JP2022093170A - Vibration control device - Google Patents

Abstract

To provide a vibration control device in which a coming-off preventive structure preventing coming-off of a body rubber elastic member can be simply provided while keeping sufficient durability.SOLUTION: In a vibration control device 10, an inner member 12 and an outer member 14 are coupled by a body rubber elastic member 16 fitted in a cylinder portion 38 of the outer member 14 without bonding. The body rubber elastic member 16 is equipped with a pair of rubber legs 18 and 18 located at both sides of the inner member 12. A caulking projection 46 projecting out to an axial end surface of the cylinder portion 38 is inserted into a caulking hole 54 of an annular plate 36 to be caulked and fixed. The plate 36 fixed to the axial end surface of the cylinder portion 38 is overlapped on outer peripheral end portions of the pair of rubber legs 18 and 18 in an axial direction, and the outer peripheral end portions of the pair of rubber legs 18 and 18 are positioned in the axial direction by the plate 36. A caulking fixing portion 58 by the caulking projection 46 is arranged at a position corresponding to a maximum input position to the plate 36 by pressing the pair of rubber legs 18 and 18.SELECTED DRAWING: Figure 1

Description

The present invention relates to an anti-vibration device used, for example, as an engine mount, a motor mount, a differential mount, or the like of an automobile.

Conventionally, as in Japanese Patent Application Laid-Open No. 2015-001271 (Patent Document 1), a vibration isolator having a structure in which an inner member and an outer member are connected by a rubber elastic body of the main body has been known. Has been adopted as.

By the way, in Patent Document 1, the rubber elastic body of the main body is non-fixed and fitted to the tubular portion of the outer member, and the press-fitting metal fitting provided with the retaining protrusion for preventing the elastic rubber body of the main body from coming off is described. It is press-fitted and fixed to the cylinder of the outer member.

Japanese Unexamined Patent Publication No. 2015-001271

However, since the press-fitting metal fitting is press-fitted substantially uniformly over the entire circumference of the cylinder of the outer member, the part of the press-fitting metal fitting where a large load is applied due to the deformation of the main body rubber elastic body and the deformation of the main body rubber elastic body. The fixing strength to the outer member is substantially the same in the portion where the input load is relatively small. Therefore, if the fixing strength is set so that sufficient load-bearing performance (durability) is exhibited to prevent the press-fitting metal fittings from falling off from the outer member at a large load input site, an excessive fixing force is applied at a site where the input load is small. Has been activated, and a new problem has been clarified that a large force is required for the work of press-fitting and fixing the press-fitting metal fitting to the outer member.

An object of the present invention is to provide a vibration isolator having a novel structure, which can easily provide a retaining structure for preventing the rubber elastic body of the main body from coming off while having sufficient durability.

Hereinafter, preferred embodiments for grasping the present invention will be described, but each of the embodiments described below is described as an example, and not only can be appropriately combined with each other and adopted, but also described in each embodiment. The plurality of components of the above can be recognized and adopted independently as much as possible, and can be appropriately adopted in combination with any of the components described in another embodiment. Thereby, in the present invention, various other embodiments can be realized without being limited to the embodiments described below.

The first aspect is a vibration isolator in which the inner member is arranged in the tubular portion of the outer member, and the inner member and the outer member are connected by a rubber elastic body of the main body which is fitted into the tubular portion without adhesion. The main body rubber elastic body is provided with a pair of rubber legs extending in the opposite direction of the inner member and the tubular portion on both sides of the inner member, and the tubular portion is provided at one end of the tubular portion in the axial direction. A locking protrusion is provided on the outer peripheral end of the pair of rubber legs that protrudes toward the inner circumference of the rubber leg and is overlapped in the axial direction. , The plate is inserted into the caulking hole of the annular plate superimposed on the other end surface in the axial direction of the cylinder portion and caulked and fixed to the plate, and the plate fixed to the cylinder portion is the outer peripheral end of the pair of rubber legs. The outer peripheral end portion of the pair of rubber legs is axially positioned between the locking protrusion and the plate, and is axially superposed on the portion, and the caulking protrusion and the caulking fixing portion are provided by the caulking hole. Are arranged at positions corresponding to the maximum input positions with respect to the plate by pressing the outer peripheral end portions of the pair of rubber legs.

According to the anti-vibration device having a structure according to this aspect, it is possible to prevent the rubber elastic body of the main body from coming off from the tubular portion by the plate superposed on the axial end face of the tubular portion. The plate is easily fixed to the cylinder portion with a relatively small force by caulking and fixing the caulking protrusion of the cylinder portion inserted into the caulking hole of the plate to the plate portion.

The arrangement of the caulking fixing part where the cylinder part and the plate are fixed by caulking is set for the pair of rubber legs of the main body rubber elastic body, and the force exerted on the plate by pressing the pair of rubber legs is the maximum. The caulking fixing part is arranged at the position corresponding to the maximum input position. As a result, the fixing strength between the cylinder portion and the plate by the caulking fixing portion is greatly exhibited in the portion where the input to the plate is large. Therefore, it is possible to efficiently fix the cylinder and the plate with a small number of caulking fixing parts, and while reducing the force required for caulking fixing and making it easy to manufacture, it is excellent due to the high fixing strength of the cylinder and the plate. Durability can be achieved and the plate can be prevented from falling off from the cylinder.

In the second aspect, in the vibration isolator described in the first aspect, the caulking fixing portion is arranged on the extension of the pair of rubber legs toward the outer peripheral side.

According to the anti-vibration device having a structure according to this embodiment, by arranging the caulking fixing portion on the extension to the outer peripheral side of the pair of rubber legs, the input to the plate by pressing the pair of rubber legs is maximized. The caulking fixing portion can be easily arranged at the position corresponding to the position.

In the third aspect, in the vibration isolator described in the second aspect, the caulking fixing portion is provided at both end portions of the rubber legs in the circumferential direction of the tubular portion.

According to the anti-vibration device having a structure according to this embodiment, by providing caulking fixing portions on the extensions of both ends in the circumferential direction of the rubber legs, for example, a pair of rubber legs face each other between the inner member and the outer member. When a radial vibration perpendicular to the direction is input and the rubber leg exerts an axially outward force on the plate at the end on the compression side, the force exerted by the rubber leg deformed by compression on the plate is rubber. It is maximum on the outside of the center of the circumference of the leg. Therefore, by providing the caulking fixing portions at both ends of the rubber legs in the circumferential direction of the cylinder portion, the caulking fixing portions are arranged corresponding to the positions where the force exerted on the plate from the rubber legs deformed by the above input is maximized. Can be realized.

A fourth aspect is the vibration isolator according to the third aspect, wherein each rubber leg opens to the outer peripheral surface of the central portion of the rubber leg in the circumferential direction of the tubular portion, and the rubber leg is pivoted. It is provided with a concave groove penetrating in the direction.

According to the anti-vibration device having a structure according to this embodiment, caulking fixing portions are arranged at input positions from each portion of the rubber legs divided in the circumferential direction by the concave groove to the plate, and the fixing strength of the plate to the cylinder portion is provided. Can be secured at the input position.

A fifth aspect is that in the vibration isolator according to any one of the first to fourth aspects, a stopper rubber is provided between the pair of rubber legs in the circumferential direction of the tubular portion. The caulking fixing portion is arranged so as to be offset from the extension of the stopper rubber in the circumferential direction of the tubular portion.

According to the anti-vibration device having a structure according to this embodiment, the shaft direct stopper limits the relative displacement amount of the inner member and the outer member in the direction perpendicular to the axis by the contact between the inner member and the outer member via the stopper rubber. A mechanism is configured to prevent excessive deformation of the rubber legs, thereby improving durability.

The position where the stopper rubber is provided is between the circumferential direction of the pair of rubber legs, and is separated from the position where the input from the pair of rubber legs to the plate is maximized. Therefore, by arranging the caulking fixing portion off the extension to the outer circumference of the stopper rubber, the caulking fixing portion is efficiently arranged without providing an unnecessarily large number of caulking fixing portions, and the cylinder portion and the plate can be fixed. Excellent durability can be obtained while making it easy.

A sixth aspect is that in the vibration isolator according to the fifth aspect, the plate does not protrude inward from the tubular portion at the position where the stopper rubber is arranged.

According to the anti-vibration device having a structure according to this aspect, even if the stopper rubber bulges in the axial direction of the cylinder portion, the stopper rubber does not come into contact with the plate, and an axial outward force is applied from the stopper rubber to the plate. Is not reached. Therefore, even if the caulking fixing portion is not provided at the position where the stopper rubber is provided, it is difficult to affect the fixing strength required for fixing the cylinder portion and the plate, and a sufficient fixing strength is efficiently provided by a small caulking fixing portion. Can be obtained.

By the way, as in the case of the vibration isolator according to the first to sixth aspects, when the retaining structure of the rubber elastic body of the main body is provided by the plate that is crimped and fixed in a state of being overlapped with the tubular portion of the outer member, the inner member and the inner member are provided. In the axial stopper that limits the amount of relative displacement of the outer member in the axial direction, a new problem has arisen in which the stopper contact surface on the outer member side becomes narrow. That is, when a step is created between the surface of the plate overlapped with the cylinder portion and the surface of the adjacent portion of the outer member adjacent to the cylinder portion by stacking the plate on the cylinder portion of the outer member, a flat stopper is applied. It was difficult to secure a large contact surface.

In response to such a new problem, the seventh aspect is the main body rubber in which the inner member is arranged in the tubular portion of the outer member, and the inner member and the outer member are fitted into the tubular portion without adhesion. A vibration isolator connected by an elastic body, which protrudes toward the inner circumference of the tubular portion at one end of the tubular portion in the axial direction and axially to the outer peripheral end of the rubber elastic body of the main body. A locking protrusion to be overlapped is provided, and a caulking protrusion projecting from the other end face of the tubular portion in the axial direction is inserted into a caulking hole of the plate superimposed on the other end surface of the tubular portion in the axial direction. The plate fixed to the plate by caulking is vertically overlapped with the outer peripheral end portion of the main body rubber elastic body, and the outer peripheral end portion of the main body rubber elastic body is locked. It is positioned axially between the protrusion and the plate, and the adjacent portion of the outer member adjacent to the tubular portion protrudes from the tubular portion to the other axially by the thickness of the plate, and the tubular portion The surface of the plate overlapped with the other end surface in the axial direction is located on the same plane as the surface of the adjacent portion, and the outer member side constituting the axial stopper mechanism by contact with the inner member side. The stopper contact surface is provided so as to straddle the surfaces of both the adjacent portion and the plate.

According to the anti-vibration device having a structure according to this embodiment, the surface of the adjacent portion of the outer member protrudes from the surface of the tubular portion to the other side in the axial direction, and the surface of the plate superimposed on the tubular portion is the adjacent portion. It is designed to be located on the same plane as the surface. Therefore, in a structure in which a plate is superposed on the axial end surface of the tubular portion and crimped and fixed, it is possible to secure a flat stopper contact surface over a wide area by the cooperation between the surface of the plate and the surface of the adjacent portion. can.

In the eighth aspect, in the vibration isolator according to the seventh aspect, a cushioning rubber is superposed on the stopper contact surface, and the cushioning rubber straddles the surfaces of both the adjacent portion and the plate. It is provided in the above.

According to the anti-vibration device having a structure according to this aspect, for example, when the surface of the plate and the surface of the adjacent portion form a minute step due to a dimensional tolerance in manufacturing or the like, the cushioning rubber is adjacent to the surface of the plate. By being superposed over the surface of the portion, it is possible to prevent the stopper load from acting unevenly on the plate or the adjacent portion due to the step.

A ninth aspect is the vibration isolator according to the seventh or eighth aspect, wherein the stopper contact surface is provided at a position outside the caulking hole in the circumferential direction of the plate.

According to the anti-vibration device having a structure according to this aspect, it is possible to avoid providing unevenness due to the caulking hole or the caulking protrusion on the stopper contact surface, and it is possible to obtain a flat stopper contact surface.

According to the present invention, a retaining structure for preventing the rubber elastic body of the main body from coming off can be easily provided while having sufficient durability.

Front view showing anti-vibration mount as the first embodiment of the present invention. II-II sectional view of FIG. Section III-III sectional view of FIG. An exploded perspective view of the anti-vibration mount shown in FIG. A perspective view showing the anti-vibration mount shown in FIG. 1 with the inner bracket attached. Front view of anti-vibration mount with inner bracket shown in FIG. VII-VII sectional view of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 4 show an anti-vibration mount 10 for an automobile as a first embodiment of an anti-vibration device having a structure according to the present invention. The anti-vibration mount 10 is applied to, for example, an engine mount, a motor mount, or the like of an automobile, and a power unit including an engine, a motor, or the like is anti-vibratedly connected to a vehicle body. The anti-vibration mount 10 has a structure in which the inner member 12 and the outer member 14 are elastically connected by a main body rubber elastic body 16. In the following description, as a general rule, the vertical direction means the vertical direction in FIG. 1, the left-right direction means the left-right direction in FIG. 1, and the front-back direction means the left-right direction in FIG. 2. Further, as a general rule, the circumferential direction is the circumferential direction of the cylinder portion 38 (described later) of the inner member 12 and the outer member 14, and the axial direction is the axial direction of the cylinder portion 38 of the inner member 12 and the outer member 14. , Each say.

The inner member 12 is a highly rigid member made of, for example, a metal or the like, and has a substantially cylindrical shape extending linearly in the front-rear direction as shown in FIGS. 2 and 3.

The inner member 12 is vulcanized and adhered to the inner peripheral end portion of the rubber elastic body 16 of the main body. The main body rubber elastic body 16 includes a pair of left and right rubber legs 18, 18. The rubber legs 18 are provided so as to project outward from the inner member 12 in the left-right direction, and the width dimension in the circumferential direction (width dimension in the vertical direction) gradually increases toward the outside in the left-right direction. The rubber leg 18 is provided with a concave groove 20 that opens on the outer peripheral surface and penetrates in the axial direction. The rubber leg 18 has a shape that is bifurcated with the concave groove 20 in between, and is a branch upper portion 22 in which the upper portion of the concave groove 20 is inclined upward toward the outer periphery, and the rubber leg 18 is larger than the concave groove 20. The lower portion is a branch lower portion 24 that tilts downward toward the outer periphery. The concave groove 20 is provided in the central portion of the rubber leg 18 in the circumferential direction of the inner member 12, and the branch upper portions 22 and 22 and the branch lower portions 24 and 24 have a substantially vertically symmetrical shape. The inner ends of the pair of rubber legs 18 and 18 in the left-right direction are fixed to the inner member 12. Further, the main body rubber elastic body 16 includes a fitting rubber 26 that covers the inner peripheral surface of the inner member 12, and the fitting rubber 26 is integrated with the pair of rubber legs 18 and 18. A bracket mounting hole 28 that penetrates in the front-rear direction is formed on the inner circumference of the fitting rubber 26. The bracket mounting hole 28 can be regarded as an inner hole of the inner member 12 covered with the fitting rubber 26. The pair of rubber legs 18 and 18 have a symmetrical shape in the present embodiment, but may have asymmetrical shapes different from each other.

The main body rubber elastic body 16 includes an upper stopper rubber 30 and a lower stopper rubber 32 between the pair of rubber legs 18 and 18 in the circumferential direction. The upper stopper rubber 30 is provided between the branch upper portions 22 and 22 of the pair of rubber legs 18 and 18, and protrudes upward from the inner member 12. The tip surface of the upper stopper rubber 30 is located on the inner circumference of the tip surface of the rubber leg 18, and the protrusion height of the upper stopper rubber 30 from the inner member 12 is the maximum protrusion height of the rubber leg 18. It is made smaller than the protruding height of the upper portion 22. The lower stopper rubber 32 is provided between the branch lower portions 24 and 24 of the pair of rubber legs 18 and 18, and protrudes downward from the inner member 12. The tip surface of the lower stopper rubber 32 is located on the inner circumference of the tip surface of the rubber leg 18, and the protrusion height of the lower stopper rubber 32 from the inner member 12 is the maximum protrusion height of the rubber leg 18. It is made smaller than the protruding height of the lower part 24.

The main body rubber elastic body 16 of the present embodiment has a pair of rubber legs 18 and 18 protruding from the inner member 12 to both sides in the left-right direction, an upper stopper rubber 30 protruding upward from the inner member 12, and a lower part from the inner member 12. It is integrally provided with a lower stopper rubber 32 that protrudes toward. The main body rubber elastic body 16 is formed as an integrally vulcanized molded product including an inner member 12.

The main body rubber elastic body 16 is attached to the outer member 14 without adhesion. The outer member 14 is a highly rigid member made of metal, a fiber reinforced synthetic resin, or the like. The outer member 14 has a structure in which the plate 36 is attached to the outer main body 34. The outer main body 34 integrally includes a tubular portion 38 to which the main body rubber elastic body 16 is attached and a mounting portion 40 extending downward from the tubular portion 38.

The tubular portion 38 has a substantially cylindrical shape extending in the front-rear direction, and is provided with a main body rubber mounting hole 42 penetrating in the axial direction. The rubber mounting hole 42 of the main body gradually increases in diameter from the rear end (right end in FIG. 2) to the front end (left end in FIG. 2), and the inner peripheral surface has a punching taper, so that the tubular portion 38 Molding is easy. At one end (rear) of the tubular portion 38 in the axial direction, locking protrusions 44, 44 projecting toward the inner circumference are integrally formed. The locking protrusion 44 is partially provided in the circumferential direction. In the present embodiment, the locking protrusions 44 and 44 are provided on both sides in the left-right direction, and the locking protrusions are formed so that the opening on the front side of the tubular portion 38 has an elliptical shape with the long axis in the vertical direction. It is partially blocked by parts 44, 44.

A caulking protrusion 46 projects from the end surface of the tubular portion 38 on the other side (front) in the axial direction. The caulking protrusions 46 have a small-diameter columnar shape, and are provided at four locations separated from each other in the circumferential direction. The caulking protrusion 46 is arranged at a position off the center of the tubular portion 38 in the vertical direction and the center in the horizontal direction.

The mounting portion 40 has a thick, substantially plate-like shape, is integrally formed with the tubular portion 38, and projects downward from the tubular portion 38. The width dimension of the mounting portion 40 in the left-right direction increases downward. The mounting portion 40 is provided with screw holes (not shown) that open on the lower surface at both end portions in the left-right direction, and is mounted on a vehicle body or the like (not shown) by bolts (not shown) screwed into the screw holes. The upper end portion of the mounting portion 40 adjacent to the tubular portion 38 is an adjacent portion 48. The adjacent portion 48 is a plane whose front surface extends orthogonally to the front-rear direction. The front surface of the adjacent portion 48 is located in front of the front surface of the cylinder portion 38, and has a step with respect to the front surface of the cylinder portion 38. The adjacent portion 48 is provided with cushion rubber mounting holes 50 having a circular cross section that open in the front surface at two locations that are separated from each other in the left-right direction (see FIG. 4). The structure of the mounting portion 40 can be appropriately changed depending on, for example, the mounting structure on the vehicle body. Specifically, for example, in the present embodiment, the mounting portion 40 having a structure that can be fixed to the vehicle body by a screw hole is exemplified, but a planting bolt for fixing to the vehicle body may be provided in the mounting portion. ..

As shown in FIGS. 2 and 3, a main body rubber elastic body 16 is attached to the outer main body 34. The main body rubber elastic body 16 is inserted into the main body rubber mounting hole 42 of the tubular portion 38 from the rear end opening of the tubular portion 38, and is attached to the tubular portion 38 without adhesion. In the main body rubber elastic body 16, the tip surfaces of the branch upper portion 22 and the branch lower portion 24 of the pair of rubber legs 18 and 18 are pressed against the inner peripheral surfaces of the tubular portion 38, respectively, and are elastic in the main body rubber mounting hole 42. The pair of rubber legs 18 and 18 are pre-compressed in the radial direction when mounted on the tubular portion 38. The main body rubber elastic body 16 is at a position where the tip portions, which are the outer peripheral ends of the pair of rubber legs 18, 18 overlap, in the axial (front-back direction) projection with respect to the locking protrusions 44, 44 of the tubular portion 38. It is arranged, and the amount of movement in the insertion direction with respect to the tubular portion 38 is limited by the contact with the locking protrusions 44 and 44. The locking protrusions 44, 44 may be in axial contact with the tip portions of the pair of rubber legs 18, 18 in the stationary state, but are preferably separated from each other. This prevents the deformation of the pair of rubber legs 18 and 18 from being restricted by the locking protrusions 44 and 44 when normal vibration is input, and makes it easy to realize soft spring characteristics.

On the inner peripheral surface of the tubular portion 38, a plurality of recesses 52 that open toward the inner circumference are provided at positions in the circumferential direction corresponding to the tip portions of the branch upper portion 22 and the branch lower portion 24 of the pair of rubber legs 18 and 18. Has been done. By inserting the tip portions of the branch upper portion 22 and the branch lower portion 24 of the rubber legs 18 into the recess 52, the tip portions of the branch upper portion 22 and the branch lower portion 24 are restricted from moving in the circumferential direction with respect to the tubular portion 38. ..

The four caulking protrusions 46, 46, 46, 46 of the tubular portion 38 are formed on the branch upper portions 22, 22 and the branch lower portions 24, 24 of the pair of rubber legs 18, 18 of the main body rubber elastic body 16 inserted into the tubular portion 38. On the other hand, they are aligned in the circumferential direction. Each caulking protrusion 46 is located on an extension to the outer periphery of the branch upper portion 22, 22 and the branch lower portion 24, 24, respectively. Each caulking protrusion 46 is arranged on the outer peripheral side at a position corresponding to both ends of the pair of rubber legs 18 and 18 in the circumferential direction of the tubular portion 38. The two caulking protrusions 46, 46 on the upper side are located on the upper stopper rubber 30 side (upper side) in the circumferential direction from the extension line of the center line in the width direction of the branch upper portions 22, 22 shown by the alternate long and short dash line in FIG. There is. The two lower caulking protrusions 46, 46 are on the lower stopper rubber 32 side (lower side) in the circumferential direction than on the extension line of the center line in the width direction of the branch lower portions 24, 24, which are also shown by the alternate long and short dash line in FIG. positioned. Each caulking protrusion 46 is provided at a position off from the center in the vertical direction of the tubular portion 38 in which the lower stopper rubber 32 is arranged and the center in the horizontal direction of the tubular portion 38 in which the upper stopper rubber 30 is arranged. ..

The upper and lower stopper rubbers 30 and 32 of the main body rubber elastic body 16 are separated and opposed to the inner peripheral surface of the tubular portion 38 with a predetermined gap (stopper clearance). The distance between the upper and lower stopper rubbers 30 and 32 and the inner peripheral surface of the tubular portion 38 is set to an appropriate stopper clearance when the shared support load of the power unit is input in the state of being mounted on the vehicle described later. It is set to be.

A plate 36 is attached to the outer main body 34 to which the main body rubber elastic body 16 is attached. The plate 36 is a highly rigid member made of metal or the like, and has a substantially annular plate shape as shown in FIG. The plate 36 is provided with caulking holes 54 penetrating in the thickness direction at four locations in the circumferential direction. The caulking hole 54 is a circular hole through which the caulking projection 46 can be inserted, and is arranged at a position corresponding to the caulking projection 46. The plate 36 is integrally formed with retaining protrusions 56, 56 protruding inward on both sides in the left-right direction, and the inner diameter of the left and right sides on which the retaining protrusions 56, 56 are formed is the retaining protrusion. It is smaller than the inner diameter of the upper and lower side portions that deviate from 56 and 56 in the circumferential direction. In short, the opening of the plate 36 is narrower in the left-right direction than in the up-down direction. In the present embodiment, the inner diameter of the plate 36 is smaller than the inner diameter of the front end opening of the cylinder 38 in the left-right direction, and is larger than the inner diameter of the front end opening of the cylinder 38 in the vertical direction. .. The plate 36 has a substantially constant thickness dimension as a whole, and the front surface and the rear surface each have a plane substantially orthogonal to the front-rear direction.

The plate 36 is overlapped with the other end surface (front end surface) of the tubular portion 38 in the outer body 34 in the axial direction. By inserting the caulking protrusion 46 of the tubular portion 38 into the caulking hole 54 of the plate 36, the tubular portion 38 and the plate 36 are mutually positioned in the circumferential direction. Then, the tip portion of the caulking protrusion 46 inserted through the caulking hole 54 is crushed in the projecting direction and deformed to expand the diameter. As a result, the tip portion of the caulking projection 46 has a larger diameter than the caulking hole 54, the caulking projection 46 is prevented from coming off from the caulking hole 54, and the tip portion of the caulking projection 46 is at the opening peripheral portion of the caulking hole 54. The plate 36 is caulked and fixed to the plate 36, and the plate 36 is fixed to the outer body 34.

The caulking projections 46 are caulked and fixed to the peripheral edge of the opening of the caulking hole 54. positioned. More specifically, the caulking fixing portion 58 is arranged on the extension of the branch upper portions 22 and 22 to the outer circumference and on the extension of the branch lower portions 24 and 24 to the outer circumference, respectively. The caulking fixing portion 58 is arranged on the outer peripheral side corresponding to both end portions of the rubber legs 18 in the circumferential direction of the tubular portion 38. The upper two caulking fixing portions 58, 58 are located on the upper stopper rubber 30 side of the extension line of the center line in the width direction of the branch upper portion 22 in the circumferential direction of the tubular portion 38, and are located on the upper stopper rubber 30 side, and the width of the branch upper portion 22. It is biased above the center line of the direction. The two lower caulking fixing portions 58, 58 are located on the lower stopper rubber 32 side of the extension line of the center line in the width direction of the branch lower portion 24 in the circumferential direction of the tubular portion 38, and are located on the lower stopper rubber 32 side. It is biased below the center line in the width direction. The caulking fixing portion 58 is located at a position where the central portion in the vertical direction of the tubular portion 38 in which the lower stopper rubber 32 is arranged and the central portion in the horizontal direction of the tubular portion 38 in which the upper stopper rubber 30 is arranged are separated in the circumferential direction. The upper and lower stopper rubbers 30 and 32 are not arranged on the extension to the outer periphery.

By fixing the plate 36 to the front surface of the tubular portion 38 accommodating the main body rubber elastic body 16, the opening on the front side of the tubular portion 38 is partially covered by the retaining protrusions 56 and 56 of the plate 36. The retaining protrusions 56 and 56 are provided on both left and right sides where the pair of rubber legs 18 and 18 are located, and the tip portions (outer peripheral end portions) of the pair of rubber legs 18 and 18 are provided on the retaining protrusions 56 and 56. They are superimposed in the axial projection. As a result, in the tip portions of the pair of rubber legs 18, 18, the amount of movement to the front side with respect to the tubular portion 38 is limited by the contact with the retaining protrusions 56, 56, and the main body rubber elastic body 16 with respect to the tubular portion 38. The rubber is prevented from coming off to the front side. The tip portions of the pair of rubber legs 18 and 18 are located between the facing surfaces of the locking protrusions 44 and 44 and the retaining protrusions 56 and 56, and the locking protrusions 44 with respect to the tubular portion 38 in the axial direction. , 44 and the facing surfaces of the retaining protrusions 56, 56 are positioned to prevent the cylinder portion 38 from coming off on both the front and rear sides. The retaining protrusions 56 and 56 may be in axial contact with the tips of the pair of rubber legs 18 and 18 in a stationary state, but are preferably separated and overlapped with a gap. There is. This prevents the deformation of the pair of rubber legs 18, 18 from being restricted by the retaining protrusions 56, 56 when normal vibration is input, and makes it easier to realize soft spring characteristics.

The locking protrusions 44 and 44 of the tubular portion 38 are not provided on the extension of the upper and lower stopper rubbers 30 and 32 in the axial direction (front-rear direction). The retaining protrusions 56 and 56 of the plate 36 are not provided in the portions where the upper and lower stopper rubbers 30 and 32 are arranged in the circumferential direction, and the plate 36 protrudes inward from the tubular portion 38 in the portions. do not have. That is, in the portion where the upper and lower stopper rubbers 30 and 32 are arranged in the circumferential direction, the inner diameter of the plate 36 is equal to or larger than the inner diameter of the cylinder portion 38, and in the present embodiment, the inner diameter of the plate 36 is the inner diameter of the cylinder portion 38. The plate 36 is located on the outer periphery of the inner peripheral surface of the tubular portion 38. As a result, the openings of the tubular portion 38 are opened on both the front and rear sides of the upper and lower stopper rubbers 30 and 32 without being covered by the plate 36. The upper and lower stopper rubbers 30 and 32 are allowed to bulge and deform in the front-rear direction without being restricted.

In the mounted state of the plate 36, the cushioning rubber 60 is attached to the attachment portion 40 of the outer body 34. As shown in FIGS. 1 and 4, the cushioning rubber 60 has a plate shape long in the left-right direction, and is overlapped with an adjacent portion 48 which is an upper portion of the mounting portion 40. The cushioning rubber 60 includes substantially cylindrical pin-shaped mounting portions 62 and 62 protruding from the overlapping surface to the adjacent portion 48 at two locations separated from each other in the left-right direction. The pin-shaped mounting portion 62 has, for example, a cylindrical shape having a diameter smaller than that of the cushion rubber mounting hole 50 of the outer body 34 as a whole, and a partially large diameter portion having a diameter larger than that of the cushion rubber mounting hole 50. It is equipped with. Then, the pin-shaped mounting portions 62, 62 are inserted into the buffer rubber mounting holes 50, 50, and the large diameter portion is fitted to the inner surface of the buffer rubber mounting holes 50, 50, so that the buffer rubber 60 is attached to the outer body 34. It is attached to. A part of the upper end portion of the cushioning rubber 60 attached to the outer main body 34 is located on the tubular portion 38, and is overlapped with the front surface of the plate 36 fixed to the front end surface of the tubular portion 38. The cushioning rubber 60 is overlapped with the adjacent portion 48 of the outer main body 34 and the lower end portion of the plate 36.

As shown in FIGS. 5 to 7, the inner bracket 64 is attached to the inner member 12. The inner bracket 64 is a highly rigid member made of a metal such as iron, and has a fitting shaft portion 66 fitted into the bracket mounting hole 28 of the inner member 12, and a fastening portion 68 fixed to a power unit (not shown). And are provided integrally. The fitting shaft portion 66 has a substantially cylindrical shape, and is fitted and fixed to an inner hole (bracket mounting hole 28) of the inner member 12 covered with the fitting rubber 26. The fastening portion 68 includes, for example, a plurality of bolt holes 69, and is fixed to the power unit by bolts (not shown) inserted through the bolt holes 69. The specific structure of the fastening portion 68 may be appropriately changed depending on the structure on the power unit side and the like.

As shown in FIGS. 6 and 7, the fastening portion 68 of the inner bracket 64 includes a stopper portion 70 projecting downward. The stopper portion 70 has a plate shape that extends substantially orthogonal to the front-rear direction. The stopper portion 70 is arranged so as to be separated forward from the adjacent portion 48 of the outer main body 34 of the outer member 14 and the lower end portion of the plate 36 so as to face each other. A cushioning rubber 60 is arranged between the stopper portion 70 and the facing surfaces of the adjacent portion 48 and the lower end portion of the plate 36. The stopper portion 70 and the cushioning rubber 60 are separated from each other, and an appropriate stopper clearance is set between the stopper portion 70 and the cushioning rubber 60. Further, on the front surface of the outer member 14, the portion facing the stopper portion 70 of the inner bracket 64 in the front-rear direction is the stopper contact surface 72, and the stopper contact surface 72 is the adjacent portion 48 of the outer body 34 and the plate 36. It is provided across the area. The stopper contact surface 72 is located between the lower caulking fixing portions 58 and 58 in the circumferential direction, and the portion of the plate 36 constituting the stopper contact surface 72 is the lower caulking holes 54 and 54. It is located between the circumferential directions. The stopper contact surface 72 deviates from the formed portion of the lower caulking holes 54, 54 in the plate 36 in the circumferential direction.

The anti-vibration mount 10 having such a structure has a pair of rubber legs 18 and 18 of the main body rubber elastic body 16 when vibration is input between the inner member 12 and the outer member 14 in the mounted state on the vehicle. Is elastically deformed, and the anti-vibration effect based on the internal friction of the rubber elastic body 16 of the main body is exhibited.

When the pair of rubber legs 18 and 18 are compressionally deformed in the substantially radial direction between the inner member 12 and the outer member 14 by the vibration input, they are accompanied by bulging deformation in the axial direction. In the present embodiment, the pair of rubber legs 18, 18 and the locking protrusions 44, 44 and the retaining protrusions 56, 56 are separated from each other in the axial direction, and a pair of rubber legs 18 and 18 are separated from each other in the axial direction when a normal vibration-proof target vibration is input. Axial bulging deformation of the rubber legs 18 and 18 is not constrained, and radial compression deformation of the pair of rubber legs 18 and 18 is allowed with a low dynamic spring constant. Therefore, it is possible to realize vibration isolation performance due to the low dynamic spring characteristic with respect to the normal vibration input in the vertical direction and the horizontal direction.

Further, when a vibration having a large amplitude is input in the vertical direction, the inner member 12 and the tubular portion 38 of the outer member 14 indirectly come into contact with each other via the upper stopper rubber 30 and the lower stopper rubber 32, and the inner member 12 And the relative displacement amount of the outer member 14 is limited. As a result, damage due to excessive deformation of the pair of rubber legs 18, 18 is avoided, and durability is improved. In this way, the abutment between the inner member 12 and the tubular portion 38 of the outer member 14 via the upper and lower stopper rubbers 30 and 32 limits the amount of relative displacement of the inner member 12 and the outer member 14 in the vertical direction. A stopper mechanism is configured.

When a large amplitude vibration in the vertical direction is input, the pair of rubber legs 18 and 18 are greatly compressed in the protruding direction by the branch upper portion 22 and 22 or the branch lower portion 24 and 24 according to the vibration input direction. Then, the compression-deformed branch upper portion 22, 22 or the branch lower portion 24, 24 is greatly bulged and deformed in the axial direction, and the axial end faces of the branch upper portion 22, 22 or the branch lower portion 24, 24 are locked by the locking protrusions 44, 44. And, they are pressed against the retaining protrusions 56 and 56, and a force that separates them from each other in the front-rear direction acts between the cylinder 38 and the plate 36. Separation of the plate 36 from the tubular portion 38 due to the force acting on the retaining protrusions 56 and 56 of the plate 36 is prevented by the fixing force by the caulking fixing portion 58. Here, the caulking fixing portion 58 is close to the position corresponding to the maximum input position to the plate 36 due to the contact between the branch upper portion 22, 22 or the branch lower portion 24, 24 and the retaining protrusion 56, 56, that is, the maximum input position. It is arranged in a position. Therefore, the moment applied to the caulking fixing portion 58 due to the contact between the branch upper portion 22, 22 or the branch lower portion 24, 24 and the retaining protrusion 56, 56 is reduced, and the caulking fixing portion 58 is less likely to be deformed (damaged). The durability of the caulking fixing portion 58 is improved, and the plate 36 is prevented from being separated from the tubular portion 38.

By the way, the maximum input position to the plate 36 when the inner member 12 is displaced upward relative to the outer member 14 and the branch upper portion 22 is compressed is above the extension of the center line in the width direction of the branch upper portion 22. It becomes. Therefore, the upper caulking fixing portion 58 located on the extension of the branch upper portion 22 is arranged so as to be biased upward with respect to the extension of the center line in the width direction of the branch upper portion 22. It is arranged closer to the part where the input is particularly large during compression. As a result, the moment acting on the upper caulking fixing portion 58 is further reduced, and the durability of the caulking fixing portion 58 is improved, so that the plate 36 can be prevented from being separated from the tubular portion 38.

Further, when the inner member 12 is displaced downward with respect to the outer member 14 and the branch lower portion 24 is compressed, the maximum input position to the plate 36 is from the extension of the center line in the width direction of the branch lower portion 24. Is also on the lower side. Therefore, the lower caulking fixing portion 58 located on the extension of the branch lower portion 24 is arranged so as to be biased downward with respect to the extension of the center line in the width direction of the branch lower portion 24, and the branch lower portion by vertical input. The 24 is arranged closer to the portion where the input is particularly large during compression. As a result, the moment acting on the lower caulking fixing portion 58 is further reduced, and the durability of the caulking fixing portion 58 is improved, so that the plate 36 can be prevented from being separated from the tubular portion 38.

The position corresponding to the maximum input position to the plate 36 where the caulking fixing portion 58 is arranged does not have to exactly match the maximum input position to the plate 36.

When a large amplitude vibration in the front-rear direction is input, the elastic body 16 of the main body may move forward with respect to the outer member 14, and the upper branches 22, 22 and the lower branches 24, 24 may come into contact with the retaining protrusions 56, 56. .. In this case as well, a forward force that pulls away from the tubular portion 38 acts on the plate 36, but it is close to the input position due to the contact between the branch upper portions 22, 22 and the branch lower portions 24, 24 and the retaining protrusions 56, 56. The caulking fixing portion 58 arranged so as to prevent the plate 36 from falling off from the tubular portion 38.

When the inner member 12 largely moves backward with respect to the outer member 14 due to the input of large amplitude vibration in the front-rear direction, the stopper portion 70 of the inner bracket 64 becomes the stopper contact surface 72 of the outer member 14 covered with the cushioning rubber 60. Indirectly abut against it. As a result, the amount of rearward displacement of the inner member 12 with respect to the outer member 14 is limited, the rubber elastic body 16 of the main body 16 is prevented from coming out rearward from the tubular portion 38, and the pair of rubber legs 18 and 18 are prevented. Durability is improved by preventing excessive deformation of the rubber. In this way, the amount of rearward displacement of the inner member 12 with respect to the outer member 14 is limited by the contact between the stopper portion 70 of the inner bracket 64 and the stopper contact surface 72 of the outer member 14 via the cushioning rubber 60. An axial stopper mechanism is configured.

The cushioning rubber 60 is overlapped over the plate 36 and the adjacent portion 48 of the outer body 34, and the stopper contact surface 72 constituting the axial stopper mechanism is the front surface of the plate 36 and the adjacent portion 48 of the outer body 34. It is provided straddling the front of the. As a result, a wide area of the stopper contact surface 72 can be secured in the structure in which the plate 36 is superposed on the front end surface of the tubular portion 38 of the outer body 34 and caulked and fixed.

In the outer main body 34, the front surface of the adjacent portion 48 is positioned so as to project forward from the front surface of the tubular portion 38. The front surface of the adjacent portion 48 is located forward by the thickness of the plate 36 with respect to the front surface of the tubular portion 38, and the front surface of the plate 36 overlapped with the front surface of the tubular portion 38 is the front surface of the adjacent portion 48. It is located on almost the same plane. By obtaining the flat stopper contact surface 72 straddling the front surface of the plate 36 and the front surface of the adjacent portion 48, it is possible to prevent the stopper portion 70 from being unevenly contacted with any of the plate 36 and the adjacent portion 48. It is possible to secure a large effective pressure receiving area on the stopper contact surface 72. The front surface of the adjacent portion 48 constituting the stopper contact surface 72 and the front surface of the plate 36 may be slightly displaced in the front-rear direction due to dimensional tolerances of parts, assembly errors, etc., but such a minute position. The deviation is not substantially a problem because the stopper portion 70 and the stopper contact surface 72 are in contact with each other via the cushioning rubber 60.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific description thereof. For example, the rubber leg 18 is not necessarily limited to a bifurcated shape including a branch upper portion 22 and a branch lower portion 24, and may have a one-character shape protruding from the inner member 12 on both the left and right sides. Further, the pair of rubber legs 18 and 18 may have a C-shape that tilts downward as it goes outward in the left-right direction, for example.

The arrangement of the caulking fixing portion 58 can be appropriately changed so as to correspond to the maximum input position to the plate 36 according to the expected input direction of vibration and the like. For example, when a large amplitude vibration in the left-right direction is input to the anti-vibration mount 10, the position of the caulking fixing portion 58 is on the concave groove 20 side in the extension of the branch upper portion 22 and the branch lower portion 24 to the outer periphery. It can be set close to the circumferential end. Further, when a larger fixing strength is required, the caulking fixing portion 58 can be provided not only at the position corresponding to the maximum input position to the plate 36 but also at the portion outside the position.

The main body rubber elastic body 16 may include another rubber leg in addition to the pair of rubber legs 18, 18. Specifically, for example, the main body rubber elastic body may include, in addition to the pair of left and right rubber legs 18, 18, rubber legs extending vertically from the inner member 12 to at least one of the upper and lower sides.

As shown in the above embodiment, the retaining protrusion 56 is preferably provided partially in the circumferential direction at the portion corresponding to the outer peripheral end portions of the rubber legs 18 and 18, but is provided over the entire circumference. May be good. Like the retaining protrusion 56, the locking protrusion 44 may be partially provided in the circumferential direction, or may be provided over the entire circumference.

In the above embodiment, the inner member 12 is a tubular member fixed to the inner peripheral portion of the main body rubber elastic body 16 in a substantially embedded state. For example, a member corresponding to the inner bracket 64 of the embodiment is used. It can also be an inner member. The inner member 12 does not have to be fixed to the rubber elastic body 16 of the main body, and may be attached without adhesion.

In the above embodiment, the vibration-proof mount 10 that supports vibration-proofing of a power unit such as an engine mount or a motor mount is exemplified, but the present invention is also applied to a vibration-proofing device that supports vibration-proofing other than a power unit such as a differential mount. can do.

10 Anti-vibration mount (anti-vibration device)
12 Inner member 14 Outer member 16 Main body rubber elastic body 18 Rubber leg 20 Concave groove 22 Branch upper part 24 Branch lower part 26 Fitting rubber 28 Bracket mounting hole 30 Upper stopper rubber (stopper rubber)
32 Lower stopper rubber (stopper rubber)
34 Outer body 36 Plate 38 Cylindrical part 40 Mounting part 42 Body rubber mounting hole 44 Locking protrusion 46 Caulking protrusion 48 Adjacent part 50 Buffer rubber mounting hole 52 Recessed portion 54 Caulking hole 56 Retracting protrusion 58 Caulking fixing part 60 Buffer rubber 62 Pin Mounting part 64 Inner bracket 66 Fitting shaft part 68 Fastening part 69 Bolt hole 70 Stopper part 72 Stopper contact surface

Claims (9)

An anti-vibration device in which an inner member is arranged in a tubular portion of an outer member, and the inner member and the outer member are connected by a rubber elastic body of a main body which is fitted into the tubular portion without adhesion.
The main body rubber elastic body is provided with a pair of rubber legs extending in a direction opposite to the inner member and the tubular portion on both sides of the inner member.
At one end of the tubular portion in the axial direction, a locking protrusion that protrudes toward the inner circumference of the tubular portion and is vertically overlapped with the outer peripheral ends of the pair of rubber legs is provided. ,
A caulking protrusion projecting to the other end face of the tubular portion in the axial direction is inserted into a caulking hole of an annular plate superimposed on the other end surface of the tubular portion in the axial direction and caulked and fixed to the plate.
The plate fixed to the tubular portion is axially superposed on the outer peripheral end portion of the pair of rubber legs, and the outer peripheral end portion of the pair of rubber legs is between the locking protrusion and the plate. Positioned in the axial direction,
A vibration isolator in which the caulking protrusion and the caulking fixing portion by the caulking hole are arranged at positions corresponding to the maximum input position with respect to the plate by pressing the outer peripheral end portion of the pair of rubber legs. The vibration isolator according to claim 1, wherein the caulking fixing portion is arranged on an extension of the pair of rubber legs to the outer peripheral side. The anti-vibration device according to claim 2, wherein the caulking fixing portions are provided at both end portions of the rubber legs in the circumferential direction in the circumferential direction of the tubular portion. The vibration isolator according to claim 3, wherein each rubber leg is provided with a concave groove that opens in the outer peripheral surface of the central portion of the rubber leg in the circumferential direction of the tubular portion and penetrates the rubber leg in the axial direction. .. A claim that a stopper rubber is provided between the pair of rubber legs in the circumferential direction of the tubular portion, and the caulking fixing portion is arranged so as to be offset from the extension of the stopper rubber in the circumferential direction of the tubular portion. The anti-vibration device according to any one of 1 to 4. The anti-vibration device according to claim 5, wherein the plate does not protrude inward from the tubular portion at a position where the stopper rubber is arranged. An anti-vibration device in which an inner member is arranged in a tubular portion of an outer member, and the inner member and the outer member are connected by a rubber elastic body of a main body which is fitted into the tubular portion without adhesion.
At one end of the tubular portion in the axial direction, a locking protrusion that projects toward the inner circumference of the tubular portion and is vertically overlapped with the outer peripheral end of the rubber elastic body of the main body is provided. ,
A caulking protrusion projecting to the other end face of the tubular portion in the axial direction is inserted into a caulking hole of the plate overlapped with the other end surface of the tubular portion in the axial direction and caulked and fixed to the plate.
The plate fixed to the tubular portion is axially superposed on the outer peripheral end portion of the main body rubber elastic body, and the outer peripheral end portion of the main body rubber elastic body is between the locking protrusion and the plate. Positioned in the axial direction,
The adjacent portion of the outer member adjacent to the tubular portion protrudes from the tubular portion to the other in the axial direction by the thickness of the plate, and the surface of the plate superimposed on the other end surface in the axial direction of the tubular portion is adjacent to the tubular portion. It is located on the same plane as the surface of the part,
A vibration isolator in which a stopper contact surface on the outer member side, which constitutes an axial stopper mechanism by contact with the inner member side, straddles the surfaces of both the adjacent portion and the plate. The anti-vibration device according to claim 7, wherein a cushioning rubber is superposed on the stopper contact surface, and the cushioning rubber is provided so as to straddle the surfaces of both the adjacent portion and the plate. The vibration isolator according to claim 7 or 8, wherein the stopper contact surface is provided at a position outside the caulking hole in the circumferential direction of the plate.

Images