Engine reciprocative rotating mechanism and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2019120318-A1
Application number	US-201816165782-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 a ratio of a mass of a body of the first dynamic vibration absorber to a reciprocating inertial mass of the reciprocative rotation mechanism or a ratio of a mass of a body of the second dynamic vibration absorber to the reciprocating inertial mass of the reciprocative rotation mechanism is set 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 first and second dynamic vibration absorbers each have a body, a fixture fixed to the piston or the or the connecting rod, and a connecter elastically connecting the body and the fixture together, the second dynamic vibration absorber is higher in resonance frequency than the first dynamic vibration absorber, and if a mass including at least a mass of the piston, a mass of a part of the connecting rod, and a mass of the fixture is supposed to be a reciprocating inertial mass of the reciprocative rotation mechanism, at least one of a ratio of a mass of the body of the first dynamic vibration absorber to the 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 is set 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 , wherein
at least one of the ratio of the mass of the body of the first dynamic vibration absorber to the reciprocating inertial mass of the reciprocative rotation mechanism or the ratio of the mass of the body of the second dynamic vibration absorber to the reciprocating inertial mass of the reciprocative rotation mechanism is set such that the peak frequency of the 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 the antiresonance occurring in the lower frequency region of the second dynamic vibration absorber than the resonance frequency of the second dynamic vibration absorber.

3 . The engine reciprocative rotation mechanism of claim 1 , further comprising:
a piston pin connecting the piston and the connecting rod together, and having a through hole extending axially, wherein the fixture of the first dynamic vibration absorber is the fixture of the second dynamic vibration absorber, and the first and second dynamic vibration absorbers are disposed in the through hole of the piston pin.

4 . 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 first and second dynamic vibration absorbers each having a body, a fixture fixed to the piston or the connecting rod, and a spring connecting the body and the fixture together and having a predetermined spring constant, the second dynamic vibration absorber being higher in resonance frequency than the first dynamic vibration absorber, the method comprising, the method comprising: a step of preparing the first and second dynamic vibration absorbers, the step including a 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 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, thereby changing associated at least one of an interval between two types of the antiresonance occurring in the first dynamic vibration absorber or an interval between two types of the antiresonance occurring in the second dynamic vibration absorber, and allowing 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 to be substantially different from that of the antiresonance occurring in the lower frequency region of the second dynamic vibration absorber than the resonance frequency of the second dynamic vibration absorber.

5 . The method of claim 4 , wherein
in the step of changing at least one of the ratio of the mass of the body of the first dynamic vibration absorber to the reciprocating inertial mass of the reciprocative rotation mechanism or the ratio of the mass of the body of the second dynamic vibration absorber to the reciprocating inertial mass of the reciprocative rotation mechanism, associated at least one of the interval between two types of the antiresonance occurring in the first dynamic vibration absorber or the interval between two types of the antiresonance occurring in the second dynamic vibration absorber is widened.

6 . The method of claim 4 , wherein
the step of preparing the first and second dynamic vibration absorbers includes a step of changing the spring constant of the spring of at least one of the first dynamic vibration absorber or the second dynamic vibration absorber, thereby allowing at least one of the resonance frequency of the first dynamic vibration absorber or the resonance frequency of the second dynamic vibration absorber to be consistent with associated at least one of the first resonance frequency or the second resonance frequency.

7 . The method of claim 4 , wherein
the step of preparing the first and second dynamic vibration absorbers includes 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.

Assignees

• Mazda Motor

Inventors

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

Classifications

• F16F7/116

  on metal springs · CPC title

• F16F2224/0208

  Alloys · CPC title

• F16J1/16

  with gudgeon-pin; Gudgeon-pins · CPC title

• F16F2226/04

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

• F16C7/023

  for piston engines, pumps or the like · CPC title