Device and method for adjusting fuel supply advance angle of multi-cylinder diesel engine

Patent metadata

Field	Value
Publication number	US-9926855-B2
Application number	US-201515316757-A
Country	US
Kind code	B2
Filing date	Jun 1, 2015
Priority date	Sep 10, 2014
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A device and method for adjusting a fuel supply advance angle of a multi-cylinder diesel engine includes a gear chamber, a connecting disc and a fuel pump, wherein the gear chamber and the connecting disc are in the diesel engine, and the fuel pump is at a left end surface outside the gear chamber. A main shaft end of the fuel pump extends into the gear chamber. A right end surface of the connecting disc connects to a timing gear. A right end surface of the timing gear has three penetrating circular-arc waist-shaped holes. Annular sizing blocks are arranged on the waist-shaped holes. A penetrating circular hole is at a tail end of the waist-shaped holes. The circular hole is provided with a T-shaped nut. A support screw is arranged in the T-shaped nut, and the screw head of the support screw is jacked against the annular sizing block.

First claim

What is claimed is:

1. A device for adjusting a fuel supply advance angle of a multi-cylinder diesel engine, comprising a gear chamber, a connecting disc and a high-pressure fuel pump, the gear chamber and the connecting disc being assembled in the multi-cylinder diesel engine, the high-pressure fuel pump being arranged at a left end surface outside the gear chamber, and a main shaft end of the high-pressure fuel pump extending into the gear chamber and being fixedly connected to the connecting disc, wherein a right end surface of the connecting disc is fixedly connected to a timing gear of a fuel injection pump; a right end surface of the timing gear of the fuel injection pump is provided with three penetrating circular-arc waist-shaped holes that are away from the center and equally spaced along the circumference direction; annular sizing blocks are arranged on the waist-shaped holes; securing screws pass through the annular sizing blocks and the waist-shaped holes to fixedly connect the timing gear of the fuel injection pump to the right end surface of the connecting disc; a penetrating circular hole is arranged at a tail end of at least one waist-shaped hole of the circular-arc waist-shaped holes arranged on the right end surface of the timing gear of the fuel injection pump in a counterclockwise direction and away from the waist-shaped hole; the circular hole is provided with a T-shaped nut, and the axis of the T-shaped nut is in parallel with the end surface of the timing gear of the fuel injection pump; and a support screw is arranged in the T-shaped nut, and the screw head of the support screw is jacked against the annular sizing block.

2. The device for adjusting a fuel supply advance angle of a multi-cylinder diesel engine according to claim 1 , wherein the connecting disc has a step-shaped disc structure, and the timing gear of the fuel injection pump is arranged on the step of the connecting disc.

3. The device for adjusting a fuel supply advance angle of a multi-cylinder diesel engine according to claim 1 , wherein the radian of the waist-shaped holes is not greater than 30°.

4. The device for adjusting a fuel supply advance angle of a multi-cylinder diesel engine according to claim 1 , wherein a positioning blind hole for supporting the support screw is provided on the outer circumference of the annular sizing block.

5. The device for adjusting a fuel supply advance angle of a multi-cylinder diesel engine according to claim 1 , wherein a locking nut is provided on the support screw.

6. The device for adjusting a fuel supply advance angle of a multi-cylinder diesel engine according to claim 1 , wherein a counter bore is provided on a lower end surface of a penetrating circular hole formed on the end surface of the timing gear of the fuel injection pump.

7. An adjusting method applied by the device for adjusting a fuel supply advance angle of a multi-cylinder diesel engine according to claim 1 , the method comprising the following steps:
(1) preparation before adjustment: removing a cylinder head cover and an advancer cover of the diesel engine, disconnecting a high-pressure fuel pipe joint of a first cylinder of the high-pressure fuel pump, and supplying fuel to the high-pressure fuel pump and exhausting gas;
(2) setting of a fuel supply advance angle: rotating a crank pulley, observing that an intake valve and an exhaust valve of the diesel engine are in a closed state, and before a piston is pressed to reach the top dead center, keeping an advance angle index aligned with an advance angle pointer on the crank pulley at an angle specified in the specification of the diesel engine;
(3) adjustment of a fuel supply start point of a first cylinder plunger of the high-pressure fuel pump: loosening the support screw and the securing screws on the timing gear of the fuel injection pump, locking the timing gear of the fuel injection pump by using a crankshaft timing gear, repeatedly swinging the main shaft of the high-pressure fuel pump by using a nut at the top of the main shaft of the high-pressure fuel pump, checking, at a fuel supply port of the high-pressure fuel pump, a fuel outlet start position of the first cylinder plunger when the main shaft of the high-pressure fuel pump rotates in a clockwise direction, and tightening the securing screws of the timing gear of the fuel injection pump after the position is determined;
(4) checking of the fuel supply advance angle: repeatedly rotating the crank pulley before and after the fuel supply advance angle is reached, and checking, at the fuel supply port of the high-pressure fuel pump, the advance angle index corresponding to the advancer pointer on the crank pulley when the crank pulley rotates in a clockwise direction and the first cylinder plunger of the high-pressure fuel pump starts fuel outlet, the corresponding index being the fuel supply advance angle of the diesel engine; when the fuel supply advance angle is different from the angle set in Step (2), readjusting according to Step (3); and when the fuel supply advance angle is the same as the angle set in Step (2), supporting the support screw in the positioning hole of the annular sizing block, and locking the support screw by using the locking nut, thereby locking the fuel supply advance angle of the diesel engine; and
(5) resetting: reinstalling and fixing the cylinder head cover and the advancer cover of the diesel engine, and reinstalling the high-pressure fuel pipe joint of the first cylinder of the high-pressure fuel pump onto the fuel supply port, such that the setting of the fuel supply advance angle is completed.

Assignees

• Univ Jiangsu Science & Tech

Inventors

• Zhang Jian
• Tang Wenxian
• Yan Fei
• Su Shijie
• Li Qinfeng
• Qi Jiyang
• Zhu Yongmei
• Liu Yan
• Yao Kai

Classifications

• F02D1/162

  by mechanical means dependent on engine speed for angular adjustment of driving and driven shafts · CPC title

• F02D1/16 Primary

  Adjustment of injection timing (F02D1/02 takes precedence) · CPC title

• F02M2200/8092

  adjusting or calibration · CPC title

• F02M59/48

  Assembling; Disassembling; Replacing · CPC title

• F02M39/02

  Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives · CPC title