Abstract: A fluid pressure shock absorber mounted on a vehicle includes: a cylinder tube; a rod inserted into the cylinder tube so as to be movable back and forth; a piston connected to the rod and dividing an interior of the cylinder tube into a bottom-side chamber and a rod-side chamber; a damping valve configured to impart resistance to a flow of working fluid between the bottom-side chamber and the rod-side chamber, the damping valve being capable of changing damping characteristic in response to a pilot pressure; and a solenoid valve configured to switch supply and shut off of a pilot pressure to the damping valve, wherein the working fluid in the bottom-side chamber or the rod-side chamber is used as the pilot pressure.

Abstract: Provided are a method for manufacturing a sliding member, a method for manufacturing a shock absorber, a sliding member, a shock absorber, and a method for adjusting ride comfort capable of improving retention of lubricating oil between sliding members while increasing operability and capable of sustaining smooth sliding of the sliding members. A method for manufacturing a sliding member that performs a sliding operation in a presence of a lubricating oil, the method having a first polishing step of polishing a surface of the sliding member in a circumferential direction of the sliding member by using a polishing tape having a first whetstone to form a plurality of grooves disposed around the sliding member in the circumferential direction; and a second polishing step of polishing the sliding member after the first polishing step to form a surface cross section in a longitudinal direction of the sliding member in a plateau shape.

Abstract: A manufacturing method of a trivalent chromium plated part in which a trivalent chromium plating film is formed on a sliding part of a device that seals fluid, the method includes: a step of forming the trivalent chromium plating film on a base material or on a base plating firm formed on a base material surface; a step of applying an external force to the trivalent chromium plating firm; and a step of applying a baking treatment to the trivalent chromium plating firm after the external force is applied.

Abstract: An electric pump system includes: a pump configured such that a discharge flow rate is controlled in accordance with an opening degree of a solenoid valve, the operation of the solenoid valve being controlled by energization; an electric motor configured to drive the pump; and a control device configured to control the operations of the solenoid valve of the pump and the electric motor based on the command signal indicating the required discharge flow rate or the required discharge pressure of the pump. The control device is configured to adjust the operations of the solenoid valve and the electric motor when the determination condition, which is for determination of whether a predetermined vibration is generated in the electric pump system or the CVT, is satisfied.

Abstract: A fluid pressure shock absorber includes a damping valve that is capable of changing damping characteristic in response to a pilot pressure, and a pilot valve configured to supply the working fluid in the bottom-side chamber or the rod-side chamber to a pilot chamber of the damping valve as a pilot pressure. The pilot valve has a first pilot chamber configured such that the working fluid is guided from the bottom-side chamber, and a second pilot chamber configured such that the working fluid is guided from the rod-side chamber. When the fluid pressure shock absorber is not extended/contracted, the pilot valve supplies the pilot pressure to the pilot chamber of the damping valve, and when the fluid pressure shock absorber is extended/contracted, the pilot valve holds the pilot pressure in the pilot chamber of the damping valve supplied when the fluid pressure shock absorber is not extended/contracted.

Abstract: A lubricating oil composition according to the present embodiment is a lubricating oil composition to be used in a sliding member coated with hydrogen-containing diamond-like carbon, and contains a base oil and a friction modifier. The friction modifier contains a fatty acid ester of pentaerythritol.

Abstract: A solenoid relief valve system includes: a solenoid relief valve; and a control unit; wherein the control unit has a dither generating unit configured to generate the dither on a plunger by applying a first dither signal or a second dither signal having different amplitude or frequency from the first dither signal to current to be supplied to a coil, and wherein the dither generating unit is configured to apply the first dither signal to the current to be supplied to the coil during adjustment of a setting pressure, by which the current to be supplied to the coil is caused to be changed, and configured to apply the second dither signal to the current to be supplied to the coil in a state in which the adjustment of the setting pressure is not performed.

Abstract: A shock absorber of the present invention includes a cylinder, a piston slidably inserted into the cylinder, a piston rod movably inserted into the cylinder, a rebound spring including a coil spring disposed on an outer periphery of the piston rod and an annular lower collar attached to the coil spring, and an annular support facing the lower collar in an axial direction and supporting a piston side end of the lower collar, in which the support includes a cylindrical portion attached to the outer periphery of the piston rod, and a receiving portion that is annular, has an inner periphery connected to an anti-piston side end of the cylindrical portion, faces a piston side end of the lower collar in the axial direction, and is capable of abutting on the lower collar, and a regulating portion that regulates eccentricity of the lower collar with respect to the receiving portion is provided.

Abstract: A damping valve of the present invention includes: a partition wall body that is annular, and is inserted into a cylindrical body, is radially positioned only by the cylindrical body, and has an annular outer circumferential valve seat protruding axially from an axial one end and a port provided on an inner circumferential side of the outer circumferential valve seat; a valve stopper having an annular inner circumferential valve seat facing the one end of the partition wall body and having an outer diameter smaller than that of the outer circumferential valve seat; and an annular leaf valve that is interposed between the outer circumferential valve seat and the inner circumferential valve seat and is set to be open to both the inside and the outside to open and close the port, wherein the partition wall body includes an aligning portion that aligns the leaf valve with respect to the outer circumferential valve seat.

Abstract: A spring guide made of fiber-reinforced resin, includes: a disc-shaped base portion configured to support a coil spring, the coil spring being configured to elastically support a vehicle body; and a barrel portion through which a cylinder of a shock absorber is inserted, in the barrel portion, the fiber-reinforced resin is oriented in a circumferential direction.

Abstract: A solenoid includes a first fixed iron core and a second fixed iron core located on a first end side and a second end side of an axial direction of a coil, a first movable iron core and a second movable iron core located therebetween and attracted by the first fixed iron core and the second fixed iron core by passage of current through the coil, respectively, a spring that biases the first movable iron core to the second fixed iron core side, a leaf spring that regulates movement of the first movable iron core to the second fixed iron core side with respect to the second movable iron core, and a communication passage that causes the first fixed iron core side of the second movable iron core to communicate with the second fixed iron core side.

Abstract: A shock absorber includes a hard-side damping element for applying resistance to a flow of liquid from a compression side chamber to an extension side chamber, a solenoid valve capable of changing an opening area of a compression side bypass passage for communicating the compression side chamber and the extension side chamber by bypassing the hard-side damping element, and a soft-side damping element provided in the compression side bypass passage in series with the solenoid valve. The hard-side damping element has an orifice and a leaf valve provided in parallel with the orifice. The soft-side damping element has an orifice having an opening area larger than that of the orifice.

Abstract: A seal device for a hydraulic apparatus according to the present invention includes an annular main piston split body (outer member), a sub piston split body (inner member) inserted into inside the main piston split body (outer member), and a seal ring accommodated in an annular groove provided in the outer circumference of the sub piston split body (inner member) and abutting on the other of the main piston split body (outer member) to prevent a liquid from passing through a gap between the main piston split body (outer member) and the sub piston split body (inner member), in which the seal ring has a self-lubricating property and has a cylindrical surface centered on an axis on an inner peripheral surface (bottom facing surface) facing a bottom of the annular groove.

Abstract: Provided are a shock absorber-lubricating oil composition, a lubricating oil additive, and a method for adjusting the friction characteristics of the shock absorber-lubricating oil composition, capable of making both operation stability and ride comfort compatible with each other. A shock absorber-lubricating oil composition contains a base oil and a friction modifier. The friction modifier contains a pentaerythritol ester. The base oil contains an ester oil as a main component.

Abstract: A valve includes: a leaf valve component; an opposing surface opposing to the component, the opposing surface being configured to prohibit passage of working fluid in a liquid path where the component is arranged; and a seating surface configured to come into contact with the component and prohibit passage of the working fluid in the liquid path in a case in which the component is elastically deformed by a predetermined amount, wherein, in an allowing stroke, during which the passage of the working fluid is allowed, the component is elastically deformed in a direction away from the seating surface so as to allow the passage of the working fluid, and the predetermined amount is set such that the component comes into contact with the seating surface when the speed of a piston exceeds an upper limit value of a predetermined normal range in a restricting stroke.

Abstract: A shock absorber according to the present embodiment includes a shock absorber main body having a cylindrical outer shell and a rod movably inserted into the outer shell, and a knuckle bracket attached to an outer periphery of a lower end of the outer shell, in which the knuckle bracket is formed by bending a single metal plate as a base material and includes a pair of clamping pieces that are curved along the outer periphery of the outer shell and clamp the outer shell, a pair of attachment pieces that extend in a radial direction of the outer shell from ends in a circumferential direction of the respective clamping pieces and face each other, a connecting piece that connects ends of the attachment pieces, and a pair of notches that cut off the three-plane intersection point where the clamping pieces, the attachment pieces, and the connecting piece intersect.

Abstract: A shock absorber according to the present embodiment includes a shock absorber main body having a cylindrical outer shell and a rod movably inserted into the outer shell, and a knuckle bracket attached to an outer periphery of a lower end of the outer shell, in which the knuckle bracket includes a pair of clamping pieces that are curved along an outer periphery of the outer shell and clamp the outer shell, a pair of attachment pieces that extend in a radial direction of the outer shell from the ends in a circumferential direction of the respective clamping pieces and face each other, and a connecting piece that connects ends of the attachment pieces, a width between the tip ends in the circumferential direction of the inner peripheral surfaces of the respective clamping pieces is larger than the outer diameter of the outer shell, and the proximal end side than the tip ends in the circumferential direction of the inner peripheral surfaces of the respective clamping pieces abuts on the outer periphery of the ou

Abstract: A production apparatus for a liquid containing gas bubbles includes a casing, a pump unit, and a gas bubble-mixing unit. The casing is provided with a main flow channel for a liquid, the main flow channel having a liquid inflow port and a liquid outflow port. The pump unit is disposed in the main flow channel and pumps the liquid to the liquid outflow port from the liquid inflow port. The gas bubble-mixing unit includes a first choke portion that is disposed in the main flow channel and has an inner diameter decreased and a gas supply channel that supplies the first choke portion with a gas.

Abstract: A valve device includes: a main spool including supply passages and a supply-side land portion; and a valve block including an outflow passage, in which the supply passage allows a supply port to communicate with the outflow passage in a process of the main spool moving from a neutral position toward one stroke end in an axial direction, and the supply passage allows a supply port to communicate with the outflow passage in a process of the main spool moving from the neutral position toward the other stroke end in the axial direction, and the supply passage allows the supply port to communicate with the outflow passage in the process of the main spool moving toward the one stroke end and allows the supply port to communicate with the outflow passage in the process of the main spool moving toward the other stroke end.

Abstract: A shock absorber is provided. The shock absorber of the present invention includes a shock absorber main body, a damping passage, a primary damping force generation component, and a secondary damping force generation component. The shock absorber main body has an outer tube and a rod and is stretchable. The damping passage communicates operating chambers with each other provided in the shock absorber main body. The primary and secondary damping force generation components are provided in series with the damping passage. The secondary damping force generation component includes a secondary valve, an annular facing portion, and a valve stopper. The annular facing portion faces the secondary valve with an annular gap between the annular facing portion and the secondary valve. The valve stopper has elasticity to allow bending, and when the secondary valve bends and comes in contact with the valve stopper, restricts the secondary valve from bending.