Vehicle shock absorber
AssigneeHonda Motor Co., Ltd.
InventorMikio Uchiyama
Life of this patent
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Abstract
A vehicle shock absorber includes a plurality of communication holes axially provided side by side in a peripheral wall of the cylinder of the damper, another communication hole provided in a peripheral wall of the cylinder and located below a position of piston of the damper, and a third oil chamber provided in an outer tube and an inner tube of a fork body and outside the cylinder and communicating with only a second oil chamber via the communication holes. This configuration enables the vehicle shock absorber to make a damping force generated by the damper positional dependent, and suppresses the entering of an air bubble into the cylinder, even when a cylinder of the damper is located above an oil level in an oil reservoir within the absorber body.
Claims18
A vehicle shock absorber comprising:
- a vehicle body side tube and an vehicle axle side tube forming a telescopic shock absorber;
- a cylinder which is provided in one of the vehicle body side tube and the vehicle axle side tube and one end thereof is attached to a bottom of the one of the tubes and axially extends, and
- a cap is mounted on the other end thereof;
- a rod which is provided in the other one of the vehicle body side tube and the vehicle axle side tube and one end thereof is attached to a bottom of the other tube and axially extends, and the other end slidably penetrates through the cap of the cylinder into the cylinder;
- a piston which is attached to the other end of the rod and slides in the cylinder with a contraction and elongation of a shock absorber body to generate a damping force by a flow resistance of oil in the cylinder;
- a suspension spring which energizes a spring holder fixed on the cylinder in an elongation direction of the shock absorber body;
- a first oil chamber which is formed outside the cylinder and acts as an oil reservoir in the shock absorber body;
- and
- a second oil chamber which is formed inside the cylinder,
- wherein the vehicle shock absorber further includes:
- a plurality of first oil communication holes axially provided side by side in a peripheral wall of the cylinder;
- a second oil communication hole;
- and
- a third oil chamber provided outside the cylinder and communicating with the second oil chamber via the plurality of first oil communication holes and the second communication hole, and
- wherein the plurality of first oil communication holes are sequentially closed according to a moving position of the piston in the cylinder during a contraction action of the shock absorber body and thereby a flow volume of a working oil from the cylinder gradually decreases;
- and
- wherein the vehicle shock absorber has a tubular member which is fixed to an outer circumference of the cylinder to form a double tube structure and a space between an inner circumference of the tubular member and the outer circumference of the cylinder is the third oil chamber.
Dependencies are inferred from the claim text.