Piston structure for engine

Patent metadata

Field	Value
Publication number	US-9926998-B2
Application number	US-201314421420-A
Country	US
Kind code	B2
Filing date	Aug 9, 2013
Priority date	Aug 29, 2012
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

An engine piston structure includes: a piston ( 1 ); a connecting rod ( 10 ) having a small end part ( 10 a ) coupled to the piston ( 1 ), and having a large end part ( 10 b ) coupled to a crankshaft; a piston pin ( 2 ) through which the piston ( 1 ) and the small end part ( 10 a ) of the connecting rod ( 10 ) are coupled together and which has a hollow cross section; and at least one dynamic vibration absorber ( 20 ) provided inside the piston pin ( 2 ) to reduce resonance of the piston ( 1 ), the piston pin ( 2 ), and the small end part ( 10 a ) of the connecting rod ( 10 ) in combination with respect to the large end part ( 10 b ) of the connecting rod ( 10 ) during a combustion stroke.

First claim

The invention claimed is:

1. An engine piston structure, comprising:
a piston configured to reciprocate in a cylinder;
a connecting rod having a small end part coupled to the piston, and having a large end part coupled to a crankshaft;
a piston pin through which the piston and the small end part of the connecting rod are coupled together and which has a hollow cross section; and
at least one dynamic vibration absorber provided inside the piston pin to reduce resonance of the piston, the piston pin, and the small end part of the connecting rod in combination with respect to the large end part of the connecting rod during a combustion stroke.

2. The engine piston structure of claim 1 , wherein
the at least one dynamic vibration absorber comprises two dynamic vibration absorbers provided inside the piston pin,
each dynamic vibration absorber has
a fixed portion fixed to the piston pin,
a movable portion extending inside the piston pin in a direction along a central axis of the piston pin, and
a supporting portion supporting the movable portion such that the movable portion is capable of vibrating with respect to the fixed portion along a diameter of the piston pin,

an outside diameter of the movable portion is determined such that if the movable portion vibrates, the movable portion would not be in contact with an inner surface of the piston pin, and
the two dynamic vibration absorbers are located at both sides of a plane that passes through a middle of the piston pin in the direction along the central axis of the piston pin and is perpendicular to the central axis of the piston pin.

3. The engine piston structure of claim 2 , wherein
masses of the movable portions of the two dynamic vibration absorbers are substantially equal to each other, and
the two dynamic vibration absorbers have different spring constants.

Assignees

• Mazda Motor

Inventors

• Kanda Yasunori
• Mori Tsunehiro
• Sudou Yasuhiro
• Kikuchi Masakazu
• Toyoda Kazuo
• Hanzawa Tetsuya
• Fukuda Yukiyoshi
• Sumitani Akira
• Koizumi Masahiro
• Hirata Koichi
• Takuma Shuji
• Kubo Kouji
• Nishimori Kazuya

Classifications

• F16C27/02

  Sliding-contact bearings · CPC title

• F16J1/16

  with gudgeon-pin; Gudgeon-pins · CPC title

• F16C9/04

  Connecting-rod bearings; Attachments thereof · CPC title

• F02F3/00 Primary

  Pistons · CPC title

• F16F15/04 Primary

  using elastic means (single elements or their attachment F16F1/00 - F16F13/00); {(F16F15/023, F16F15/03 take precedence)} · CPC title