Shock absorber
AssigneeHitachi Automotive Systems, Ltd.
InventorShigeo Katayama
Life of this patent
Estimating the term…
Abstract
A shock absorber including a piston inserted into a cylinder (2) having a hydraulic oil sealed therein. An outer tube (3) is provided around the outer periphery of the cylinder to form a reservoir (4) therebetween. A bottomed circular cylindrical casing (25) is joined to a side surface portion of the outer tube, and a damping force control valve (27) is housed in the casing. The bottomed circular cylindrical casing has a bottom (25A) formed with a joint surface (25B) curved along the outer peripheral surface of the outer tube and a flat inner surface (25C). The casing is integrally formed by forging.
Claims4
A tube-type shock absorber comprising:
- a circular cylindrical cylinder part having a working fluid sealed therein;
- a piston movable in the cylinder part;
- a piston rod connected to the piston and extended to an outside of the cylinder part;
- a circular cylindrical casing joined to a side surface portion of the cylinder part;
- and
- a damping force generating device housed in the casing to generate a damping force by controlling a flow of hydraulic fluid induced by movement of the piston,
- wherein the casing is in a shape of a circular cylinder with a bottom, the bottom having an opening and an inner surface including a planar portion around the opening, the bottom having a joint surface that is joined to the cylinder part, the joint surface being curved along an outer peripheral surface of the cylinder part,
- wherein the bottom of the casing has the inner surface and the joint surface integrally formed by forging,
- wherein the damping force generating device is provided on the inner surface of the bottom of the casing,
- wherein a recess is formed on the inner surface of the bottom of the casing, the recess being concaved from the inner surface and extending to the opening in a radial direction, the recess being integrally formed with the bottom by forging, and
- wherein a flow path of the hydraulic fluid communicates between the damping force generating device and the opening by the recess.
Dependencies are inferred from the claim text.