JP2009079647A - Dynamic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic damper installed with a mass member to vibrate in the vertical direction via shearing deformation of a rubber elastic body capable of advantageously preventing interference with other members. <P>SOLUTION: This dynamic damper is provided with a mounting member 1 fixed to a vibrator S, the mass member 2 oppositely arranged with a prescribed distance with the mounting member 1 and the rubber elastic body 3 fixed to the mass member 2 and the mounting member 1 to integrally connect both the members 2 and 1 and to elastically support the mass member 2 on the mounting member 1. When inputting vibration, the mass member 2 is installed to vibrate in the vertical direction via the shearing deformation of the rubber elastic body 3. The mounting member 1 is provided with a stopper member 4 abutting on an upper surface of the rubber elastic body 3 to regulate displacement of the rubber elastic body 3 to an upper side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dynamic damper that is attached to a vibrating body such as a vehicle differential, a sub-frame, a suspension frame, an exhaust pipe, and the like and suppresses vibration generated in the vibrating body.

  In a vehicle, there are many vibrations that are generated in accordance with the operation of a mounted engine and devices, and it is desirable that they do not occur. Therefore, Patent Document 1 discloses a type of vibration isolator that suppresses these vibrations. And 2 are known. In general, the dynamic damper is configured such that a mass member (mass body) is elastically supported via a rubber elastic body (spring member) with respect to an attachment member fixed to the vibration body. When the vibrating body vibrates at a specific frequency, the mass member resonates with the vibrating body through the spring action of the rubber elastic body, whereby the vibration of the vibrating body can be attenuated and suppressed. The resonance frequency of the dynamic damper is basically determined by the mass of the mass member and the spring constant of the spring member, and is tuned according to the frequency of the vibration intended to be reduced.

  Incidentally, for example, a dynamic damper installed on a vibrating body such as a differential is mounted on the vibrating body S in a state where the mounting member 11 and the mass member 12 face each other in the horizontal direction, as shown in FIG. When vibration is input to the vibrating body S, the mass member 12 resonates so as to swing in the vertical direction through the shear deformation of the rubber elastic body 13 to suppress the vibration of the vibrating body S. When the dynamic damper is tuned so as to suppress vibrations in a low frequency range (about 30 Hz), the vibration width of the mass member 12 increases, so that it interferes with other members disposed in the vicinity. In order to avoid this, a sufficient vibration space of the mass member 12 is required.

However, in the vicinity of the differential, other members such as an exhaust pipe and a frame are usually arranged, and since there is a limit on the minimum ground clearance, the mounting position of the dynamic damper with respect to the differential is easily limited. Moreover, it may be difficult to ensure a sufficient vibration space for the mass member 12. In addition, Patent Document 2 discloses that the surface of the mass member 12 is covered with a rubber film, or that the rubber film is provided with a buffer protrusion, but when the mass member 12 interferes with another member, Since the hitting sound is generated and the vibration suppressing effect of the dynamic damper is reduced, it cannot be said that the interference prevention is satisfactory.
JP 2003-262252 A JP 2006-144998 A

  The present invention has been made in view of the above circumstances, and advantageously prevents interference with other members in a dynamic damper that is installed so that a mass member vibrates in the vertical direction through shear deformation of a rubber elastic body. It is a problem to be solved to provide a dynamic damper that can be used.

  The present invention that solves the above-described problems includes an attachment member that is fixed to a vibrating body, a mass member that is disposed opposite to the attachment member at a predetermined distance, and the mass member and the attachment member that are fixed to each other. A rubber elastic body that is integrally connected and elastically supports the mass member with respect to the mounting member, and the mass member mainly vibrates in the vertical direction through shear deformation of the rubber elastic body when vibration is input. In the dynamic damper thus installed, the mounting member is provided with a stopper member that abuts on one of the upper and lower surfaces of the rubber elastic body and restricts the displacement of the rubber elastic body to one side. It is characterized by being.

  The dynamic damper of the present invention is attached to the vibrating body by fixing the mounting member in a state of facing the mass member in the horizontal direction. When vibration is input to the vibrating body, shearing of the rubber elastic body is performed. Through the deformation, the mass member resonates so as to swing in the vertical direction. At this time, the rubber elastic body is controlled by the stopper member provided on the mounting member so as to be in contact with either one of the upper and lower surfaces thereof, so that the displacement to the one side in the vertical direction is restricted. The deflection width of the mass member toward one side is suppressed to be small. Thereby, interference with the other member and mass member which were arrange | positioned in the vicinity of one side is prevented effectively.

  The deflection width to one side of the mass member can be set to a desired deflection width by appropriately changing the position where the stopper member contacts the rubber elastic body in the direction in which the mounting member and the mass member face each other. Is possible.

  In the present invention, the stopper member is in contact with at least a part of the rubber elastic body mounting member and the mass member in the facing direction. In other words, the rubber elastic body mounting member and the mass member may be provided so as to be in contact with each other or in contact with all of the mass members. When the stopper member is provided so as to be in contact with the rubber elastic body mounting member and the mass member in the opposite direction, displacement of the rubber elastic body to one side is restricted over the entire surface. Thus, there is almost no deflection width to one side of the mass member.

  In addition, when the stopper member is provided so as to be in contact with a part in the direction in which the mounting member of the rubber elastic body and the mass member face each other, the edge portion of the stopper member closest to the mass member is rubber elastic. It becomes a fulcrum that regulates body displacement. Therefore, by appropriately setting the position of the edge on the mass member side of the stopper member, the deflection width toward the one side of the mass member can be set to a desired deflection width. In addition, as the position of the edge of the stopper member on the mass member side approaches the mass member, the deflection width toward the one side of the mass member becomes smaller. This stopper member is formed of a rigid body. For example, it can be formed by employing a metal or a rigid resin having rigidity.

  In the present invention, the rubber elastic body may adopt any shape such as a prismatic shape or a cylindrical shape. However, the rubber elastic body having a prismatic shape stabilizes the vibration (swing motion) direction of the mass member in the vertical direction. This is preferable. When a prismatic rubber elastic body is employed, the stopper member is provided so as to come into contact with either one of the upper and lower surfaces of the rubber elastic body. Further, when the cylindrical rubber elastic body is adopted, it is not necessary to make the stopper member abut over the entire circumferential direction of the upper semicircular arc surface or the lower semicircular arc surface of the rubber elastic body. . That is, you may make it contact | abut the flat part of a stopper member with respect to the circular-arc-shaped outer peripheral surface of a rubber elastic body.

  In the dynamic damper of the present invention, the mounting member is provided with a stopper member that abuts on one of the upper and lower surfaces of the rubber elastic body and regulates the displacement of the rubber elastic body to one side. Interference with the member can be advantageously prevented.

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

  FIG. 1 is a side view illustrating a mounting state of the dynamic damper according to the present embodiment, FIG. 2 is a plan view illustrating the mounting state of the dynamic damper, and FIG. 3 is a plan view of the dynamic damper according to the present embodiment. 4 is a front view of the dynamic damper, and FIG. 5 is a side view of the dynamic damper.

  As shown in FIGS. 3 to 5, the dynamic damper according to the present embodiment includes an attachment member 1 that is fixed to the vibrating body, a mass member 2 that is disposed to face the attachment member 1 at a predetermined distance, and a mass member 2. And a rubber elastic body 3 which is fixedly attached to the mounting member 1 and integrally connects both members and elastically supports the mass member 2 with respect to the mounting member 1.

  The mounting member 1 is formed in a predetermined shape by a metal plate, and mounting holes 1a and 1a through which mounting bolts (not shown) are inserted are provided at two locations in the vertical direction. The mass member 2 is formed in a trapezoidal block shape whose cross section is close to a rectangle by an iron-based metal, and has a predetermined mass. The rubber elastic body 3 is formed by vulcanizing and molding a rubber material into a prismatic shape. One end surface is vulcanized and bonded to the mounting member 1 and the other end surface is vulcanized to the mass member 2. It is glued.

  As shown in FIGS. 1 and 2, the dynamic damper has mounting holes 1 a, 1 a with the mounting holes 1 a, 1 a of the mounting member 1 positioned in the vertical direction with respect to the differential bracket as the vibrating body S. Are attached by two mounting bolts 1b and 1b. As a result, the mounting member 1 and the mass member 2 are mounted in a state of being opposed to each other in the horizontal direction. At the time of vibration input, the mass member 2 vibrates mainly in the vertical direction through shear deformation of the rubber elastic body 3 (oscillating). Exercise).

  A stopper member 4 having an L-shaped cross section is attached to the upper portion of the attachment member 1. The stopper member 4 includes a rectangular flat plate-shaped mounting substrate 4a and a rectangular flat plate-shaped contact base portion 4b bent at one end in the width direction of the mounting substrate 4a. It is formed thicker than. The stopper member 4 is attached to the bracket of the vibrating body S together with the attachment member 1 by one (upper side) attachment bolt 1b in a state where the attachment base 4a is superimposed on the attachment member 1. The lower surface of the contact base portion 4 b located below 4 a is in contact with the upper surface of the rubber elastic body 3.

  The contact base 4b is in contact with the entire region in the range B from the end on the mounting member 1 side to the center in the direction in which the mounting member 1 and the mass member 2 on the upper surface of the rubber elastic body 3 face each other. The edge on the mass member 2 side of the abutting base 4b is located at the approximate center in the direction in which the mounting member 1 and the mass member 2 face each other. As a result, the upper half of the upper surface of the rubber elastic body 3 on the mounting member 1 side is restricted from being displaced upward by the contact base 4b of the stopper member 4, so that the mass member 2 is moved upward. Vibration (swinging motion) is suppressed to approximately ½. Note that the length in the longitudinal direction of the abutting base portion 4 b is slightly longer than the length in the width direction of the rubber elastic body 3.

  As described above, in the dynamic damper of the present embodiment installed on the vibrating body S, when vibration is input to the vibrating body S, the mass member 2 swings up and down through shear deformation of the rubber elastic body 3. Resonates like At this time, the elastic elastic body 3 is restrained from being displaced upward by the stopper member 4 provided on the mounting member 1 so as to be in contact with the upper surface thereof, so that the mass member 2 upwards The deflection width is suppressed to be approximately half (0.5 A) of the deflection width (A) when the stopper member 4 is not provided (see FIG. 1). Thereby, interference with the mass member 2 and the other member arrange | positioned in the vicinity of the upper side is prevented effectively. When the mass member 2 swings downward, the downward deflection of the mass member 2 is about 1.5 times the deflection width (A) when the stopper member 4 is not provided (1.5 A). ) And the total runout width in the vertical direction is approximately 2A, which is substantially the same as when the stopper member 4 is not provided.

  FIG. 6 shows a load-deflection characteristic when the dynamic damper according to the present embodiment resonates and resonates, and a conventional dynamic damper not provided with the stopper member 4 shown in FIG. The load-deflection characteristics when resonating are shown. In this case, the dynamic spring constant kd in the present embodiment and the conventional dynamic spring constant kd are substantially the same.

  As described above, in the dynamic damper of this embodiment, the mounting member 1 is provided with the stopper member 4 that abuts on the upper surface of the rubber elastic body 3 and restricts the displacement of the rubber elastic body 3 to one side (upper side). Therefore, interference with other members can be advantageously prevented.

  In the present embodiment, the stopper member 4 is brought into contact with the upper surface of the rubber elastic body 3 to prevent interference with other members when the mass member 2 vibrates upward. In order to prevent interference with other members when the mass member 2 vibrates downward, the stopper member 4 may be provided in contact with the lower surface of the rubber elastic body 3.

It is a side view which shows the attachment state of the dynamic damper which concerns on embodiment of this invention. It is a top view which shows the attachment state of the dynamic damper which concerns on embodiment of this invention. It is a top view of the dynamic damper concerning the embodiment of the present invention. It is a front view of the dynamic damper concerning the embodiment of the present invention. It is a side view of a dynamic damper concerning an embodiment of the present invention. It is a graph which shows the load-deflection characteristic of the dynamic damper of embodiment, and the conventional dynamic damper. It is a side view which shows the attachment state of the conventional dynamic damper.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1, 11 ... Mounting member 1a ... Mounting hole 1b ... Mounting bolt 2, 12 ... Mass member 3, 13 ... Rubber elastic body 4 ... Stopper member 4a ... Mounting board 4b ... Contact base S ... Vibrating body

Claims (3)

An attachment member fixed to the vibrating body, a mass member disposed opposite to the attachment member at a predetermined distance, and fixed to the mass member and the attachment member so that both members are integrally connected to the attachment member. In a dynamic damper provided with a rubber elastic body that elastically supports the mass member, and installed so that the mass member mainly vibrates in the vertical direction through shear deformation of the rubber elastic body at the time of vibration input,
A dynamic damper, wherein the mounting member is provided with a stopper member that abuts on one of upper and lower surfaces of the rubber elastic body and restricts displacement of the rubber elastic body to one side.   The dynamic damper according to claim 1, wherein the stopper member is provided so as to come into contact with the rubber elastic body formed in a prismatic shape on a surface.   The dynamic damper according to claim 1, wherein the stopper member is in contact with at least a part of the rubber elastic body in a direction in which the mounting member and the mass member face each other.