Patent EA-004115-B1 (EA)
Title: Hydroelectric device for a hydrostatic-mechanical power-split transmission
Inventor: OTTEN ULRICH
IPC: F16H47/04
Filed: 2001-09-12
Abstract: 1. A hydrostatic unit for a hydro-mechanical torque division transmission for multi-purpose work vehicle, comprising at least two hydrostatic devices (22, 24) being in the form of a variable-displacement pump (22) and a hydraulic motor (24) and being hydraulically connected in which shafts (18, 20) of at least two hydrostatic devices (22, 24) are arranged parallel to one another, an input shaft (36, 100) is connected to the shaft (18) of the variable-displacement pump (22), and at least two output shafts (44, 50, 56, 64, 110) are arranged parallel to one another, at least one of the output shafts (44, 64) is driven mechanically and at least one of the output shafts (50, 56, 110) is driven hydraulically wherein there provided a mounting frame (10, 12) for arranging the power-split transmission in a transmission housing (72), the rotatable shafts 18, 20) of the hydrostatic devices (22, 24) are supported on the mounting frame (10, 12) by bearing units (14, 16, 42, 48), and on which adjusting devices of the hydrostatic devices (22, 24) are supported, wherein the input shaft (36, 100), and the out shafts (44, 50, 56, 64, 110) of the hydrostatic unit are supported on the mounting frame (10, 12) by at least one bearing unit (38, 102, 104) such that it can rotate and that the mounting frame (10, 12) with the hydrostatic devices (22, 24), the input shaft (36, 100), the output shafts (44, 50, 56, 64, 110) and the bearing units (14, 16, 38, 42, 48, 54, 102, 104, 112) together form a functioning hydrostatic sub-assembly that can be pre-assembled. 2. The hydrostatic unit of claim 1 wherein at least one portion of a transmission input shaft (106) driven by a prime mover extends through the mounting frame (10, 12). 3. The hydrostatic unit of claim 1 or 2 wherein the input shaft (36) of the hydrostatic unit is a transmission input shaft driven by a prime mover or is aligned with the transmission input shaft and connected with it such that they rotate together. 4. The hydrostatic unit of claim 1 or 2 wherein the input shaft (100) of the hydrostatic unit can be connected with an output shaft of a separate epicyclic transmission unit. 5. The hydrostatic unit of any one of claims 1-4 wherein the input shaft of the hydrostatic unit is formed as a hollow shaft (100) and runs concentrically to a transmission input shaft (106) running inside the hollow shaft (100) and driven by a prime mover. 6. The hydrostatic unit of any one of claims 1-5 wherein an input shaft (36, 100) of the hydrostatic unit supported on the mounting frame (10, 12) is connected to the shaft (18) of the variable-displacement pump (22) via a gear-set (66, 46; 108, 46). 7. The hydrostatic unit of any one of claims 1-6 wherein at least one output shaft is formed as a hollow shaft (56, 110). 8. The hydrostatic unit of any one of claims 1-7 wherein the input shaft (36, 100) and the output shafts (44, 50, 56, 64, 110) are arranged parallel to the shafts (18, 20) of the hydrostatic devices (22, 24) and wherein the output shafts (44, 50, 56, 64, 110) emerge at one side of the hydrostatic unit. 9. The hydrostatic unit of any one of claims 1-8 wherein at least one output shaft (64) is disposed coaxially to the input shaft (36) and is connected with it such that they rotate together. 10. The hydrostatic unit of any one of claims 1-9 wherein one output shaft (56, 110) is disposed coaxially to the input shaft (36, 100) and can rotate with respect to it. 11. The hydrostatic unit of any one of claims 1-10 wherein the shaft (18, 20) of the hydrostatic unit (22, 24) is connected with a hydraulic output shaft (56, 110) via a gear-set (52, 58). 12. The hydrostatic unit of any one of claims 1-11 wherein at least one output shaft (44, 50) is disposed coaxially to the shaft (18, 20) of the hydrostatic device (22, 24) and is connected with it such that they rotate together. 13. The hydrostatic unit of any one of claims 1-12 wherein the input shaft (100) and/or the output shafts (44, 50, 56, 64, 110) have toothed mating connections (45, 51, 57, 65, 111) in order to establish connections with adjacent components of the drive train such that they will rotate together. 14. The hydrostatic unit of any one of claims 1-13 wherein the mounting frame has at least one bearing sub-assembly (10) and one bearing housing (12) which can be attached to it and wherein the shafts (18, 20) of the hydrostatic units (22, 24), the input shaft (36, 100) and at least one output shaft (44, 50) are supported both in the bearing sub-assembly (10) and in the bearing housing (12). 15. The hydrostatic unit of claim 14 wherein in a space between the bearing sub-assembly (10) and the bearing housing (12) at least one gear-set (66, 46; 108, 46) is disposed which connects the input shaft (36, 100) with the shaft (18) of a hydrostatic device in the form of a variable-displacement pump (22) and/or transferring torque from one to the other at least one output shaft (56, 110) with the shaft (20) of a hydrostatic device in the form of a hydraulic motor (24) is arranged. 16. The hydrostatic unit of any one of claims 1-15 wherein speed sensors (68, 70) are provided for direct or indirect detection of the speeds of rotation of the input shaft (36, 100) and/or of at least one output shaft (44, 50, 56, 110). 17. The hydrostatic unit of any one of claims 1-16 wherein a transmission housing (72) is provided in which the mounting frame (10, 12) and if needed a bearing unit (84) of the input shaft (36) and/or the bearing unit (84) of the transmission input shaft (106) and/or the bearing unit of at least one output shaft of the hydrostatic device are disposed in such a manner as to absorb vibrations. 18. The hydrostatic unit of any one of claims 1-17 wherein the mounting frame (10, 12) is installed in a transmission housing (72) which is essentially top-hat-shaped and open on one side, the transmission input shaft (36, 106) being supported in the bottom flange (76) of the top-hat-shaped transmission housing (72) and output shafts (44, 50, 56, 64, 110) having free ends (45, 51, 56, 65, 111) at the open side. 19. The hydrostatic unit of any one of claims 17 or 18 wherein the transmission housing (72) is sealed relative to adjacent units and a separate hydraulic contour is provided for the transmission parts arranged in the transmission housing (72). 20. The hydrostatic unit of any one of claims 17-19 wherein a hydraulic supply is provided with pump, fluid filter and cooler adapted for arranging on the mounting frame (10, 12) or on the transmission housing (72) and integrated therein to maintain a fluid circuit in the transmission housing. 21. The hydrostatic unit of any one of claims 1-20 wherein at least one hydraulic hose (26) connecting the hydrostatic devices (22, 24) is supported in a crank-like shape on the mounting frame (10, 12) and contains a rotary pass-through (27).