Valve device and shock absorber including the same
The present disclosure relates to a valve device and a shock absorber including same. The valve device for controlling a damping force, which is disposed, on one side of a piston having a passage through which fluid moves, inside a shock absorber, includes: a rebound retainer disposed on the one side of the piston and including a first rebound retainer chamber concavely formed in an annular shape to allow a portion of fluid passing through the passage to be stored, and a retainer hole formed in the first rebound retainer chamber; and a first disk for guiding fluid passing through the retainer hole to move through a slit formed in an outer circumferential surface thereof.
1 . A shock absorber comprising:
a body in which fluid is stored;
a piston disposed inside the body to form a compression chamber on one side and a rebound chamber on the other side, and having a rebound passage and a compression passage through which the compression chamber and the rebound chamber communicate with each other;
a damping force adjusting unit, disposed on one side of the piston, for adjusting a damping force of the fluid passing through the rebound passage;
a rebound valve that contacts at least a portion of the damping force adjusting unit, the rebound valve being opened and closed by a pressure of the fluid passing through the rebound passage to form a damping force; and
a compression valve disposed on the other side of the piston, the compression valve being opened and closed by a pressure of the fluid passing through the compression passage to form a damping force,
wherein the piston includes:
a first piston chamber formed to store the fluid passing through the compression passage in a region facing the compression valve on the other side of the piston; and
a second piston chamber formed to store the fluid passing through the rebound passage in a region facing the damping force adjusting unit on one side of the piston, the second piston chamber having a larger volume than that of the first piston chamber.
2 . The shock absorber of claim 1 , wherein the damping force adjusting unit includes:
a rebound retainer including a first rebound retainer chamber disposed on one side of the piston and formed concavely in an annular shape to store a part of the fluid passing through the second piston chamber, and a retainer hole formed in the first rebound retainer chamber.
3 . The shock absorber of claim 2 , wherein the damping force adjusting unit further includes:
a first disk for guiding the fluid passing through the retainer hole to move to a slit formed in an outer circumferential surface of the first disk.
4 . The shock absorber of claim 3 , wherein the rebound retainer further includes:
a first protrusion that contacts a portion of the first disk adjacent to a central portion of the first disk;
a second protrusion that contacts a portion of an outer peripheral portion of the first disk;
a second rebound retainer chamber concavely formed between the first protrusion and the second protrusion and communicating with the retainer hole;
a third rebound retainer chamber in which fluid passing through the slit is stored; and
a third protrusion that protrudes to contact a portion of the rebound valve on one side of the third rebound retainer chamber.
5 . The shock absorber of claim 4 , wherein the damping force adjusting unit further includes:
a second disk for guiding the fluid passing through the slit to move to the third rebound retainer chamber; and
a retainer disposed between the second disk and the rebound valve.
6 . The shock absorber of claim 5 , wherein the first disk, the second disk, and the retainer are disposed between the first protrusion and the third protrusion.
7 . The shock absorber of claim 3 , wherein the first disk and the rebound retainer adjust damping forces in different speed ranges depending on a moving speed of the piston.
8 . The shock absorber of claim 2 , wherein the rebound passage of the piston includes a plurality of rebound passages, and
wherein the piston further includes a rebound bridge that is formed between the plurality of rebound passages, is inclined toward a center of the piston, at least partially faces the first rebound retainer chamber, and forms a part of the second piston chamber.
9 . The shock absorber of claim 2 , wherein a region of the second piston chamber communicating with the rebound passage is inclined so that the fluid passing through the rebound passage flows into the second piston chamber.
10 . A valve device for controlling a damping force, which is disposed, on one side of a piston having a passage through which fluid moves, inside a shock absorber, the valve device comprising:
a rebound retainer disposed on the one side of the piston and including a first rebound retainer chamber concavely formed in an annular shape to allow a portion of fluid passing through the passage to be stored, and a retainer hole formed in the first rebound retainer chamber; and
a first disk for guiding fluid passing through the retainer hole to move through a slit formed in an outer circumferential surface thereof,
wherein the rebound retainer further includes:
a first protrusion that contacts a portion of the first disk adjacent to a central portion of the first disk;
a second protrusion that contacts a portion of an outer peripheral portion of the first disk;
a second rebound retainer chamber concavely formed between the first protrusion and the second protrusion and communicating with the retainer hole; and
a third rebound retainer chamber, for storing fluid passing through the slit, spaced apart from the second rebound retainer chamber around the second protrusion.
11 . The valve device of claim 10 , further comprising:
a second disk for guiding fluid stored in the second rebound retainer chamber to move to the third rebound retainer chamber.
12 . The valve device of claim 11 , further comprising:
a rebound valve that is opened and closed by a pressure of the fluid passing through the passage to form a damping force.
13 . The valve device of claim 10 , wherein the second protrusion is formed to have a larger length in a direction away from the piston than the first protrusion.
14 . The valve device of claim 10 , further comprising a rebound valve, wherein the rebound retainer further includes a third protrusion that protrudes to contact a portion of the rebound valve on one side of the third rebound retainer chamber.
15 . The valve device of claim 10 , wherein during a rebound stroke of the piston, the fluid passing through the retainer hole forms a damping force while passing between the rebound retainer and the first disk.
16 . The valve device of claim 10 , wherein during a rebound stroke of the piston, the fluid passing through the retainer hole forms a damping force while passing through the slit.
17 . A valve device for controlling a damping force, which is disposed, on one side of a piston having a passage through which fluid moves, inside a shock absorber, the valve device comprising:
a rebound retainer disposed on the one side of the piston and including a first rebound retainer chamber concavely formed in an annular shape to allow a portion of fluid passing through the passage to be stored, and a retainer hole formed in the first rebound retainer chamber; and
a first disk for guiding fluid passing through the retainer hole to move through a slit formed in an outer circumferential surface thereof,
wherein the rebound retainer further includes:
a first protrusion that contacts a portion of the first disk adjacent to a central portion of the first disk; and
a second protrusion that contacts a portion of an outer peripheral portion of the first disk, wherein the second protrusion is formed to have a larger length in a direction away from the piston than the first protrusion.
18 . The valve device of claim 17 , wherein the rebound retainer further includes:
a second rebound retainer chamber concavely formed between the first protrusion and the second protrusion and communicating with the retainer hole.
19 . The valve device of claim 18 , further comprising a rebound valve, wherein the rebound retainer further includes
a third rebound retainer chamber, for storing fluid passing through the slit, spaced apart from the second rebound retainer chamber around the second protrusion; and
a third protrusion that protrudes to contact a portion of the rebound valve on one side of the third rebound retainer chamber.
20 . The valve device of claim 19 , further comprising a second disk for guiding fluid stored in the second rebound retainer chamber to move to the third rebound retainer chamber, wherein the rebound valve is opened and closed by a pressure of the fluid passing through the passage to form a damping force.