Accessory drive belt transmission system for automobile and v-ribbed belt used for the same
AssigneesToyota Jidosha Kabushiki Kaisha, Bando Chemical Industries, Ltd.
InventorsHideaki Kawahara, Takeshi Nishigaki, Hideyuki Kato, Kosuke Sogawa, Kazunori Ueno, Kenji Yamanari, Shin Satsumabayashi
Life of this patent
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Abstract
When the rotational speed of an engine 11 is equal to or higher than 4000 rpm, the rotational fluctuation ratio of a crank shaft pulley 13 at an outer circumferential surface thereof is sometimes equal to or greater than 6%. Moreover, in the layout in which a V-ribbed belt 20 is wound on a plurality of pulleys 14, 15, at least one of span lengths is equal to or longer than 220 mm. The V-ribbed belt 20 includes a back reinforcement fabric.
Claims10
An accessory drive belt transmission system for an automobile, comprising:
- an engine;
- a crank shaft pulley which is a ribbed pulley provided on a crank shaft of the engine;
- an accessory drive pulley which is a ribbed pulley;
- and
- a V-ribbed belt wound on a plurality of pulleys including the crank shaft pulley and the accessory drive pulley and having three or four V-shaped ribs,
- wherein a rotational fluctuation ratio of the crank shaft pulley at an outer circumferential surface thereof is sometimes equal to or greater than 6% at an engine rotational speed of equal to or higher than 4000 rpm, and at least one of span lengths is equal to or longer than 220 mm in a layout in which the V-ribbed belt is wound on the plurality of pulleys, and
- the V-ribbed belt includes
- a V-ribbed belt body made of rubber and formed with the V-shaped ribs on an inner circumferential side thereof,
- a core wire embedded in the V-ribbed belt body and formed of aliphatic polyamide fibers, and
- a back reinforcement fabric bonded to an outer circumferential part of the V-ribbed belt body.
A V-ribbed belt used for an accessory drive belt transmission system for an automobile including
- an engine,
- a crank shaft pulley which is a ribbed pulley provided on a crank shaft of the engine,
- an accessory drive pulley which is a ribbed pulley, and
- the V-ribbed belt wound on a plurality of pulleys including the crank shaft pulley and the accessory drive pulley and having three or four V-shaped ribs,
- in which a rotational fluctuation ratio of the crank shaft pulley at an outer circumferential surface thereof is sometimes equal to or greater than 6% at an engine rotational speed of equal to or higher than 4000 rpm, and at least one of span lengths is equal to or longer than 220 mm in a layout in which the V-ribbed belt is wound on the plurality of pulleys, the V-ribbed belt comprising:
- a V-ribbed belt body made of rubber and formed with the V-shaped ribs on an inner circumferential side thereof;
- a core wire embedded in the V-ribbed belt body and formed of aliphatic polyamide fibers;
- and
- a back reinforcement fabric bonded to an outer circumferential part of the V-ribbed belt body.
Dependencies are inferred from the claim text.