JP2008248947A - Cylindrical vibration damper and stopper rubber used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical damper in which a stopper rubber fitted to an inner tube member or a bracket is formed integrally with a stopper rubber fitted to an outer tube member without increasing the number of parts and manufacturing cost. <P>SOLUTION: This stopper rubber 20 comprises: a first stopper rubber 21 so fitted to the inner tube member 11 or the bracket 30 as to be axially separated from the axial end of the tubular member 121 of the outer tube member 12 between the axial end of the tubular part of the outer tube member and the bracket 30; a second stopper rubber 22 so fitted to the outer tube member 12 as to be separated from the bracket 30 between the outer tube member 12 and the bracket 30; and an extension member 23 connected to the first stopper rubber 21 and the second stopper rubber 22 by integral formation, extendable in the direction connecting the position of the connection thereof to the fist stopper rubber 21 and the position of the connection thereof to the second stopper rubber 22, and having an expansion ratio larger than the expansion ratios of the first stopper rubber 21 and the second stopper rubber 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylindrical vibration isolator and a stopper rubber used therefor.

As a conventional cylindrical vibration isolator, for example, there is one described in Japanese Patent No. 2659678 (Patent Document 1). The cylindrical vibration isolator described in Patent Literature 1 includes an inner cylinder member, an outer cylinder member, and a rubber elastic body that elastically connects them. Here, the inner cylinder member is attached to the engine or the like via a bracket. The bracket has a U-shape having a pair of opposed pieces, and the opposed pieces are attached to both ends of the inner cylinder member in the axial direction. Further, a stopper rubber is disposed between the axial end surface of the inner cylinder member and the inside of the pair of opposed pieces of the bracket. The stopper rubber is attached in an axial direction away from the axial end of the outer cylinder member. When the inner cylinder member and the outer cylinder member are relatively displaced in the axial direction, the outer cylinder member becomes the stopper rubber. By abutting, it functions as an axial stopper.
Japanese Patent No. 2659678

  As described above, the stopper rubber used in the cylindrical vibration isolator described in Patent Document 1 is attached to the inner side of the opposing piece of the bracket so as to contact the axial end of the outer cylinder member. In addition to this stopper rubber, it has been studied to further exert a function as a stopper by attaching another stopper rubber to the outer cylinder member and abutting against the bracket.

  However, one stopper rubber is attached to the inner cylinder member or the bracket, and the other stopper rubber is attached to the outer cylinder member. The inner cylinder member or bracket and the outer cylinder member are configured to be relatively movable. That is, one stopper rubber and the other stopper rubber must be formed separately. Therefore, there arises a problem that the number of parts increases and the manufacturing cost increases.

  The present invention has been made in view of such circumstances, and the stopper rubber attached to the inner cylinder member or the bracket and the stopper rubber attached to the outer cylinder member are integrated without increasing the number of parts and the manufacturing cost. It is an object of the present invention to provide a cylindrical vibration isolator that can be molded and a stopper rubber used therefor.

<Cylinder vibration isolator>
The cylindrical vibration isolator of the present invention includes an inner cylinder member, and a cylindrical portion that is formed in a cylindrical shape and is arranged coaxially or eccentrically so as to be spaced radially outward of the inner cylinder member. And an outer cylinder member attached to one of the vibration receiving side members, a rubber elastic body that elastically connects the outer peripheral surface of the inner cylinder member and the inner peripheral surface of the cylindrical portion of the outer cylinder member, and the inner cylinder member A bracket that is attached to the other end of the vibration source side member and the vibration receiving side member and engages with the tubular portion of the outer tubular member in the axial direction, and the shaft of the tubular portion The first stopper rubber attached to the inner cylinder member or the bracket so as to be axially separated from the axial end of the cylindrical portion between the directional end and the bracket, and between the outer cylindrical member and the bracket The second screw attached to the outer cylinder member so as to be separated from the bracket. The first stopper rubber is connected to the upper rubber, the first stopper rubber and the second stopper rubber by integral molding, and can be expanded and contracted in the direction connecting the connecting position to the first stopper rubber and the connecting position to the second stopper rubber. And an elastic member having an expansion / contraction rate larger than that of the second stopper rubber.

  Thus, the first stopper rubber is attached to the inner cylinder member or the bracket, and the second stopper rubber is attached to the outer cylinder member. The inner cylinder member and the bracket, and the outer cylinder member are relatively movable. Therefore, the first stopper rubber and the second stopper rubber move relatively as the inner cylinder member and the bracket and the outer cylinder member relatively move. And the 1st stopper rubber and 2nd stopper rubber which move relatively in this way are connected with the expansion-contraction member by integral molding. The expansion / contraction member can be expanded and contracted in a direction connecting the connecting position with the first stopper rubber and the connecting position with the second stopper rubber. Accordingly, when the first stopper rubber and the second stopper rubber move relative to each other, the expansion / contraction member expands / contracts to maintain the connection state between the first stopper rubber and the expansion / contraction member, and the second stopper rubber The connected state with the elastic member can be maintained. In this way, the first stopper rubber and the second stopper rubber are connected by the elastic member, so that they can be integrally formed. That is, two types of stopper rubbers can be integrally formed without increasing the number of parts and the manufacturing cost.

  Here, in the cylindrical vibration isolator of the present invention, the first stopper rubber contacts the axial end of the cylindrical portion when the inner cylindrical member and the cylindrical portion move relative to each other in the axial direction, The stopper rubber may be brought into contact with the bracket when the inner cylinder member and the cylindrical portion relatively move in a direction different from the axial direction.

  Thereby, the first stopper rubber can exhibit a function as a stopper in one of a plurality of different directions, and the second stopper rubber can exhibit a function as a stopper in the other direction. And the stopper rubber which exhibits the function as a stopper with respect to several different directions in this way can be integrally molded.

  In particular, in this case, the second stopper rubber is preferably in contact with the bracket when the inner cylindrical member and the cylindrical portion are relatively moved in the radial direction. That is, it can function as a stopper with respect to the orthogonal two-axis directions.

  Further, in the cylindrical vibration isolator of the present invention, the bracket has a U-shaped shape including a pair of opposed pieces, and the pair of opposed pieces are attached to both axial end portions of the inner cylindrical member, The stopper rubber is disposed between the one axial end of the cylindrical portion and one opposing piece of the bracket, and between the other axial end of the cylindrical portion and the other opposing piece of the bracket. Good.

  Thereby, the cylindrical part of the outer cylinder member is made to the inner cylinder member by the portion of the first stopper rubber that is disposed between the one axial end of the cylindrical part and the one opposing piece of the bracket. When moving in one axial direction, it functions as a stopper. Furthermore, of the first stopper rubber, the cylindrical portion of the outer cylindrical member is located with respect to the inner cylindrical member by the portion disposed between the other axial end of the cylindrical portion and the other opposing piece of the bracket. When moving in the other axial direction, it functions as a stopper. That is, the first stopper rubber can exhibit a function as a stopper with respect to the relative movement of the cylindrical portions of the inner cylinder member and the outer cylinder member in both axial directions.

  Moreover, in the cylindrical vibration isolator of the present invention, the expansion / contraction member may have a bellows shape. By forming the bellows shape, the thickness can be formed substantially the same, and in addition, a large tensile stress does not occur when stretched and deformed. Therefore, durability can be increased. In addition to the bellows-like shape, for example, the elastic member can be thinner than the first stopper rubber and the second stopper rubber, or can be formed with a through hole. However, from the viewpoint of durability, the above-described bellows shape is preferable.

  In the cylindrical vibration isolator of the present invention, the second stopper rubber may be attached so as to restrict relative movement with respect to the outer cylinder member. Thereby, the function as a stopper can be exhibited stably.

<Stopper rubber used in cylindrical vibration isolator>
Here, in the above description, the case where the present invention is regarded as a cylindrical vibration isolator has been described. In addition to this, the present invention can also be understood as a stopper rubber used in a cylindrical vibration isolator.

  That is, the stopper rubber used in the cylindrical vibration isolator includes an inner cylindrical member and a cylindrical portion that is formed in a cylindrical shape and is arranged coaxially or eccentrically spaced apart radially outward of the inner cylindrical member, An outer cylindrical member attached to one of the vibration source side member and the vibration receiving side member, a rubber elastic body that elastically connects the outer peripheral surface of the inner cylindrical member and the inner peripheral surface of the cylindrical portion of the outer cylindrical member; A bracket that is attached to the axial end of the inner cylindrical member and either the vibration source side member or the vibration receiving side member and engages the cylindrical portion of the outer cylindrical member in the axial direction. A stopper rubber used in a cylindrical vibration isolator provided with an inner cylinder so as to be axially spaced from the axial end of the cylindrical portion between the axial end of the cylindrical portion and the bracket. First stopper rubber attached to the member or bracket, outer cylinder member and bra The first stopper rubber and the second stopper rubber are connected by integral molding to the second stopper rubber attached to the outer cylinder member so as to be separated from the bracket between the first stopper rubber and the first stopper rubber. And a stretchable member that is stretchable in a direction connecting the position and the connection position to the second stopper rubber, and has a stretch rate larger than that of the first stopper rubber and the second stopper rubber.

  Thereby, two types of stopper rubbers can be integrally formed without increasing the number of parts and the manufacturing cost. Further, in the stopper rubber used in the cylindrical vibration isolator of the present invention, the other features of the above-described cylindrical vibration isolator of the present invention can be similarly applied. In this case, the same effect as described above is obtained.

  Next, the present invention will be described in more detail with reference to embodiments. The case where the cylindrical vibration isolator 1 of this embodiment is applied to an engine mount of a vehicle will be described. That is, the vibration source side member to which the cylindrical vibration isolator 1 is attached is an engine, and the vibration receiving side member is an engine frame.

<First embodiment>
(Configuration of cylindrical vibration isolator 1)
The configuration of the cylindrical vibration isolator 1 will be described. Here, first, after describing the respective configurations of the cylindrical vibration isolator body 10, the stopper rubber 20, and the bracket 30 that constitute the cylindrical vibration isolator 1, the cylindrical vibration isolator 1 in which these are assembled. explain.

(Configuration of cylindrical vibration isolator body 10)
The configuration of the cylindrical vibration isolator main body 10 will be described with reference to FIGS. 1 and 2. FIG. 1 is a front view of a cylindrical vibration isolator body 10. FIG. 2 is a right side view of FIG. 1, that is, a view seen from the axial direction of the inner cylinder member 11. Here, the vertical direction in FIGS. 1 and 2 corresponds to the vertical direction of the vehicle.

  As shown in FIGS. 1 and 2, the cylindrical vibration isolator main body 10 includes an inner cylinder member 11, an outer cylinder member 12, rubber elastic bodies 13 and 13, and positioning protrusions 14 and 15. The inner cylinder member 11 is made of metal and is formed in a cylindrical shape. And the internal thread is formed in the both ends of an axial direction among the internal peripheral surfaces of this inner cylinder member 11. As shown in FIG. These female screws are for fixing a first stopper rubber 21 and a bracket 30 of a stopper rubber 20 to be described later with bolts 40.

  The outer cylinder member 12 includes a cylindrical part 121 and a flange part 122. The cylindrical portion 121 is made of metal and is formed in a cylindrical shape having an inner diameter larger than the outer diameter of the inner cylindrical member 11. Further, the axial length of the cylindrical portion 121 is formed slightly smaller than the axial length of the inner cylindrical member 11. The cylindrical portion 121 is spaced radially outward from the inner cylinder member 11 so that the axial direction thereof is parallel to the axial direction of the inner cylinder member 11, and the shaft of the inner cylinder member 11 is separated. It is arranged at the center of the direction. Here, in a single state of the cylindrical vibration isolator body 10, that is, a state before the cylindrical vibration isolator 1 is attached to the engine and the engine frame, the axial center of the cylindrical portion 121 is the center of the inner cylinder member 11. It is largely displaced upward of the vehicle with respect to the shaft center. In other words, in this state, the cylindrical portion 121 is arranged so as to be greatly eccentric with respect to the inner cylindrical member 11. Of course, the cylindrical part 121 may be arrange | positioned coaxially with respect to the inner cylinder member 11, and may make the eccentric amount smaller.

  The flange portion 122 is fixed to the cylindrical portion 121 by welding and attached to an engine frame (not shown). The flange portion 122 is formed by bending a metal plate into a U-shape as shown in FIG. Specifically, the flange portion 122 includes a U-shaped connecting portion 122a and a pair of opposing pieces 122b and 122c.

  The left and right widths of the U-shaped connecting part 122 a in FIG. 2 are formed to be slightly smaller than the outer diameter of the cylindrical part 121. The U-shaped connecting portion 122a is located on the vehicle lower side, and has three circular through holes 122d. These through holes 122d are inserted with bolts (not shown) for attachment to the engine frame. Furthermore, the pair of facing pieces 122b and 122c of the flange portion 122 has an opening end side that is narrower in the left-right width in FIG. 1 than the U-shaped connecting portion 122a side. The left and right widths of FIG. 1 above the vehicles of the facing pieces 122b and 122c are substantially the same as the axial length of the cylindrical portion 121. The upper ends of the facing pieces 122b and 122c are welded to the outer peripheral surface of the tubular portion 121 so that the facing direction of the facing pieces 122b and 122c is orthogonal to the axial direction of the tubular portion 121. Further, a circular through hole 122e is formed in one of the opposing pieces 122b. A locking portion 223 of a second stopper rubber 22 described later is inserted into the through hole 122e.

  The rubber elastic bodies 13 and 13 elastically connect the outer peripheral surface of the inner cylindrical member 11 and the inner peripheral surface of the cylindrical portion 121 of the outer cylindrical member 12. Specifically, the rubber elastic bodies 13 and 13 are slightly lower than the center in the vehicle vertical direction on the left and right end surfaces in FIG. 1 of the outer peripheral surface of the inner cylindrical member 11 and the inner peripheral surface of the cylindrical portion 121. The left and right side portions are elastically connected to each other by vulcanization adhesion. Here, the rubber elastic body 13 is made of, for example, a rubber material generally used as an anti-vibration rubber, such as NR.

  The positioning protrusions 14 and 15 are formed on both end portions in the axial direction on the outer peripheral surface of the inner cylinder member 11. Specifically, the positioning protrusion 14 at the right end in FIG. 1 is formed at two locations, a portion protruding downward in FIG. 1 and a portion protruding rearward in FIG. Further, the positioning protrusion 15 at the left end portion in FIG. 1 is formed at two locations, a portion protruding downward in FIG. 1 and a portion protruding toward the near side in FIG. The positioning protrusions 14 and 15 are formed axially outward from the axial end surface of the outer cylinder member 12. Further, the positioning protrusions 14 and 15 are integrally formed with the rubber elastic body 13.

(Configuration when molding the stopper rubber 20)
Next, the structure at the time of shaping | molding the stopper rubber 20 is demonstrated with reference to FIGS. FIG. 3 is a front view of the stopper rubber 20 during molding. 4 is a cross-sectional view taken along line AA in FIG. 5 is a partial cross-sectional view taken along line BB in FIG. The state in which the stopper rubber 20 is assembled to the cylindrical vibration isolator body 10 will be described later.

  As shown in FIGS. 3 to 5, the stopper rubber 20 includes a first stopper rubber 21, a second stopper rubber 22, and an elastic member 23, which are integrally formed. The stopper rubber 20 is formed in a substantially flat plate shape as a whole.

  The first stopper rubber 21 includes a pair of main body portions 211 and 212 and a connecting portion 213 that connects the pair of main body portions 211 and 212. Each of the main body portions 211 and 212 is formed in a fan shape. The main body portions 211 and 212 include arc-shaped thick portions 211a and 212a that are fan-shaped outer peripheral portions, and thin-walled portions 211b and 212b that are central portions thereof. The outer diameters of the thick portions 211 a and 212 a are formed larger than the outer diameter of the cylindrical portion 121 of the outer cylindrical member 12. The inner diameters of the thick portions 211 a and 212 a are smaller than the inner diameter of the cylindrical portion 121 of the outer cylinder member 12. In addition, circular holes 211c and 212c are formed in the center of the thin portions 211b and 212b. The circular holes 211c and 212c have two concave portions 211d and 212d, respectively. The inner cylinder member 11 is inserted through the circular holes 211c and 212c. Further, the positioning protrusions 14 and 15 are engaged with the recesses 211d and 212d.

  The connection part 213 is formed in a substantially rectangular shape. The longitudinal length of the connecting portion 213 is slightly longer than the axial length of the tubular portion 121 of the outer tubular member 12. Then, both ends of the connecting portion 213 in the longitudinal direction are connected to the outer peripheral edge of the thick portion 211a of one main body portion 211 and the outer peripheral edge of the thick portion 212a of the other main body portion 212, respectively. Specifically, the connecting portion 213 has the thick portion 211a, so that the opening side of the thick portion 211a of the one main body portion 211 faces the opening side of the thick portion 212a of the other main body portion 212. 212a. Further, the width of the connecting portion 213 (the vertical width in FIG. 3) is sufficiently smaller than the outer diameter of the main body portions 211 and 212. Further, as shown in FIG. 5, concave grooves 213a and 213b are formed at both ends in the longitudinal direction of the connecting portion 213 in a direction orthogonal to the longitudinal direction, and opposite surfaces of the respective concave grooves 213a and 213b protrude. It is formed as follows. These concave grooves 213a and 213b are provided to facilitate bending of the main body portions 211 and 212 with respect to the connecting portion 213.

  The second stopper rubber 22 includes a plate-like base portion 221, a circular thick portion 222, and a locking portion 223. The base part 221 is a U-shaped flat plate. The base portion 221 has a size capable of covering the circular through hole 122e formed in the flange portion 122. The circular thick portion 222 is sufficiently thicker than the thickness of the base portion 221, and the circular bottom surface is coupled to one surface of the base portion 221. The circular thick portion 222 is slightly reduced in diameter from the base portion 221 side toward the distal end side. That is, the cross section obtained by cutting the circular thick portion 222 in the axial direction has a trapezoidal shape. The locking portion 223 is formed so as to protrude from the other surface of the base portion 221 in a bowl shape. The outer diameter of the base portion of the locking portion 223 is the same as or slightly smaller than the inner diameter of the circular through hole 122 e formed in the flange portion 122. Further, the outer diameter of the distal end portion of the locking portion 223 is larger than the inner diameter of the circular through hole 122e formed in the flange portion 122.

  The elastic member 23 has a shape in which a flat plate is formed in a bellows shape, and is connected to the first stopper rubber 21 and the second stopper rubber 22 by integral molding. The thickness of the elastic member 23 is substantially the same as the thickness of the connecting portion 213 of the first stopper rubber 21 and the base portion 211 of the second stopper rubber 22. The width of the elastic member 23 is the same as that of the base portion 221. Moreover, the bellows-like one end side of this expansion-contraction member 23 is connected to the longitudinal direction center part of the connection part 213 of the 1st stopper rubber 21 so that it may become the same plane shape. On the other hand, the bellows-like other end side of the elastic member 23 is connected to the base portion 221 of the second stopper rubber 22 so as to be in the same plane. That is, the expansion / contraction member 23 can be expanded and contracted in a direction (up and down direction in FIG. 3) connecting the connection position to the first stopper rubber 21 and the connection position to the second stopper rubber 22. Furthermore, since the expansion / contraction member 23 has a bellows shape, the expansion / contraction rate is sufficiently larger than the expansion / contraction rate of the first stopper rubber 21 and the second stopper rubber 22.

(Configuration of bracket 30)
Next, the configuration of the bracket 30 will be described with reference to FIGS. FIG. 6 is a front view of the bracket 30. FIG. 7 is a plan view of FIG. FIG. 8 is a right side view of FIG.

  As shown in FIGS. 6 to 8, the bracket 30 is made of a thicker metal than the above-described inner cylinder member 11 and the like, and is formed in a U shape. The U-shaped connecting portion 31 of the bracket 30 is formed in an elongated rectangular parallelepiped shape, and three circular through holes 31a are formed. These through holes 31a pass through bolts (not shown) for attachment to the engine. Further, the pair of U-shaped opposed pieces 32 and 33 of the bracket 30 are formed in a curved arc shape as shown in FIG. The distance between the opposing surfaces of the pair of opposing pieces 32 and 33 is a length obtained by adding both thicknesses of the thick portions 211 a and 212 a of the first stopper rubber 21 to the axial length of the cylindrical portion 121 of the outer cylindrical member 12. That is why it is slightly longer. Further, the distance between the opposed surfaces of the pair of opposed pieces 32 and 33 is shorter than the axial length of the inner cylinder member 11. Furthermore, one end side (the lower left side in FIG. 8) of the pair of opposed pieces 32 and 33 is coupled to the U-shaped coupling portion 31. Further, on the other end side (upper right side in FIG. 8) of the pair of opposed pieces 32 and 33, through holes 32a and 33a penetrating in a direction in which both are opposed to each other are formed. The through holes 32a and 33a are formed with a small diameter on the other facing pieces 32 and 33 side and a large diameter on the opposite side. The inner cylinder member 11 is inserted into the small diameter portions of the through holes 32a and 33a, and the head seat surface of the bolt 40 for connecting the bracket 30 and the inner cylinder member 11 is engaged with the large diameter portion. Match.

(Assembly state of each part of the cylindrical vibration isolator 1)
Next, the assembled state of each part of the cylindrical vibration isolator 1 will be described with reference to FIGS. 9 and 10. FIG. 9 is a front view of the tubular vibration isolator 1. FIG. 10 is a right side view of FIG.

  First, the first stopper rubber 21 of the stopper rubber 20 is attached to the cylindrical vibration isolator body 10. Specifically, the pair of main body portions 211 and 212 of the first stopper rubber 21 is bent about 90 degrees with respect to the connecting portion 213. At this time, the grooves 213a and 213b are positioned inside the bend. Thus, since the concave grooves 213a and 213b are formed, the main body portions 211 and 212 can be bent with respect to the connecting portion 213 very easily.

  Then, the one end portion of the inner cylinder member 11 is inserted through the circular hole 211 c of the main body portion 211 so that the concave portion 211 d of the one main body portion 211 is engaged with the positioning protrusion 14. Further, the other end of the inner cylinder member 11 is inserted through the circular hole 212 c of the main body 212 so that the recess 212 d of the other main body 212 is engaged with the positioning protrusion 15. That is, the first stopper rubber 21 has a U shape and is locked to both ends of the inner cylinder member 11. Here, since the longitudinal length of the connecting portion 213 is slightly longer than the axial length of the tubular portion 121 of the outer tubular member 12, the thick portion 211a of the pair of bent main body portions 211 and 212 is provided. , 212a is slightly spaced from the end surface of the cylindrical portion 121 of the outer cylinder member 12.

  Subsequently, the second stopper rubber 22 is attached to the cylindrical vibration isolator body 10. Specifically, the locking portion 223 of the second stopper rubber 22 is inserted into the circular through hole 122e formed in the flange portion 122 from the outside. Thereby, the one opposing piece 122b of the flange part 122 is clamped by the base part 221 of the second stopper rubber 22 and the tip part of the locking part 223. Therefore, the second stopper rubber 22 is fixed to one opposing piece 122b of the flange portion 122. Further, since the outer diameter of the base of the locking portion 223 is the same as or slightly smaller than the inner diameter of the circular through hole 122e formed in the flange portion 122, the second stopper rubber 22 is placed on the flange portion 122. On the other hand, it is fixed so as to restrict relative movement.

  Subsequently, the bracket 30 is attached to the inner cylinder member 11. Specifically, both axial ends of the inner cylinder member 11 are inserted into the small diameter portions of the through holes 32a and 33a formed in the pair of opposed pieces 32 and 33 of the bracket 30, respectively. At this time, the U-shaped connecting portion 31 of the bracket 30 is positioned so as to be spaced apart from the top surface of the circular thick portion 222 of the second stopper rubber 22. In this state, the bolt 40 is inserted into the through-holes 32a and 33a from the outside in the axial direction toward the inside of the inner cylinder member 11, and the head seating surface of the bolt 40 is placed on the large-diameter portion of the through-holes 32a and 33a. The internal thread formed on the inner cylinder member 11 is screwed until it comes into contact. In this way, the pair of opposed pieces 32 and 33 of the bracket 30 are attached to both end portions in the axial direction of the inner cylinder member 11.

  Finally, the bracket 30 is attached to the engine, and the flange portion 121 of the outer cylinder member 12 is attached to the engine frame. At this time, the inner cylinder member 11 and the bracket 30 are displaced downward (downward in FIGS. 9 and 10) relative to the outer cylinder member 12 due to the load of the engine. That is, the axial center of the inner cylinder member 11 and the axial center of the outer cylinder member 12 are close to each other as compared with the state before assembly. That is, in the state after assembly, the cylindrical portion 121 is arranged slightly eccentric with respect to the inner cylindrical member 11. Of course, the cylindrical part 121 may be arrange | positioned coaxially with respect to the inner cylinder member 11 in the state after an assembly | attachment.

  Thus, in the state where the cylindrical vibration isolator 1 is assembled, the following is obtained. First, one main body portion 211 of the first stopper rubber 21 is disposed between one axial end portion of the cylindrical portion 121 of the outer cylinder member 12 and one opposing piece 32 of the bracket 30. Further, the inner cylinder member 11 is displaced downward with respect to the outer cylinder member 12 by the load of the engine, so that the thick part 211a of the one main body part 211 is opposed to one axial end part of the cylindrical part 121. Located in. The thick portion 211a is separated from the axial end of the cylindrical portion 121 in the axial direction.

  The other main body portion 212 of the first stopper rubber 21 is disposed between the other axial end portion of the tubular portion 121 of the outer tubular member 12 and the other facing piece 33 of the bracket 30. Further, the inner cylinder member 11 is displaced downward with respect to the outer cylinder member 12 by the load of the engine, so that the thick part 212a of the other main body part 212 faces the other axial end part of the cylindrical part 121. Is located. The thick portion 212a is spaced apart from the other axial end of the tubular portion 121 in the axial direction.

  Therefore, each of the pair of main body portions 211 and 212 is in contact with both axial end portions of the cylindrical portion 121 when the inner cylindrical member 11 and the cylindrical portion 121 are relatively moved in the axial direction. It functions as a direction stopper.

  Further, the circular thick portion 222 of the second stopper rubber 22 is disposed between one opposing piece 122 b of the flange portion 122 of the outer cylinder member 12 and the U-shaped connecting portion 31 of the bracket 30. The circular thick part 222 of the second stopper rubber 22 is separated from the U-shaped connecting part 31 of the bracket 30. The separation direction between the circular thick portion 222 and the U-shaped connecting portion 31 of the bracket 30 is a direction orthogonal to the axial direction of the tubular portion 121. Therefore, the circular thick portion 222 is brought into contact with the U-shaped connecting portion 31 of the bracket 30 when the inner cylindrical member 11 and the cylindrical portion 121 are relatively moved in the radial direction. As a function.

  Further, the first stopper rubber 21 is attached to the inner cylinder member 11 or the bracket 30, and the second stopper rubber 22 is attached to the outer cylinder member 12. That is, the target member to which the first stopper rubber 21 and the second stopper rubber 22 are attached is a member that relatively moves. And the 1st stopper rubber 21 and the 2nd stopper rubber 22 which move relatively in this way are connected with the expansion-contraction member 23 by integral molding. The expansion / contraction member 23 can expand and contract in a direction connecting the connecting position with the first stopper rubber 21 and the connecting position with the second stopper rubber 22. Therefore, when the first stopper rubber 21 and the second stopper rubber 22 move relatively, the expansion / contraction member 23 expands / contracts, thereby maintaining the connection state of the first stopper rubber 21 and the expansion / contraction member 23, The connection state between the second stopper rubber 22 and the elastic member 23 can be maintained. As described above, the stopper rubber 20 can be integrally formed by connecting the first stopper rubber 21 and the second stopper rubber 22 by the elastic member 23. That is, the stopper rubber 20 that functions as two kinds of stoppers can be integrally formed without increasing the number of parts and the manufacturing cost.

<Other embodiments>
In the above embodiment, the cylindrical portion 121 and the flange portion 122 that constitute the outer cylindrical member 12 may be integrally formed of resin. As a result, the number of parts can be reduced and the weight can be reduced. In addition to the engine mount, the present invention can be applied to various vibration isolation devices.

It is a front view of the cylindrical vibration isolator main body. It is the figure seen from the axial direction of the inner cylinder member 11. It is a front view of the stopper rubber 20 at the time of molding. It is AA sectional drawing of FIG. It is a BB partial sectional view of FIG. 2 is a front view of a bracket 30. FIG. FIG. 7 is a plan view of FIG. 6. FIG. 7 is a right side view of FIG. 6. It is a front view of the cylindrical vibration isolator. FIG. 10 is a right side view of FIG. 9.

Explanation of symbols

1: Cylindrical vibration isolator,
10: Cylindrical vibration isolator body,
11: inner cylinder member,
12: outer cylinder member, 121: cylindrical part, 122: flange part,
122a: U-shaped connecting portion, 122b, 122c: a pair of opposing pieces,
122d: a through hole for mounting the engine frame,
122e: a through hole for attaching the second stopper rubber,
13: rubber elastic body, 14, 15: positioning protrusion,
20: Stopper rubber,
21: First stopper rubber,
211, 212: a pair of body parts,
211a, 212a: thick part, 211b, 212b: thin part,
211c, 212c: circular holes, 211d, 212d: recesses,
213: connecting portion, 213a, 213b: concave groove,
22: Second stopper rubber,
221: Base part, 222: Circular thick part, 223: Locking part, 23: Stretchable member,
30: bracket,
31: U-shaped connecting part, 31a: Through hole for engine mounting,
32, 33: a pair of opposing pieces, 32a, 33a: a through hole for attaching the inner cylinder member,
40: Bolt

Claims (7)

An inner cylinder member;
It has a cylindrical portion that is formed in a cylindrical shape and is arranged coaxially or eccentrically spaced apart radially outward of the inner cylindrical member, and is attached to either the vibration source side member or the vibration receiving side member. An outer cylinder member;
A rubber elastic body that elastically connects the outer peripheral surface of the inner cylindrical member and the inner peripheral surface of the cylindrical portion of the outer cylindrical member;
Attached to the axial end portion of the inner cylinder member and the other member of the vibration source side member and the vibration receiving side member, and engages with the cylindrical portion of the outer cylinder member in the axial direction. A bracket,
A first stopper rubber attached to the inner cylinder member or the bracket so as to be axially spaced from the axial end of the cylindrical part between the axial end of the cylindrical part and the bracket. When,
A second stopper rubber attached to the outer cylinder member so as to be spaced from the bracket between the outer cylinder member and the bracket;
It is connected to the first stopper rubber and the second stopper rubber by integral molding, and can be expanded and contracted in a direction connecting the connecting position to the first stopper rubber and the connecting position to the second stopper rubber, An elastic member having an expansion / contraction ratio larger than that of the stopper rubber and the second stopper rubber;
A cylindrical vibration isolator characterized by comprising: The first stopper rubber contacts the axial end of the cylindrical portion when the inner cylindrical member and the cylindrical portion are relatively moved in the axial direction;
2. The cylindrical vibration isolator according to claim 1, wherein the second stopper rubber abuts on the bracket when the inner cylindrical member and the cylindrical portion relatively move in a direction different from the axial direction.   The cylindrical vibration isolator according to claim 2, wherein the second stopper rubber abuts on the bracket when the inner cylindrical member and the cylindrical portion are relatively moved in the radial direction. The bracket has a U-shaped shape including a pair of opposed pieces, and the pair of opposed pieces are attached to both axial ends of the inner cylinder member,
The first stopper rubber is between the one axial end portion of the cylindrical portion and the one opposing piece of the bracket, and the other axial end portion of the cylindrical portion and the other opposing piece of the bracket. The cylindrical vibration isolator as described in any one of Claims 1-3 arrange | positioned between each.   The said expansion-contraction member is a cylindrical vibration isolator as described in any one of Claims 1-4 which consists of bellows shape.   The cylindrical vibration isolator according to any one of claims 1 to 5, wherein the second stopper rubber is attached so as to restrict relative movement with respect to the outer cylinder member. An inner cylinder member;
It has a cylindrical portion that is formed in a cylindrical shape and is arranged coaxially or eccentrically spaced apart radially outward of the inner cylindrical member, and is attached to either the vibration source side member or the vibration receiving side member. An outer cylinder member;
A rubber elastic body that elastically connects the outer peripheral surface of the inner cylindrical member and the inner peripheral surface of the cylindrical portion of the outer cylindrical member;
Attached to the axial end portion of the inner cylinder member and the other member of the vibration source side member and the vibration receiving side member, and engages with the cylindrical portion of the outer cylinder member in the axial direction. A bracket,
A stopper rubber used in a cylindrical vibration isolator comprising:
A first stopper rubber attached to the inner cylinder member or the bracket so as to be axially spaced from the axial end of the cylindrical part between the axial end of the cylindrical part and the bracket. When,
A second stopper rubber attached to the outer cylinder member so as to be spaced from the bracket between the outer cylinder member and the bracket;
It is connected to the first stopper rubber and the second stopper rubber by integral molding, and can be expanded and contracted in a direction connecting the connecting position to the first stopper rubber and the connecting position to the second stopper rubber, An elastic member having an expansion / contraction ratio larger than that of the stopper rubber and the second stopper rubber;
A stopper rubber used for a cylindrical vibration isolator characterized by comprising:

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