Rebound stopper

The present invention relates to a rebound stopper.

Conventionally, a rebound stopper is provided on an automobile suspension or the like in order to absorb an impact when the vehicle body floats in the air. As such a rebound stopper, a urethane-made substantially cylindrical one is known (see Patent Documents 1 and 2). A rebound stopper according to such a conventional example will be described with reference to FIG. 7. FIG. 7 is a schematic cross-sectional view showing a mounted state of the rebound stopper according to the conventional example.

The rebound stopper 500 is arranged so that one end side end surface 501 abuts on the rebound sheet 210 provided on the rod 200, and when the rod 200 extends beyond a certain level, the other end side end surface 502 is provided on the inner circumference of the cylinder 300. It is configured to collide with the rod guide 310. Then, when the other end surface 502 of the rebound stopper 500 collides with the rod guide 310, the rebound stopper 500 is sandwiched between the rebound sheet 210 and the rod guide 310 and compressed to absorb the impact.

However, the urethane rebound stopper 500 has a relatively high hardness, and the initial compression amount (deflection amount) at the time of collision is small, so that there is a problem that the collision sound becomes loud.

<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2004-225744</text></patcit><patcit num="2"><text>JP-A-2002-39252</text></patcit></p>

<p> An object of the present invention is to provide a rebound stopper for reducing collision noise.</p>

<p> The present invention employs the following means to solve the above problems.</p><p> That is, the rebound stopper of the present invention is It is mounted on the outer circumference of a rod provided so as to be reciprocating in the cylinder, and one end surface faces the rebound sheet provided on the rod, and the other end surface is provided on the inner circumference of the cylinder. Arranged so as to face the collided member, When the rod moves in the direction of the rebound sheet toward the collided member, the other end surface collides with the collided member and is compressed by the rebound sheet and the collided member to cause an impact. In a substantially cylindrical urethane rebound stopper that absorbs The rebound stopper body is characterized in that a plurality of through holes penetrating from the inside to the outside of the cylinder are formed.</p><p> According to the present invention, since a plurality of through holes are formed in the rebound stopper main body, when the rebound stopper is compressed by the rebound sheet and the collided member, it is easily deformed in the compression direction. Therefore, the amount of compression (deflection) of the initial rebound stopper at the time of collision It can be increased and the collision noise can be reduced.</p><p> A plurality of annular grooves are formed on the outer peripheral side of the rebound stopper body at intervals in the extending direction of the rod. The plurality of through holes may be formed at the bottom of these annular grooves.</p><p> In this way, the rebound stopper is more effectively compressed by the synergistic effect of forming a plurality of annular grooves on the outer peripheral side of the rebound stopper body and forming a through hole at the groove bottom of the annular groove. It can be made easier.</p>

<p> As described above, according to the present invention, the impact sound can be reduced.</p>

<figref num="1">FIG. 1 is a perspective view of the rebound stopper according to the first embodiment of the present invention.</figref><figref num="2">FIG. 2 is a schematic cross-sectional view of the rebound stopper according to the first embodiment of the present invention.</figref><figref num="3">FIG. 3 is a schematic cross-sectional view of the rebound stopper according to the first embodiment of the present invention.</figref><figref num="4">FIG. 4 is a schematic cross-sectional view of the rebound stopper according to the first embodiment of the present invention.</figref><figref num="5">FIG. 5 is a schematic cross-sectional view showing a mounted state of the rebound stopper according to the first embodiment of the present invention.</figref><figref num="6">FIG. 6 is a perspective view of the rebound stopper according to the second embodiment of the present invention.</figref><figref num="7">FIG. 7 is a schematic cross-sectional view showing a mounted state of the rebound stopper according to the conventional example.</figref>

Hereinafter, embodiments for carrying out the present invention will be described in detail exemplarily based on examples with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in this embodiment are not intended to limit the scope of the present invention to those, unless otherwise specified. ..

(Example 1) The rebound stopper according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. 1 is a perspective view of the rebound stopper according to the present embodiment, FIGS. 2 to 4 are cross-sectional views of the rebound stopper according to the present embodiment, and FIG. 5 is a mounted state of the rebound stopper according to the present embodiment. It is a schematic cross-sectional view which shows. Here, FIG. 2 is a cross-sectional view of the rebound stopper cut so as to pass through the central axis and a position where the through hole 120 described later is not provided, and the rebound stopper is cut at the position of BB in FIG. Equivalent to. FIG. 3 is a cross-sectional view of the rebound stopper cut perpendicular to the central axis and passing through the position where the through hole 120 is provided, and corresponds to the one cut at the position AA in FIG. FIG. 4 is a cross-sectional view of the rebound stopper cut so as to pass through the central axis and the position where the through hole 120 is provided, and corresponds to the one cut at the CC position in FIG. The rebound stopper 100 in FIG. 5 corresponds to the one shown in FIG.

&lt;Structure of rebound stopper&gt; In particular, the configuration of the rebound stopper according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

The rebound stopper 100 according to this embodiment is used for a suspension of an automobile or the like. That is, as shown in FIG. 5, the rebound stopper 100 is a rod (piston rod) provided so as to be reciprocating in the cylinder 300 constituting the suspension. It is mounted on the outer circumference of 200. Further, the rebound stopper 100 is provided on the rod guide 310 as a collided member having one end side end surface 101 facing the rebound seat 210 provided on the rod 200 and the other end side end surface 102 provided on the inner circumference of the cylinder 300. Arranged so as to face each other. The rod guide 310 functions as a bearing for the rod 200.

In the normal state, the end surface 101 on one end side of the rebound stopper 100 is in contact with the rebound sheet 210, and there is a gap between the end surface 102 on the other end side and the rod guide 310. Then, when the vehicle body floats in the air, the rod 200 moves upward in FIG. That is, the rod 200 moves in the direction in which the rebound seat 210 faces the rod guide 310. Then, when the movement amount of the rod 200 exceeds a certain value, the other end surface 102 of the rebound stopper 100 collides with the rod guide 310. As a result, the rebound stopper 100 is compressed by the rebound seat 210 and the rod guide 310 to absorb the impact.

As the material of the rebound stopper 100, urethane, which is a material having relatively high rigidity and excellent durability, is used. Further, the rebound stopper 100 is composed of a substantially cylindrical member, and the rod 200 is inserted into the cylinder.

A plurality of (four in this embodiment) annular grooves 110 are formed on the outer peripheral side of the rebound stopper 100 at intervals in the extending direction (that is, the axial direction) of the rod 200, and the overall shape is formed. Is configured to have a bellows shape.

Further, a plurality of through holes 120 penetrating from the inside to the outside of the cylinder are formed in the groove bottoms of the plurality of annular grooves 110. In this embodiment, through holes 120 are formed at four locations for each of the four annular grooves 110. These four through holes 120 are provided at 90 ° intervals in the circumferential direction. Then, in this embodiment, the four through holes 120 provided in the four annular grooves 110 are arranged at the same positions in the circumferential direction with respect to each of the annular grooves 110. .. Therefore, as is clear from each figure, the plurality of through holes 120 are arranged in a total of four rows so as to be linearly arranged in the extending direction (that is, the axial direction) of the rod 200.

&lt;Advantages of the rebound stopper according to this embodiment&gt; As described above, according to the rebound stopper 100 according to the present embodiment, since a plurality of through holes 120 are formed in the rebound stopper main body, when the rebound stopper 100 is compressed by the rebound sheet 210 and the rod guide 310. , It becomes easy to be deformed in the compression direction. Therefore, the amount of compression (deflection) of the initial rebound stopper 100 at the time of collision can be increased, and the collision noise can be reduced.

Then, in this embodiment, the rebound is caused by the synergistic effect of forming a plurality of annular grooves 110 on the outer peripheral side of the rebound stopper main body and forming through holes 120 at the groove bottoms of these annular grooves 110. The stopper 100 can be more effectively and easily compressed. Therefore, the collision sound can be effectively suppressed.

Further, in this embodiment, a configuration is adopted in which the end surface 101 on one end side of the rebound stopper 100 abuts on the rebound sheet 210 and the end surface 102 on the other end side of the rebound stopper 100 collides with the rod guide 310. Therefore, when the rebound stopper 100 is compressed by the rebound seat 210 and the rod guide 310, stress does not concentrate on a specific part of the rebound stopper 100, and damage at the time of collision can be suppressed. it can.

(Example 2) FIG. 6 shows Example 2 of the present invention. In the first embodiment, the through holes provided in each annular groove are arranged at the same position in the circumferential direction with respect to any annular groove, but in this embodiment, adjacent annular grooves are provided. The case where a plurality of through holes provided in the grooves are arranged at positions shifted with respect to the circumferential direction is shown. Since the configuration and operation other than the arrangement position of the through hole are the same as those in the first embodiment, the description thereof will be omitted as appropriate.

Also in the rebound stopper 100a according to the present embodiment, a plurality of (four in this embodiment) annular grooves are formed on the outer peripheral side thereof at intervals in the extending direction (that is, the axial direction) of the rod. The overall shape is configured to be bellows. Hereinafter, for convenience of explanation, these annular grooves will be referred to as a first annular groove 111, a second annular groove 112, a third annular groove 113, and a fourth annular groove 114.

Through holes 121, 122, 123, 124 are provided at four locations in the first annular groove 111, the second annular groove 112, the third annular groove 113, and the fourth annular groove 114, respectively. The four through holes 121, 122, 123, 124 provided in each annular groove are all provided at 90 ° intervals in the circumferential direction.

The four through holes 121 provided in the first annular groove 111 and the four through holes 122 provided in the second annular groove 112 are arranged so as to be displaced by 45 ° with respect to the circumferential direction. is there. Further, the four through holes 121 provided in the first annular groove 111 and the four through holes 123 provided in the third annular groove 113 are at the same positions with respect to the circumferential direction. Further, the four through holes 121 provided in the first annular groove 111 and the four through holes 124 provided in the fourth annular groove 114 are arranged so as to be displaced by 45 ° with respect to the circumferential direction. is there.

As described above, in the rebound stopper 100a according to the present embodiment, a plurality of through holes provided in the adjacent annular grooves are arranged so as to be displaced with respect to the circumferential direction.

Even with the rebound stopper 100a configured as described above, the same effect as that of the rebound stopper 100 according to the first embodiment can be obtained. Further, in the case of the present embodiment, as compared with the case of the first embodiment, the portions where the through holes are arranged are more dispersed in the circumferential direction, so that the rebound stopper 100a is compressed and deformed. Can be made more uniform with respect to the circumferential direction.

&lt;Others&gt; The number and arrangement positions of the annular grooves and through holes provided in the rebound stopper are not limited to those shown in the above embodiments. That is, the number and arrangement positions of the annular groove and the through hole may be appropriately set according to the usage environment in relation to the durability. Further, in each of the above embodiments, the case where the through hole is provided in the groove bottom of the annular groove is shown so that the rebound stopper is effectively compressed, but even if the through hole is provided in a portion other than the annular groove, the compression is performed. You can improve your sex. Further, even if the rebound stopper does not have an annular groove, the compressibility can be improved by providing a plurality of through holes.

100,100a rebound stopper 101 One end side end face 102 End face on the other end 110 annular groove 111 1st ring groove 112 Second ring groove 113 Third annular groove 114 4th ring groove 120,121,122,123,124 Through hole 200 rod 210 rebound seat 300 cylinder 310 rod guide