Bando Chemical Industries, Inc.

Other

Shinichiro Nishikawa

Hirofumi Miyata

Masashi Yoshimura

Masakazu Domoto

Shuichi Nagaya

Yoshihiro Akahoshi

Masahiko Satoda

A hollow cylindrical pulley bodyis carried rotatably by a hollow cylindrical shaft member. A support rodis inserted in the shaft memberto support the shaft memberfor rocking motion about a pivot axis Corthogonal to the shaft member. The pivot axis Cis inclined backward in the direction of belt travel with respect to the direction of load on the shaft member. With this configuration, when the drive beltdeviates to one side, the pulley bodyis immediately angularly moved so that it is inclined with a level difference with respect to the direction of load on the shaft memberand is positioned obliquely relative to the drive belt, thereby producing a force of returning the drive beltto its normal position.

Drive belt pulley and belt drive system

A hollow cylindrical pulley bodyis carried rotatably by a hollow cylindrical shaft member. A support rodis inserted in the shaft member, and the shaft memberis elastically supported to the support rodthrough an elastic body. The elastic bodyis provided within a quarter of the periphery of the support rodthat is located, when viewed along the axis of the shaft member, forward of the line of action of a radial shaft load on the shaft memberwith respect to the direction of rotation of the pulley body. With this configuration, when the drive beltdeviates to one side, the pulley bodyis immediately angularly moved so that it is inclined with a level difference with respect to the direction of the radial shaft load and is positioned obliquely relative to the drive belt. In this manner, a force of compensating for the deviation of the drive beltis produced to avoid its wobbling.

A pulley bodyis provided at its both sides with power transmission members. When a flat beltbecomes misaligned relative to the center of the pulley bodyand comes into contact with one of the power transmission members, a running force of the flat beltis utilized to displace the pulley bodydiagonally relative to the flat belt, thus producing a force for returning the flat beltto its original state.

Pulley for power transmission belt and belt power transmission device

A belt-type one-way clutch is arranged so that a case is assembled with a flat pulley so as to rotate around the central axis of the flat pulley, and that a flat belt is looped between a working surface of a rocking member supported for rocking motion by a shaft member held at both ends in shaft bores of the case and a working surface of the flat pulley, and that the rocking plate biased from a leaf spring presses one span of the flat belt to place an initial tension on the flat belt. Both the ends of the shaft member are held in the shaft bores of the case via respective bushes to suppress stress. Accordingly, larger torque can be transmitted despite use of aluminum alloy as material of the case.

One-way clutch

A pulley with a built-in one-way clutch, the type of which has sprags tilting in a direction to wedge between inner and outer rings while being guided on respective riding lands of a cage by pressing of respective leaf springs, is mounted on an alternator shaft of an alternator to which torque of a crank shaft of a vehicle engine rotating together with slight variations in angular velocity is transmitted through a power transmission belt. In the mounting, a tilting force acting on a contact point at which each sprag contacts the corresponding riding land to tilt the sprag in the wedging direction is set larger than a frictional force between the sprag and the riding land acting on the contact point. According to this setting, the sprag can be tilted in the wedging direction regardless of the frictional force between the sprag and the riding land, thereby eliminating a locking failure within the high engine speed range.

In an infinitely variable speed transmission T of this invention, a belt variable speed mechanism 4 is arranged between a first rotatable shaft 1 and a second rotatable shaft 2. A planetary gear mechanism 81 is provided which comprises a first, a second, and a third element. The first element is drivingly coupled to the second rotatable shaft 2. The second and third elements are drivingly coupled by way of different power transmission lines to the first rotatable shaft 1. An enclosed gear housing space 78 is defined at the back of a fixed sheave 14 of a second variable speed pulley 13 of the belt variable speed mechanism 4, to house therein the planetary gear mechanism 81. A belt transmission mechanism 55 is arranged between the first and second rotatable shafts 1 and 2. Supported on a flange 82 integral with the second rotatable shaft 2 is a planetary gear 84 having a first gear part 85 that engages with a first sun gear 88 and a second gear part 86 that engages with a second sun gear 90. The first sun gear 88 is drivingly coupled to a second transmission pulley 57 of the mechanism 55. The second sun gear 90 is drivingly coupled to the second variable speed pulley 13 of the mechanism 4. The distance between the shafts 1 and 2 can be changed easily, and the size of casing for gear engagement area covering can be made as small as possible.

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Hyogo, Japan

Shinichiro Nishikawa