Piston cooling system

Patent metadata

Field	Value
Publication number	US-8967093-B2
Application number	US-201414187652-A
Country	US
Kind code	B2
Filing date	Feb 24, 2014
Priority date	Feb 28, 2013
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

A piston cooling system includes: a nozzle pipe portion which communicates with an oil passage which is provided in an internal combustion engine and which extends towards an interior of a cylinder bore; and a flow path forming member which is fixed to a distal end portion of the nozzle pipe portion and in which a plurality of oil jetting paths are formed, wherein: the distal end portion comprises an expanded pipe portion where the nozzle pipe portion is expanded and the flow path forming member is fittingly inserted into the expanded pipe portion; the flow path forming member has a distal end face which is exposed to an exterior portion at a distal end side of the expanded pipe portion; and the flow path forming member is locked in the expanded pipe portion by deforming a distal end edge of the expanded pipe portion.

First claim

What is claimed is:

1. A piston cooling system comprising:
a nozzle pipe portion which communicates with an oil passage which is provided in an internal combustion engine and which extends towards an interior of a cylinder bore; and
a flow path forming member which is fixed to a distal end portion of the nozzle pipe portion and in which a plurality of oil jetting paths are formed to thereby cool a piston within the cylinder bore by jetting oil from the oil jetting paths towards a back side of the piston, wherein:
the distal end portion comprises an expanded pipe portion where the nozzle pipe portion is expanded and the flow path forming member is fittingly inserted into the expanded pipe portion;
the flow path forming member has a distal end face which is exposed to an exterior portion at a distal end side of the expanded pipe portion; and
the flow path forming member is locked in the expanded pipe portion by deforming a distal end edge of the expanded pipe portion so as to provide a locking portion which locks the distal end face of the flow path forming member.

2. The piston cooling system according to claim 1 , wherein
the distal end edge of the expanded pipe portion projects further towards the distal end side of the expanded pipe portion than the distal end face of the flow path forming member in such a state that the flow path forming member is inserted into the expanded pipe portion.

3. The piston cooling system according to claim 1 , wherein:
the expanded pipe portion has a tapered inner circumferential wall surface which is formed so as to gradually expand towards the distal end edge;
the flow path forming member has a tapered outer circumferential wall surface which corresponds to the inner circumferential wall surface and groove portions are formed in the outer circumferential wall surface; and
the oil jetting paths are formed by the inner circumferential wall surface and the groove portions.

4. The piston cooling system according to claim 3 , wherein
the nozzle pipe portion is formed of a metal, and a tapered angle of the inner circumferential wall surface of the expanded pipe portion is less than 30 degrees with respect to an axis of the nozzle pipe portion.

5. The piston cooling system according to claim 3 , wherein
a rotation restricting portion which restricts a rotational movement of the flow path forming member around an axis of the expanded pipe portion is formed between the inner circumferential wall surface of the expanded pipe portion and the outer circumferential wall surface of the flow path forming member.

6. The piston cooling system according to claim 1 , wherein
the flow path forming member is formed from a synthetic resin.

7. The piston cooling system according to claim 1 , wherein:
the flow path forming member is locked in the expanded pipe portion by the locking portion which is provided at a circumferential portion on the distal end edge; and
the locking portion is positioned to deviate from the oil jetting paths in a circumferential direction of the distal end edge.

8. The piston cooling system according to claim 1 , wherein:
a spark plug and an exhaust port face a combustion chamber which is defined by the cylinder bore and the piston; and
the oil jetting paths include at least a first oil jetting path which jets oil towards a close-to-spark-plug portion on the back side of the piston and a second oil jetting path which jets oil towards a close-to-exhaust-port portion on the back side of the piston.

9. The piston cooling system according to claim 1 , wherein
an identification portion which identifies a fittingly inserting orientation of the flow path forming member around the axis of the expanded pipe portion is provided on the distal end face so as to be depressed thereinto or project therefrom.

10. The piston cooling system according to claim 1 , wherein
the locking portion on the distal end edge is formed through at least either crimping or bending.

Assignees

• Honda Motor Co Ltd
• Hikari Seiko

Inventors

• Gokan Yoshitsugu
• Nishimura Kenichi
• Yamamoto Keiji
• Sabato Masaki

Classifications

• F02F3/22

  the fluid being liquid · CPC title

• F01P3/08 Primary

  Cooling of piston exterior only, e.g. by jets · CPC title