US 4,232,568 A · Output split-type mechanical and hydraulic transmission

Abstract

An output split-type mechanical and hydraulic transmission includes input, intermediate, and output shafts, differential gear mechanisms for establishing different input-output speed ratios, clutch mechanisms for selectively cooperating with components of the differential gear mechanisms and the input, intermediate, and output shafts to establish different input-output speed ratio ranges, and first and second hydraulic pump motors. The first pump motor has a variable hydraulic capacity and is mechanically and driveably connected to the input shaft for establishing variations in the hydraulic capacity. The second pump motor is mechanically connected to at least one component of the differential gear mechanisms for establishing rotational speeds of the components of the differential gear mechanisms during the different input-output speed ratio ranges in relationship to the variations o the first pump motor's hydraulic capacity. A first differential gear mechanism includes at least four elements, the first element being connected to the input shaft, the second element being connected to the second pump motor, and the third and fourth elements being selectively engageable with the intermediate shaft. A second differential gear mechanism includes at last three elements, the first element being connected to the input shaft, the second element being connected to the intermediate shaft, and the third element being connected to the output shaft.

Claims25

Dependent claims

The output split-type mechanical and hydraulic transmission comprising:

(a) an input shaft;
(b) an output shaft:
(c) an intermediate shaft:
(d) first and second hydraulic pump motors hydraulically connected to each other, and at least said first pump motor having a variable hydraulic capacity and being mechanically connected to said input shaft;
(e) a first differential gear mechanism having first and second planetary gears, each of said planetary gears comprising a sun gear, a ring gear, a pinion meshed with said sun gear and said ring gear thereof, and a carrier rotatably supporting said pinion thereof, and wherein said carrier of said second planetary gear is integrally connected to said input shaft and to said ring gear of said first planetary gear, said sun gears of said first and second planetary gears are integrally connected to each other and mechanically connected to said second hydraulic pump motor, and said carrier of said first planetary gear and said ring gear of said second planetary gear are selectively connected to said intermediate shaft;
(f) a second differential gear mechanism having third planetary gear with a sun gear, a ring gear, a pinion meshed with said ring gear and said sun gear thereof, and a carrier rotatably supporting said pinion thereof, and wherein said carrier of said third planetary gear is mechanically connected to said first hydraulic pump motor, said sun gear of said third planetary gear is integrally connected to said intermediate shaft, and said ring gear is selectively connected to said output shaft;
and
(g) clutch means for selectively connecting and disconnecting said ring gear of said second planetary gear to said intermediate shaft, said carrier of said first planetary gear to said intermediate shaft, said intermediate shaft to said output shaft, and said ring gear of said third planetary gear to said output shaft.

5 more elements

An output split-type mechanical and hydraulic transmission, comprising:

(a) an input shaft;
(b) an output shaft;
(c) an intermediate shaft;
(d) first and second hydraulic pump motors hydraulically connected to each other, and at least said first pump motor having a variable hydraulic capacity and being mechanically connected to said input shaft;
(e) a first epicyclic differential gear mechanism including at least four elements and comprising at least first and second planetary gears, each of said planetary gears having three components,
1. the first element thereof being drivingly connected to said input shaft and comprising one component of the first planetary gear and one component of the second planetary gear;
2. the second element thereof being drivingly connected to said second pump motor and comprising another component of the first planetary gear;
3. the third element being selectively engageable with said intermediate shaft and comprising the remaining component of the first planetary gear;
and
4. the fourth element thereof being selectively engageable with said intermediate shaft and comprising another component of the second planetary gear;
(f) first clutch means for selectively engaging said third and fourth elements of said first differential gear mechanism to said intermediate shaft;
and
(g) a second epicyclic differential gear mechanism including at last three elements and comprising at least a third planetary gear having three components,
1. the first element thereof being drivingly connected to the input shaft and comprising one component of the third planetary gear;
2. the second element thereof being drivingly connected to the intermediate shaft and comprising another component of the third planetary gear;
and
3. the third element thereof being connected to the output shaft and comprising the remaining component of the third planetary gear.

14 more elements

An output split-type mechanical and hydraulic transmission comprising:

(a) an input shaft;
(b) an output shaft;
(c) an intermediate shaft;
(d) first and second hydraulic pump motors hydraulically connected to each other, and at least said first pump motor having a variable hydraulic capacity and being mechanically connected to said input shaft;
(e) a first epicyclic differential gear mechanism including at least four elements, the first element being drivingly connected to said input shaft, the second element being drivingly connected to said second pump motor, and the third and fourth elements being selectively engageable with said intermediate shaft;
(f) first clutch means for selectively engaging said third and fourth elements of said first differential gear mechanism to said intermediate shaft;
and
(g) a second epicyclic differential gear mechanism including at least three elements, the first element being drivingly connected to said input shaft, the second element being drivingly connected to said intermediate shaft, and the third element being connected to said output shaft.

5 more elements

The output split-type mechanical and hydraulic transmission comprising:

(a) an input shaft;
(b) an output shaft:
(c) an intermediate shaft;
(d) first and second hydraulic pump motors hydraulically connected to each other, and at least said first pump motor having a variable hydraulic capacity and being mechanically connected to said input shaft;
(e) a first differential gear mechanism having first and second planetary gears, each of said planetary gears comprising a sun gear, a first pinion meshed with said sun gear, a second pinion meshed with said first pinion, a ring gear meshed with said second pinion, and a carrier rotatably supporting said first and second pinions, and wherein said sun gear of said first planetary gear is mechanically connected to said second hydraulic pump motor, said carrier of said first planetary gear is integrally connected to said input shaft and to said ring gear of said second planetary gear, said carrier of said second planetary gear is integrally connected to said ring gear of said first planetary gear and selectively connected to said intermediate shaft, and said sun gear of said second planetary gear is selectively connected to said intermediate shaft;
(f) a speed-reducing mechanism having a third planetary gear with a sun gear, a ring gear, a pinion meshed with said ring gear and said sun gear thereof, and a carrier rotatably supporting said pinion, and wherein said sun gear of said speed-reducing mechanism is integrally connected to said carrier of said first planetary gear and said ring gear of said second planetary gear, and said ring gear of said speed-reducing mechanism is selectively affixed from rotation;
(g) a second differential gear mechanism having a fourth planetary gear with a sun gear, a ring gear, a pinion meshed with said ring gear and said sun gear thereof, and a carrier rotatably supporting said pinion thereof, and wherein said sun gear of said fourth planetary gear is integrally connected to said intermediate shaft, said carrier of said fourth planetary gear is integrally connected to said carrier of said third planetary gear, and said ring gear of said fourth planetary gear is integrally connected to said output shaft;
(h) clutch means for selectively connecting and disconnecting said carrier of said second planetary gear to said intermediate shaft, said sun gear of said second planetary gear to said intermediate shaft, and said intermediate shaft to said output shaft;
and
(i) brake means selectively engageable with said ring gear of said speed-reducing mechanism for affixing said ring gear thereof from rotation.

7 more elements

Dependencies are inferred from the claim text.

Output split-type mechanical and hydraulic transmission

Life of this patent

Output split-type mechanical and hydraulic transmission

Life of this patent

Abstract

Claims25