Multi-range coaxial hydromechanical transmission

Claim 2

A hydromechanical transmission comprising in combination; an input shaft; an output shaft; fluid pump means coaxially drivingly connected with said input shaft; fluid motor means in fluid communication with said fluid pump means and having an output member concentric to said input shaft; planetary gearing means coaxial with said input shaft including first and second sun gears, first and second ring gears, first and second planet carriers, a plurality of pinion gears rotatably mounted in the first carrier and being in mesh with the first sun gear and first ring gear, and a plurality of pinions rotatably mounted in the second carrier and being in mesh with said second sun gear and said second ring gear said sun gears being drive connected with said output member, said first planet carrier and said second ring gear being drive connected with said output shaft; first and second clutch means coaxial with and operatively connected to said input shaft and being selectively engageable for providing a drive connection to said first ring gear and said second planet carrier respectively; and brake means coaxial with and operatively connected to said second planet carrier and being selectively operable for preventing rotation thereof.

Claim 3

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a hydraulic pump device, a hydraulic motor device in fluid communication with said hydraulic pump device; and displacement control means for controlling the displacement of one of said hydraulic devices for varying the torque ratio; an input shaft drivingly connected with said hydraulic pump device and extending coaxially with said hydraulic pump device and said hydraulic motor device; an output shaft axially aligned with said input shaft; planetary gearing means coaxial with said input shaft including six members with the first and second members drivingly connected with said hydrAulic motor device, and third and fourth members drivingly connected with said output shaft; first clutch means coaxial with said input shaft and selectively operable to connect the fifth member of said gearing means with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the sixth member with said input shaft; and brake means selectively operable to connect the sixth member to a non-rotating portion of said transmission.

Claim 4

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a hydraulic pump device, a hydraulic motor device in fluid communication with said hydraulic pump device; and displacement control means for controlling the displacement of one of said hydraulic devices for varying the torque ratio; an input shaft drivingly connected with said hydraulic pump device and extending coaxially with said hydraulic pump device and said hydraulic motor device; an output shaft axially aligned with said input shaft; planetary gearing means coaxial with said input shaft including six members with the first and second members drivingly connected with said hydrAulic motor device, and third and fourth members drivingly connected with said output shaft; first clutch means coaxial with said input shaft and selectively operable to connect the fifth member of said gearing means with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the sixth member with said input shaft; and brake means selectively operable to connect the sixth member to a non-rotating portion of said transmission.

Claim 5

A hydromechanical transmission comprising in combination; variable displacement hydraulic pump means; pump displacement control means for controlling the pump; variable displacement hydraulic motor means in fluid communication with said variable displacement hydraulic pump means and having an output member; motor displacement control means for controlling the motor displacement; an input shaft drivingly connected with said variable displacement hydraulic pump and extending coaxially with said variable displacement hydraulic pump means and said variable displacement hydraulic motor means; an output shaft axially aligned with said input shaft; planetary gearing means coaxial with said input shaft including two sun gear members drivingly connected with said output member of said variable displacement hydraulic motor means, a first carrier member and a first ring gear member drivingly connected with said output shaft a second arrier member, a second ring gear member, first pinion gear means rotatably mounted in said first carrier and meshing with one sun gear member and said first ring gear member, and second pinion gear means rotatably mounted in said second carrier member and meshing with the other sun gear member and said second ring gear member; first clutch means coaxial with said input shaft and selectively operable to connect the second ring gear of said gearing means with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the second carrier member with said input shaft; and brake means selectively operable to connect the second carrier member to a non-rotating portion of said transmission.

Claim 6

A hydromechanical transmission comprising in combination; variable displacement hydraulic pump means; pump displacement control means for controlling the pump; variable displacement hydraulic motor means in fluid communication with said variable displacement hydraulic pump means and having an output member; motor displacement control means for controlling the motor displacement; an input shaft drivingly connected with said variable displacement hydraulic pump and extending coaxially with said variable displacement hydraulic pump means and said variable displacement hydraulic motor means; an output shaft axially aligned with said input shaft; planetary gearing means coaxial with said input shaft including two sun gear members drivingly connected with said output member of said variable displacement hydraulic motor means, a first carrier member and a first ring gear member drivingly connected with said output shaft a second arrier member, a second ring gear member, first pinion gear means rotatably mounted in said first carrier and meshing with one sun gear member and said first ring gear member, and second pinion gear means rotatably mounted in said second carrier member and meshing with the other sun gear member and said second ring gear member; first clutch means coaxial with said input shaft and selectively operable to connect the second ring gear of said gearing means with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the second carrier member with said input shaft; and brake means selectively operable to connect the second carrier member to a non-rotating portion of said transmission.

Claim 7

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including variable hydraulic pump means, hydraulic motor means in fluid communication with said hydraulic pump means, and displacement control means for controlling the speed and torque ratio of the transmission; an input shaft drivingly connected with said hydraulic pump means and extending coaxially with said variable displacement hydraulic pump means; said hydraulic motor means having an output member; an output shaft axially aligned with said input shaft; planetary gearing means coaxial with said input shaft including two sun gear members drivingly connected with said output member of said hydraulic motor means, a first carrier member and a first ring gear member drivingly connected with said output shaft, a second carrier member, ring gear member, first pinion gear means rotatably mounted in said first carrier and meshing with one sun gear member and said first ring gear member, and second pinion gear means rotatably mounted in said second carrier member and meshing with the other sun gear member and said second ring gear member; first clutch means coaxial with said input shaft and selectively operable to connect the second ring gear of said gearing means with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the second carrier member with said input shaft; and brake means selectively operable to connect the second carrier member to a non-rotating portion of said transmission.

Claim 8

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including variable hydraulic pump means, hydraulic motor means in fluid communication with said hydraulic pump means, and displacement control means for controlling the speed and torque ratio of the transmission; an input shaft drivingly connected with said hydraulic pump means and extending coaxially with said variable displacement hydraulic pump means; said hydraulic motor means having an output member; an output shaft axially aligned with said input shaft; planetary gearing means coaxial with said input shaft including two sun gear members drivingly connected with said output member of said hydraulic motor means, a first carrier member and a first ring gear member drivingly connected with said output shaft, a second carrier member, ring gear member, first pinion gear means rotatably mounted in said first carrier and meshing with one sun gear member and said first ring gear member, and second pinion gear means rotatably mounted in said second carrier member and meshing with the other sun gear member and said second ring gear member; first clutch means coaxial with said input shaft and selectively operable to connect the second ring gear of said gearing means with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the second carrier member with said input shaft; and brake means selectively operable to connect the second carrier member to a non-rotating portion of said transmission.

Claim 9

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a housing having a support portion with a central bore; a pump device rotatably mounted on one side of said support portion and having a central bore, a hydraulic motor device rotatably mounted on tHe other side of said support portion in fluid communication with said hydraulic pump device through said support portion and having a central bore, and displacement control means for controlling the displacement of one of said hydraulic devices for varying the torque ratio; an input shaft drivingly connected with said hydraulic pump device and extending coaxially through said central bores of said hydraulic pump device, and said support portion and said hydraulic motor device; an output shaft axially aligned with said input shaft; planetary gearing means coaxial with said input shaft and on said other side of said support portion including six members with the first and second members drivingly connected by a first sleeve shaft with said hydraulic motor device, and third and foruth members drivingly connected with said output shaft; first clutch means coaxial with said input shaft and selectively operable to connect the fifth member of said gearing means with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the sixth member with said input shaft; and brake means selectively operable to connect the sixth member to said support portion including a second sleeve shaft extending between said input shaft and said first sleeve shaft.

Claim 10

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a housing having a support portion with a central bore; a pump device rotatably mounted on one side of said support portion and having a central bore, a hydraulic motor device rotatably mounted on tHe other side of said support portion in fluid communication with said hydraulic pump device through said support portion and having a central bore, and displacement control means for controlling the displacement of one of said hydraulic devices for varying the torque ratio; an input shaft drivingly connected with said hydraulic pump device and extending coaxially through said central bores of said hydraulic pump device, and said support portion and said hydraulic motor device; an output shaft axially aligned with said input shaft; planetary gearing means coaxial with said input shaft and on said other side of said support portion including six members with the first and second members drivingly connected by a first sleeve shaft with said hydraulic motor device, and third and foruth members drivingly connected with said output shaft; first clutch means coaxial with said input shaft and selectively operable to connect the fifth member of said gearing means with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the sixth member with said input shaft; and brake means selectively operable to connect the sixth member to said support portion including a second sleeve shaft extending between said input shaft and said first sleeve shaft.

Claim 11

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a housing having a support portion with a central bore; a pump device rotatably mounted on one side of said support portion and having a central bore, a hydraulic motor device rotatably mounted on the other side of said support portion in fluid communication with said hydraulic pump device through said support portion and having a central bore, and displacement control means for controlling the displacement of one of said hydraulic devices for varying the torque ratio; an input shaft drivingly connected to and coaxially aligned with said hydraulic pump device; intermediate shaft means extending coaxially through said central bores of said hydraulic pump device, and said support portion and said hydraulic motor device; an output shaft coaxially aligned with said input shaft and said intermediate shaft means; planetary gearing means coaxial with said input shaft and on said other side of said support portion including six members with the first and second members drivingly connected with said hydraulic motor device, and third and fourth members drivingly connected with said output shaft; means for connecting said input shaft to said gearing means including said intermediate shaft means, first clutch means coaxial with said input shaft and selectively operable to connect the fifth member of said gearing means with said input shaft, and second clutch means coaxial with said input shaft and selectively operable to connect the sixth member with said input shaft; and brake menas selectively operable to connect the sixth member to said support portion.

Claim 12

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a housing having a support portion with a central bore; a pump device rotatably mounted on one side of said support portion and having a central bore, a hydraulic motor device rotatably mounted on the other side of said support portion in fluid communication with said hydraulic pump device through said support portion and having a central bore, and displacement control means for controlling the displacement of one of said hydraulic devices for varying the torque ratio; an input shaft drivingly connected to and coaxially aligned with said hydraulic pump device; intermediate shaft means extending coaxially through said central bores of said hydraulic pump device, and said support portion and said hydraulic motor device; an output shaft coaxially aligned with said input shaft and said intermediate shaft means; planetary gearing means coaxial with said input shaft and on said other side of said support portion including six members with the first and second members drivingly connected with said hydraulic motor device, and third and fourth members drivingly connected with said output shaft; means for connecting said input shaft to said gearing means including said intermediate shaft means, first clutch means coaxial with said input shaft and selectively operable to connect the fifth member of said gearing means with said input shaft, and second clutch means coaxial with said input shaft and selectively operable to connect the sixth member with said input shaft; and brake menas selectively operable to connect the sixth member to said support portion.

Claim 13

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a housing having a support portion with a central bore; a pump device rotatably mounted on one side of said support portion and having a central bore, a hydraulic motor device rotatably mounted on the other side of said support portion in fluid communication with said hydraulic pump device through said support portion and having a central bore, and displacement control means for controlling the displacement of one of said hydraulic devices for varying the torque ratio; an input shaft drivingly connected with said hydraulic pump device; a sleeve shaft and an intermediate shaft extending coaxially through said central bores of said hydraulic pump device, said support portion and said hydraulic motor device and being coaxially aligned with said input shaft; an output shaft coaxially aligned with said input shaft; planetary gearing means coaxial with said input shaft and on said other side of said support portion includinG six members with the first and second members drivingly connected with said hydraulic motor device, third and fourth members drivingly connected with said output shaft, the fifth member drivingly connected with said sleeve shaft, and the sixth member drivingly connected with said intermediate shaft; first clutch means coaxial with said input shaft and selectively operable to connect the sleeve shaft with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the intermediate shaft with said input shaft; and brake means selectively operable to connect the second sleeve shaft to said support portion.

Claim 14

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a housing having a support portion with a central bore; a pump device rotatably mounted on one side of said support portion and having a central bore, a hydraulic motor device rotatably mounted on the other side of said support portion in fluid communication with said hydraulic pump device through said support portion and having a central bore, and displacement control means for controlling the displacement of one of said hydraulic devices for varying the torque ratio; an input shaft drivingly connected with said hydraulic pump device; a sleeve shaft and an intermediate shaft extending coaxially through said central bores of said hydraulic pump device, said support portion and said hydraulic motor device and being coaxially aligned with said input shaft; an output shaft coaxially aligned with said input shaft; planetary gearing means coaxial with said input shaft and on said other side of said support portion includinG six members with the first and second members drivingly connected with said hydraulic motor device, third and fourth members drivingly connected with said output shaft, the fifth member drivingly connected with said sleeve shaft, and the sixth member drivingly connected with said intermediate shaft; first clutch means coaxial with said input shaft and selectively operable to connect the sleeve shaft with said input shaft; second clutch means coaxial with said input shaft and selectively operable to connect the intermediate shaft with said input shaft; and brake means selectively operable to connect the second sleeve shaft to said support portion.