JP2009144844A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components, by reducing restrictions on shape design of an inner cylinder and an elastic body. <P>SOLUTION: This vibration control device 11 is formed by interposing the elastic body 16 between the inner cylinder 12 and an outer cylinder 13. In the vibration control device, the outer cylinder 13 is extended in the axial C direction, and at least a part of the extension part is extended inside in the radial direction, and a stopper wall part 21 is formed for regulating displacement in both directions in the axial direction of the inner cylinder 12 relative to the outer cylinder 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration isolator formed by inserting an elastic body between an inner cylinder and an outer cylinder.

  In the conventional vibration isolator as described above, for example, when an engine or the like is supported via a bracket, the bracket is formed in a long cylindrical shape, and an outer cylinder is press-fitted into one end of the bracket. A stopper wall portion extending inward in the radial direction is provided at the other end portion, and a contact portion provided in the inner cylinder is brought into contact with the stopper wall portion to restrict axial movement of the inner cylinder. Damage to the elastic body due to excessive axial movement of the inner cylinder is prevented.

However, in the above configuration, a long cylindrical bracket is required, so that there is a problem that the bracket becomes large. As an anti-vibration device that solves this problem, for example, one disclosed in Patent Document 1 is known. As shown in FIG. 2, the vibration isolator includes an inner cylinder 1 and an outer cylinder 2, and an elastic body 3 is interposed between the inner cylinder 1 and the outer cylinder 2. Further, here, the sleeve 4 is fixed inside the outer cylinder 2, and one end portion of the outer cylinder 2 is extended inward in the radial direction by a curling process to form a stopper wall portion 5, and the inner cylinder 1 A disc-shaped contact member 6 is fixed to the elastic member 3, which is positioned between the stopper wall 5 and the sleeve 4, and the elastic body 3 is caused by excessive axial movement of the inner cylinder 1 relative to the outer cylinder 2. To prevent damage.
Japanese Utility Model Publication No. 5-67839

  However, in the latter vibration isolator, the stopper wall 5 abuts against the abutting member 6 to restrict the movement of the inner cylinder 1 in one direction with respect to the axial movement of the inner cylinder 1 with respect to the outer cylinder 2. However, since the movement of the inner cylinder 1 in the other direction is restricted by the sleeve 4 coming into contact with the contact member 6, it is indispensable to provide the sleeve 4 in the outer cylinder 2. There has been a problem that the shape design of the cylinder 1 and the elastic body 3 becomes a great restriction and the number of parts increases.

  An object of the present invention is to advantageously solve the above problems, and the vibration isolator of the present invention is a vibration isolator formed by interposing an elastic body between an inner cylinder and an outer cylinder. The outer cylinder is extended in the axial direction, and at least a part of the extended portion is extended inward in the radial direction, so that the axial displacement of the inner cylinder relative to the outer cylinder is reduced in both directions. The stopper wall part to regulate is formed.

  In such a vibration isolator, the outer cylinder is extended in the axial direction, and a stopper wall portion formed by extending at least a part of the extended portion inward in the radial direction is provided on the inner cylinder with respect to the outer cylinder. Regulates axial displacement in both directions. Therefore, according to the vibration damping device of the present invention, it is not necessary to separately provide a member for restricting the displacement of the inner cylinder in the outer cylinder, so that restrictions on the shape design of the inner cylinder and the elastic body can be reduced and the number of parts can be reduced. Can also be reduced.

  In the vibration isolator of the present invention, it is preferable that the stopper wall portion is formed by curling. If curling is used, the stopper wall can be formed after the inner cylinder is incorporated into the outer cylinder and the elastic body is vulcanized and bonded, so the stopper wall extending in the radial direction can be easily integrated with the outer cylinder. Thus, the manufacturing cost can be reduced.

  In the vibration isolator of the present invention, the outer abutting portion located outside the stopper wall portion and abutting against the stopper wall portion, and the stopper wall portion located inside the stopper wall portion are abutted against the stopper wall portion. Preferably, the outer abutting portion is formed separately from the inner cylinder, and the inner abutting portion is formed integrally with the inner cylinder. In this way, after the inner cylinder is assembled in the outer cylinder and the elastic body is vulcanized and bonded, the outer abutting portion formed separately from the inner cylinder can be assembled to the inner cylinder. Can be simplified.

  Furthermore, in the vibration isolator of the present invention, it is preferable that a bracket for mounting on the outer cylinder is provided and a positioning portion for positioning the outer cylinder is formed on the bracket. If it does in this way, it can prevent that the vibration isolator comes out of a bracket by the positioning part.

  Furthermore, in the vibration isolator of the present invention, the vibration isolator is of a liquid-filled type, and the outer cylinder has a large diameter portion that accommodates a main rubber made of the elastic body, and a smaller diameter than the large diameter portion. And a small-diameter portion that accommodates a liquid chamber that encloses the liquid. In this way, by adopting a liquid enclosure type in which the movement of the enclosed liquid is restricted by an orifice, the tuning range for each required characteristic can be widened, and the portion of the outer cylinder that accommodates the liquid chamber can be expanded. Since the smaller diameter portion is smaller than the portion accommodating the main rubber, the outer cylinder can be easily assembled by press-fitting the bracket into the cylindrical portion.

  Furthermore, in the vibration isolator of the present invention, the positioning portion of the bracket has a through hole, the small diameter portion has a smaller diameter than the through hole, and the large diameter portion has a larger diameter than the through hole. And preferred. In this way, the small diameter portion is passed through the through hole of the positioning portion of the bracket, the large diameter portion is abutted against the peripheral portion of the through hole, and the outer cylinder is placed on the cylindrical portion having the through hole. Thus, the outer cylinder can be easily positioned and assembled by press-fitting the bracket into the cylindrical portion.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a longitudinal section of one embodiment of the vibration isolator of the present invention. In the figure, reference numeral 11 denotes a vibration isolator of this embodiment, 12 denotes an inner cylinder, and 13 denotes an outer cylinder. , 14 is a large diameter portion of the outer cylinder 13, 15 is a small diameter portion of the outer cylinder 13, and 16 is a main rubber.

  That is, the vibration isolator 11 of this embodiment is interposed, for example, between an engine (not shown), which is a vibration generating part of an automobile, and a vehicle body (not shown) of the automobile. This prevents vibration transmission, and includes an inner cylinder 12 and an outer cylinder 13, and a main rubber 16 made of a rubber-like elastic body interposed between the inner cylinder 12 and the outer cylinder 13, and the engine. The engine side bracket 17 made of cast aluminum, for example, and the car body side bracket 18 made of steel plate, for example, are attached to the vehicle body.

  Here, the inner cylinder 12 is formed separately from the vehicle body side bracket 18, and one end portion (lower end portion in the figure) is fastened and fixed to the vehicle body side bracket 18 with a bolt 19. An annular flange 20 projecting in the radial direction is formed integrally with the inner cylinder 12 (on the upper end in the figure). As will be described later, the annular flange 20 functions as an inner contact portion, and the engine side bracket 17 functions as an outer contact portion.

  The large-diameter portion 14 and the small-diameter portion 15 constituting the outer cylinder 13 each have a substantially cylindrical shape, and are arranged so as to share the central axis C with the inner cylinder 12. The diameter portion 14 is extended in one direction (downward in the drawing) in the direction of the axis C, and at least a part of the extension portion is extended inward in the radial direction by curling, so that the large diameter portion 14 of the outer cylinder 13 is obtained. A stopper wall portion 21 that restricts displacement of the inner cylinder 12 in both directions along the axis C (vertical direction in the figure) is formed.

  The main body rubber 16 has a generally inverted truncated conical shape and is mainly accommodated in the large diameter portion 14 of the outer cylinder 13. A base side extension 22 extends upward in the figure from the large diameter base portion of the main body rubber 16. The base-side extension 22 extends into the small-diameter portion 15 of the outer cylinder 13, and is divided into a partition portion 25 composed of two discs 23, 24, a rubber film body 26, and an outer peripheral portion thereof. A diaphragm 28 composed of a ring metal fitting 27 embedded in is fixed in a liquid-tight manner. The main rubber 16 is vulcanized and bonded to the inner peripheral surface of the large-diameter portion 14, and the base-side extension portion 22 is vulcanized and bonded to the inner peripheral surface of the small-diameter portion 15.

  On the other hand, the end portion of the inner cylinder 12 where the annular flange 20 is provided is embedded in a small-diameter distal end portion (lower end portion in the figure) of the main rubber 16, and from the small-diameter distal end portion of the main rubber 16. A distal end side extension 29 extends downward in a cylindrical shape in the drawing, and the distal end side extension 29 covers the inner cylinder 12 tightly and is radially divided at the distal end by a cut in the axial direction. Is partially covered. The front end portion of the main rubber 16 and the front end side extension portion 29 are vulcanized and bonded to the outer peripheral surface of the inner cylinder 12, and the radial portion of the front end portion side extension portion 29 is bonded to the vehicle body side bracket 18 with an adhesive, for example. Has been.

  The main rubber 16 and the diaphragm 28 form a liquid chamber 30 therein, and a liquid such as water, silicon oil or ethylene glycol is sealed in the liquid chamber 30. The partition portion 25 divides the liquid chamber 30 into a main liquid chamber 31 on the main rubber 16 side and a sub liquid chamber 32 on the diaphragm 28 side, and extends in the circumferential direction around the inner portion of the partition portion 25. The main liquid chamber 31 and the sub-liquid chamber 32 are communicated with each other through the formed orifice 33, so that the liquid in the liquid chamber 30 passes through the orifice 33 through the orifice 33 as the main rubber 16 receives a load. Since it moves between the liquid chamber 31 and the sub liquid chamber 32, the vibration isolator 11 functions as a liquid-filled vibration isolator.

  Further, the partition portion 25 has a storage chamber 34 communicating with the main liquid chamber 31 and the sub liquid chamber 32 through an opening at the center of the partition portion 25, and is stored in the liquid chamber 30 in the storage chamber 34. A disc-shaped membrane 35 made of a material having a specific gravity slightly larger than that of the liquid is accommodated with a slight gap from the discs 23 and 24. The membrane 35 has a main rubber 16 having a high frequency and a small amplitude. Even when the orifice 33 is clogged due to a load, it vibrates in the storage chamber 34 to allow the liquid to move between the main liquid chamber 31 and the sub liquid chamber 32, and the main rubber 16 has a low frequency. When a load having a large amplitude is received, the opening to the main liquid chamber 31 or the sub liquid chamber 32 is closed close to the disk 23 or the disk 24, and the liquid is passed through the orifice 33 so that the orifice 33 functions effectively.

  Further, here, the outer cylinder 13 is divided into a large-diameter portion 14 and a small-diameter portion 15, and the large-diameter portion 14 and the small-diameter portion 15 are elastically connected via the main body rubber 16 and the base-side extension portion 22. The small-diameter portion 14 includes a base-side extension portion 22, a partition portion 25 and a diaphragm 28, and a liquid chamber 30 containing a liquid. Inverted dynamic damper is formed with a mass that oscillates.

  The engine-side bracket 17 has a cylindrical support portion 36 into which the large-diameter portion 14 of the outer cylinder 13 is press-fitted, and an end portion in the axis C direction of the support portion 36 (inner circumference formed at the upper end portion in the figure). The positioning portion 37 has a flange-shaped positioning portion 37 and a through hole 38 inside the positioning portion 37. The positioning portion 37 abuts on the large diameter portion 14 press-fitted into the support portion 36, and the large diameter portion. 14 is positioned at a predetermined position with respect to the engine-side bracket 17 to prevent the large-diameter portion 14 from slipping out of the support portion 36 against the load due to the weight of the engine, and the outer diameter of the large-diameter portion 14 of the outer cylinder 13. Is larger than the inner diameter of the through-hole 38, and the outer diameter of the small-diameter portion 15 of the outer cylinder 13 is more than the inner diameter of the through-hole 38 to allow the above-described oscillation of the small-diameter portion 15 and the inside thereof. It is set to a small diameter.

  When the vibration isolator 11 of this embodiment is manufactured, for example, the main rubber 16 is vulcanized and bonded to the inner peripheral surface of the large diameter portion 14 and the outer end surface of the small diameter portion 15 and the base side extension portion 22 is bonded. Is then vulcanized and bonded to the inner peripheral surface of the small-diameter portion 15, and the body rubber 16 and the distal end side extension portion 29 are vulcanized and bonded to the outer peripheral surface including the annular flange 20 of the inner cylinder 12, and then the stopper wall The curling process for forming the portion 21 is performed, and then the partition portion 25 and the diaphragm 28 are assembled in the base side extension portion 22 and the liquid chamber 30 is filled with the liquid, and then the small diameter portion 15 and the large diameter portion 14 are filled. The opposite end (upper end in the figure) is drawn and the partition portion 25 and the diaphragm 28 are sealed in a liquid-tight manner, and then the large-diameter portion 14 is press-fitted into the support portion 36 of the engine-side bracket 17. Fixed and next After assembling the vehicle body side bracket 18 to the inner cylinder 12, to adhere to the vehicle body side bracket 18 to extend the distal end of the distal end-side extension part 29 radially.

  In the vibration isolator 11 of this embodiment, for example, when vibration is applied from the engine to the large-diameter portion 14 of the outer cylinder 13 via the engine side bracket 17, the main rubber is basically applied by the vibration load. 16 is elastically deformed and absorbs vibration energy inside the rubber to prevent the vibration from being transmitted to the vehicle body side bracket 18. Further, when the inner cylinder 12 is displaced in both directions along the axis C relative to the large-diameter portion 14 by the applied vibration, the large-diameter portion 14 of the outer cylinder 13 is extended in the axis C direction, and the extension portion The stopper wall portion 21 formed by extending at least a part inward in the radial direction is a tip portion with respect to the displacement of the inner cylinder 12 toward the bounce side (upward in the drawing) where the main rubber 16 is compressed. The inner cylinder 12 is displaced toward the rebound side (downward in the drawing) where the main rubber 16 is extended by contacting the vehicle body side bracket 18 through the radial tip of the side extension 29 to restrict further displacement. On the other hand, the further displacement is restricted by contacting the annular flange 20 of the inner cylinder 12 through the small diameter tip of the main rubber 16.

  Therefore, according to the vibration isolator 11 of this embodiment, vibration applied from the engine via the engine side bracket 17 can be prevented from being transmitted to the vehicle body side bracket 18, and the displacement of the inner cylinder 12 can be prevented. Since the displacement in both directions can be restricted without separately providing a member for restricting the inner cylinder 13 in the outer cylinder 13, it is possible to reduce restrictions on the shape design of the inner cylinder 12 and the main body rubber 16 and to reduce the number of parts. .

  Furthermore, according to the vibration isolator 11 of this embodiment, since the stopper wall 21 is formed by curling, after the inner cylinder 12 is assembled in the outer cylinder 13 and the main rubber 16 is vulcanized and bonded thereto, Since the stopper wall portion 21 can be formed, the stopper wall portion 21 extending in the radial direction can be easily integrated with the outer cylinder 13 and the manufacturing cost can be reduced.

  Further, according to the vibration isolator 11 of this embodiment, the vehicle body side bracket 18 as the outer contact portion that is located outside the stopper wall portion 21 and contacts the stopper wall portion 21, and the stopper wall portion 21 on the inner side. And an annular flange 20 as an inner abutting portion that is positioned and abutted against the stopper wall portion 21, the vehicle body side bracket 18 is formed separately from the inner cylinder 12, and the annular flange 20 is formed integrally with the inner cylinder 12. Therefore, the body cylinder bracket 18 formed separately from the inner cylinder 12 can be assembled to the inner cylinder 12 after the inner cylinder 12 is assembled in the outer cylinder 13 and the main rubber 16 is vulcanized and bonded thereto. The configuration of the vibration isolator 11 can be simplified.

  Further, according to the vibration isolator 11 of this embodiment, the engine side bracket 17 is provided to the large diameter portion 14 of the outer cylinder 13, and the cylindrical support portion 36 of the engine side bracket 17 is attached to the outer cylinder 13. Since the positioning portion 37 for positioning the large diameter portion 14 is formed, the positioning portion 37 can prevent the vibration isolator 11 from coming out of the engine side bracket 17 due to the vibration on the bounce side.

  Further, according to the vibration isolator 11 of this embodiment, the vibration isolator 11 is of a liquid-filled type, and the outer cylinder 13 has a large diameter portion 14 that accommodates the main rubber 16 and a smaller diameter than the large diameter portion 14. And the small-diameter portion 15 that accommodates the liquid chamber 30 that encloses the liquid. Therefore, by adopting a liquid enclosure type that restricts the movement of the enclosed liquid by the orifice 33, a tuning range for each required characteristic can be obtained. Further, the portion of the outer cylinder 13 that accommodates the liquid chamber 30 is the smaller diameter portion 15 that is smaller in diameter than the portion that accommodates the main rubber 16, so that the engine-side bracket 17 is connected to the cylindrical support portion 36. The outer cylinder 13 can be easily assembled to the engine side bracket 17 by press-fitting the large diameter portion 14.

  Furthermore, according to the vibration isolator 11 of this embodiment, the positioning portion 37 of the engine side bracket 17 has the through hole 38, the small diameter portion 15 has a smaller diameter than the through hole 38, and the large diameter portion 14 has the through hole. Since the diameter is larger than 38, the small diameter portion 15 is passed through the through hole 38 of the positioning portion 37 of the engine side bracket 17, and the large diameter portion 15 is abutted against the positioning portion 37 around the through hole 38. The large-diameter portion 14 of the outer cylinder 13 can be press-fitted into the cylindrical support portion 36 having the through-hole 38. Therefore, the positioning and combination of the outer cylinder 13 by press-fitting the engine-side bracket 17 into the support portion 36 is possible. Can be easily attached. And since the small diameter part 15 and the thing of the inside become the mass which rock | fluctuates by making a lower part into a fulcrum, an inverted type dynamic damper is comprised, Therefore The breadth of tuning for every characteristic calculated | required can be further expanded.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims. For example, the large-diameter portion 14 of the outer cylinder 13 And the small-diameter portion 15 may be integrated so as not to be separated as in the above-described embodiment, and the dynamic damper effect may not be obtained. In this case, the small-diameter portion 15 side is press-fitted and fixed to the engine-side bracket 17. You may do it.

  Thus, according to the vibration damping device of the present invention, there is no need to separately provide a member for regulating the displacement of the inner cylinder in the outer cylinder, so that restrictions on the shape design of the inner cylinder and the elastic body can be reduced and the number of parts can be reduced. Can also be reduced.

It is sectional drawing which shows the longitudinal cross-section of one Example of the vibration isolator of this invention. It is sectional drawing which shows the longitudinal cross-section of an example of the conventional vibration isolator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Elastic body 4 Sleeve 5 Stopper wall part 6 Contact member 11 Vibration isolator 12 Inner cylinder 13 Outer cylinder 14 Large diameter part 15 Small diameter part 16 Main body rubber 17 Engine side bracket 18 Car body side bracket 19 Bolt 20 Annular flange 21 Stopper wall portion 22 Base side extension portion 23 Disc 24 Disc 25 Partition portion 26 Rubber film body 27 Ring fitting 28 Diaphragm 29 Tip side extension portion 30 Liquid chamber 31 Main liquid chamber 32 Sub liquid chamber 33 Orifice 34 Accommodating Chamber 35 Membrane 36 Support part 37 Positioning part 38 Through hole

Claims (6)

An anti-vibration device formed by inserting an elastic body between the inner cylinder and the outer cylinder,
The outer cylinder is extended in the axial direction, and at least a part of the extended portion is extended radially inward to restrict the displacement of the inner cylinder in both axial directions with respect to the outer cylinder. An anti-vibration device in which a wall is formed.   The vibration isolator according to claim 1, wherein the stopper wall portion is formed by curling. An outer contact portion that is located outside the stopper wall portion and contacts the stopper wall portion; and an inner contact portion that is positioned inside the stopper wall portion and contacts the stopper wall portion;
The vibration isolator according to claim 1 or 2, wherein the outer abutting portion is formed separately from the inner cylinder, and the inner abutting portion is formed integrally with the inner cylinder. Comprising a bracket attached to the outer cylinder,
The vibration isolator according to any one of claims 1 to 3, wherein a positioning portion for positioning the outer cylinder is formed on the bracket. The vibration isolator is a liquid-filled type,
The anti-vibration system according to claim 4, wherein the outer cylinder has a large-diameter portion that accommodates the main rubber made of the elastic body, and a small-diameter portion that is smaller in diameter than the large-diameter portion and accommodates a liquid chamber that encloses liquid. apparatus. The positioning portion of the bracket has a through hole,
The vibration isolator according to claim 5, wherein the small diameter portion has a smaller diameter than the through hole, and the large diameter portion has a larger diameter than the through hole.

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