JP2001187935A - Liquid-sealed vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the performance of sealing an orifice passage in a partition member made of a plurality of members. SOLUTION: A first mounting member 1 and a second mounting member 2 are connected by an elastic body part 3, and an internally delimited liquid chamber is divided by a partition member 15 into a main liquid chamber 17 and a subsidiary liquid chamber 18 that are connected by an idle orifice passage 20 and damping orifice passages 21. The partition member 15 is assembled when an intermediate member 41 of an elastic material such as rubber is placed between an upper member 40 and a lower member 42 having relatively higher rigidity. The partition member 15 defines the idle orifice passage 20 and the two-stage or upper and lower damping orifice passages 21 along the mating faces of the constituent members, and has a peripheral portion fixed to the second mounting member 2. That boundary between the idle orifice passage 20 and the upper damping orifice passage 21 which is inside of the fixed portion is sealed in taper-matching construction where taper portions 41a and 49 are placed in sliding contact in upper-lower relation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-sealing vibration isolator suitable for use in an engine mount for an automobile or the like.

[0002]

2. Description of the Related Art A first attachment member attached to a vibration source, a second attachment member attached to a vehicle body, and a substantially cone-shaped elastic body provided between the first and second attachment members are provided. A liquid chamber having a main body as a part of a wall is formed, the liquid chamber is divided into a main chamber and a sub chamber by a substantially circular partition member, and an orifice passage communicating the main chamber and the sub chamber is formed as a partition member. The formed liquid-vibration isolator is known. Further, the partition member is divided into a rigid division portion and an elastic division portion, and the orifice passage is formed by a mating surface of both division portions, and the rigid division portion has higher rigidity than the elastic division portion, and the elastic division portion has It is also known to make it easier to deform elastically than the rigid divisions, and to integrate these rigid divisions by overlapping the elastic divisions with each other by sandwiching and fixing each outer peripheral portion (for example, Japanese Patent No. 27799953).

[0003]

In the case where the partition member is divided as described above, it is necessary to ensure the sealing performance at the joint between the two divided portions forming the orifice passage. The elastic split part exerts sealing properties at the joint with the rigid split part, but since these split parts are integrated by clamping and fixing their outer peripheral parts, they are closer to the inner peripheral side than the orifice passage. The degree of adhesion of the formed seal portion is reduced, and the sealability tends to decrease. Then, this invention aims at improving the sealing property of such a part.

[0004]

In order to solve the above-mentioned problems, a liquid seal vibration isolator according to the present invention comprises a first mounting member mounted on a vibration source side and a second mounting member mounted on a vehicle body side. And a substantially conical elastic body portion provided therebetween, forming a liquid chamber having the elastic body portion as a part of a wall, and forming the liquid chamber into a main chamber and a sub chamber by a substantially circular partition member. In the liquid seal vibration isolator in which the orifice passage communicating the main chamber and the sub-chamber is formed in the partition member, the partition member is divided into a rigid division portion and an elastic division portion. The orifice passage is formed at the mating surface, and the rigid division is higher in rigidity than the elastic division, and the elastic division easily elastically deforms to the extent that the joint with the rigid division exerts a sealing property, Overlap these rigid and elastic divisions The outer peripheral portions are integrated by being clamped and fixed, and the inner circumferential side of the seal portion formed by joining the rigid split portion and the elastic split portion formed with the orifice passage therebetween is formed by the rigid split portion and the elastic split portion. It is characterized in that it has a taper mating structure to be joined in a taper shape.

[0005]

The seal portion formed by joining the rigid division portion and the elastic division portion sandwiching the orifice passage has a tapered mating structure in which the rigid division portion and the elastic division portion are joined in a tapered shape on the inner peripheral side. As a result, the elastic split part at the joint part is elastically deformed to the rigid split part side while being in close contact with the rigid split part, thereby exerting a sealing property, and by clamping and fixing the outer peripheral part, the adhesive force at the inner peripheral side seal part is reduced. Even if it is lower than the outer peripheral portion side, this portion forms a taper mating structure, so that the degree of adhesion of the joint portion can be increased and sufficient sealing performance can be maintained. As a result, the orifice passage can be reliably sealed, and the vibration-proof effect due to the liquid column resonance can be sufficiently exhibited.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an engine mount for an automobile according to an embodiment of the present invention; 1 to 5 relate to an embodiment, FIG. 1 is an overall longitudinal sectional view (corresponding to line 1-1 in FIG. 2), FIG. 2 is an overall plan view, and FIG. 3 is an enlarged sectional view of a main part of a partition member. FIG. 4 is a diagram showing a planar shape of a partition member, and FIG. 5 is an enlarged sectional view of a main part showing a seal structure.

First, in FIGS. 1 to 4, an engine mount as a liquid seal vibration isolator has a first mounting member 1, a second mounting member 2 and an elastic main body 3, and the first mounting member 1 Is attached to the engine side (not shown) with a screw 4, and the second
The mounting member 2 is similarly mounted on a vehicle body (not shown) by a flange 5.

The elastic main body 3 is a substantially conical member made of a suitable elastic material such as a known rubber or the like, and the first mounting member 1 penetrates the top thereof and is integrated therewith. The periphery of the skirt of the elastic body 3 forms a flange 6 and is integrated with a flange metal fitting 7 which forms a part of the second mounting member 2.
The lower part of the elastic main body 3 forms a lining portion 8 which extends further downward from the flange 6 into a substantially cylindrical shape, and has a substantially cylindrical side wall portion 9.
It is integrated into the inner surface of.

The side wall portion 9 forms a part of the second mounting member 2 and is a member on the outside of which the flange fitting 7 is integrated by welding. Around the circumference, round holes 10 are formed at intervals of 180 ° in the circumferential direction. Only in the round hole 10, the lining portion 8 is not supported by the side wall portion 9, and forms a horizontal movable film 11 which is allowed to freely elastically deform. A circular groove 12 is formed at a position inside the round hole 10 around the lateral movable film 11,
The deformation of the movable lateral movable film 11 is facilitated. The lower part of the side wall part 9 is integrated by caulking with the flange 14 of the cylindrical base part 13 of the second mounting member 2, and the partition member 15 and the diaphragm 16 are connected to the connection part of the side wall part 9 and the cylindrical base part 13. Each perimeter is fixed.

[0010] The partition member 15 is provided together with the elastic body 3.
A main liquid chamber 17 is defined, and a sub liquid chamber 18 is defined between the main liquid chamber 17 and the diaphragm 16. The main liquid chamber 17 and the sub liquid chamber 18 are provided with an idle orifice passage 20 formed in the partition member 15 for absorbing idle vibration and an upper and lower two for absorbing low frequency vibration.
It communicates with a damping orifice passage 21 formed in a stage. However, the idle orifice passage 20 is an opening / closing type that opens only when idling, and the damping orifice passage 21 is always open.

As apparent from FIGS. 3 and 4, the outlet 22 of the idle orifice passage 20 is connected to the diaphragm 16.
Is closed by pressing the central portion 23 of the hollow valve 24 at the top thereof, and the inside of the valve 24 is made negative by a negative pressure source (not shown) from the communication passage 26, so that a return spring provided inside the valve 24 is provided. When the valve 24 is lowered against the outlet 25, the outlet 22 is opened and the main liquid chamber 1 is opened.
7 and the auxiliary liquid chamber 18 communicate with each other.

The valve 24 is formed by covering the surface of a cup-shaped core member 27 with an elastic body 28, and a lower part of the elastic body 28 is covered with a lid-like member 29 fitted to the bottom of the first mounting member 1. Close to the airtight inside. In addition, the supporting tubular metal fitting 30 is fitted inside the cylindrical base 13, the upper end thereof forms an inner flange 31, the periphery of the diaphragm 16 is sandwiched between the diaphragm 16 and the partition member 15, and the middle portion is An inwardly protruding step portion 32 is formed, and a lower end portion is bent inward to form a caulking portion 33 overlapping the periphery of the lid-like member 29, so that the elastic body 2 is provided between the step portion 32 and the caulking portion 33.
The terminal section 34 is closely attached to the lid-like member 29 by sandwiching the enlarged terminal section 34 around the periphery 8 and fixed.

Reference numeral 35 in FIG. 1 denotes a medium-high frequency device, which has a substantially cup shape opened downward and
7, fixed to the lower end of the first mounting member 1 protruding into
By moving up and down together with the first mounting member 1, a liquid column resonance in a middle and high frequency range is generated within a clearance formed between the middle and high frequency device 35 and the elastic main body 3.

Reference numeral 36 denotes a stopper, which is formed at the tip of a stopper arm 37 that extends integrally from the first mounting member 1 in the radial direction, and is formed in an arch shape upward from the flange fitting 7. It enters the stopper bracket 38 and comes into contact with the flange 6 side at the time of large vibration to restrict deformation of a certain degree or more.

Next, the structure of the partition member 15 will be described in detail.
As shown in FIG. 3 and FIG.
0, the intermediate member 41, and the lower member 42
Are arranged one above the other so that they are in the middle.
Among these constituent members of the partition member, the upper member 40 and the lower member 42 correspond to a rigid dividing portion in the present invention, and the intermediate member 41 corresponds to an elastic dividing portion.

The upper member 40 is made of a resin material which is relatively rigid with respect to the intermediate member 41. The upper member 40 has a flange 43 around which an annular wall 44 projecting upward is integrally formed. The annular wall 44 faces the side wall 9 with a predetermined clearance therebetween, and a part of the annular wall 44 faces the lateral movable film 1.
The portion facing 1 particularly forms the control film 44a.

The inside of the annular wall 44 forms a concave portion 45, and the lower surface side thereof has a substantially spiral idle orifice groove 46.
Are formed. The idle orifice groove 46 forms an entrance 47 which is open at one end to the concave portion 45, and the other end goes around in the center direction and communicates with the outlet 22 formed substantially in the center of the lower member 42 so as to be entirely formed. It is open downward. The idle orifice groove 46 is provided for the lower intermediate member 4.
1 and the opening is closed to form an idle orifice passage 20.

The intermediate member 41 is made of a relatively flexible elastic member such as rubber, and has a groove 50 which is opened upward at a position outside the idle orifice passage 20, and the opening is closed by a flange 43. To form a part of the damping orifice passage 21. The groove 50 is formed in the flange 43
Of the lower member 42 communicates with the damping orifice passage 21 on the lower member 42 side at a communication port 52 formed at the other end.

As is apparent from FIG. 5, the outer peripheral side of the inner peripheral portion 48 forming the idle orifice passage 20 and the groove 50 are formed.
Forms a tapered portion 49, and correspondingly comes into sliding contact with the tapered portion 41a of the intermediate member 41 formed at the boundary between the idle orifice groove 46 and the flange 43. A tapered portion 41b is also formed on the lower surface side of the intermediate member 41 at the boundary between the inner peripheral portion 48 and the groove 50, and correspondingly, a tapered portion is formed on the inner peripheral side from the groove 53 of the lower member 42. The intermediate member 41 and the lower member 42 are also in sliding contact with each other in a tapered manner.

Referring again to FIGS. 3 and 4, the lower member 42 is made of a relatively rigid resin or the like, like the upper member 40, and a groove 53 which is open upward is formed in the outer peripheral portion thereof. Low frequency orifice passage 21 closed at bottom
Is formed. The positions of the groove 53 and the groove 50 partially overlap in the vertical direction. One end 54 of the groove 53 communicates with the communication port 52, and the other end is an outlet 55 that opens into the sub liquid chamber 18.

Next, the operation of the present embodiment will be described. To assemble the partition member 15, the upper member 40 and the lower member 42 are vertically overlapped with the intermediate member 41 as the center, and the three members are closely contacted in the vertical direction. As a result, of the upper surface of the intermediate member 41, the inner peripheral portion 48 side portion closes the open portion of the idle orifice groove 46 that is opened downward, so that the space portion becomes the idle orifice passage 20 and the outer peripheral portion side. The groove 5 is closely contacted with the flange 43 of the upper member 20 and the opening of the groove 50 opened upward is covered with the flange 43 so that the groove 5
The space inside 0 is the upper side of the damping orifice passage 21.

The lower surface of the intermediate member 41 is
Covers the open portion of the groove 53 which is opened upward to the outer peripheral portion of
The space in the groove 53 is a lower portion of the damping orifice passage 21. When the outer peripheral portion of the partition member 15 assembled in this manner is sandwiched between the lower end portion of the side wall portion 9 and the inner flange 31 of the supporting tubular metal fitting 30 and fixed by caulking, the three members constituting the partition member 15 become The upper member 40 is in close contact with the upper and lower members, and the member 42 presses the intermediate member 41 from above or below.

Thus, each of the orifice passages 20, 21
The opening can be reliably sealed by using the intermediate member 41, which is an elastic member that is relatively soft and easily elastically deformed. In addition, at the boundary between the idle orifice passage 20 and the upper damping orifice passage 20, the tapered portion 49 of the upper member 40 and the tapered portion 41a of the intermediate member 41 are brought into sliding contact with each other in a tapered manner and are in close contact with each other.

In particular, since the outer peripheral portion of the partition member 15 is fixed, the adhesive force at the joint tends to be weaker toward the inner peripheral side. The degree can be maintained at a predetermined level. Therefore, this tapered alignment structure enables a reliable and strong seal, and ensures separation of the orifice passages 20, 21. In addition, the sealing structure for the inner peripheral side of the lower damping orifice passage 21 also has a sufficient sealing property at the inner peripheral side by the sliding contact between the tapered portion 41b and the tapered portion 42a. The vibration-proof effect of the idle orifice passage 20 due to resonance can be sufficiently exhibited.

In addition, since the idle orifice passage 20 and the upper damping orifice passage 21 are arranged so as to be vertically displaced from each other, this arrangement is advantageous in that the boundary is formed in a tapered shape. In addition, the orifice passages 20, 21 can be secured even though the seal surface can be secured with a sufficient size by adopting the seal taper matching structure.
Can be closely arranged without much separation in the radial direction, so that the entire apparatus can be made more compact.

The present invention is not limited to the above embodiments, but can be variously modified and applied. For example, the number of orifice passages may be any number as long as the number is plural, and the type thereof is not limited. Further, the position where the tapered seal portion is provided may be any position as long as it is away from the fixed portion. Further, the arrangement of the orifice passages is not limited to the form in which the height is shifted in the vertical direction as in the embodiment, but may be the form in which they are arranged on the same plane.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of an engine mount according to an embodiment.

FIG. 2 is an external plan view thereof.

FIG. 3 is an enlarged sectional view of a main part around the partition member.

FIG. 4 is a plan view of the partition member.

FIG. 5 is an enlarged sectional view of a main part showing the seal structure further enlarged.

[Explanation of symbols]

A first attachment member 1, a second attachment member 2, an elastic body 3,
Side wall part 9, round hole 10, partition member 15, diaphragm 1
6, main liquid chamber 17, sub liquid chamber 18, idle orifice passage 20, damping orifice passage 21, upper member 40, intermediate member 41, taper portion 41a, taper portion 41b, lower member 42, taper portion 42a, annular wall 44, Tapered part 49

Claims (1)

[Claims] A first attachment member attached to the vibration source side, a second attachment member attached to the vehicle body side, and a substantially conical elastic main body provided between these members; A liquid chamber having a main body as a part of a wall is formed, the liquid chamber is divided into a main chamber and a sub chamber by a substantially circular partition member, and an orifice passage communicating the main chamber and the sub chamber is formed as a partition member. In the formed liquid seal vibration isolator, the partition member is divided into a rigid division portion and an elastic division portion, and the orifice passage is formed at a mating surface of the two division portions, and the rigid division portion is larger than the elastic division portion. Rigidity is high, and the elastic split part is easily elastically deformed to the extent that it exhibits a sealing property at the joint with the rigid split part, and these rigid split parts and elastic split parts are overlapped and each outer peripheral part is clamped and fixed. Integrated with orifice passage A liquid characterized by having a tapered mating structure in which the rigid division part and the elastic division part are joined in a tapered shape on the inner peripheral side of the seal part formed by joining the rigid division part and the elastic division part formed with the liquid crystal interposed therebetween. Sealed vibration isolator.