JP2014173703A - Vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolation device in which strength of a shaft-shaped member can be increased.SOLUTION: When a vehicle travels and an engine E is excessively displaced with respect to a vehicle body 24 in a horizontal direction (arrow F direction), a shaft-shaped member 18 is bending-deformed between a bottom wall part 12A of a first connection member 12 and a base plate 30 of a second connection member 14, and an intermediate part of the shaft-shaped member 18 is brought into contact with an inner peripheral part of a second through-hole 36 of the second connection member 14. In a vibration isolation device 10 of the embodiment, the shaft-shaped member 18 is bending-deformed and receives a shear force in an interval between the base plate 30 of the second connection member 14 and the bottom wall part 12A of the first connection member 12, the interval being larger than an interval between a bottom wall part 32A of a conventional elastic body fastening plate 32 of the second connection member 14 and the bottom wall part 12A of the first connection member 12, so that the strength of the shaft-shaped member 18 of the embodiment is increased in comparison with the conventional shaft-shaped member 18.

Description

  The present invention relates to a vibration isolator and relates to a vibration isolator suitable for an engine mount that supports an automobile engine.

As a vibration isolator that supports an automobile engine, for example, there is a vibration isolator disclosed in Patent Document 1.
This anti-vibration device includes an upper connecting fitting 10 connected to the engine side, a lower connecting fitting 20 connected to the vehicle body frame side, and an anti-vibration device made of rubber connecting the upper connecting fitting 10 and the lower connecting fitting 20. One end side is fixed to the vibration base 30 and the upper connection fitting 10, and a stopper bolt 40 is provided as a shaft-like member whose other end is inserted and disposed in the through hole 22 b of the lower connection fitting 20.

  The stopper bolt 40 has one end fixed to the upper surface plate portion 12 of the upper connection fitting 10 and an intermediate portion fixed to the bottom plate portion 14 fixed to the lower side of the upper connection fitting 10.

JP2008-240999A.

However, in the above vibration isolator, the stopper bolt 40 of the upper connecting fitting 10 to which the engine is attached by an excessive input and the lower connecting fitting 20 attached to the vehicle body frame are excessive in the direction orthogonal to the axial direction of the stopper bolt 40. When it is displaced, the stopper bolt 40 collides with the lower connecting bracket 20, and the stopper bolt 40 is bent and deformed between two points of the bottom plate 14 and the lower connecting bracket 20.
Since the distance between the bottom plate portion 14 and the lower connection fitting 20 is shorter than the distance between the upper plate portion 12 and the lower connection fitting 20, it is bent between the bottom plate portion 14 and the lower connection fitting 20. The stopper bolt 40 to be formed has a large amount of deformation per unit length and a large stress is generated, so that the strength of the stopper bolt 40 may be lowered.

  In view of the above facts, the present invention aims to provide a vibration isolator capable of improving the strength of the shaft-shaped member.

  The vibration isolator according to claim 1 is connected to any one of the vibration generating portion and the vibration receiving portion, and has a first connecting member in which a first through hole is formed, and one end portion of the first connecting member. An elastic body connected to the first portion, a shaft-like member inserted through the first through hole with a space therebetween, and one end of the shaft-like member connected to one of the vibration generating portion and the vibration receiving portion. Is fixed to the first connecting member side of the base plate, and a second through hole is formed through which the shaft-like member is inserted with a space therebetween, and the other end of the elastic body is fixed. And a second connecting member configured to include an elastic body fixing plate.

  In the vibration isolator according to claim 1, one of the vibration generating unit and the vibration receiving unit is connected to the first connecting unit, and the base plate of the second connecting unit is one of the vibration generating unit and the vibration receiving unit. The vibration connected to the other and transmitted from the vibration generating unit to the vibration receiving unit is absorbed by the elastic body.

  The first connecting portion and the second connecting portion are greatly displaced in a direction orthogonal to the axial direction of the shaft-like member, and the first through-hole formed in the first connecting member and the first through-hole are formed in the first connecting member. Although the bending force acts on the shaft-like member by contacting the second through hole formed in the elastic body fixing plate of the two connecting members, the shaft-like member has the first connecting member and the second connecting member. The first connecting member and the second connecting member are not bent only between the elastic member fixing plate of the first connecting member and the elastic member fixing plate of the second connecting member. Since it is bent between the base plates of the connecting members, the amount of bending deformation per unit length of the shaft-like member can be reduced, and thereby the breaking strength of the shaft-like member can be improved.

  According to a second aspect of the present invention, in the vibration isolator according to the first aspect, the male screw formed on the shaft member is screwed into the female screw formed on the base plate, and the screw is further screwed on the male screw. The combined nut is in close contact with the base plate.

  In the vibration isolator according to claim 2, the male screw formed on the shaft member is screwed to the female screw formed on the base plate, and the nut screwed on the male screw is in close contact with the base plate. The shaft member and the base plate can be firmly fixed to each other.

  As described above, the vibration isolator according to claim 1 has an excellent effect that the strength of the shaft-like member can be improved.

  According to the vibration isolator of claim 2, the shaft member and the base plate can be firmly fixed to each other.

(A) is sectional drawing along the axis line of the shaft-shaped member of the vibration isolator which concerns on one Embodiment of this invention (1 (A) 1- (A) line | wire of the vibration isolator shown to FIG. 2 (A) (Cross-sectional view), (B) is a cross-sectional view of a vibration isolator according to an embodiment of the present invention in which the orientation is changed by 90 degrees from (A) (anti-vibration shown in FIG. 2 (B)) (1 (A) 1- (A) sectional view of the device) (A) is a front view of the vibration isolator which concerns on one Embodiment of this invention, (B) is a bottom view of the vibration isolator which concerns on one Embodiment of this invention. (A)-(C) are explanatory drawings which show the mode of a deformation | transformation of the conventional vibration isolator. (A)-(D) are explanatory drawings which show the mode of a deformation | transformation of the vibration isolator which concerns on embodiment of this invention.

Hereinafter, the vibration isolator 10 which concerns on one Embodiment of this invention is demonstrated using drawing.
As shown in FIG. 1, the vibration isolator 10 of the present embodiment includes a first connecting member 12 connected to a vehicle body B as a vibration receiving unit, and a second connecting member connected to an engine E of the vehicle. 14 includes an elastic body 16 for vibration absorption, a shaft-like member 18, and a nut 20 disposed between the first connecting member 12 and the second connecting member 14.

  The 1st connection member 12 is formed from the steel plate bent by the substantially U shape provided with 12 A of bottom wall parts arrange | positioned horizontally, and the vertical wall part 12B extended upwards from the both ends of 12 A of bottom wall parts. A circular first through hole 22 is formed in the center of the bottom wall portion 12A, and bolt insertion holes 28 for inserting bolts 26 to be attached to the vehicle body B are formed on both sides of the first through hole 22. ing.

  A second connecting member 14 is disposed above the first connecting member 12 with a gap therebetween. The second connecting member 14 includes a base plate 30 and an elastic body fixing plate 32 disposed on the lower side of the base plate 30.

The base plate 30 is formed from a flat steel plate and is disposed horizontally.
On the other hand, the elastic body fixing plate 32 is formed of a steel plate bent into a substantially U shape, and includes a bottom wall portion 32A that is horizontally disposed and a vertical wall portion 32B that extends upward from both ends of the bottom wall portion 32A. Yes.
In the elastic body fixing plate 32, the upper end portion of the vertical wall portion 32B is fixed to the lower surface of the base plate 30 by welding or the like.

The bottom wall portion 32 </ b> A corresponds to the middle portion in the longitudinal direction of the shaft-shaped member 18.
A second through hole 36 having a circular shape through which the shaft-like member 18 passes is formed in the center of the bottom wall portion 32A. Note that the shaft-shaped member 18 and the bottom wall portion 32A are separated from each other at normal times (the vehicle is stopped and the engine is stopped), and an annular gap S1 is formed between the shaft-shaped member 18 and the second through hole 36. Is formed.

  The first connecting member 12 and the second connecting member 14 are connected by an elastic body 16 such as rubber. The elastic body 16 is vulcanized and bonded to the first connecting member 12 and the second connecting member 14.

  A part of the elastic body 16 extends to the lower surface side of the bottom wall portion 12 </ b> A of the first connecting member 12 through the first through hole 22. A part of the elastic body 16 formed in the inner peripheral part of the first through hole 22 serves as a stopper 38 that contacts when the shaft-like member 18 is largely displaced.

  Note that the shaft-shaped member 18 and the stopper 38 are separated from each other during normal times (the vehicle is stopped and the engine is stopped), and an annular gap S <b> 2 is formed between the shaft-shaped member 18 and the stopper 38. The gap S2 is provided larger than the gap S1.

  As shown in FIGS. 1 and 2, a female screw 42 is formed in the center of the base plate 30, and bolt insertion holes 46 for inserting bolts 44 for attachment to the engine E are formed on both sides of the female screw 42. Is formed.

As shown in FIG. 1, a male screw 48 formed on one end side of the shaft-like member 18 is screwed into the female screw 42 of the base plate 30. One end of the shaft-shaped member 18 is deformed in the diameter-expanding direction so as not to loosen the screw portion (so-called caulking process). Further, a nut 20 is screwed onto the male screw 48, and the nut 20 is tightened so as to be crimped to the base plate (so-called double nut). Thereby, the shaft-shaped member 18 and the base plate 30 are firmly fixed.
Note that one end of the shaft-shaped member 18 does not protrude from the upper surface of the base plate 30.

  As shown in FIGS. 1 and 2, the other end of the shaft-shaped member 18 protrudes outward in the axial direction from the stopper 38, and a spanner (not shown) is engaged with the other end of the shaft-shaped member 18. A hexagonal head 50 is integrally formed.

(Function)
Next, the effect of the vibration isolator 10 of this embodiment is demonstrated in contrast with the conventional vibration isolator 100. FIG.
FIG. 3A shows a schematic configuration of a conventional vibration isolator 100. In the conventional vibration isolator 100, the same code | symbol is attached | subjected to the same structure as the vibration isolator 10 of this embodiment. In addition, in the conventional vibration isolator 100 shown in FIG. 3, illustration of some elastic bodies etc. is abbreviate | omitted.

  As shown in FIG. 3A, the conventional anti-vibration device 100 is characterized in that the axial intermediate portion of the shaft-shaped member 18 is fixed to the elastic body fixing plate 32 of the second connecting member 14. It is a different point from the vibration isolator 10 of a form.

  In the conventional vibration isolator 100, when the vehicle travels and the engine E is displaced in the horizontal direction (arrow F direction) with respect to the vehicle body 24, as shown in FIG. The base plate 30 and the elastic body fixing plate 32 are moved relative to the first connecting member 12 in the horizontal direction, and an intermediate portion of the shaft-like member 18 (the elastic body fixing plate 32 of the head 50 and the second connecting member 14). Between the bottom wall portion 32A of the first connecting member 12 and the inner peripheral portion of the first through hole 22 formed in the bottom wall portion 12A of the first connecting member 12 (actually, the illustration is omitted in FIG. 3). Contact the stopper 38).

  When the engine E is further greatly displaced, as shown in FIG. 3C, the shaft-shaped member 18 is located between the head 50 and the bottom wall portion 32A of the elastic body fixing plate 32 of the second connecting member 14. In addition to bending deformation, shear force acts. When an excessive displacement is applied, the crack X is finally generated in a portion where stress (bending deformation + shearing force) is concentrated, specifically, in the vicinity of the bottom wall portion 32A of the elastic body fixing plate 32 of the second connecting member 14. Produce.

  On the other hand, in the vibration isolator 10 of the present embodiment, the vehicle travels and the engine E is displaced in the horizontal direction with respect to the vehicle body 24 (in the direction of arrow F. The displacement amount is the same as that of the conventional vibration isolator 100). As shown in FIG. 4B, the second connecting member 14 moves relative to the first connecting member 12 in the horizontal direction, and an intermediate portion of the shaft-like member 18 (the head 50 and the second connecting member). The space between the member 14 and the base plate 30 first comes into contact with the inner peripheral portion of the first through hole 22 formed in the bottom wall portion 12 </ b> A of the first connecting member 12.

  When the engine E is further displaced (the displacement amount is the same as that of the conventional vibration isolator 100), the shaft-shaped member 18 is connected to the bottom wall of the first connecting member 12 as shown in FIG. Between the portion 12A and the base plate 30 of the second connecting member 14), and the intermediate portion of the shaft-shaped member 18 contacts the inner peripheral portion of the second through hole 36 of the second connecting member 14.

  In the conventional vibration isolator 100, the shaft-shaped member 18 is bent and deformed between the bottom wall portion 32 </ b> A of the elastic body fixing plate 32 of the second connecting member 14 and the bottom wall portion 12 </ b> A of the first connecting member 12. In contrast, in the vibration isolator 10 of the present embodiment, the shaft-like member 18 is connected to the bottom wall portion 32A of the elastic body fixing plate 32 of the conventional second connecting member 14 and the first connecting member 12. The base plate 30 of the second connecting member 14 having a larger distance than the distance from the bottom wall portion 12A of the second connecting member 14 is bent and deformed between the base wall 30A of the first connecting member 12 and the shearing force. The shaft-shaped member 18 of the vibration isolator 10 according to the embodiment is improved in strength as compared with the shaft-shaped member 18 of the conventional vibration isolator 100.

  Therefore, durability of the shaft-shaped member 18 of the vibration isolator 10 of the present embodiment is improved as compared with the shaft-shaped member 18 of the conventional vibration isolator 100.

  In the vibration isolator 10 of the present embodiment, when the engine E is further displaced, the shaft-shaped member 18 is further greatly deformed as shown in FIG.

  Further, in the vibration isolator 10 of the present embodiment, the base plate 30 attached to the engine E has a flat plate shape, and the shaft-shaped member 18 does not protrude from the base plate 30, so that the overall height is lowered compared with the conventional vibration isolator. Can do.

[Other Embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

The vibration isolator 10 of the above embodiment can be used upside down.
Moreover, although the vibration isolator 10 of the said embodiment demonstrated the example used for the mount of an engine, it can also be used for the other use of a cab mount.

DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 1st connection member 14 2nd connection member 16 Elastic body 18 Shaft-shaped member 20 Nut 22 1st through-hole 30 Base plate 32 Elastic body adhering plate 36 2nd through-hole 42 Female screw 48 Male screw

Claims (2)

A first connecting member connected to any one of the vibration generating portion and the vibration receiving portion and having a first through hole;
An elastic body having one end connected to the first connecting portion;
A shaft-like member that is inserted through the first through hole at an interval;
A base plate connected to one of the vibration generating portion and the vibration receiving portion to which one end of the shaft-like member is fixed, and joined to the first connecting member side of the base plate, and the shaft-like member is inserted with a gap. A second connecting member that includes an elastic body fixing plate in which a second through hole is formed and the other end of the elastic body is fixed;
A vibration isolator. 2. The vibration isolation device according to claim 1, wherein a male screw formed on the shaft member is screwed with a female screw formed on the base plate, and a nut screwed on the male screw is in close contact with the base plate. apparatus.

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