JP2001099221A - Stopper in cylindrical vibration damping device of liquid sealing type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stopper capable of being positioned with respect to an inner cylinder 1, easy to produce, lightweight, inexpensive and reliable. SOLUTION: A body rubber member 3 is arranged between an inner cylinder 1 and an outer cylinder 2. A variable capacity type main liquid chamber 4 and an auxiliary chamber 6 are provided to hold the inner cylinder 1 therebetween. Both the chambers are communicated with each other by an orifice passage 7. A stopper is provided to project to the inside of the chamber 4 from the cylinder 1. The stopper 20 is formed out of a ring-like stopper member 21 long in one direction made of a pressed steel plate or the like, which is fitted to the cylinder 1 at its specified outer circumferential position, then caulked by a caulking means, and embedded in a part 31 of the member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical liquid-filled type vibration damping device mainly used for vibration-damping a power unit such as an engine of an automobile.

[0002]

2. Description of the Related Art Heretofore, as one type of mount for supporting a vibrating body such as an automobile engine so as not to transmit vibration to a vehicle body, a mount is provided on one of a vibration generating source side and a supporting side. Between the connected inner cylinder and the outer cylinder connected to the other, while arranging the main body rubber as a vibration isolating base, the volume of the liquid chamber is variable vertically relative to the inner cylinder, for example, 2. Description of the Related Art There is known a cylindrical liquid-filled type vibration damping device in which a main liquid chamber and a sub liquid chamber are provided, and these two liquid chambers are communicated with each other through an orifice passage.

In this vibration isolator, the volume of the main and sub liquid chambers changes as the rubber of the main body elastically deforms and the inner cylinder and the outer cylinder are relatively displaced by vibration input from an engine or the like.
As a result of the liquid flowing through the orifice passage, an excellent vibration damping effect can be obtained by a liquid flowing effect such as a resonance effect.

[0004] In the above-mentioned vibration damping device, usually, a stopper protruding from the inner cylinder toward at least one of the liquid chambers is provided in order to restrict and reinforce excessive displacement due to elastic deformation of the main body rubber, At the time of large displacement, it comes into contact with the inner surface of the liquid chamber.

[0005] By the way, a stopper in this type of conventional vibration damping device is formed by pressing or welding a solid stopper member formed into a predetermined shape by forging into an inner cylinder, or by molding a pressed steel plate. Generally, a ring-shaped metal fitting having a substantially elliptical cross section is attached to the inner cylinder and fixed by welding and the like (for example, Japanese Patent Application Laid-Open No. H10-4).
7419, JP-A-1-126451).

However, the above-mentioned solid type stopper is heavy in the stopper itself, which increases the weight of the vibration isolator and is expensive. In addition, the welding type stopper is difficult to position at the time of welding, and the welding location is limited. Also, it is difficult to position by press fitting, and the press fitting operation is not so easy.

The present invention has been made in view of the above, and as a stopper structure in a cylindrical liquid filled type vibration damping device, positioning with respect to an inner cylinder is easy, it is easy to make, it can be manufactured at a low weight and at a low cost. This provides a highly reliable stopper.

[0008]

According to the present invention, a main body rubber is provided between an inner cylinder and an outer cylinder, and a liquid chamber having a variable volume is provided opposite the inner cylinder. A cylindrical liquid-filled type vibration damping device having a liquid chamber communicated with an orifice passage and having a stopper projecting from the inner cylinder into the liquid chamber, wherein the stopper is a ring-shaped stopper made of a metal plate A member is inserted into a predetermined position on the outer periphery of the inner cylinder and fixed by caulking means.

According to the structure of the stopper, the stopper member can be easily positioned with respect to the inner cylinder, and can be easily and reliably fixed at a predetermined position without requiring welding.
In addition, the stopper member is light in the shape of a ring made of a metal plate, and does not affect the anti-vibration function.

In the above-mentioned stopper, it is particularly preferable that the stopper member is formed in a ring shape long in one direction from a pressed steel plate, is caulked and fixed to an inner cylinder, and is embedded in a part of a main body rubber. Yes, this makes it easier to make, cheaper and lighter.

The stopper member is fitted and inserted such that one end in the longitudinal direction is along the outer periphery of the inner cylinder, and is caulked and fixed so that the intermediate portion is constricted along the curvature of the inner cylinder. The state in which the cylinder is held can be provided, thereby improving the reliability of the stopper.

The stopper member is fitted and inserted so that an intermediate portion in the longitudinal direction extends along the outer periphery of the inner cylinder, and is caulked and fixed so that both end portions are respectively constricted along the curvature of the inner cylinder. Both ends in the longitudinal direction may be made to protrude from the inner cylinder on opposite sides. As a result, a stopper function can be performed for a large displacement in both directions.

In the above stopper, it is preferable that a recess is formed on the outer periphery of the inner cylinder at a position where the stopper member is fixed, and the stopper member is recessed along the recess, whereby the caulked and fixed stopper is provided. The member can be prevented from being displaced in the axial direction with respect to the inner cylinder or rotationally displaced in the circumferential direction, a stable stopper can be formed even without welding, and its reliability can be improved.

[0014]

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 cross-sectional view schematically showing an example of a cylindrical liquid-filled type vibration damping device having a stopper according to the present invention, FIG. 2 is a longitudinal sectional view of the same, and FIG. FIG. 4 is a sectional view and a side view of the fixed state, and FIG. 4 is a perspective view showing a process of fixing the stopper member to the inner cylinder.

In FIGS. 1 and 2, (1) is an inner cylinder having a relatively large thickness and a small diameter attached to one of a vibration source such as an engine of an automobile and a supporting side of a vehicle body, and (2) is the other. The inner cylinder (1) and the outer cylinder (2) are arranged inside and outside at predetermined intervals and slightly eccentric with their axes parallel to each other. ing. (3)
Is a main body rubber as a vibration isolating base provided between the inner cylinder (1) and the outer cylinder (2), and the inner cylinder (1) is sandwiched inside the main rubber (3). A liquid chamber in which a liquid is sealed up and down is provided, for example, a main liquid chamber (4) on the lower side, and a sub liquid chamber (6) in which a part of the chamber wall is formed by a diaphragm (5) made of a rubber film on the upper side. Have been. These main liquid chambers (4)
The sub-liquid chamber (6) is communicated with the sub-liquid chamber (6) by an orifice passage (7).

In the illustrated embodiment, an intermediate cylinder (8) fixed inside the outer cylinder (2) by press-fitting means or end caulking means, and an intermediate cylinder outside the intermediate cylinder (8). An orifice fitting (9) formed by being divided into two so as to be wrapped from both sides, and the intermediate cylinder (8)
The portion corresponding to the main liquid chamber (4) and the sub liquid chamber (6) is opened like a window. The main rubber (3) is vulcanized and bonded on the inner peripheral side to the outer circumference of the inner cylinder (1), and the outer peripheral side is vulcanized and bonded on the intermediate cylinder (8).
It is arranged between the inner cylinder (1) and the outer cylinder (2).
(10) is a space in contact with the diaphragm (5) of the sub liquid chamber (6), and communicates with the outside.

As a result, the main rubber chamber (3) is elastically deformed by the vibration input, and the inner cylinder (1) and the outer cylinder (2) are relatively displaced. When the volume of 6) changes and the liquid flows through the orifice passage (7), a vibration damping effect can be exerted by a liquid flowing effect such as a resonance effect.

Reference numeral (20) denotes a stopper for restricting excessive displacement due to elastic deformation of the main rubber (3). It is configured to protrude into the liquid chamber (4) and abut against the opposing liquid chamber surface during large displacement.

In the case of the present invention, the stopper (20) is formed by inserting a ring-shaped stopper member (21) made of a metal plate into a predetermined position on the outer periphery of the inner cylinder (1), and fixed by caulking means. I have.

Usually, the stopper member (21) is formed from a pressed steel plate into a ring shape longer than the outer diameter of the inner cylinder (1) in one direction such as a substantially elliptical cross section or a substantially elliptical cross section. The member (21) is inserted into a required position of the inner cylinder (1), caulked and fixed, and buried in a part (31) of the main rubber (3).

As a specific method and form for caulking and fixing the stopper member (21), for example, as shown in FIGS. 4 (A) and 4 (B), at least one end in the longitudinal direction is an inner cylinder (1). Using a stopper member (21) formed in a ring shape having a substantially elliptical cross section having an arc substantially corresponding to the outer periphery, one end (21a) of the stopper member (21) in the longitudinal direction is
While being inserted into a predetermined position along the outer periphery of the inner cylinder (1) [FIG. 4 (A)], while confirming the position, the middle part in the longitudinal direction is parallel to the axial direction of the inner cylinder (1). And crimped so as to be constricted along the curvature of the inner cylinder (1) (FIG. 4B). As a result, as shown in FIG. 3, the one end (21a) of the stopper member (21) holds the inner cylinder (1) and the other end protrudes in one direction from the inner cylinder (1). , Can be securely and easily fixed at a predetermined position. In particular, positioning can be easily performed. (22) shows a constricted portion by the caulking fixation.

Further, as shown in FIG. 5, a stopper member (21) formed in a ring shape having a substantially elliptical cross section is used, and a middle portion in the longitudinal direction is along the outer periphery of the inner cylinder (1). So that both end portions are crimped so as to be constricted along the curvature of the inner cylinder, and both ends (21a) and (21b) in the longitudinal direction are opposite to each other from the inner cylinder (1). It can be made to protrude. Thus, for example, a stopper function can be performed for a large displacement in both the up and down directions.

Further, in the stopper (20), as shown in FIG. 6 or 5, the outer periphery of the fixed position of the stopper member (21) in the inner cylinder (1), in particular, the part where the stopper member (21) contacts. One or a plurality of recesses (13) are formed in the stopper member, and the stopper member (21) is recessed at a location corresponding to the recess (13) along the recess (13), so that the stopper member (21) is formed in the axial direction and the circumferential direction. It is preferable to keep them engaged. (2
3) shows the recessed part. The shape and arrangement of the concave portion (13) can be set as appropriate.

Accordingly, even when an oblique force acts on the stopper member (21) fixed by caulking, the engagement between the concave portion (13) of the inner cylinder (1) and the concave portion (23) is achieved. ,
The displacement in the axial direction and the rotational displacement in the circumferential direction are prevented, so that a more stable stopper (20) can be formed without welding.

In addition to the above, the surface of the portion of the inner cylinder (1) where the stopper member (21) is fixed is subjected to knurling of fine irregularities for non-slip, or adhesive means for temporary fixing until fixing by caulking. Can also be used.

The shape of the projecting portion of the stopper member (21) is, as shown in FIG. 1 to FIG. 3, FIG. 5, or FIG. The shape of the liquid chamber and the shape of the stopper are not limited to the shape shown in FIGS. 7 (A) and 7 (B), but may be tapered toward the protruding end, or may be an inverted tapered shape. Accordingly, implementation in various forms is possible, and the protrusion dimension and axial dimension can be set arbitrarily.

In any case, in the state where the stopper member (21) is fixed to the inner cylinder (1) as described above, the vulcanization molding of the main rubber (3) is performed simultaneously with the main rubber (3). A part (31) is covered and buried as shown in FIG. 1 to form a stopper (20) having a predetermined shape.

Further, the main rubber (3) is vulcanized and molded in this way, and the inner cylinder (1) and the intermediate cylinder (8) are connected to each other. 5)
Insert the pre-compression plate (40) into the space (10) of the
The orifice fitting (8), which is divided into two, is inserted into the outer peripheral side of the intermediate cylinder (8), and the outer cylinder (2) is press-fitted to the outer periphery of the intermediate cylinder (8) and the orifice fitting (9) to assemble the main body. By filling the liquid into the liquid chamber (4) and the sub liquid chamber (6), a cylindrical liquid-filled vibration isolator as shown in FIG. 1 can be obtained.

The stopper (20) in the cylindrical liquid-filled type vibration damping device is provided by fixing an annular metal stopper member (21) formed of a pressed steel plate or the like to the inner cylinder (1) by caulking means. As a result, the stopper structure can be easily manufactured at low cost without welding, and is lightweight and does not affect the vibration isolating function.

The structure of the cylindrical liquid-filled type vibration damping device is not limited to the embodiment shown in FIGS. 1 and 2. For example, a sub-liquid chamber opposed to the main liquid chamber is formed in two chambers. The main body rubber is disposed between the inner cylinder and the outer cylinder, and a liquid chamber having a variable volume is provided relative to the inner cylinder, and these liquid chambers are communicated by an orifice passage. The present invention can be implemented in a cylindrical liquid-filled type vibration damping device having various structures having a stopper protruding into the liquid chamber from the inner cylinder.

[0032]

As described above, according to the structure of the stopper in the cylindrical liquid filled type vibration damping device of the present invention, since the stopper member is fixed to the inner cylinder by the caulking means, the stopper member is welded. In contrast, the stopper member is easy to position with respect to the inner cylinder, easy to manufacture, and uses a member formed in a ring shape with a pressed steel plate etc., so it is lightweight, can be manufactured at low cost, and provides a highly reliable stopper. You can do it.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing an example of a cylindrical liquid-filled type vibration damping device including a stopper according to the present invention.

FIG. 2 is a longitudinal sectional view of the cylindrical liquid-filled type vibration damping device according to the first embodiment.

3A and 3B are a cross-sectional view and a side view, respectively, showing a state in which a stopper member is fixed to an inner cylinder.

FIGS. 4A and 4B are perspective views showing a process of fixing a stopper member to an inner cylinder, respectively.

FIG. 5 is a cross-sectional view (A) and a side view (B) of a state where a stopper member of another embodiment is fixed to an inner cylinder.

FIG. 6 is a cross-sectional view (A) and a side view (B) of a state in which a stopper member of still another embodiment is fixed to an inner cylinder.

FIGS. 7A and 7B are cross-sectional views showing other examples of the form of the protrusion of the stopper member in FIGS.

[Explanation of symbols]

 (1) Inner cylinder (2) Outer cylinder (3) Body rubber (4) Main liquid chamber (5) Diaphragm (6) Sub liquid chamber (7) Orifice passage (8) Intermediate cylinder (9) Orifice fitting (13) Recess (20) Stopper (21) Stopper member (21a) One end (22) Neck (23) Recess

Claims (5)

[Claims] A main body rubber is disposed between an inner cylinder and an outer cylinder, and a liquid chamber having a variable volume is provided opposite to the inner cylinder, and these liquid chambers communicate with each other through an orifice passage. A cylindrical liquid-filled type vibration damping device having a stopper protruding into the liquid chamber from the inner cylinder, wherein the stopper has a ring-shaped stopper member made of a metal plate on a predetermined portion of the outer periphery of the inner cylinder. The stopper in the cylindrical liquid filled type vibration damping device which is inserted at the position of and fixed by the caulking means. 2. The cylindrical mold according to claim 1, wherein said stopper member is formed in a ring shape elongated in one direction from a pressed steel plate, caulked and fixed to an inner cylinder, and embedded in a part of a main body rubber. Stopper in liquid filled type vibration damping device. 3. The stopper member is fitted and inserted at one end in the longitudinal direction along the outer circumference of the inner cylinder, and is caulked and fixed so that the intermediate portion is constricted along the curvature of the inner cylinder. The stopper in the cylindrical liquid filled type vibration damping device according to claim 2, wherein the inner cylinder is held. 4. The stopper member is fitted and inserted so that an intermediate portion in the longitudinal direction is along the outer periphery of the inner cylinder, and is caulked and fixed so that both end portions are respectively constricted along the curvature of the inner cylinder. 3. The stopper in the cylindrical liquid-filled type vibration damping device according to claim 2, wherein both ends in the direction protrude from the inner cylinder toward opposite sides. 5. The cylinder according to claim 1, wherein a concave portion is formed on an outer periphery of the inner cylinder at a position where the stopper member is fixed, and the stopper member is concavely provided along the concave portion. Stopper in liquid-filled vibration isolator.