Damper device
AssigneePiolax, Inc.
InventorJun SAITO
Life of this patent
Estimating the term…
Abstract
A damper device includes: a cylinder; a rod; a piston having an annular groove; a seal ring; and a friction member. A seal portion is formed between the cylinder and the piston. When the piston moves in a damper braking direction, the seal ring is configured to press the friction member to expand the friction member in diameter, and an outer peripheral surface of the friction member is configured to be brought into pressure contact with an inner peripheral surface of the cylinder. The friction member is formed to be smaller than a size of the inner peripheral surface of the cylinder when no pressing force is applied from the seal ring.
Claims8
A damper device configured to be attached between a pair of members that are configured to move toward or away from each other, and configured to apply a braking force when the pair of members move toward or away from each other, the damper device comprising:
- a cylinder having an opening portion at one end portion;
- a rod movably inserted into the cylinder through the opening portion;
- a piston connected to the rod and having an annular groove formed on an outer periphery thereof;
- a seal ring disposed in the annular groove on a side of a damper braking direction in a manner of being movable in an axial direction and configured to come into pressure contact with an inner peripheral surface of the cylinder;
- and
- a friction member disposed in the annular groove on a side of a return direction opposite to the damper braking direction with respect to the seal ring,
- wherein a seal portion is formed between the cylinder and the piston by the seal ring and the friction member, or by the seal ring,
- wherein an air chamber is formed in the cylinder via the seal portion,
- wherein when the piston moves in the damper braking direction, the seal ring is configured to press the friction member to expand the friction member in diameter, and an outer peripheral surface of the friction member is configured to be brought into pressure contact with an inner peripheral surface of the cylinder,
- wherein the friction member is formed to be smaller than a size of the inner peripheral surface of the cylinder when no pressing force is applied from the seal ring,
- wherein an inclined surface is provided on one of the friction member and a bottom surface of the annular groove, and an inclined surface contact portion configured to come into contact with the inclined surface is provided on the other of the friction member and the bottom surface of the annular groove, and
- wherein when the piston moves in the damper braking direction, the inclined surface contact portion is configured to be pressed against the inclined surface while a contact position on the inclined surface changes, and the friction member is configured to be expanded in diameter.
(canceled)
A damper device configured to be attached between a pair of members that are configured to move toward or away from each other, and configured to apply a braking force when the pair of members move toward or away from each other, the damper device comprising:
- a cylinder having an opening portion at one end portion;
- a rod movably inserted into the cylinder through the opening portion;
- a piston connected to the rod and having an annular groove formed on an outer periphery thereof;
- a seal ring disposed in the annular groove on a side of a damper braking direction in a manner of being movable in an axial direction and configured to come into pressure contact with an inner peripheral surface of the cylinder;
- and
- a friction member disposed in the annular groove on a side of a return direction opposite to the damper braking direction with respect to the seal ring,
- wherein a seal portion is formed between the cylinder and the piston by the seal ring and the friction member, or by the seal ring,
- wherein an air chamber is formed in the cylinder via the seal portion,
- wherein when the piston moves in the damper braking direction, the seal ring is configured to press the friction member to expand the friction member in diameter, and an outer peripheral surface of the friction member is configured to be brought into pressure contact with an inner peripheral surface of the cylinder,
- wherein the friction member is formed to be smaller than a size of the inner peripheral surface of the cylinder when no pressing force is applied from the seal ring, and
- wherein the seal ring includes a base portion having an annular shape and disposed within the annular groove, at least two inner diameter side protruding portions protruding from an inner diameter side surface of the base portion, and an outer diameter side protruding portion protruding from an outer diameter side surface of the base portion and configured to come into contact with the inner peripheral surface of the cylinder.
Dependencies are inferred from the claim text.