Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid pump and motor in one of plural paths to or from...
Patent
1996-03-18
1998-01-20
Ta, Khoi Q.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid pump and motor in one of plural paths to or from...
475 79, 475 83, F16H 4702
Patent
active
057096287
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the US national phase of PCT application PCT/EP95/00470 filed 9 Feb. 1995 with a claim to the priority of German application P 44 04 829.7 filed 16 Feb. 1994.
FIELD OF THE INVENTION
The present invention relates to a transmission for mobile construction machine.
BACKGROUND OF THE INVENTION
German 3,907,633 describes a steplessly variable hydrostatic propulsion drive with at least one constant-displacement motor connected via gearing of a predetermined transmission ratio permanently with a common output as well as at least one variable-displacement motor swingable back into a null position, a clutch being provided between the variable motor and the output. The variable motor has a larger transmission ratio of its gearing to the output than the constant motor permanently connected with the output. Alternatively thereto a first motor swingable back into a null position is connected hydraulically in parallel to a second variable motor.
When the variable motor reaches its end position it is immediately shifted to an adjustment angle alpha=0 or to a self-blocking condition and while doing this it is separated by a clutch from the output while simultaneously the deflection angle of the propulsion-drive pump is set back to the extent necessary to correspond to the final stroke volume of the variable motor. The deflection angle of the propulsion-drive pump is now either increasingly moved to the full deflection angle so that the final speed is achieved with the still connected constant-displacement motor. On a decrease in speed the described steps are carried out in reverse so that below a predetermined traction need in a lower speed range the clutch is again closed and while this is happening the variable motor is again brought into action. The disadvantage of this state of the art is generally that with two drives one of them is decoupled fully in the drive phase and as a result cannot be used any more for an increase in capacity.
European 0,137,406 describes an apparatus for the variable propulsion of large masses, in particular for driving the wheels of large-load vehicles, for driving construction machines, conveyors, or the like. The apparatus has a mainly one-stage planetary or gear transmission connected to a prime mover and at least two motor shafts which are each connected to a hydrostatic drive motor as well as a device for the preferably stepless adjustment of the rotation of at least one of the hydrostatic drive motors, at least one of the two motor shafts being connected directly with the sun gear of the planetary or gear transmission and the other of the motor shafts being connected with the rotatably mounted ring gear of the planetary or gear transmission and the planet carrier of the planetary or gear transmission being connected with one of the motor shafts for rotation thereby. One of the motor shafts or a part drivingly coupled to it, in particular the ring gear of the planetary drive can be arrested by a disk brake. The pumps are preferably variable over their full swing angle and as a result the motors powered by these pumps can be driven in both directions and even stopped and arrested by the disk brake at a zero-angle setting.
European 0,137,406 does allow high output speeds to be achieved because the principle of additive drives allows the input speeds of two hydromotors to be mechanically added to each other. The torque capacity of the drive is however at most as high as the smaller torque capacity of the two drive units taking into account the mechanical translation between the motor shafts. This is due to the fact that the two motors are braced against each other and the corresponding torque is transmitted to the output shaft which to take into account the mechanical translation must be smaller than the torque capacities of the two motors. If the torque of the output shaft, taking into account the mechanical translation with which the two motors are applied to the output shaft, exceeds the torque capacity of one of the tw
REFERENCES:
patent: 3596535 (1971-08-01), Polak
patent: 3748924 (1973-07-01), Cross
patent: 4291592 (1981-09-01), Meyerle et al.
patent: 4976664 (1990-12-01), Hagin et al.
patent: 4983149 (1991-01-01), Kita
patent: 5139465 (1992-08-01), Sato
patent: 5193416 (1993-03-01), Kanayama
patent: 5248283 (1993-09-01), Eckhardt et al.
patent: 5277670 (1994-01-01), Tenberge
patent: 5337629 (1994-08-01), Kita
patent: 5518461 (1996-05-01), Pfordt
patent: 5584772 (1996-12-01), Hayd
Pidde Gerd
Tolksdorf Detlef
Dubno Herbert
Kwon Peter T.
Ta Khoi Q.
Wilford Andrew
LandOfFree
Hydrostatic transmission for construction machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydrostatic transmission for construction machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrostatic transmission for construction machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-721926