Fuel Injection Pump

Patent metadata

Field	Value
Publication number	US-2020375477-A1
Application number	US-202016899564-A
Country	US
Kind code	A1
Filing date	Jun 11, 2020
Priority date	Nov 26, 2015
Publication date	Dec 3, 2020
Grant date	—

Abstract

A fuel injection pump for a diesel engine, including: a control rack an in a rack chamber formed between a pump head and a pump housing, and configured to adjust a fuel injection amount; a transmission shaft rotatably supported by a transmission shaft hole formed in the pump housing; and a lubricating oil passage formed in the pump housing, and configured to pressure-feed lubricating oil between the transmission shaft and the transmission shaft hole. The transmission shaft has an oil passage therein through which passage the lubricating oil pressure-fed to the lubricating oil passage partially passes, a first opening of the oil passage is communicated with the lubricating oil passage, and a second opening of the oil passage is formed on the outer circumferential surface of an upper portion of the transmission shaft, nearby the control rack.

First claim

What is claimed is:

1 . A fuel injection pump to be provided in an engine, comprising:
a transmission shaft supported by a pump housing, wherein the transmission shaft includes:
an oil passage,
and
an opening of the oil passage, wherein said opening is formed on an outermost circumferential surface of an upper portion of the transmission shaft.

2 . The fuel injection pump to be provided in an engine according to claim 1 , further comprising:
a lubricating oil passage formed in the pump housing, wherein the lubricating oil passage and the oil passage communicate through another opening separate from said opening.

3 . The fuel injection pump according to claim 2 , wherein the oil passage includes:
a groove formed in the outer circumferential surface of the transmission shaft in an axial direction thereof, the groove including said another opening; a communication path opened on a wall portion of the groove, and formed in a radial direction of the transmission shaft; and a supply hole communicated with the communication path and formed from substantially an axial center portion of the transmission shaft to said opening.

4 . The fuel injection pump according to claim 3 , wherein the groove has at least one side wall formed perpendicularly to the wall portion.

5 . The fuel injection pump according to claim 4 , wherein a lower end portion of an open portion of the groove is formed in a substantially U-shape.

6 . The fuel injection pump according to claim 2 , wherein the second opening is formed in a recess of an upper edge of the transmission shaft.

7 . The fuel injection pump according to claim 3 , wherein the first opening is defined by an overlap of a bottom portion of the groove and the lubricating oil passage.

Assignees

• Yanmar Power Technology Co Ltd

Inventors

• Nanko Masaki
• Shiba Yuji
• Okamoto Ryosuke
• Hattori Tetsu

Classifications

• F02M59/28 Primary

  Mechanisms therefor · CPC title

• F02M63/0001 Primary

  Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil (lubrication of engines F01M) · CPC title

• F02M59/44

  Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} · CPC title

• F02M59/102

  Mechanical drive, e.g. tappets or cams (F02M45/063 takes precedence) · CPC title

• F02M53/00

  Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means · CPC title