JP4579780B2 - Cushion structure - Google Patents

Description

The present invention relates to an improvement of a cushion structure used to absorb an impact generated when a shock absorber is fully contracted.

  This type of cushion structure includes, for example, a bump stopper rubber provided on the rod side of the shock absorber and a bump stopper provided on the cylinder end, and the bump stopper rubber and the bump stopper when the shock absorber is fully contracted. The impact generated at the time of maximum contraction is absorbed while the bump stopper rubber is pressed and contracted.

Specifically, the structure of the cushion structure includes a cap portion that is press-fitted into the cylinder end, a plate portion with a rib that receives a bump stopper rubber superimposed on the cap portion, and a well-known bump stopper provided on the piston rod side. When the shock absorber having the cushion structure is used for a vehicle suspension or the like by adopting the above-described configuration, it is pushed up or vibrated while the vehicle is running. When the input is applied, the bump stopper rubber and the bump stopper cooperate to absorb the shock at the time of the compression of the shock absorber.
JP-A-9-317811 (prior art column, FIG. 5)

 However, the conventional cushion structure is not functionally defective, but improvement of the following problems is desired.

  When the bump stopper rubber collides with the bump stopper, the bump stopper rib contacts the end of the bump stopper rubber prior to the bump stopper rubber to help reduce the sound at the time of the collision. The silencing effect is not yet sufficient, and in particular, when this cushion structure is applied to a shock absorber for a vehicle, the occurrence of the above-mentioned collision sound causes discomfort to the vehicle occupant and increases the riding comfort in the vehicle. There is a risk of damage.

  Accordingly, the present invention has been developed to improve the above-described problems, and an object of the present invention is to provide a cushion structure that can alleviate the collision sound between the bump stopper and the bump stopper rubber. It is to be.

In order to achieve the above-described object, the problem-solving means of the present invention includes a cylindrical bump stopper rubber connected to a rod protruding and retracting from the inside of a cylinder, and a bump stopper provided at the end of the cylinder and facing the bump stopper rubber. In the cushion structure provided, a plurality of protrusions are provided at equal intervals along the circumferential direction at the end of the bump stopper rubber facing the bump stopper, and a plurality of protrusions are provided at the end of the bump stopper rubber facing the bump stopper rubber. Provided at equal intervals along the circumferential direction, and the number of bump stopper rubber side projections and the number of bump stopper side projections are set so as to have a prime relationship with each other when the bump stopper rubber and bump stopper are in contact with each other. also characterized in that is brought into contact with at least one of the bump stopper rubber side projections on one of the bump stopper side of the projection It is.

  According to the present invention, at the time of contact between the bump stopper rubber and the bump stopper, at least one of the bump stopper rubber protrusions first contacts at least one of the bump stopper protrusions. The occurrence of collision noise at the time of contact of the stopper is suppressed, and substantially all of the end of the bump stopper rubber and the end of the bump stopper are reduced while the impact is mitigated by elastic deformation of the bump stopper rubber-side protrusion that comes into contact first Therefore, the occurrence of a collision sound here is also suppressed.

In addition, since the generation of a collision sound when the bump stopper rubber and the bump stopper are in contact with each other is suppressed, when this cushion structure is applied to a shock absorber for a vehicle, the vehicle occupant feels uneasy or uncomfortable. In this way, the ride comfort in the vehicle can be improved.
Furthermore, when the shock absorber is applied to a strut type suspension, the rod may rotate in the circumferential direction with respect to the cylinder during steering, and the positional relationship between the bump stopper rubber protrusion and the bump stopper protrusion is the circumference. However, even if the bump stopper rubber is misaligned in the circumferential direction with respect to the bump stopper, be sure to One of the protrusions can be in contact with any one of the other protrusions, and it is possible to reliably suppress the generation of an impact sound when the bump stopper rubber and the bump stopper are in contact.
By setting in this way, it is not necessary to keep the positional relationship between the bump stopper rubber and the bump stopper precisely in the assembly process of the shock absorber, so the assembly of the shock absorber becomes very simple and the productivity is improved. It will be.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings. FIG. 1 is a partially enlarged cutaway side view of a shock absorber embodying a cushion structure according to an embodiment. FIG. 2 is a plan view of the bump stopper according to the embodiment. FIG. 3 is a cross-sectional view of a bump cushion rubber in one embodiment. FIG. 4 is a bottom view of the bump cushion rubber in the embodiment. FIG. 5 is a diagram in which bump bump protrusions in one embodiment are projected onto the end of the bump cushion rubber.

  Hereinafter, the present invention will be described with reference to the drawings. As shown in FIG. 1, the cushion structure according to the embodiment is applied to a shock absorber D and includes a bump stopper rubber 1 and a bump stopper 10.

  The bump stopper 10 is attached to the end portion of the cylinder 20 of the shock absorber D, and is opposed to the bump stopper rubber 1 provided on the tip end side of the rod 21 of the shock absorber D when the shock absorber D is most compressed. The impact generated in the shock absorber D in contact with the bump stopper rubber 1 is absorbed and reduced.

  Although not specifically shown, the shock absorber D is inserted into the cylinder 20, a piston (not shown) that is slidably inserted into the cylinder 20, and a piston that is connected to the piston and movably inserted into the cylinder. The rod 21 is configured so as to exhibit a predetermined damping action when the rod 21 moves in and out of the cylinder 20.

  As shown in FIGS. 1 and 2, the bump stopper 10 is formed in a bottomed cylindrical shape with synthetic resin or metal so that it can be fitted to the end of the cylinder 20, and at the center of the bottom 11 Is provided with an insertion hole 12 that allows the rod 21 to pass therethrough, and a plurality of protrusions 13 are provided at equal intervals in the circumferential direction at the upper end of the bottom 11 that is the end facing the bump stopper rubber 1. ing. That is, in this case, the bottom portion 11 becomes the annular end portion of the bump stopper 10. As shown in the figure, the protrusion 13 has a predetermined circumferential width W and is provided with three.

  On the other hand, as shown in FIGS. 1, 3 and 4, the bump stopper rubber 1 is formed in a cylindrical shape with synthetic resin, rubber, or the like, and has a plurality of outer peripheral side step portions 2 provided on the outer peripheral portion, and an inner peripheral portion. The lower end 5 which is provided with the outer peripheral side stepped portion 2 and the inner peripheral side stepped portion 3 which are alternately arranged in the axial direction and which is the end facing the bump stopper 10 is equidistant in the circumferential direction. A plurality of protrusions 4 are provided. And this protrusion 4 is provided with the predetermined circumferential direction width | variety H, and in the illustrated place, five are provided.

  The bump stopper rubber 1 and the bump stopper 10 configured as described above approach each other when the shock absorber D contracts, and as the contraction proceeds, the bump stopper rubber 1 and the bump stopper 10 eventually come into contact with each other due to elastic deformation of the bump stopper rubber 1. The shock at the time of the most contraction of the device D is absorbed and relaxed. At the time of the contact, as shown in FIG. 5, one of the protrusions 4 of the bump stopper rubber 1 is necessarily one of the protrusions 13 of the bump stopper 10. The protrusions 4 and 13 are arranged so as to contact each other.

  Specifically, depending on the relationship between the circumferential width H of the protrusion 4, the circumferential width W of the protrusion 13, and the number of the protrusion 4 and the protrusion 13, the bump stopper rubber 1 and the bump stopper 10 are brought into contact with each other. One of the protrusions 4 of the bump stopper rubber 1 is set so as to always contact one of the protrusions 13 of the bump stopper 10.

  That is, when the bump stopper rubber 1 and the bump stopper 10 are in contact with each other, at least one or more of the protrusions 4 of the bump stopper rubber 1 are first in contact with at least one or more of the protrusions 13 of the bump stopper 10. At least one or more of the protrusions 4 that first contact the protrusion 13 are elastically deformed, and thereafter the protrusion 13 and the portion where the protrusion 4 of the lower end 5 of the bump stopper rubber 1 is not provided, and the protrusion 4 and the portion of the bottom 11 of the bump stopper 10 where the protrusions 13 are not provided contact each other, and the compression force from the bump stopper 10 acts on almost the entire lower end of the bump stopper rubber 1 to be elastically deformed. .

  That is, since the bump stopper rubber 1 and the bump stopper 10 are in contact with each other first, the bump stopper rubber 1 and the bump stopper 10 are in contact with each other. The impact deformation is generated because the entire lower end 5 of the bump stopper rubber 1 and the entire bottom 11 of the bump stopper 10 are brought into contact with each other while the impact is reduced by the elastic deformation of the protrusions 4 that contact with each other. Will also be suppressed.

  Therefore, according to this cushion structure, since at least one of the plurality of protrusions 4 of the bump stopper rubber 1 is in contact with any one of the protrusions 13 of the bump stopper 10, as described above, the bump stopper rubber 1 and When the bump stopper 10 abuts, the generation of a collision sound is suppressed, and particularly when the cushion structure is applied to a vehicular shock absorber, there is no sense of anxiety or discomfort to the vehicle occupant, and the ride comfort in the vehicle. Can be improved.

  The bump stopper rubber 1 is fixed to the rod 21 of the shock absorber D, and the bump stopper 10 is fixed to the cylinder 20, so that the shock absorber D is applied to the strut type suspension when the shock absorber D is extended or contracted. In this case, the rod 21 may rotate around the circumferential direction with respect to the cylinder 20 during steering.

  As a result, the positional relationship between the protrusion 4 of the bump stopper rubber 1 and the protrusion 13 of the bump stopper 10 is shifted in the circumferential direction. Even if this deviation occurs, one of the protrusions 4 always contacts one of the protrusions 13. In order to make contact, in the present embodiment, as shown in FIG. 5, the number of protrusions 4 and the number of protrusions 13 are relatively prime, that is, the number of these protrusions 4. The greatest common divisor of the number of protrusions 13 is set to be 1.

  By setting the circumferential width H of the projection 4 and the circumferential width W of the projection 13 as appropriate, the bump stopper rubber 1 is displaced in the circumferential direction with respect to the bump stopper 10. Even if this occurs, one of the protrusions 4 can be surely brought into contact with any one of the protrusions 13, and the generation of impact sound when the bump stopper rubber 1 and the bump stopper 10 are in contact can be reliably suppressed.

  Further, by setting in this way, it is not necessary to maintain the positional relationship between the bump stopper rubber 1 and the bump stopper 10 in the assembly process of the shock absorber D, and the assembly of the shock absorber D is very simple. Productivity will be improved.

  In the above description, the case where the cushion structure is applied particularly to a vehicle shock absorber has been described. However, in addition to being applied to a vehicle shock absorber, a device provided with a rod and a cylinder. It is possible to apply this cushion structure to a place where it is necessary to relieve the impact at the time of the most compression, and even in such a case, the effect of the present invention is not lost.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is a partially expanded notched side view of the shock absorber which the cushion structure in one embodiment embodied. It is a top view of the bump stopper in one embodiment. It is sectional drawing of the bump cushion rubber in one Embodiment. It is a bottom view of the bump cushion rubber in one embodiment. It is the figure which projected the processus | protrusion of the bump stopper in one Embodiment on the edge part of bump cushion rubber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bump stopper rubber 2 Outer peripheral side step part 3 Inner peripheral side step part 4 Bump stopper rubber side protrusion 5 Lower end 10 as an end part Bump stopper 11 Bottom part 12 as an annular end part 13 Hole 13 Protrusion 20 Cylinder 21 Rod D Buffer

Claims (1)

End of the bump stopper rubber facing the bump stopper in a cushion structure comprising a cylindrical bump stopper rubber connected to a rod protruding from inside the cylinder and a bump stopper provided at the end of the cylinder and facing the bump stopper rubber A plurality of protrusions are provided at equal intervals along the circumferential direction, and a plurality of protrusions are provided at equal intervals along the circumferential direction at the end of the bump stopper facing the bump stopper rubber. The number of protrusions on the bump stopper side and the number of protrusions on the bump stopper side are set so as to have a prime relationship with each other, and at least one bump stopper rubber side protrusion is set to the bump stopper side protrusion when the bump stopper rubber and bump stopper contact each other. A cushion structure characterized by being brought into contact with one.

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