Rolling vibration reduction device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-11808320-B2
Application number	US-202217699753-A
Country	US
Kind code	B2
Filing date	Mar 21, 2022
Priority date	Mar 24, 2021
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A rolling vibration reduction device for an internal combustion engine includes: a main inertial system configured to rotate with a crankshaft of the internal combustion engine; a driving force transmission mechanism configured to transmit a rotational driving force of the crankshaft, a direction of the rotational driving force being reversed by the driving force transmission mechanism; and a sub-inertial system configured to rotate by the rotational driving force transmitted from the driving force transmission mechanism and to reduce rolling vibration of the internal combustion engine associated with rotation of the crankshaft by rotating in an opposite direction to the crankshaft. A torsional resonance frequency in the rolling vibration reduction device is set to a value higher than an explosion primary frequency at a maximum engine speed in a preset operating region of the internal combustion engine.

First claim

What is claimed is:

1. A rolling vibration reduction device for an internal combustion engine, the rolling vibration reduction device comprising:
a main inertial system configured to rotate with a crankshaft of the internal combustion engine, the main inertial system including a drive gear coaxially mounted to the crankshaft;
a driving force transmission mechanism configured to transmit a rotational driving force of the crankshaft, a direction of the rotational driving force being reversed by the driving force transmission mechanism; and
a sub-inertial system configured to rotate by the rotational driving force transmitted from the driving force transmission mechanism and to reduce rolling vibration of the internal combustion engine associated with rotation of the crankshaft by rotating in an opposite direction to the crankshaft, the sub-inertial system including a driven gear coaxially mounted on a rotor shaft of a motor generator,
wherein a torsional resonance frequency in the rolling vibration reduction device is set to a value higher than an explosion primary frequency at a maximum engine speed in a preset operating region of the internal combustion engine.

2. The rolling vibration reduction device according to claim 1 , wherein at least one of a moment of inertia of the main inertial system and a moment of inertia of the sub-inertial system is set in such a way that the torsional resonance frequency is set to a value higher than the explosion primary frequency.

3. The rolling vibration reduction device according to claim 1 , wherein torsional rigidity of a torsional rigidity element in the rolling vibration reduction device is set in such a way that the torsional resonance frequency is set to a value higher than the explosion primary frequency.

4. The rolling vibration reduction device according to claim 1 , wherein moments of inertia, a torsional rigidity, and a reduction gear ratio are set so that the explosion primary frequency at the maximum engine speed and the torsional resonance frequency satisfy the relationship given by the expression:

fe
max

=

Ne
max

×
N

60
/
2

[
Hz
]

<
f

=

1

2
⁢
n

⁢

k
J

[
Hz
]

,

wherein fe max represents the explosion primary frequency,
wherein Ne max represents the maximum engine speed,
wherein N represents a number of cylinders,
wherein f represents the torsional resonance frequency,
wherein k represents the torsional rigidity, and
wherein J represents the moments of inertia.

Assignees

• Toyota Motor Co Ltd

Inventors

• Iguma Hiroki
• Tsuda Ryota
• Ono Tomohito
• Tomoda Keiju

Classifications

• F16F15/262 Primary

  Masses attached to pinions, camshafts or driving shafts for auxiliary equipment, e.g. for an oil pump · CPC title

• F16F2230/0011

  Balancing, e.g. counterbalancing to produce static balance · CPC title

• F16F2232/02

  Rotary · CPC title

• F02B75/06 Primary

  Engines with means for equalising torque · CPC title

• F16F15/18 Primary

  using electric, {magnetic or electromagnetic} means ({suppression of vibrations of rotating systems by use of non-rotating magnetic or electromagnetic means F16F15/03;} dynamo-electric devices H02K; {control effected upon generator excitation circuit to reduce harmful effects of overloads or transients H02P9/10}) · CPC title