Abstract: A front fork includes a tubular cylinder; a free piston slidably inserted into the cylinder to partition the cylinder into a pressure chamber and a reservoir; a piston slidably inserted into the cylinder to partition the pressure chamber into an extension-side chamber and a contraction-side chamber; a piston rod having one end connected to the piston and the other end side extending oppositely to the free piston side and protruding outward of the cylinder; a passage configured to allow the pressure chamber and the reservoir to communicate with each other; and a check valve provided in the passage and configured to allow only a flow of the hydraulic fluid from the reservoir to the pressure chamber.

Abstract: A front fork includes a fork main body, a damper cartridge, and a closing member. The damper cartridge includes a cylinder, a piston mounted on a piston rod, and a rod guide which guides the piston rod and to which a fluid filling port that allows the outside of the cylinder to communicate with the fluid chamber is provided. The closing member is provided on the rod guide and closes the fluid filling port.

Abstract: There is provided a front fork which has a small number of components with simple structure and is easy to assemble. In order to achieve the above object, in a front fork F according to the means for solving the problem of the present invention, first and second adjusters 5, 6 are mounted on a cap 4 so as to be axially movable, and a contact portion 52 of the first adjuster 5 in contact with a first adjustment rod 7 and a contact portion 62 of the second adjuster 6 in contact with a second adjustment rod 8 are displaced in an axial direction of a vehicle body tube 2 so as not to interfere with each other. Therefore, even when each of the first and second adjusters 5, 6 moves in the axial direction with respect to the cap 4, the corresponding first and second adjustment rods 7, 8 can be moved independently without being interfered with each other.

Abstract: A front fork is provided with a plurality of adjusters, while including a spring adjuster. In a front fork according to the means for solving the problem of the present invention, a spring adjuster is rotatably mounted on a position eccentric to a center of a cap as viewed in an axial direction and includes a screw portion disposed in an outer periphery protruded into a fork main body, and a plate in which the screw portion of the spring adjuster is screwed to change support positions of a suspension spring is brought into contact with a case (tubular member) at two points on both sides in a circumferential direction of the normal of the case that passes a mounting center of the spring adjuster. Accordingly, while being prevented from rotating, the plate can be downsized and can be disposed so as not to interfere with first and second adjusters.

Abstract: A front fork includes a fork main body, a damper cartridge, and a closing member. The damper cartridge includes a cylinder, a piston mounted on a piston rod, and a rod guide which guides the piston rod and to which a fluid filling port that allows the outside of the cylinder to communicate with the fluid chamber is provided. The closing member is provided on the rod guide and closes the fluid filling port.

Abstract: There is provided a front fork provided with a plurality of adjusters, while including a spring adjuster. In order to achieve the above object, in a front fork F according to the means for solving the problem of the present invention, a spring adjuster A is rotatably mounted on a position eccentric to a center O of a cap 4 as viewed in an axial direction and includes a screw portion 35 disposed in an outer periphery protruded into a fork main body 1, and a plate P in which the screw portion 35 of the spring adjuster A is screwed to change support positions of a suspension spring S is brought into contact with a case (tubular member) 14a at two points on both sides in a circumferential direction of the normal of the case 14a that passes a mounting center of the spring adjuster A. Accordingly, while being prevented from rotating, the plate P can be downsized and can be disposed so as not to interfere with first and second adjusters 5, 6.

Abstract: A front fork includes a tubular cylinder; a free piston slidably inserted into the cylinder to partition the cylinder into a pressure chamber and a reservoir; a piston slidably inserted into the cylinder to partition the pressure chamber into an extension-side chamber and a contraction-side chamber; a piston rod having one end connected to the piston and the other end side extending oppositely to the free piston side and protruding outward of the cylinder; a passage configured to allow the pressure chamber and the reservoir to communicate with each other; and a check valve provided in the passage and configured to allow only a flow of the hydraulic fluid from the reservoir to the pressure chamber.

Abstract: There is provided a front fork which has a small number of components with simple structure and is easy to assemble. In order to achieve the above object, in a front fork F according to the means for solving the problem of the present invention, first and second adjusters 5, 6 are mounted on a cap 4 so as to be axially movable, and a contact portion 52 of the first adjuster 5 in contact with a first adjustment rod 7 and a contact portion 62 of the second adjuster 6 in contact with a second adjustment rod 8 are displaced in an axial direction of a vehicle body tube 2 so as not to interfere with each other. Therefore, even when each of the first and second adjusters 5, 6 moves in the axial direction with respect to the cap 4, the corresponding first and second adjustment rods 7, 8 can be moved independently without being interfered with each other.

Abstract: A hydraulic shock absorber includes a cylinder connected to a wheel side, a liquid chamber formed in the cylinder and filled with an operating liquid, an annular rod guide fixed to the cylinder and closing a vehicle body side of the liquid chamber, a piston rod connected to the vehicle body side, penetrating a shaft core part of the rod guide, and going into/out of the cylinder, a piston held by the piston rod and dividing the liquid chamber into an extension-side chamber and a compression-side chamber, and an annular bush fitted in an inner periphery of the rod guide and pivotally supporting the piston rod, movably in an axial direction, in which the piston rod includes a columnar sliding shaft portion in sliding contact with the bush and a first injection portion for injecting the operating liquid provided on a side opposite to the piston of the sliding shaft portion and outside a range of a damper stroke.

Abstract: A shock absorber includes a shock absorber body interposed between a vehicle body and a wheel, a cylinder connected to a wheel side and standing in a shaft center portion of the shock absorber body, a liquid chamber formed in the cylinder and filled with an operating liquid, an annular rod guide fixed to the cylinder and closing a liquid chamber's vehicle body side, a piston rod connected to a vehicle body side, penetrating a shaft center portion of the rod guide, and going into and out of the cylinder, an annular seal member held on a rod guide's inner periphery and in sliding contact with a piston rod's outer peripheral surface, and a relief portion formed on a piston rod's outer periphery and forming a gap between the piston rod and the seal member when the piston rod retreats from the cylinder by a predetermined amount.

Abstract: A hydraulic shock absorber includes a cylinder connected to a wheel side, a liquid chamber formed in the cylinder and filled with an operating liquid, an annular rod guide fixed to the cylinder and closing a vehicle body side of the liquid chamber, a piston rod connected to the vehicle body side, penetrating a shaft core part of the rod guide, and going into/out of the cylinder, a piston held by the piston rod and dividing the liquid chamber into an extension-side chamber and a compression-side chamber, and an annular bush fitted in an inner periphery of the rod guide and pivotally supporting the piston rod, movably in an axial direction, in which the piston rod includes a columnar sliding shaft portion in sliding contact with the bush and a first injection portion for injecting the operating liquid provided on a side opposite to the piston of the sliding shaft portion and outside a range of a damper stroke.

Abstract: A shock absorber includes a shock absorber body interposed between a vehicle body and a wheel, a cylinder connected to a wheel side and standing in a shaft center portion of the shock absorber body, a liquid chamber formed in the cylinder and filled with an operating liquid, an annular rod guide fixed to the cylinder and closing a liquid chamber's vehicle body side, a piston rod connected to a vehicle body side, penetrating a shaft center portion of the rod guide, and going into and out of the cylinder, an annular seal member held on a rod guide's inner periphery and in sliding contact with a piston rod's outer peripheral surface, and a relief portion formed on a piston rod's outer periphery and forming a gap between the piston rod and the seal member when the piston rod retreats from the cylinder by a predetermined amount.

Abstract: A fluid pressure damper is provided with a damper main body composed of an outer tube and an inner tube, a bottom member for sealing a bottom side opening of the damper main body, a suspension spring and a damper. The damper includes a cylinder storing a working fluid inside. The cylinder is inserted into the inner tube and fixed to the bottom member by being sandwiched between a head member fixed to a joint member coupled to the inner tube and the bottom member. The joint member includes a stopper member with the inner periphery of which the head member is threadably engaged, and a pin member which couples the stopper member to the inner periphery of the inner tube. The suspension spring is supported by the stopper member.

Abstract: A fluid pressure damper is provided with a damper main body composed of an outer tube and an inner tube, a bottom member for sealing a bottom side opening of the damper main body, a suspension spring and a damper. The damper includes a cylinder storing a working fluid inside. The cylinder is inserted into the inner tube and fixed to the bottom member by being sandwiched between a head member fixed to a joint member coupled to the inner tube and the bottom member. The joint member includes a stopper member with the inner periphery of which the head member is threadably engaged, and a pin member which couples the stopper member to the inner periphery of the inner tube. The suspension spring is supported by the stopper member.

Abstract: A suspension spring and a double-rod damper are installed in the interior of a front fork which comprises a body-side tube and a wheel-side tube. The double-rod damper comprises a piston housed in a cylinder, and an upper rod and a lower rod connected to the piston. The upper rod is formed to have a smaller diameter than the lower rod. By providing an orifice which allows working oil in an upper oil chamber formed around the upper rod to flow into a reservoir while causing the pressure in the upper oil chamber to increase, expansion and contraction of air bubbles mixed into working oil in the cylinder is prevented, thereby improving the response of a damping force generated in the front fork.

Abstract: A suspension spring (S) and a double-rod damper (D) are installed in the interior of a front fork which comprises a body-side tube (1) and a wheel-side tube (2). The double-rod damper (D) comprises a piston (5) housed in a cylinder (3), and an upper rod (41) and a lower rod (42) connected to the piston (5). The upper rod (41) is formed to have a smaller diameter than the lower rod (42). By providing an orifice (6) which allows working oil in an upper oil chamber (R1) formed around the upper rod (41) to flow into a reservoir (R) while causing the pressure in the upper oil chamber (R1) to increase, expansion and contraction of air bubbles mixed the into working oil in the cylinder (3) is prevented, thereby improving the response of a damping force generated in the front fork.