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1. WO1990013799 - APPARATUS AND METHOD FOR MEASURING LOAD AND TORQUE OF A VEHICLE AXLE

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[ EN ]

1. A vehicle load sensor apparatus for measuring the load on one or more spindles of a vehicle axle which comprises:
(a) an axle spindle;
(b) string means having one end attached
to a point adjacent to said axle spindle; and (c) means for determining the load on said spindle by measuring the change of tension in said string means.

"2. The vehicle load sensor apparatus of claim 1 wherein said string means comprises one or more strings attached to a point adjacent to said axle spindle.

3. The vehicle load sensor apparatus of claim 2 wherein said means for measuring the change of tension in said string means further includes means for inducing a vibration in said string means.

4. The vehicle load sensor apparatus of claim 3 wherein said means for measuring the change of tension in said string means further includes means for sensing the frequency of said vibration of said string means.

5. The vehicle load sensor of claim 4 wherein said means for measuring the change of tension in said string means includes a single means capable of both inducing a vibration in said string means and sensing the frequency of said induced vibration in said string means.

6. The vehicle load sensor apparatus of claim 4 wherein said apparatus further includes means for-determining the change of tension in said string means from a no-load state to a loaded state.

7. The vehicle load sensor apparatus of claim 6 wherein said apparatus further includes means for determining said load on said spindle from the change of tension in said string means.

8. The vehicle load sensor apparatus of claim 4 which further includes a second spindle on said axle and wherein an opposite end of said string means is attached adjacent to said second spindle to measure the total load on said axle.

9. The vehicle load sensor apparatus of claim 4 wherein an opposite end of said string means is attached to a fixed point spaced from said spindle.

10. The vehicle load sensor apparatus of claim 9 wherein said fixed point is held at a location substantially fixed relative to the points of attachment of said axle to said vehicle.

11. The vehicle load sensor apparatus of claim 4 which further includes means for supporting said string means at a point spaced from said spindle.

12. The vehicle load sensor apparatus of claim 11 wherein said means for supporting said string means further comprises means for slidably supporting said string means.

13. The vehicle load sensor apparatus of claim 11 wherein said means for supporting said string means further comprises means for non-slidably supporting said string means including means for permitting said string support to move with movement of said string means.

14. A vehicle load and torque sensor apparatus for measuring the load and torque on one or more ends of a vehicle axle which comprises:
(a) an axle spindle;
(b) first string means attached at one end adjacent to said spindle at a point horizontally spaced forward of the axis of said spindle;
(c) second string means attached at one end adjacent to said spindle at a point horizontally spaced to the rear of said axis of said spindle;
(d) means for measuring the change of tension in said first string means;
(e) means for measuring the change of tension in said second string means; and
(f) means for determining the load and torque on said spindle using the respective changes in tension in said first and second string
means.

15. The vehicle load and torque sensor apparatus of claim 14 wherein said means for measuring the respective changes of tension in said first and second string means further includes means for inducing vibrations in said first and second string means.

16. The vehicle load sensor apparatus of claim 15 wherein said means for measuring the respective changes of tension in said first and second string' means further includes means for sensing the fre-quencies of said vibrations in said first and second string means.

17. The vehicle load sensor of claim 16 wherein said means for measuring the respective changes of tension in each of said string means includes a single means capable of both inducing a vibration in said string means and sensing the frequency of said induced vibration of the same said string means.

18. A method for measuring the load on one or more spindles of a vehicle which comprises:
(a) providing an axle spindle;
(b) attaching one end of string means
to a point adjacent to said axle spindle; and

(c) determining the load on said
spindle by measuring the change of tension in said string means.

SUBSTITUTE SHEET

19. The method of claim 18 wherein said step of determining the load on said spindle by measuring the change of tension in said string means further comprises:
(i) measuring the resonant frequency of vibration of said string means;
(ii) determining the tension in said
string means from said resonant
frequency; and
(iϋ) comparing said measured tension
and a previously measured tension corresponding to a no-load condition on said
spindle to determine the load on said
spindle.

20. The method of claim 19 including the further step of inducing a vibration in said string means.

21. The method of claim 20 including the further step of attaching an opposite end of said string means to a point adjacent to a second spindle on a common axle to measure the total load on said axle.

22. The method of claim 20 including the further step of attaching an opposite end of said string means to a fixed point spaced from said spindle to permit independent measurement of the load on said spindle.

23. The method of claim 20 which further includes the step of supporting said string means at a point spaced from said spindle.

24. The method of claim 23 wherein said step of supporting said string means further comprises supporting said string means with a support on which said string means may slide.

25. The method of claim 24 wherein said step of supporting said string means further comprises nonslidably supporting said string means with a string support capable of moving with movement of said string means.

26. A method for measuring the load and torque on one or more ends of an axle which comprises:
(a) attaching one end of a string means adjacent to a spindle at a point horizontally
spaced forward of the axis of said spindle;
(b) attaching a second string means adjacent to said spindle at a point horizontally spaced to the rear of said axis of said spindle;
(c) measuring the tension in said first
string means under load or torque;
(d) measuring the tension in said second
string means under load or torque;
(e) determining the change of tension in said first and second string means from said meas- urements together with the corresponding
measurements made in a no-load state;
(f) determining the load on said spindle from the sum of said measured changes of tension in said first and second string means; and
(g) determining the torque on said end of
said axle from the difference in said measured changes of tension in said first and second string means.

27. The method of claim 26 wherein said respective steps of measuring the tension in said first and second string means further include inducing vibrations in said first and second string means.

28. The method of claim 27 wherein said respective steps of measuring the tension in said first and second string means further include measuring the resonant vibrational frequencies of said first and second string means.