JP5420382B2 - Torque rod - Google Patents

Description

  The present invention relates to a torque rod comprising a pair of brackets, a rod connecting both brackets, and a rubber bush accommodated in each bracket, and in particular, an outer cylinder is removed from a conventional general rubber bush. Thus, the weight of the torque rod can be reduced and the cost can be reduced, and a pair of elastic legs protruding from the elastic member fixed around the cylindrical member of the rubber bush in a V shape can be used as an intention from the bracket. The present invention relates to a torque rod from which the possibility of unplugging is sufficiently removed.

As a conventional bush type vibration isolator without an outer cylinder, there is one described in Patent Document 1.
This is a cylindrical member connected to one side of the support or the supported body, a bracket disposed on the outer peripheral side of the cylindrical member, and connected to the other side of the support or the supported body, and the cylindrical member And a pair of elastic legs made of a rubber elastic body extending in a V shape toward the bracket, and extending the ends of the elastic legs into the press-fit recesses formed in the brackets. It is formed by compressing and deforming with respect to the present direction.

  In this conventional device, each of the pair of elastic legs made of a rubber elastic body is directly press-fitted into the press-fitting recess of the bracket without applying an outer cylinder, thereby reducing the weight and cost of the device. It can be realized effectively.

JP 2003-74630 A

  However, in this conventional apparatus, the elastic legs are only compressed and deformed in the extending direction thereof, and each elastic leg is press-fitted and fixed to the press-fitting recess of the bracket. It is necessary to set a high compression rate in order to prevent unintentional withdrawal of the elastic legs, and it is necessary to set the compression rate high. There was a problem of lowering.

  The object of the present invention is to solve such problems of the prior art, and the object of the invention is to reduce the weight and cost of the torque rod based on the omission of the outer cylinder. In addition, without damaging the press-fit property of the elastic leg into the recess of the bracket, in other words, without setting the compression rate of the leg so high, and at the tip of the elastic leg, high hardness An object of the present invention is to provide a torque rod that can sufficiently prevent the elastic legs from coming out without embedding rubber or the like.

  The torque rod according to the present invention includes a pair of brackets, a rod member for connecting the brackets, and two kinds of large and small rubber bushes disposed in each bracket, and at least one of the large rubber bushes, for example, a metal The tip of the elastic leg that protrudes from the elastic member fixed around the highly rigid cylindrical member such as synthetic resin is press-fitted and fixed in the recess away from or near the center of the bracket. The elastic member around the cylindrical member of at least one of the rubber bushes is provided with one or more protrusions that can abut against the inner peripheral surface of the bracket and function as a stopper. The elastic member of the rubber bush is provided with a pair of elastic legs projecting in a V shape from the cylindrical member side, and each elastic leg is enlarged. In a state where each tip portion is compressed and deformed at least from the direction of the opposite elastic leg portion and is compressed and deformed toward the cylindrical member side, in other words, the center line (Y axis) of the rod member is the cylindrical member. In the orthogonal coordinate system consisting of the center line (Y axis) and the straight line (X axis) perpendicular to the center line (Y axis) at the center of the cylindrical member, In a state where each of the enlarged tip end portions is compressed and deformed in both the X-axis direction and the Y-axis direction, for example, it is press-fitted into each recess having a substantially “C” shape or a substantially “U” shape. It will be.

Furthermore, the torque rod of the present invention has at least two pairs of parallel surfaces in which each recess is located opposite to each other . Preferably, each of the two pairs of parallel surfaces extends in directions orthogonal to each other.

  By the way, the pair of elastic legs are preferably provided symmetrically with respect to the center line of the rod member, and preferably, the protruding form of the pair of elastic legs and the plurality of protrusions is a “large” shape. .

  And preferably, the compression rate in the direction toward the core member is set so that the compression rate from the direction of the opposite elastic leg of each enlarged leg of each elastic leg is in the range of 15 to 25%, for example 20%. The rate is in the range of 10-20 °, for example 15%.

  As described above, it is preferable to provide one or more positioning portions including concave portions, convex portions, and the like that are engaged with the brackets at the respective press-fitting tip portions of the respective elastic leg portions.

  In the torque rod of the present invention, in one or more rubber bushes, in particular, each enlarged tip of the pair of elastic legs of the elastic member is at least from the direction of the opposite elastic legs, that is, in the X-axis direction. In addition to being compressed and deformed, when pressing toward the core member side, that is, in a state where it is also compressed and deformed in the Y-axis direction, it is press-fitted into each recess provided in the bracket, and the elastic leg tip is pressed. By making the compression deformation direction of the two or more directions unnecessary, the application of the outer cylinder can be made unnecessary. Without damaging the press-fitting property into the dent, and without increasing the number of man-hours required for embedding high-hardness rubber, etc. Effectively prevent It is possible.

Further, in the torque rod of the present invention, each recess of the bracket has at least two pairs of parallel surfaces located opposite to each other, so that it is related to the initial shape of the enlarged tip portion of the elastic leg portion, etc. Under the above, it is possible to easily achieve the required compression rate of the above-described compressive deformation in each direction, which is the case when each of the two pairs of parallel surfaces is extended in a direction orthogonal to each other. More effective.

  When each of the pair of elastic legs is provided symmetrically with respect to the center line of the rod member, each elastic leg can contribute to the support of the input load sufficiently evenly, and each elastic leg The load supporting ability between the parts can be kept constant over a long period of time.

In addition, when the protruding form of the pair of elastic legs and the plurality of protrusions is a “large” shape, each protrusion excluding the elastic legs is sufficiently appropriate as a stopper for input in each direction. Can function.
That is, the left and right protrusions can function as a front-rear direction stopper, and the upward protrusion can function as a rebound stopper.
In addition, here, the base portions of the pair of elastic legs can be made to function as a rebound stopper in relation to the outline shape of the through hole portion of the bracket.

In the above description, the compression rate from the direction of the elastic leg on the opposite side of each distal end of each elastic leg is set in the range of 15 to 25%, for example 20%, and is directed to the core member side. When the compression rate in the direction is in the range of 10 to 20%, for example 15%, the compression rate in each direction is kept small, and the holding force of the elastic leg tip is sufficiently secured. In this way, it is possible to effectively prevent unexpected slipping out of the bracket.
That is, if the compression ratio exceeds the above range, it is difficult to press-fit the elastic leg portion, and the elastic leg portion is liable to be damaged such as a breakage. Occurs.
By the way, the reason why the compression ratio in each direction is changed is to make one of the larger numerical ranges the main direction of occurrence of pull-out drag. This is because it gets worse.

Further, when a positioning portion made up of one or more recesses, projections, etc. that engage with the bracket is provided at each press-fitting tip of each elastic leg, unintentional withdrawal of the elastic leg from the bracket is further reduced. It can be effectively prevented.
In addition, a recessed part can be used as a groove | channel etc. here, and a convex part can be used as a flange etc. which hooks on the hollow edge of a bracket other than a protrusion.

It is a perspective view which shows embodiment of this invention. It is a principal part enlarged front view of FIG. It is a disassembled perspective view which shows the assembly process of the principal part shown in FIG. It is a disassembled perspective view which shows the assembly example of the example of a change of an elastic leg part.

In FIG. 1 showing the torque rod of the present invention in a perspective view, reference numerals 1 and 2 each denote a pair of brackets, and reference numeral 3 denotes a rod member for connecting both brackets 1 and 2.
In addition, the illustrated torque rod is configured such that each of the rubber bushes 4 and 5 is accommodated in two types of brackets 1 and 2.

  Here, at least one of the rubber bushes, and in the figure, the large rubber bush 4 is vulcanized and adhesive bonded around the cylindrical member 6 as is apparent from FIG. The elastic member 7 is fixedly provided by, for example, a pair of elastic leg portions 8a and 8b protruding in a V shape from the cylindrical member 6 side toward the rod member 3 side. The elastic leg portions 8a and 8b are fixed to the bracket 1 by press-fitting the enlarged tip portions 9a and 9b into the recesses 10a and 10b formed in the bracket 1 and recessed away from the center of the bracket. To do.

Further, as shown in the drawing, the elastic member 7 is formed around the cylindrical member 6 and has one or more protrusions 11a and 11b in the drawing that can contact the inner peripheral surface of the bracket.
Here, the protrusion 11a is a rebound stopper provided so as to protrude from the center O of the cylindrical member 6 to the lower side opposite to the lower side of the drawing in which the elastic legs 8a and 8b protrude. The protruding portion 11b is a pair of front and rear stoppers that are provided so as to protrude from the center O of the cylindrical member 6 to the left and right sides of the drawing in which the respective elastic legs 8a and 8b protrude.

Here, the press-fitting and fixing of the enlarged tip portions 9a and 9b of the pair of elastic legs 8a and 8b into the recesses 10a and 10b having a substantially "C" shape or a substantially "U" shape is at least The tip portions 9a and 9b are compression-deformed from the direction of the elastic legs 8a and 8b on the opposite side, and are press-fitted into the recesses 10a and 10b in a two-way compression deformation state in which they are compressed and deformed toward the cylindrical member 6 side. To do.
This two-way compression deformation here is actually performed by receiving a compression force also from the opposite side of the two directions described above.
Here, the compressive deformation directions of the tip portions 9a and 9b can be a plurality of directions of three or more directions.

  The bi-directional compression deformation in the above case is, for example, an orthogonal coordinate in which the center line of the rod member 3 passing through the center O of the cylindrical member 6 is the Y axis, and a straight line perpendicular to the Y axis at the center O is the X axis. In the system, each of the enlarged tip portions 9a, 9b can be compressed and deformed in both the Y-axis direction and the X-axis direction.

Here, as shown in FIG. 2, each recess 10a, 10b of the bracket 1 preferably has two pairs of parallel surfaces positioned corresponding to each other. According to this, each enlarged tip portion Realization of the bi-directional compression deformation as described above accompanying the press-fitting of 9a and 9b into the recesses 10a and 10b can be simplified.
This is more effective when each of the two pairs of parallel surfaces is extended in directions orthogonal to each other as shown in the figure.

  Here, when the rubber bush 4 is pushed into the hollow portion 1a of the bracket 1 as shown in FIG. 3, the enlarged end portions 9a and 9b of the elastic legs 8a and 8b are inserted into the recesses 10a and 10b. In the case where there is not much difficulty in press-fitting, each of the recesses 10a and 10b can be provided with three or more parallel surfaces that contribute to the compressive deformation of the distal end portions 9a and 9, and one of the recesses 10a and 10b At the corners described above, the distal end portions 9a and 9b can be compressed and deformed.

  Preferably, each of the pair of elastic legs 8a, 8b is provided symmetrically with respect to the center line (Y axis) of the rod member 3, and the force in the direction of the center line, the force in the direction perpendicular to the center line, etc. By making the inputs to the respective elastic leg portions 8a and 8b substantially equal, the durability of the elastic leg portions 8a and 8b is improved.

By the way, when each of the protrusions of the pair of elastic legs 8a and 8b and the three protrusions 11a and 11b described above has a “large” shape as illustrated, as described above, The left and right protrusions can function as a front-rear direction stopper, and the upward protrusion can function as a rebound stopper.
In addition, as shown in the figure, the root portions of the pair of elastic legs can function as a rebound stopper in relation to the contour shape of the through hole portion of the bracket.

  In such a device, the compression rate in the X-axis direction from the direction of the opposite elastic leg portions 8a, 8b of the respective distal end portions 9a, 9b of the respective elastic leg portions 8a, 8b is in the range of 15 to 25%. Moreover, when the compression rate in the Y-axis direction facing the core member is in the range of 10 to 20%, excellent press-fitting properties can be ensured without causing damage to the elastic legs.

  The large rubber bush 4 as described above pushes the elastic member 7 fixed around the cylindrical member 6 into the hollow portion 1a of the bracket 1 from the side of the bracket 1 as shown in FIG. In this pushing operation, the enlarged end portions 9a and 9b of the pair of elastic legs 8a and 8b protruding in a V shape from the cylindrical member 6 side of the elastic member 7 are inserted into the recesses 10a and 10b of the bracket 1, respectively. The bracket 1 can be assembled by press-fitting while causing the compression deformation as described above.

  By the way, the small rubber bush 5 in the figure is configured by connecting the inner cylinder 5a and the outer cylinder 5b with an elastic member 5c, and press-fitting the rubber bush 5 to the inner peripheral side of the bracket 2. However, in addition to or instead of the large rubber bush 4, the small rubber bush 5 may have the same configuration as the large rubber bush 4 described above.

In the rubber bush 4 assembled in this way, in order to more effectively prevent the elastic member 7 from unintentionally coming out of the bracket 1, some engagement means is provided on the elastic member 7 and the bracket 1. Is preferred.
FIG. 4 is a modification of the elastic leg portion, an example of which is shown in the bottom perspective view of the rubber bush, which is provided at the enlarged end portions 9a and 9b of the elastic leg portions 8a and 8b in the recesses 10a and 10b. The flanges 13a and 13b are provided so as to engage the edges of the recesses 10a and 10b and the recesses 10a and 10b.

  Here, only one of the groove grooves 12a and 12b and the flanges 13a and 13b can be provided in the enlarged tip portions 9a and 9b, and the grooves 12a and 12b are provided in the tips 9a and 9b. Instead of or in addition, it is also possible to provide one or a plurality of protrusions that fit into the grooves provided in the recesses 10a and 10b.

DESCRIPTION OF SYMBOLS 1, 2 Bracket 1a Hollow part 3 Rod member 4, 5 Rubber bush 6 Cylindrical member 7 Elastic member 8a, 8b Elastic leg part 9a, 9b Enlarged front-end | tip part 10a, 10b Depression 11a, 11b Protrusion part 12a, 12b Strip 13a, 13b Flange O Center

Claims (6)

A pair of brackets, a rod member for connecting both brackets, and a rubber bush accommodated in each bracket are provided, and at least one of the rubber bushes is provided to protrude from an elastic member fixed around the cylindrical member. A torque rod in which the tip of the elastic leg is press-fitted and fixed in a recess away from the center of the bracket or in a direction approaching the center,
At least one of the rubber bushes is provided with one or more protrusions that can contact the inner peripheral surface of the bracket on the elastic member around the cylindrical member, and the elastic member of the rubber bush has a V-shape from the cylindrical member side. A pair of elastic leg portions projecting from each other, and at the same time, each enlarged leg tip portion is compressed and deformed at least from the direction of the opposite elastic leg portion and is compressed and deformed toward the cylindrical member side in press-fitted into each recess,
A torque rod , wherein each recess has at least two pairs of parallel surfaces facing each other . The torque rod according to claim 1 , wherein each of the two pairs of parallel surfaces extends in a direction orthogonal to each other. The torque rod according to claim 1 or 2 , wherein the pair of elastic legs are provided symmetrically with respect to the center line of the rod member. The torque rod according to any one of claims 1 to 3 , wherein the protruding form of the pair of elastic legs and the plurality of protrusions is a "large" shape. The compression rate from the direction of the opposite elastic leg of each enlarged leg end of each elastic leg is in the range of 15 to 25%, and the compression rate in the direction toward the cylindrical member is in the range of 10 to 20%. The torque rod according to any one of claims 1 to 4 . The torque rod according to any one of claims 1 to 5 , wherein each press-fitting tip portion of each elastic leg portion has one or more positioning portions engaged with the bracket.

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