Coaxial hydromechanical transmission

Claim 2

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a housing having a support portion with a central bore; a variable displacement hydraulic 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; an input shaft drivingly connected with said hydraulic pump device, an intermediate shaft extending coaxially through said central bores of said hydraulic pump device, said support portion and said hydraulic motor device; an output shaft axially aligned with said input shaft and said intermediate shaft; planetary gearing means coaxial with said intermediate shaft and on said other side of said support portion including six members with a sleeve shaft consisting of 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 intermediate shaft and selectively operable to connect the fifth member of said gearing means with said input shaft through said intermediate shaft; and brake means selectively operable to connect the sixth member to said housing.

Claim 3

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a housing having a support portion with a central bore; a variable displacement hydraulic 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; an input shaft drivingly connected with said hydraulic pump device, an intermediate shaft extending coaxially through said central bores of said hydraulic pump device, said support portion and said hydraulic motor device; an output shaft axially aligned with said input shaft and said intermediate shaft; planetary gearing means coaxial with said intermediate shaft and on said other side of said support portion including a sleeve shaft consisting of first and second sun gears, first and second ring gears and first and second planet carrier means with said first and second sun gears drivingly connected by said sleeve shaft with said hydraulic motor device, and said first planet carrier means and said second ring gear drivingly connected with said output shaft; first clutch means coaxial with said intermediate shaft and selectively operable to connect the second planet carrier means with said input shaft through said intermediate shaft; and brake means selectively operable to connect the first ring gear to said housing.

Claim 4

A hydromechanical transmission comprising in combination; variable displacement hydraulic transmission means including a housing having a support portion with a central bore; a variable displacement hydraulic 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; an input shaft drivingly connected with said hydraulic pump device, an intermediate shaft extending coaxially through said central bores of said hydraulic pump device, said support portion and said hydraulic motor device; an output shaft axially aligned with said input shaft and said intermediate shaft; planetary gearing means coaxial with said intermediate shaft and on said other side of said support portion including a sleeve shaft consisting of first and second sun gears, first and second ring gears and first and second planet carrier means with said first and second sun gears drivingly connected by said sleeve shaft with said hydraulic motor device, and said first planet carrier means and said second ring gear drivingly connected with said output shaft; first clutch means coaxial with said intermediate shaft and selectively operable to connect the second planet carrier means with said input shaft through said intermediate shaft; and brake means selectively operable to connect the first ring gear to said housing.

Claim 5

A hydromechanical transmission comprising in combination; a housing; a support member secured in said housing and having a central bore; a variable ratio hydraulic transmission including a variable displacement hydraulic pump and a hydraulic motor coaxially rotatably mounted on opposite sides of said support member; an input shaft rotatably mounted in said housing coaxial with and drivingly connected with said variable displacement hydraulic pump; an output shaft aligned with said input shaft; planetary gearing means having a sleeve shaft consisting of a pair of sun gears driVingly connected with said hydraulic motor, a first carrier and first ring gear drivingly connected with said output shaft, a second carrier and a second ring gear; selectively operable brake means operatively connected between said housing and said second ring gear to establish a gear drive in series with said hydraulic transmission between said input and output shafts; an intermediate shaft coaxially aligned with said input shaft; and extending through said central bore of said support member; and selectively operable clutch means for providing a drive connection including said intermediate shaft between said input shaft and said second carrier to establish a mechanical drive to said planetary gearing in parallel with said hydraulic transmission; said hydraulic transmission and said planetary gearing cooperating to provide synchronous interchange of said brake means and said clutch means.

Claim 6

A hydromechanical transmission comprising in combination; a housing; a support member secured in said housing and having a central bore; a variable ratio hydraulic transmission including a variable displacement hydraulic pump and a hydraulic motor coaxially rotatably mounted on opposite sides of said support member; an input shaft rotatably mounted in said housing coaxial with and drivingly connected with said variable displacement hydraulic pump; an output shaft aligned with said input shaft; planetary gearing means having a sleeve shaft consisting of a pair of sun gears driVingly connected with said hydraulic motor, a first carrier and first ring gear drivingly connected with said output shaft, a second carrier and a second ring gear; selectively operable brake means operatively connected between said housing and said second ring gear to establish a gear drive in series with said hydraulic transmission between said input and output shafts; an intermediate shaft coaxially aligned with said input shaft; and extending through said central bore of said support member; and selectively operable clutch means for providing a drive connection including said intermediate shaft between said input shaft and said second carrier to establish a mechanical drive to said planetary gearing in parallel with said hydraulic transmission; said hydraulic transmission and said planetary gearing cooperating to provide synchronous interchange of said brake means and said clutch means.

Claim 7

A hydromechanical transmission comprising in combination; a housing; a variable ratio hydraulic transmission including a support member secured in said housing and having an annular wall centrally connected to a pintle member extending forwardly to provide a pump pintle portion and rearwardly to provide a motor pintle portion and having a plurality of axial passages connecting said pump and motor pintle portions and a central axial bore within said passages, a variable displacement radial hydraulic pump and a hydraulic motor coaxially rotatably mounted on opposite sides of said support member each having a rotor having a cylindrical portion in bearing engagement respectively with said pump and motor pintle portions; an input shaft rotatably mounted in said housing coaxial with and drivingly connected with said cylindrical portion of said pump; an output shaft aligned with said input shaft; an intermediate shaft coaxially aligned with and rotatably supported on said input and output shafts extending through said central bore of said pintle member and having a drive connection at the forward end to said input shaft; planetary gearing means having a first gear set adjacent said motor and a second gear set adjacent said output shaft and each having a sun gear, a ring gear and a carrier rotatably supporting pinions meshing with said sun and ring gears, said sun gears being a single sleeve member rotatably supported on said intermediate shaft and drivingly connected with said cylindrical portion of said hydraulic motor, said first gear set carrier and second gear set ring gear being drivingly connected with said output shaft, and said second gear set carrier having a drive connection with said intermediate shaft; selectively operable brake means operatively connected and located between said housing and said first gear set ring gear to establish a gear drive in series with said hydraulic transmission between said input and output shafts having a back-up and support member rotatably supporting said front gear set carrier; and one of said intermediate shaft drive connections being selectively operable clutch means for selectively providing a drive connection including said intermediate shaft between said input shaft and said second gear set carrier to establish a mechanical drive to said planetary gearing in parallel with said hydraulic transmission; said hydraulic transmission and said planetary gearing cooperating to provide synchronous interchange of said brake means and said clutch means.

Claim 8

A hydromechanical transmission comprising in combination; a housing; a variable ratio hydraulic transmission including a support member secured in said housing and having an annular wall centrally connected to a pintle member extending forwardly to provide a pump pintle portion and rearwardly to provide a motor pintle portion and having a plurality of axial passages connecting said pump and motor pintle portions and a central axial bore within said passages, a variable displacement radial hydraulic pump and a hydraulic motor coaxially rotatably mounted on opposite sides of said support member each having a rotor having a cylindrical portion in bearing engagement respectively with said pump and motor pintle portions; an input shaft rotatably mounted in said housing coaxial with and drivingly connected with said cylindrical portion of said pump; an output shaft aligned with said input shaft; an intermediate shaft coaxially aligned with and rotatably supported on said input and output shafts extending through said central bore of said pintle member and having a drive connection at the forward end to said input shaft; planetary gearing means having a first gear set adjacent said motor and a second gear set adjacent said output shaft and each having a sun gear, a ring gear and a carrier rotatably supporting pinions meshing with said sun and ring gears, said sun gears being a single sleeve member rotatably supported on said intermediate shaft and drivingly connected with said cylindrical portion of said hydraulic motor, said first gear set carrier and second gear set ring gear being drivingly connected with said output shaft, and said second gear set carrier having a drive connection with said intermediate shaft; selectively operable brake means operatively connected and located between said housing and said first gear set ring gear to establish a gear drive in series with said hydraulic transmission between said input and output shafts having a back-up and support member rotatably supporting said front gear set carrier; and one of said intermediate shaft drive connections being selectively operable clutch means for selectively providing a drive connection including said intermediate shaft between said input shaft and said second gear set carrier to establish a mechanical drive to said planetary gearing in parallel with said hydraulic transmission; said hydraulic transmission and said planetary gearing cooperating to provide synchronous interchange of said brake means and said clutch means.