Teijin Seiki Co., Ltd.

Teijin Seiko Co., Ltd.

Hong You Wang

Jun Hirose

Masataka Hashimoto

Toshio Yoshikawa

Shinji Juman

Koji Kawashima

A polishing device having a table connected to a traction drive type reduction gear. The reduction gear includes an externally contacting shaft formed in a ring-shaped hollow cylinder and arranged at the center; a plurality of intermediate shafts which are equidistantly disposed at the circumference of the externally contacting shaft, at least one of which is an input shaft; and an internally contacting cylinder with which the intermediate shafts internally contact, and under free conditions, the externally contacting shaft formed in a hollow cylinder has a diameter which is a little bit larger than a diameter of an imaginary circle which externally contacts with a plurality of intermediate shafts whereby pressing load is created by means of deformation of the hollow cylinder.

Rotary drive device of a polishing device

A traction drive type driving apparatus is provided, by which any particular pressing mechanism is unnecessary, by which a big deformation can be obtained easily, in which decreasing degree of the pressing load is extremely small against small amount of abrasion, in which the test for confirming the pressing load at a desired amount can be done easily, and which has a readily constructible hollow structure. The traction drive type driving apparatus comprises an externally contacting shaft (,) located at the center, a plurality of intermediate shafts (,) equidistantly disposed around and externally contacting with the externally contacting shaft (,), and an internally contacting cylinder (,) internally contacting with the intermediate shafts (,), at least one of the intermediate shafts offset from the center is an input shaft, and the externally contacting shaft (,) is a ring-like hollow cylinder and is held by the intermediate shafts (,) to form a floating ring without disposing any particular bearing.

Traction drive type driving apparatus

An internally meshing planetary gear device which comprises an internal gear having a circular arc tooth form and an outer gear of a planetary gear having an epitrochoid tooth form, the internal gear comprises pins, both ends of which are supported, and rolling bearings inserted onto the pins, and the rolling bearings have outer races meshing with the outer gear.

Internally meshing planetary gear device

A traction drive type driving apparatus is provided, by which any particular pressing mechanism is unnecessary, by which a big deformation can be obtained easily, in which decreasing degree of the pressing load is extremely small against small amount of abrasion, in which the test for confirming the pressing load at a desired amount can be done easily, and which has a readily constructible hollow structure. The traction drive type driving apparatus comprises an externally contacting shaft (2) located at the center, a plurality of intermediate shafts (1) equidistantly disposed around and externally contacting with the externally contacting shaft (2), and an internally contacting cylinder (3) internally contacting with the intermediate shafts (1), at least one of the intermediate shafts offset from the center is an input shaft, and the externally contacting shaft (2) is a ring-like hollow cylinder and is held by the intermediate shafts (1) to form a floating ring without disposing any particular bearing.

A planetary gear apparatus comprising an inner tooth gear having an inner peripheral portion formed with a plurality of inner teeth each in the form of a semi-circular cross-section shape and an outer tooth gear positioned within the inner tooth gear and having an outer peripheral portion formed with a plurality of outer teeth each in the form of a wave shape. The outer tooth gear has a center axis offset at an offset amount from the center axis of the inner tooth gear, and revolvable while being held in sliding and meshing contact with the inner tooth gear with the center axis of the outer tooth gear moving on a revolution orbit encircling and spaced from the center axis of the inner tooth gear at a distance equal to the offset amount. The outer teeth of the outer tooth gear have their respective tooth profiles each including deddendum and addendum portions, and a pair of tooth engaging portions each connected at its deddendum side end with the deddendum portion and at its addendum side end with the addendum portion. In the planetary gear apparatus, each of the tooth engaging portions of the tooth profiles has an epitrochoidal tooth surface extending on a theoretical epitrochoid curve having a central point coincident wit the center axis of the outer tooth gear, and the epitrochoidal tooth surfaces of the outer teeth are partly continually held in pressing contact with the inner teeth of the inner tooth gear even under the state that no load torque is applied to the outer tooth gear. The deddendum and addendum portions of the tooth profile of the outer tooth are closer to the center axis of the outer tooth gear than the theoretical epitrochoid cure, thereby making it possible to have the deddendum and addendum portions held out of contact with the inner teeth of the inner tooth gear even under the state that a certain load torque is exerted on the outer tooth gear.

Growing community of inventors

Mie-ken, Japan

Hong You Wang