Abstract: An arrangement structure for a seal member includes: a first member having a first mating surface and provided with a groove portion; a second member having a second mating surface, and configured to move relatively to the first member; and an annular seal member fitted into the groove portion, providing sealing between the first member and the second member, and serving as a partition between an atmosphere-side space and a pressurized-side space. The seal member includes a plurality of first protruding portions protruding toward the second mating surface and aligned from the atmosphere-side space toward the pressurized-side space. The seal member has such a shape that, in a state of not being fitted into the groove portion, a protrusion height of the first protruding portion increases in stages from the first protruding portion arranged close to the pressurized-side space toward the first protruding portion arranged close to the atmosphere-side space.

Abstract: A seal structure includes a ring-shaped seal member. The seal member is disposed in a seal groove. The case includes a low-pressure lateral face in a cross section of the seal structure, the cross section being taken along an imaginary plane in parallel with a shaft axial direction of the shaft and passing through a center line of the shaft. The seal member includes a first protruding portion. The first protruding portion protrudes from a main portion having a bottom face in contact with the low-pressure lateral face, and has a shape such that the first protruding portion extends toward the shaft as the first protruding portion extends toward the low-pressure side. The first protruding portion includes a tip. The first protruding portion includes a contact region in contact with the shaft. The tip is closer to the low-pressure side than the contact region is.

Abstract: A seal member is disposed in a seal groove at a sliding gap between a shaft and a case. The seal member includes an outer periphery, a curved inner periphery, a mounting face, and an upper face. The mounting face is recessed toward the upper face. The upper face is recessed toward the mounting face. The relation of 0.755?h/H?0.

Abstract: In a jig for press-fitting a divided sealing ring, while a sleeve is attached to a first rod head, a guide region leading to a recess is defined between an inner circumferential surface of the sleeve and a rod. When a divided sealing ring attached to an outer circumferential surface of the rod is press-fitted to a prescribed position in the recess by passing the divided sealing ring through the guide region by using a plunger, positioning engagement regions engaged with each other are provided between the sleeve and the plunger.

Abstract: A split seal ring includes: an annular main body seal split partially in a circumferential direction; and abutment surfaces provided on split surfaces of the main body seal so as to be joined to each other. Each of the abutment surfaces includes: a first inclined surface extending in a direction intersecting with the circumferential direction; a first horizontal surface extending from one end side of the first inclined surface along the circumferential direction; and a second inclined surface extending from an end of the first horizontal surface opposite to the first inclined surface in the direction intersecting with the circumferential direction. With this configuration, there can be provided a split seal ring having a structure that can improve the sealing performance.

Abstract: An arrangement structure for a seal member includes: a first member having a first mating surface and provided with a groove portion; a second member having a second mating surface, and configured to move relatively to the first member; and an annular seal member fitted into the groove portion, providing sealing between the first member and the second member, and serving as a partition between an atmosphere-side space and a pressurized-side space. The seal member includes a plurality of first protruding portions protruding toward the second mating surface and aligned from the atmosphere-side space toward the pressurized-side space. The seal member has such a shape that, in a state of not being fitted into the groove portion, a protrusion height of the first protruding portion increases in stages from the first protruding portion arranged close to the pressurized-side space toward the first protruding portion arranged close to the atmosphere-side space.

Abstract: A seal structure includes a ring-shaped seal member. The seal member is disposed in a seal groove. The case includes a low-pressure lateral face in a cross section of the seal structure, the cross section being taken along an imaginary plane in parallel with a shaft axial direction of the shaft and passing through a center line of the shaft. The seal member includes a first protruding portion. The first protruding portion protrudes from a main portion having a bottom face in contact with the low-pressure lateral face, and has a shape such that the first protruding portion extends toward the shaft as the first protruding portion extends toward the low-pressure side. The first protruding portion includes a tip. The first protruding portion includes a contact region in contact with the shaft. The tip is closer to the low-pressure side than the contact region is.

Abstract: In a jig for press-fitting a divided sealing ring, while a sleeve is attached to a first rod head, a guide region leading to a recess is defined between an inner circumferential surface of the sleeve and a rod. When a divided sealing ring attached to an outer circumferential surface of the rod is press-fitted to a prescribed position in the recess by passing the divided sealing ring through the guide region by using a plunger, positioning engagement regions engaged with each other are provided between the sleeve and the plunger.

Abstract: A split seal ring includes: an annular main body seal split partially in a circumferential direction; and abutment surfaces provided on split surfaces of the main body seal so as to be joined to each other. Each of the abutment surfaces includes: a first inclined surface extending in a direction intersecting with the circumferential direction; a first horizontal surface extending from one end side of the first inclined surface along the circumferential direction; and a second inclined surface extending from an end of the first horizontal surface opposite to the first inclined surface in the direction intersecting with the circumferential direction. With this configuration, there can be provided a split seal ring having a structure that can improve the sealing performance.

Abstract: The shock absorber includes an oil pressure damper (1), a piston rod (2) and a cushion spring (3), wherein the cushion spring (3) contacts to the piston rod side with an end thereof and another end (6) thereof contacts to a spring receiving face (8) of a spring seat (7). Since the spring seat (7) is integrated with an adjuster (10) by engaging claws (9) with the adjuster (10) and is also integrated with a movable cover (20), the spring seat (7), the adjuster (10) and the movable cover (20) rotate and move to an axial direction as one body.