JP2013231469A - Anti-vibration mount device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-vibration mount device capable of reducing a spring constant in a right-left direction while suppressing reduction of a spring constant in a vertical direction.SOLUTION: An exhaust pipe support device 1 is provided with a bracket 13 attached and fixed to a lower surface of a vehicle body 9, and an elastic member 15 which is arranged in the bracket 13, is connected to the bracket 13 such that a connection member attachment part 15a having an attachment hole 15c for attaching a connection member connected to an exhaust pipe 7 and a base end are connected to both side parts of the connection member attaching part 15a, and a front end is extended to incline downward toward a side from both sides of the connection member attaching part 15a, and which is comprised of a rubber elastic body having a pair of elastic leg parts 15b, 15b supporting the connection member attaching part 15a, in the bracket 13, and a base end part center 15f is located at an upper side than a horizontal right-left direction center line X2 passing through an attachment hole center C.

Description

  The present invention relates to an anti-vibration mount device that is disposed between a support and a supported body, suspends the supported body from the support, and prevents vibrations of the supported body from being transmitted to the support. Is.

  Patent Document 1 discloses an exhaust pipe support device that supports a vehicle exhaust pipe suspended from a vehicle body. The exhaust pipe support device includes a hat-shaped bracket that is fixedly attached to the lower surface of the vehicle body, an attachment portion through which an attachment hole is formed, and an attachment portion and a bracket that extend so as to incline downward from both sides of the attachment portion. And a pair of elastic legs. The connecting member that connects the exhaust pipe support device and the exhaust pipe has one end connected to the exhaust pipe and the other end inserted through the mounting hole of the mounting portion.

Japanese Patent No. 3931053 (pages 3, 4 and 1)

  By the way, in recent years, from the viewpoint of improving the NHV performance of a vehicle, there is an increasing demand for reducing the spring constant in the left-right direction in the exhaust pipe support device. On the other hand, the exhaust pipe support device is required to have the same spring constant in the vertical direction and the horizontal direction.

  As a measure for reducing the spring constant in the left-right direction with the exhaust pipe support device of Patent Document 1, it is conceivable to make the elastic leg portion thinner. However, in this case, although the spring constant in the left-right direction decreases, there is a problem that the spring constant in the vertical direction decreases more than necessary.

  The present invention has been made in view of such a point, and an object thereof is to provide a vibration-proof mount device capable of reducing the spring constant in the left-right direction while suppressing the reduction in the spring constant in the up-down direction. It is to provide.

  In order to achieve the above object, the present invention devise the position of the base end portion of the elastic leg portion.

  Specifically, the present invention includes a bracket that is fixedly attached to a support, a connecting member mounting portion that is disposed in the bracket and has a mounting hole for connecting a connecting member that is connected to a supported body, and a base end. It is connected to both sides of the connecting member mounting portion and the tip extends from both sides of the connecting member mounting portion so as to incline downward toward the side and is connected to the bracket, and the connecting member mounting portion is connected to the bracket. The following solution was taken for an anti-vibration mount device provided with an elastic member made of a rubber elastic body having a pair of supporting elastic legs.

  The present invention is characterized in that the position of the center in the vertical direction of the base end of the elastic leg is above the horizontal center line passing through the center of the mounting hole.

  In the anti-vibration mount device of the present invention, when the supported body vibrates, the connecting member vibrates, and the connecting member mounting portion is shaken, one elastic leg is stretched by the connecting member mounting portion and is extended to the maximum. The base end portion of this elastic leg portion does not move, but the connecting member mounting portion moves to the other elastic leg portion side by the inertial force. At this time, since the vertical center of the base end is above the horizontal center line passing through the center of the mounting hole, a rotational moment centered on the vertical center is generated in the connecting member mounting part. The connecting member mounting portion is rotated by the moment. Then, the other elastic leg part curves upward and is difficult to be compressed. Therefore, the spring constant in the left-right direction of the vibration-proof mount device can be reduced. Therefore, by maintaining the elastic leg portion at the conventional thickness, the spring constant in the left-right direction can be reduced while suppressing the reduction in the spring constant in the vertical direction.

It is a front view which shows the state which attached the exhaust pipe support apparatus which concerns on 1st Embodiment of this invention to the vehicle body. It is a figure which shows the calculation model of the simulation which investigated the spring characteristic of the exhaust pipe support apparatus, (a) is a figure which shows a linear model, (b) is a figure which shows a 1/4 upper model, (c ) Is a diagram showing a 1/2 upper model, (d) is a diagram showing a 1/1 upper model, and (e) is a diagram showing a 3/2 upper model. (A) is an image diagram in the linear model, (b) is an image diagram in the 1/4 upper model, and (c) is an image diagram showing the deformation of the connecting member mounting portion and the elastic leg portion in each calculation model. It is an image figure in a 1/2 upper model, (d) is an image figure in a 1/1 upper model, and (e) is an image figure in a 3/2 upper model. It is a figure which shows the spring characteristic obtained by the simulation which investigated the spring characteristic of the exhaust pipe support apparatus. It is sectional drawing of the engine mount which concerns on 2nd Embodiment of this invention. 2A is a view corresponding to FIG. 2A in the engine mount, FIG. 2B is a view corresponding to FIG. 2E in the engine mount, and FIG. 2C is obtained by a simulation examining the spring characteristics of the engine mount. It is a figure which shows the spring characteristic. It is a front view of the engine mount concerning other embodiments.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

(First embodiment)
In the present embodiment, a description will be given of an application of the vibration-proof mount device according to the present invention to an exhaust pipe support device that supports a vehicle exhaust pipe suspended from a vehicle body.

  FIG. 1 is a front view showing a state in which an exhaust pipe support device (anti-vibration mount device) 1 according to the present embodiment is attached to a vehicle 3. The exhaust pipe support device 1 is disposed between an exhaust pipe (supported body) 7 and a vehicle body (support body) 9 extending in the vehicle longitudinal direction in the vicinity of the silencer 5. The exhaust pipe support device 1 is attached to the vehicle body 9 and supports the exhaust pipe 7 in a suspended manner on the vehicle body 9. A circular rod-shaped connecting member 11 is disposed between the exhaust pipe support device 1 and the exhaust pipe 7, one end 11 a of the connection member 11 is connected to the exhaust pipe support device 1, and the other end 11 b is connected to the exhaust pipe 7. It is connected. In FIG. 1, the silencer 5, the exhaust pipe 7, the vehicle body 9, and the connecting member 11 are indicated by phantom lines.

  The exhaust pipe support device 1 includes a hat-shaped bracket 13 that is attached and fixed to the lower surface of the vehicle body 9, and an elastic member 15 that is disposed in the bracket 13.

  The bracket 13 is formed by bending a rectangular steel plate, and includes a bottom wall portion 13a, a pair of side wall portions 13b and 13b extending upward from the left and right ends of the bottom wall portion 13a, and an upper end of each side wall portion 13b. And an upper wall portion 13c extending outward in the vehicle width direction. The upper wall portion 13c is fixed by welding to a flat steel plate 17, for example, and the steel plate 17 is bolted to the lower surface of the vehicle body 9. Thus, the bracket 13 is fixedly attached to the lower surface of the vehicle body 9 via the steel plate 17.

  The elastic member 15 is made of a rubber elastic body, and includes a connecting member attaching portion 15a to which the one end 11a of the connecting member 11 is attached, and a pair of elastic leg portions 15b and 15b that support the connecting member attaching portion 15a. Yes.

  The connecting member attachment portion 15a has a rectangular parallelepiped shape, and a circular attachment hole 15c penetrating in the vehicle front-rear direction is formed at the center portion thereof. One end 11a of the connecting member 11 is inserted into the mounting hole 15c so as to be rotatable in the circumferential direction. The pair of elastic legs 15b and 15b are quadrangular prisms, and symmetrical with respect to a vertical center line X1 extending in the vertical direction passing through the center C of the mounting hole 15c, which is the center of the connecting member mounting portion 15a. It is arranged. Each elastic leg portion 15b has a base end connected to the vehicle width direction side portion 15d of the connecting member mounting portion 15a and a distal end inclined downward from both sides in the vehicle width direction of the connecting member mounting portion 15a. And is connected to the side wall portion 13 b of the bracket 13. The position of the vertical center (hereinafter referred to as the base end center) 15f of the base end portion 15e of the elastic leg portion 15b is above the horizontal center line X2 extending through the center C of the mounting hole 15c and extending horizontally. is there.

  When the exhaust pipe 7 vibrates, the connecting member 11 vibrates, and the connecting member mounting portion 15a shakes, one elastic leg portion 15b is pulled and extended by the connecting member mounting portion 15a. The base end portion 15e of the leg portion 15b stops moving, and the connecting member attaching portion 15a moves to the other elastic leg portion 15b side by inertial force. Then, since the base end portion center 15f is located above the center line X2 in the left-right direction, a rotation moment about the base end portion center 15f is generated in the connecting member mounting portion 15a. When the connecting member mounting portion 15a is rotated by this rotational moment, the other elastic leg portion 15b is curved upward and is not easily compressed. Therefore, the spring constant k1 in the left-right direction of the exhaust pipe support device 1 can be reduced. Therefore, by maintaining the elastic leg portions 15b and 15b at the conventional thickness, the spring constant k1 in the left-right direction can be reduced while suppressing the reduction in the spring constant k2 in the vertical direction.

  Next, the simulation of the deformation state of the connecting member attaching portion 15a and the pair of elastic leg portions 15b and 15b and the results thereof will be described.

  FIG. 2 is a calculation model of the connecting member mounting portion 15a and the elastic leg portions 15b and 15b in which the position of the base end portion 15e is changed. FIG. 2A shows the base end portion centers 15f and 15f with respect to the horizontal center line X2. (B) is a linear model positioned on the line, and the base end centers 15f and 15f are positioned 1/4 above the vertical width ¼ of the base end portions 15e and 15e with respect to the horizontal center line X2. (C) is a ½ upper model in which the base end centers 15f and 15f are located above the vertical width ½ of the base end portions 15e and 15e with respect to the horizontal center line X2. , (D) is a 1/1 upper model in which the base end centers 15f, 15f are located above the base end portions 15e, 15e by the vertical width of the base end portions 15e, 15e, and (e) is the base end. The center 15f, 15f is the base end 15e, 1 than the center line X2 in the left-right direction. A 3/2 upper model is located in the vertical width 3/2 upper e. In each calculation model, the connecting member mounting portion 15a and the elastic leg portions 15b and 15b are made of the same material. In the five calculation models, the elastic legs 15b and 15b have the same thickness and inclination angle. FIG. 3 shows the connecting member mounting portion 15a and the elastic leg when the one end 11a of the connecting member 11 inserted through the mounting hole 15c so as to be rotatable in the circumferential direction in each calculation model of FIG. 2 is moved to the right side of FIG. It is an image figure which shows the deformation | transformation of 15b, 15b. FIG. 4 is a graph showing the spring constant k1 (N / mm) in the left-right direction, the spring constant k2 (N / mm) in the vertical direction, and the ratio k1 / k2 between them in each calculation model of FIG. In FIG. 4, the spring constant k1 (N / mm) in the left-right direction is represented by a rhombus, the spring constant k2 (N / mm) in the vertical direction is represented by a square, and the ratio k1 / k2 between them is represented by an equilateral triangle. ing. The calculation is performed using general-purpose finite element software under the condition that one end 11a of the connecting member 11 that restrains the tip end portions of the elastic leg portions 15b and 15b and passes through the mounting hole 15c is moved to one side in the left-right direction with a predetermined load. It was performed using.

  As shown in FIG. 3, in the linear model, the connecting member mounting portion 15a does not rotate around the base end portion 15e and the right elastic leg portion 15b is compressed, but in other calculation models, the connecting member mounting portion 15a is compressed. Rotates clockwise and the right elastic leg 15b is curved upward. As shown in FIG. 4, in the calculation model other than the linear model, the spring constant k1 (N / mm) in the left-right direction is suppressed while suppressing the reduction in the vertical spring constant k2 (N / mm) as compared with the linear model. Reduced. Furthermore, the spring constant k1 (N / mm) in the left-right direction decreased as the connecting portion 15e was positioned on the upper side. As described above, in the calculation models of FIGS. 2B to 2E corresponding to the present invention, the spring constant k1 (N / mm) in the horizontal direction is maintained while maintaining the spring constant k2 (N / mm) in the vertical direction to the same level as the conventional example. N / mm) was confirmed to decrease.

(Second Embodiment)
In the first embodiment, the example in which the vibration-proof mount device of the present invention is applied to the exhaust pipe support device has been described. However, the present invention is not limited to this, and may be applied to, for example, an engine mount. The engine mount 19 according to the present embodiment will be described with reference to FIGS. FIG. 5 is a front view of the engine mount 19 according to the present embodiment. FIG. 6 is a diagram showing a calculation model and a calculation result when the vibration-proof mount device of the present invention is applied to an engine mount. The configuration other than the elastic member 21 and the inner cylinder 23 is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and description thereof is omitted.

  The elastic member 21 is made of a rubber elastic body, and includes an inner cylinder attachment portion 21a to which the inner cylinder 23 fixed to the power unit is attached, and a pair of elastic leg portions 21b and 21b that support the inner cylinder attachment portion 21a. I have.

  The inner cylinder mounting portion 21a has a rectangular parallelepiped shape, and a circular mounting hole 21c penetrating in the vehicle front-rear direction is formed at the center thereof. The cylindrical inner cylinder 23 is inserted and fixed integrally in the mounting hole 21c. Therefore, the inner cylinder 23 is attached to the attachment hole 21c so as not to rotate in the circumferential direction. The pair of elastic legs 21b, 21b are quadrangular prisms, and are symmetrical with respect to a vertical center line X1 extending in the vertical direction passing through the center C of the mounting hole 21c, which is the center of the inner cylinder mounting portion 21a. It is arranged. Each elastic leg portion 21b has a base end connected to a vehicle width direction side portion 21d of the inner cylinder mounting portion 21a and a distal end inclined downward from both sides of the inner cylinder mounting portion 21a in the vehicle width direction. And is connected to the side wall portion 13 b of the bracket 13. The position of the vertical center (hereinafter referred to as the base end center) 21f of the base end portion 21e of the elastic leg 21b is above the horizontal center line X2 that passes through the center C of the mounting hole 21c and extends horizontally. is there.

  When the power unit vibrates and the inner cylinder 23 vibrates and the inner cylinder mounting portion 21a is shaken, one elastic leg portion 21b is pulled and extended by the inner cylinder mounting portion 21a. The base end part 21e of 21b stops moving, and the inner cylinder attaching part 21a moves to the other elastic leg part 21b side by an inertial force. Then, since the base end center 21f is on the upper side with respect to the center line X2 in the left-right direction, a rotation moment centered on the base end center 21f is generated in the inner cylinder mounting portion 21a. When the inner cylinder mounting portion 21a is rotated by this rotational moment, the other elastic leg portion 21b is curved upward and is not easily compressed. Therefore, the spring constant k1 in the left-right direction of the engine mount can be reduced. Therefore, by maintaining the elastic leg portions 21b and 21b with the conventional thickness, the spring constant k1 in the left-right direction can be reduced while suppressing the reduction in the spring constant k2 in the vertical direction.

  Next, the simulation of the deformation | transformation state of the inner cylinder attaching part 21a and a pair of elastic leg part 21b, 21b and its result are demonstrated. 6 (a) is a diagram corresponding to FIG. 4 (a), FIG. 6 (b) is a diagram corresponding to FIG. 4 (e), and FIG. 6 (c) is a graph in each calculation model of (a) and (b). It is a graph which shows the spring constant k1 (N / mm) of the left-right direction, the spring constant k2 (N / mm) of the up-down direction, and ratio k1 / k2 of both. In FIG. 6C, the spring constant k1 (N / mm) in the left-right direction is represented by a cross mark, the spring constant k2 (N / mm) in the vertical direction is represented by a line segment, and the ratio k1 / k2 between the two is It is represented by a circle. The calculation was performed by the same method under the same conditions as in the above embodiment. As a result, as shown in FIG. 6C, it was confirmed that the spring constant k2 (N / mm) in the left-right direction was reduced while suppressing the reduction in the spring constant k1 (N / mm) in the vertical direction. It was also confirmed that the spring constant k1 (N / mm) in the vertical direction can be maintained at the same level as the conventional one.

(Other embodiments)
In the above embodiment, the vibration-proof mount device of the present invention is applied to the exhaust pipe support device and the engine mount of the above embodiment, but is not limited to this, for example, an engine mount as shown in FIG. 25 may be sufficient. In the engine mount 25, an inner cylinder 29 is inserted and fixed in an elastic member 27, and the elastic member 27 is fixed in a bracket 28. The base end center 27f of each elastic leg 27b is above the horizontal center line X2. Further, for example, an engine mount 31 as shown in FIG. The engine mount 31 includes an inner cylinder 33 and a cylindrical outer cylinder 35 that surrounds the outer side of the inner cylinder 33, and an elastic member 37 connects the inner cylinder 33 and the outer cylinder 35. And the front-end | tip part of each elastic leg part 37b is connected with the outer peripheral surface of the outer cylinder 35, and the base end part center 37f exists above the horizontal direction center line X2. Thus, the inner cylinder 33, the outer cylinder 35, and the elastic member 37 are press-fitted into the cylindrical portion of the bracket 39 having a cylindrical portion.

  Moreover, in the said embodiment, although elastic leg part 15b, 27b, 37b was linear, it is not limited to this shape, For example, a front-end | tip part may be thicker than a base end part.

  As described above, the anti-vibration mount device according to the present invention can be applied to applications that can reduce the spring constant in the left-right direction while suppressing the reduction in the spring constant in the vertical direction.

1 Exhaust pipe support device (anti-vibration mount device)
7 Exhaust pipe (supported body)
9 Body (support)
13 Bracket 15 Elastic member 15a Connecting member attachment portion 15b Elastic leg portion 15c Attachment hole 15e Base end portion 15f Base end portion center (vertical direction center of the base end portion)
19 Engine mount (anti-vibration mount device)
21 Elastic member 21a Inner cylinder attaching part 21b Elastic leg part 21c Attachment hole 21e Base end part 21f Base end part center (vertical direction center of the base end part)
C Mounting hole center (center of mounting hole)
X2 Horizontal center line (horizontal center line passing through the center of the mounting hole)

Claims (1)

A bracket to be attached and fixed to the support;
A connecting member mounting portion and a base end which are disposed in the bracket and have a mounting hole for connecting a connecting member connected to a supported body are connected to both side portions of the connecting member mounting portion, and a distal end is attached to the connecting member. An elastic member made of a rubber elastic body having a pair of elastic legs that extend from the both sides of the portion so as to incline downward toward the side and are connected to the bracket and support the connecting member mounting portion on the bracket. An anti-vibration mount device comprising:
The anti-vibration mount device, wherein a position of a center in a vertical direction of a base end portion of the elastic leg portion is above a horizontal center line passing through a center of the mounting hole.