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: A reduction gear includes: an orthogonal shaft reduction gear having an orthogonal shaft reduction gear casing; and a parallel shaft reduction gear having a parallel shaft reduction gear casing, which is connected to the orthogonal shaft reduction gear, wherein the orthogonal shaft reduction gear casing and the parallel shaft reduction gear casing are connected through a joint plate, the orthogonal shaft reduction gear casing has a flange portion protruding to the outside of the orthogonal shaft reduction gear casing, and the orthogonal shaft reduction gear casing and the joint plate are connected by a first bolt inserted into the flange portion from the orthogonal shaft reduction gear side, and a second bolt inserted into the joint plate from the parallel shaft reduction gear side.

Abstract: A reduction gear includes: an orthogonal shaft reduction gear having an orthogonal shaft reduction gear casing; and a parallel shaft reduction gear having a parallel shaft reduction gear casing, which is connected to the orthogonal shaft reduction gear, wherein the orthogonal shaft reduction gear casing and the parallel shaft reduction gear casing are connected through a joint plate, the orthogonal shaft reduction gear casing has a flange portion protruding to the outside of the orthogonal shaft reduction gear casing, and the orthogonal shaft reduction gear casing and the joint plate are connected by a first bolt inserted into the flange portion from the orthogonal shaft reduction gear side, and a second bolt inserted into the joint plate from the parallel shaft reduction gear side.

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.