Nabtesco Corporation

Kyodo Yushi Co., Ltd.

Hongyou Wang

Ko Tanimura

Ryosuke Saito

Ryosuke Ichimura

Takahide Kumagai

Hiroyuki Miyoshi

Junichi Imai

Yasuyuki Hattori

Shigeki Asano

The invention provides a lubricant composition for an eccentric oscillating planetary gear type speed reducer comprising the following components (a) to (d): (a) a base oil containing a synthetic oil; (b) at least one calcium salt selected from the group consisting of calcium salts of petroleum sulfonic acids, calcium salts of alkyl aromatic sulfonic acids, calcium salts of salicylates, calcium salts of phenates, calcium salts of oxidized waxes, overbased calcium salts of petroleum sulfonic acids, overbased calcium salts of alkyl aromatic sulfonic acids, overbased calcium salts of salicylates, overbased calcium salts of phenates, and overbased calcium salts of oxidized waxes; (c) an antioxidant; and (d) a glycerin fatty acid ester.

Lubricant composition for a speed reducer, and speed reducer

The invention provides a lubricant composition for an eccentrically oscillating speed reducer of planetary gear type, which is capable of extending the life of the speed reducer under high temperatures and keeping low input torque at low temperatures, and includes (a) a base oil containing a synthetic oil, (b) a hydrocarbon wax, and (c) at least one calcium salt selected from the group consisting of a calcium salt of petroleum sulfonic acid, a calcium salt of alkyl aromatic sulfonic acid, a calcium salt of oxidized wax, an overbasic calcium salt of petroleum sulfonic acid, an overbasic calcium salt of alkyl aromatic sulfonic acid, and an overbasic calcium salt of oxidized wax.

Lubricant composition for speed reducer and speed reducer

A gear transmission comprises an external gear and an internal gear that rotates eccentrically relative to the external gear while meshing with the external gear. At least one first recess is formed on an outer peripheral side of the internal gear so that at least a portion of a motor is disposed within the first recess, thereby shortening the length and width of the device that includes the motor and the gear transmission in the axial and radial direction, respectively.

Gear transmission

A first reduction gear unit has a first input shaft that rotates in accordance with the rotation of an output shaft of a motor, a first external gear that revolves orbitally around an axis line of the first input shaft, and a first internal gear that has a number of teeth differing from the number of teeth of the first external gear. A second reduction gear unit comprises a crankshaft that rotates in accordance with the rotation of a first output shaft, a second external gear having a through hole formed at a center itself, a cylindrical member passing through the through hole of the second external gear, a second internal gear that has a number of teeth differing from the number of teeth of the second external gear, and a second output shaft that rotates around an axis line of the second internal gear. The first reduction gear unit is disposed between an outer circumferential surface of the second reduction gear unit and an inner surface of the cylindrical member.

Growing community of inventors

Tsu, Japan

Hongyou Wang