IP Library › Granted Patent US 12673546
Granted Patent B2
US 12673546 · App. 18/033,744 · Granted Jul 7, 2026

Transmission unit and power system

Inventors: Jirou Arakawa (Yokohama, JP); Koichi Funaki (Osaka, JP)
Assignees: OKAMURA CORPORATION; KUBOTA CORPORATION
B60K6/48B60K6/36B60K6/387B60K6/40B60Y2200/92F16H2057/02034F16H2057/02043
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Quick Facts
Patent No.
US 12673546
App. No.
18/033,744
Granted
Jul 7, 2026
Kind
B2
Abstract

A clutch unit ( 20 ) includes a coupling element ( 23 ) configured to, in a power transmission enabled manner, couple an output shaft ( 13 ) of an engine ( 10 ) and an input shaft ( 16 ) of a hydraulic pump ( 15 ) driven by driving force of the engine ( 10 ), and a motor generator ( 18 ) configured to generate driving force separately from the engine ( 10 ), in which the motor generator ( 18 ) is disposed to avoid the coupling element ( 23 ) as viewed from an axial direction of the output shaft ( 13 ).

Claims (50)

1 . A transmission unit comprising:

a coupling including a clutch configured to, in a power transmission enabled manner, couple an output shaft of a driving source and an input shaft of a driven device driven by driving force of the driving source; and

a second driving source configured to generate driving force separately from the driving source,

wherein the second driving source is disposed to avoid the coupling as viewed from an axial direction of the output shaft,

the second driving source is a motor generator and includes a second output shaft that is offset with respect to the output shaft,

a transmission gear train configured to accelerate driving force of the output shaft and transmit the accelerated driving force to the second output shaft is provided between the output shaft and the second output shaft,

between the output shaft and the second output shaft, the transmission gear train configured to transmit power is provided, and a transmission case configured to accommodate the transmission gear train is also provided,

a rotor housing configured to accommodate a rotor configured to rotate integrally with the output shaft is provided in a portion on a driving source side of the transmission case in the axial direction, and

the second driving source is provided side by side with the rotor housing on a same plane when viewed in the axial direction to avoid the rotor housing at the portion on the driving source side of the transmission case.

2 . The transmission unit according to claim 1 ,

wherein the transmission case includes a cylindrical-shaped case portion that has a cylindrical shape and accommodates the output shaft and the coupling coaxial with the output shaft and a flat-shaped case portion that is formed into a flat shape with a width in the axial direction narrower than each width in a width direction and an up-down direction of the flat-shaped case portion and that is disposed on a driven device side of the cylindrical-shaped case portion.

3 . The transmission unit according to claim 2 ,

wherein the clutch is a hydraulic clutch that connects or disconnects a power transmission between the driving source and the driven device,

an oil supply controller configured to control a supply of a hydraulic oil to the hydraulic clutch is disposed on a driving source side of the flat-shaped case portion.

4 . The transmission unit according to claim 2

wherein

the second driving source is a motor generator and is coupled to the driving source via the clutch in a power transmission enabled manner, and

the second driving source is coupled to the driven device without passing through the clutch in a power transmission enabled manner.

5 . A power system comprising:

the transmission unit according to claim 4 ;

the driving source; and

the driven device.

6 . The transmission unit according to claim 3 ,

wherein

the second driving source is a motor generator and is coupled to the driving source via the hydraulic clutch in a power transmission enabled manner, and

the second driving source is coupled to the driven device without passing through the hydraulic clutch in a power transmission enabled manner.

7 . A power system comprising:

the transmission unit according to claim 6 ;

the driving source; and

the driven device.

8 . A power system comprising:

the transmission unit according to claim 2 ;

the driving source; and

the driven device.

9 . A power system comprising:

the transmission unit according to claim 3 ;

the driving source; and

the driven device.

10 . The transmission unit according to claim 1 ,

wherein

the second driving source is a motor generator and is coupled to the driving source via the clutch in a power transmission enabled manner, and

the second driving source is coupled to the driven device without passing through the clutch in a power transmission enabled manner.

11 . A power system comprising:

the transmission unit according to claim 10 ;

the driving source; and

the driven device.

12 . A power system comprising:

the transmission unit according to claim 1 ;

the driving source; and

the driven device.