JP5457261B2 - Liquid filled vibration isolator - Google Patents

Description

  The present invention relates to a so-called differential liquid-filled vibration isolator that is suitable for use in a cabin mount or the like and has a large vibration damping performance. In particular, the components are connected to each other sufficiently firmly. The present invention proposes a technique for improving the sealing performance of the liquid sealed in the inside of the apparatus under a simple structure so that the apparatus can stably exhibit the vibration damping performance as expected.

  As this type of liquid-filled vibration isolator, there is one described in Patent Document 1. In Patent Document 1, when assembling each component of the vibration isolator, from one end side of the inner cylinder made of a rigid material, one or more members are fitted together, and at a predetermined position on the outer peripheral surface of the inner cylinder, The member is fixed by frictional engagement. In this case, in order to prevent leakage of the liquid sealed inside, particularly between the fitting members, a thin film is formed between the fitting members. Rubber is interposed.

  For example, in the vibration isolator described in Patent Document 2, as shown in FIG. 8 of the accompanying drawings, “inner peripheral edge portion of inner ring 40 of“ second integral vulcanization molded product 42 ” The seal rubber layer 44 is disposed. When the apparatus is manufactured, “the first integral vulcanized molded product 26 is press-fitted into the inner ring 40 of the second integral vulcanized molded product 42 and the second integral vulcanized molded product 42 is pressed. By fixing the vulcanized molded product 42 to the inner cylinder fitting 12 of the first integral vulcanized molded product 26, the "first integral vulcanized molded product 26" and the "second integral vulcanized molded product" are obtained. 42 ”.

International Publication No. 2009/100205 Pamphlet JP 2004-340377 A

  However, in the vibration isolator described in Patent Document 2, the “second integral vulcanized molded product 42” and the like are frictionally engaged with the outer peripheral surface of the “inner cylinder fitting 12” via the “seal rubber layer 44”. Therefore, when the “inner ring 40” of the “second integral vulcanized molded product 42” is press-fitted into the outer peripheral surface of the “inner cylindrical fitting 12”, depending on the dimensional accuracy of each member, The “seal rubber layer 44” on the inner peripheral side of the “inner ring 40” is rubbed on the outer peripheral surface of the “inner cylindrical fitting 12”, the “seal rubber layer 44” is peeled off, the rubber burrs are generated on the “seal rubber layer 44”, etc. May be triggered.

  According to these, not only the sealing performance of the internal sealed liquid by the “seal rubber layer 44” is deteriorated, but also the “inner ring 40” and the “inner cylinder fitting 12”, and thus “the first integral vulcanization”. It is impossible to realize the strong assembly between the “molded product 26” and the “second integral vulcanized molded product 42”, and as a result, the manufactured apparatus exhibits stable vibration damping performance. There was a problem that I could not.

  An object of the present invention is to solve such problems of the prior art, and the object of the present invention is to connect the inner cylinder and a member to be frictionally engaged with the outer peripheral surface thereof. In addition to being sufficiently strong, it is possible to reliably prevent leakage of the enclosed liquid from between the frictionally engaged members, and to stably exhibit the vibration damping performance as expected. The object is to provide a liquid-filled vibration isolator.

The liquid-filled vibration isolator according to the present invention includes an inner cylinder made of a rigid material, an outer cylinder disposed on the outer peripheral side of the inner cylinder, and the inner cylinder and the outer cylinder separated from each other in two axial directions. A pair of body rubbers connected to each other, a partition wall that bisects the space between the inner cylinder and the outer cylinder in the axial direction between both body rubbers, and an incompressible space in each space separating the partition walls Each liquid chamber enclosing a liquid, and a restriction passage provided on the partition wall to provide communication between the two liquid chambers, and at least one main body rubber is connected to the inner cylinder via a rigid fitting cylinder member. It is connected to the outer peripheral surface,
The end portion of the rigid fitting cylindrical member on the partition wall side is expanded in diameter compared to other portions, and there is a protruding portion to the partition wall side between the expanded diameter portion and the inner cylinder. An annular elastic member integrated with one main body rubber is provided,
The rigid fitting cylindrical member is frictionally engaged with the outer peripheral surface of the inner cylinder, and at least one of the step provided on the outer peripheral surface of the inner cylinder and the portion made of the rigid material of the partition wall with the protruding portion of the annular elastic member. It is made by crushing.

  Here, “rigidity” of “inner cylinder made of rigid material”, “rigid fitting tube member” and “part made of rigid material” means that these members are made of metal materials such as iron, steel, and aluminum, or non- It means that it consists of a plastic or other rigid material which is a metal material.

  Here, preferably, the annular elastic member is provided with a recess extending over the entire circumference on the outer peripheral side or the inner peripheral side of the protruding portion.

Preferably, a plurality of notch portions are provided at the tip of the end portion of the rigid fitting cylindrical member whose diameter has been expanded, and one main body rubber and the annular elastic member are integrated with each other through the notch portion. Concatenated,
A portion other than the notch portion at the tip of the rigid fitting tube member is brought into contact with at least one of the step of the inner tube and the rigid portion of the partition wall.

According to the liquid-filled vibration isolator of the present invention, the annular elastic member is fixed to the rigid fitting cylinder in a state in which the protruding portion of the annular elastic member is crushed at least one of the step of the inner cylinder and the rigid portion of the partition wall. By disposing inside the enlarged diameter portion of the member, the annular elastic member under compression deformation can sufficiently close the gap between the inner cylinder and the rigid fitting cylindrical member, and the rigid fitting cylindrical member Since the annular elastic member does not rub against the outer peripheral surface of the inner cylinder at the time of press-fitting into the inner cylinder, there is no possibility of rubber burr generation on the annular elastic member, peeling of the annular elastic member, etc. When the apparatus is used, leakage of the enclosed liquid inside can be effectively prevented.
Further, since the rigid fitting cylindrical member can be frictionally engaged with the outer peripheral surface of the inner cylinder at the portion other than the enlarged diameter portion of the rigid fitting cylindrical member without the intervention of the elastic member. The cylindrical member can be connected to the inner cylinder sufficiently firmly.
As a result of these, the apparatus stably exhibits the vibration damping performance as expected.

  Furthermore, in this vibration isolator, the annular elastic member between the enlarged diameter portion of the rigid fitting cylinder member and the inner cylinder is formed integrally with the main body rubber disposed on the outer peripheral side of the rigid fitting cylinder member. Therefore, since it is not necessary to prepare an annular elastic member as a subsidiary material in advance, there is no possibility of increasing the manufacturing cost, directly, the number of members, the number of assembly steps, and the like.

  Here, when the annular elastic member is provided with a depression over the entire circumference on the outer peripheral side or the inner peripheral side of the protruding portion thereof, the protruding portion is pushed by at least one of the step of the inner cylinder and the rigid portion of the partition wall. When it is crushed, it escapes and deforms into a recess on the outer peripheral side or the inner peripheral side, so the filling rate of the annular elastic member between the inner cylinder and the enlarged diameter portion of the rigid fitting cylindrical member increases. The sealing property of the sealed liquid can be further improved.

  Here, the rigid fitting cylindrical member is not only an elastic member such as an annular elastic member or main rubber, but also the rigid portion other than the notch at the tip of the rigid fitting cylindrical member is a step of an inner cylinder made of a rigid material. When the rigid fitting cylindrical member is assembled, the positioning of the partition wall with respect to the rigid member, etc. can always be reliably performed when the rigid fitting cylindrical member is assembled. Since the displacement of the main body rubber attached to the joint cylinder member and by extension to the outer cylinder surface with respect to the inner cylinder is prevented, it is possible to cause the apparatus to stably exhibit the vibration damping performance as expected at all times. it can.

1 is a cross-sectional view including a central axis showing one embodiment of the present invention. It is a principal part expanded sectional view which shows the vibration isolator shown in FIG. 1 in the attitude | position before making a rigid fitting cylinder member frictionally engage with an inner cylinder completely. It is a perspective view which takes out only the rigid fitting cylinder member of the vibration isolator shown in FIG. FIG. 2 is an exploded cross-sectional view showing an assembly process of each member of the vibration isolator shown in FIG. 1. It is a cross-sectional perspective view which expands and shows a part of vibration isolator shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
A vibration isolator 1 shown in a longitudinal sectional view in FIG. 1 includes an inner cylinder 2, an outer cylinder 3 arranged on the outer peripheral side of the inner cylinder 2, and an inner cylinder 2 and an outer cylinder 3 separated from each other in the direction of the axis C. A pair of main body rubbers 4 and 5 that are liquid-tightly connected at locations, and a partition wall 6 that bisects the space between the inner cylinder 2 and the outer cylinder 3 in the direction of the axis C between the main body rubbers 4 and 5; Liquid chambers 7 and 8 each formed by sealing an incompressible liquid in each space separating the partition wall 6, and a restriction passage provided on the partition wall 6 to provide communication between the liquid chambers 7 and 8. 9 is provided.

  Here, in the figure, the lower body rubber 5 is, for example, vulcanized and bonded to each of the members between the outer tube 3 and the rigid fitting tube member 10 disposed on the inner peripheral side of the outer tube 3. The main body rubber 5 is connected to the inner cylinder 2 via the rigid fitting cylinder member 10 by frictionally engaging the rigid fitting cylinder member 10 with the outer peripheral surface of the inner cylinder 2. .

And here, the diameter of the end portion (upper end portion in the figure) of the rigid fitting cylindrical member 10 on the liquid chamber 8 side is increased as compared with other portions, and the enlarged diameter portion 10a having a trumpet shape in the figure is formed. An annular elastic member 11 formed integrally with the main body rubber 5 is provided between the enlarged diameter portion 10 a and the outer peripheral surface of the inner cylinder 2.
The annular elastic member 11 is shown in FIG. 2 in an enlarged cross-sectional view illustrating the posture before the rigid fitting tube member 10 is completely frictionally engaged with the outer peripheral surface of the inner tube 2. In this surface, a protruding portion 11a that is annularly protruded in the direction of the axis C is provided, and a recess 11b is formed over the entire circumference on the outer peripheral side of the protruding portion 11a.

When the rigid fitting cylindrical member 10 and the annular elastic member 11 having such a configuration are completely frictionally engaged with the inner cylinder 2 as shown in FIG. In addition, the step 2a provided on the outer peripheral surface of the inner cylinder 2 and the substantially cylindrical rigid member 12 forming the inner peripheral side portion of the partition wall 6 are crushed and deformed to escape into the recess 11b. 2, the filling rate of the annular elastic member 11 in the enlarged diameter portion 10 a is increased, so that the sealed liquid from between the rigid fitting cylindrical member 10 and the inner cylinder 2 is increased. Leakage can be reliably prevented.
Further, since the friction engagement of the rigid fitting cylinder member 10 to the outer peripheral surface of the inner cylinder 2 is performed by a rigid part other than the enlarged diameter part 10a, the rigid fitting cylinder member 10 is changed to the inner cylinder 2. It can be connected sufficiently firmly.

In this case, if the annular elastic member 11 has a protruding portion 11a that is crushed by the step 2a of the inner cylinder 2, the gap between the rigid fitting cylinder member 10 and the inner cylinder 2 is sufficiently sealed. Therefore, it is not an essential configuration of the present invention to provide the annular elastic member 11 with a recess 11b as a clearance for the protruding portion 11a as shown in FIG.
Here, as shown in the figure, when the projecting portion 11a of the annular elastic member 11 is crushed, the annular elastic member 11 is sufficiently brought into close contact with the outer peripheral surface of the inner cylinder 2 to improve the sealing performance. As for the protruding portion 11a, the inner peripheral side of the recess 11b is provided, but the inner and outer periphery forming positions of the protruding portion 11a and the recess 11b can be switched.

By the way, the annular elastic member 11 is formed integrally with the main body rubber 5 fixed to the outer peripheral surface of the rigid fitting cylindrical member 10, thereby advantageously suppressing an increase in manufacturing cost due to an increase in the number of members. Can do.
In order to form the annular elastic member 11 integrally with the main body rubber 5, for example, as illustrated in a perspective view in which only the rigid fitting cylindrical member 10 is taken out in FIG. In the drawing, a plurality of cutout portions 10c are provided at a predetermined interval in the circumferential direction at the tip of the end portion on the diameter portion 10a side, and the annular elastic member 11, the main rubber 5 and the like are provided via the cutout portions 10c. Connect each other.

  As described above, when the annular elastic member 11 is integrally formed with the main body rubber 5 through the notch portion 10c, the rigid fitting cylinder member 10 is engaged with the inner cylinder 2 as shown in FIG. Since the rigid portion 10d other than the notch portion 10c at the tip of the rigid fitting cylinder member 10 can be brought into contact with the rigid member 12 of the partition wall 6 in the drawing in the aligned posture, the rigid fitting cylinder member 10 The positioning of the rigid fitting cylinder member 10 with respect to the inner cylinder 2 during use of the apparatus 1 and the like is prevented under the rigid body contact. It will be.

Here, from the viewpoint of reducing the force required for press-fitting the rigid fitting cylindrical member 10 to the outer peripheral surface of the inner cylinder in the assembling step of each component of the device 1, the rigid fitting cylindrical member 10 As shown in FIGS. 1 and 2, it is preferable that the portion 10 b adjacent to the enlarged diameter portion 10 a has a tapered shape that increases in diameter toward the partition wall 6 side.
Even if the rigid fitting cylinder member 10 has such a tapered shape, in the vibration isolator of the present invention, the lower end region of the drawing of the rigid fitting cylinder member 10 is sufficient on the outer peripheral surface of the inner cylinder 2. As described above, in combination with the friction engagement with the inner cylinder outer peripheral surface by the annular elastic member 11 crushed in the protruding portion 11a, the rigid fitting cylinder member 10 and the inner cylinder 2 are fixed. It is possible to reliably prevent leakage of the encapsulated liquid from between.

Here, the inner diameter of the annular elastic member 11 is preferably somewhat larger than the outer diameter of the inner cylinder 2 in the posture before complete engagement with the inner cylinder 2 shown in FIG.
According to this, when the annular elastic member 11 and the rigid fitting cylindrical member 10 are fitted to the outer peripheral surface of the inner cylinder 2, the annular elastic member 11 is not rubbed by the outer peripheral surface of the inner cylinder 2. Generation of damage to the elastic member 11 can be effectively prevented.
Even in this case, when the protruding portion 11a of the annular elastic member 11 is crushed by the step 2a of the inner cylinder 2 or the like, as shown in FIG. Since the gap between the annular elastic member 11 and the inner cylinder 2 is surely filled, the sealing performance by the annular elastic member 11 is ensured.

  By the way, in assembling each member when manufacturing such a vibration isolator 1, first, as shown in an exploded sectional view in FIG. A cylindrical mounting bracket 13 that surrounds one end side is connected to the inner cylinder side member 20 formed by integrally connecting the disc 14 to the end portion on one end side of the inner cylinder 2 while being connected by the main body rubber 4. The rigid member 12 forming the inner peripheral side portion of the partition wall 6 is fitted from the other end side of the inner cylinder 2, and the rigid member 12 is frictionally engaged around the inner cylinder 2.

Next, as shown in FIG. 4B, the outer cylinder side member 30 formed by connecting the outer peripheral surface of the rigid fitting cylindrical member 10 and the inner peripheral surface of the outer cylinder 3 with the main body rubber 5 is rigidly fitted. The combined cylinder member 10 is fitted on the outer peripheral surface of the inner cylinder 2 and is frictionally engaged with the inner cylinder 2.
Finally, the diameter-expanded cylindrical portion 3a of the outer cylinder 3 is squeezed inward and deformed to reduce the diameter, and the inner cylindrical mounting bracket 13 and the like are firmly fixed under the plastic deformation of the diameter-expanded cylindrical portion 3a. To do.

  It should be noted that here, in order to narrow down the diameter-enlarged cylindrical portion 3a of the outer cylinder 3 in this way, as shown in FIGS. 1 and 5, the end of the outer cylinder 3 on the cylindrical mounting bracket 13 side ( A flange reinforcing portion 3b that covers the lower surface and the side surface of the flange 13a provided on the cylindrical mounting bracket 13 is formed in advance on the upper end portion in the drawing, and prior to narrowing the enlarged diameter cylindrical portion 3a, FIG. As shown in a cross-sectional perspective view in b), the upward protruding portion 3c provided on at least a part of the side wall of the flange reinforcing portion 3b is folded inward toward the flange 13a and plastically deformed, It is preferable that the flange 13a is sandwiched and fixed between the flange reinforcing portion 3b and the protruding portion 3c of the outer cylinder 3.

  According to this, since the fall of the flange reinforcing portion 3b to the lower side of the figure due to the narrowing of the enlarged diameter cylindrical portion 3a (indicated by a virtual arrow A in FIG. 5A) is suppressed, the outer cylinder 3 is The cylindrical mounting bracket 13 can be reliably assembled at the expected position, and as a result, the quality of the vibration isolator 1 can be improved.

DESCRIPTION OF SYMBOLS 1 Anti-vibration device 2 Inner cylinder 2a Level difference 3 Outer cylinder 3a Diameter expansion cylinder part 3b Flange reinforcement part 3c Projection part 4, 5 Main body rubber 6 Partition wall 7, 8 Liquid chamber 9 Restriction passage 10 Rigid fitting cylinder member 10a Diameter expansion Part 10b Part adjacent to the enlarged diameter part 10c Notch part 10d Tip part other than the notch part 11 Annular elastic member 11a Protruding part 11b Depression 12 Rigid member 13 Cylindrical mounting bracket 13a Flange 14 Disc 20 Inner cylinder side member 30 Outside Tube side member

Claims (3)

An inner cylinder made of a rigid material, an outer cylinder arranged on the outer peripheral side of the inner cylinder, a pair of main body rubbers that connect the inner cylinder and the outer cylinder in a liquid-tight manner at two locations separated in the axial direction, and both main bodies A partition wall that bisects the space between the inner cylinder and the outer cylinder in the axial direction between the rubber, and each liquid chamber formed by sealing an incompressible liquid in each space across the partition wall; A liquid-filled type protection provided with a restricting passage provided on the partition wall and providing communication between the two liquid chambers, wherein at least one main body rubber is connected to the outer peripheral surface of the inner cylinder via a rigid fitting cylinder member. A vibration device,
The end portion of the rigid fitting cylindrical member on the partition wall side is expanded in diameter compared to other portions, and there is a protruding portion to the partition wall side between the expanded diameter portion and the inner cylinder. An annular elastic member integrated with one main body rubber is provided,
The rigid fitting cylindrical member is frictionally engaged with the outer peripheral surface of the inner cylinder, and at least one of the step provided on the outer peripheral surface of the inner cylinder and the portion made of the rigid material of the partition wall with the protruding portion of the annular elastic member. A liquid-filled vibration isolator that is crushed with a.   The liquid-filled vibration isolator according to claim 1, wherein the annular elastic member is provided with a depression over the entire circumference on the outer peripheral side or the inner peripheral side of the protruding portion. A plurality of notch portions are provided at the end of the end portion of the rigid fitting cylindrical member whose diameter has been expanded, and one main body rubber and the annular elastic member are integrally connected through the notch portion. ,
3. The liquid sealing according to claim 1, wherein a portion other than the notch portion at the tip of the rigid fitting cylindrical member is brought into contact with at least one of the step of the inner cylinder and the rigid portion of the partition wall. Type vibration isolator.

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