JPH11141612A - Vibration isolating mount, and spring constant adjusting method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply adjust the spring constant of a vibration isolating mount, comprised by embedding a spring constant adjusting member into the inside of an elastic body. SOLUTION: An outer peripheral surface of a center pipe 11 arranged on an inner side in a radius direction, and the inner peripheral surface of a collar 12 arranged on an outer side in the radius direction, are connected by an elastic body 13, and also a pair of spring constant adjusting members 14 composed of a curved plate body are embedded into the inside of the elastic body 13, to constitute a vibration isolating mount M. Increasing the total area of plural through holes 141 , formed on the adjusting members 14, reduces a spring constant in a Y-Y direction, and conversely, reducing the total area of the through holes 14 increases the spring constant in a Y-Y direction. When plural kinds of the vibration isolating mounts M, different in the total area of the through holes 141 , are manufactured, since the dimension or shape of the adjusting members 14 themselves are not changed, a die or jig, for manufacturing the mount M, is not needed to be modified, thereby contributing to cost down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration mount having a spring constant adjusting member embedded inside an elastic body connecting an inner cylinder member and an outer cylinder member.

[0002]

2. Description of the Related Art An elastic body for connecting an inner cylinder member and an outer cylinder member of an anti-vibration mount has a ring-shaped inter-ring embedded coaxially with the inner cylinder member and the outer cylinder member to adjust a spring constant. Is already known from JP-A-6-109075.

[0003]

By changing the size and shape of the spring constant adjusting member, it is possible to adjust the spring constant of the anti-vibration mount. However, the spring constant is set to a target value from the beginning. Since it is difficult to make them coincide, a large number of anti-vibration mounts in which a plurality of types of spring constant adjusting members having different dimensions and shapes are embedded are actually prototyped, and a mount having a target spring constant is selected from the mounts.

However, when burying a spring constant adjusting member having a different size or shape inside the elastic body, it is necessary to remodel a mold for molding the elastic body each time.
There was the problem of spending a lot of money and time.

The present invention has been made in view of the above circumstances, and has as its object to easily adjust the spring constant of an anti-vibration mount having a spring constant adjusting member embedded in an elastic body. .

[0006]

In order to achieve the above object, the invention described in claim 1 is directed to an outer cylindrical member disposed radially inward and an outer cylindrical member disposed radially outward. While connecting the inner peripheral surface with the elastic body, a plate-shaped spring constant adjusting member curved along the outer peripheral surface of the inner cylindrical member and the inner peripheral surface of the outer cylindrical member is embedded inside the elastic body. In the vibration isolating mount, a plurality of through holes for adjusting a spring constant are formed in the spring constant adjusting member.

According to the above configuration, the spring constant of the anti-vibration mount can be arbitrarily adjusted only by changing the total area of the spring constant adjusting through holes formed in the spring constant adjusting member. Moreover, since the size and shape of the spring constant adjusting member itself do not change, there is no need to change the mold or jig for embedding the spring constant adjusting member inside the elastic body.
The time and cost required for adjusting the spring constant can be reduced.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the spring constant is set within a projected area of the inner cylinder member viewed in a load input direction corresponding to a spring constant to be adjusted. A plurality of through holes of the adjustment member are located.

According to the above configuration, since the plurality of through-holes of the spring constant adjusting member are located within the projected area of the inner cylindrical member viewed in the load input direction, the elastic body filled inside the through-hole can be removed. It is possible to effectively elastically deform the inner cylinder member that is moved by the input of the load, thereby improving the effect of adjusting the spring constant.

According to a third aspect of the present invention, there is provided a method for adjusting the spring constant of an anti-vibration mount according to the first aspect, wherein the spring constant of a prototype anti-vibration mount is measured, and the measured value of the spring constant is measured. If is greater than the target value, a prototype anti-vibration mount having a spring constant adjusting member with an increased total area of the through-hole is measured and the spring constant is again measured, and the measured value of the spring constant falls below the target value. If this is the case, a prototype anti-vibration mount having a spring constant adjusting member with a reduced total area of the through-hole is measured and the spring constant is measured again, and this is repeated to match the spring constant of the anti-vibration mount to the target value. It is characterized by the following.

According to the above configuration, the spring constant of the prototype anti-vibration mount is actually measured, and the next trial production is performed based on the relationship between the total area of the through holes and the spring constant based on the deviation between the measured value and the target value. It is possible to predict the increase or decrease in the total area of the through-hole of the spring constant adjusting member of the anti-vibration mount, so that the spring constant of the anti-vibration mount can be matched to the target value with the minimum number of prototypes. Therefore, the time and cost required for repairing a mold and the like can be significantly reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 6 show an embodiment of the present invention. FIG. 1 is a perspective view of a front subframe of an automobile, FIG. 2 is a longitudinal sectional view of an anti-vibration mount, and FIG. 3 is a sectional view taken along line 3, FIG. 4 is a diagram illustrating a use state of the anti-vibration mount, FIG. 5 is a diagram illustrating a variation of the spring constant adjusting member, and FIG. 6 is a diagram illustrating a manufacturing process of the anti-vibration mount.

As shown in FIG. 1, a front subframe SF of an automobile includes a front beam 1 extending in the left-right direction of the vehicle body, a left side beam 2 _L and a right side beam 2 _R extending rearward from both left and right ends of the front beam 1. And a rear beam 3 that connects between the rear ends of the left and right side beams 2 _L and 2 _R , and is formed in a substantially frame shape, and an engine or suspension (not shown) is supported by the front sub-frame SF. The four corners of the front sub-frame SF are elastically supported through four anti-vibration mounts M on the lower surfaces of left and right side frames F, F (see FIG. 4) extending in the front-rear direction on both right and left sides of the vehicle body.

As shown in FIGS. 2 and 3, the anti-vibration mount M has a thick cylindrical center pipe 11 constituting the inner cylindrical member of the present invention, and an outer periphery of the center pipe 11 constituting the outer cylindrical member of the present invention. A thin cylindrical collar 12 fitted coaxially with the outer peripheral surface of the center pipe 11 and the collar 12
Elastic body 1 fixed by baking to the inner peripheral surface of
3, a pair of spring constant adjusting members 14, which are formed of a metal plate curved in an arc shape and are embedded in the elastic body 13,
14. The lower end of the collar 12 and the flange 12 ₁ is formed integrally, ₁ ... four projections 13 extending integrally from the resilient body 13 is protruded from the lower surface of the flange 12 _1. The spring constant adjusting members 14 and 14 are diametrically opposed on a circumference coaxial with the center pipe 11 and the collar 12, and upper and lower ends thereof are elastic members 13.
Slightly protrudes from the upper and lower surfaces. Spring constant adjusting member 14,
A plurality of through-holes 14 ₁ for adjusting a spring constant, which will be described later, are formed in the base 14.

As shown in FIG. 4, the anti-vibration mount M having the above structure is inserted from below into a substantially cup-shaped holder 21, and the upper end of the center pipe 11 is
Top with projecting from the opening 21 ₁ above, its projections 13 ₁ ... elastic body 13 protrudes downward from the flange 21 ₂ of the lower end of the holder 21. The front sub-frame SF is composed of an upper member 22 and a lower member 23, and an opening 22 formed coaxially with both members 22, 23.
₁ and 23 ₁ , the upper surface of the holder 21 is fitted to the opening 2
Together brought into contact with the lower surface of 2 ₁ peripheral flange 21 ₂ of the upper surface of the holder 21 is brought into contact with the lower surface of the opening 23 ₁ periphery of the lower member 23.

A bolt 25 passing through the washer 24 and the center pipe 11 of the anti-vibration mount M is screwed into a nut member 26 welded to the inside of the side frame F from below, so that the upper surface of the washer 24 and the lower surface of the side frame F The center pipe 11 is sandwiched and fixed therebetween. At this time, an anti-vibration mount M is provided between the upper surface of the washer 24 and the lower surface of the lower member 23 of the front subframe SF.
With projections 13 ₁ of the elastic body 13 is compressed, the rubber sealing ring between the lower surface of the upper surface and the side frame F of the upper member 22 of the front subframe SF 27
Is pinched. Thus, the front subframe SF is 4
It is elastically supported on the lower surfaces of the left and right side frames F, F via the individual vibration isolation mounts M.

FIG. 5 shows the elastic body 13 of the anti-vibration mount M installed.
This shows a mold for injection vulcanization molding.
And inside the cavity 33 formed between the upper mold 32
Center pipe 11, collar 12, and spring constant adjustment unit
Preheat the rubber after kneading with the materials 14 and 14 set
Into the cavity 33 through the gate and the injection gate
inject. At that time, the rubber self-heats and the viscosity decreases,
The cavity 33 is filled in a short time. Injected go
The through-hole 14 of the spring constant adjusting members 14 ₁Of the ...
The elastic body 13 and the spring constant adjusting section
The bonding strength with the members 14 increases.

The anti-vibration mount M is mounted so that the XX direction in FIG. 3 coincides with the vehicle longitudinal direction, and the YY direction coincides with the vehicle lateral direction. Spring constant adjustment member 1
When the elastic members 13 are buried at both ends of the elastic body 13 in the YY direction, the deformation of the elastic body 13 is caused by the spring constant adjusting members 14 and 1.
4, the spring constant in the Y-Y direction increases. On the other hand, since the deformation of the elastic body 13 in the XX direction is hardly restricted by the spring constant adjusting members 14, the spring constant in the XX direction does not change much.

For example, it is assumed that the spring constant of the anti-vibration mount M in the vehicle body left-right direction (Y-Y direction) is set to be approximately twice the spring constant in the vehicle body front-rear direction (XX direction). At this time, when employing a spring constant adjusting member 14, 14 with ₁ ... the two through holes 14 (see FIG. 6 (A)), Y- Y direction of the spring constant by the spring constant adjusting member 14 and 14 This is approximately three times the spring constant in the XX direction. Therefore, if the spring constant in the YY direction is made smaller than the current value, the spring constant in the YY direction can be set to approximately twice the spring constant in the XX direction.

[0021] Adjustment of the Y-Y direction of the spring constant is possible by changing the total area through holes 14 ₁ ... of which is formed on a spring constant adjusting members 14, 14. That is, the through hole 14
_When the total area is increased by changing the size or number of ₁ ..., The elastic body 13 is easily deformed in the YY direction,
The spring constant in the direction decreases. Meanwhile, since the X-X direction of the spring constant is less affected by the original spring constant adjusting members 14, 14, also by changing the through-hole 14 ₁ ... total area of the spring constant adjusting members 14 X-X The spring constant in the direction hardly changes. Therefore, FIG. 6 (A) → (B) →
(C) → When gradually increasing the through-hole 14 ₁ ... total area of the spring constant adjusting member 14, 14 as shown in (D), Y
Decreased -Y direction of the spring constant is gradually can eventually Y-Y direction of the spring constant reaches the through hole 14 ₁ ... the total area of which becomes almost twice the X-X direction of the spring constant.

In order to set the spring constant of the anti-vibration mount M in the YY direction to a desired value, for example, the anti-vibration mount M in which the spring constant adjusting members 14 and 14 of FIG.
Actually measuring the spring constant and prototype, if actually measured spring constant is larger than the target value, the through-hole 14 ₁ ... spring constant adjusting member 14, 14 with increased total area (Fig. 6 (C) and 6 (D), the anti-vibration mount M having the desired spring constant can be obtained by sequentially producing the anti-vibration mount M embedded therein and measuring the spring constant. Conversely, if the spring constant of the first prototype vibration damping mount M is less than the target value, the through-hole 14 ₁ ... spring constant adjusting member 14, 14 with reduced total area of the (see FIG. 6 (A)) By experimentally producing the embedded anti-vibration mount M and actually measuring the spring constant, the anti-vibration mount M having a desired spring constant can be obtained.

According to the present embodiment as described above, only varying the through-hole 14 ₁ ... total area of the spring constant adjusting members 14, changing the spring constant adjusting members 14, 14 themselves sizes and shapes The spring constant of the anti-vibration mount M can be adjusted without performing. Therefore, it is possible to manufacture a plurality of types of anti-vibration mounts M having different spring constants without modifying or changing the mold shown in FIG. 5, which can contribute to a reduction in time and cost. In addition, when adjusting the spring constant of the anti-vibration mount M, the spring constant of the prototype anti-vibration mount M is actually measured, and the through-holes of the spring constant adjusting members 14 are determined based on the deviation between the measured value and the target value. Since the increase or decrease of the total area of 14 ₁ ... is predicted and the next anti-vibration mount M is prototyped based on the prediction, the spring constant can be matched with the target value with the minimum number of prototypes. Therefore, the time and cost required for developing the anti-vibration mount M can be significantly reduced.

By the way, the through-holes 14 ₁ of the spring constant adjusting members 14, 14 embedded in the elastic body 13 of the anti-vibration mount M.
Are arranged within the projected area of the center pipe 11 as viewed in the load input direction (YY direction in FIG. 3). This is because the elastic body 13 has the center pipe 11 and the collar 1
The center pipe 1
This is because, if the through holes 14 ₁ are arranged within the projection area of 1, the rubber filled in the through holes 14 ₁ can be effectively elastically deformed to promote a reduction in the spring constant.

Although the embodiments of the present invention have been described in detail above, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, the spring constant adjusting members 14, 14 divided into two are embedded in the elastic body 13, but one spring constant adjusting member formed in an annular shape, or three or more spring constant adjusting members are formed. It is also possible to embed the split spring constant adjusting member inside the elastic body 13. Further, the anti-vibration mount M of the present invention can be applied to uses other than the support of the subframe SF of an automobile.

[0027]

As described above, according to the first aspect of the present invention, the spring constant of the anti-vibration mount can be changed only by changing the total area of the spring constant adjusting through holes formed in the spring constant adjusting member. Can be adjusted arbitrarily. Moreover, since the size and shape of the spring constant adjusting member itself do not change, there is no need to change a mold or a jig for embedding the spring constant adjusting member inside the elastic body, and the time and cost required for adjusting the spring constant are eliminated. Can be reduced.

According to the invention described in claim 2,
Since the plurality of through-holes of the spring constant adjusting member are located within the projected area of the inner cylindrical member viewed in the load input direction, the inner cylindrical member that moves the elastic body filled in the through-hole by inputting the load. , And the effect of adjusting the spring constant can be enhanced.

According to the third aspect of the present invention,
The spring constant of the prototype anti-vibration mount was actually measured, and based on the deviation between the measured value and the target value, the spring constant adjustment member of the next anti-vibration mount was prototyped based on the relationship between the total area of the through holes and the spring constant. Since the increase or decrease in the total area of the through holes can be predicted, it is possible to match the spring constant of the anti-vibration mount to the target value with a minimum number of prototypes, which is necessary for repair of molds and the like. Time and cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a front subframe of an automobile.

FIG. 2 is a longitudinal sectional view of an anti-vibration mount.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a diagram showing a use state of an anti-vibration mount.

FIG. 5 is a diagram showing a manufacturing process of a vibration-proof mount.

FIG. 6 is a view showing a variation of a spring constant adjusting member.

[Explanation of symbols]

11 Center Pipe (Inner Tube Member) 12 Collar (Outer Tube Member) 13 Elastic Body 14 Spring Constant Adjusting Member 14 ₁ Through Hole M Anti-Vibration Mount

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Eihachi Morimoto 1239 Kamekubo, Oimachi, Iruma-gun, Saitama Prefecture Yamashita Rubber Co., Ltd.

Claims (3)

[Claims] An inner cylindrical member (1) disposed radially inward.
An outer cylindrical member (1) disposed radially outward from the outer peripheral surface of (1).
While connecting the inner peripheral surface of 2) with the elastic body (13),
A plate-shaped spring constant adjusting member (14) curved along the outer peripheral surface of the inner cylindrical member (11) and the inner peripheral surface of the outer cylindrical member (12) is embedded in the elastic body (13). a vibration damping mount comprising, said spring constant adjusting member (14) to the elastic mount is characterized in that forming a plurality of through holes for adjusting the spring constant (14 _1). 2. A plurality of through-holes (14 ₁ ) of said spring constant adjusting member (14) are provided within a projected area of said inner cylindrical member (11) viewed in a load input direction corresponding to a spring constant to be adjusted. The anti-vibration mount according to claim 1, wherein the mount is located. 3. The method for adjusting the spring constant of an anti-vibration mount (M) according to claim 1, wherein the spring constant of the prototype anti-vibration mount (M) is measured, and the measured value of the spring constant is a target value. Is greater than the spring constant adjusting member (1) having the total area of the through holes (14 ₁ ) increased.
4) The anti-vibration mount (M) having the sample was manufactured and the spring constant was measured again. If the measured value of the spring constant was lower than the target value, the total area of the through hole (14 ₁ ) was reduced. A vibration isolator mount (M) having a spring constant adjusting member (14) is prototyped, the spring constant is measured again, and this is repeated to match the spring constant of the vibration isolator mount (M) to a target value. How to adjust the spring constant of the anti-vibration mount.