Motor vehicles – Power – Including traction motor of kind driven by noncompressible...
Patent
1996-07-24
1998-12-15
Hurley, Kevin
Motor vehicles
Power
Including traction motor of kind driven by noncompressible...
180248, 180197, B60K 17356
Patent
active
058486640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for hydrostatically driving a vehicle comprising at least two ideal axles which have each at least one drivable wheel, each drivable wheel being driven by at least one hydraulic motor connected to at least one hydraulic source, and the driving power of each hydraulic motor being transmitted via a transmission system to the respective wheel.
2. The Related Art
In a process of this type as is known from FR-A-14 33 626, each wheel can be shifted between three drive gears over a two-step wheel hub gearing. To satisfy different speed and torque demands, this drive is limited to the magnitude of the ratios and the adjustment range of the associated hydraulic motor. In practice it has been found that the driving range covered thereby is not sufficient. With a drive designed for high torques it is normally only possible to implement small driving speeds; a drive for high vehicle speed has most of the time inadequate torque grades.
The same problem is found in a hydrostatically driven wheel hub drive which is known from ER-A-13 60 296, and, in which, in addition to two different planet steps, the drive requirements are defined by the power range of the driving hydraulic motor.
In a process which is known from WO 91/01899, the drivable wheels of different axles are driven by transmission systems having different ratios. With a decreasing demand on load, the drive of the axles with the greatest ratio is decoupled and, when the load demand further decreases, the same is done analogously with the remaining driving axles until in an extreme case the whole drive power is transmitted from the axle with the smallest ratio. A plurality of axles are disadvantageously required for a fine adjustment of the power to be transmitted to the ground, To achieve high torques and great driving speeds, as many axles as are possible have to be used in the vehicle with transmission systems that are as finely adjusted as possible with respect to one another. This makes the drive more complex and expensive, and the vehicle cannot be used in some fields of application because of a great number of axles.
SUMMARY OF THE INVENTION
The invention is based on the technical problem to provide a process for hydrostatically driving a vehicle of the above-mentioned type, wherein the vehicle can be used under different performance requirements and can be produced and operated in a simple and inexpensive manner.
This technical problem is solved according to the invention in that the drivable wheels are driven with a first identical ratio of the transmission system before a first load limit is reached, the effective drive power of the wheels of at least one ideal axle is reduced when a first load limit is reached and the ratio of the transmission system is changed when a second load limit is reached, and the wheels driven before the first load limit are driven with the same ratio.
At the beginning, all wheels transmit the same power portion to the ground due to the initial driving of the wheels with a first identical ratio. As a result, a maximum drive power can evenly be transmitted to the ground under maximum load requirements, e.g., during start, so that the vehicle can be accelerated without any slip. If a desired speed has, e.g., been reached at this first ratio, an increased speed can be achieved by reducing the effective drive of at least one ideal axle, a high torque being still transmittable at the first ratio to the ground via the uninterruptedly driven wheels. As a result, the vehicle is also driven in this state with a great propulsive power. For example, if a second speed has been reached, the speed can further be increased by changing the ratio of the transmission system and by driving all drivable wheels, the vehicle being again driven by more axles than before the time at which the second load limit was reached. As a result, a lot of power can again be transmitted to the ground without slip via a plurality of axles. When the second load l
REFERENCES:
patent: 3053043 (1962-09-01), Knowler
patent: 3302741 (1967-02-01), Brazuk
patent: 3344879 (1967-10-01), Glomb et al.
patent: 3552516 (1971-01-01), Beard
patent: 3865207 (1975-02-01), Schwab et al.
patent: 3894606 (1975-07-01), Hunck et al.
patent: 5201570 (1993-04-01), Heren et al.
EC Engineering & Consulting Spezial-maschinen GmbH
Hurley Kevin
LandOfFree
Method and apparatus for hydrostatically driving a vehicle with does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for hydrostatically driving a vehicle with , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for hydrostatically driving a vehicle with will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1451107