# US 2016/0252007 A1 · Pre-chamber assembly for engine

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- Number: US 2016/0252007 A1
- Document ID: US20160252007A1
- Status: Published application
- Kind: A1
- Application number: 15/149,455
- Filed: 2016-05-09
- Published: 2016-09-01
- Earliest claimed: 2016-05-09
- Assignees: Caterpillar Inc.
- Applicants: Caterpillar Inc.
- Inventors: Xinyu Ge; Xinqiang Xu; Liang Wang
- Web page: https://patentgrep.com/patent/US20160252007A1

## CPC

- F02B 19/16: Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
- F02B 19/108: {with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber}
- F02B 19/12: with positive ignition (engines with non-timed positive ignition, and with incandescent chambers F02B9/08)
- F02B 43/00: Engines characterised by operating on gaseous fuels; Plants including such engines (engines characterised by the gas-air charge being ignited by compression ignition of an additional fuel F02B7/06; engines convertible from gas to other fuel consumption F02B69/04)
- F02M 21/02: for gaseous fuels
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/30: Use of alternative fuels, e.g. biofuels
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A pre-chamber assembly for an engine having a cylinder head defining a coolant passage is provided. The pre-chamber assembly includes a body member defining pre-combustion chamber received within the cylinder head, and a plurality of fins projecting radially from an outer surface of the body member. The plurality of fins includes a first set of fins proximate to the pre-combustion chamber, a second set of fins spaced apart from the first set of fins along a longitudinal axis, and a third set of fins disposed between the first set of fins and the second set of fins. A number of fins of the first set of fins is greater than a number of fins of the third set of fins, and the number of fins of the third set of fins is greater than a number of fins of the second set of fins.

## Claims

### Claim 1

A pre-chamber assembly for an engine having a cylinder head defining a coolant passage therein, the pre-chamber assembly comprising:
a body member received within the cylinder head, the body member having an inner surface and an outer surface facing the coolant passage of the cylinder head, the body member defining a pre-combustion chamber at an end portion thereof, wherein the pre-combustion chamber is in communication with a main combustion chamber of the engine through at least one orifice; and
a plurality of fins projecting radially from the outer surface of the body member, the plurality of fins being in contact with coolant received within the coolant passage of the cylinder head, each fin of the plurality of fins extends along a longitudinal axis of the body member, wherein the plurality of fins are positioned along the longitudinal axis of the body member in a predetermined pattern, the plurality of fins including:
a first set of fins provided on the outer surface of the body member and proximate to the pre-combustion chamber defined at the end portion of the body member;
a second set of fins provided on the outer surface of the body member and spaced apart from the first set of fins along the longitudinal axis; and
a third set of fins provided on the outer surface of the body member and disposed between the first set of fins and the second set of fins,
wherein a number of fins of the first set of fins is greater than a number of fins of the third set of fins, and the number of fins of the third set of fins is greater than a number of fins of the second set of fins.