Diesel Kiki Co., Ltd.

Kohki Iwata

Masayoshi Kobayashi

Keiichi Yamada

Toshio Yamaguchi

Hideyasu Takefuta

Toru Sakuranaka

Sachio Nakagawa

Ryuichi Komori

Masayasu Hayakawa

In a distribution type fuel injection system, the fuel injection advance angle, or the relative angular position at which fuel injection begins, is controlled by a first spring loaded piston (44). The spring force is opposed by pressurized fuel from a pump (14), the pressure increasing with engine speed. A second spring loaded piston (49) moves the first piston (44) to an advanced position for starting the engine and is retracted when the fuel pressure reaches a certain value to subsequently retard the advance angle in an idling speed range. The fuel pressure moves the first piston (44) to progressively advance the angle in a higher speed range. An electromagnetic valve (62) is controlled to trap fuel and apply a hydraulic lock to the second piston (49) during starting of the engine to prevent retarding of the advance angle until the engine speed or coolant temperature reaches a predetermined value.

Fuel injection advance angle control apparatus

Rotary input and output members (19), (28) are axially aligned with each other and a rotary clutch disc (32) is axially aligned with and frictionally engageable with the input member (19). A coil-wound spring (33) is wound around the input and output members (19), (28) and connected at its ends to the clutch disc (32) and output member (28) respectively. An electromagnetic coil (26), which energized, attracts the clutch disc (32) into frictional engagement with the input member (19) and causes the coil-wound spring (33) to tightly wind around and embrace the input and output members (19), (28), thereby drivingly connecting the same together. A sleeve (41) formed with a circumferential gap (41a) is disposed between the coil-wound spring (33) and the input member (19) which provides the clutch (11) with a desirable amount of slippage prior to full engagement, evenly distributes the radially inward force applied to the input and output members (19), (28 ) by the coil-wound spring (33) and prevents the coil-wound spring (33) from entering an axial space (42) between the input and output members (19), (28).

Electromagnetic spring-wound clutch

Growing community of inventors

Higashi Matsuyama, Japan

Kohki Iwata