JPH0443406Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of an automobile bumper shock absorbing device, and more specifically, the present invention relates to an improvement of an automobile bumper shock absorbing device, and more specifically, it is provided between the automobile frame and the bumper to sufficiently absorb shock. The purpose of this is to prevent damage to the vehicle body and at the same time ensure the safety of passengers.

(Prior Art) It is already known that a shock absorbing device is interposed between the frame and bumper of an automobile. For example, a coil spring is elastically fitted into a pair of cylinders that expand and contract with each other. Attempts have been made to date to interpose a rubber or synthetic resin elastic body with a honeycomb structure between the frame and the bumper.

(Problems to be solved by the invention) However, in all of the shock absorbing devices of the conventional structure described above, the elastic force of the spring or other elastic body for shock absorption is simple, so the impact force transmitted to the vehicle body is large. As a result, it was insufficient as a shock absorbing device, often damaging the vehicle body or injuring the occupants.

(Means for Solving the Problems) Therefore, the present invention was devised after various studies to solve the problems of the prior art mentioned above.
Specifically, a first cylinder whose openings are in sliding contact with each other in opposing abutment directions to form a telescopic cylinder, and a second cylinder which is fitted and slid into contact with the inner or outer circumference of the first cylinder. The first cylindrical body has an annular protrusion protruding toward the inner circumferential side of the intermediate portion thereof, and a longitudinal portion of the first cylindrical body between the annular protrusion and the inner bottom portion. A valve body that can freely slide along the valve body is inserted, and a first biasing means for biasing outward is interposed between the valve body and the inner bottom part, and a second A second biasing means is interposed between the cylinder and the annular protrusion of the first cylinder, and acts in a direction to separate the cylinders from each other, The present invention relates to an automobile bumper shock absorbing device in which a connecting rod is interposed between the bottom portion and a valve body within a first cylindrical body.

(Embodiment) The specific content of the present invention will be explained below based on an illustrated embodiment. 1 is a first cylindrical body;
indicates a second cylindrical body, and the openings are brought into sliding contact with each other in the opposing abutment directions to form a telescopic cylindrical body.

The first cylindrical body 1 has a bottom 2 that closes one side, and has an annular protrusion 3 that protrudes toward the inner circumferential side of the intermediate part, and furthermore, the annular protrusion 3 and the inner deep part on the bottom 2 side are connected to each other. A valve body 5 having a through hole 6 which can freely slide along the length direction of the first cylindrical body 1 and a check valve 7 which closes the through hole 6 only in one direction.
is fitted therein, and a first biasing means 4 that exerts an outward biasing force is interposed between the valve body 5 and the inner deep bottom portion 2.

The second cylindrical body 8 has a bottom 9 that closes one side and has a small hole 8a at a position near the bottom.
The annular protrusion 3 of the first cylindrical body 1 is slidably fitted in and out of the inner circumferential side or the outer circumferential side of the first cylindrical body 1.
A second biasing means 10 is interposed between the cylindrical bodies 1 and 8 to act in a direction to separate the cylindrical bodies 1 and 8 from each other.

Further, a connecting rod 11 is integrally interposed between the inner bottom part 9 of the second cylindrical body 8 and the valve body 5 in the first cylindrical body 1. The extension distance of the second cylindrical body 8 is maintained constant, and the impact force of the second cylindrical body 8 upon receiving an impact is directly transmitted to the valve body 5 via the connecting rod 11.

In the structure of the above embodiment, if the biasing force of the first biasing means 4 is made larger than the biasing force of the second biasing means 10, the impact resistance stress can be set in two stages, and the Since the urging force of the second urging means 10 can be made softer, the shock absorption effect can be further improved.

(Function) In the configuration of the above-described embodiment, when at least two cylinders are attached between the frame 12 and the bumper 13 of the automobile, when the bumper 13 receives impact stress due to a collision or the like, the second cylinder body 8 resists the biasing force of the second biasing means 10 and
move in the direction of the cylindrical body 1. At this time, the air inside the second cylindrical body 2 escapes to the outside through the small hole 8a.

On the other hand, the connecting rod 11 integrated with the second cylindrical body 8 moves the valve body 5 a certain distance toward the inner bottom 2 of the first valve body 1, and then comes into contact with the first biasing means 4. It moves further toward the bottom 2 of the cylinder 1 against the biasing force. At that time, the air pressure between the valve body 5 and the inner bottom of the first cylindrical body 1 increases significantly, and due to the check valve 7, the air pressure does not pass through the through hole 6, but only in the loose sealing material around it. In order to keep the air from escaping gradually, the shock absorption capacity is doubled by the air compression action.

Further, after the pressing force due to the impact of the bumper 13 reaches its limit, the valve body 5 is pushed back a certain distance by the first urging means 4, and then returned to its original position by the second urging means 10. In this case, since the check valve 7 is opened, air passes through the valve body 5 through the through hole 6 and sufficiently enters between the valve body 5 and the inner bottom of the first cylindrical body 1. The return power is extremely rapid.

(Effect of the invention) Since the present invention has the above-described configuration, the impact force applied to the bumper of the automobile is primarily absorbed by the second biasing means and the first valve body.
If the absorption is not fully absorbed by this, the first biasing means interposed between the valve body and the innermost part of the first cylinder body. By absorbing the impact even more strongly, the remaining impact force is secondarily completely absorbed, thereby preventing the impact from being transmitted to the frame as much as possible. Damage and crew safety can be further ensured.

In the case of the embodiment described above, the above-mentioned safety effect can be further improved by making the urging force of the first urging means stronger than that of the second urging means.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional plan view of an automobile bumper impact absorbing device representing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... First cylindrical body, 2... Bottom, 3... Annular protrusion, 4... First biasing means, 5... Valve body, 6...
...Through hole, 7...Check valve, 8...Second cylindrical body, 9...
...bottom, 10...second biasing means, 11...connection rod.

Claims (1)

[Scope of utility model registration request] Consisting of a first cylindrical body whose openings are in sliding contact with each other in opposing abutment directions to form a telescopic cylindrical body, and a second cylindrical body that fits and slides into the inner circumference or outer circumference side of the first cylinder, The first cylindrical body has an annular protrusion protruding toward the inner peripheral side of the intermediate portion thereof, and the first cylindrical body has an annular protrusion that slides along the length direction of the first cylindrical body between the annular protrusion and the inner bottom part. A movable valve body is inserted, and a first biasing means for biasing outward is interposed between the valve body and the inner deep part, and the second cylindrical body is provided with the above-mentioned biasing means. A second biasing means that acts in a direction to separate both cylinders from each other is interposed between the annular protrusion of the first cylinder and the inner bottom part of the second cylinder and the first cylinder. An automobile bumper shock absorbing device consisting of a connecting rod interposed between a valve body inside the body.