Abstract: A solenoid valve includes a main valve having a valve seat and a main valve body configured to open or close a main flow passage, a pilot passage that branches from the main flow passage, an orifice provided in the pilot passage, a back-pressure chamber configured to bias the main valve body to a closing direction by virtue of an internal pressure, a pilot valve configured to control an internal pressure of the back-pressure chamber, and a solenoid configured to control a valve opening pressure of the pilot valve. There is a time difference between a valve opening timing of the main valve and a valve opening timing of the pilot valve such that the valve opening timing of the main valve is delayed from the valve opening timing of the pilot valve.

Abstract: A solenoid valve includes a valve seat provided in a main flow passage, a main valve body configured to open or close the main flow passage, a pilot passage that branches from the main flow passage, an orifice provided in the pilot passage, a back-pressure chamber connected to the pilot passage downstream from the orifice to bias the main valve body to a closing direction by virtue of an internal pressure, a pilot valve disposed in the pilot passage downstream from a connection point to the back-pressure chamber to control an internal pressure of the back-pressure chamber, a solenoid configured to control a valve opening pressure of the pilot valve, and a second orifice provided between the back-pressure chamber and the pilot valve.

Abstract: A suspension apparatus includes a first extension-side damping valve provided in the first flow path; a first contraction-side damping valve provided in the first flow path in parallel with the first extension-side damping valve; a second extension-side damping valve provided in the second flow path; a second contraction-side damping valve provided in the second flow path in parallel with the second extension-side damping valve; a first damping valve configured to impart resistance to the flow of fluid from the first flow path to the first accumulator; a first check valve disposed in parallel with the first damping valve; a second damping valve configured to impart resistance to the flow of fluid from the second flow path to the second accumulator; and a second check valve disposed in parallel with the second damping valve.

Abstract: A shock absorber includes an extension-side damping valve, which provides an extension-side damping force, a first bypass passage, which bypasses the extension-side damping valve, a first pressure chamber, a first free piston, and a first spring, which are disposed in the first bypass passage, a contraction-side damping valve, which provides a contraction-side damping force, a second bypass passage, which bypasses the contraction-side damping valve, and a second pressure chamber, a second free piston, and a second spring, which are disposed in the second bypass passage.

Abstract: There is provided a suspension device capable of improving roll stiffness without deteriorating the durability of a seal and the riding comfort of a vehicle, the suspension device including: a pair of liquid pressure dampers; a first passage which communicates the extension side chamber with the compression side chamber; a second passage which communicates the compression side chamber with the extension side chamber; and two accumulators, in which each of the accumulators includes a casing, a first free piston which defines a gas chamber inside the casing, and a second free piston which defines a first gas chamber and a second gas chamber inside the gas chamber, and a pressure receiving area near the first gas chamber in the second free piston is set to be smaller than a pressure receiving area near the second gas chamber.

Abstract: In a shock absorber, an outer case made of resin is disposed so as to cover an inner case made of metal, and the outer case forms a reservoir chamber for storing the hydraulic fluid between the outer case and the inner case. The outer case is supported by the inner case via protrusions, which are formed on either one of the outer peripheral surface of the inner case and the inner peripheral surface of the outer case so as to protrude toward and abut the other one of the outer peripheral surface of the inner case and the inner peripheral surface of the outer case.

Abstract: A shock absorber includes: a bottomed cylindrical outer tube that is disposed so as to cover an inner case, and that is formed of a resin and is closed at one end by a closing part; a joint member that is embedded by insert molding in an opening end of the outer tube; and a coupling member that is coupled to the joint member.

Abstract: In a shock absorber 100, 200, an inner case 1 is biased in the axial direction relative to an outer case 2 made of resin by a spring 5, and the inner case 1 and the outer case 2 abut each other in the radial direction via ribs 2g, 8c.

Abstract: A solenoid valve includes a valve seat provided in a main flow passage, a main valve body configured to open or close the main flow passage, a pilot passage that branches from the main flow passage, an orifice provided in the pilot passage, a back-pressure chamber connected to the pilot passage downstream from the orifice to bias the main valve body to a closing direction by virtue of an internal pressure, a pilot valve disposed in the pilot passage downstream from a connection point to the back-pressure chamber to control an internal pressure of the back-pressure chamber, a solenoid configured to control a valve opening pressure of the pilot valve, and a second orifice provided between the back-pressure chamber and the pilot valve.

Abstract: A solenoid valve includes a main valve having a valve seat and a main valve body configured to open or close a main flow passage, a pilot passage that branches from the main flow passage, an orifice provided in the pilot passage, a back-pressure chamber configured to bias the main valve body to a closing direction by virtue of an internal pressure, a pilot valve configured to control an internal pressure of the back-pressure chamber, and a solenoid configured to control a valve opening pressure of the pilot valve. There is a time difference between a valve opening timing of the main valve and a valve opening timing of the pilot valve such that the valve opening timing of the main valve is delayed from the valve opening timing of the pilot valve.

Abstract: A port (2a, 2b) allows a fluid to flow from a first fluid chamber (41, 42) to a second fluid chamber (42, 41) separated by the piston (1) of a shock absorber via a damping valve (10a, 10b). A flow sectional area of a passage (21d, 21e, 26d, 26e) connecting the first fluid chamber (41, 42) to the port (2a, 2b) is reduced by a throttle valve (12, 14, 51, 52) according to a pressure in the first fluid chamber (41, 42). A pressure of a pressure chamber (18, 19) and a biasing force of a plate spring (25, 29, 71, 72) acts on the throttle valve (12, 14, 51, 52) in an opposite direction to the pressure of the first fluid chamber (41, 42). The hydraulic shock absorber is thereby caused to generate different damping force characteristics depending on a stroke speed of the piston (1).

Abstract: A shock absorber comprises a first passage (2a, 2b) and a second passage (15) connecting a first fluid chamber (41) and a second fluid chamber (42). A throttle (12, 14) narrows an inflow of fluid to the first passage (2a, 2b) according to an applied displacement pressure. The displacement pressure includes a fluid pressure in one of the two fluid chambers (41, 42) and a pressure that depends on a velocity of the fluid flow through the throttle (12, 14). A spring (25, 29) biases the throttle (12, 14) in the opposite direction to narrow the fluid flow. The second passage (15) comprises a pair of orifices (16a, 17a). By exerting a pressure between the pair of orifices (16a, 17a) on the throttle (12, 14) in the opposite direction to narrow the fluid flow, the spring load required of the spring (25, 29) is reduced.

Abstract: A damping valve (10) resists a flow of fluid from a first fluid chamber (41) to a second fluid chamber (42) which are separated by a piston (1). A partitioning member (24, 27-29, 52) partitions an inflow space (A, B) of a passage (2) in the first fluid chamber (41). A spool (17, 31, 51) decreases a flow cross-sectional area of a flow path from the first fluid chamber (41) into the inflow space (A, B) according to a differential pressure between the fluid chambers. By ensuring a gap between the outer circumference of the valve disk (1) and the partitioning member (24, 27-29, 52) which permanently allows fluid to flow from the first chamber (41) into the inflow space (A, B), the damping force characteristic in a high speed region of piston displacement can be set independently of the damping force characteristic in other regions.

Abstract: A port (2a, 2b) allows a fluid to flow from a first fluid chamber (41, 42) to a second fluid chamber (42, 41) separated by the piston (1) of a shock absorber via a damping valve (10a, 10b). A flow sectional area of a passage (21d, 21e, 26d, 26e) connecting the first fluid chamber (41, 42) to the port (2a, 2b) is reduced by a throttle valve (12, 14, 51, 52) according to a pressure in the first fluid chamber (41, 42). A pressure of a pressure chamber (18, 19) and a biasing force of a plate spring (25, 29, 71, 72) acts on the throttle valve (12, 14, 51, 52) in an opposite direction to the pressure of the first fluid chamber (41, 42). The hydraulic shock absorber is thereby caused to generate different damping force characteristics depending on a stroke speed of the piston (1).

Abstract: A shock absorber comprises a first passage (2a, 2b) and a second passage (15) connecting a first fluid chamber (41) and a second fluid chamber (42). A throttle (12, 14) narrows an inflow of fluid to the first passage (2a, 2b) according to an applied displacement pressure. The displacement pressure includes a fluid pressure in one of the two fluid chambers (41, 42) and a pressure that depends on a velocity of the fluid flow through the throttle (12, 14). A spring (25, 29) biases the throttle (12, 14) in the opposite direction to narrow the fluid flow. The second passage (15) comprises a pair of orifices (16a, 17a). By exerting a pressure between the pair of orifices (16a, 17a) on the throttle (12, 14) in the opposite direction to narrow the fluid flow, the spring load required of the spring (25, 29) is reduced.

Abstract: A damping valve (10) resists a flow of fluid from a first fluid chamber (41) to a second fluid chamber (42) which are separated by a piston (1). A partitioning member (24, 27-29, 52) partitions an inflow space. (A, B) of a passage (2) in the first fluid chamber (41). A spool (17, 31, 51) decreases a flow cross-sectional area of a flow path from the first fluid chamber (41) into the inflow space (A, B) according to a differential pressure between the fluid chambers. By ensuring a gap between the outer circumference of the valve disk (1) and the partitioning member (24, 27-29, 52) which permanently allows fluid to flow from the first chamber (41) into the inflow space (A, B), the damping force characteristic in a high speed region of piston displacement can be set independently of the damping force characteristic in other regions.

Abstract: This invention relates to a pressure reducing valve wherein a spool is driven axially by a first plunger which moves according to the magnetization state of a first solenoid, and a control port is connected to a supply port and a tank port according to the axial position of this spool. The pressure of the control port acts on the spool in the opposite direction to that of the plunger via a feedback passage, and the pressure increases or decreases according to the current flowing through the first solenoid. According to this invention, a second plunger is arranged in series with the first plunger, and a spring tends to push the second plunger toward the first plunger. A second magnetized solenoid however keeps the second plunger held back against the restoring force of the spring so that it is not in contact with the first plunger, and releases the second plunger so that it pushes the first plunger when the current fails.