Honda Motor Co., Ltd.

Yamada Manufacturing Co., Ltd.

Satoshi Ino

Noriyuki Kawamata

Toshimasa Mitsubori

Junichi Miyajima

Hayato Maehara

Eisuke Kajihara

Keiichi Kai

Norihiko Gogami

Akifumi Nomura

Kenichi Ohmori

Takahiro Matsuoka

Masafumi Taki

Kazuhiro Takeuchi

Kazuyuki Nakai

Yasunori Ono

Shinichi Wagatsuma

Kazuya Tanabe

Hiroki Hosoe

Yusuke Marui

An oil pump unit with a variable flow rate includes: an oil pump having an intake port and a discharge port and accommodating a pump rotor; and an oil path switching valve having oil inlets and oil outlets and opening/closing oil pressure return holes communicating with the discharge port, in which the oil path switching valve and the oil pump are separately disposed, the intake port and the discharge port are open to valve-mounting surfaces formed at the oil pump, and oil inlets and the oil outlet are open to body-mounting surfaces matching with the valve-mounting surfaces of the oil path switching valve.

Oil pump unit with variable flow rate

The engine with a variable flow rate oil pump includes a subsidiary relief passage that extends from an oil passage-switching valve to a subsidiary oil pump, a main relief passage that extends from the oil passage-switching valve to the main oil pump separately from the subsidiary relief passage, and a check valve that is provided in the subsidiary discharge passage and cuts off the flow of oil from the main discharge passage side to the oil passage-switching valve side. The oil passage-switching valve has a main pressure-adjusting chamber for the main oil pump, a subsidiary pressure-adjusting chamber of for the subsidiary oil pump, and a spool valve that performs partitioning between the main pressure-adjusting chamber and the subsidiary pressure-adjusting chamber.

Engine with variable flow rate oil pump

In an engine having an oil pump wherein an oil filter is incorporated into the oil pump without allowing the oil pump to become large in size. An oil pump and a hydraulic line changeover valve including a spool valve are disposed so as to have axes extending in parallel with each other. The oil pump has a plate-shaped oil filter disposed at a discharge port thereof. The plate-shaped oil filter is curved arcuately along an outer periphery of a pump rotor as viewed from a pump axial direction.

Engine having oil pump

An oil pump unit with a variable flow rate includes lubrication pumps and a control pump that are driven by rotation of a crankshaft of an engine, and changes an oil supply amount from the control pump to each part of the engine, in which the control pump includes a plurality of oil pumps that have different discharge rates.

An internal combustion engine includes a crankshaft, a variable flow rate oil pump apparatus including oil pumps having a drive shaft thereof operatively connected with the crankshaft, and a rod-shaped oil passage switching valve operatively connected with the oil pumps. The oil passage switching valve and the drive shaft of the oil pumps are arranged such that axial directions thereof are parallel to an axial direction of the crankshaft. Also, the oil pumps and the oil passage switching valve are disposed so as to overlap each other in the axial direction of the crankshaft. With such configuration of the engine, the effect on various components around the pump can be reduced, while downsizing the oil pump and the engine.

Internal combustion engine with variable flow rate oil pump apparatus, and motorcycle incorporating same

A piston with transverse-rib through holes formed easily therein for reducing the cost of manufacturing. A piston includes a pair of mutually opposed longitudinal ribs individually formed with piston pin bosses interconnecting a pair of piston skirt portions on a back side of a piston head. A pair of transverse ribs interconnect the mutually opposed longitudinal ribs with the transverse ribs. The pair of transverse ribs are formed with transverse-rib through holes at places proximal to the back side of the piston head. A skirt opening is formed by cutting away a part of the piston skirt portion that is opposed to the transverse rib and faces the transverse-rib through hole.

Piston

Growing community of inventors

Wako, Japan

Satoshi Ino