Abstract: In a series of reduction gears including a parallel shaft reduction gear and an orthogonal shaft reduction gear, the parallel shaft reduction gear includes a motor, a parallel shaft reducer, and a first joint unit, and the first joint unit includes a first joint casing which is connected to a motor casing and a parallel shaft reducer casing, and a joint shaft which is connected to a motor shaft and the input shaft of the parallel shaft reducer. The orthogonal shaft reduction gear includes the motor and the parallel shaft reducer which are used in common with the parallel shaft reduction gear, a second joint unit in which a portion or all portions are used in common with the first joint unit, and an orthogonal reducer, and the motor, the second joint unit, the orthogonal reducer, and the parallel shaft reducer are connected to one another in this order.

Abstract: Provided is a shovel including a swiveling motor, and a swiveling speed reducer that reduces the rotational speed of an output shaft of the swiveling motor. The swiveling speed reducer includes a first gear mechanism; a first gear case that houses the first gear mechanism; a first oil check pipe that is disposed in the first gear case; a first communication portion that allows an inside of the first gear case and the first oil check pipe to communicate with each other; and a second communication portion that connects a position of the first gear case higher than a position where the first communication portion is connected, and a high position of the first oil check pipe.

Abstract: A shovel includes: a speed reducer configured by stacking a plurality of gear speed reducers each having a sun gear, a planetary gear, an internal gear, and a carrier member supporting the planetary gear provided in a case, in a direction of an axis of rotation of an upper turning body; and a movement restriction section which is provided between the sun gear of one gear speed reducer among the gear speed reducers stacked in a plurality and another gear speed reducer stacked so as to face the sun gear and restricts movement of the sun gear of the one gear speed reducer toward the other gear speed reducer, wherein the movement restriction section is provided at the case.

Abstract: A simple planetary reduction gear includes a sun gear, a planetary gear which revolves around the sun gear and is supported by a carrier, and an internal gear with which the planetary gear internally meshes, and is used in a vertically installed state. The sun gear includes a shaft portion protruding to a load side (lower side) coaxially with a shaft center O1 of the sun gear, and the shaft portion is supported by a ball bearing which is disposed between the outer circumference of the shaft portion and the inner circumference of the carrier. Accordingly, high maintainability is secured and a problem of generation of heat is prevented.

Abstract: In a shaft coupling structure in which a first shaft and a second shaft are coupled with each other by a combination of a key coupling and a clamp coupling, the first shaft has a cylindrical portion into which the second shaft is inserted and slits which are formed in the cylindrical portion by cutting off portions thereof in the axial direction, and a clamping fastener is mounted on portions of the outer circumference of the first shaft in which the slits are formed and the slit can be also used as a keyway of the key, and the plurality of slits are formed in the circumferential direction.

Abstract: In a shaft coupling structure in which a second shaft is inserted into a cylindrical portion provided in a first shaft to be coupled with each other, with a bush being interposed between an inner circumference of the first shaft and an outer circumference of the second shaft, the first shaft and the second shaft are coupled with each other by a combination of a key coupling and a clamp coupling; the first shaft has a keyway with which the key engages and a shaft slit which is formed in the cylindrical portion by cutting off a portion thereof in the axial direction; and a fastener for the clamp coupling is mounted on a portion of an outer circumference of the first shaft in which the shaft slit is formed and the bush has a bush slit which corresponds to the keyway.

Abstract: A shovel includes: a speed reducer configured by stacking a plurality of gear speed reducers each having a sun gear, a planetary gear, an internal gear, and a carrier member supporting the planetary gear provided in a case, in a direction of an axis of rotation of an upper turning body; and a movement restriction section which is provided between the sun gear of one gear speed reducer among the gear speed reducers stacked in a plurality and another gear speed reducer stacked so as to face the sun gear and restricts movement of the sun gear of the one gear speed reducer toward the other gear speed reducer, wherein the movement restriction section is provided at the case.

Abstract: Provided is a shovel including a swiveling motor, and a swiveling speed reducer that reduces the rotational speed of an output shaft of the swiveling motor. The swiveling speed reducer includes a first gear mechanism; a first gear case that houses the first gear mechanism; a first oil check pipe that is disposed in the first gear case; a first communication portion that allows an inside of the first gear case and the first oil check pipe to communicate with each other; and a second communication portion that connects a position of the first gear case higher than a position where the first communication portion is connected, and a high position of the first oil check pipe.

Abstract: A simple planetary reduction gear includes a sun gear, a planetary gear which revolves around the sun gear and is supported by a carrier, and an internal gear with which the planetary gear internally meshes, and is used in a vertically installed state. The sun gear includes a shaft portion protruding to a load side (lower side) coaxially with a shaft center O1 of the sun gear, and the shaft portion is supported by a ball bearing which is disposed between the outer circumference of the shaft portion and the inner circumference of the carrier. Accordingly, high maintainability is secured and a problem of generation of heat is prevented.

Abstract: In a series of reduction gears including a parallel shaft reduction gear and an orthogonal shaft reduction gear, the parallel shaft reduction gear includes a motor, a parallel shaft reducer, and a first joint unit, and the first joint unit includes a first joint casing which is connected to a motor casing and a parallel shaft reducer casing, and a joint shaft which is connected to a motor shaft and the input shaft of the parallel shaft reducer. The orthogonal shaft reduction gear includes the motor and the parallel shaft reducer which are used in common with the parallel shaft reduction gear, a second joint unit in which a portion or all portions are used in common with the first joint unit, and an orthogonal reducer, and the motor, the second joint unit, the orthogonal reducer, and the parallel shaft reducer are connected to one another in this order.

Abstract: In a shaft coupling structure in which a second shaft is inserted into a cylindrical portion provided in a first shaft to be coupled with each other, with a bush being interposed between an inner circumference of the first shaft and an outer circumference of the second shaft, the first shaft and the second shaft are coupled with each other by a combination of a key coupling and a clamp coupling; the first shaft has a keyway with which the key engages and a shaft slit which is formed in the cylindrical portion by cutting off a portion thereof in the axial direction; and a fastener for the clamp coupling is mounted on a portion of an outer circumference of the first shaft in which the shaft slit is formed and the bush has a bush slit which corresponds to the keyway.

Abstract: In a shaft coupling structure in which a first shaft and a second shaft are coupled with each other by a combination of a key coupling and a clamp coupling, the first shaft has a cylindrical portion into which the second shaft is inserted and slits which are formed in the cylindrical portion by cutting off portions thereof in the axial direction, and a clamping fastener is mounted on portions of the outer circumference of the first shaft in which the slits are formed and the slit can be also used as a keyway of the key, and the plurality of slits are formed in the circumferential direction.

Abstract: There is provided a speed reducer incorporating portion structure for a plurality of industrial machines in which an eccentric oscillating type speed reducer having an internal gear and an external gear that rotates in an oscillating manner while internally meshing with the internal gear is incorporated. The speed reducer may be incorporated in the plurality of industrial machines, respectively, so that the position of a meshing portion when the external gear is assembled to the internal gear has a specific phase relationship common to the plurality of industrial machines with respect to a specific part of an industrial machine in which the speed reducer is incorporated.

Abstract: There is provided a speed reducer incorporating portion structure for a plurality of industrial machines in which an eccentric oscillating type speed reducer having an internal gear and an external gear that rotates in an oscillating manner while internally meshing with the internal gear is incorporated. The speed reducer may be incorporated in the plurality of industrial machines, respectively, so that the position of a meshing portion when the external gear is assembled to the internal gear has a specific phase relationship common to the plurality of industrial machines with respect to a specific part of an industrial machine in which the speed reducer is incorporated.

Abstract: The reduction gear includes a plurality of first and second rollers that are disposed so as to directly come into rolling contact with the outer peripheries of first and second eccentric bodies; first and second retainers that maintain gaps between the first and second rollers in the circumferential direction of the first and second eccentric bodies; and first and second guide bodies of which the movement in the axial direction is restricted and which restrict the movement of the first and second rollers in the axial direction by coming into direct contact with ends of the first and second rollers.

Abstract: The reduction gear includes a plurality of first and second rollers that are disposed so as to directly come into rolling contact with the outer peripheries of first and second eccentric bodies; first and second retainers that maintain gaps between the first and second rollers in the circumferential direction of the first and second eccentric bodies; and first and second guide bodies of which the movement in the axial direction is restricted and which restrict the movement of the first and second rollers in the axial direction by coming into direct contact with ends of the first and second rollers.

Abstract: The robot joint drive system includes a motor and a reducer for driving a first member and a second member of a robot relative to each other. Output shaft of the reducer is secured to the first member, while a casing of the reducer is secured to the second member. An input shaft of the reducer includes a cantilevered protruded part projecting from the casing of the reducer in a cantilevered manner, and a rotor of the motor is secured to this cantilevered protruded part.