Abstract: A motion conversion mechanism includes: a cylindrical body having an internal screw and third gear teeth in an inner periphery thereof, the internal screw being provided in a screw region that is an intermediate region in an axial direction of the cylindrical body; a shaft body disposed coaxially with the cylindrical body inside the cylindrical body and having first gear teeth and a first external screw in an outer periphery thereof; and a plurality of planetary rollers. First planetary rollers among the planetary rollers mesh with the gear teeth formed in a first gear region and do not mesh with the gear teeth formed in a second gear region, and second planetary rollers among the planetary rollers mesh with the gear teeth formed in the second gear region and do not mesh with the gear teeth formed in the first gear region.

Abstract: A motion conversion mechanism includes: a cylindrical body having an internal screw and third gear teeth in an inner periphery thereof, the internal screw being provided in a screw region that is an intermediate region in an axial direction of the cylindrical body; a shaft body disposed coaxially with the cylindrical body inside the cylindrical body and having first gear teeth and a first external screw in an outer periphery thereof; and a plurality of planetary rollers. First planetary rollers among the planetary rollers mesh with the gear teeth formed in a first gear region and do not mesh with the gear teeth formed in a second gear region, and second planetary rollers among the planetary rollers mesh with the gear teeth formed in the second gear region and do not mesh with the gear teeth formed in the first gear region.

Abstract: A method for detecting fluid leakage from a pressure-decrease valve in a hydraulic brake system having an ABS device including: a shutoff valve for shutting off supply of a working fluid from a fluid-pressure supply source to a brake device provided for a wheel; the pressure-decrease valve for discharging the working fluid from the brake device; a reservoir for storing the working fluid discharged from the pressure-decrease valve; and a return pump for returning the working fluid stored in the reservoir to a portion between the shutoff valve and the fluid-pressure supply source, the method including the steps of: activating the return pump in a state in which the hydraulic brake system is not in ABS operation, and detecting the fluid leakage from the pressure-decrease valve based on a variation in a pressure of the working fluid in the fluid-pressure supply source caused when the return pump is activated.

Abstract: In an electromagnetic valve in which a valve body unit is housed in a housing, the unit has a plunger including a groove portion at its cylindrical outer peripheral face. The groove portion extends in the cylinder axis direction and moves in the cylinder axis direction by an electromagnetic force generated by an electromagnetic coil. A rod is secured to the plunger and abuts against a valve seat for opening and closing the valve when the plunger is moved to close the valve and releasing the abutment of the rod against the seat when the plunger is moved to open the valve. A cylindrical sleeve covers the outer peripheral face of the plunger and is configured integrally with the plunger. A communication passage defined by the groove portion of the plunger and the inner peripheral face of the sleeve extends in the cylinder axis direction.

Abstract: A first ECU estimates whether the operation of a second actuator has been started, based on the variation of the hydraulic pressure with respect to the flow rate of hydraulic fluid outputted from a first actuator. Even in a case where the operation information of the second actuator is not received, the first ECU sets the control mode to a simultaneous operation mode, when it is estimated that the operation of the second actuator has been started. In the simultaneous operation mode, a controlled parameter of linear control valves on assumption that the second actuator is operating is set up, and a stop instruction of regenerative braking is transmitted to a hybrid ECU.

Abstract: An electromagnetic linear valve which can effectively suppress a self-excited oscillation of a plunger is provided. A resilient member 64 urges a plunger 22 in a direction in which the core-opposing portions 70, 78 move away from a core portion 28, and moves the plunger 22 in a direction in which the core-opposing portions 70, 78 approach the core portion 28 in the case where an electric current is supplied to a coil 24.

Abstract: A normally closed solenoid valve includes a valve element arranged to be seatable on and unseatable from a valve seat. A movable core is movable with the valve element. A first spring biases the valve element and the movable core toward the valve seat. A coil and a stator core generate an electromagnetic force resistive to a load of the first spring for the movable core. A second spring applies a load smaller than and resistive to the load of the first spring to the valve element and the movable core. The valve further includes a load adjusting mechanism for adjusting the load of the first spring, and a stroke adjusting mechanism for adjusting an unseating stroke of the valve element from the valve seat.

Abstract: A first ECU estimates whether the operation of a second actuator has been started, based on the variation of the hydraulic pressure with respect to the flow rate of hydraulic fluid outputted from a first actuator. Even in a case where the operation information of the second actuator is not received, the first ECU sets the control mode to a simultaneous operation mode, when it is estimated that the operation of the second actuator has been started. In the simultaneous operation mode, a controlled parameter of linear control valves on assumption that the second actuator is operating is set up, and a stop instruction of regenerative braking is transmitted to a hybrid ECU.

Abstract: A method for detecting fluid leakage from a pressure-decrease valve in a hydraulic brake system having an ABS device including: a shutoff valve for shutting off supply of a working fluid from a fluid-pressure supply source to a brake device provided for a wheel; the pressure-decrease valve for discharging the working fluid from the brake device; a reservoir for storing the working fluid discharged from the pressure-decrease valve; and a return pump for returning the working fluid stored in the reservoir to a portion between the shutoff valve and the fluid-pressure supply source, the method including the steps of: activating the return pump in a state in which the hydraulic brake system is not in ABS operation, and detecting the fluid leakage from the pressure-decrease valve based on a variation in a pressure of the working fluid in the fluid-pressure supply source caused when the return pump is activated.

Abstract: In an electromagnetic valve in which a valve body unit is housed in a housing, the unit has a plunger including a groove portion at its cylindrical outer peripheral face. The groove portion extends in the cylinder axis direction and moves in the cylinder axis direction by an electromagnetic force generated by an electromagnetic coil. A rod is secured to the plunger and abuts against a valve seat for opening and closing the valve when the plunger is moved to close the valve and releasing the abutment of the rod against the seat when the plunger is moved to open the valve. A cylindrical sleeve covers the outer peripheral face of the plunger and is configured integrally with the plunger. A communication passage defined by the groove portion of the plunger and the inner peripheral face of the sleeve extends in the cylinder axis direction.

Abstract: An electromagnetic linear valve includes a housing including a core closing an opening at one end portion of the body portion, and a separation portion separating an interior into a first liquid chamber located in a core side and a second liquid chamber; a plunger disposed in the first liquid chamber so as to move along the axis in a state in which one end thereof faces to the core and the other end can sit on a hole; an elastic member applying a force to move the plunger away from the core; and a coil generating magnetic field to move the plunger toward the core. A recess is formed in a section of an inner circumferential portion of the body portion which intersects with an end face of the core in the first direction.

Abstract: An electromagnetic valve includes a housing, a valve element, a movable core, a spring, a coil, and a stationary core. The housing includes a cylinder portion that houses the movable core so that the movable core is movable in an axial direction. An axial intermediate portion of the cylinder portion is formed as a non-magnetic portion that surrounds an outer circumference of an axial intermediate portion of the movable core. Both axial sides of the non-magnetic portion are formed as a one-side magnetic portion and an another-side magnetic portion that surround an outer circumference of the movable core.

Abstract: An electromagnetic valve includes a housing, a plunger, a spring, and a solenoid. The housing includes a cylindrical guide member configured to assist axial movement of the plunger, a seat member assembled to the guide member with a valve hole formed therein, a stationary core arranged so as to be opposed to an end portion of the guide member at a predetermined distance away therefrom in an axial direction, and a sleeve coupled, in a liquid-tight manner, to each of an outer circumference of an end portion of the stationary core and an outer circumference of the end portion of the guide member so as to integrally couple the stationary core and the guide member to each other.

Abstract: A normally closed solenoid valve (100) includes a housing (10), and a valve element (21), a movable core (22), a first spring (23), a second spring (24), a coil (25), a stator core (26), and other components, which are assembled to the housing (10). The valve element (21) is arranged so as to be seatable on and unseatable from a valve seat (12c). The movable core (22) is assembled to a cylinder section (11b) of the housing (10) so as to be movable integrally with the valve element (21) in an axial direction of the movable core (22). The first spring (23) is configured to bias the valve element (21) and the movable core (22) toward the valve seat (12c). The coil (25) and the stator core (26) are configured to generate an electromagnetic force resistive to a load of the first spring (23) for the movable core (22) through energization of the coil (25).

Abstract: An electromagnetic linear valve includes: (a) a plunger including a large outside-diameter portion and a small outside-diameter portion, and (b) a housing having a through-hole and including a large inside-diameter portion in which the large outside-diameter portion is inserted with a clearance being defined between the large inside-diameter portion and the large outside-diameter portion, and a small inside-diameter portion in which the small outside-diameter portion is inserted with a clearance being defined between the small inside-diameter portion and the outside-diameter portion. The plunger has an end portion which serves as a valve body that is to be seated on a valve seat constituted by an opening of the through-hole. The large outside-diameter portion has an end portion constituted by another end portion of the plunger that is opposite to the above-described end portion of the plunger.

Abstract: In an electromagnetic linear valve, a resilient member urges a plunger in a direction in which the core-opposing portions move away from a core portion, and moves the plunger in a direction in which the core-opposing portions approach the core portion where an electric current is supplied to a coil. Where no electric current is supplied to the coil, an axially opposing surface area as a surface area of portions of the core-opposing portions which respectively oppose inner peripheral surfaces of recessed portions is smaller than a radially opposing surface area as a surface area of portions of the core-opposing portions which respectively oppose bottom surfaces of the recessed portions, and the axially opposing surface area becomes larger than the radially opposing surface area where an electric current is supplied to the coil and the core-opposing portions approach most to the core portion.

Abstract: An electromagnetic linear valve includes a housing including a core closing an opening at one end portion of the body portion, and a separation portion separating an interior into a first liquid chamber located in a core side and a second liquid chamber; a plunger disposed in the first liquid chamber so as to move along the axis in a state in which one end thereof faces to the core and the other end can sit on a hole; an elastic member applying a force to move the plunger away from the core; and a coil generating magnetic field to move the plunger toward the core. A recess is formed in a section of an inner circumferential portion of the body portion which intersects with an end face of the core in the first direction.

Abstract: A brake control apparatus (20) includes: a hydraulic pressure source (30) that regulates pressure of hydraulic fluid in accordance with a brake operation input (24,25); a wheel cylinder (23) that applies braking force to a wheel (22) in response to a supply of the hydraulic fluid to the wheel cylinder (23); a hydraulic pressure booster mechanism (31) that amplifies the brake operation input by using the hydraulic pressure source (30), and outputs the amplified brake operation input; a hydraulic fluid supply path (63) through which the hydraulic fluid is supplied from the hydraulic pressure source (30) to the wheel cylinder (23); and a controller (70) that shuts off (valve 66) a flow of the hydraulic fluid-through the hydraulic fluid supply path (63), if a malfunction due to hydraulic fluid leakage is detected in the hydraulic fluid supply path (63) during a brake control mode in which the hydraulic fluid is supplied to the wheel cylinder (23) through the hydraulic fluid supply path (63).

Abstract: An electromagnetic linear valve includes: (a) a plunger including a large outside-diameter portion and a small outside-diameter portion, and (b) a housing having a through-hole and including a large inside-diameter portion in which the large outside-diameter portion is inserted with a clearance being defined between the large inside-diameter portion and the large outside-diameter portion, and a small inside-diameter portion in which the small outside-diameter portion is inserted with a clearance being defined between the small inside-diameter portion and the outside-diameter portion. The plunger has an end portion which serves as a valve body that is to be seated on a valve seat constituted by an opening of the through-hole. The large outside-diameter portion has an end portion constituted by another end portion of the plunger that is opposite to the above-described end portion of the plunger.

Abstract: A member (1) resistant to erosion by cavitation on which an amorphous carbon film coating is formed on a surface of a base material has at least a first amorphous carbon film coating (4) having a plurality of columnar structures (4a) on the surface of the base material (2), and a second amorphous carbon film coating (5) having a plurality of granular structures (5a) deposited with no orientation on the surface of the first amorphous carbon film coating (4).