Measuring and testing – Simulating operating condition – Marine
Patent
1988-09-29
1990-02-06
Myracle, Jerry W.
Measuring and testing
Simulating operating condition
Marine
738656, G01M 1900
Patent
active
048980269
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application corresponding to PCT/DE87/00586 which is based, in turn, on German National Application P 36 42 2717.9 filed 13 December 1986 under the International Convention.
FIELD OF THE INVENTION
My present invention relates to a process for testing driving axles wherein the driving axle is mounted in a test stand driven from the driving side and braked from the driven side.
Further, the invention relates to a device for testing driving axles for motor vehicles, consisting of a driving unit, which is generally linked to the axle transmission by an axle drive shaft and composed of an axle housing with linking elements between the axle shafts and a braking unit opposing resistance to rotation.
The term "driving axle" as used here encompasses the entire unit consisting of axle housing, axle transmission, and one or several driving axles, whereby the axle transmission is driven by an external driven shaft, shifting the thereby produced torque and transmitting it to the axle shaft, which in turn is linked on a driven side with the so-called "driving wheel", which in a test stand is replaced by the so-called "wheel mounting". The ideal image formed by mathematical lines, whereupon the axle shafts revolve and which occasionally are also called "axes", are subsequently called "rotation axes" in order to be better distinguished from the rest.
BACKGROUND OF THE INVENTION
Processes of the afore-described kind and also the corresponding test stands are sufficiently well known. Particularly well known are processes and devices for testing driving axles for trucks, to which the present invention is primarily to be applied. However, the features of the process and the device can also be applied without any further ado to other driving axles, wherein for instance only one single axle shaft is provided, which optionally can be directly driven or whose axle transmission does not have a differential.
The known processes and devices for the testing of driving axles have the disadvantage that the testing is done under conditions which do not match the conditions under which the vehicle will later operate at all or are only able to match them to a limited extent. So, for instance, the axle housing is securely mounted in a frame, while the driven sides of the axle shafts are connected in a wheel mounting with a rotatable part, which is either directly braked or in turn drives a generator, which this way converts the energy transmitted by the axle shaft into electric current and also exerts a braking effect on the shaft, so that the entire axle is loaded with respect to its main function, namely the shifting and transmission of torque.
But later, during its operation, for instance of a driving axle mounted in a truck, conditions arise which cannot be duplicated with the state of the art testing processes and the state of the art testing devices. Instead, in addition to the described purely functional test, further testing of the axle with other test stands and other test methods has to be done, wherein the axle is loaded statically and dynamically, but wherein it can not be rotationally driven. As a result, several tests have to be performed on the axle in succession and these tests actually furnish results of little value.
Finally, further complicated testing has to be done under traffic conditions, i.e. with a driving axle mounted in a vehicle or another device, which are correspondingly time-consuming and costly.
OBJECT OF THE INVENTION
It is the object of the present invention to provide an imporved testing process, as well as a testing device which will make it possible to test driving axles under conditions coming as close as possible to actual operational and traffic conditions.
SUMMARY OF THE INVENTION
This object is attained, in accordance with the invention in a process wherein during the testing of the total function of the axle, consisting of driving and carrying functions, the axle is placed under load by additional forces, whi
REFERENCES:
Test Rigs by Glyco-Antriebstechnik GmbH, pamphlet, in English and German, and explanation of Clamping Test Bench for Drive Axles.
ATZ Automobiletchnische Zeitschrift 75 (1973)9-Dipl Ing E. Gohring, Ing.(grad) W. Hopf, Dipl Ing P. Strifler, Stuttgart, pp. 308-314.
Dubno Herbert
Glyco Antriebstechnik GmbH
Myracle Jerry W.
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