Yanmar Co., Ltd.

Masamichi Tanaka

Satoshi Hattori

Hajimu Imanaka

Junichi Samo

Tohru Ogawa

Hiroyuki Machiyama

Seiji Itsuki

Yoshihiro Yokome

A fuel injection pump provided with a diesel engine having a starter started up by a key switch. The fuel injection pump comprises a cold start device having a sparking actuator, the starter and the sparking actuator. The fuel injection pump includes an activator that activates the sparking actuator whenever the key switch is switched on.

Cold start device for fuel injection pump

A fuel injection pumpcomprises a thermoelement CSDfor advancing injection timing in a cold temperature condition. The CSDuses a pistonfor opening and closing a sub portformed in a plunger barrelAn electronic governoris provided with a mechanism for decreasing an injected fuel quantity when an engine starts in a cold temperature condition. The mechanism shifts a rack position in a fuel-decrease direction in a cold temperature condition, and switches the rack position to a normal position in a normal temperature condition. A timing TR for shifting the rack position is set before or simultaneous to a timing TC for switch-off of the CSD

Fuel injection pump

A fuel injection pump comprises: a barrel formed with a main portand a sub port; a plunger; and a CSDincluding an injection-advancing actuatorwhich operates a pistonfor opening or closing sub portso as to change an injection timing. Plungeris moved to connect or separate sub portand main portto and from a fuel compression chamber. The barrel is further formed with at least one exclusive overflowing sub portconstantly opened regardless of the operational state of the piston

Fuel injection pump with cold start device

In an injection control device for a fuel injection pump comprising: a water temperature sensor; a cold start device (CSD) for advancing a fuel injection timing to an engine when started up in a low temperature; and a controller, the controller recognizes a value T of water temperature by a signal from the water temperature sensor, and activates the CSD when the engine is started up and when the value of water temperature recognized by the controller (recognized value T of water temperature) is lower than a threshold value Tc of water temperature. If a value V of voltage of a power source of the controller becomes lower than a threshold value Vn of the voltage of the power source during activation of the CSD, a value Tn of water temperature recognized by the controller immediately before the value of voltage of the power source becomes lower than the threshold value of voltage of the power source is maintained as the value T of water temperature recognized by the controller for activating the cold start device.

Injection control device for fuel injection pump

A control mechanism for a fuel injection pump comprises: an electronic governor which actuates a rack actuator by a controller for controlling a governing rack; and a cold start device which actuates an injection-quickening actuator by the controller for opening or closing a draining sub port formed in a plunger barrel so as to advance injection timing when an engine is cold. Different settings about control degree of the governing rack controlled by the controller are prepared for a case where the injection-quickening actuator is actuated to switch on the cold start device (as characteristic curve), and for a case where the injection-quickening actuator is disactuated to switch off the cold start device (as characteristic curve), respectively.

Control mechanism for fuel injection pump

A fuel injection pump, comprising three sub-mechanism parts; a lower mechanism part (A), a head mechanism part (B), and a governor mechanism part (C), wherein, when the governor mechanism part (C) is assembled into the combination of the lower mechanism part (A) and head mechanism part (B) after the lower mechanism part (A) and head mechanism part (B) are assembled with each other, a governor link () installed extendedly from the governor mechanism part (C) is inserted into both mechanism parts (A, B) and, when a hook groove () at the tip of the governor link () is engaged with a lock pin () in a control slider () for the rotation of a plunger () disposed inside the lower mechanism part (A) and head mechanism part (B), first, with a cut surface () of a lift pin () facing upward, the governor link () is put on the cut surface () so as to position the hook groove () under the lock pin (), and then the lift pin () is rotated to face the cut surface () downward, and the governor link () is swung upward by a cam part () so as to engage the hook groove () with the lock pin ().

A start assister () of a fuel injection pump, comprising a piston () inlayed into a housing (H), an upper chamber () formed over the piston (), lower chamber () formed under the piston (), wherein a sub port () is opened and closed by sliding of the piston (), and a fuel injection timing is advanced by closing the sub port (). A thermo-element () for sliding the piston is arranged on one side of the piston () in sliding direction. A telescopic pin () of the thermo-element () is arranged in a low-pressure chamber () divided into the upper chamber and the lower chamber, and a connection pin () is interposed between the telescopic pin () and the piston ().

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Osaka, Japan

Masamichi Tanaka