WO2011125667A1

WO2011125667A1 - Vibration isolation device

Info

Publication number: WO2011125667A1
Application number: PCT/JP2011/057870
Authority: WO
Inventors: 隆川嶋; 慶太西川; 勝己染谷
Original assignee: 株式会社ブリヂストン
Priority date: 2010-03-31
Filing date: 2011-03-29
Publication date: 2011-10-13

Abstract

Disclosed is a vibration isolation device (1) equipped with: a bracket (2) that is attached to either a vibration generating part or a vibration receiving part; and a main body member (3) provided with an attachment (4) that is attached to the other from among the vibration generating part and the vibration receiving part, and an elastic body (5) that is connected to the attachment (4). The elastic body (5) is equipped with extensible legs (43) that are disposed on one side in the vertical direction of the attachment (4) and that project towards the bracket (2), and fitting sections (54) that are disposed on the end of the legs (53). The bracket (2) is equipped with fitting recessions (26), into which the fitting sections (54) are fit, that are disposed on one side in the vertical direction of the attachment (4), and a stopper (25) that is disposed on the other side in the vertical direction of the attachment (4) and that restricts the displacement of the attachment (4) towards the other side in the vertical direction. The main body member (3) is mounted in the bracket (2) in a state sandwiched in the vertical direction by at least the stopper (25) and the fitting recessions (26) and applying a compressive force to the legs (53).

Description

Vibration isolator

The present invention relates to a vibration isolator that is used when, for example, a vibration generating unit such as an automobile engine is mounted on a vibration receiving unit such as a vehicle body.

Conventionally, for example, as shown in Patent Document 1 below, a bracket (second mounting member) attached to one of a vibration generating unit and a vibration receiving unit, and the other of the vibration generating unit and the vibration receiving unit There is known a vibration isolator including a main body member in which an elastic body (elastic leg) is joined to an attachment portion (first attachment member) attached to the body. The elastic body is provided with two leg main body portions each having an extendable leg portion protruding toward the bracket and a fitting portion provided at the tip of the leg portion. These leg main body portions are disposed below the attachment portion so as to be separated from each other as the distance from the attachment portion increases. A fitting concave portion (press-fit concave portion) into which the fitting portion is fitted is formed on the bottom plate portion side of the side plate portion of the bracket. Moreover, the stopper part (arch part) which restrict | limits the displacement to the upper direction of an attachment part is provided in the upper part of the bracket. The bracket is formed in a cylindrical shape by a pair of side plate portions, a bottom plate portion, and a stopper portion.

In the vibration isolator shown in Patent Document 1, the main body member is assembled inside the bracket by press-fitting the tip end portion (fitting portion) of the leg main body portion into the fitting concave portion of the bracket. In the state where the main body member is assembled inside the bracket, a gap is formed between the upper end portion (upper stopper portion) of the mounting portion and the stopper portion of the bracket.

In the vibration isolator disclosed in Patent Document 1, for example, a bracket is attached to a vibration receiving portion, and a vibration generating portion is attached to the attachment portion. When the vibration from the vibration generating unit is input, the elastic body absorbs the vibration, and the vibration transmitted to the vibration receiving unit is reduced. Also, if the vibration generating part vibrates with a large amplitude in the vertical direction, the upper end of the mounting part collides with the stopper part when rebounding (when the vibration generating part leaves the vibration receiving part), and the upward displacement of the mounting part is Be regulated. Thereby, the tensile force which acts on the leg part of an elastic body is restrict | limited, and the damage (crack etc.) of an elastic body by an excessive tensile force (extension) can be prevented.

Further, for example, as shown in Patent Document 2 below, a bracket (bracket fitting) attached to one of the vibration generating unit and the vibration receiving unit and the other of the vibration generating unit and the vibration receiving unit are attached. There has been known a vibration isolator including a main body member in which an elastic body is joined to an attachment portion (inner cylinder). The elastic body is provided with a pressure contact portion having a leg portion protruding toward the bracket and a fitting portion provided at the tip of the leg portion. The bracket is provided with a cylindrical portion (bracket cylindrical portion) into which the main body member is fitted, and side plate portions disposed on both sides of the cylindrical portion in the axial direction. The fitting portion is pressed from the outside in the axial direction by the side plate portion.

In the vibration isolator disclosed in Patent Document 2, even if vibration in the axial direction (axial direction of the cylindrical portion) is input, the fitting portion is pressed by the side plate portion, so the main body member is the cylindrical portion. It is possible to prevent getting out of the room.

JP 2003-74630 A JP 2006-234046 A

However, in the vibration isolator shown in Patent Document 1, in the state where the main body member is assembled inside the bracket, there is a gap between the upper end portion of the mounting portion and the stopper portion of the bracket. When the mounting portion is displaced above the position before the static load is input (position at the time of assembly), a tensile force acts on the leg portion of the elastic body. For this reason, when vibration is repeatedly input over a long period of time, cracks or the like may occur in the legs of the elastic body due to the tensile force, which may reduce the performance and life of the vibration isolator. In particular, when the vibration isolator is used as an engine mount, a tensile force acts on the leg portion of the elastic body under a high temperature environment due to the heat of the engine. The arc in the cross-sectional view at the base part of the leg part) becomes small, and the base tends to become the starting point of the crack, and the performance and life of the elastic body are likely to decrease.

Further, in the vibration isolator shown in Patent Document 1, as described above, when the leg main body is pulled upward during rebounding, the distal end surface of the fitting portion of the elastic body is separated from the fitting recess of the bracket, The frictional force between the fitting portion and the fitting recess is reduced. Therefore, when vibration is input in the axial direction (axial direction of the bracket) together with large vertical vibration, the body member may come out from the inside of the bracket in the axial direction due to the reduction of the frictional force. Further, when the leg main body is pulled upward at the time of rebounding, the fitting portion may come off from the fitting recess.
Moreover, in order to prevent the above-mentioned problem, there is a method in which the fitting portion of the elastic body is formed integrally with the leg portion with hard rubber, but the cost becomes high.

Moreover, in the vibration isolator shown in Patent Document 2, the edge of the side plate is in contact with the surface of the leg portion of the elastic body, so that when the vibration in the axial direction is input, the edge of the side plate is There is a possibility that the leg will be scratched. Since the leg portion expands and contracts at the time of vibration input, if the leg portion is scratched, the scratch easily develops, and even a small scratch causes a decrease in performance and a life of the elastic body (leg portion).

The present invention has been made in consideration of the above-described conventional problems, and provides a vibration isolator capable of suppressing a drop in performance and life of an elastic body and preventing a main body member from coming out of a bracket. It is an object.

According to the first aspect of the present invention, the vibration isolator includes a bracket attached to one of the vibration generator and the vibration receiver, and an attachment attached to the other of the vibration generator and the vibration receiver. And a main body member having an elastic body joined to the mounting portion. The elastic body includes an extendable leg portion that is disposed on one side in the vertical direction of the mounting portion and protrudes toward the bracket, and a fitting portion that is provided at a tip of the leg portion. . The bracket is disposed on one side in the vertical direction of the mounting portion and the fitting recess is engaged with the fitting portion, and the bracket is disposed on the other side in the vertical direction of the mounting portion and the vertical direction of the mounting portion. And a stopper portion that restricts displacement to the other side. The main body member is assembled to the bracket in a state where the main body member is sandwiched at least between the stopper portion and the fitting concave portion in a vertical direction and a compression force is applied to the leg portion.

According to the first aspect of the present invention, in a state where the main body member is assembled to the bracket, the attachment portion is pressed against the stopper portion, and the leg portion is compressed. When one of the vibration generating part and the vibration receiving part is attached to the bracket and the other of the vibration generating part and the vibration receiving part is attached to the mounting part, the mounting part is bracketed by the static load (support load) of the vibration generating part. Is displaced toward one side in the vertical direction relatively, and a gap is formed between the mounting portion and the stopper portion. In this state, when vibration is input from the vibration generating unit, the vibration is absorbed by the elastic body and the vibration transmitted to the vibration receiving unit is reduced. At this time, the mounting part is displaced relative to the bracket, but the body member is assembled to the bracket in a state where the leg part is compressed. The compression force is applied to the legs. Even if the attachment portion is relatively displaced until it comes into contact with the stopper portion at the time of rebound, the leg portion is hardly pulled and the leg portion is compressed. Therefore, even when rebounding, the fitting portion is not separated from the fitting recess, and the fitting portion is always in pressure contact with the fitting recess. Even when a large displacement is repeatedly input to the rebound side, the leg portion is always compressed. The leg creeps due to heat from the engine, and the root R becomes small, and the root may become the starting point of the crack, but since it is always in a compressed state, the crack generation can be suppressed. it can.

The bracket includes a cylindrical portion that extends horizontally and has the main body member fitted therein, and the fitting portion is pressed from the outside in the axial direction at an axial end portion of the cylindrical portion. A retaining portion may be provided.
In this case, the movement of the fitting portion relative to the fitting concave portion relative to the fitting concave portion is restricted by the retaining portion, and the main body member is prevented from slipping out from the bracket inner side in the axial direction.

Further, since the leg portion expands and contracts when vibration is input, if the leg portion is scratched, the scratch easily develops, and even a small scratch causes a decrease in performance and a life of the elastic body (leg portion).
Therefore, the edge of the retaining portion may be in contact with the fitting portion.
In this case, when the leg portion is compressed, its surface bulges outward in the axial direction, but even if the surface of the leg portion bulges, it is not pressed against the edge of the retaining portion, and the retaining portion The edges of the leg prevent the leg surface from being scratched.

Moreover, the said fitting part may protrude in the said axial direction outer side rather than the said leg part, and the level | step difference may be formed between the fitting part and the leg part.
In this case, even if the surface of the fitting portion is damaged by the edge portion of the retaining portion, the damage does not easily propagate to the leg portion.

In addition, the bracket consists of two parts. When the body member is assembled with the bracket by sandwiching the body member with these two parts and joining them by caulking or the like, a joining process for joining the two parts is required. The assembly process becomes complicated. Further, since the bracket is composed of two parts, the number of parts increases. Further, in order to fix the two parts by caulking or the like, it is necessary to form a portion to be overlapped on both sides, and the weight of the bracket is increased by this overlapped portion.
Therefore, the bracket may be a single component, and the main body member may be press-fitted inside the bracket.
In this case, the joining process as described above is unnecessary, the number of parts is reduced, and further, the overlapping portion described above is unnecessary.

According to the second aspect of the present invention, the vibration isolator is attached to one of the vibration generating unit and the vibration receiving unit, and to the other of the vibration generating unit and the vibration receiving unit. And a main body member having an elastic body joined to the mounting portion. The elastic body includes an extendable leg portion protruding toward the bracket, and a fitting portion provided at the tip of the leg portion. The bracket includes a cylindrical portion that extends horizontally and has the main body member fitted therein. An end portion in the axial direction of the cylindrical portion is provided with a retaining portion that presses the fitting portion from the outside in the axial direction, and an edge portion of the retaining portion is brought into contact with the fitting portion, and this fitting is performed. The portion protrudes outward in the axial direction from the leg portion, and a step is formed between the fitting portion and the leg portion.

According to the second aspect of the present invention, the movement of the fitting portion relative to the fitting recess relative to the fitting recess is restricted by the retaining portion, and the main body member is prevented from slipping out from the inner side of the bracket to the outer side in the axial direction. Is done.
Moreover, when vibration is input and the leg portion is compressed, the surface bulges outward in the axial direction, but the edge of the retaining portion is in contact with the fitting portion, so the surface of the leg portion Even if bulges out, it is not pressed against the edge of the retaining portion. Therefore, the leg surface is prevented from being damaged by the edge of the retaining portion.
Further, since a step is formed between the fitting portion and the leg portion, even if the surface of the fitting portion is damaged by the edge portion of the retaining portion, the damage hardly propagates to the leg portion.

Further, the leg portion is disposed on one side in the vertical direction of the mounting portion, and the bracket is disposed on one side in the vertical direction of the mounting portion, and the fitting portion is fitted. A concave portion and a stopper portion that is disposed on the other vertical side of the mounting portion and restricts displacement of the mounting portion to the other vertical direction, and the body member is fitted to at least the stopper portion and the fitting portion You may be assembled | attached to the said bracket in the state inserted | pinched by the recessed part at the perpendicular direction, and the compression force was provided to the said leg part.

In this case, in a state where the main body member is assembled to the bracket, the mounting portion is pressed against the stopper portion, and the leg portion is compressed. When one of the vibration generating part and the vibration receiving part is attached to the bracket and the other of the vibration generating part and the vibration receiving part is attached to the mounting part, the mounting part is bracketed by the static load (support load) of the vibration generating part. Is displaced toward one side in the vertical direction relatively, and a gap is formed between the mounting portion and the stopper portion. In this state, when vibration is input from the vibration generating unit, the vibration is absorbed by the elastic body and the vibration transmitted to the vibration receiving unit is reduced. At this time, the mounting part is displaced relative to the bracket, but the body member is assembled to the bracket in a state where the leg part is compressed. The compression force is applied to the legs. Even if the mounting portion is relatively displaced until it comes into contact with the stopper portion at the time of rebound, the leg portion is not pulled and the leg portion is compressed. Therefore, even when rebounding, the fitting portion is not separated from the fitting recess, and the fitting portion is always in pressure contact with the fitting recess. Even when a large displacement is repeatedly input to the rebound side, the leg portion is always compressed. The leg creeps due to heat from the engine, and the root R becomes small, and the root may become the starting point of the crack, but since it is always in a compressed state, the crack generation can be suppressed. it can.

According to the 1st aspect of this invention, even if it is a case where a big displacement is repeatedly input into the rebound side, a leg part will always be in the state compressed. The leg R creeps due to the heat from the engine, and the root R becomes small, and the root may become the starting point of the crack. It is possible to suppress a decrease in performance and a lifetime of the elastic body.
Further, even when the mounting portion is greatly displaced to the rebound side, the fitting portion is always in pressure contact with the fitting recess, so that the frictional force between the fitting portion and the fitting recess is maintained. The frictional force can prevent the main body member from coming out of the bracket. Therefore, even when vertical vibration is input and the attachment portion is displaced in the axial direction relative to the bracket, the main body member is difficult to come out of the bracket, and the main body member and the bracket are separated. Can be prevented.

According to the 2nd aspect of this invention, since the movement to the axial direction outer side of a fitting part is controlled by the securing part, it can prevent that a main body member slips out from the inner side of a bracket.
Further, since the edge of the retaining portion is in contact with the fitting portion and the edge of the retaining portion is not pressed against the leg, it is possible to prevent the leg from being damaged by the edge of the retaining portion. . In addition, a step is formed between the fitting part and the leg part, and even if the fitting part is damaged by the edge of the retaining part, the damage does not easily propagate to the leg part. Formation of cracks can be prevented. Accordingly, it is possible to suppress a decrease in performance and a life of the elastic body.

It is a front view of the vibration isolator in embodiment of this invention. It is a disassembled perspective view of the vibration isolator in embodiment of this invention. FIG. 2 is a cross-sectional view taken along line AA shown in FIG. It is a front view of the vibration isolator in the 1st modification of this invention. It is a front view of the vibration isolator in the 2nd modification of this invention.

Embodiments of a vibration isolator according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view of the vibration isolator 1 in the present embodiment, and FIG. 2 is an exploded perspective view of the vibration isolator 1. FIG. 3 is a cross-sectional view taken along line AA in FIG.
The vibration isolator 1 of the present embodiment is the direction in which a static load (support load) is input when the lower side in FIG. 1 is the bounce side, that is, when the vibration isolator 1 is installed. The upper side is the rebound side, that is, the opposite side of the static load input direction. In the following description, the bound side is referred to as “lower side”, the rebound side is referred to as “upper side”, and the bound-rebound direction (Z direction shown in FIG. 2) is referred to as “vertical direction”. Further, in the present embodiment, the axial direction (Y direction shown in FIG. 2) of the cylindrical portion 22 and the mounting portion 4 of the bracket 2 to be described later is the vehicle left-right direction, and is hereinafter referred to as “axial direction”. Further, a horizontal direction (X direction shown in FIG. 2) orthogonal to the axial direction of the cylindrical portion 22 and the mounting portion 4 is the vehicle front-rear direction, and is hereinafter referred to as “width direction”.

The vibration isolator 1 is a vehicle engine mount for mounting an unillustrated engine (corresponding to a vibration generating portion in the present invention) on a not-shown vehicle body (corresponding to a vibration receiving portion in the present invention). This is a device for reducing vibration transmitted from the engine to the vehicle body. As shown in FIGS. 1 and 2, the vibration isolator 1 includes a bracket 2 attached to a vehicle body (not shown), and a main body member 3 assembled inside the bracket 2. The main body member 3 includes a mounting portion 4 that is attached to an engine (not shown) via an engine bracket (not shown), and an elastic body 5 that is joined to the mounting portion 4 and is held by the bracket 2.

The mounting portion 4 is a cylindrical metal fitting that is open at both ends, and is an inner cylinder disposed inside the bracket 2. The mounting portion 4 is disposed so as to extend in a direction parallel to an axis of a cylindrical portion 22 described later in the bracket 2. Further, a fastening member such as a bolt (not shown) for fastening to an engine bracket (not shown) is inserted inside the mounting part 4, and the engine bracket is connected to an end of the mounting part 4.

The elastic body 5 is a rubber elastic body made of a rubber material such as natural rubber, styrene / butadiene rubber (SBR), or butadiene rubber (BR), and is vulcanized and molded together with the mounting portion 4 to form the mounting portion 4. It is joined to the outer peripheral surface. The elastic body 5 includes a bounce buffer 50 disposed below the mounting portion 4, a rebound buffer 51 disposed above the mounting portion 4, and both sides of the mounting portion 4 in the width direction.

Side buffer portions

52, 52, a pair of

leg portions

53, 53 projecting toward the bracket 2 (an inner peripheral surface of a cylindrical portion 22 to be described later), and provided at the tips of the

leg portions

53, 53, respectively. Fitting

portions

54, 54.

The bound buffer portion 50 is a rubber body that covers the lower surface of the mounting portion 4, and is formed in a substantially triangular shape that is gradually reduced in width as viewed in the direction of the arrow from the axial direction. The rebound buffer portion 51 is a rubber body that covers the upper surface of the attachment portion 4, and is formed in an arc shape formed along the upper surface of the attachment portion 4 when viewed from the axial direction. The

side buffer parts

52, 52 are rubber bodies that cover the side surfaces of the attachment part 4, and protrude toward the outer side in the width direction.

The leg portion 53 is a support portion that is disposed on the lower side (one side in the vertical direction) of the mounting portion 4 and supports the mounting portion 4, and is disposed at a position that is compressed when a static load is applied. . Further, the pair of

leg portions

53 and 53 are disposed symmetrically with respect to the central vertical line of the attachment portion 4. More specifically, the pair of

leg portions

53, 53 project obliquely downward from the bound buffer portion 50, are arranged close to the lower side of the mounting portion 4, and are viewed in the direction of the arrow from the axial direction. It arrange | positions so that it may mutually space apart as it goes below.

The fitting part 54 is a fixed part fixed to the bracket 2 and protrudes from the lower end of the leg part 53 outward in the width direction. More specifically, the fitting portion 54 is formed in a substantially rectangular parallelepiped shape, and the fitting portion 54 includes an upper surface 54 a that protrudes outward in the width direction from the lower end of the inclined outer surface 53 a of the leg portion 53, and A side surface 54b extending downward in the vertical direction from the tip of the upper surface 54a and a lower surface 54c extending horizontally from the lower end of the side surface 54a toward the inner side in the width direction are formed. Further, the surfaces 54d on both sides in the axial direction of the fitting portion 54 protrude outward in the axial direction from the surface 53b facing the outside in the axial direction of the leg portion 53, and the surfaces 54d on both sides in the axial direction of the fitting portion 54 A step 55 is formed between the surface 53 b of the leg portion 53.

The bracket 2 is a metal fitting that surrounds and holds the main body member 3. More specifically, the bracket 2 extends downward from a lower plate 20 extending along the width direction, a rectangular upper plate portion (not shown) parallel to the horizontal plane, and both widthwise end portions of the upper plate portion. And an upper plate 21 composed of a pair of side plate portions (not shown). In the bracket 2, lower ends on both sides in the width direction of the upper plate 21 are placed on the upper surface of the lower plate 20, and lower ends on both sides in the width direction of the upper plate 21 are welded to the upper surface of the lower plate 20. Both axial ends of the side plate portion of the upper plate 21 are welded to rib plates 28 described later. Thereby, the bracket 2 is formed with a rectangular tubular portion 22 that extends in the axial direction and into which the main body member 3 is fitted. Further, the bracket 2 is a single component in which a bound stopper portion 23, a side stopper portion 24, a rebound stopper portion 25, and a fitting concave portion 26, which will be described later, are integrally formed.

Both end portions of the lower plate 20 protrude outward in the width direction of the upper plate 21 (cylindrical portion 22) and extend toward the outer side in the width direction. Bolt holes 27 through which bolts (not shown) for fastening to a vehicle body (not shown) are inserted are formed at both ends of the lower plate 20. In addition, rib plates 28 extending vertically upward are respectively provided on both side portions in the axial direction of both ends of the lower plate 20.

In addition, a bound stopper portion 23 that restricts the downward displacement of the attachment portion 4 is formed on the lower surface portion of the cylindrical portion 22, that is, the central portion in the length direction (width direction) of the lower plate 20.
The bound stopper portion 23 abuts against the bound buffer portion 50 when the attachment portion 4 is displaced downward in the vertical direction to a certain position relative to the bracket 2 so that the attachment portion 4 is displaced downward. It is the part to regulate. More specifically, the bound stopper portion 23 is a convex portion protruding upward, and is disposed between the pair of leg portions 53 and 53 (fitting portions 54 and 54) and the bound buffer portion. It is arranged below 50 at a distance.

Further, side stopper portions 24 for restricting the displacement of the mounting portion 4 to the outside in the width direction are formed on the side surface portions on both sides in the width direction of the cylindrical portion 22, that is, on the side plate portions on both sides in the width direction of the upper plate 21. Yes. The side stopper portion 24 abuts on the side buffer portion 52 when the mounting portion 4 is displaced outward in the width direction to a certain position relative to the bracket 2, and the side stopper portion 24 is displaced outward in the width direction of the mounting portion 4. The side buffering part 52 is disposed at an interval on the outer side in the width direction.

Further, the lower corners on both sides in the width direction of the cylindrical portion 22, that is, the lower ends on both sides in the width direction of the upper plate 21, are fitted below the attachment portion 4 and fitted with the fitting portions 54. Joint recesses 26 are respectively formed. The fitting recess 26 is a recess that is recessed toward the radially outer side of the cylindrical portion 22. More specifically, the fitting recess 26 includes an upper surface 26a that protrudes outward in the width direction from the lower end of the side stopper portion 24, a side surface 26b that extends downward from an end portion of the upper surface 26a in the width direction, and a side surface. It is formed by the horizontal lower surface 26c formed between the lower end of 26b and the above-mentioned bound stopper part 23. The upper surface 26 a of the fitting recess 26 is in close contact with the upper surface 54 a of the fitting portion 54. Further, the side surface 26 b of the fitting recess 26 is in close contact with the side surface 54 b of the fitting portion 54. Further, the lower surface 26 c of the fitting recess 26 is in close contact with the lower surface 54 c of the fitting portion 54.

In addition, a rebound stopper portion 25 (corresponding to the stopper portion in the present invention) that restricts the displacement of the mounting portion 4 in the vertical direction is formed in the upper portion of the cylindrical portion 22, that is, the upper plate portion of the upper plate 21. Has been. The rebound stopper portion 25 is a portion that regulates the upward displacement of the attachment portion 4 when the attachment portion 4 is displaced upward in the vertical direction to a certain position relative to the bracket 2. 51 is in pressure contact.

Further, at both end portions in the axial direction of the cylindrical portion 22, a retaining portion 29 for pressing the fitting portion 54 from the outside in the axial direction is provided. The retaining portion 29 is a plate portion erected along the vertical direction from side end portions on both sides in the axial direction of the lower surface portion of the cylindrical portion 22, and is formed flush with and integrally with the rib plate 28. . The retaining portion 29 is formed in a substantially L shape when viewed from the axial direction, and its edge (edge) abuts on the surface 54d (surface facing outward in the axial direction) of the fitting portion 54. Has been.

Further, as shown in FIGS. 1 to 3, oblique flanges 30 projecting to the outer peripheral side (radially outward) of the cylindrical portion 22 are respectively provided at both axial ends of the cylindrical portion 22. The oblique flange 30 is formed at the upper part of the axial end portion of the upper plate 21, is connected to the upper plate 21 (wall portion of the cylindrical portion) at an obtuse angle, and gradually increases toward the outer side in the axial direction. It is inclined in a direction away from the central axis of the cylindrical portion 22.

The main body member 3 is assembled to the bracket 2 by being press-fitted from the outside in the axial direction of the bracket 2 to the inside of the bracket 2 (tubular portion 22). At this time, the main body member 3 is compressed and sandwiched between the lower surface of the rebound stopper portion 25 and the

lower surfaces

26c and 26c (horizontal surfaces) of the

fitting recesses

26 and 26, and the fitting recesses 26 on both sides. The side surfaces 26b and 26b (vertical surfaces) of the 26 are compressed and sandwiched in the width direction. Thereby, the compression force is applied to the leg portions 53 of the main body member 3.

That is, the overall height molding dimension (vertical dimension from the lower surface 54 c of the fitting portion 54 to the upper surface of the rebound buffer portion 51) of the main body member 3 in the unloaded state before being assembled to the bracket 2 is the inner side of the cylindrical portion 22. It is set larger than the height dimension (the vertical dimension from the lower surface 26c of the fitting recess 26 to the lower surface of the rebound stopper portion 25). Further, the molding dimension of the full width of the main body member 3 in the no-load state (the horizontal dimension from the side surface 54b of one fitting portion 54 to the side surface 54b of the other fitting portion 54) is the

fitting recesses

26, 26 on both sides. The width dimension between them (the horizontal dimension from the side surface 26b of one fitting recess 26 to the side surface 26b of the other fitting recess 26) is set larger. In addition, the main body member 3 is disposed inside the cylindrical portion 22 in a state where the elastic body 5 is contracted in the vertical direction and the width direction with a jig or the like (not shown). At this time, the

leg portions

53 and 53 are compressed in the protruding direction, and the protruding length is shortened. Thereafter, by removing the jig, the elastic body 5 expands due to the elasticity of the elastic body 5, and the

lower surfaces

54c, 54c of the

fitting portions

54, 54 are pressed against the

lower surfaces

26c, 26c of the

fitting recesses

26, 26. The upper surface of the rebound buffer 51 is pressed against the lower surface of the rebound stopper 25. Furthermore, the side surfaces 54 b and 54 b of the

fitting portions

54 and 54 of the elastic body 5 are pressed against the side surfaces 26 b and 26 b of the

fitting recesses

26 and 26. As a result, a compressive force is applied to the

leg portions

53 and 53.

Next, a method for manufacturing the vibration isolator 1 will be described.

First, the bracket 2 is manufactured by welding the lower plate 20 and the upper plate 21. More specifically, the lower plate 20 and the upper plate 21 are separately formed by pressing. At this time, the oblique flange 30 is formed on the upper plate 21 by pressing, and the rib plate 28 is formed on the lower plate 20 by pressing. Subsequently, the upper plate 21 is disposed on the lower plate 20, the lower end of the upper plate 21 is welded to the upper surface of the lower plate 20, and both axial ends of the lower portion of the upper plate 21 are connected to the rib plates 28 of the lower plate 20. Weld to each. Thereby, the bracket 2 which has the cylindrical part 22 is manufactured.

Also, the elastic body 5 is vulcanized and formed, and vulcanized and bonded to the mounting portion 4 to manufacture the main body member 3. More specifically, the mounting portion 4 is disposed at a predetermined position in a mold (elastic body mold) (not shown) for forming the elastic body 5, and an adhesive base treatment is applied to the outer peripheral surface of the mounting portion 4. Later, an adhesive is applied. Thereafter, the unvulcanized rubber is injected into the elastic body mold described above to form the elastic body 5. Subsequently, the elastic body 5 is vulcanized by applying sulfur gas, pressure and heat to the elastic body 5. At this time, the elastic body 5 is joined to the outer peripheral surface of the mounting portion 4. Subsequently, the main body member 3 is formed by removing the elastic body mold.

Next, the main body member 3 is press-fitted inside the cylindrical portion 22 of the bracket 2 while being compressed in the width direction and the vertical direction by a compression jig (not shown). As a compression jig (not shown), for example, a jig composed of a pair of sandwiching members can be used. In this case, the main body member 3 is sandwiched between the pair of sandwiching members, and the pair of sandwiching members are tightened to compress the main body member 3 in the width direction and the vertical direction, respectively. Thereafter, the main body member 3 together with the compression jig is arranged on the outer side in the axial direction of the cylindrical portion 22, and the main body member 3 inside the compression jig is pushed toward the inner side of the cylindrical portion 22 to be press-fitted into the cylindrical portion 22. At this time, the upper portion of the elastic body 5 (rebound buffer portion 51) slides on the surface of the oblique flange 30 formed at the axial end of the cylindrical portion 22, and is caused by the reaction force from the surface of the oblique flange 30. The main body member 3 is press-fitted inside the cylindrical portion 22 while the leg portions 53 of the elastic body 5 are compressed. In this way, the main body member 3 is guided by the oblique flange 30, and the main body member 3 can be easily press-fitted inside the cylindrical portion 22. When the main body member 3 is transferred from the inside of the compression jig (not shown) to the inside of the cylindrical portion 22, the pair of

leg portions

53, 53 of the elastic body 5 is restored by elastic force, and the

leg portions

53, 53 Each fitting portion 54 is fitted inside the

fitting recess

26, 26 of the cylindrical portion 22, and the rebound buffer portion 51 is in close contact with the rebound stopper portion 25.
The vibration isolator 1 is completed by the above manufacturing method.

Next, the operation of the vibration isolator 1 will be described.

First, the bracket 2 is attached to a vehicle body (not shown) and attached to the engine (not shown) via an engine bracket (not shown) to the attachment portion 4. As a result, an engine load (static load) (not shown) acts on the mounting portion 4, and the mounting portion 4 is displaced downward relative to the bracket 2. As a result, the

legs

53 and 53 are compressed and shortened, and the rebound buffer 51 is separated from the rebound stopper 25 and a predetermined gap is formed between the upper surface of the rebound buffer 51 and the lower surface of the rebound stopper 25. Is formed.

Next, when engine vibration (not shown) is input to the mounting portion 4 via an engine bracket (not shown), the mounting portion 4 is displaced relative to the bracket 2. At this time, the vibration is absorbed by the elastic body 5 and the vibration transmitted to the vehicle body (not shown) via the bracket 2 is reduced. Moreover, since the main body member 3 is assembled in the cylindrical portion 22 of the bracket 2 with the

legs

53 and 53 compressed, at the time of rebound (when the rebound buffer portion 51 contacts the rebound stopper portion 25). In addition, no tensile force acts on the

legs

53 and 53, and the

legs

53 and 53 are always compressed. Therefore, even when rebounding, the fitting portion 54 is pressed against the fitting recess 26, and the side surface 54b and the lower surface 54c of the fitting portion 54 are not separated from the side surface 26b and the lower surface 26c of the fitting recess 26, The side surface 54b and the lower surface 54c of the fitting portion 54 are always in pressure contact with the side surface 26b and the lower surface 26c of the fitting recess 26.

Further, when an engine (not shown) vibrates with a large amplitude in the vertical direction and the mounting portion 4 is greatly displaced downward, the bound buffer portion 50 of the elastic body 5 comes into contact with the bound stopper portion 23. On the contrary, when the attachment portion 4 is largely displaced upward, the rebound buffer portion 51 of the elastic body 5 contacts the rebound stopper portion 25. Thereby, the displacement of the attachment portion 4 in the vertical direction is restricted, and the expansion / contraction deformation of the

leg portions

53 and 53 due to the large vibration is restricted. In addition, as described above, even if the attachment portion 4 is displaced upward so that the rebound buffer portion 51 contacts the rebound stopper portion 25, the compression force is always applied to the

leg portions

53 and 53 without applying the tensile force. Thus, the side surface 54b and the lower surface 54c of the fitting portion 54 are always in pressure contact with the side surface 26b and the lower surface 26c of the fitting recess 26.

Further, for example, when the vehicle suddenly accelerates or decelerates suddenly, an engine (not shown) is displaced in the width direction (vehicle front-rear direction), and the mounting portion 4 is largely displaced in the width direction relative to the bracket 2. There is a case. At this time, the

side buffer parts

52, 52 of the elastic body 5 abut on the side stopper part 24. Thereby, the displacement to the width direction of the attaching part 4 is controlled, and the expansion-contraction deformation of the

leg parts

53 and 53 accompanying the vibration of the width direction is restrict | limited. At this time, no tensile force acts on the

legs

53, 53, and the

legs

53, 53 are always compressed, and the side surface 54b and the lower surface 54c of the fitting portion 54 are the side surfaces 26b of the fitting recess 26. In other words, it is always in pressure contact with the lower surface 26c.

Further, for example, when the vehicle suddenly curves, an engine (not shown) may be displaced in the axial direction (vehicle left-right direction), and the mounting portion 4 may be displaced in the axial direction relative to the bracket 2. At this time, the movement of the fitting portion 54 to the outside in the axial direction relative to the fitting recess 26 is restricted by the retaining portion 29. Thereby, it is prevented that the main body member 3 slips out from the inner side of the bracket 2 (tubular portion 22) to the outer side in the axial direction.

As described above, when the leg portion 53 is compressed, the surface 53b bulges outward in the axial direction, but the edge portion of the retaining portion 29 is in contact with the surface 54d of the fitting portion 54. Therefore, even if the surface 53b of the leg portion 53 swells, it is not pressed against the edge portion of the retaining portion 29, and the surface 53b of the leg portion 53 is prevented from being damaged by the edge portion of the retaining portion 29.
Moreover, since the surface 54d of the fitting portion 54 protrudes outward in the axial direction from the surface 53b of the leg portion 53, a step 55 is formed between the surface 54d of the fitting portion 54 and the surface 53b of the leg portion 53. Even if the surface 54 d of the fitting portion 54 is damaged by the edge portion of the retaining portion 29, the damage does not easily propagate to the leg portion 53.

According to the vibration isolator 1 in the present embodiment, when the main body member 3 is press-fitted inside the cylindrical portion 22, the oblique flange 30 serves as a guide, so the main body member 3 is press-fitted inside the cylindrical portion 22. The main body member 3 can be easily assembled to the bracket 2.

Further, since the main body member 3 is compressed into the cylindrical portion 22 in a state compressed in the width direction and the vertical direction, when the main body member 3 is press-fitted into the cylindrical portion 22, the main body member 3 is cylindrical. It becomes difficult to be caught by the part 22, and the main body member 3 is smoothly press-fitted inside the cylindrical part 22. Thereby, the main body member 3 can be easily assembled to the bracket 2.

Further, according to the vibration isolator 1 in the present embodiment, the leg portion 53 is always compressed even when a large displacement is repeatedly input to the rebound side. Since the leg 53 is creeped by heat from the engine (not shown), the root R becomes small and the root may become a starting point of the crack. It can suppress, and the performance fall and lifetime fall of the elastic body 5 can be suppressed.

Further, even when the mounting portion 4 is largely displaced to the rebound side, the fitting portion 54 is always in pressure contact with the fitting recess 26, so that the gap between the fitting portion 54 and the fitting recess 26 is The frictional force is maintained, and the frictional force can prevent the main body member 3 from coming out of the bracket 2. Therefore, even when vertical vibration is input and the attachment portion 4 is displaced in the axial direction relative to the bracket 2, the main body member 3 becomes difficult to come out of the bracket 2. It is possible to prevent the bracket 2 from being separated.

Further, since the movement of the fitting portion 54 to the outer side in the axial direction relative to the fitting concave portion 26 is restricted by the retaining portion 29, the main body member 3 can be reliably prevented from coming out from the inner side of the bracket 2. .

In addition, since the edge of the retaining portion 29 is in contact with the surface 54 d of the fitting portion 54 and the edge of the retaining portion 29 is not pressed against the surface 53 b of the leg portion 53, the edge portion of the retaining portion 29 is The surface 53b of 53 can be prevented from being scratched, and the performance and life of the elastic body 5 can be suppressed.
Furthermore, a step 55 is formed between the surface 54d of the fitting portion 54 and the surface 53b of the leg portion 53. Even if the surface 54d of the fitting portion 54 is damaged by the edge of the retaining portion 29, Since the scratch does not easily propagate to the leg portion 53, it is possible to prevent the leg portion 53 from being cracked, and to suppress the performance reduction and the life reduction of the elastic body 5.

Further, in the vibration isolator 1 according to the present embodiment, the bracket 2 is a single part, and the main body member 3 is assembled to the bracket 2 by press-fitting the main body member 3 inside the bracket 2. The number can be reduced. Furthermore, since it is not necessary to form an overlapping portion for caulking or the like on the bracket 2, the bracket 2 can be reduced in weight and the vibration isolator 1 can be reduced in weight.

As mentioned above, although the embodiment of the vibration isolator according to the present invention has been described, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof.
For example, in the above-described embodiment, the bound stopper portion 23 and the

side stopper portions

24, 24 are formed on the bracket 2. However, in the present invention, the bound stopper portion 23 and the side stopper portion 24 may be omitted. Is possible.

Further, in the above-described embodiment, the elastic body 5 is provided with the bounce buffer 50, the rebound buffer 51, and the

side buffer

52, 52 on both sides. It can be omitted. For example, a buffer part may be provided on the inner peripheral surface of the cylindrical part 22, and the mounting part 4 may be in direct contact with the buffer part.

In the above-described embodiment, the bracket 2 having the rectangular tube-shaped cylindrical portion 22 is provided, but the present invention may use a bracket having a cylindrical portion having another shape. For example, a bracket having a U-shaped cylindrical portion in a cylindrical shape or an arrow view from the axial direction may be used. Furthermore, it is possible to use a bracket in which the cylindrical portion 22 is not formed.

In the embodiment described above, the bracket 2 is connected to the vehicle body (vibration receiving portion) and the mounting portion 4 is connected to the engine (vibration generating portion). However, in the present invention, the bracket 2 is connected to the engine (vibration generating portion). The attachment portion 4 may be connected to the vehicle body (vibration receiving portion). In this case, the vibration isolator 1 may be used upside down in FIG.

Further, in the above-described embodiment, the elastic body 5 is provided with a pair of

leg portions

53, 53 disposed symmetrically with respect to the vertical center line, and the pair of

leg portions

53, 53 is the attachment portion 4. The legs in the present invention are compressed when a static load is applied. The orientation of the legs can be changed. For example, when attaching a vibration generating part such as an engine to the bracket 2 and attaching a vibration receiving part such as a vehicle body to the attachment part 4, the leg part is arranged close to the upper part of the attachment part 4, for example, in a substantially V shape. Legs may be provided. Furthermore, when increasing the rigidity in the vehicle front-rear direction, the legs can be arranged in a substantially X shape.
In the present invention, one or three or more legs may be provided, and the plurality of legs 53 may not be arranged symmetrically.

In the above-described embodiment, the fitting recess 26 is disposed on the lower side of the mounting portion 4, the

leg portions

53, 53 are disposed on the lower side of the mounting portion 4, and the shaft In the direction of the arrow from the direction, they are arranged so as to be separated from each other and compressed when a static load is applied. In the present invention, the fitting concave portion 26 and the leg portion 53 are arranged in the vertical direction of the mounting portion 4. It does not need to be arranged on one side. For example, as shown in FIG. 4, a pair of fitting recesses 126 are disposed in the cylindrical portion 122 at symmetrical positions, and the pair of

leg portions

153 and 153 are provided so as to extend in directions opposite to each other. The apparatus 101 may be used. In FIG. 4, reference numeral 102 indicates a bracket, reference numeral 103 indicates a main body member, reference numeral 104 indicates a mounting portion, reference numeral 105 indicates an elastic body, reference numeral 125 indicates a stopper portion, and reference numeral 129 indicates a retaining portion. Reference numeral 154 indicates a fitting portion, and reference numeral 155 indicates a step.

Furthermore, a vibration isolator 201 shown in FIG. 5 may be used as a further modification of the vibration isolator 101 shown in FIG. The anti-vibration device 201 is different from the anti-vibration device 101 in that an oblique flange 130 is provided at the edge of the retaining portion 129. The oblique flange 130 is provided so as to be inclined outward in the radial direction from the edge of the retaining portion 129 toward the outer side in the axial direction of the cylindrical portion 122. According to this modification, when the main body member 1033 is press-fitted inside the cylindrical portion 122, the oblique flange 130 serves as a guide, so that the main body member 103 can be easily press-fitted inside the cylindrical portion 122, and the main body member 103 can be pressed. It can be easily assembled to the bracket 102.

Further, the vibration isolator according to the present invention is not limited to a vehicle engine mount, but can be applied to a vibration isolator other than the engine mount. For example, the present invention can be applied to a mount of a generator mounted on a construction machine, or can be applied to a mount of a machine installed in a factory or the like.

In the above-described embodiment, the lower plate 20 and the upper plate 21 are integrally welded, the bracket 2 is made of a single part, and the main body member 3 is press-fitted inside the bracket 2 (tubular portion 22). However, in the present invention, it is also possible to assemble a plurality of parts to form a bracket. For example, a bracket formed by joining two parts (the lower plate 20 and the upper plate 21) by caulking or the like may be used. In this case, the main body member 3 is sandwiched between these two parts and these are caulked and fixed. Thus, the main body member 3 can be assembled to the bracket 2.

Further, in the above-described embodiment, the step 55 is formed between the surface 54d of the fitting portion 54 and the surface 53b of the leg portion 53. However, in the present invention, the step 55 is not formed. It is also possible, and the surface 54d of the fitting portion 54 and the surface 53b of the leg portion 53 may be formed flush with each other.

In the above-described embodiment, the edge of the retaining portion 29 is in contact with the surface 54d of the fitting portion 54. However, in the present invention, the edge of the retaining portion 29 contacts the surface 54d of the fitting portion 54. For example, the edge of the retaining portion 29 may protrude above the fitting portion 54.
Further, in the present invention, the retaining portion 29 described above can be omitted.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the gist of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 1,101,201 Vibration isolator 2,102 Bracket 3,103 Main body member 4,104 Attachment part 5,105 Elastic body 22,122 Cylindrical part 25,125 Rebound stopper part (stopper part)
26, 126

Fitting recess

29, 129

Detachment part

53, 153

Leg part

54, 154

Fitting part

55, 155 Step

Claims

A bracket attached to one of the vibration generator and the vibration receiver;
A main body member having an attachment portion attached to the other of the vibration generating portion and the vibration receiving portion, and an elastic body joined to the attachment portion;
With
The elastic body includes an extendable leg portion that is disposed on one side in the vertical direction of the mounting portion and protrudes toward the bracket, and a fitting portion that is provided at a tip of the leg portion. In the vibration isolator,
The bracket is disposed on one side in the vertical direction of the mounting portion and the fitting recess is fitted into the bracket, and the bracket is disposed on the other side in the vertical direction of the mounting portion and in the vertical direction of the mounting portion. A stopper portion for limiting displacement to the other side,
The vibration isolator is attached to the bracket in a state in which the main body member is sandwiched in the vertical direction at least by the stopper portion and the fitting concave portion and a compression force is applied to the leg portion.
The vibration isolator according to claim 1,
The bracket includes a cylindrical portion that extends horizontally and has the body member fitted therein.
An anti-vibration device in which an end portion in the axial direction of the tubular portion is provided with a retaining portion that holds the fitting portion from the outside in the axial direction.
The vibration isolator according to claim 2,
An anti-vibration device in which an edge of the retaining portion is in contact with the fitting portion.
The vibration isolator according to claim 3,
The anti-vibration device wherein the fitting portion protrudes outward in the axial direction from the leg portion, and a step is formed between the fitting portion and the leg portion.
In the vibration isolator as described in any one of Claim 1 to 4,
The vibration isolator in which the bracket is a single component and the main body member is press-fitted inside the bracket.
A bracket attached to one of the vibration generator and the vibration receiver;
A main body member having an attachment portion attached to the other of the vibration generating portion and the vibration receiving portion, and an elastic body joined to the attachment portion;
With
In the vibration isolator, the elastic body includes an extendable leg projecting toward the bracket, and a fitting part provided at a tip of the leg.
The bracket includes a cylindrical portion that extends horizontally and has the body member fitted therein.
An end portion in the axial direction of the cylindrical portion is provided with a retaining portion that presses the fitting portion from the outside in the axial direction, and an edge portion of the retaining portion is brought into contact with the fitting portion, and the fitting portion An anti-vibration device in which a part projects outward in the axial direction from the leg part, and a step is formed between the fitting part and the leg part.
The vibration isolator according to claim 6, wherein the leg portion is disposed on one side in the vertical direction of the mounting portion,
The bracket is disposed on one side in the vertical direction of the mounting portion and the fitting recess is fitted into the bracket, and the bracket is disposed on the other side in the vertical direction of the mounting portion and in the vertical direction of the mounting portion. A stopper portion for limiting displacement to the other side,
The vibration isolator is attached to the bracket in a state in which the main body member is sandwiched in the vertical direction at least by the stopper portion and the fitting concave portion and a compression force is applied to the leg portion.
The vibration isolator according to claim 6 or 7,
The vibration isolator in which the bracket is a single component and the main body member is press-fitted inside the bracket.