Hydraulically controlled planetary gear

Claim 2

An automatic hydraulically controlled planetary gear transmission comprising a case, an input shaft and an output shaft coaxial with the input shaft, a planetary gear mechanism comprising two sun gears, planet gears carried by a planet gear carrier and a ring gear connected to the output shaft, a first brake means between paid planet gear carrier and the case and actuating means therefor, a first drum member connected to said input shaft, a first hub member integral with or fixed to an intermediate shaft coaxial with said input and output shafts and carrying one of said sun gears, a first clutch device between said first drum member and said first hub member, fluid operated piston and cylinder means for actuating said first clutch device, a second drum member integral with or fixed to a hollow shaft member coaxial with and rotatably mounted on said intermediate shaft and carrying a second of said sun gears, said second drum member extending at least partly around said first drum member, a second clutch device between said first and second drum members, fluid operated piston and cylinder means for actuating said second clutch means, second brake means between said second drum member and said case and a fluid operated piston and cylinder unit for actuating said second brake means, the two drum members, the two clutch devices and said second brake means being disposed concentrically at a first end of the transmission and the planetary gear mechanism and the first brake means being located concentrically at a second end of the transmission, the transmission having a middle part comprising radially from the interior toward the exterior of the transmission : said intermediate shaft, said hollow shaft rotatably mounted on the intermediate shaft, a free wheel device having a freewheel hub rotatably mounted on the hollow shaft and connected to rotate with the planet gear carrier, locking members, and a freewheel outer ring, and an annular member integral with or fixed to the transmission case and to said outer ring and at least partly defining the cylinder of the piston and cylinder unit for actuating said second brake device.

Claim 3

A transmission as claimed in claim 1, comprising radial passages formed respectively in the intermediate shaft and in the hollow shaft, for supplying fluid to at least one of said piston and cylinder means for actuating the associated clutch devices from the centre shaft, a collar mounted on the hollow shaft and acting as a bearing face for the piston actuating said one clutch device, the collar having a hollow portion in a part of the collar adjacent the end of the drum of said one clutch device, the hollow portion defining with the hollow shaft a passage for said fluid.

Claim 4

A transmission as claimed in claim 1, wherein at least one drum member has a substantially cylindrical portion and a splined portion of larger diameter than the cylindrical portion and slidably receiving elements of a clutch device, a sleeve being mounted in the cylindrical portion and acting as a bearing face for the piston for actuating the corresponding clutch device.

Claim 5

A transmission as claimed in claim 1, comprising, in interposed relation between the hollow shaft and the hub of the freewheel, an intermediate annular member and an extension of the second drum member and which extension is fixed to said second sun gear.

Claim 6

A transmission as claimed in claim 1, comprising a conduit in the centre shaft, radial passages in the centre shaft and in the hollow layshaft and radial passages in the hub of the freewheel, said conduit communicating with said passages for supplying lubricating fluid to the transmission.

Claim 7

A transmission as claimed in claim 5, comprising a washer connected to an assemblY consisting of the freewheel hub and planetary gear carrier, said washer having an inner face defining a chamber with adjacent portions of the free-wheel hub and of the planet gear carrier, a supply passage in the freewheel hub and lubricating conduits in shafts carrying the planet gears communicating with said chamber.

Claim 8

A transmission as claimed in claim 1, wherein the freewheel hub and the planet gear carrier have complementary teeth, the teeth of the planet gear carrier being adapted and arranged to allow the assembly of the adjacent sun gear.

Claim 9

An automatic hydraulically controlled planetary gear transmission comprising a case, an input shaft and an output shaft coaxial with the input shaft, a planetary gear mechanism comprising two sun gears, planet gears carried by a planet gear carrier and a ring gear connected to the output shaft, a first brake means between said planet gear carrier and the case and actuating means therefor, a first drum member connected to said input shaft, a first hub member integral with or fixed to an intermediate shaft coaxial with said input and output shafts and carrying one of said sun gears, a first clutch device between said first drum member and said first hub member, fluid operated piston and cylinder means for actuating said first clutch device, a second drum member integral with or fixed to a hollow shaft member coaxial with and rotatably mounted on said intermediate shaft and carrying a second of said sun gears, said second drum member extending at least partly around said first drum member, a second clutch device between said first and second drum members, fluid operated piston and cylinder means for actuating said second clutch means, second brake means between said second drum member and said case and a fluid operated piston and cylinder unit for actuating said second brake means, the two drum members, the two clutch devices and said second brake means being disposed concentrically at a first end of the transmission and the planetary gear mechanism and the first brake means being located concentrically at a second end of the transmission, the transmission having a middle part comprising radially from the interior toward the exterior of the transmission : said intermediate shaft, said hollow shaft rotatably mounted on the intermediate shaft, a free wheel device having a freewheel hub rotatably mounted on the hollow shaft and connected to rotate with the planet gear carrier, locking members and a freewheel outer ring, and an annular member integral with or fixed to the transmission case and to said outer ring and at least partly defining the cylinder of the piston and cylinder unit for actuating the said second brake device, said annular member having an U-shaped section defining an inner branch which is integral with the outer ring of the freewheel and an outer branch fixed to the transmission case, said annular member defining two bearing faces for said piston actuating the second brake means.

Claim 10

An automatic hydraulically controlled planetary gear transmission comprising a case, an input shaft and an output shaft coaxial with the input shaft, a planetary gear mechanism comprising two sun gears, planet gears carried by a planet gear carrier and a ring gear connected to the output shaft, a first brake means between said planet gear carrier and the case and actuating means therefor, a first drum member connected to said input shaft, a first hub member integral with or fixed to an intermediate shaft coaxial with said input and output shafts and carrying one of said sun gears, a first clutch device between said first drum member and said first hub member, fluid operated piston and cylinder means for actuating said first clutch device, a second drum member integral with or fixed to a hollow shaft member coaxial with and rotatably mounted on said intermediate shaft and carrying a second of said sun gears, said second drum member extending at least partly around said first drum member, a second clutch device between said first and second drum members, fluid operated piston and cylinder means for actuating said second clutch means, second brake means between said second drum member and said case and a fluid operated piston and cylinder unit for actuating said second brake means, the two drum members, the two clutch devices and said second brake means being disposed concentrically at a first end of the transmission and the planetary gear mechanism and the first brake means being located concentrically at a second end of the transmission, the transmission having a middle part comprising radially from the interior toward the exterior of the transmission : said intermediate shaft, said hollow shaft rotatably mounted on the intermediate shaft, a free wheel device having a freewheel hub rotatably mounted on the hollow shaft and connected to rotate with the planet gear carrier, locking members and a freewheel outer ring, and an annular member integral with or fixed to the transmission case and to said outer ring and at least partly defining the cylinder of the piston and cylinder unit for actuating the said second brake device, said annular member having an U-shaped section defining an inner branch which is integral with the outer ring of the freewheel and an outer branch fixed to the transmission case, said annular member defining two bearing faces for said piston actuating the second brake means.

Claim 11

An automatic hydraulically controlled planetary gear transmission comprising a case, an input shaft and an output shaft coaxial with the input shaft, a planetary gear mechanism comprising two sun gears, planet gears carried by a planet gear carrier and a ring gear connected to the output shaft, a first brake means between paid planet gear carrier and the case and actuating means therefor, a first drum member connected to said input shaft, a first hub member integral with or fixed to an intermediate shaft coaxial with said input and output shafts and carrying one of said sun gears, a first clutch device between said first drum member and said first hub member, fluid operated piston and cylinder means for actuating said first clutch device, a second drum member integral with or fixed to a hollow shaft member coaxial with and rotatably mounted on said intermediate shaft and carrying a second of said sun gears, said second drum member extending at least partly around said first drum member, a second clutch device between said first and Second drum members, fluid operated piston and cylinder means for actuating said second clutch means, second brake means between said second drum member and said case and a fluid operated piston and cylinder unit for actuating said second brake means, the two drum members, the two clutch devices and said second brake means being disposed concentrically at a first end of the transmission and the planetary gear mechanism and the first brake means being located concentrically at a second end of the transmission, the transmission having a middle part comprising radially from the interior toward the exterior of the transmission : said intermediate shaft, said hollow shaft rotatably mounted on the intermediate shaft, a free wheel device having a freewheel hub rotatably mounted on the hollow shaft and connected to rotate with the planet gear carrier, locking members and a freewheel outer ring, and an annular member integral with or fixed to the transmission case and to said outer ring and at least partly defining the cylinder of the piston and cylinder unit for actuating said second brake device, said annular member having an L-shaped section defining a first bearing face for the associated piston, a second bearing face for the associated piston being defined by an outer face of the outer ring of the freewheel.

Claim 12

An automatic hydraulically controlled planetary gear transmission comprising a case, an input shaft and an output shaft coaxial with the input shaft, a planetary gear mechanism comprising two sun gears, planet gears carried by a planet gear carrier and a ring gear connected to the output shaft, a first brake means between paid planet gear carrier and the case and actuating means therefor, a first drum member connected to said input shaft, a first hub member integral with or fixed to an intermediate shaft coaxial with said input and output shafts and carrying one of said sun gears, a first clutch device between said first drum member and said first hub member, fluid operated piston and cylinder means for actuating said first clutch device, a second drum member integral with or fixed to a hollow shaft member coaxial with and rotatably mounted on said intermediate shaft and carrying a second of said sun gears, said second drum member extending at least partly around said first drum member, a second clutch device between said first and Second drum members, fluid operated piston and cylinder means for actuating said second clutch means, second brake means between said second drum member and said case and a fluid operated piston and cylinder unit for actuating said second brake means, the two drum members, the two clutch devices and said second brake means being disposed concentrically at a first end of the transmission and the planetary gear mechanism and the first brake means being located concentrically at a second end of the transmission, the transmission having a middle part comprising radially from the interior toward the exterior of the transmission : said intermediate shaft, said hollow shaft rotatably mounted on the intermediate shaft, a free wheel device having a freewheel hub rotatably mounted on the hollow shaft and connected to rotate with the planet gear carrier, locking members and a freewheel outer ring, and an annular member integral with or fixed to the transmission case and to said outer ring and at least partly defining the cylinder of the piston and cylinder unit for actuating said second brake device, said annular member having an L-shaped section defining a first bearing face for the associated piston, a second bearing face for the associated piston being defined by an outer face of the outer ring of the freewheel.

Claim 13

A transmission as claimed in claim 8, comprising a toothed flange on said annular member, splines in the transmission case engaging said toothed flange, and a shoulder in the transmission case engaging said toothed flange so as to prevent said annular member from rotating and provide an axial abutment for said annular member.

Claim 14

A transmission as claimed in claim 9, comprising a toothed flange on said annular member, splines in the transmission case engaging said toothed flange, and a shoulder in the transmission case engaging said toothed flange so as to prevent said annular member from rotating and provide an axial abutment for said annular member.