Torsional vibration damper

Patent metadata

Field	Value
Publication number	US-10968977-B2
Application number	US-202016799893-A
Country	US
Kind code	B2
Filing date	Feb 25, 2020
Priority date	Feb 28, 2019
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A torsional vibration damper whose vibration damping performance will not be reduced in a high speed range. In the torsional vibration damper, a planetary gear is oscillated within a first oscillating range when a torsional torque is smaller than a reference torque, and within a second oscillating range when the torsional torque is greater than the reference torque. Each backlash between the pinion gear and at least one of a sun gear and a ring gear within the second oscillating range is individually wider than each backlash between the pinion gear and the sun gear and each backlash between the pinion gear and the ring gear within the first oscillating range.

First claim

What is claimed is:

1. A torsional vibration damper, comprising:
a planetary gear unit that performs a differential action among
a sun gear,
a ring gear arranged concentrically around the sun gear, and
a carrier supporting a plurality of pinion gears interposed between the sun gear and the ring gear in a rotatable manner,

wherein one of the sun gear, the ring gear, and the carrier serves as an input element to which a torque is delivered from an engine,
another one of the sun gear, the ring gear, and the carrier serves as an output element that outputs the torque,
still another one of the sun gear, the ring gear, and the carrier serves as an inertia element that is rotated relatively to the input element and the output element by an inertia force,
an elastic member is interposed between the input element and the output element to be deformed elastically by a torsional torque causing a relative rotation between the input element and the output element, and
each of the pinion gears is individually moved from an initial position when the relative rotation between the input element and the output element is caused by the torsional torque, and individually oscillated by a pulsation of the torque delivered to the input element from the engine,
each of the pinion gears is individually oscillated within a first oscillating range when the torsional torque is smaller than a reference torque,
each of the pinion gears is individually oscillated within a second oscillating range when the torsional torque is greater than the reference torque, and
each backlash between the pinion gears and at least one of the sun gear and the ring gear within the second oscillating range is individually wider than each backlash between the pinion gears and the sun gear within the first oscillating range, and each backlash between the pinion gears and the ring gear within the first oscillating range.

2. The torsional vibration damper as claimed in claim 1 , wherein the second oscillating range is located ahead of the first oscillating range in a rotational direction of the carrier.

3. The torsional vibration damper as claimed in claim 1 , wherein each of the backlashes between the pinion gears and the sun gear within the second oscillating range is individually wider than each of the backlashes between the pinion gears and the sun gear within the first oscillating range, and each of the backlashes between the pinion gears and the ring gear within the first oscillating range.

4. The torsional vibration damper as claimed in claim 1 , wherein each of the backlashes between the pinion gears and the ring gear within the second oscillating range is individually wider than each of the backlashes between the pinion gears and the sun gear within the first oscillating range, and each of the backlashes between the pinion gears and the ring gear within the first oscillating range.

5. The torsional vibration damper as claimed in claim 1 , wherein each of the backlashes between the pinion gears and the sun gear within the second oscillating range and each of the backlashes between the pinion gears and the ring gear within the second oscillating range are individually wider than each of the backlashes between the pinion gears and the sun gear within the first oscillating range, and each of the backlashes between the pinion gears and the ring gear within the first oscillating range.

6. The torsional vibration damper as claimed in claim 1 ,
wherein the reference torque is greater than a first reference torque at which magnitude of vibrations of a spring torque delivered from the input element to the output element through the elastic member is equalized to magnitude of vibrations of an inertia torque of the inertia element, but
smaller than a second reference torque at which the magnitude of the vibrations of the spring torque is equalized to magnitude of vibrations of the torque of the output element.

7. The torsional vibration damper as claimed in claim 2 ,
wherein the reference torque is greater than a first reference torque at which magnitude of vibrations of a spring torque delivered from the input element to the output element through the elastic member is equalized to magnitude of vibrations of an inertia torque of the inertia element, but
smaller than a second reference torque at which the magnitude of the vibrations of the spring torque is equalized to magnitude of vibrations of the torque of the output element.

8. The torsional vibration damper as claimed in claim 3 ,
wherein the reference torque is greater than a first reference torque at which magnitude of vibrations of a spring torque delivered from the input element to the output element through the elastic member is equalized to magnitude of vibrations of an inertia torque of the inertia element, but
smaller than a second reference torque at which the magnitude of the vibrations of the spring torque is equalized to magnitude of vibrations of the torque of the output element.

9. The torsional vibration damper as claimed in claim 4 ,
wherein the reference torque is greater than a first reference torque at which magnitude of vibrations of a spring torque delivered from the input element to the output element through the elastic member is equalized to magnitude of vibrations of an inertia torque of the inertia element, but
smaller than a second reference torque at which the magnitude of the vibrations of the spring torque is equalized to magnitude of vibrations of the torque of the output element.

10. The torsional vibration damper as claimed in claim 5 ,
wherein the reference torque is greater than a first reference torque at which magnitude of vibrations of a spring torque delivered from the input element to the output element through the elastic member is equalized to magnitude of vibrations of an inertia torque of the inertia element, but
smaller than a second reference torque at which the magnitude of the vibrations of the spring torque is equalized to magnitude of vibrations of the torque of the output element.

Assignees

• Toyota Motor Co Ltd
• Aisin Aw Co
• Aisin Aw Ind Co Ltd

Inventors

• Ishibashi Masayuki
• Nishida Hideyuki
• HACHISUWA Isamu
• Oi Yoichi
• Yoshikawa Takuya
• Otsuka Ryosuke
• Tanaka Katsunori
• Hiramoto Tomoyuki

Classifications

• F16F15/1216

  Torsional springs, e.g. torsion bar or torsionally-loaded coil springs · CPC title

• F16H57/0006

  Vibration-damping or noise reducing means specially adapted for gearings (devices for varying tension of belts, ropes or chains with damping means F16H7/0829; toothed members with construction providing vibration damping F16H55/14; reducing vibrations or noise of the gearbox casing F16H57/028; suppression of vibrations or noise of gear selectors F16H59/0208; control of hydrostatic fluid gearing preventing or reducing vibrations or noise F16H61/4183) · CPC title

• F16H57/082

  Planet carriers · CPC title

• F16H1/32

  in which the central axis of the gearing lies inside the periphery of an orbital gear · CPC title

• F16H2001/327

  with the orbital gear having internal gear teeth · CPC title