Torsional vibration damper and manufacturing method thereof
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMasayuki ISHIBASHI, Yu SHIRAISHI, Hiroyuki AMANO
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Abstract
A torsional vibration damper having improved abrasion resistance at a portion of a rotary member to which a rolling mass is contacted, and a manufacturing method thereof. The torsional vibration damper comprises: a rotary member; an inertia body oscillating around the rotary member; and a retainer formed on the rotary member to hold a rolling mass between a pair of stoppers. A hardness of an inner surface of at least one of the stoppers is increased higher in a radially outer portion than in a radially inner portion, within a reciprocating range of the rolling mass.
Claims11
A torsional vibration damper comprising:
- a rotary member that is rotated by torque transmitted thereto;
- an inertia body that is arranged coaxially with the rotary member while being allowed to oscillate relatively to the rotary member;
- a retainer having a pair of stoppers protruding radially outwardly from an outer circumference of the rotary member;
- and
- a rolling mass that is held in the retainer to connect the rotary member to the inertia body while being allowed to reciprocate in a radial direction,
- wherein torque of the rotary member is transmitted to the inertia body through the rolling mass to damp torsional vibrations of the rotary member,
- the pair of stoppers are opposed to each other in a circumferential direction of the rotary member so that the rolling mass is held between the stoppers, and
- a hardness of an inner surface of at least one of the stoppers is increased higher in a radially outer portion than in a radially inner portion, within a reciprocating range of the rolling mass.
A manufacturing method of a torsional vibration damper, comprising:
- a rotary member that is rotated by torque transmitted thereto;
- an inertia body that is arranged coaxially with the rotary member while being allowed to oscillate relatively to the rotary member;
- a retainer that protrudes radially outwardly from an outer circumference of the rotary member;
- and
- a rolling mass that is held in the retainer to connect the rotary member to the inertia body while being allowed to reciprocate in a radial direction,
- wherein torque of the rotary member is transmitted to the inertia body through the rolling mass to damp torsional vibrations of the rotary member, and
- the retainer includes a pair of stoppers being opposed to each other in a circumferential direction of the rotary member so that the rolling mass is held between the stoppers,
- the manufacturing method comprising:
- applying a surface treatment to an inner surface of at least one of the stoppers within a reciprocating range of the rolling mass, thereby increasing a hardness of a radially outer portion of the inner surface higher than a hardness of a radially inner portion thereof.
Dependencies are inferred from the claim text.