Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hitachi, Ltd.

Shigehiko Omata

Moritsugu Akiyama

Shigenori Nakazato

Satoshi Usui

Masato Saito

Yoshiaki Nagasawa

Masashi Nemoto

Shuichi Kokubun

Hiroyuki Yamada

Kenichiro Tokuo

Masanori Watanabe

Takashi Suzuki

Minoru Hashida

Shunsuke Aritomi

Shigeru Yumiyama

Koji Harada

Atsushi Takaoku

Katsutoshi Kobayashi

Kenichirou Tokuo

Shigenori Tahara

Atsushi Saeki

Hiroyasu Kuniyoshi

Norio Yanagawa

Shingo Kitajima

Takanori Oginuma

Mitsuhiro Arai

Shouta Ohkoshi

Yoshinobu Nakamura

The present invention provides a fuel pump capable of preventing the occurrence of cavitation near a seat member in a valve mechanism. The fuel pump includes a plunger adapted to reciprocate, a pressurizing chamber adapted to increase and decrease its volumetric capacity through the reciprocation of the plunger, and a relief valve mechanism adapted to return a fuel to the pressurizing chamber. The relief valve mechanism includes a relief valve, and a seat member having a valve contact portion for seating the relief valve thereon. The relief valve is disposed closer to the plunger than the seat member. The seat member has an annular groove portion which forms a space communicating with the pressurizing chamber, between the annular groove portion and a second chamber (a fixing portion) surrounding the outer peripheral surface of the seat member. The space is provided at a position farther from the plunger than the valve contact portion.

Fuel pump

Provided is a high-pressure fuel pump that ensures oil tightness even at high fuel pressure and has a small and lightweight inexpensive discharge valve structure. Therefore, a high-pressure fuel pump according to the present invention includes: a discharge valve arranged on a discharge side of a pressurizing chamber; a discharge valve seat on which the discharge valve is seated; and a facing member configured independently as a separate member from the discharge valve seat and located on an opposite side of the discharge valve seat with the discharge valve interposed therebetween, in which a stroke direction regulating portion that regulates displacement of the discharge valve in a stroke direction is formed on a tapered surface of the facing member.

High-pressure fuel pump

There is provided a discharge valve mechanism provided at an outlet of a pressurizing chamber of a high-pressure fuel supply pump that aims to reduce a backflow amount of fuel from a discharge valve and to prevent cavitation erosion. There are provided a discharge valve disposed on a discharge side of a pressurizing chamber, a discharge valve seat that closes a discharge side flow passage of the pressurizing chamber by seating the discharge valve, and a discharge valve spring that presses the discharge valve toward the discharge valve seat. It is configured such that, in a case where a minimum seat diameter of a seat portion in which the discharge valve is seated on the discharge valve seat is set to D and a spring force of the discharge valve spring at a time of setting is set to F, a coefficient K obtained by dividing the spring force F by the minimum seat diameter D is set to be 0.2 or more.

High-pressure fuel supply pump

An object is to suppress cavitation generated at a distal end portion of a seat face when a valve body and a seat portion collide with each other. In a relief valve of a fuel pump, an intersection between the seat face and a flow channel hole is formed at a position more distant than the seat portion formed of the valve body in a valve closing state and the seat face in order to suppress generation of cavitation bubbles when the valve body improves and releases high-pressure fuel.

The purpose of the present invention is to swiftly start up an engine in a range in which electrical equipment having electric power supplied thereto by a battery is not reset, even in cases when the battery is insufficiently charged and the battery is deteriorated. An engine start-up device according to the present invention starts up an engine by transmitting, to the engine, the rotary force of a direct-current motor driven by a battery. The engine start-up device is provided with: a battery-voltage acquisition unit for acquiring the battery voltage of the battery; a target-current-value calculation unit which calculates, on the basis of the battery voltage acquired by the battery-voltage acquisition unit, a target current value for a motor current to be supplied from the battery to the direct-current motor; and a motor-current control unit for controlling a switching element which is connected to the direct-current motor, and through which the motor current flows, such that the motor-current value of the motor current approaches the target current value.

Engine start-up device, and engine-start-up control method

Vehicle engine starting apparatus of automatically restarting an engine by quickly responding to a subsequent engine restart request even if engagement of a pinion gear with a ring gear is failed in the process of a stop of the engine. Pinion gear is displaced such that the pinion gear is engaged with the ring gear at a timing (when rotation speed of the pinion gear and rotation speed of the engine are nearly synchronized with each other with a signal from a control device when a predetermined condition is met. Where an engagement sensor has transmitted a signal 'H' indicating engagement failure, when restart of the engine becomes necessary, the pinion gear is displaced toward a ring gear side by the control device.

Vehicle engine starting apparatus

An engine starting apparatus is provided which can start an engine without inducing malfunctions of various electronic components. The engine starting apparatus comprises a pinion adapted to be brought into meshing engagement with a ring gear linked to an engine, a magnet switch supplied with current from a battery to move the pinion in the direction of the ring gear, a starter motor supplied with the current to rotate the pinion, a control unit for instructing the starter motor to start the engine, and a starter control unit for controlling, on the basis of the instruction, a first semiconductor switch subject to PWM control, wherein the starter motor and the magnet switch are stored in a first housing, the starter control unit is stored in a second housing, and the first housing is integral with the second housing.

Engine starting apparatus

Starter for vehicle-use engine which can detect a rotational speed signal in a stable manner even when a clutch cover is mounted on an outer periphery of a clutch outer of a one-way clutch. The starter D for a vehicle-use engine which transmits a rotational drive force of a stator to a ring gear of a crankshaft by a pinion of the starter includes: a one-way clutch which is arranged between the pinion and an armature shaft of the stator; and a rotational speed detection device which detects a rotational speed of the pinion. A part to be detected for a rotational speed is formed of through holes formed on a circumference of the clutch cover, and a circular circumferential groove formed on an outer peripheral surface of a clutch outer along the circumference on which the through holes are formed.

Starter having optical speed sensor on clutch outer periphery

A starter comprising: a shift lever for engaging and disengaging a pinion and a ring gear of an engine; a magnetic switch for actuating the shift lever; a motor for driving the pinion; a front case having an open end to which the magnetic switch and the motor are mounted substantially in the same direction, the pinion being enclosed in the front case; a seal portion provided in the vicinity of the open end of the front case so as to seal a gap which communicates between the inside and the outside of the front case; the seal portion including a taper face and an elastic material, the taper face having an axis of taper substantially perpendicular to the longitudinal axis of the motor, the elastic material being fitted onto the taper face so as to be disposed between the magnetic switch and the motor and so as to be urged in the direction along which a width of the taper face becomes narrower.

Starter having an elastic seal member shaped to taper in a direction

Growing community of inventors

Hitachinaka, Japan

Shigehiko Omata