Patent application number | Description | Published |
20090242341 | Fluid pressure shock absorber - An object of the present invention is to improve productivity by making manufacturing of a piston easier. A piston | 10-01-2009 |
20090294232 | SHOCK ABSORBER - A hydraulic shock absorber has a cylinder having a hydraulic fluid sealed therein and a piston connected with a piston rod and slidably provided in the cylinder. The piston is provided with a circular main seat portion to form a main valve chamber communicating with an extension passage. Arcuate sub-seat portions are provided in concentric relation to the main seat portion to form sub-valve chambers. A disk valve is seated on the main and sub-seat portions to form clearances between them that always communicate between the main and sub-valve chambers. The disk valve opens upon receiving the pressure in the main and sub-valve chambers. The clearances restrict the flow of hydraulic fluid flowing out through the sub-valve chambers at the beginning of opening of the disk valve to prevent a sharp change in damping force. The concentric arrangement of the main and sub-seat portions facilitates the setting of an initial deflection for the disk valve. | 12-03-2009 |
20110209957 | SHOCK ABSORBER - A piston coupled with a piston rod is inserted in a cylinder sealingly containing operating fluid. A substantially circular outer seat, an inner seat, disk support portions, an intermediate seat are provided on the lower end surface of the piston. The disk support portions are disposed between the outer seat and the inner seat. The intermediate seat is disposed between the disk support portions and the outer seat. The protruding height of the disk support portion is shorter than the protruding height of the outer seat, and equal to or taller than the protruding height of the inner seat. The protruding height of the intermediate seat is shorter than the protruding height of the outer seat, and equal to or taller than the protruding height of the disk support portions. A disk valve, which is constituted by a large-diameter disk, a first intermediate-diameter disk, a second intermediate-diameter disk, and a small-diameter disk, is seated on the outer seat, the inner seat, disk support portions, and the intermediate seat. Then, the disk valve | 09-01-2011 |
20130025446 | CYLINDER APPARATUS - A cylinder apparatus includes a flow path which is provided in a valve member and through which a fluid circulates when a rod is moved; a disk valve which opens and closes the flow path; and a spring member which presses the disk valve in an axial direction. The spring member includes a first spring which comes into contact with the disk valve in a state in which the disk valve closes the flow path, and a second spring which comes into contact with the disk valve in a state in which the disk valve opens the flow path. | 01-31-2013 |
20130192457 | CYLINDER APPARATUS - Provided is a cylinder apparatus capable of obtaining optimum valve characteristics. The cylinder apparatus has an annular valve member provided with at least a part of flow paths and having a through-bore, a pin member inserted through the through-bore of the valve member, and an annular disk valve having the pin member inserted therethrough and movable at both inner and outer peripheries thereof selectively away from and into contact with one end surface of the valve member to open and close the flow paths, respectively. The valve member has a projecting portion around the through-bore on the one end surface. The projecting portion is locally provided with circumferentially spaced grooves. The disk valve has small-diameter portions extending toward the grooves from the inner periphery thereof. The small-diameter portions are slidable relative to the pin member. | 08-01-2013 |
20140090940 | SHOCK ABSORBER - A shock absorber includes an annular outer seat protruding from a valve main body, an inner seat protruding inward of the outer seat of the valve main body, an intermediate seat disposed between the outer seat and the inner seat of the valve main body and protruding to surround an opening section of a passage, a first disk having a larger diameter than the outer seat and seated on the intermediate seat, a spring member configured to press the first disk toward the outer seat, a second disk stacked on the first disk, and a communication unit configured to bring the passage in communication with a space between the intermediate seat and the outer seat. The first disk starts to be pressed by the spring member to abut the outer seat while abutting the inner seat and the intermediate seat. | 04-03-2014 |
20150034182 | CYLINDER APPARATUS - A cylinder apparatus includes a flow path formed at a valve member through which a fluid flows when a rod is moved, a valve configured to open and close the flow path, and a restriction member disposed at a side in a direction in which the flow path of the valve is opened. The restriction member is an annular plate-shaped member in which an attachment hole is formed. The restriction member has a plurality of spring sections extending in the radial direction and configured to bias the valve toward the valve member and a stroke restriction section extending from between the neighboring spring sections in the radial direction and configured to restrict a stroke of the valve, which are installed at an outer circumferential side thereof. The stroke restriction section extends to form the same plane as the inner circumferential side of the restriction member. | 02-05-2015 |