Torsional vibration damper

Patent metadata

Field	Value
Publication number	US-2018306271-A1
Application number	US-201815959440-A
Country	US
Kind code	A1
Filing date	Apr 23, 2018
Priority date	Apr 24, 2017
Publication date	Oct 25, 2018
Grant date	—

Abstract

A torsional vibration damper in which vibration damping performance is ensured by preventing a contact between a rolling mass and a rotary member. A rolling mass includes a trunk penetrating through a bore. A first corner formed in an axial end of the trunk is rounded. A rotary member includes a second corner formed in the bore. an axial length of the first corner of the rolling mass is longer than an axial length of the second corner of the rotary member.

First claim

What is claimed is:

1 . A torsional vibration damper comprising:
a rotary member that is rotated by a torque; a bore that is formed on the rotary member; and a rolling mass that is oscillated along a raceway surface of the bore by a rotation of the rotary member; wherein the rolling mass includes a trunk penetrating through the bore, a first corner formed in any one of an axial end of the trunk in which an outer diameter of the trunk increases gradually toward an axial end, and a flange portion formed on axially outer side of the first corner whose outer diameter is larger than an opening width of the bore, the rotary member includes a second corner formed in the bore in which an opening width of the bore increases gradually toward a radially outer side, the second corner includes a radially outer corner at which a thickness of the rotary member is maximum thickness, the first corner includes an opposing point that is to be opposed to the radially outer corner of the rotary member in an axial direction when the rolling mass is oscillated along a raceway surface of the bore, and an axial length between a starting point of the first corner and the opposing point in the rolling mass is longer than an axial length of the second corner in the rotary member.

2 . The torsional vibration damper as claimed in claim 1 ,
wherein the first corner includes a first curved surface, and the second corner includes a chamfered portion and a second curved surface.

3 . The torsional vibration damper as claimed in claim 1 ,
wherein the first corner includes an inclined corner surface that is inclined at a predetermined angle with respect to a rotational center axis of the rotary member, and the second corner includes a chamfered portion and a second curved surface.

4 . The torsional vibration damper as claimed in claim 2 ,
wherein the flange portion includes an inner surface connected to the first corner, and the inner surface includes an inclined surface that is inclined at a predetermined angle with respect to the rotational center axis of the rotary member.

5 . The torsional vibration damper as claimed in claim 2 , wherein a curvature radius of the first curved surface falls within a range from 0.2 mm to 2.0 mm.

6 . The torsional vibration damper as claimed in claim 3 , wherein an inclination angle of the inclined corner surface with respect to the rotational center axis of the rotary member and an inclination angle of the inclined surface with respect to the rotational center axis of the rotary member are different from each other.

7 . The torsional vibration damper as claimed in claim 6 , wherein the inclination angle of the inclined corner surface is smaller than the inclination angle of the inclined surface.

8 . The torsional vibration damper as claimed in claim 7 , wherein the inclination angle of the inclined surface falls within a range from 45 degrees to 85 degrees.

9 . The torsional vibration damper as claimed in claim 8 , wherein the inclination angle of the inclined corner surface falls within a range from 1 degree to 84 degrees.

10 . The torsional vibration damper as claimed in claim 8 , wherein the inclination angle of the inclined corner surface falls within a range from 10 degrees to 50 degrees.

11 . The torsional vibration damper as claimed in claim 8 , wherein the inclination angle of the inclined corner surface is set to 45 degrees.

12 . The torsional vibration damper as claimed in claim 1 , wherein the flange portion and the first corner are formed on both axial sides of the trunk, and
wherein the rolling mass comprises: a first piece having a cylindrical shaft portion serves as the trunk, an insertion hole formed in the cylindrical shaft portion, and the flange portion formed integrally with the cylindrical shaft portion; and a second piece having the flange portion, and a shaft portion protruding from the flange portion to be inserted into the insertion hole of the first piece.

13 . The torsional vibration damper as claimed in claim 12 , wherein a configuration of the first corner of one of axial ends of the trunk and a configuration of the first corner of the other one of axial ends of the trunk are different from each other.

Assignees

• Toyota Motor Co Ltd

Inventors

• Horita Shuhei
• Amano Hiroyuki
• Suzuki Yuji
• Miyahara Yu

Classifications

• F16F15/145 Primary

  Masses mounted with play with respect to driving means thus enabling free movement over a limited range · CPC title

• F16D3/12

  specially adapted for accumulation of energy to absorb shocks or vibration (by making use of fluid elements F16D3/80) · CPC title

• F16F15/3153

  Securing inertia members to the shafts · CPC title

• F16F15/14

  using masses freely rotating with the system, {i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers (compensation of inertia forces F16F15/22; weights for balancing rotating bodies F16F15/32)} · CPC title

• F16F15/12 Primary

  using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon ({F16F15/14} , F16F15/16 take precedence) · CPC title