Aisin Aw Co., Ltd.

Masaya Nakai

Takahiro Kokubu

Kazunori Ishikawa

Kota Fukao

Noriomi Fujii

Tomonari Okamoto

Kenichi Naka

Susumu Kato

Kazuhiko Kato

Tomomi Ishikawa

Tadamasa Takei

Haruki Yamamoto

Eikichi Kidokoro

Junichi Terai

A lock shaft and a shaft member (a plunger and a permanent magnet) of a magnetic locking device are arranged such that a moving direction thereof is orthogonal to a moving direction of a piston rod of a hydraulic actuator. In a parking lock released state, when the coil is not energized, the lock shaft and the shaft member are locked by an attracting force between the permanent magnet and a flange of a yoke so as not to move back from the piston rod, and, when the coil is energized, the attracting force between the permanent magnet and the flange is canceled, so that the lock shaft and the shaft member are allowed to move back from the piston rod.

Parking device

A detent leverand a piston rodare engaged with each other through engagement between a recessed portionof the detent leverand a pin portionof a retainer memberattached to the piston rod. With this configuration, the detent leverand the piston rodcan be engaged with each other easily and in a short time when assembling a parking device. As a result, the time required for the work of assembling the parking devicecan be shortened.

Parking device and method of assembling the same

A magnetic lock device includes a lock shaft having an abutting portion capable of abutting against a roller of a piston rod of a hydraulic pressure actuator, a transfer shaft configured separately from the lock shaft, the transfer shaft abutting against an end surface of the lock shaft, and a magnetic portion locking (restricting movement to the right side in the drawing) the lock shaft, the transfer shaft, and a plunger by attracting the plunger toward an attracting portion using a magnetic force. The lock shaft is surface-hardened to have a higher hardness and the transfer shaft is made of non-magnetic material.

Magnetic lock device and parking device

A plate spring is attached to the distal-end portion of a piston. The distance Lbetween the distal-end portion of a plunger and a core (recessed portion) that faces the distal-end portion of the plunger is set to be shorter than the distance Lbetween the distal-end portion (plate spring) of the piston and the projecting end surface of a valve main body that faces the distal-end portion of the piston with drive of a solenoid portion stopped. Consequently, when the solenoid portion is driven, the plate spring collides against the projecting end surface of the valve main body so that the plunger does not collide against the core. As a result, a shock applied to the piston can be absorbed by the elastic force of the plate spring, which suppresses generation of a sound of collision.

Electromagnetic pump

An electromagnetic pump including a piston, an electromagnetic portion that moves the piston forward, and a spring that moves the piston backward. The piston including a discharge check valve built in the piston. The piston is formed with a hollow portion that opens in an inner peripheral portion of an end surface of the piston, and a spring receiving surface formed on an outer peripheral portion of the end surface to receive the spring. The discharge check valve is fixed through plastic deformation of the piston by inserting the discharge check valve into the hollow portion from an opening of the piston, and partially pressing a portion of the spring receiving surface of the piston on an inner peripheral side after the insertion to recess the spring receiving surface and elevate an inner peripheral surface of the piston surrounding the hollow portion.

An electromagnetic pump configured with an electromagnetic portion that generates an electromagnetic force for pressing the piston, and an urging member that urges the piston in a direction opposite to the electromagnetic force. A strainer member including a disk-shaped portion which has a disk shape and in which a strainer surface is formed, and a side portion that extends from an outer peripheral edge of the disk-shaped portion. A suction check valve being capable of sucking the working fluid via the strainer surface. The piston, the urging member, the suction check valve, and the strainer member are sequentially inserted into the cylinder from a side opposite to the electromagnetic portion, and the cover member is attached so as to press the strainer surface.

Electromagnetic pump with a strainer mounted onto the inlet of the suction valve

An electromagnetic pump including a suction check valve including a tubular portion and a flange portion that extends in a radial direction from an end edge of the tubular portion, the suction check valve being formed with a through hole that penetrates the tubular portion and the flange portion to form a suction port in an end surface of the flange portion. A strainer attached to the suction port and having a pore forming region which is larger than an inside diameter of the through hole at the tubular portion and in which a large number of pores are formed. The suction check valve is formed with a diameter reducing portion formed such that the inside diameter of the through hole is reduced from the flange portion toward the tubular portion with a degree of diameter reduction varied from a large value to a small value.

Electromagnetic pump device

An electromagnetic pump includes a cylinder with a stepped inner diameter with first and second inner diameters. A piston inside the cylinder, with a stepped outer diameter including first and second outer diameters slidable on the respective inner diameters, defines first and second fluid chambers. Reciprocal movement of the piston produces a greater change in volume in the first chamber than the second chamber. An electromagnetic portion moves the piston to decrease the volume of the first chamber and increase the volume of the second chamber. A biasing member moves the piston to increase the volume of the first chamber and decrease the volume of the second chamber. A first valve allows fluid to flow to the first chamber and prohibits reverse flow. A second valve embedded in the piston allows fluid to flow from the first chamber to the second chamber and prohibits reverse flow.

An electromagnetic pump including a reciprocating piston in a cylinder; an electromagnetic portion that moves the piston forward; a first biasing member that moves the piston backward; a support member that supports the first biasing member and defines a pump chamber together with the cylinder and the piston; an intake valve that is incorporated into the support member, is connected to an intake port and prohibits hydraulic fluid from moving in reverse; and a discharge valve that is connected to a discharge port and prohibits the hydraulic fluid from moving in reverse. The intake valve includes a ball, an opening portion of the intake port, and a second biasing member that presses the ball against the opening portion from a side opposite to a direction in which the hydraulic fluid moves. In the opening member, an inner peripheral surface that receives the ball is formed in a taper shape.

A linear solenoid device comprising an energizable coil; a movable core; a first fixed core as a magnetic member having a recess capable of accommodating one end of the movable core; a second fixed core as a magnetic member having an inner peripheral surface slidably supporting the movable core; and an annular non-magnetic member coaxially connecting the first fixed core and the second fixed core to each other, wherein the linear solenoid device is capable of being driven by an attraction force applied to the movable core towards the first fixed core upon energization of the coil, and the non-magnetic member is formed so that an inner peripheral surface of the non-magnetic member functions together with the inner peripheral surface of the second fixed core as a sliding surface along which the movable core is slidable.

Linear solenoid device and electromagnetic valve

In a solenoid valve including a cylindrical sleeve which is formed with an input port, an output port, a drain port and a feedback port, and a spool which is inserted into the sleeve and which is formed with a plurality of lands for closing the individual ports, and a communication portion for communicating the individual ports; an input notch is formed in an end edge of the land located near the input port, while a drain notch is formed in an end edge of the land located near the drain port, and an axial height Hin of the input notch and an axial height Hdr of the drain notch are set so that the proportion &#x3b1; (=Hin/(Hin+Hdr)) of the height Hin to the sum of the heights Hin and Hdr may fall within a range of at least 0.72 (preferably, 0.85) and less than 1.0.

Solenoid valve

A spool valve system includes a valve main body with, from a first side to a second side, an input port to which an input pressure is supplied, an output port that outputs an output pressure, and a drain port that discharges the input pressure; and a spool that is structured to move freely relative to the valve main body, the spool including, from the first side to the second side, a first land, a groove that is formed adjacent to the first land, and a second land that is formed adjacent to the groove.

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Tokoname, Japan

Masaya Nakai