CN114623191B

CN114623191B - Vibration isolator

Info

Publication number: CN114623191B
Application number: CN202111274461.4A
Authority: CN
Inventors: 石川亮太; 畑中桂史; 藤田香澄; 川井基宽; 吉田正树
Original assignee: Sumitomo Riko Co Ltd; Toyota Motor Corp
Current assignee: Sumitomo Riko Co Ltd; Toyota Motor Corp
Priority date: 2020-12-11
Filing date: 2021-10-29
Publication date: 2023-05-16
Anticipated expiration: 2041-10-29
Also published as: CN114623191A; JP2022093170A; JP7460512B2

Abstract

The invention provides a vibration isolator with a novel structure, which can simply set an anti-falling structure for preventing a main rubber elastomer from falling off while having enough durability. A vibration isolator (10) is formed by connecting an inner member (12) and an outer member (14) to each other through a main rubber elastic body (16) fitted into a cylindrical portion (38) of the outer member in a non-adhesive manner, wherein the main rubber elastic body has a pair of rubber legs (18) located on both sides of the inner member. A caulking protrusion (46) protruding from an axial end face of the cylindrical portion penetrates through and is caulking-fixed with a caulking hole (54) of the annular plate (36), the plate fixed to the axial end face of the cylindrical portion overlaps with outer peripheral end portions of the pair of rubber legs in the axial direction, and the outer peripheral end portions of the pair of rubber legs are positioned by the plate in the axial direction. The caulking fixing section (58) based on the caulking protrusion is arranged at a position corresponding to the maximum input position of the plate output by the pressing of the pair of rubber legs.

Description

Vibration isolator

Technical Field

The present invention relates to a vibration isolator used as an engine mount, a motor mount, a differential mount, or the like of a motor vehicle, for example.

Background

Conventionally, as disclosed in japanese patent application laid-open No. 2015-001271 (patent document 1), vibration isolation devices having a structure in which an inner member and an outer member are connected by a main rubber elastic body are known, and are used for example as various brackets for automobiles.

However, in patent document 1, the main rubber elastic body is fitted into the tubular portion of the outer member in a non-fixed manner, and the press-fitting metal member having the release preventing projection for preventing the release of the main rubber elastic body is press-fitted into the tubular portion of the outer member.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2015-001271

Disclosure of Invention

Problems to be solved by the invention

However, since the press-fit metal material is press-fitted into the tubular portion of the outer member substantially uniformly over the entire circumference, the fixing strength with respect to the outer member becomes substantially the same at a portion of the press-fit metal material on which a large load is applied due to deformation of the main rubber elastic body and at a portion of the press-fit metal material on which an input load is relatively small due to deformation of the main rubber elastic body. Therefore, it is clear that if the fixing strength is set so as to be capable of exerting a load-resistant performance (durability) sufficient to prevent the press-fit metal piece from coming off the outer member at the input portion of a large load, an excessive fixing force acts at the portion where the input load is small, and a new problem is that a large force is required in the press-fit fixing operation of the press-fit metal piece to the outer member.

The invention provides a vibration isolator with a new structure, which can simply set an anti-falling structure for preventing a main rubber elastomer from falling off while having enough durability.

Means for solving the problems

The preferred embodiments for grasping the present invention are described below, but the embodiments described below are exemplary embodiments described below, and not only can be used by being appropriately combined with each other, but also can be used by being recognized and used as independently as possible for a plurality of components described in each embodiment, and can be used by being appropriately combined with any of the components described in other embodiments. Thus, the present invention is not limited to the following embodiments, and various other embodiments can be realized.

The first aspect is a vibration isolator in which an inner member is disposed in a cylindrical portion of an outer member, the inner member and the outer member are connected by a main rubber elastic body fitted into the cylindrical portion in a non-adhesive manner, wherein the main rubber elastic body includes a pair of rubber legs extending in opposite directions in which the inner member and the cylindrical portion face each other on both sides of the inner member, a locking projection projecting toward an inner periphery of the cylindrical portion and overlapping an outer peripheral end of the pair of rubber legs in an axial direction is provided at one end of the cylindrical portion, and a caulking projection projecting from the other end face in the axial direction of the cylindrical portion penetrates a caulking hole of an annular plate overlapping the other end face in the axial direction of the cylindrical portion and is caulking-fixed to the plate, the outer peripheral end of the pair of rubber legs fixed to the cylindrical portion is positioned in an axial direction between the locking projection and the plate, and a caulking fixing portion based on the caulking projection and the caulking hole is disposed at a position corresponding to an outermost position of the pair of rubber legs and the outer peripheral end of the input plate based on the pressing position.

According to the vibration isolator having the structure according to the present embodiment, the plate overlapped on the axial end surface of the cylinder can be used to prevent the main rubber elastic body from falling off the cylinder. By caulking and fixing the caulking projections of the cylindrical portion penetrating the caulking holes of the plate to the plate, the plate can be easily fixed to the cylindrical portion with a small force.

The arrangement of the caulking portion after fixing the tube portion and the plate by caulking is set to the pair of rubber legs of the main body rubber elastic body, and the caulking portion is arranged at a position corresponding to a maximum input position where a force applied to the plate by pressing of the pair of rubber legs is maximum. In this way, the fixing strength between the tube portion and the plate by the caulking fixing portion is exerted to be large at the position where the input of the plate is large. Therefore, the tubular portion and the plate can be efficiently fixed by the small number of caulking fixing portions, and the tubular portion and the plate can be easily manufactured while reducing the force required for caulking fixing, and excellent durability due to high fixing strength of the tubular portion and the plate can be realized, preventing the plate from falling off from the tubular portion, and the like.

A second aspect is the vibration isolator according to the first aspect, wherein the caulking fixing portion is disposed on an extension line extending toward an outer peripheral side of the pair of rubber legs.

According to the vibration damping device having the structure according to the present embodiment, the caulking portion is disposed on the extension line extending toward the outer peripheral side of the pair of rubber legs, so that the caulking portion can be easily disposed at a position corresponding to a position where the input of the pair of plates is maximum by the pressing of the pair of rubber legs.

A third aspect is the vibration damping device according to the second aspect, wherein the caulking fixing sections are provided at both end portions in the circumferential direction of the tubular section, respectively.

According to the vibration damping device configured in accordance with the present embodiment, by providing the caulking fixing portions on the extension lines of the circumferential end portions of the rubber legs, for example, when vibration in the radial direction orthogonal to the opposing directions of the pair of rubber legs is input between the inner member and the outer member, the force applied to the plate by the rubber legs deformed by compression is maximized at the outer side than the center in the circumferential direction of the rubber legs when the end portions of the rubber legs on the compression side apply the force toward the outer side in the axial direction to the plate. Therefore, by providing the caulking portions at both end portions of the rubber leg in the circumferential direction of the cylindrical portion, it is possible to realize the arrangement of the caulking portions corresponding to the position where the force applied from the rubber leg deformed by the input to the plate is maximum.

A fourth aspect is the vibration isolator according to the third aspect, wherein each of the rubber legs includes a groove that is open at an outer peripheral surface of a central portion of the rubber leg in a circumferential direction of the tube portion and penetrates the rubber leg in an axial direction.

According to the vibration damping device having the structure according to the present embodiment, the caulking fixing portions can be disposed at the input positions of the plate from the respective portions of the rubber leg divided in the circumferential direction by the groove, respectively, and the fixing strength of the plate to the cylinder portion can be ensured at the input positions.

A fifth aspect is the vibration damping device according to any one of the first to fourth aspects, wherein a stopper rubber is provided between the pair of rubber legs in the circumferential direction of the tube portion, and the caulking fixing portion is arranged so as to deviate from an extension line of the stopper rubber in the circumferential direction of the tube portion.

According to the vibration isolator having the structure according to the present embodiment, the abutment of the inner member and the outer member with the stopper rubber interposed therebetween forms the axial direction stopper mechanism for restricting the relative displacement amount of the inner member and the outer member in the direction perpendicular to the axis, and the durability is improved by preventing excessive deformation of the rubber leg.

The stopper rubber is provided at a position between the circumferential directions of the pair of rubber legs and separated from a position where the input from the pair of rubber legs to the plate is maximum. Therefore, by disposing the caulking portions so as to deviate from the extension line of the stopper rubber toward the outer periphery, the caulking portions are unnecessarily provided in excess and efficiently disposed, and excellent durability can be obtained while easily performing the fixing operation of the tube portion and the plate.

A sixth aspect is the vibration damping device according to the fifth aspect, wherein the plate does not protrude inward from the cylindrical portion at a position where the stopper rubber is disposed.

According to the vibration damping device having the structure according to the present embodiment, even if the stopper rubber is bulged in the axial direction of the cylindrical portion, the stopper rubber does not contact the plate, and thus a force is not applied from the stopper rubber to the plate outward in the axial direction. Therefore, even if no caulking fixing portion is provided at a position where the stopper rubber is provided, it is difficult to affect the fixing strength required for fixing the tube portion and the plate, so that a sufficient fixing strength can be efficiently obtained by a small number of caulking fixing portions.

However, in the vibration damping device according to the first to sixth aspects, when the anti-slip structure of the main rubber elastic body is provided by caulking the plate that is fixed in a state of overlapping the tubular portion of the outer member, a new problem arises in that the stopper contact surface on the outer member side is narrowed in the axial stopper that limits the relative displacement amount in the axial direction of the inner member and the outer member. That is, by overlapping the plate with the cylindrical portion of the outer member, if a difference in level occurs between the surface of the plate overlapping the cylindrical portion and the surface of the abutting portion of the outer member abutting the cylindrical portion, it is difficult to secure a flat stop abutment surface in a wide area.

In order to solve the above-described new problem, a seventh aspect is an anti-vibration device in which an inner member is disposed in a tube portion of an outer member, the inner member and the outer member are coupled by a main rubber elastic body fitted into the tube portion in a non-adhesive manner, wherein a locking projection projecting toward an inner periphery of the tube portion and axially overlapping an outer peripheral end portion of the main rubber elastic body is provided at one end portion in an axial direction of the tube portion, a caulking projection projecting from an axially other end face of the tube portion penetrates a caulking hole of a plate overlapping an axially other end face of the tube portion and is caulking-fixed to the plate, the plate fixed to the tube portion overlaps the outer peripheral end portion of the main rubber elastic body in an axial direction, the outer peripheral end portion of the main rubber elastic body is positioned in an axial direction between the locking projection and the plate, an abutting portion of the outer member adjacent to the tube portion projects in an axial direction by a thickness of the plate, and a stopper mechanism is provided between the abutting portion of the other end face of the tube portion and the abutting portion of the plate adjacent to the other end face of the tube portion and the abutting face of the plate on the other end face of the tube portion and the abutting face of the other face of the plate.

According to the vibration damping device formed in the structure according to the present embodiment, the surface of the abutting portion in the outer member protrudes further toward the other side in the axial direction than the surface of the cylindrical portion, and the surface of the plate overlapping the cylindrical portion is formed to be located on the same plane as the surface of the abutting portion. Therefore, in the structure in which the plate is overlapped with the axial end surface of the cylindrical portion and is caulking-fixed, the flat stopper contact surface can be ensured in a wide area by cooperation of the surface of the plate and the surface of the abutting portion.

An eighth aspect is the vibration damping device according to the seventh aspect, wherein a cushion rubber is provided so as to extend across both surfaces of the abutting portion and the plate, and the cushion rubber is superimposed on the stopper contact surface.

According to the vibration isolator having the structure according to the present embodiment, for example, in the case of a small height difference due to a dimensional tolerance or the like in manufacturing the surface of the plate and the surface of the adjacent portion, the buffer rubber is overlapped so as to cross the surface of the plate and the surface of the adjacent portion, whereby the stopper load can be prevented from being biased toward the plate or the adjacent portion by the height difference.

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

According to the vibration isolator having the structure according to the present embodiment, the concave-convex portions due to the caulking holes and the caulking projections can be prevented from being provided on the stopper contact surface, and a flat stopper contact surface can be obtained.

Effects of the invention

According to the present invention, the drop preventing structure for preventing the drop of the main body rubber elastic body can be simply provided while having sufficient durability.

Drawings

Fig. 1 is a front view showing a vibration isolation mount as a first embodiment of the present invention.

Fig. 2 is a sectional view of fig. 1 at II-II.

Fig. 3 is a cross-sectional view of fig. 2 at III-III.

Fig. 4 is an exploded perspective view of the vibration-proof bracket shown in fig. 1.

Fig. 5 is a perspective view showing the vibration isolation mount shown in fig. 1 in a state where the inner bracket is attached.

Fig. 6 is a front view of the vibration-proof bracket with the inner bracket shown in fig. 1.

Fig. 7 is a cross-sectional view VII-VII of fig. 6.

Description of the reference numerals

10: vibration-proof brackets (vibration-proof devices);

12: an inner member;

14: an outer member;

16: a main body rubber elastomer;

18: rubber legs;

20: a groove;

22: the upper part of the branch;

24: a branching lower part;

26: a chimeric rubber;

28: bracket assembly holes;

30: upper stopper rubber (stopper rubber);

32: lower stopper rubber (stopper rubber);

34: an outer body;

36: a plate;

38: a cylinder portion;

40: a mounting part;

42: a main body rubber fitting hole;

44: a locking protrusion;

46: riveting the protrusion;

48: an abutting portion;

50: a buffer rubber mounting hole;

52: a concave portion;

54: riveting holes;

56: an anti-disengagement protrusion;

58: a caulking fixing portion;

60: a buffer rubber;

62: a pin-shaped fitting portion;

64: an inner bracket;

66: a fitting shaft portion;

68: a fastening part;

69: bolt holes;

70: a stopper;

72: stop abutment surface.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

In fig. 1 to fig. 1, a vibration isolation mount 10 for a motor vehicle is shown as a first embodiment of a vibration isolation device provided in a structure according to the present invention. The vibration isolation mount 10 is applied to, for example, an engine mount, a motor mount, or the like of a motor vehicle, and vibration-isolated-couples a power unit including an engine, a motor, or the like to a vehicle body. The vibration isolation mount 10 has a structure in which an inner member 12 and an outer member 14 are elastically coupled by a main rubber elastic body 16. In the following description, in principle, the up-down direction refers to the up-down direction in fig. 1, the left-right direction refers to the left-right direction in fig. 1, and the front-back direction refers to the left-right direction in fig. 2. In principle, the circumferential direction refers to the circumferential direction of the tubular portions 38 (described later) of the inner member 12 and the outer member 14, and the axial direction refers to the front-rear direction of the axial direction of the tubular portions 38 as the inner member 12 and the outer member 14, respectively.

The inner member 12 is a high-rigidity member made of metal or the like, for example, and is formed in a substantially cylindrical shape extending straight in the front-rear direction as shown in fig. 2 and 3.

The inner member 12 is vulcanization bonded to the inner peripheral end portion of the main rubber elastic body 16. The main rubber elastic body 16 includes a pair of left and

right rubber legs

18, 18. The rubber leg 18 is provided so as to protrude outward in the left-right direction from the inner member 12, and the width dimension in the circumferential direction (width dimension in the up-down direction) gradually increases as going outward in the left-right direction. The rubber leg 18 has a groove 20 that opens on the outer peripheral surface and penetrates in the axial direction. The rubber leg 18 is formed in a shape branched into two by sandwiching the groove 20, the upper side portion is formed as a branched upper portion 22 inclined upward toward the outer periphery than the groove 20, and the lower side portion is formed as a branched lower portion 24 inclined downward toward the outer periphery than the groove 20. The groove 20 is provided at a central portion of the rubber leg 18 in the circumferential direction of the inner member 12, and the branch

upper portions

22, 22 and the branch

lower portions

24, 24 are formed in a substantially vertically symmetrical shape. The inner ends of the pair of

rubber legs

18, 18 in the lateral direction are fixedly connected to the inner member 12. The main rubber elastic body 16 includes a fitting rubber 26 covering the inner peripheral surface of the inner member 12, and the fitting rubber 26 is formed integrally with the pair of

rubber legs

18, 18. A bracket fitting hole 28 penetrating in the front-rear direction is formed in the inner periphery of the fitting rubber 26. The bracket fitting hole 28 may be regarded as an inner hole of the inner member 12 covered with the fitting rubber 26. In the present embodiment, the pair of

rubber legs

18, 18 are formed in a laterally symmetrical shape, but may be formed in different asymmetrical shapes.

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, 18 in the circumferential direction. The upper stopper rubber 30 is provided between the branched

upper portions

22, 22 of the pair of rubber legs 18, and protrudes upward from the inner member 12. The front end surface of the upper stopper rubber 30 is located at an inner periphery of the front end surface of the rubber leg 18, and the protruding height of the upper stopper rubber 30 from the inner member 12 is formed smaller than the maximum protruding height of the rubber leg 18, that is, the protruding height of the branch upper portion 22. The lower stopper rubber 32 is provided between the branched

lower portions

24, 24 of the pair of rubber legs 18, and protrudes downward from the inner member 12. The front end surface of the lower stopper rubber 32 is located at an inner periphery of the front end surface of the rubber leg 18, and the protruding height of the lower stopper rubber 32 from the inner member 12 is formed smaller than the maximum protruding height of the rubber leg 18, that is, the protruding height of the branch lower portion 24.

The main body rubber elastic body 16 of the present embodiment integrally includes a pair of

rubber legs

18, 18 protruding from both sides of the inner member 12 in the lateral direction, an upper stopper rubber 30 protruding upward from the inner member 12, and a lower stopper rubber 32 protruding downward from the inner member 12. The main rubber elastic body 16 is formed as an integrally vulcanization molded piece provided with the inner member 12.

The main rubber elastic body 16 is attached to the outer member 14 in a non-adhesive manner. The outer member 14 is formed as a high-rigidity member formed of metal, fiber-reinforced synthetic resin, or the like. The outer member 14 has a structure in which a plate 36 is attached to the outer body 34. The outer body 34 integrally includes a tube 38 to which the body rubber elastic body 16 is attached, and an attachment portion 40 extending downward from the tube 38.

The tubular portion 38 is formed in a substantially cylindrical shape extending in the front-rear direction, and includes a main rubber fitting hole 42 penetrating in the axial direction. The main body rubber fitting hole 42 is formed so that the diameter gradually increases from the rear end (right end in fig. 2) toward the front end (left end in fig. 2), and the inner peripheral surface is made to have a draft taper, whereby the mold forming of the tube portion 38 becomes easy. At one (rear) end portion in the axial direction of the tubular portion 38, locking

projections

44, 44 protruding toward the inner periphery are integrally formed. The locking protrusion 44 is provided locally in the circumferential direction. In the present embodiment, the locking

projections

44, 44 are provided on both sides in the left-right direction, and are partially blocked by the locking

projections

44, 44 so that the opening on the front side of the tube 38 becomes elliptical with the longitudinal axis in the up-down direction.

A caulking protrusion 46 protrudes from the other (front) end surface in the axial direction of the tubular portion 38. The caulking projections 46 are formed in a cylindrical shape having a small diameter, and are provided at four positions separated from each other in the circumferential direction. The caulking projections 46 are arranged at positions offset from the center in the up-down direction and the center in the left-right direction of the tubular portion 38.

The mounting portion 40 is formed in a thick, substantially plate-like shape, integrally formed with the tubular portion 38, and protrudes downward from the tubular portion 38. The width dimension of the mounting portion 40 in the left-right direction increases toward the lower side. The mounting portion 40 includes screw holes, not shown, opened in the lower surface at both end portions in the left-right direction, and is mounted to a vehicle body, not shown, or the like by a bolt, not shown, screwed into the screw holes. An upper end portion of the mounting portion 40 adjacent to the tube portion 38 is formed as an abutment portion 48. The front surface of the abutting portion 48 is formed as a plane extending orthogonally to the front-rear direction. The front surface of the abutting portion 48 is located forward of the front surface of the barrel portion 38, thereby forming a height difference with respect to the front surface of the barrel portion 38. In the abutting portion 48, cushion rubber mounting holes 50 of circular cross section that open at the front surface are provided at two positions that are separated from each other in the left-right direction (see fig. 4). The structure of the mounting portion 40 can be changed as appropriate, for example, according to the mounting structure to be mounted on the vehicle body. Specifically, for example, in the present embodiment, the mounting portion 40 is shown as being capable of being fixed to the vehicle body by a screw hole, but a fixing implant bolt for fixing to the vehicle body may be provided in the mounting portion.

As shown in fig. 2 and 3, the main body rubber elastic body 16 is mounted in the outer main body 34. The main body rubber elastic body 16 is inserted into the main body rubber fitting hole 42 of the tube 38 from the rear end opening of the tube 38, and is attached to the tube 38 in a non-adhesive manner. The front end surfaces of the branch upper portions 22 and the branch lower portions 24 of the pair of

rubber legs

18, 18 of the main body rubber elastic body 16 are pressed against the inner peripheral surface of the tube portion 38, respectively, so that the main body rubber elastic body 16 is elastically positioned within the main body rubber fitting hole 42, and the pair of

rubber legs

18, 18 are precompressed in the radial direction in the fitted state to the tube portion 38. The pair of

rubber legs

18, 18 of the main rubber elastic body 16 are disposed as distal end portions of outer peripheral end portions at positions overlapping with respect to the

engagement projections

44, 44 of the tubular portion 38 in the projection in the axial direction (front-rear direction), and the movement amount with respect to the insertion direction of the tubular portion 38 is regulated by abutment with the

engagement projections

44, 44. The locking

projections

44, 44 may be in contact with the distal end portions of the pair of

rubber legs

18, 18 in the axial direction in a rest state, and preferably separated therefrom. This prevents the deformation of the pair of

rubber legs

18, 18 from being restricted by the locking

projections

44, 44 during normal vibration input, and thus, soft elastic characteristics can be easily achieved.

A plurality of concave portions 52 opening toward the inner periphery are provided on the inner peripheral surface of the tubular portion 38 at positions in the circumferential direction corresponding to the distal end portions of the branch upper portions 22 and the branch lower portions 24 of the pair of

rubber legs

18, 18. By inserting the distal end portions of the branch upper portions 22 and the branch lower portions 24 of the rubber legs 18 into the recess 52, the distal end portions of the branch upper portions 22 and the branch lower portions 24 are restricted from moving circumferentially with respect to the tubular portion 38.

The four

caulking projections

46, 46 of the tubular portion 38 are respectively aligned in the circumferential direction with respect to 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 in the tubular portion 38. The caulking projections 46 are located on the extension lines of the branch

upper portions

22, 22 and the branch

lower portions

24, 24 toward the outer periphery, respectively. Each caulking protrusion 46 is disposed on the outer peripheral side at a position corresponding to both end portions of the pair of

rubber legs

18, 18 in the circumferential direction of the tube portion 38. The upper two

caulking projections

46, 46 are located on the side of the stopper rubber 30 (upper side) in the circumferential direction on the extension line of the center line in the width direction of the branch

upper portions

22, 22 indicated by the one-dot chain line in fig. 1. The two

caulking projections

46, 46 on the lower side are located on the side of the stopper rubber 32 (lower side) in the circumferential direction on the extension line of the center line in the width direction of the branch

lower portions

24, 24 indicated by the single-dot chain lines in the same manner as in fig. 1. Each caulking protrusion 46 is provided at a position offset from the center in the up-down direction of the cylindrical portion 38 where the lower stopper rubber 32 is disposed and the center in the left-right direction of the cylindrical portion 38 where the upper stopper rubber 30 is disposed.

The upper stopper rubber 30 and the lower stopper rubber 32 of the main body rubber elastic body 16 are separately opposed to each other with a predetermined gap (stopper gap) therebetween with respect to the inner peripheral surface of the tube portion 38. In a state of being assembled to the vehicle and in a state of receiving a shared supporting load of the power unit, which will be described later, the distance between the facing surfaces of the upper stopper rubber 30, the lower stopper rubber 32, and the inner peripheral surface of the tube 38 is set to form an appropriate stopper gap.

A plate 36 is attached to the outer body 34 to which the body rubber elastic body 16 is attached. The plate 36 is a high-rigidity member made of metal or the like, and is formed in a substantially circular plate shape as shown in fig. 4. The caulking holes 54 penetrating in the thickness direction of the plate 36 are provided at four positions in the circumferential direction. The caulking hole 54 is a circular hole formed so as to be penetrated by the caulking protrusion 46, and is disposed at a position corresponding to the caulking protrusion 46. The plate 36 has the

escape prevention protrusions

56, 56 integrally formed on both sides in the left-right direction so as to protrude toward the inner circumference, and the inner diameter dimensions of the left-right side portions formed with the

escape prevention protrusions

56, 56 are smaller than the inner diameter dimensions of the upper-lower side portions circumferentially offset from the

escape prevention protrusions

56, 56. In short, the width of the opening of the plate 36 in the left-right direction is narrower than the width in the up-down direction. In the present embodiment, the plate 36 is formed to have an inner diameter smaller than that of the front end opening of the tube 38 in the left-right direction and larger than that of the front end opening of the tube 38 in the up-down direction. The entirety of the plate 36 is formed to a substantially constant thickness dimension, and the front surface and the rear surface of the plate 36 are respectively formed to planes substantially orthogonal to the front-rear direction.

The plate 36 overlaps with the other end surface (front end surface) of the tubular portion 38 in the outer body 34 in the axial direction. By penetrating the caulking projections 46 of the cylindrical portion 38 through the caulking holes 54 of the plate 36, the cylindrical portion 38 and the plate 36 are positioned with each other in the circumferential direction. The distal end portion of the caulking projection 46 penetrating through the caulking hole 54 is crushed in the protruding direction, and is deformed in a diameter-expanding manner. Thereby, the distal end portion of the caulking protrusion 46 is formed to have a larger diameter than the caulking hole 54, so that the caulking protrusion 46 is prevented from falling out of the caulking hole 54, and the distal end portion of the caulking protrusion 46 is caulking-fixed to the plate 36 at the opening peripheral edge portion of the caulking hole 54, and the plate 36 is fixed to the outer body 34.

The caulking fixing portion 58 to which the caulking protrusion 46 is caulking-fixed to the opening peripheral edge portion of the caulking hole 54 is provided at four positions in the circumferential direction, and is located on the extension line of the pair of

rubber legs

18, 18 to the outer periphery, respectively. More specifically, the caulking fixing sections 58 are disposed on the extension lines of the branch

upper sections

22, 22 toward the outer periphery and on the extension lines of the branch

lower sections

24, 24 toward the outer periphery, respectively. The caulking fixing portions 58 are disposed on the outer peripheral sides corresponding to the both end portions of the rubber leg 18 in the circumferential direction of the tubular portion 38. The upper two

caulking fixing sections

58, 58 are located on the side of the stopper rubber 30 on the extension line of the center line of the branch upper section 22 in the width direction in the circumferential direction of the tubular section 38, and are located on the upper side of the center line of the branch upper section 22 in the width direction. The two

caulking fixing sections

58, 58 on the lower side are located on the lower stopper rubber 32 side on the extension line of the center line of the branch lower section 24 in the width direction in the circumferential direction of the tubular section 38, and are offset to the lower side from the center line of the branch lower section 24 in the width direction. The caulking fixing section 58 is provided at a position deviated in the circumferential direction from the center portion in the up-down direction of the tubular section 38 in which the lower stopper rubber 32 is disposed and the center portion in the left-right direction of the tubular section 38 in which the upper stopper rubber 30 is disposed, and is not disposed on an extension line of the upper stopper rubber 30 and the lower stopper rubber 32 to the outer periphery.

By fixing the plate 36 to the front surface of the tube 38 in which the main rubber elastic body 16 is housed, the opening of the front side of the tube 38 is partially covered by the

release preventing protrusions

56, 56 of the plate 36. The drop-preventing

protrusions

56, 56 are provided on both left and right side portions where the pair of

rubber legs

18, 18 are located, and tip end portions (outer peripheral end portions) of the pair of

rubber legs

18, 18 overlap the drop-preventing

protrusions

56, 56 in an axial projection. Accordingly, the movement amount of the distal end portions of the pair of

rubber legs

18, 18 forward of the tube 38 is restricted by the abutment of the release preventing protrusions 56, and the body rubber elastic body 16 is prevented from being released forward of the tube 38. The front end portions of the pair of

rubber legs

18, 18 are located between the facing surfaces of the locking

projections

44, 44 and the anti-drop projections 56, and are positioned axially with respect to the tubular portion 38 between the facing surfaces of the locking

projections

44, 44 and the anti-drop projections 56, so as to prevent drop-off from the tubular portion 38 on both the front and rear sides. The drop-preventing

protrusions

56, 56 may be in contact with the tip portions of the pair of

rubber legs

18, 18 in the axial direction in the rest state, but are preferably overlapped with a gap therebetween. This prevents the deformation of the pair of

rubber legs

18, 18 from being restricted by the

escape prevention protrusions

56, 56 during normal vibration input, and thus, soft elastic characteristics can be easily achieved.

The

engagement projections

44, 44 of the tubular portion 38 are not provided on the extension lines of the axial directions (front-rear directions) of the upper stopper rubber 30 and the lower stopper rubber 32. The

drop preventing protrusions

56, 56 of the plate 36 are not provided at portions where the upper stopper rubber 30 and the lower stopper rubber 32 are arranged in the circumferential direction, and the plate 36 does not protrude inward from the tubular portion 38 at the portions. That is, the plate 36 is formed so that the inner diameter of the plate 36 is equal to or larger than the inner diameter of the tube 38 at the portion where the upper stopper rubber 30 and the lower stopper rubber 32 are arranged in the circumferential direction, and in this embodiment, the plate 36 is located at a position closer to the outer periphery than the inner peripheral surface of the tube 38 than the inner diameter of the tube 38. By doing so, the openings of the cylindrical portion 38 are opened without being covered with the plate 36 on both front and rear sides of the upper stopper rubber 30 and the lower stopper rubber 32. Further, the bulge deformation of the upper stopper rubber 30 and the lower stopper rubber 32 in the front-rear direction is allowed without being restricted.

In the assembled state of the plate 36, the cushion rubber 60 is attached to the attachment portion 40 of the outer body 34. As shown in fig. 1 and 4, the cushion rubber 60 is formed in a plate shape elongated in the left-right direction and overlaps the abutting portion 48 which is the upper portion of the mounting portion 40. The cushion rubber 60 includes substantially cylindrical pin-shaped

fitting portions

62, 62 protruding from the overlapping surface overlapping the abutting portion 48 at two positions separated from each other in the left-right direction. The pin-shaped fitting portion 62 includes, for example, a cylindrical portion formed as a whole with a smaller diameter than the cushion rubber mounting hole 50 of the outer body 34 and a partial large diameter portion formed with a larger diameter than the cushion rubber mounting hole 50. The pin-shaped

fitting portions

62 and 62 are inserted into the cushion

rubber mounting holes

50 and 50, and the large diameter portions are fitted into the inner surfaces of the cushion

rubber mounting holes

50 and 50, whereby the cushion rubber 60 is mounted on the outer body 34. A portion of the upper end portion of the cushion rubber 60 attached to the outer body 34 is located on the tube portion 38 and overlaps the front surface of the plate 36 fixed to the front end surface of the tube portion 38. The cushion rubber 60 overlaps across the abutment 48 of the outer body 34 and the lower end portion of the plate 36.

As shown in fig. 5 to 7, the inner member 12 is equipped with an inner bracket 64. The inner bracket 64 is a high-rigidity member made of metal such as iron, and integrally includes a fitting shaft portion 66 fitted into the bracket fitting hole 28 of the inner member 12, and a fastening portion 68 fixed to a power unit, not shown. The fitting shaft portion 66 is formed in a substantially cylindrical shape, and is fitted and fixed to an inner hole (bracket fitting 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 a bolt, not shown, penetrating the bolt holes 69. The specific structure of the fastening portion 68 may be appropriately changed according to the structure of the power unit side or the like.

As shown in fig. 6 and 7, the fastening portion 68 of the inner bracket 64 includes a stopper portion 70 protruding downward. The stopper 70 is formed in a plate shape extending substantially perpendicularly to the front-rear direction. The stopper 70 is disposed so as to be spaced apart from and facing the abutment 48 of the outer body 34 and the lower end of the plate 36 in the outer member 14. A cushion rubber 60 is disposed between the facing surfaces between the stopper 70 and the abutment 48 and the lower end of the plate 36. The stopper 70 and the cushion rubber 60 are separated from each other, and an appropriate stopper gap is set between the stopper 70 and the cushion rubber 60. Further, a stopper abutment surface 72 is formed at a portion of the front surface of the outer member 14 that faces the stopper 70 of the inner bracket 64 in the front-rear direction, and the stopper abutment surface 72 is provided so as to span the abutment portion 48 of the outer body 34 and the plate 36. The stopper abutment surface 72 is located between the

rivet fixing portions

58, 58 on the lower side in the circumferential direction, and a portion of the plate 36 constituting the stopper abutment surface 72 is located between the rivet holes 54, 54 on the lower side in the circumferential direction. The stop abutment surface 72 is circumferentially offset from the formed portion of the lower staking holes 54, 54 in the plate 36.

In the vibration isolation mount 10 having the above-described structure, when vibration is input between the inner member 12 and the outer member 14 in the mounted state to the vehicle, the pair of

rubber legs

18, 18 of the main body rubber elastic body 16 are elastically deformed, and the vibration isolation effect due to internal friction or the like of the main body rubber elastic body 16 is exhibited.

The pair of

rubber legs

18, 18 undergo axial bulging deformation when undergoing compression deformation in a substantially radial direction between the inner member 12 and the outer member 14 due to vibration input. In the present embodiment, the pair of

rubber legs

18, 18 and the locking

projections

44, 44 and the

anti-drop projections

56, 56 are separated from each other in the axial direction, and the axial bulging deformation of the pair of

rubber legs

18, 18 is not restrained at the time of inputting the normal vibration to be vibration-proof, and the radial compression deformation of the pair of

rubber legs

18, 18 is allowed with a low dynamic elastic constant. Therefore, vibration isolation performance based on low dynamic elastic characteristics can be achieved for normal vibration input in the up-down direction and the left-right direction.

When a large-amplitude vibration is input in the up-down direction, the tubular portions 38 of the inner member 12 and the outer member 14 are indirectly abutted via the upper stopper rubber 30 and the lower stopper rubber 32, and the relative displacement amount of the inner member 12 and the outer member 14 is restricted. This prevents damage or the like caused by excessive deformation of the pair of rubber legs 18, and improves durability. In this way, the shaft-straightening stopper mechanism is configured to limit the vertical relative displacement between the inner member 12 and the outer member 14 by the abutment between the cylindrical portion 38 of the inner member 12 and the outer member 14 via the upper stopper rubber 30 and the lower stopper rubber 32.

When a large-amplitude vibration in the vertical direction is input, the pair of

rubber legs

18, 18 are largely compressed in the protruding direction by the branch

upper portions

22, 22 or the branch

lower portions

24, 24 depending on the input direction of the vibration. Then, the branch

upper portions

22, 22 or the branch

lower portions

24, 24 after the compression deformation are greatly bulged and deformed in the axial direction, and the axial end surfaces of the branch

upper portions

22, 22 or the branch

lower portions

24, 24 are pressed against the locking

projections

44, 44 and the anti-release projections 56, so that a force separating from each other in the front-rear direction acts between the tube portion 38 and the plate 36. Separation from the cylindrical portion 38 of the plate 36 caused by the force acting on the

anti-drop protrusions

56, 56 of the plate 36 is prevented by the fixing force of the caulking fixing portion 58. Here, the caulking fixing portion 58 is disposed at a position corresponding to the maximum input position of the abutment plate 36 of the branch

upper portions

22, 22 or the branch

lower portions

24, 24 and the drop-off preventing protrusions 56, that is, a position close to the maximum input position. Therefore, the moment applied to the caulking-fixing portion 58 is reduced by the abutment of the branch

upper portions

22, 22 or the branch

lower portions

24, 24 with the drop-off preventing protrusions 56, deformation (damage) of the caulking-fixing portion 58 is less likely to occur, durability of the caulking-fixing portion 58 is improved, separation of the plate 36 from the tube portion 38 is prevented, and the like.

However, when the inner member 12 is displaced upward relative to the outer member 14 to compress the branch upper portion 22, the maximum input position of the plate 36 is located above the extension line of the center line of the branch upper portion 22 in the width direction. In contrast, the caulking portion 58 located on the upper side of the extension line of the branch upper portion 22 is arranged so as to be offset to the upper side with respect to the extension line of the center line in the width direction of the branch upper portion 22, and is arranged so as to be closer to, in particular, the portion where the input becomes larger when the compression of the branch upper portion 22 by the vertical input occurs. This can further reduce the moment acting on the upper caulking portion 58, and prevent the plate 36 from being separated from the tubular portion 38 by improving the durability of the caulking portion 58.

When the inner member 12 is displaced downward relative to the outer member 14 to compress the branch lower portion 24, the maximum input position of the plate 36 is located below the extension line of the center line of the branch lower portion 24 in the width direction. In contrast, the caulking portion 58 located on the lower side of the extension line of the branch lower portion 24 is disposed so as to be offset to the lower side with respect to the extension line of the center line in the width direction of the branch lower portion 24, and is disposed so as to be closer to, in particular, the portion where the input becomes larger when the compression of the branch lower portion 24 by the vertical input occurs. This can further reduce the moment acting on the lower caulking portion 58, and prevent the plate 36 from being separated from the tubular portion 38 by improving the durability of the caulking portion 58.

It is to be noted that, strictly speaking, the position corresponding to the maximum input position to the plate 36 where the caulking fixing section 58 is disposed does not need to strictly coincide with the maximum input position to the plate 36.

When large-amplitude vibration in the front-rear direction is input, the main rubber elastic body 16 moves forward with respect to the outer member 14, and the branch

upper portions

22, 22 and the branch

lower portions

24, 24 can come into contact with the drop-preventing

protrusions

56, 56. In this case, a forward force is applied to separate the plate 36 from the cylindrical portion 38, but the plate 36 is prevented from falling off from the cylindrical portion 38 by the caulking fixing portion 58 disposed close to the input position due to the abutment between the branch

upper portions

22, 22 and the branch

lower portions

24, 24 and the falling-off preventing

protrusions

56, 56.

When the inner member 12 moves rearward greatly with respect to the outer member 14 due to the input of large-amplitude vibration in the front-rear direction, the stopper 70 of the inner bracket 64 indirectly abuts against the stopper abutment surface 72 of the outer member 14 covered with the cushion rubber 60. Accordingly, the rearward relative displacement of the inner member 12 with respect to the outer member 14 is restricted, the body rubber elastic body 16 is prevented from falling out rearward from the tube portion 38, and durability by excessive deformation of the pair of

rubber legs

18, 18 is improved. In this way, the abutment between the stopper 70 of the inner bracket 64 and the stopper abutment surface 72 of the outer member 14 via the cushion rubber 60 constitutes an axial stopper mechanism that limits the rearward relative displacement of the inner member 12 with respect to the outer member 14.

The cushion rubber 60 overlaps so as to span the abutting portion 48 of the plate 36 and the outer body 34, and a stopper abutment surface 72 constituting an axial stopper mechanism is provided so as to span the front surface of the plate 36 and the front surface of the abutting portion 48 of the outer body 34. In this way, in the structure in which the plate 36 is swaged and fixed to the front end surface of the tube portion 38 of the outer body 34 so as to overlap with the front end surface, the area of the stopper contact surface 72 can be ensured to be large.

In the outer body 34, the front surface of the abutting portion 48 is provided to protrude forward than the front surface of the tube portion 38. The front surface of the abutting portion 48 is located forward in such a manner as to protrude beyond the front surface of the barrel portion 38 by the thickness of the plate 36, and the front surface of the plate 36 overlapping the front surface of the barrel portion 38 is located on substantially the same plane as the front surface of the abutting portion 48. By obtaining the flat stopper contact surface 72 so as to extend across the front surface of the plate 36 and the front surface of the abutting portion 48, the stopper 70 can be prevented from being biased to abut against either one of the plate 36 and the abutting portion 48, and the effective pressure receiving area in the stopper contact surface 72 can be ensured to be large. Further, it is also considered that the front surface of the abutting portion 48 and the front surface of the plate 36 constituting the stopper abutting surface 72 are slightly displaced in the front-rear direction due to dimensional tolerances of components, assembly errors, and the like, but since the stopper 70 and the stopper abutting surface 72 abut against each other with the cushion rubber 60 interposed therebetween, such a slight positional displacement does not become a substantial problem.

The embodiments of the present invention have been described above in detail, but the present invention is not limited to the specific description thereof. For example, the rubber leg 18 is not necessarily limited to the two-strand shape having the branch upper portion 22 and the branch lower portion 24, and may be a straight shape protruding from the inner member 12 to the left and right sides, or the like. The pair of

rubber legs

18, 18 may be formed in a splayed shape, for example, so as to be inclined downward toward the outside in the lateral direction.

The arrangement of the caulking fixing section 58 can be appropriately changed in accordance with the assumed input direction of vibration or the like so as to correspond to the maximum input position of the board 36. For example, when a large-amplitude vibration in the left-right direction is input to the vibration isolation mount 10, the position of the caulking fixing portion 58 can be set at a position near the circumferential end portion on the side of the groove 20 on the extension line extending toward the outer periphery of the branch upper portion 22 and the branch lower portion 24. In addition, in the case where a greater fixing strength is required, the caulking fixing portion 58 may be provided not only at a position corresponding to the maximum input position of the plate 36 but also at a portion deviated from the position.

The main rubber elastic body 16 may further include other rubber legs in addition to the pair of

rubber legs

18, 18. Specifically, for example, the main body rubber elastic body may further include rubber legs extending at least one of upward and downward from the inner member 12 in addition to the pair of left and

right rubber legs

18, 18.

As in the above embodiment, the drop-off preventing protrusion 56 is preferably provided locally in the circumferential direction at a portion corresponding to the outer circumferential end portions of the rubber legs 18, but may be provided over the entire circumference. The locking protrusion 44 may be provided locally in the circumferential direction or may be provided over the entire circumference, as in the case of the disengagement preventing protrusion 56.

In the above embodiment, the inner member 12 is formed as a cylindrical member fixed to the inner peripheral portion of the main rubber elastic body 16 in a substantially embedded state, but for example, a member corresponding to the inner bracket 64 of the above embodiment may be used as the inner member. The inner member 12 need not be fixedly secured to the main rubber elastic body 16 and may be mounted in a non-adhesive manner.

In the above-described embodiment, the vibration isolation mount 10 for vibration-isolating and supporting the power unit such as the engine mount and the motor mount is shown as an example, but the present invention is also applicable to a vibration isolator for vibration-isolating and supporting other than the power unit such as the differential mount.

Claims

1. A vibration isolator (10) is provided, wherein an inner member (12) is disposed in a cylindrical portion (38) of an outer member (14), the inner member (12) and the outer member (14) are connected by a main rubber elastic body (16) which is non-adhesively fitted into the cylindrical portion (38),

it is characterized in that the method comprises the steps of,

the main rubber elastic body (16) is provided with a pair of rubber legs (18) extending along the opposite direction of the inner member (12) opposite to the cylinder part (38) at two sides of the inner member (12),

an engagement projection (44) protruding toward the inner periphery of the tubular part (38) and overlapping the outer peripheral ends of the pair of rubber legs (18) in the axial direction is provided at one axial end of the tubular part (38), and

a caulking protrusion (46) protruding from the other end surface in the axial direction of the tubular section (38) penetrates a caulking hole (54) of an annular plate (36) overlapping the other end surface in the axial direction of the tubular section (38) and is caulking-fixed to the plate (36),

the plate (36) fixed to the cylindrical portion (38) axially overlaps the outer peripheral end portions of the pair of rubber legs (18), the outer peripheral end portions of the pair of rubber legs (18) being axially positioned between the locking projection (44) and the plate (36),

the caulking fixing sections (58) by the caulking projections (46) and the caulking holes (54) are respectively arranged at positions corresponding to the maximum input positions with respect to the plate (36) by the pressing of the outer peripheral ends of the pair of rubber legs (18).

2. The vibration isolator (10) according to claim 1, wherein the caulking fixing portion (58) is disposed on an extension line of the pair of rubber legs (18) extending toward the outer peripheral side.

3. The vibration isolator (10) according to claim 2, wherein the caulking fixing portions (58) are provided at both end portions in the circumferential direction of each of the rubber legs (18) in the circumferential direction of the tubular portion (38), respectively.

4. A vibration isolator (10) according to claim 3, wherein each of the rubber legs (18) has a groove (20) which is open at an outer peripheral surface of a central portion of the rubber leg (18) in a circumferential direction of the tube portion (38) and penetrates the rubber leg (18) in an axial direction.

5. The vibration isolator (10) according to any one of claims 1 to 4, wherein stopper rubbers (30, 32) are provided between the pair of rubber legs (18) in the circumferential direction of the cylindrical portion (38), and the caulking fixing portion (58) is arranged so as to deviate from an extension line of the stopper rubbers (30, 32) in the circumferential direction of the cylindrical portion (38).

6. The vibration isolator (10) according to claim 5, wherein said plate (36) does not protrude inward from said cylindrical portion (38) at a position where said stopper rubber (30, 32) is disposed.

7. A vibration isolator (10) is provided, wherein an inner member (12) is disposed in a cylindrical portion (38) of an outer member (14), the inner member (12) and the outer member (14) are connected by a main rubber elastic body (16) which is non-adhesively fitted into the cylindrical portion (38),

it is characterized in that the method comprises the steps of,

an engagement projection (44) protruding toward the inner periphery of the tubular portion (38) and overlapping the outer peripheral end of the main rubber elastic body (16) in the axial direction is provided at one axial end of the tubular portion (38), and

a caulking protrusion (46) protruding from the other end surface in the axial direction of the tubular section (38) penetrates a caulking hole (54) of a plate (36) overlapping the other end surface in the axial direction of the tubular section (38) and is caulking-fixed to the plate (36),

the plate (36) fixed to the tube (38) overlaps the outer peripheral end portion of the main body rubber elastic body (16) in the axial direction, the outer peripheral end portion of the main body rubber elastic body (16) is positioned between the locking protrusion (44) and the plate (36) in the axial direction,

the surface of the plate (36) overlapping the other end surface of the tube (38) in the axial direction and the surface of the abutting portion (48) are on the same plane, the thickness of the plate (36) protruding axially to the other side of the tube (38) than the abutting portion (48) of the outer member (14) abutting the tube (38),

a stopper contact surface (72) on the outer member (14) side, which constitutes an axial stopper mechanism by contact with the inner member (12), is provided so as to extend across the surfaces of both the abutment portion (48) and the plate (36).

8. The vibration isolator (10) according to claim 7, wherein a cushion rubber (60) is superimposed on the stopper contact surface (72), and the cushion rubber (60) is provided so as to extend across both surfaces of the abutting portion (48) and the plate (36).

9. The vibration isolator (10) according to claim 7 or 8, wherein the stopper abutment surface (72) is provided at a position offset from the caulking hole (54) in the circumferential direction of the plate (36).