Abstract: A hydraulic damper includes: a cylinder extending from one side to the other side and containing liquid; a rod configured to move relative to the cylinder; a first piston configured to move relative to the cylinder inside the cylinder along with relative movement of the rod and generate damping force; a first elastic member inside the cylinder and configured to be displaced along with relative movement of the rod; a second elastic member separate from the first elastic member inside the cylinder and configured to be displaced along with relative movement of the rod; and a second piston separate from the first piston and configured to move relative to the cylinder inside the cylinder, to be always supported by the first and second elastic members so as to be movable inside the cylinder, and to generate damping force that varies according to displacement of the first and second elastic members.

Abstract: A polypropylene composition made from or containing (i) component (1) made from or containing a propylene/ethylene copolymer containing 2 to 4% by weight of an ethylene-derived unit, based upon the total weight of the propylene/ethylene copolymer; and (ii) component (2) made from or containing an ethylene/propylene copolymer containing 65 to 87% by weight of an ethylene-derived unit, based upon the total weight of the ethylene/propylene copolymer; wherein the polypropylene composition has 1) a weight ratio of component (1) to component (2) in the range of 65:35 to 77:23, 2) an intrinsic viscosity of xylene solubles (XSIV) in the range of 0.8 to 1.4 dl/g, 3) a MFR (at 230° C. under a load of 2.16 kg) in the range of 15 to 40 g/10 min., and 4) the absence of a crystal nucleating agent.

Abstract: A hydraulic shock absorber includes: a cylinder that houses a liquid; a piston housing provided in the cylinder so as to be movable in an axial direction and partitions a space in the cylinder into a first oil chamber and a second oil chamber; a valve seat forming a channel for a liquid flowing across the first oil chamber and the second oil chamber in conjunction with movement of the piston housing; a damping valve that opens and closes a channel port of the channel in the valve seat to control a flow of the oil through the channel: a pressure chamber that houses the oil and that enables a pressure of the oil that has been housed to be changed; and a pressing portion that uses a pressure in the pressure chamber to press the damping valve in a direction in which the damping valve closes the channel port.

Abstract: A pressure damper includes: a cylinder containing fluid; a defining member disposed in the cylinder movably in an axial direction and configured to define a space in the cylinder into a first fluid chamber and a second fluid chamber that contain the fluid; a passage forming portion configured to form passages of the fluid that flows in accordance with a displacement of the defining member; first passages as defined herein; second passages as defined herein; a control member that opens and closes the first passages and the second passages so as to control flows of the fluid in the first passages and the second passages; and a load application member as defined herein.

Abstract: A hydraulic damping device includes a cylinder 11, a cylinder 12, a piston 30 that partitions a space in the cylinder 11, a piston rod 20 that is connected to the piston 30, a bottom valve 40 that separates the interior of the cylinder 11 from a reservoir chamber R and has a communication passage of a liquid between the interior of the cylinder 11 and the reservoir chamber R, and a check valve mechanism 50 that is disposed in a radial direction of an area where movement of the piston 30 in the cylinder 11 is restricted or an area extended axially on an outer side of the cylinder 11, and permits a flow in one direction between the interior of the cylinder 11 and the reservoir chamber R caused by the movement of the piston 30 and restricts the flow in the other direction.

Abstract: A hydraulic shock absorber includes a cylinder, a piston ring, a first valve seat forming an extension side oil path, a first valve opening and closing the extension side oil path, a second valve seat forming an inner-side channel through which oil flows separately from a flow of the oil causing the first valve to open the extension side oil path, a second valve opening and closing the inner-side channel, a spool provided to press the second valve toward the inner-side channel, a base member holding the spool, and an axially-movable free piston forming a back pressure chamber communicating with the inner-side channel and that houses the oil between the spool and the base member.

Abstract: An aspect of the present invention has a first disk-shaped member coupled to a first rotating shaft to rotate and a first plate-shaped member having a surface perpendicular to a surface of the first disk-shaped member and holding a first magnet. Moreover, a second disk-shaped member provided so as to face the first disk-shaped member and coupled to a second rotating shaft to rotate, and a second plate-shaped member having a surface perpendicular to a surface of the second disk-shaped member and holding a second magnet are provided. A magnetic pole of the first magnet on a side facing the second magnet and a magnetic pole of the second magnet on a side facing the first magnet have the same pole.

Abstract: A hydraulic shock absorber includes a cylinder, a piston ring, a first valve seat forming an extension side oil path, a first valve opening and closing the extension side oil path, a second valve seat forming an inner-side channel through which oil flows separately from a flow of the oil causing the first valve to open the extension side oil path, a second valve opening and closing the inner-side channel, a spool provided to press the second valve toward the inner-side channel, a base member holding the spool, and an axially-movable free piston forming a back pressure chamber communicating with the inner-side channel and that houses the oil between the spool and the base member.

Abstract: A pressure damper includes: a cylinder containing fluid; a defining member disposed in the cylinder movably in an axial direction and configured to define a space in the cylinder into a first fluid chamber and a second fluid chamber that contain the fluid; a passage forming portion configured to form passages of the fluid that flows in accordance with a displacement of the defining member; first passages as defined herein; second passages as defined herein; a control member that opens and closes the first passages and the second passages so as to control flows of the fluid in the first passages and the second passages; and a load application member as defined herein.

Abstract: A hydraulic shock absorber includes: a cylinder that houses a liquid; a piston housing provided in the cylinder so as to be movable in an axial direction and partitions a space in the cylinder into a first oil chamber and a second oil chamber; a valve seat forming a channel for a liquid flowing across the first oil chamber and the second oil chamber in conjunction with movement of the piston housing; a damping valve that opens and closes a channel port of the channel in the valve seat to control a flow of the oil through the channel: a pressure chamber that houses the oil and that enables a pressure of the oil that has been housed to be changed; and a pressing portion that uses a pressure in the pressure chamber to press the damping valve in a direction in which the damping valve closes the channel port.

Abstract: A hydraulic damping device includes a cylinder 11, a cylinder 12, a piston 30 that partitions a space in the cylinder 11, a piston rod 20 that is connected to the piston 30, a bottom valve 40 that separates the interior of the cylinder 11 from a reservoir chamber R and has a communication passage of a liquid between the interior of the cylinder 11 and the reservoir chamber R, and a check valve mechanism 50 that is disposed in a radial direction of an area where movement of the piston 30 in the cylinder 11 is restricted or an area extended axially on an outer side of the cylinder 11, and permits a flow in one direction between the interior of the cylinder 11 and the reservoir chamber R caused by the movement of the piston 30 and restricts the flow in the other direction.