US 12,276,083 B2
Speed reducer and construction machine
Takuya Shinozaki, Tokyo (JP); and Etsuro Komori, Tokyo (JP)
Assigned to Nabtesco Corporation, Tokyo (JP)
Filed by Nabtesco Corporation, Tokyo (JP)
Filed on Feb. 16, 2022, as Appl. No. 17/673,528.
Claims priority of application No. 2021-060386 (JP), filed on Mar. 31, 2021; and application No. 2021-187257 (JP), filed on Nov. 17, 2021.
Prior Publication US 2022/0316178 A1, Oct. 6, 2022
Int. Cl. E02F 9/20 (2006.01); E02F 9/02 (2006.01); F16H 1/28 (2006.01); F16H 57/04 (2010.01)
CPC E02F 9/202 (2013.01) [E02F 9/02 (2013.01); F16H 1/28 (2013.01); F16H 57/0412 (2013.01); F16H 57/0424 (2013.01); F16H 57/0476 (2013.01); F16H 57/0486 (2013.01); B60Y 2200/412 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A speed reducer comprising:
at least one speed reducing unit for decelerating a rotational driving force of an electric motor and transmitting the decelerated rotational driving force to a rotational driving unit; and
a channel provided in a gear of the at least one speed reducing unit and configured to communicate a fluid,
wherein the channel has a C-shape as the gear provided with the channel is viewed from a direction of a rotational axis of the electric motor,
wherein the gear provided with the channel is provided with a flange,
wherein the flange is provided with an inlet port and an outlet port connected to the channel,
wherein the channel extending in a circumferential direction,
wherein an inlet positioned at one end of the channel in an extension direction thereof is connected with the inlet port,
wherein an outlet positioned at the other end of the channel in the extension direction thereof is connected with the outlet port,
wherein the fluid received through the inlet and the inlet port flows through the channel in a first direction along the extension direction from the inlet toward the outlet, and is discharged through the outlet and the outlet port, and
wherein the fluid does not flow through the channel in a second direction along the extension direction, the second direction being opposite to the first direction.