Nissin Kogyo Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Kabushiki Kaisha Honda Lock

Nissin Kogyo Kabushiki Kaisha

Nissin Nogyo Co., Ltd.

Naotoshi Tamai

Atsushi Shimizu

Yoichi Sugimoto

Takashi Aoki

Yoshihiro Iwagawa

Motoyasu Nakamura

Etsuo Fujii

Takuro Kodama

Takaomi Shirase

Kougyoku Go

Naoki Masuda

Jun Yamashita

Takeshi Taniguchi

Tsutomu Kurita

Tsutomu Amano

Kazuhiro Ohta

Akira Fujimoto

Tomohide Tanaka

Takuya Maruo

Makoto Kikuchi

Takaomi Sirase

A plunger pump, includes: a plunger pump unit including a pump chamber and a plunger for pressing a hydraulic fluid in the pump chamber to perform a discharging operation of the hydraulic fluid; a motor; and a cam portion driven by the motor to rotate and press the plunger. The cam portion has at least two discharge regions for pressing the plunger and a suction region formed between the discharge region. The plunger performs the discharging operation two times or more by one rotation of the cam portion.

Plunger pump

An electromagnetic valve is fitted with relief means and is made to have a compact diameter without increasing its axial length is provided. The electromagnetic valve is provided with a push bar capable of pushing the valve body toward the valve seat and a relief spring for urging the push bar toward the valve body are contained in a guide hole formed in the central portion of the moving core, wherein a stopper is provided to the moving core, the stopper being used for holding the valve body open by defining a limit to which the push bar is moved forward with respect to the valve body when the moving core is moved backward and for allowing the valve body to be closed by the relief spring when the moving core is moved forward. Thus, the valve body and the push bar are axially arranged separately from each other.

Electromagnetic valve

A pump actuation motor includes a yoke (15), a rotation shaft (12) that has, on one end side, a supported shaft portion (12d) that is inserted into and supported by a block body (9) and an eccentric shaft portion (12c) that actuates the plunger pumps (5) and (6) and, on the other end side, a rotor and a commutator (22) attached therearound, a brush holder (23) that holds a brush (24) that can supply electric power from-the block body (9) side to the commutator (22), and a housing (26) that is so mounted between the yoke (15) and the block body (9)side as to cover an opening of such yoke (15), wherein the rotation shaft (12) includes a recessed portion (12a) that opens on an end surface of the other end side while the yoke (15) includes a protruding portion 15a that protrudes into the recessed portion (12a) that is formed as a part of such yoke (15), and the other end side of the rotation shaft (12) is supported by such protruding portion (15a).

Pump actuation motor for automotive antilock brake system

Electromagnetic valve device

A hydraulic pressure controller includes: a base; a n electromagnetic valve mounted on the base and including a guide cylinder protruding from the base, a coil unit having a bobbin surrounding the guide cylinder and a coil wound on the bobbin, and a magnetic path forming frame connecting magnetically a first end and a second end of the guide cylinder; a reservoir and a damper arranged with the electromagnetic valve on the base; and a cover covering the electromagnetic valve, the reservoir and the damper, in which the cover includes a frame coupled to the base, the frame surrounding the electromagnetic valve, and a skirt portion formed integrally with the frame, the skirt portion covering the reservoir and the damper. The hydraulic pressure controller is light in weight and is improved in assembling efficiency. The hydraulic pressure controller has a reservoir water-proofing structure which is capable of preventing water from entering an outside air communicating chamber of the reservoir.

Hydraulic pressure controller and reservoir water-proofing structure

In a hydraulic apparatus providing a base with a discharge passage coupler to a circumferential portion of an annular discharge passage and to a damper chamber, a hydraulic device is connected via an orifice to the discharge passage without arranging the annular discharge passage between the damper chamber and the orifices, so that the damper chamber and the orifices cooperate together to exert an effective attenuating action thereon so as to suppress the transfer of pressure pulsation thereto effectively. Further, in an anti-lock brake control apparatus providing a pipe member which integrally includes an orifice interposed between a damper and a normally open electromagnetic valve, a sheet pipe corrected to an inner end of a connecting hole coaxially with the orifice, and a coupling pipe portion coaxially formed between the orifice and the sheet pipe, the sheet pipe is fitted into a large-diameter portion of the base and the orifice is fitted into a small-diameter portion of the base, thus the number of component parts is reduced and the normally open electromagnetic valves are prevented from malfunctioning due to the clogging of the orifices by dust.

Hydraulic apparatus and anti-lock brake control apparatus for a vehicle

In a hydraulic braking pressure control system for a rear wheel brake wherein a control piston normally works to provide a hydraulic braking pressure control by cooperation with a cut-off valve interposed between an input chamber leading to a master cylinder and an output chamber leading to a wheel cylinder of the brake, the cut-off valve has a valve seat piston whose pressure-receiving area facing the output chamber is larger than the pressure-receiving area facing the output chamber. This ensures that opening and closing of the cut-off valve can be repeated in accordance with the output pressure from the master cylinder, so that the output pressure from the master cylinder can be reduced and applied to the brake wheel cylinder. When the control hydraulic pressure is lost, the control piston and sleeve can be moved in a direction to increase the volume of the output chamber thereby to close the lock valve and tightly close a control chamber between the control piston and sleeve, while restraining by a stopper the movement of the cut-off valve following in a closing direction of the control piston and sleeve. This makes it possible to insure a hydraulic braking pressure applied to the brake wheel cylinder.

Hydraulic braking pressure control system for rear wheel brake

A hydraulic braking pressure control system which includes a sleeve slidably received in a housing with opposite ends facing an output chamber connected to a brake device, and a pilot chamber connected to a control hydraulic pressure source. A control piston is slidably received in the sleeve, with one end of the control piston facing the output chamber and the other end facing a control chamber connected to the control hydraulic pressure source through a lock valve which is adapted to be closed in response to the movement of the sleeve, in a direction to increase the volume of the output chamber. A cut-off valve located between an input chamber leading to a master cylinder and the output chamber includes a valve member having a maximum amount of movement in a seating direction which is regulated to a position of the valve member spaced apart from a valve seat when a valve seat member follows movement of the sleeve in a direction to reduce the volume of the pilot chamber to the maximum amount. This ensures that the opening of the cut-off valve and tight closing of the control chamber upon an abnormal reduction of the control hydraulic pressure from the control hydraulic pressure reduction source can be achieved with a simplified system.

Hydraulic braking pressure control system

Growing community of inventors

Nagano, Japan

Naotoshi Tamai