JP4890431B2 - Cylindrical anti-vibration mount - Google Patents

Description

  The present invention relates to an annular fitting formed with a flange portion projecting outward from the upper end of a cylindrical body portion, a center fitting provided above the center line of the annular fitting, and an annular fitting and a center. A rubber member that is disposed between the brackets and connects the brackets, and a stopper bracket that functions as a stopper that limits the relative displacement of the annular bracket and the center bracket. The present invention relates to a vibration isolator having a drainage window, and more particularly to a device capable of improving the strength and durability of a caulking portion.

  FIG. 1 is a perspective view showing a conventional vibration isolator (see, for example, Patent Document 1), FIG. 2 is a cross-sectional view thereof, and the vibration isolator 90 is disposed on the outer peripheral side at the upper end of the cylindrical body. An annular metal fitting 1 formed with a projecting flange portion 12, a center metal fitting 2 provided above the center line of the annular metal fitting 1 at a distance, and an annular metal fitting 1 and the center metal fitting 2 are disposed. A generally conical rubber member 3 for connecting the metal fittings 1 and 2 and a stopper metal 94 functioning as a stopper for restricting the relative displacement of the annular metal 1 and the center metal 3. A cylindrical portion 95 having a cylindrical shape, a stopper ring 96 protruding from the upper portion of the cylindrical portion 95 to the inner peripheral side, and bent at the lower end so as to wrap around the outer edge of the flange portion 12 and crimped to the flange portion 12. With the crimping part 97 fixed A plate-like portion 98 that continues from the lower end of the tubular portion 95 to the caulking portion 97 along the upper surface of the flange portion 12, and each of the caulking portion 97, the plate-like portion 98, and the lower portion of the tubular portion 95, A window portion 99 for draining is formed by cutting out a part in the direction.

  The vibration isolator 90 provided with such a stopper fitting 94 can limit the relative displacement of the annular fitting 1 and the center fitting 2 to be small, so that the durability of the rubber member 3 can be improved. Since the window part 99 is formed in the lower part of 94, it can prevent that rainwater etc. accumulate in the space between the rubber member 3 and the inner side of the stopper metal fitting 94. FIG.

Conventionally, the window portion 99 has both edges 89 formed in a straight surface from the cylindrical portion 97 to the crimping portion 96 via the plate-like portion 98, and this shape facilitates notch processing. It can be carried out.
International Patent Publication No. 03/001070 pamphlet (2003)

By the way, when the stopper metal 94 functions so that an upward force acts on the stopper metal 94 when the protruding portion 11 of the center metal fitting 2 hits the stopper ring 96, the plate-like part 98 cut out as the window part 99. The end surface 98a is subjected to a force for pulling it off from the flange portion 12, but in the prior art, the end surface 97a of the crimping portion 97 and the end surface 98a of the plate-like portion 98 are on the same plane. As a result, the end surface 97a of the caulking portion 97 is also turned up. As a result, the caulking portion 97 is gradually opened due to repetition of the stopper action, and the stopper fitting 94 cannot be functioned as a stopper.
Further, the strength of the flange portion 12 including the crimping portion 97 is strong because it is caulked over the entire length of the flange portion 12 at a position away from the window portion 99, and conversely, it is weak near the window portion 99. The flange portion 12 on the side of the window portion 99 is likely to warp, which sometimes makes it easier to turn up the end surface 97a of the crimping portion 97.

  The present invention has been made in view of such a problem, and provides a vibration isolator capable of ensuring the strength and durability of a caulking portion, which is a portion in which a stopper fitting having a window portion is caulked to a flange portion of an annular fitting. The purpose is to provide.

<1> is an annular bracket formed by forming an outer peripheral flange portion at the upper end of the cylindrical body, a center bracket provided above the center line of the annular bracket, and the annular A rubber member disposed between the metal fitting and the center metal fitting to connect the metal fittings, and a stopper metal fitting that functions as a stopper for restricting relative displacement of the annular metal fitting and the center metal fitting. A cylindrical portion having a substantially cylindrical shape, a stopper ring protruding from the upper portion of the cylindrical portion to the inner peripheral side, and bent at the lower end so as to wrap around the outer edge of the flange portion, and then caulked and fixed to the flange portion Each of the caulking part, the plate-like part, and the lower part of the cylindrical part, and a plate-like part continuing from the lower end of the cylindrical part to the caulking part along the upper surface of the flange part. Zhou In cut away toward a portion vibration damper by forming a window portion for drainage,
The circumferential angle between the center line and the plane passing through one point in the window at the position corresponding to the cylindrical part and the plane passing through the center line and the point on the edge of the window is On either side, the anti-vibration device is characterized in that the point on the edge of the window portion is small when the position corresponds to the cylindrical portion and the plate-like portion, and large when the position corresponds to the caulking portion.

  <2> in <1>, the difference between the circumferential angle at the plate-like portion and the circumferential angle at the caulking portion is that a chord having a length corresponding to the thickness of the caulking portion is arranged on the flange outer edge It is a vibration isolator characterized by being larger than the circumferential angle at the time.

  According to <1>, the circumference formed by the plane passing through the center line and one point in the window at the position corresponding to the cylindrical part, and the plane passing through the center line and the point on the edge of the window Since the corner is small on either side of the left and right edges when the point on the edge of the window is at a position corresponding to the cylindrical part and the plate-like part, it is large at a position corresponding to the caulking part. As will be described in detail later, at the circumferential position corresponding to the end face notched as the window portion of the crimping portion, the plate-like portion will continuously extend in the form of a plate toward the window portion, As a result, the deformation due to the force for turning up the plate-like portion is greatly reduced. As a result, the crimped portion can be prevented from being turned up and the durability can be improved.

  According to <2>, the difference between the circumferential angle at the plate-like portion and the circumferential angle at the caulking portion is obtained when a chord having a length corresponding to the thickness of the caulking portion is arranged at the flange outer edge. Because it is larger than the circumferential angle, it is possible to reliably prevent the influence of the end face notched as the window part of the plate-like part from being turned up and deformed to reach the notched end face of the crimped part. it can.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a perspective view showing a vibration isolator according to an embodiment of the present invention, and FIG. 4 is a sectional view thereof. The vibration isolator 10 includes an annular metal fitting 1 in which a flange portion 12 that protrudes to the outer peripheral side is formed at the upper end of the cylindrical body portion 11, and a center metal fitting 2 that is spaced above the center line of the annular metal fitting 1. And a generally conical rubber member 3 disposed between the annular metal fitting 1 and the center metal fitting 2 to connect the metal fittings 1 and 2, and a stopper for limiting the relative displacement of the annular metal fitting 2 and the center metal fitting 3. The stopper fitting 4 includes a functioning stopper fitting 4, the stopper fitting 4 having a substantially cylindrical shape, a stopper ring 6 protruding from the upper portion of the tubular portion 5 toward the inner peripheral side, and the flange portion 12 at the lower end. A caulking portion 7 which is bent so as to wrap around the outer edge of the flange portion 12 and is caulked and fixed to the flange portion 12; And the caulking part 7 Plate-like portion 8, and constructed by cutting out each of the circumferential portion of the cylindrical portion 5 lower to form a window portion 9 for drainage. Therefore, the edge of the window portion 9 extends over the crimping portion 7, the plate-like portion 8, and the cylindrical portion 5.

  The center metal fitting 2 is attached to, for example, an engine via a stud bolt 28 screwed into a female screw portion 2b provided therein, while the annular metal fitting 1 is attached to the vehicle body side via an attachment bolt 26. In this case, the vibration isolator 10 acts to suppress vibration transmitted from the engine to the vehicle body side.

  Further, the center metal fitting 2 is formed with a ridge 11 protruding in the outer peripheral direction. This is limited by the stopper ring 12 coming into contact with the first buffer rubber 13, and the member 18 is stopped against the displacement in the direction in which the annular metal fitting 1 and the center metal fitting 2 approach each other in the axial direction. The ring 12 is configured to be restricted by hitting it through the second shock absorbing rubber 14, and further, with respect to the radial displacement between the annular metal fitting 1 and the center metal fitting 2, the outer peripheral surface 2 a of the center metal fitting 2 The stopper ring 6 is configured to limit this by contacting the inner peripheral surface 6a via the second shock absorbing rubber 14, and by limiting the large displacement in this way, the durability of the vibration isolator can be improved. To enhance It can be.

  The annular metal fitting 1, the center metal fitting 2, and the rubber member 3 can be formed easily by injecting and molding a rubber material after the metal fittings 1 and 2 are previously set in a mold. In addition, it is preferable that the first buffer rubber 13 and the second buffer rubber 14 vulcanized and bonded to the stopper fitting 4 are molded integrally with the stopper fitting 4 in the same manner.

  FIG. 5 is a cross-sectional view showing a window corresponding to the arrow AA in FIG. 3, and the vibration isolator 10 is characterized by a center line O (that is, a center line of the annular metal fitting 1), and A circumference formed by a plane P0 passing through one point Q0 in the window 9 at a position corresponding to the cylindrical part 5, and a plane P1 and P2 passing through the center line O and points Q1 and Q2 on the edge of the window. The angles α1, α2, β1, β2 are small on both the left and right edges, α1, α2 at points Q1 and Q2 on the edge of the window corresponding to the cylindrical portion 5 and the plate-like portion 8, The points Q1 and Q2 on the edge of the window portion are set to be large as β1 and β2 at positions corresponding to the caulking portion 7, and α1 <β1 and α2 <β2 are established.

  The relationship between the circumferential angles defined above is that the end surface 5a of the cylindrical portion 5 (that is, the edge of the window portion at a position corresponding to the cylindrical portion 5) and the end surface 8a of the plate-shaped portion 8 (that is, the plate-shaped portion). 8) (the edge of the window portion at a position corresponding to 8) is directed toward the center of the window portion 9 rather than the end surface 7a of the crimping portion 7 (that is, the edge of the window portion corresponding to the crimping portion 7). The center metal fitting 2 and the annular metal fitting 1 are displaced relative to each other in the axial direction due to vibration, and the ridges 11 of the center metal fitting 2 indirectly contact the stopper ring 12. The force acting on the stopper metal 4 when turning off the plate-shaped portion 8 is turned up from the flange portion 12 at the position of the end surface 8a. The end surface 8a of the plate-shaped portion 8 is thus the end surface of the caulking portion 7. Since this is away from 7a, this turn-up is the end face 7 of the caulking part 7 The difference between the circumferential angles (β1−α1) and (β2−α2) is such that the chord 15 having a length corresponding to the thickness t of the caulking portion 7 is disposed on the outer edge of the flange portion. It is better to make it larger than the circumferential angle γ.

  However, if the difference between the circumferential angles is too large, the circumferential length in which the caulking portion 7 extends is shortened and the fixing force of the stopper fitting 4 to the annular fitting 1 is reduced. The angle differences (β1−α1) and (β2−α2) are preferably smaller than the circumferential angle (α1 + α2) of the window corresponding to the plate-like portion 8.

  Further, the annular metal fitting 1 below the rubber member 3 is provided with a partition member 23 attached in a liquid-tight manner on the inside thereof, and on the opposite side of the partition member 23 to the rubber member 3, a membrane member 25 that is flexibly deformed. Are disposed in the main liquid chamber 21 composed of a space surrounded by the rubber member 3 and the partition member 23, and the sub liquid chamber 21 composed of a space surrounded by the membrane member 25 and the partition member 23. The main liquid chamber 21 and the sub liquid chamber 22 are in communication with each other via an orifice 24 formed in the partition member 23, and the main liquid chamber is caused by the relative displacement in the axial direction between the annular metal fitting 1 and the center metal fitting 2. As the volume of the chamber 21 changes, the liquid moves through the orifice 23 that forms a narrow flow path, so that the effect of suppressing vibration can be exhibited.

  In the above description, the vibration isolator has been described with respect to the liquid-filled vibration isolator having the main liquid chamber 21 and the sub liquid chamber 22, but the present invention is not limited to this and does not have a liquid chamber. The present invention can also be applied to a device for vibration isolation only by the energy damping action of the rubber member.

  The vibration isolator according to the present invention can be used as an engine mount or body mount of an automobile.

It is a perspective view which shows the conventional vibration isolator. It is sectional drawing which shows the conventional vibration isolator. It is a perspective view which shows the vibration isolator of embodiment concerning this invention. It is sectional drawing which shows the vibration isolator of embodiment concerning this invention. It is sectional drawing which shows a window part corresponding to the AA arrow in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ring metal fitting 2 Center metal fitting 2a Outer peripheral surface of center metal fitting 2b Female thread part 3 Rubber member 4 Stopper metal fitting 5 Cylindrical part 5a End surface of cylindrical part 6 Stopper ring 6a Inner peripheral surface of stopper ring 7 Crimp part 7a End face of caulking part 8 Plate portion 8a End surface of plate portion 9 Window portion 11 Projection 12 Flange portion 13 First buffer rubber 14 Second buffer rubber 15 String 21 Main liquid chamber 22 Sub liquid chamber 23 Partition member 24 Orifice 25 Membrane member 26 Mounting bolt 28 A plane passing through the center line of the stud bolt P0 and a point in the window portion at a position corresponding to the cylindrical portion P1, P2 A plane passing through the center line and a point on the edge of the window portion Q0 In a position corresponding to the cylindrical portion Points in the window part Q1, Q2 Points on the edge of the window part

Claims (2)

An annular fitting formed with a flange portion projecting to the outer peripheral side at the upper end of the cylindrical body portion, a center fitting provided above the center line of the annular fitting at a distance, and the annular fitting and the center fitting And a rubber member that connects these metal fittings and a stopper metal that functions as a stopper that restricts the relative displacement of the annular metal fitting and the center metal fitting. The stopper metal fitting has a substantially cylindrical shape. A cylindrical part formed, a stopper ring protruding from the upper part of the cylindrical part toward the inner peripheral side, and a crimping part that is bent so as to wrap around the outer edge of the flange part at the lower end and is caulked and fixed to the flange part A plate-like portion that continues from the lower end of the tubular portion to the crimped portion along the upper surface of the flange portion, and a part in the circumferential direction of each of the crimped portion, the plate-like portion, and the lower portion of the tubular portion In the vibration damping device notched in by forming a window portion for drainage,
The circumferential angle between the center line and the plane passing through one point in the window at the position corresponding to the cylindrical part and the plane passing through the center line and the point on the edge of the window is On either side, the anti-vibration device is characterized in that the point on the edge of the window portion is small when the position corresponds to the cylindrical portion and the plate-like portion, and large when the point corresponds to the crimping portion.   The difference between the circumferential angle at the plate-like portion and the circumferential angle at the caulking portion is larger than the circumferential angle when a chord having a length corresponding to the thickness of the caulking portion is disposed on the flange outer edge. The vibration isolator according to claim 1.

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