Hydraulic shock absorber for automobile

Abstract

The invention relates to a hydraulic shock absorber for an automobile, and belongs to the technical field of a shock absorber for an automobile. The hydraulic shock absorber comprises a first oil chamber (2) and a second oil chamber (6), wherein a piston body (4) makes reciprocating movement in a piston barrel (3), and a base (8) is arranged at the bottom of the piston barrel (3). The hydraulic shock absorber is characterized in that the piston barrel (3) forms a circulation passage through telescopic rods (5); a penetrating throttling pipe (9) is arranged at the middle of the base (8), one ends of the telescopic rods (5) are fixed to the piston body (4), and the other ends of the telescopic rods (5) penetrate through the base (8) along with the throttling pipe (9); and the circulation area of the circulation passage formed by the telescopic rods (5) is decreased along with increment of axial movement or/and circumferential direction rotation ranges of the piston body (4). In the hydraulic shock absorber for an automobile, the telescopic rods are arranged in the piston barrel, so that the circulation area of hydraulic oil at the base can be enlarged, the riding comfort degree is increased, besides, the buffering effect is achieved when the automobile is strongly shaken to roll, the damage of an automobile body is avoided, and the personal safety is guaranteed.

Description

technical field [0001] An automobile hydraulic shock absorber belongs to the technical field of automobile shock absorbers. Background technique [0002] Hydraulic shock absorption is a common shock absorption method in the automotive field. The shock absorber piston is generally arranged in the automobile shock absorber, and the piston rod and the shock absorber shell of the shock absorber piston are respectively installed on the body and the wheel assembly. When the car vibrates up and down during driving, the piston will The reciprocating motion in the piston cylinder acts as a shock absorber. Traditional hydraulic shock absorbers generally have the following defects: [0003] (1) In the prior art, the moving range of the piston rod in the automobile shock absorber is directly proportional to the degree of vibration of the car. When the car passes through a bumpy road at high speed during driving, the distance between the wheel and the body suddenly becomes smaller , F...

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Problems solved by technology

[0003] (1) In the prior art, the moving range of the piston rod in the automobile shock absorber is directly proportional to the degree of vibration of the car. When the car passes through a bumpy road at high speed during driving, the distance between the wheel and the body suddenly becomes smaller , For the people in the car, the direct feeling is that the car's shock absorber "hardens", which causes a greater sense of bumps, which causes discomfort to the passengers

[0004] Under the above circumstances, the reason for the "hardening" of the car's shock absorber is that the distance between the wheel and the body suddenly decreases, causing the piston to compress extremely rapidly. At this time, the piston rod will drive the piston to enter the interior of the piston barrel at a very fast speed, which was originally located under the piston. The oil in the oil chamber cannot flow through the flow hole on the piston to the oil chamber above the piston at the same speed, so the first stage of "damping force" is caused at the piston

In addition, when the piston rod enters the piston barrel, as the length of the piston rod gradually increases, the volume of the oil chamber occupied by the piston rod itself gradually increases. At this time, the oil with the same volume as the piston rod usually flows through the bottom valve. The rate at which the channel flows into the external oil chamber is much smaller than the rate at which the piston rod enters the piston barrel, thus forming a second section of damping force at the bottom valve at the bottom of the piston barrel. Due to the existence of the above two sections of "damping force", the car shock Occurrence of "hardening"

[0005] (2) In the prior art, the design of automotive hydraulic shock absorbers often only focuses on the buffering effect of the vehicle when the vehicle body vibrates, but often ignores another situation that the vehicle body and wheels tend to move relative to each other during driving. , that is, the vehicle's direction change, especially the body roll that occurs when the vehicle changes direction at high speed in an emergency

[0007] When the car changes direction in an emergency, the relative movement and rotation between the piston and the piston cylinder are proportional to the speed of the car's direction change. Therefore, when the car changes direction in an emergency, the distance between the body and the wheels increases rapidly in a short time. Therefore, in this case, the piston is still adjusted according to the inherent state, and rollover is easy to occur. Therefore, the rollover of the body due to the change of direction has a greater safety hazard, which will not only cause damage to the body but also directly cause casualties.

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