downward in the figure). It extends farther (downward) than the axis of 2), and its ends are connected to each other to form a substantially ring shape. The arm portions (4) and (4) are curved on both sides so as to protrude outward from both ends in the axial direction of the first holding portion (1), and the through holes (1a) shown in FIG. And a substantially elliptical ring shape. Further, the inner periphery of the arms (4) and (4) has a curved shape continuously from the vicinity of the central portion of the first holding portion (1) in a curved shape. It is formed so that large distortion and stress are not generated. In the case of the drawing, the arms (4) and (4) are connected so as to form a concave portion (6) on the lower surface side of the connecting portion (5).

The second holding portion (2) is connected to the connecting portion (5) of the arms (4) and (4) so as to be located in the ring-shaped inner portion. ing. A gap (3) between the other holding part (2) and the pair of arms (4) and (4) surrounding the outside of the other holding part (2) is at least half of the second holding part (2) (for example, As seen from the side of the first holding portion (1), the holding portion extends farther from the axial center position of the holding portion (2), that is, below, so as to surround substantially 3/4) as shown in the drawing.
A connecting portion (7) between the holding portion (2) and both arms (4) (4)
Has a constricted shape. The width (W) of this connecting portion (7)
2) can be determined in consideration of strength and elasticity in use.

The size of the curved curve of the arms (4) and (4) is determined by the dimension between the axes of the first holding part (1) and the second holding part (2), The thickness is appropriately set depending on the thickness of the portion (4), the outer dimensions of the second holding portion (2), the size of the gap (3), and the like.

The size of the support device (10) varies depending on the type of vehicle used, the form of supporting the exhaust pipe, and the like. One example is the dimension between the axes of the first and second holding portions (1) and (2). (S) is 26 mm, the diameter of both through holes (1a) and (2a) is 11.5 mm, the axial length (width) (W1) (W1) of the first holding portion (1) is 44 mm, and the maximum width ( W0) is 54
mm, axial dimension (thickness) of the second holding part (2)
(T) is 25 mm, and the vertical dimension (H) is 55 mm.

In the exhaust pipe supporting device (10) of the present invention configured as described above, for example, as shown in the drawing, the first holding portion (1) is placed on the upper side, and the through-hole (1a) of the exhaust pipe supporting device is provided on the vehicle body side. The support member (11) is inserted, and the support member (21) connected to the exhaust pipe is inserted into the through hole (2a) of the lower second holding portion (2), and the exhaust pipe is suspended. Use in support of

Although not shown in the drawings, the first holding part (1) and the second holding part (2) can be used upside down, or the two holding parts (1) (2) can be used. ) Can be implemented by reversing the form of connection by the arms (4) and (4).

In use in the above-mentioned suspended and supported state, the lower second holding portion (2) is moved in the far and near directions with respect to the first holding portion (1) due to a hanging load or a vertical vibration load. (Up and down), but both holding parts (1) (2)
Even if the distance between the axis centers of the two is relatively small, the two arms (4) and (4) connecting the two holding parts (1) and (2) become curved and long as described above. Therefore, the vertical spring constant is smaller than that of the embodiment of FIG.
Excellent vibration and noise reduction effect, ensuring required characteristics. In addition, because of the configuration of the support device (10) described above, that is, the configuration in which the second holding portion (2) is arranged in the ring-shaped inner portion of the both arms (4) and (4), The strain rate and stress are also reduced. That is, durability can be improved.

When a displacement exceeding a certain value occurs,
The both arms (4) (4) abut against both sides of the second holding part (2) located inside thereof, thereby performing a stopper function of restricting further large displacement.

Further, according to the form of the support device (10), the spring constant against the roll can be reduced, and when a large lateral displacement occurs, the side of the second holding portion (2) can be reduced. When the portion comes into contact with the arm portion (4), the portion also functions as a stopper.

Although not shown in the drawings, the first holding part (1) and the second holding part (2) may be used upside down, or the two holding parts (1) (2) may be used. ) Can be implemented by reversing the form of connection by the arms (4) and (4).

[FEM Analysis of Support Device Configuration]
A finite element method (Finte Element Analysis) is used for the above-mentioned example product of the present invention (FIG. 1) and the comparative example product in the form of FIG.
Method (hereinafter referred to as FEM analysis), the first holding portion is fixed on the upper side and fixed, and the load-deflection characteristic when a downward load (P) is applied to the second holding portion. And a deformed shape were compared by simulation.

In this FEM analysis, the product of the example and the product of the comparative example are assumed to be made of rubber materials having the same physical properties. The distance (S) between the axes of the first and second holding portions (101) and (102) is 26 mm, and the through holes (101a) and (102a) of both the holding portions (101) and (102) are provided.
Are each 11.5 mm in diameter, the axial length (width) (W1) of the first holding portion (101) is 44 mm, and the second holding portion is 101 mm.
(102) had an axial dimension (T) of 25 mm and a vertical dimension (H) of 52 mm.

FIG. 6 shows the load-deflection characteristics of the example product and the comparative example product obtained by simulation by FEM analysis, and FIG. 7 shows a deformed shape. As a result of this analysis, the results shown in Table 1 below were obtained.

Note that the spring constant is calculated by comparing the load-
It was calculated from the deflection characteristic based on the range of 4 to 6 mm where the characteristic was linear. The distortion rate affecting the durability was calculated from the analysis results for the portions A and B in FIGS. 1 and 5. 7 show the front and side halves, respectively.

[0030]

[Table 1]

As described above, the product of the example of the present invention has a lower spring constant than the product of the comparative example, and at the same displacement, the strain rate is about 1/2. It is advantageous in durability, and has almost the same strain rate and the same durability even under the same load.

[0032]

As described above, according to the exhaust pipe support device of the present invention, the shaft center orthogonal type which can be used even in a relatively narrow space can satisfy the performance such as vibration proof characteristics and durability. It will be.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line XX of the previous figure.

FIG. 3 is a front view showing another embodiment of the present invention.

FIG. 4 is a perspective view showing a state in which a support member is inserted into the support device of the above.

FIG. 5 is a front view (a) and a side view (b) illustrating a support device of a comparative example.

FIG. 6 is a load-deflection characteristic diagram obtained by FEM analysis.

FIG. 7 is a diagram of a deformed shape by simulation of FEM analysis.

[Explanation of symbols]

 (1) First holding part (2) Second holding part (1a) (2a) Through hole (3) Void (4) (4) A pair of arms (5) Connecting part (6) Recess (7) Articulation

Claims (3)

[Claims] 1. A pair of left and right holding portions each formed of a rubber elastic body and having a through hole into which a support member on the vehicle body side is inserted, and a holding portion having a through hole into which a support member on the exhaust pipe side is inserted. An exhaust pipe support device having a gap provided by an arm portion and an axial center continuously connected to each other so as to be orthogonal to each other, wherein the pair of arm portions is disposed at both axial ends of the one holding portion. And extends in a curved shape so as to surround the side of the other holding portion from the portion and is connected to form a substantially ring shape,
The exhaust pipe support device, wherein the other holding part is connected to a side of the connecting part of the both arms facing the one holding part and is provided in the ring-shaped inner part. 2. A gap between the other holding portion and the pair of arms surrounding the side thereof surrounds at least a half or more of the other holding portion. 2. The exhaust pipe support device according to claim 1, wherein the connecting portion with the arm portion has a constricted shape. 3. The exhaust pipe support device according to claim 1, wherein the pair of arms have a substantially elliptical ring shape.