Engine reciprocative rotating mechanism and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2019120317-A1
Application number	US-201816165756-A
Country	US
Kind code	A1
Filing date	Oct 19, 2018
Priority date	Oct 25, 2017
Publication date	Apr 25, 2019
Grant date	—

Abstract

A second dynamic vibration absorber is higher in resonance frequency than a first dynamic vibration absorber. At least one of the resonance frequency of the first dynamic vibration absorber or the resonance frequency of the second dynamic vibration absorber is shifted from associated at least one of the first resonance frequency or the second resonance frequency such that a peak frequency of antiresonance occurring in a higher frequency region of the first dynamic vibration absorber than the resonance frequency of the first dynamic vibration absorber is substantially different from that of antiresonance occurring in a lower frequency region of the second dynamic vibration absorber than the resonance frequency of the second dynamic vibration absorber.

First claim

What is claimed is:

1 . An engine reciprocative rotation mechanism, comprising:
a piston reciprocating in a cylinder; a connecting rod connecting the piston and a crankshaft together; a first dynamic vibration absorber provided to the piston or the connecting rod, and configured to reduce a vibration level, which is generated during an operation of the engine, at a first resonance frequency; and a second dynamic vibration absorber provided to the piston or the connecting rod, and configured to reduce a vibration level, which is generated during the operation of the engine, at a second resonance frequency higher than the first resonance frequency, wherein the second dynamic vibration absorber is higher in resonance frequency than the first dynamic vibration absorber, and at least one of the resonance frequency of the first dynamic vibration absorber or the resonance frequency of the second dynamic vibration absorber is shifted from associated at least one of the first resonance frequency or the second resonance frequency such that a peak frequency of antiresonance occurring in a higher frequency region of the first dynamic vibration absorber than the resonance frequency of the first dynamic vibration absorber is substantially different from that of antiresonance occurring in a lower frequency region of the second dynamic vibration absorber than the resonance frequency of the second dynamic vibration absorber.

2 . The engine reciprocative rotation mechanism of claim 1 , further comprising:
a piston pin connecting the piston and the crankshaft together, and having a through hole, wherein the first and second dynamic vibration absorbers are disposed in the through hole of the piston pin.

3 . The engine reciprocative rotation mechanism of claim 1 , wherein
at least one of the resonance frequency of the first dynamic vibration absorber or the resonance frequency of the second dynamic vibration absorber is shifted from associated at least one of the first resonance frequency or the second resonance frequency such that the peak frequency of antiresonance occurring in the higher frequency region of the first dynamic vibration absorber than the resonance frequency of the first dynamic vibration absorber is higher than that of antiresonance occurring in the lower frequency region of the second dynamic vibration absorber than the resonance frequency of the second dynamic vibration absorber.

4 . The engine reciprocative rotation mechanism of claim 2 , further comprising:
a fixture fixing the first and second dynamic vibration absorbers to the piston pin and common to the first and second dynamic vibration absorbers, a first connecter elastically connecting the fixture and the first dynamic vibration absorber together, and a second connecter elastically connecting the fixture and the second dynamic vibration absorber together.

5 . A method for manufacturing an engine reciprocative rotation mechanism which includes:
a piston reciprocating in a cylinder; a connecting rod connecting the piston and a crankshaft together; a first dynamic vibration absorber provided to the piston or the connecting rod, and configured to reduce a vibration level, which is generated during an operation of the engine, at a first resonance frequency; and a second dynamic vibration absorber provided to the piston or the connecting rod, and configured to reduce a vibration level, which is generated during the operation of the engine, at a second resonance frequency, the second dynamic vibration absorber being higher in resonance frequency than the first dynamic vibration absorber, the method comprising: a preparing step of preparing the first and second dynamic vibration absorbers, the preparing step including a shifting step of shifting at least one of the resonance frequency of the first dynamic vibration absorber or the resonance frequency of the second dynamic vibration absorber from associated at least one of the first resonance frequency or the second resonance frequency when a peak frequency of antiresonance occurring in a higher frequency region of the first dynamic vibration absorber than the resonance frequency of the first dynamic vibration absorber is substantially consistent with that of antiresonance occurring in a lower frequency region of the second dynamic vibration absorber than the resonance frequency of the second dynamic vibration absorber.

6 . The method of claim 5 , wherein
the shifting step from the associated one of the first resonance frequency or the second resonance frequency is a step of shifting at least one of the resonance frequency of the first dynamic vibration absorber or the resonance frequency of the second dynamic vibration absorber from associated at least one of the first resonance frequency or the second resonance frequency to associated at least one of the higher frequency region or the lower frequency region.

7 . The method of claim 5 , wherein
the first and second dynamic vibration absorbers each have a body, a fixture fixed to the piston or the piston pin, and a connecter elastically connecting the body and the fixture together, the preparing step further includes a changing step of changing at least one of a ratio of a mass of the body of the first dynamic vibration absorber to a reciprocating inertial mass of the reciprocative rotation mechanism or a ratio of a mass of the body of the second dynamic vibration absorber to the reciprocating inertial mass of the reciprocative rotation mechanism, thereby changing associated at least one of an interval of two types of antiresonance occurring in the first dynamic vibration absorber or an interval of two types of antiresonance occurring in the second dynamic vibration absorber.

Assignees

• Mazda Motor

Inventors

• Nagato Kiyonori
• Kikuchi Takuya
• Mori Tsunehiro
• Hirata Koichi
• Sumitani Akira
• Yamada Rumiko
• Morishima Toru
• Enokizono Rei
• Shirasuna Yuichi

Classifications

• F16F2226/04

  Assembly or fixing methods; methods to form or fashion parts · CPC title

• F16J1/16

  with gudgeon-pin; Gudgeon-pins · CPC title

• F16C7/023

  for piston engines, pumps or the like · CPC title

• F16F2224/0208

  Alloys · CPC title

• F16F7/116

  on metal springs · CPC title