# US 4,393,823 A · Suction valve seat lubricating apparatus

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- Number: US 4,393,823 A
- Document ID: US4393823A
- Status: Granted
- Kind: A
- Application number: 06/275,103
- Filed: 1981-06-18
- Granted: 1983-07-19
- Earliest claimed: 1980-06-25
- Assignees: Kabushiki Kaisha Komatsu Seisakusho
- Inventors: Hideo Furukawa; Kazuo Chikugo; Yoichi Otsuki
- Web page: https://patentgrep.com/patent/US4393823A

## CPC

- F02M 35/1042: {characterised by provisions to avoid mixture or air supply from one plenum chamber to two successively firing cylinders}
- F01M 1/00: Pressure lubrication
- F02M 35/10124: {Ducts with special cross-sections, e.g. non-circular cross-section}
- F02M 35/10157: {Supercharged engines}
- F02M 35/10183: {Engines having intake ducts fed from a separate carburettor or injector, the idling system being considered as a separate carburettor}
- F02B 3/06: with compression ignition (compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02)
- F02B 2075/1824: {six}
- Y02T 10/12: Improving ICE efficiencies
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A suction valve seat lubricating apparatus for a multi-cylinder diesel engine wherein a small amount of lubricant is introduced into a suction manifold and it is carried by the compressed suction air to suction valve seats to lubricate them. A partition wall is disposed within the suction manifold for dividing the same into two chambers. Each chamber has a lubricant supply nozzle connected thereto.

## Claims

### Claim 1

In a diesel engine including a plurality of cylinders, a turbocharger, a compressor driven by the turbocharger for compressing a suction air, a suction manifold connected to the compressor, a plurality of cylinder heads each having a suction port and a valve insert with a valve seat formed therein, each suction port being connected to the suction manifold and a plurality of suction valves each adapted to intermittently seat on the respective valve seats wherein said cylinders are divided into first and second groups each group having a plurality of cylinders with different phase of suction strokes from one to another and having no overlap therebetween; a suction valve seat lubricating apparatus comprising a partition wall disposed in said suction manifold dividing the same into first and second chambers, said first chamber being communicated with said first group of cylinders and said second chamber being communicated with said second group of cylinders, and a pair of lubricant supply means each connected to and open within said first or second chamber for supplying lubricant thereinto whereby supplied lubricant may be carried by the suction air to the respective valve seats sequentially so as to lubricate the same.

### Claim 2 (depends on 1)

A suction valve seat lubricating apparatus as recited in claim 1 wherein each of said lubricant supply means is in the form of nozzle and lubricant pressure at the nozzle is higher than the suction air pressure at the nozzle.