Abstract: A driving force transmission mechanism is capable of preventing breakage of an oil chamber when the internal pressure in the oil chamber rises by impact when replacing work rolls and the like. The driving force transmission mechanism transmits power of a driving source to a work roll through a spindle and includes a first gear portion disposed on one end portion of the spindle, a second gear part disposed on the driving source or the work roll and fitted to the first gear part and an oil chamber for supplying a lubricating oil to the first gear part and the second gear part, where the oil chamber is provided with a first valve for discharging inner air in the oil chamber to an outside of the oil chamber and a second valve for introducing outer air into the oil chamber.

Abstract: A shock absorber according to the present invention includes: a shock absorber main body having an outer shell and a rod; and a knuckle bracket attached to an outer circumference of the bottom end of the outer shell.

Abstract: A rubber sheet includes: a main body formed into an arc shape or an annular shape; a seating portion formed into a groove shape at the main body, a coil spring being configured to be seated on the seating portion; and a deformation restricting portion formed to project outside in a radial direction from an outer periphery of the main body at a position, on which a terminal portion of the coil spring is seated, of the main body, the deformation restricting portion being configured to restrict deformation of the main body.

Abstract: A shock absorber includes a cylindrically-shaped mounting member having an outer peripheral surface bonded at one end or both ends, the mounting member having an outer diameter at an end surface side smaller than an outer diameter at a center portion, and a reinforcement welding performed at the end surface side of the mounting member at a bonding portion of the mounting member.

Abstract: A rubber sheet includes: a main body fitted to a mounting portion formed so as to be depressed at the spring guide, the main body supporting a coil spring; and lips formed to project from respective side surfaces of an inner periphery and an outer periphery of the main body in a radial direction, the lips being configured to abut on the spring guide to prevent a foreign matter from invading between the main body and the mounting portion.

Abstract: A spring guide includes: a mounting portion formed so as to be depressed, the rubber sheet being fitted to the mounting portion; and a plurality of lock pieces formed to stand at an outer periphery of the mounting portion. At least one of the plurality of the first lock pieces and the second lock piece is disposed at a position that restricts deformation of a circumferential end portion of the rubber sheet to an outside in a radial direction, in a state where the rubber sheet is fitted to the mounting portion.

Abstract: A dust boot includes a tubular boot body and an annular flange portion linked to an upper end of the boot body. In an outer side of the flange portion, an angle between the flange portion and a line perpendicular to an axis of the boot body is set to be larger than 0° and smaller than 90°.

Abstract: A cylinder device includes a cylinder that has one end from which a piston rod extends, a pipe-shaped cover member that has an extendable bellows portion and a small-diameter portion whose inner diameter is smaller than an inner diameter of the bellows portion, the cover member being configured to protect the piston rod, and a capping member fitted into the cylinder, the capping member having a convex portion to which the small-diameter portion of the cover member is locked, at an outer periphery, wherein at the small-diameter portion of the cover member, a bulge portion that bulges outside in a radial direction is formed.

Abstract: A shock absorber includes a shock absorber body, a suspension spring, a spring seat, and a spring rubber seat. The seat surface of the spring rubber seat is formed inclined so as to be higher toward a distal end within a predetermined range from the distal end where a spiral portion of the suspension spring becomes apart to a side where the spiral portion of the suspension spring abuts. A concave portion surrounded by a portion abutting on the spring seat is formed on a lower side of the predetermined range in a lower part of the spring rubber seat.

Abstract: A rubber sheet includes: a main body fitted to a mounting portion formed so as to be depressed at the spring guide, the main body supporting a coil spring; and lips formed to project from respective side surfaces of an inner periphery and an outer periphery of the main body in a radial direction, the lips being configured to abut on the spring guide to prevent a foreign matter from invading between the main body and the mounting portion.

Abstract: A spring guide includes: a mounting portion formed so as to be depressed, the rubber sheet being fitted to the mounting portion; and a plurality of lock pieces formed to stand at an outer periphery of the mounting portion. At least one of the plurality of the first lock pieces and the second lock piece is disposed at a position that restricts deformation of a circumferential end portion of the rubber sheet to an outside in a radial direction, in a state where the rubber sheet is fitted to the mounting portion.

Abstract: A rubber sheet includes: a main body formed into an arc shape or an annular shape; a seating portion formed into a groove shape at the main body, a coil spring being configured to be seated on the seating portion; and a deformation restricting portion formed to project outside in a radial direction from an outer periphery of the main body at a position, on which a terminal portion of the coil spring is seated, of the main body, the deformation restricting portion being configured to restrict deformation of the main body.

Abstract: A shock absorber includes a cylindrically-shaped mounting member having an outer peripheral surface bonded at one end or both ends, the mounting member having an outer diameter at an end surface side smaller than an outer diameter at a center portion, and a reinforcement welding performed at the end surface side of the mounting member at a bonding portion of the mounting member.

Abstract: A cylinder device includes a cylinder that has one end from which a piston rod extends, a pipe-shaped cover member that has an extendable bellows portion and a small-diameter portion whose inner diameter is smaller than an inner diameter of the bellows portion, the cover member being configured to protect the piston rod, and a capping member fitted into the cylinder, the capping member having a convex portion to which the small-diameter portion of the cover member is locked, at an outer periphery, wherein at the small-diameter portion of the cover member, a bulge portion that bulges outside in a radial direction is formed.

Abstract: A dust boot includes a tubular boot body and an annular flange portion linked to an upper end of the boot body. In an outer side of the flange portion, an angle between the flange portion and a line perpendicular to an axis of the boot body is set to be larger than 0° and smaller than 90°.

Abstract: A shock absorber includes a shock absorber body, a suspension spring, a spring seat, and a spring rubber seat. The seat surface of the spring rubber seat is formed inclined so as to be higher toward a distal end within a predetermined range from the distal end where a spiral portion of the suspension spring becomes apart to a side where the spiral portion of the suspension spring abuts. A concave portion surrounded by a portion abutting on the spring seat is formed on a lower side of the predetermined range in a lower part of the spring rubber seat.