A speed reducer according to the present invention includes: at least one gear member for changing a speed of rotations input from a rotary device and outputting the rotations; a case housing the gear member; and a heating unit provided on the case and configured to heat the case or an inside of the case.

Disclosed in the present invention is a transmission mechanism, comprising an outer wheel, an inner wheel, an eccentric shaft, a first flange body, a rotating shaft and a planetary gear device. The inner wheel is provided in the outer wheel and is engaged with the outer wheel. The eccentric shaft can rotate around a central axis; an eccentric portion, eccentric shaft outer teeth and a first support portion are provided on the periphery of the eccentric shaft; and the inner wheel is provided around the eccentric portion. The first flange body and the inner wheel are provided side by side, and the first flange body is provided around the first support portion. The rotating shaft has rotating shaft external teeth. The planetary gear device is supported by the first flange body, and a first row of planetary teeth engaged with the rotating shaft outer teeth and a second row of planetary teeth engaged with the eccentric shaft outer teeth are provided at the periphery of the planetary gear device. The transmission mechanism can provide a wide range of speed ratios and reduce production costs.

There is provided a technique capable of increasing support rigidity of a bearing when a support member expands due to moisture absorption. A power transmission device includes: a rotary shaft; a support member disposed outside the rotary shaft in a radial direction; a bearing disposed between the rotary shaft and the support member; and a fitting member fitted to an outer peripheral portion of the support member. The fitting member is made of a material having lower hygroscopicity than hygroscopicity of a material of the support member.

A speed reducer according to one aspect of the present disclosure includes: an input gear; a plurality of spur gears configured to rotate in mesh with the input gear; one or more eccentric cams formed on each of a plurality of shafts, each of the plurality of shafts being coupled to corresponding one of the plurality of spur gears; and one or more eccentric gears each having a plurality of first through-holes and a plurality of second through-holes, each of the plurality of first through-holes rotatably supporting corresponding one of the one or more eccentric cams, the second through-holes being disposed adjacent to the first through-holes and formed asymmetrically as viewed from a direction of a central axis, and the one or more eccentric gear are configured to rotate eccentrically relative to a rotational axis of the input gear in conjunction with rotation of the one or more eccentric cams.

A drive transmission device according to one embodiment of the disclosure includes: an arm having a motor that generates a rotational force; a speed reducer that is provided in the arm and has a carrier for decelerating rotation of the motor and outputting the decelerated rotation; a bucket fixed to the carrier by a reamer bolt, the reamer bolt being inserted in a bracket through hole formed in the bucket; and a resin bush provided between an internal surface of the bracket through hole and an external lateral surface of the reamer bolt. The mechanical strength of the resin bush is lower than the mechanical strength of the bucket and the mechanical strength of the reamer bolt.

A drive transmission device according to one embodiment of the disclosure includes a single differential unit to which rotation of a motor is transmitted and two speed reducers each having an operation output shaft that is coupled to the differential unit and a carrier that changes a speed of the rotation of the operation output shaft and outputs the rotation. The two speed reducers are arranged such that they are opposed to each other along a second rotation axis, and the operation output shaft and the carrier in each speed reducer are aligned in the second rotation axis direction.

A drive transmission device includes a first member and a second member rotatably coupled about a rotation axis; a drive source generating a rotational force that drives the first member and the second member; speed reducers transmitting the rotational force from the drive source to the second member; at least two bracket portions arranged in the rotation axis direction in the second member; and a flange portion extending in a direction intersecting the rotation axis, having an overlapping region where the flange portion overlaps the bracket portion viewed from a direction along the rotation axis direction, and connecting the speed reducer and the bracket portion. A restricting member that extends in the rotation axis direction and restricts the relative rotational movement between the bracket portion and the flange portion, and a receiving portion that receives the restricting member are provided in the overlapping region.

A reducer for high precision control includes a pin gear housing and two-stage reduction components disposed therein: a first-stage reduction component including an input shaft, a sun gear and a planet gear; and a second-stage reduction component including 2-3 eccentric shafts distributed uniformly, cycloidal gears, a pin, a left rigid disk and a right rigid disk, and bearings, wherein the cycloidal gears are supported by bearings on two eccentric sections of the eccentric shaft, shaft extensions on two sides of the eccentric section of the eccentric shaft are supported by bearings on the left rigid disk and the right rigid disk, and the left rigid disk and the right rigid disk are supported by bearings in inner holes of two sides of the pin gear housing.

A seal member includes a seal base portion that has a retaining portion provided at a position corresponding to a recess formed in an end surface of a gear device. The seal base portion contacts the end surface of the gear device to seal a housing space in the gear device. The seal member further includes a fixing member that fixes the retaining portion to the device in the recess.

A washing machine driving mechanism includes a shaftless rotator (23) for generating rotational energy; a gear reduction mechanism (200) mounted on the rotator (23) and configured to obtain rotational energy from an eccentric position of the rotator (23) and output the energy with or without speed reduction; and a first driving part (11) connected with the gear reduction mechanism (200) and configured to supply the rotational energy with or without the speed reduction to respective execution parts of the washing machine. The rotator is a rotor of a motor, and an output rotating shaft on the rotor is canceled. The washing machine driving mechanism has a technical effect of being compact in structure and small in space occupancy.