JP2009085315A - Cylindrical type antivibration device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical type antivibration device capable of changing antivibration characteristics at assembling, and capable of easily carrying out the adjustment of the antivibration characteristics according to an operating status. <P>SOLUTION: In a differential mount 10A, an outer tube 12 fixed to a suspension member 30, and an inner tube 11 inserted in the outer tube 12 and fixed to a differential 20 are connected to each other via an elastic member 13 in a state of being separated from each other in a radial direction. An adjustment member 16 having a wedge shape in a cross section becoming gradually thicker toward one direction in the extending direction of a center axis L of the inner tube 11 and the outer tube 12, and adjusting an initial elastic force by moving in the extending direction of the center axis L and compressively deforming the elastic member 13 in the radial direction is interposed between the inner tube 11 and the outer tube 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  According to the present invention, of a pair of connected members, an outer cylinder fixed to one member and an inner cylinder inserted in the outer cylinder and fixed to the other member are connected by an elastic member. The present invention relates to a cylindrical vibration isolator that suppresses transmission of vibration between connecting members.

  As one type of vibration isolator, as described in Patent Document 1, an outer cylinder fixed to one member is inserted into an inner cylinder fixed to the other member, and the outer cylinder and the inner cylinder are inserted. 2. Description of the Related Art A cylindrical vibration isolator is known that is connected by an elastic member made of an elastic body such as rubber while being separated in the radial direction.

According to such a cylindrical vibration isolator, vibrations input to the outer cylinder and the inner cylinder are attenuated as the elastic member is deformed, and vibrations between the members fixed to the outer cylinder and the inner cylinder are reduced. Transmission can be suppressed. Such a cylindrical vibration-proof member is used in, for example, a so-called differential mount that supports a differential for transmitting a driving force of an internal combustion engine of an automobile to left and right wheels on a vehicle body. By using such a differential mount, it is possible to suppress vibration from the drive system and vibrations input from the left and right wheels from being transmitted to the vehicle body via the differential.
JP 2003-49900 A

  By the way, in the case of automobiles, the shape and rigidity of the vehicle body and body are different for each vehicle type. Therefore, the characteristics of the transmitted vibration, that is, the amplitude and frequency also vary depending on the vehicle type, for example, transmission between the differential and the vehicle body. The characteristics of the vibrations that are generated are also different. Therefore, in order to effectively suppress the transmission of vibration by deformation of the elastic member, the elastic constant of the elastic member is changed as appropriate, and the vibration isolation characteristics of the cylindrical vibration isolator are adjusted according to the vibration characteristics of each vehicle model It is desirable to do. It should be noted that the vibration characteristics may vary from vehicle to vehicle even for the same vehicle type due to component tolerances and the like, and it is desirable to perform such adjustment for each vehicle.

  Also, in a mount structure that supports a supported body by a plurality of cylindrical vibration isolator, it is input when the supported body is supported by a plurality of cylindrical vibration isolator having the same vibration isolation characteristics. Depending on the frequency of vibration, resonance may occur between the cylindrical vibration isolators and the vibration may be further amplified. Therefore, in order to suppress the occurrence of such resonance, it is desirable to adjust the vibration isolation characteristics of each cylindrical vibration isolator so that the natural frequencies of the respective cylindrical vibration isolators do not overlap.

  However, in order to make such adjustments, when manufacturing each of the cylindrical vibration damping devices having the required vibration damping characteristics, it is necessary to manufacture a different cylindrical vibration damping device for each vehicle type or for each vehicle. Therefore, the increase in cost is inevitable. Such a problem is not limited to the above-described differential mount, and is generally common to cylindrical vibration isolators that connect each member via an elastic member such as a bush that connects the suspension and the vehicle body.

  The present invention has been made in view of the above circumstances, and its purpose is to change the vibration isolation characteristics during assembly and to easily adjust the vibration isolation characteristics in accordance with the use situation. To provide an apparatus.

In the following, means for achieving the above object and its effects are described.
The invention according to claim 1 is an outer cylinder fixed to one member of a pair of connected members, and is inserted into the outer cylinder and fixed to the other member of the pair of connected members. In the cylindrical vibration isolator, which is connected to the inner cylinder by an elastic member in a state of being separated in the radial direction and suppresses transmission of vibration between the pair of connected members by elastic deformation of the elastic member, Between the outer cylinders, the inner cylinder and the outer cylinder have a wedge-shaped cross section in which the wall thickness gradually increases toward one side in the extending direction of the central axis. The gist is that an adjustment member capable of adjusting the initial elastic force is interposed by compressing and deforming the elastic member in the radial direction.

  According to the said structure, the volume which an adjustment member occupies between an inner cylinder and an outer cylinder by moving the adjustment member interposed between the inner cylinder and the outer cylinder in the extending | stretching direction of a center axis | shaft. Changes, the elastic member interposed therein is compressed and deformed, and the amount of deformation changes depending on the position of the adjusting member. Therefore, the vibration isolation characteristics can be changed by moving the adjusting member when the vibration isolation apparatus is assembled, and the vibration isolation characteristics can be easily adjusted according to the use situation of the vibration isolation apparatus. Become.

  According to a second aspect of the present invention, in the cylindrical vibration isolator according to the first aspect, the adjustment member has a cylindrical shape and the outer peripheral surface thereof is in contact with the inner peripheral surface of the outer cylinder. An intermediate member is provided concentrically with the cylinder and the outer cylinder, and an intermediate member is provided between the inner cylinder and the adjustment member, the outer peripheral surface of which is in contact with the inner peripheral surface of the adjustment member. The intermediate member is positioned between the inner peripheral surface of the intermediate member and the outer peripheral surface of the inner cylinder, and is fixed to each of the surfaces. The contact portion between the outer peripheral surface of the adjustment member and the inner peripheral surface of the outer cylinder, and the intermediate A screw that is screwed by rotating the adjustment member around its central axis is formed on at least one of the contact portions between the outer peripheral surface of the member and the inner peripheral surface of the adjustment member. It becomes the gist.

  According to a third aspect of the present invention, in the cylindrical vibration isolator according to the first aspect, the adjustment member has a cylindrical shape and an inner peripheral surface thereof is in contact with an outer peripheral surface of the inner cylinder. The inner cylinder and the outer cylinder are concentrically arranged, and an intermediate member is provided between the outer cylinder and the adjustment member, the inner circumferential surface of which is in contact with the outer circumferential surface of the adjustment member. The member is located between the outer peripheral surface of the intermediate member and the inner peripheral surface of the outer cylinder, and is fixed to each of the surfaces, and a contact portion between the inner peripheral surface of the adjustment member and the outer peripheral surface of the inner cylinder; A screw that is screwed by rotating the adjusting member around its central axis is formed on at least one of the contact portions between the inner peripheral surface of the intermediate member and the outer peripheral surface of the adjusting member. It is the gist of what has been done.

  Specifically, according to the invention described in claim 2, an intermediate member is provided between the cylindrical adjustment member and the elastic member fixed to the outer peripheral surface of the inner cylinder, and the outer peripheral surface of the cylindrical adjustment member. A screw is formed on each peripheral surface of at least one of a portion where the outer peripheral surface of the intermediate member abuts and a portion where the outer peripheral surface of the intermediate member abuts on the inner peripheral surface of the adjustment member, and this is screwed Accordingly, the cylindrical vibration isolator can be formed by interposing the adjusting member between the outer cylinder and the intermediate member.

  According to a third aspect of the present invention, an intermediate member is provided between the cylindrical adjustment member and the elastic member fixed to the inner peripheral surface of the outer cylinder, and the inner peripheral surface of the adjustment member and the inner cylinder A screw is formed on each peripheral surface of at least one of a portion in contact with the outer peripheral surface and a portion in which the inner peripheral surface of the intermediate member and the outer peripheral surface of the adjustment member are in contact with each other, and the adjustment member is screwed on the screw. A cylindrical vibration isolator can also be formed by interposing between the inner cylinder and the intermediate member.

  According to the second and third aspects of the invention, by rotating the adjustment member around its central axis, the adjustment member is moved in the extending direction of the central axis of the outer cylinder and the inner cylinder by the action of the screw. Therefore, the vibration isolation characteristics can be easily changed.

  According to a fourth aspect of the present invention, in the cylindrical vibration isolator according to the second aspect, the intermediate member has an arc shape extending along the outer peripheral surface of the elastic member, and at least a part in the circumferential direction thereof. The gist is that a gap is formed between the divided ends.

  In a case where the adjustment member is interposed between the inner peripheral surface of the outer cylinder and the intermediate member fixed to the elastic member as described in the second aspect, the adjustment member is arranged on the central axis. When moved in the extending direction and entered between the inner cylinder and the outer cylinder, the intermediate member is deformed in the direction of reducing the diameter as the elastic member is compressed and deformed. In this regard, as in the invention described in claim 4, if the intermediate member is divided at least in a part in the circumferential direction, and a gap is formed between the divided ends, the intermediate member Can be easily deformed in the direction of reducing the diameter, and the load when the adjustment member is rotated in accordance with the change of the vibration isolation characteristic can be reduced.

  According to a fifth aspect of the present invention, in the cylindrical vibration isolator according to the third aspect, the intermediate member has an arc shape extending along the inner peripheral surface of the elastic member, and at least one in the circumferential direction thereof. The gist is that the part is divided.

  When the configuration in which the adjustment member is interposed between the outer peripheral surface of the inner cylinder and the intermediate member fixed to the elastic member as described in claim 3 is used, the adjustment member is extended along the central axis. When moved in the direction and entered between the inner cylinder and the outer cylinder, the intermediate member deforms in a direction in which the diameter of the intermediate member expands as the elastic member compresses and deforms. In this regard, as in the invention described in claim 5 above, if the intermediate member is divided in at least a part in the circumferential direction, the intermediate member is easily deformed in the direction of expanding the diameter, and the vibration-proof characteristic is changed. Accordingly, it is possible to reduce the load when the adjustment member is rotated.

  A sixth aspect of the present invention is the cylindrical vibration damping device according to the fourth or fifth aspect, wherein the elastic member is hollow at a portion corresponding to a portion where the intermediate member is divided in the circumferential direction. The gist is that the part is formed.

  Further, according to the invention described in claim 6, a configuration in which a hollow portion is formed in a portion corresponding to a portion where the intermediate member in the elastic member is divided in addition to the configuration described in claim 4 or 5. By adopting, it becomes possible to release the strain in the circumferential direction of the elastic member when the elastic member compressively deforms with the movement of the adjusting member to the hollow portion, and along with the change of the vibration isolation characteristics The load when the adjustment member is rotated can be further reduced.

  According to a seventh aspect of the present invention, in the cylindrical vibration isolator according to the first aspect, the adjustment member is disposed so as to surround the elastic member, and an inner peripheral surface thereof is fixed to an outer peripheral surface of the inner cylinder. The gist of the invention is that the screw is fixed to the elastic member and the screw formed on the outer peripheral surface thereof is screwed to the screw formed on the inner peripheral surface of the outer cylinder.

  The invention according to claim 8 is the cylindrical vibration isolator according to claim 1, wherein the adjustment member is disposed so as to surround the inner cylinder, and an outer peripheral surface thereof is an inner peripheral surface of the outer cylinder. The gist of the present invention is that the screw formed on the inner peripheral surface of the inner member is screwed to the screw formed on the outer peripheral surface of the inner cylinder.

  According to the invention described in claim 7 or 8, the elastic member is directly fixed to the adjusting member without providing an intermediate member, and the adjusting member and the outer cylinder or the inner cylinder are screwed together to dampen the vibration. It is also possible to adopt a configuration that forms a device.

(First embodiment)
A first embodiment in which a cylindrical vibration isolator according to the present invention is embodied as a differential mount that supports a differential of an automobile will be described below with reference to FIGS.

  FIGS. 1A and 1B show the manner in which the differential mount 10A according to this embodiment is assembled to the vehicle body. In FIG. 1A, the suspension member 30 to which the differential mount 10A is assembled is indicated by a two-dot chain line. 1B is a cross-sectional view taken along the line bb in FIG. 1A, and shows an enlarged connection portion between the differential mount 10A, the differential 20 and the suspension member 30. FIG.

  As shown in FIG. 1A, a differential 20 that transmits the driving force of an internal combustion engine to left and right wheels includes four differential mounts 10A, 10B, and a suspension member 30 that is a subframe constituting a part of the vehicle body. It is connected via 10C and 10D. Each of the differential mounts 10A, 10B, 10C, and 10D is a cylindrical vibration isolator in which an inner cylinder and an outer cylinder are connected by an elastic member.

  As shown in FIG. 1B, in the differential mount 10 </ b> A according to the present embodiment, the outer cylinder 12 positioned on the outer peripheral side is press-fitted into a mounting hole 30 a formed in the suspension member 30. On the other hand, the bottomed cylindrical inner cylinder 11 positioned on the inner peripheral side of the differential mount 10A is fastened to the differential 20 by a bolt 14 inserted through a bolt hole 11b formed in the bottom surface 11a. Thus, the differential mount 10 </ b> A has the inner cylinder 11 fixed to the differential 20 and the outer cylinder 12 fixed to the suspension member 30 to connect the differential 20 and the suspension member 30.

  Hereinafter, the configuration of the differential mount 10A will be described in more detail with reference to FIGS. 2 is an exploded perspective view of the differential mount 10A, FIG. 3 (a) is a top view of the differential mount 10A, and FIG. 3 (b) is a bb line direction of the differential mount 10A in FIG. 3 (a). FIG.

  As shown in the lower part of FIG. 2, an elastic member 13 made of an elastic body is vulcanized and bonded to the outer peripheral surface of the inner cylinder 11. As shown in FIG. 2, the elastic member 13 is divided into an elastic piece 13A and an elastic piece 13B, and the elastic piece 13A and the elastic piece 13B are bonded to the outer peripheral surface of the inner cylinder 11 by vulcanization. A predetermined gap is formed between them. The elastic pieces 13A and 13B are vulcanized and bonded to the outer peripheral surfaces of the elastic members 13 so that an arcuate intermediate member 15 made of a wedge-shaped thin plate whose thickness decreases toward the top in FIG. Has been. Similarly to the elastic member 13, the intermediate member 15 is also divided into a semicircular member 15A and a semicircular member 15B. As shown in FIG. 2, the semicircular member 15A is provided on the outer peripheral surface of the elastic piece 13A. A semicircular member 15B is fixed to the outer peripheral surface of 13B.

  Thus, the inner cylinder 11, the elastic member 13, and the intermediate member 15 are connected concentrically in this order around the central axis L of the inner cylinder 11, so that the inner cylinder 11 and the intermediate member 15 are interposed via the elastic member 13. A connected inner peripheral side member 18 is formed.

  Further, on the outside of the inner peripheral side member 18, a cylindrical outer cylinder 12 press-fitted into the suspension member 30 is externally fitted concentrically with the central axis L as the center. A flange 12a for positioning the differential mount 10A when pressed into the suspension member 30 is formed at the upper end of the outer cylinder 12 in FIG. 2 as shown in FIG.

  A cylindrical adjustment member 16 is interposed between the outer cylinder 12 fitted concentrically and the inner peripheral side member 18. As shown in FIG. 2, the adjustment member 16 has an inner peripheral surface 16a inclined so that its thickness gradually increases upward in FIG. 2, and has a wedge-shaped cross section. The outer peripheral surface 16b of the adjustment member 16 and the inner peripheral surface 12b of the outer cylinder 12 are formed with screws that are screwed together. Further, the inner peripheral surface 16 a of the adjustment member 16 and the outer peripheral surface 15 a of the intermediate member 15 in the inner peripheral side member 18 are formed with screws that are screwed together. As a result, the adjusting member 16 is rotated so that these screws are screwed together, so that the adjusting member 16 enters between the outer cylinder 12 and the inner peripheral side member 18, and the outer cylinder 12 and the inner peripheral side member are inserted. 18 are integrally connected to each other through the adjustment member 16.

  In the differential mount 10A formed in this way, as shown in FIG. 3A, the inner cylinder 11 and the outer cylinder 12 are connected via the elastic member 13 with a predetermined distance in the radial direction. It becomes a state. As a result, the outer cylinder 12 is press-fitted into the suspension member 30 as described above, and the inner cylinder 11 is fastened to the differential 20 by the bolts 14, whereby the differential 20 and the suspension member 30 are connected via the elastic member 13. It becomes connected. As a result, the vibration transmitted between the differential 20 and the suspension member 30 is attenuated by the elastic deformation of the elastic member 13.

  Further, in the differential mount 10A of the present embodiment, the adjusting member 16 having a wedge-shaped cross section is screwed between the outer cylinder 12 and the inner peripheral side member 18 by a screw. Therefore, when the adjustment member 16 is rotated and the adjustment member 16 is caused to enter between the outer cylinder 12 and the inner peripheral side member 18 as shown by an arrow in FIG. The volume occupied by the adjustment member 16 between the outer cylinder 12 and the outer cylinder 12 is increased, and the action of the inclined inner peripheral surface 16a of the adjustment member 16 as shown by the broken line arrows in FIGS. 3 (a) and 3 (b). The intermediate member 15 moves in the direction in which the diameter is reduced, and the elastic member 13 is compressed and deformed in the radial direction. That is, in the differential mount 10A of the present embodiment, the elastic member 13 can be deformed and its deformation amount can be arbitrarily changed by rotating the adjustment member 16.

  Thus, the effect | action by changing the deformation amount of the elastic member 13 in the differential mount 10A is demonstrated with reference to FIG. FIG. 4 is a graph showing the relationship between the deflection of the elastic member 13 and the load in the differential mount 10A of the present embodiment.

  As shown by the solid line in FIG. 4, the elastic member 13 is greatly deformed as a large load is input, and the deflection thereof is increased. However, as the deflection is increased, the deformation amount accompanying the increase in the load is decreased.

  Therefore, by rotating the adjusting member 16 and compressing and deforming the elastic member 13 in advance as described above, the elastic member 13 is deflected with respect to the same load as shown by a broken line in FIG. Becomes smaller. That is, according to the differential mount 10A of this embodiment, the adjustment member 16 is rotated to compress and deform the elastic member 13 in advance, and the initial elastic force of the elastic member 13 is adjusted by adjusting the amount of deformation. be able to.

According to the first embodiment described above, the following effects can be obtained.
(1) By moving the adjusting member 16 movably interposed between the inner cylinder 11 and the outer cylinder 12 in the extending direction of the central axis L, the adjusting member is provided between the inner cylinder 11 and the outer cylinder 12. The volume occupied by 16 changes, and the elastic member 13 interposed therein is compressed and deformed, and the amount of deformation varies depending on the position of the adjusting member 16. Therefore, the vibration isolation characteristics can be changed by moving the adjustment member 16 when the differential mount 10A is assembled, and the vibration isolation characteristics can be easily adjusted according to the use state of the differential mount 10A. Become.

  (2) Screws are formed on the inner peripheral surface 16 a and the outer peripheral surface 16 b of the cylindrical adjustment member 16, and the adjustment member 16 is interposed between the outer cylinder 12 and the intermediate member 15 of the inner peripheral side member 18. These are screwed together to form the differential mount 10A. According to such a configuration, by rotating the adjustment member 16 around the central axis L, the adjustment member 16 can be moved in the extending direction of the central axis L of the outer cylinder 12 and the inner cylinder 11 by the action of the screw. Thus, the anti-vibration characteristics of the differential mount 10A can be easily changed.

  In order to precisely change the deformation amount of the elastic member 13 by rotating the adjustment member 16, the advance angle of the screw formed on the inner peripheral surface 16a and the outer peripheral surface 16b of the adjustment member 16 is set to be small. Is desirable. Further, the smaller the advance angle of the screw is, the more the displacement of the adjusting member 16 due to the loosening of the screw accompanying the input of vibration can be suppressed.

  (3) In the differential mount 10A in which the adjusting member 16 is interposed between the inner peripheral surface 12b of the outer cylinder 12 and the intermediate member 15 fixed to the outer peripheral surface of the elastic member 13 as in the above embodiment. When the adjusting member 16 is inserted between the inner cylinder 11 and the outer cylinder 12, the intermediate member 15 is deformed in a direction of reducing the diameter as the elastic member 13 is compressively deformed. In this regard, in the above-described embodiment, the intermediate member 15 is divided into two in the circumferential direction, and a gap is formed between the divided ends. Therefore, the intermediate member 15 is easily deformed in the direction of reducing the diameter, and the load when the adjustment member 16 is rotated along with the change of the vibration isolation characteristics can be reduced.

  (4) Further, the elastic member 13 is also divided into two similarly to the intermediate member 15, and a predetermined gap is formed at a portion corresponding to the portion where the intermediate member 15 is divided to form a hollow portion. Is adopted. Therefore, it becomes possible to release strain in the circumferential direction of the elastic member 13 when the elastic member 13 is compressed and deformed along with the movement of the adjusting member 16 to the hollow portion, and adjust according to the change of the vibration isolation characteristics. The load when the member 16 is rotated can be further reduced.

The first embodiment can also be implemented in the following forms that are appropriately modified.
In the above embodiment, the contact portion between the outer peripheral surface 16b of the adjustment member 16 and the inner peripheral surface 12b of the outer cylinder 12 and the contact portion between the outer peripheral surface 15a of the intermediate member 15 and the inner peripheral surface 16a of the adjustment member 16 The structure which forms a screw in both is shown. On the other hand, if the adjustment member 16 can be held by the frictional force of these contact portions, the contact portion between the outer peripheral surface 16b of the adjustment member 16 and the inner peripheral surface 12b of the outer cylinder 12 and the intermediate member 15 A configuration in which a screw is formed on at least one of the contact portions between the outer peripheral surface 15a and the inner peripheral surface 16a of the adjustment member 16 may be employed.

Further, it is possible to adopt a configuration in which the elastic member 13 is deformed in advance by press-fitting the adjusting member 16 between the outer cylinder 12 and the inner cylinder 11 without forming a screw.
In the above embodiment, the intermediate member 15 is divided into two semicircular members 15A and 15B, and a gap is formed at the divided ends. However, the intermediate member 15 is at least a part in the circumferential direction. What is necessary is just to be divided in. Specifically, the intermediate member 15 is divided at one place in the circumferential direction, may be constituted by one member, or may be divided by three or more members. That is, if the intermediate member 15 is divided at least in part in the circumferential direction and a gap is formed between the end portions, the intermediate member 15 is deformed in a direction in which the diameter of the intermediate member 15 is reduced as the adjustment member 16 enters. The elastic member 13 can be easily deformed.

-Moreover, although the structure which divides | segments the elastic member 13 into two similarly to the intermediate member 15 was shown in the said embodiment, the hollow which absorbs the distortion | strain to the circumferential direction in the elastic member 13 without dividing | segmenting the elastic member 13 is shown. The structure which provides a part can also be employ | adopted. Even if the elastic member 13 is not provided with such a hollow portion, the vibration-proof characteristic of the differential mount 10A can be changed by moving the adjustment member 16 to deform the elastic member 13.
(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIGS. Since this embodiment differs from the first embodiment in the arrangement position of the adjustment member, the same members are only given the same reference numerals, and the detailed description thereof is omitted, focusing on the differences between the two. explain. 5A is a top view of the differential mount 10A according to the present embodiment, and FIG. 5B is a cross-sectional view of the differential mount 10A in the direction of the line bb in FIG. 5A.

  As shown in FIGS. 5A and 5B, the elastic member 13 is vulcanized and bonded to the inner peripheral surface of the outer cylinder 12. As shown in FIG. 5A, the elastic member 13 is divided into an elastic piece 13A and an elastic piece 13B, and is elastic with the elastic piece 13A in a state of being vulcanized and bonded to the inner peripheral surface of the outer cylinder 12. A predetermined gap is formed between the piece 13B. On the inner peripheral surface of each elastic piece 13A, 13B, as shown in FIG. 5 (b), an arcuate intermediate member 115 made of a thin plate having a wedge-shaped cross-section whose thickness decreases toward the top in FIG. 5 (b). Is vulcanized and bonded. The intermediate member 115 is divided into a semicircular member 115A and a semicircular member 115B. As shown in FIG. 5A, the semicircular member 15A is formed on the inner peripheral surface of the elastic piece 13A. Semicircular members 15B are fixed to the inner peripheral surface.

  The inner cylinder 11 is inserted inside the intermediate member 115 in a concentric shape with the central axis L of the outer cylinder 12 as the center. A cylindrical adjustment member 116 is interposed between the inner cylinder 11 and the intermediate member 115 inserted concentrically. As shown in FIG. 5 (b), the adjustment member 116 has an outer peripheral surface 116b inclined so that its thickness gradually increases upward in FIG. 5 (b), and has a wedge-shaped cross section. Yes. On the inner peripheral surface 116 a of the adjusting member 116 and the outer peripheral surface of the inner cylinder 11, screws that are screwed together are formed. Further, screws that are screwed to each other are formed on the outer peripheral surface 116 b of the adjustment member 116 and the inner peripheral surface of the intermediate member 115. In the differential mount 10 </ b> A of the present embodiment, these screws are respectively screwed to cause the adjustment member 116 to enter between the inner cylinder 11 and the intermediate member 115, and the inner cylinder 11 via the adjustment member 116. And the intermediate member 115 are integrally connected.

  As shown in FIG. 5A, even in the differential mount 10A of the present embodiment, the inner cylinder 11 and the outer cylinder 12 are separated by a predetermined distance in the radial direction via the elastic member 13 as in the first embodiment. Are connected in a separated state. As a result, the outer cylinder 12 is press-fitted into the suspension member 30 as described above, and the inner cylinder 11 is fastened to the differential 20 by the bolts 14, whereby the differential 20 and the suspension member 30 are connected via the elastic member 13. It becomes connected. As a result, the vibration transmitted between the differential 20 and the suspension member 30 is attenuated by the elastic deformation of the elastic member 13.

  Further, in the differential mount 10A of the present embodiment, the adjusting member 116 having a wedge-shaped cross section is screwed between the inner cylinder 11 and the intermediate member 115 with screws. Therefore, when the adjustment member 116 is rotated and the adjustment member 116 is moved between the inner cylinder 11 and the intermediate member 115 as shown by an arrow in FIG. The volume occupied by the adjusting member 116 between the cylinder 12 and the intermediate member 115 is increased by the action of the inclined outer peripheral surface 116b of the adjusting member 116 as shown by the broken line arrows in FIGS. 5 (a) and 5 (b). Moves in the direction in which the diameter of the elastic member 13 is increased, and the elastic member 13 is compressed and deformed in the radial direction. That is, even in the differential mount 10 </ b> A of the present embodiment, the elastic member 13 can be deformed and the amount of deformation can be arbitrarily changed by rotating the adjustment member 116.

According to the second embodiment described above, the following effects similar to (1) to (4) in the first embodiment can be obtained.
(1) By moving the adjustment member 116 interposed between the inner cylinder 11 and the outer cylinder 12 in the extending direction of the central axis L, the adjustment member is interposed between the inner cylinder 11 and the outer cylinder 12. The volume occupied by 116 changes, and the elastic member 13 interposed therein is compressed and deformed, and the amount of deformation changes depending on the position of the adjusting member 116. Therefore, the vibration-proof characteristic can be changed by moving the adjustment member 116 when the differential mount 10A is assembled, and the vibration-proof characteristic can be easily adjusted in accordance with the use state of the differential mount 10A. Become.

  (2) Screws are formed on the inner peripheral surface 116a and the outer peripheral surface 116b of the cylindrical adjustment member 116, and the adjustment member 116 is interposed between the inner cylinder 11 and the intermediate member 115. A differential mount 10A is formed by screwing. According to such a configuration, as in the first embodiment, the adjustment member 116 is rotated about its central axis L, and the adjustment member 116 is rotated by the action of the screw so that the adjustment member 116 is centered on the central axis L of the outer cylinder 12 and the inner cylinder 11. It becomes possible to move in the extending direction, and the vibration isolation characteristics of the differential mount 10A can be easily changed.

  In order to precisely change the deformation amount of the elastic member 13 by rotating the adjustment member 116, the advance angle of the screw formed on the inner peripheral surface 116a and the outer peripheral surface 116b of the adjustment member 116 is set to be small. Is desirable. Further, the smaller the advance angle of the screw, the more the displacement of the adjusting member 116 due to the loosening of the screw accompanying the input of vibration can be suppressed.

  (3) In the differential mount 10A in which the adjusting member 116 is interposed between the outer peripheral surface of the inner cylinder 11 and the intermediate member 115 fixed to the inner peripheral surface of the elastic member 13 as in the above embodiment. When the adjusting member 116 is moved in the extending direction of the central axis L and entered between the inner cylinder 11 and the outer cylinder 12, the intermediate member 115 expands in the direction in which the elastic member 13 is compressed and deformed. Deformed. In this regard, in the above-described embodiment, the intermediate member 115 is divided into two in the circumferential direction thereof, so that the intermediate member 115 is easily deformed in the direction of expanding the diameter, and the adjustment member 116 is changed along with the change of the vibration isolation characteristics. The load when rotating the can be reduced.

  (4) Further, the elastic member 13 is also divided into two like the intermediate member 115, and a predetermined gap is formed in a portion corresponding to the portion where the intermediate member 115 is divided to form a hollow portion. Is adopted. Therefore, it becomes possible to release strain in the circumferential direction of the elastic member 13 when the elastic member 13 is compressed and deformed along with the movement of the adjusting member 16 to the hollow portion, and adjust according to the change of the vibration isolation characteristics. The load when the member 116 is rotated can be further reduced.

In addition, the said 2nd Embodiment can also be implemented with the following forms which changed this suitably like the said 1st Embodiment.
A screw is formed on at least one of the contact portion between the inner peripheral surface 116a of the adjustment member 116 and the outer peripheral surface of the inner cylinder 11 and the contact portion between the inner peripheral surface of the intermediate member 115 and the outer peripheral surface 116b of the adjustment member 116. It is also possible to adopt a configuration that does this.

A configuration in which the elastic member 13 is deformed in advance by press-fitting the adjusting member 116 between the outer cylinder 12 and the inner cylinder 11 without forming a screw may be employed.
-Although the structure which divided | segmented the intermediate member 115 into the two semicircle members 115A and 115B was shown, the intermediate member 115 should just be divided | segmented in at least one part in the circumferential direction. If the intermediate member 115 is divided at least at a part in the circumferential direction, the intermediate member 115 is easily deformed in the direction in which the diameter of the intermediate member 115 expands as the adjustment member 116 enters, and the elastic member 13 can be easily deformed. It becomes like this.

-Moreover, although the structure which divides | segments the elastic member 13 into two similarly to the intermediate member 115 was shown, the structure which provides the hollow part which absorbs the bending | flexion to the circumferential direction in the elastic member 13 without dividing | segmenting the elastic member 13 Can also be adopted. Further, the elastic member 13 may not be provided with a hollow portion.
(Third embodiment)
The third embodiment will be described below with reference to FIGS. 6 (a) and 6 (b). Since this embodiment is different from the first embodiment in the arrangement position of the adjustment member, the description of the same member will be omitted only by assigning the same reference numeral, and the difference will be mainly described. . 6A is a top view of the differential mount 10A according to the present embodiment, and FIG. 6B is a cross-sectional view of the differential mount 10A in the direction of the line bb in FIG. 6A.

  In the first embodiment, the configuration in which the adjustment member 16 is interposed on the outer peripheral side of the elastic member 13 is shown. In the second embodiment, the configuration in which the adjustment member 116 is interposed on the inner peripheral side of the elastic member 13 is shown. On the other hand, in the differential mount 10A of the present embodiment, a pair of intermediate members 215 and 225 are provided inside the elastic member, and an adjustment member 216 is interposed between the pair of intermediate members 215 and 225. Yes.

  Specifically, as shown in FIGS. 6A and 6B, an inner peripheral elastic member 213 is vulcanized and bonded to the outer peripheral surface of the inner cylinder 11. As shown in FIG. 6A, the inner peripheral side elastic member 213 is divided into an elastic piece 213A and an elastic piece 213B, and the elastic piece 213A is vulcanized and bonded to the outer peripheral surface of the inner cylinder 11. A predetermined gap is formed between the elastic piece 213B. On the outer peripheral surface of each elastic piece 213A, 213B, as shown in FIG. 6 (b), an arc-shaped inner peripheral side intermediate portion made of a thin plate having a wedge-shaped cross section whose thickness becomes thinner upward in FIG. 6 (b). The member 215 is vulcanized and bonded. Similarly to the inner peripheral elastic member 213, the inner peripheral intermediate member 215 is divided into a semicircular member 215A and a semicircular member 215B, and the semicircular member 215A is provided on the outer peripheral surface of the elastic piece 213A. The semicircular members 215B are fixed to the outer peripheral surface of each.

  Thus, the inner cylinder 11 and the inner peripheral side intermediate member are connected concentrically in order from the inner cylinder 11, the inner peripheral side elastic member 213, and the inner peripheral side intermediate member 215 around the central axis L of the inner cylinder 11. An inner peripheral side member 218 is formed in which 215 is connected via an inner peripheral side elastic member 213.

  The outer cylinder 12 is fitted on the outer side of the inner peripheral member 218. As shown in FIGS. 6A and 6B, the outer peripheral side elastic member 223 is vulcanized and bonded to the inner peripheral surface of the outer cylinder 12. As shown in FIG. 6A, the outer peripheral side elastic member 223 is divided into an elastic piece 223A and an elastic piece 223B in the same manner as the inner peripheral side elastic member 213, and is added to the inner peripheral surface of the outer cylinder 12. A predetermined gap is formed between the elastic piece 223 </ b> A and the elastic piece 223 </ b> B in the state where the sulfur bonding is performed. On the inner peripheral surface of each elastic piece 223A, 223B, as shown in FIG. 6 (b), an arc-shaped outer peripheral side made of a cross-sectional wedge-shaped expanse plate whose thickness becomes thinner upward in FIG. 6 (b). The intermediate member 225 is vulcanized and bonded. The outer peripheral side intermediate member 225 is divided into a semicircular member 225A and a semicircular member 225B. A semicircular member 225A is provided on the inner peripheral surface of the elastic piece 223A, and a semicircular member is provided on the inner peripheral surface of the elastic piece 223B. 225B is fixed.

  The outer peripheral side intermediate member 225 fixed to the outer cylinder 12 through the outer peripheral side elastic member 223 in this manner is fitted concentrically to the inner peripheral side member 218 together with the outer cylinder 12. A cylindrical adjustment member 216 is interposed between the outer peripheral side intermediate member 225 that is externally fitted and the inner peripheral side intermediate member 215 of the inner peripheral side member 218. As shown in FIG. 6B, the adjusting member 216 has a wedge shape in which both the inner peripheral surface 216a and the outer peripheral surface 216b are inclined so that the thickness gradually increases upward in FIG. 6B. Has a cross section. On the inner peripheral surface 216a of the adjusting member 216 and the outer peripheral surface of the inner peripheral side intermediate member 215, screws that are screwed together are formed. Further, screws that are screwed to each other are formed on the outer peripheral surface 216 b of the adjustment member 216 and the inner peripheral surface of the outer peripheral side intermediate member 225. In the differential mount 10 </ b> A of the present embodiment, these screws are respectively screwed to cause the adjustment member 216 to enter between the intermediate members 215 and 225, and the inner cylinder 11 and the outer tube are interposed via the adjustment member 216. The cylinder 12 is integrally connected.

  As shown in FIG. 6A, even in the differential mount 10A of the present embodiment, the inner cylinder 11 and the outer cylinder 12 have diameters via the elastic members 213 and 223 as in the first and second embodiments. They are connected in a state separated by a predetermined distance in the direction. As a result, the outer cylinder 12 is press-fitted into the suspension member 30 as described above, and the inner cylinder 11 is fastened to the differential 20 by the bolts 14, whereby the differential 20 and the suspension member 30 are interposed via the elastic members 213 and 223. Are connected to each other. As a result, vibration transmitted between the differential 20 and the suspension member 30 is attenuated by elastic deformation of the elastic members 213 and 223.

  Further, in the differential mount 10A of this embodiment, when the adjustment member 216 is inserted between the pair of intermediate members 215 and 225, the volume occupied by the adjustment member 216 between the inner cylinder 11 and the outer cylinder 12 is increased. The inner peripheral side intermediate member 215 is reduced in diameter by the action of the inclined inner peripheral surface 216a and outer peripheral surface 216b of the adjusting member 216, as indicated by broken arrows in FIGS. 6 (a) and 6 (b). And the elastic members 213 and 223 are both compressed and deformed by moving in the direction in which the outer peripheral side intermediate member 225 is expanded. That is, even in the differential mount 10A of the present embodiment, by rotating the adjustment member 216, the elastic members 213 and 223 can be compressed and deformed, and the deformation amount can be arbitrarily changed.

According to the third embodiment described above, the following effects similar to the effects (1) to (4) in the first and second embodiments can be obtained.
(1) By moving the adjustment member 216 movably interposed between the inner cylinder 11 and the outer cylinder 12 in the extending direction of the central axis L, the adjustment member is provided between the inner cylinder 11 and the outer cylinder 12. The volume occupied by 216 changes, the elastic members 213 and 223 interposed therein are compressed and deformed, and the amount of deformation changes depending on the position of the adjusting member 216. Therefore, the vibration-proof characteristic can be changed by moving the adjustment member 216 when the differential mount 10A is assembled, and the vibration-proof characteristic can be easily adjusted according to the use state of the differential mount 10A. Become.

  (2) A screw is formed on the inner peripheral surface 216a and the outer peripheral surface 216b of the cylindrical adjustment member 216, and the adjustment member 216 is interposed between the inner peripheral side intermediate member 215 and the outer peripheral side intermediate member 225, and These screws are screwed together to form a differential mount 10A. According to such a configuration, as in the first and second embodiments, the adjustment member 216 is rotated about the central axis L by rotating the adjustment member 216 around the central axis L, whereby the adjustment member 216 is moved by the action of the screw. It becomes possible to move in the extending direction of the central axis L, and the anti-vibration characteristics of the differential mount 10A can be easily changed.

  In order to precisely change the deformation amount of the elastic member 13 by rotating the adjustment member 216, the advance angle of the screw formed on the inner peripheral surface 216a and the outer peripheral surface 216b of the adjustment member 216 is set to be small. Is desirable. Further, the smaller the advance angle of the screw, the more the displacement of the adjusting member 216 due to the loosening of the screw accompanying the input of vibration can be suppressed.

  (3) The inner peripheral side intermediate member 215 fixed to the outer peripheral surface of the inner peripheral side elastic member 213 and the outer peripheral side intermediate member 225 fixed to the inner peripheral surface of the outer peripheral side elastic member 223 as in the above embodiment. In the differential mount 10 </ b> A having the adjustment member 216 interposed therebetween, when the adjustment member 216 is moved in the extending direction of the central axis L to enter between the inner cylinder 11 and the outer cylinder 12, the elastic member As 213 and 223 are compressed and deformed, the inner peripheral side intermediate member 215 is reduced in diameter and the outer peripheral side intermediate member 225 is increased in diameter. In this respect, in the above embodiment, the inner peripheral side intermediate member 215 and the outer peripheral side intermediate member 225 are each divided into two in the circumferential direction, so that the intermediate members 215 and 225 are reduced in diameter or increased in diameter. It becomes easy to deform | transform and the load at the time of rotating the adjustment member 216 with the change of a vibration proof characteristic can be reduced.

  (4) Moreover, the elastic members 213 and 223 are also divided into two like the intermediate members 215 and 225, and a predetermined gap is formed at a portion corresponding to the portion where the intermediate members 215 and 225 are divided, The structure which forms a hollow part is employ | adopted. Therefore, the elastic members 213 and 223 are compressed and deformed along with the movement of the adjusting member 216 so that the strain in the circumferential direction of the elastic members 213 and 223 can be released to the hollow portion, and the vibration-proof characteristic is changed. Accordingly, it is possible to further reduce the load when the adjustment member 216 is rotated.

In addition, the said 3rd Embodiment can also be implemented with the following forms which changed this suitably similarly to the said 1st and 2nd embodiment.
At least one of the contact portion between the inner peripheral surface 216a of the adjustment member 216 and the outer peripheral surface of the inner peripheral side intermediate member 215 and the contact portion between the outer peripheral surface 116b of the adjustment member 116 and the inner peripheral surface of the outer peripheral side intermediate member 225. It is also possible to employ a configuration in which a screw is formed on the top.

  Further, it is possible to adopt a configuration in which the elastic members 213 and 223 are deformed in advance by press-fitting the adjusting member 216 between the inner peripheral side intermediate member 215 and the outer peripheral side intermediate member 225 without forming a screw.

  -Although the structure which each divides each intermediate member 215,225 into two semicircle members was shown, each intermediate member 215,225 should just be parted in at least one part in the circumferential direction. If the intermediate members 215 and 225 are divided at least in a part in the circumferential direction, the intermediate members 215 and 225 are easily deformed in the direction of reducing or expanding the diameter as the adjusting member 216 enters, and the elastic members 213 and 225 are easily deformed. 223 can be easily deformed.

  -Moreover, although the structure which divides | segments the elastic members 213 and 223 into two similarly to the intermediate members 215 and 225 was shown, it bends in the circumferential direction in the elastic members 213 and 223 without dividing the elastic members 213 and 223 The structure which provides the hollow part which absorbs can also be employ | adopted. Further, the elastic members 213 and 223 do not have to be provided with a hollow portion.

In addition, the said 1st-3rd embodiment can also be implemented with the following forms which changed this suitably.
-The structure of said each embodiment is combined and the structure which provides multiple adjustment members is also employable.

  ・ If the adjustment member having a wedge-shaped cross section is movably interposed between the inner cylinder and the outer cylinder, the adjustment member is moved so as to enter between the inner cylinder and the outer cylinder. Since the elastic member can be deformed to change the vibration-proof characteristic of the differential mount 10A, the shape and the like of the adjustment member can be changed as appropriate. For example, it is possible to employ a configuration in which the elastic member is directly fixed to the adjustment member without providing the intermediate member, and the vibration isolator is formed by screwing the adjustment member and the outer cylinder or the inner cylinder.

  Specifically, as shown in FIGS. 7A and 7B, the adjustment member 316 is directly vulcanized and bonded to the outer peripheral surface of the elastic member 13 vulcanized and bonded to the outer peripheral surface of the inner cylinder 11. As shown in FIG. 7B, the adjustment member 316 has an outer peripheral surface 316b inclined so that its thickness gradually increases upward in FIG. 7B, and has a wedge-shaped cross section. ing. The adjustment member 316 is desirably divided in the same manner as the intermediate member in the first to third embodiments. The outer cylinder 312 that is press-fitted into the suspension member 30 is inclined so that the inner circumferential surface 312 b faces the outer circumferential surface 316 b of the adjustment member 316, and the outer circumferential surface 316 b of the adjustment member 316 and the inner circumference of the outer cylinder 312. Screws that are screwed together are formed on the surface 312b. Accordingly, the adjusting member 316 is rotated in the extending direction of the central axis L by rotating the adjusting member 316 and screwing these screws.

  Even when such a configuration is adopted, the adjustment member 316 and the outer cylinder 12 are rotated relative to each other, whereby the adjustment member 316 is moved to the central axis L as shown by an arrow in FIG. It can be made to enter in the extending direction. As a result, the volume occupied by the adjustment member 316 between the inner cylinder 11 and the outer cylinder 12 is increased, and broken arrows in FIGS. 7A and 7B are caused by the action of the inclined outer peripheral surface 316b of the adjustment member 316. As shown, the elastic member 13 is compressed and deformed in the radial direction. That is, even when such a configuration is adopted, the elastic member 13 can be deformed and the amount of deformation can be arbitrarily changed, and an effect according to the first to third embodiments can be obtained. Of course, a configuration in which the adjustment member is disposed on the inner peripheral side so as to be screwed directly to the outer peripheral surface of the inner cylinder 11 may be applied.

  The adjustment member may not be cylindrical or arcuate, that is, the adjustment member only needs to have a wedge-shaped cross section, and this is between the outer cylinder and the inner cylinder connected by the elastic member. Any elastic member may be used as long as it can compress and deform the elastic member interposed therein.

  In the above embodiment, an example in which the present invention is embodied in the differential mount 10A that connects the automobile differential 20 to the vehicle body is shown, but the present invention is not limited to such a differential mount, and the inner cylinder and the outer cylinder The present invention can be applied to any cylindrical vibration isolator in which the two are connected by an elastic member. For example, in addition to the differential mount as described above, the present invention can be applied to an engine mount, a bush for connecting a suspension to a vehicle body, and the like.

(A) is a perspective view which shows the assembly | attachment aspect of the differential mount concerning the 1st Embodiment of this invention, (b) is sectional drawing of the differential mount. The disassembled perspective view of the differential mount concerning the embodiment. (A) is a top view of the differential mount according to the embodiment, (b) is a cross-sectional view of the differential mount. The graph which shows the relationship between the bending of the elastic member concerning the said differential mount, and a load. (A) is a top view of the differential mount concerning the 2nd Embodiment of this invention, (b) is sectional drawing of the differential mount. (A) is a top view of the differential mount concerning the 3rd Embodiment of this invention, (b) is sectional drawing of the differential mount. (A) is a top view of a differential mount according to a modified example, and (b) is a cross-sectional view of the differential mount.

Explanation of symbols

10A, 10B, 10C, 10D ... differential mount, 11 ... inner cylinder, 12 ... outer cylinder, 13 ... elastic member, 14 ... bolt, 15 ... intermediate member, 16 ... adjusting member, 20 ... differential, 30 ... suspension member.

Claims (8)

An outer cylinder fixed to one member of the pair of connected members and an inner cylinder inserted into the outer cylinder and fixed to the other member of the pair of connected members are separated in the radial direction. In the cylindrical vibration isolator which is connected by an elastic member in a state where the vibration is transmitted between the pair of connected members by elastic deformation of the elastic member,
Between the inner cylinder and the outer cylinder, the inner cylinder and the outer cylinder have a wedge-shaped cross section in which the thickness gradually increases toward one side in the extending direction of the central axis of the inner cylinder and the outer cylinder. An adjustment member capable of adjusting an initial elastic force by moving and compressing and deforming the elastic member in a radial direction is interposed. The adjusting member has a cylindrical shape and is arranged concentrically with the inner cylinder and the outer cylinder in a state where the outer peripheral surface is in contact with the inner peripheral surface of the outer cylinder.
An intermediate member is provided between the inner cylinder and the adjustment member, the outer peripheral surface of which is in contact with the inner peripheral surface of the adjustment member, and the elastic member is an outer peripheral surface of the inner member and the inner cylinder. Located between each surface and fixed to each surface,
In each peripheral surface in at least one of the contact portion between the outer peripheral surface of the adjustment member and the inner peripheral surface of the outer cylinder and the contact portion between the outer peripheral surface of the intermediate member and the inner peripheral surface of the adjustment member, The cylindrical vibration isolator according to claim 1, wherein a screw to be screwed is formed by rotating the adjusting member around a central axis thereof. The adjustment member has a cylindrical shape and is disposed concentrically with the inner cylinder and the outer cylinder in a state where the inner circumferential surface thereof is in contact with the outer circumferential surface of the inner cylinder.
An intermediate member is provided between the outer cylinder and the adjustment member so that an inner peripheral surface thereof is in contact with an outer peripheral surface of the adjustment member. Located between each surface and fixed to each surface,
In each peripheral surface in at least one of the contact portion between the inner peripheral surface of the adjustment member and the outer peripheral surface of the inner cylinder and the contact portion between the inner peripheral surface of the intermediate member and the outer peripheral surface of the adjustment member, The cylindrical vibration isolator according to claim 1, wherein a screw to be screwed is formed by rotating the adjusting member around a central axis thereof. The cylindrical vibration isolator according to claim 2,
The intermediate member has an arc shape extending along the outer peripheral surface of the elastic member, and at least a part in the circumferential direction is divided, and a gap is formed between the divided ends. A cylindrical vibration isolator. In the cylindrical vibration isolator according to claim 3,
The intermediate member has an arc shape extending along an inner peripheral surface of the elastic member, and at least a part of the intermediate member in the circumferential direction is divided. The cylindrical vibration isolator according to claim 4 or 5, wherein the elastic member is formed with a hollow portion at a portion corresponding to a portion where the intermediate member is divided in the circumferential direction. In the cylindrical vibration isolator according to claim 1,
The adjusting member is disposed so as to surround the elastic member, and an inner peripheral surface thereof is fixed to the elastic member fixed to the outer peripheral surface of the inner cylinder, and a screw formed on the outer peripheral surface is fixed to the outer member. A cylindrical vibration isolator characterized by being screwed to a screw formed on an inner peripheral surface of a cylinder. In the cylindrical vibration isolator according to claim 1,
The adjustment member is disposed so as to surround the inner cylinder, and an outer peripheral surface thereof is fixed to the elastic member fixed to the inner peripheral surface of the outer cylinder, and a screw formed on the inner peripheral surface of the adjustment member A cylindrical vibration isolator characterized by being screwed to a screw formed on an outer peripheral surface of an inner cylinder.

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