Driving Belt Tension Detection Device and Application Thereof

Abstract

The present invention discloses a driving belt tension detection device, comprising a support (1), wherein one end of the support (1) in the length direction is rotatably connected with a connecting portion (2) for being mounted on a driving wheel, the other end of the support (1) in the length direction is slidely provided with a tension detection part (3) for clamping a driving a belt to measure the tension of the driving belt. The support (1) is also provided with a slide adjusting part (4) for adjusting a slide position of the tension detection part (3). If the detected tension of the driving belt does not meet the requirement, the distance between the driving wheel and a driven is adjusted to adjust the tension on the driving belt to be appropriate. The detection device has high detection accuracy and is less affected by noise.

Claims

1. A driving belt tension detection device comprising a support, wherein a connecting portion is rotatably connected at one end of the support in the length direction for being mounted on a drive wheel, a tension detecting portion is slidably provided at the other end of the support along the length direction of the support, which is used for clamping the driving belt for measuring the value of the tension of the driving belt, and a sliding adjusting portion is provided on the support for adjusting the sliding position of the tension detecting portion.

2. The driving belt tension detection device according to claim 1, wherein the tension detecting portion comprises a connecting rod slidably connected with the support along the length direction of the support, a first compression element and a second compression element provided on the connecting rod for clamping the driving belt, and a pressure sensor connected between the first compression element and the second compression element for converting the value of the tension into an electrical signal.

3. The driving belt tension detection device according to claim 2, wherein a distance adjusting portion is provided on the connecting rod for adjusting the distance between the second compression element and the first compression element.

4. The driving belt tension detection device according to claim 3, wherein a rotating part is provided on each of the first compression element and the second compression element for converting the sliding friction caused by the driving belt into rotating friction.

5. The driving belt tension detection device according to claim 1, wherein the connecting portion comprises a connecting shaft for being inserted into a counter bore at the center of the drive wheel, with an inserting shaft being rotatably connected at one end of the connecting shaft departing from the rotary shaft of the drive wheel, inserted in the support and slidably movable along the inserting direction.

6. The driving belt tension detection device according to claim 2, wherein the sliding adjusting portion comprises a gear rack connected on the connecting rod and extending along the length direction of the support, a gear engaged with the gear rack, and a power unit for driving the gear to rotate.

7. A method for detecting and adjusting the tension of a driving belt by using the detection device according to claim 1 comprising: step 1) adjusting the tension detecting portion to a first position via the sliding adjusting portion and detecting the value of the tension f1 of the driving belt at the first position; step 2) comparing the value of the tension f1 with an upper threshold value Fa and a lower threshold value Fb of a standard tension at the first position; if the value of the tension f1 is between the upper threshold value Fa and the lower threshold value Fb, proceeding to next step, if the value of the tension f1 is not between the upper threshold value Fa and the lower threshold value Fb, adjusting the distance between the drive wheel and the driven wheel so that the value of the tension f1 falls between the upper threshold value Fa and the lower threshold value Fb, and proceeding to next step; step 3) rotating the drive wheel by 120 in a fixed direction; step 4) detecting the tension f1 of the driving belt for the second time, if the value of the tension f1 is still between the upper threshold value Fa and the lower threshold value Fb, proceeding to next step, if the value of the tension f1 is not between the upper threshold value Fa and the lower threshold value Fb, adjusting the distance between the drive wheel and the driven wheel so that the value of the tension f1 falls between the upper threshold value Fa and the lower threshold value Fb, and returning to the step 3) for re-detection; step 5) rotating the drive wheel by 120 in a fixed direction for the second time; step 6) detecting the tension f1 of the driving belt, if the value of the tension f1 is still between the upper threshold value Fa and the lower threshold value Fb, determining that the value of the driving belt tension substantially meets the requirement, if the value of the tension f1 is not between the upper threshold value Fa and the lower threshold value Fb, adjusting the distance between the drive wheel and the driven wheel so that the value of the tension f1 falls between the upper threshold value Fa and a lower threshold value Fb, and returning to the step 3) for re-detection.

8. A method for detecting the error in mounting the rear wheel of a bicycle by using the method for detecting and adjusting the tension of a driving belt according to claim 7 comprising: stopping detection, and determining that the error in mounting the rear wheel of the bicycle does not meet the requirement if the re-detection of returning step 4) back to step 3) successively occurs for three times.

9. The method for detecting the error in mounting the rear wheel of a bicycle according to claim 8, wherein the detection is stopped and it is determined that the error in mounting the rear wheel of the bicycle does not meet the requirement if the re-detection of returning step 5) back to step 3) successively occurs for two times.

10. The method for detecting the error in mounting the rear wheel of a bicycle according to claim 9, wherein the value of the average tension fa1 of the driving belt at three rotation angles of the drive wheel when the tension detecting portion is at the first position is calculated; the tension detecting portion is adjusted to a second position, a third position till an nth position via the sliding adjusting portion along the sliding direction, and the values of average tensions fa2, fa3, . . . , fan of the driving belt at individual positions are respectively detected and calculated, where n is equal to or larger than 2; if the best values of the driving belt tension at individual positions such as the first position, the second position, the third position or the like are Fs1, Fs2, . . . , Fsn, respectively, the errors at individual positions are calculated: F1={square root over ((fa1Fs1).sup.2)}, F2={square root over ((fa2Fs2).sup.2)}, F3={square root over ((fa3Fs3).sup.2)}, . . . , Fn={square root over ((fanFsn).sup.2)}, respectively, and the value of the driving belt tension error is calculated: F=(q1*F1+q2*F2+q3*F3+ . . . +qn*Fn)/n, where q1, q2, q3, . . . , qn are respectively the weighted values of errors corresponding to individual positions where the tension detecting portion is; and the value F of the driving belt tension error is compared with an allowable value Fs of the driving belt tension error; and, if F is smaller than Fs, it is determined that the error in mounting the rear wheel of the bicycle meets the final requirement, otherwise it is determined that the error in mounting the rear wheel of the bicycle is not qualified.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0048] FIG. 1 is a schematic structural diagram of a driving belt tension detection device according to an embodiment of the present application as viewed from the right side thereof

[0049] FIG. 2 is a schematic structural diagram of a driving belt tension detection device according to an embodiment of the present application as viewed from the left side thereof.

[0050] In the drawings: 1. support; 11. kidney-shaped slot; 2. connecting portion; 21. connecting shaft; 22. elastic element; 23. limiting element; 24. inserting shaft; 3. tension detecting portion; 31. first compression element; 32. connecting rod; 321. slidably movable screw bolt; 322. limiting nut; 33. second compression element; 331. sliding slot; 332. rotating part; 34. pressure sensor; 4. sliding adjusting portion; 41. gear rack; 42. gear; 43. power unit; 5. distance adjusting portion; 51. leading screw; 52. fixing nut.

DETAILED DESCRIPTION

[0051] The present application will be described below in detail in combination with drawings and embodiments.

Embodiment 1

[0052] Referring to FIGS. 1 and 2, a driving belt tension detection device comprises a support 1 assuming a strip shape, a connecting portion 2 provided at one end of the support 1 in the length direction and adapted for being mounted on the rotary shaft of a drive wheel, a tension detecting portion 3 provided at the other end of the support 1 and slidably movable along the length direction of the support 1 which clamps the two sides of a driving belt for measuring the amount of the tension on the driving belt, and a sliding adjusting portion 4 provided on the support 1 for adjusting the sliding position of the tension detecting portion 3.

[0053] Referring to FIGS. 1 and 2, the tension detecting portion 3 comprises a connecting rod 32 slidably movable along the length direction of the support 1, a first compression element 31 and a second compression element 33 provided on the connecting rod 32, and a pressure sensor 34 connected between the first compression element 31 and the second compression element 33. In particular, a kidney-shaped slot 11 is provided along the length direction of the support 1 at one end of the support 1 departing from a drive wheel, which passes through the support 1. Also, the connecting rod 32 assumes a strip shape, and has a length direction perpendicular to that of the support 1. A slidably movable screw bolt 321 passing through the kidney-shaped slot 11 is provided on the connecting rod 32, the other end of which is connected with a limiting nut 322 for preventing the slidably movable screw bolt 321 from sliding out of the kidney-shaped slot 11.

[0054] Referring to FIGS. 1 and 2, the first compression element 31 and the second compression element 33 are provided at two ends of the connecting rod 32 along the length direction thereof, and the pressure sensor 34 is provided in the middle of the connecting rod 32. When the first compression element 31 and the second compression element 33 clamp the upper side and the lower side of the driving belt, a compression force is applied to both the first compression element 31 and the second compression element 33 by the driving belt due to its own tension, which is then passed onto the connecting rod 32 by the first compression element 31 and the second compression element 33, and detected by the pressure sensor 34 provided in the middle of the connecting rod 32 to output an electric signal of detected pressure.

[0055] Referring to FIGS. 1 and 2, a distance adjusting portion 5 for adjusting the distance between the first compression element 31 and the second compression element 33 is provided on the connecting rod 32. The distance adjusting portion 5 comprises a leading screw 51 extending from the second compression element 33 to the first compression element 31 and a fixing nut 52 connected on the leading screw 51. The leading screw 51 is rotatably connected on the connecting rod 32, and the fixing nut 52 rotates on the leading screw 51 and presses against one end of the connecting rod 32, so as to fix the leading screw 51 on the connecting rod 32. Moving up or down the position of the leading screw 51 can adjust the distance between the first compression element 31 and the second compression element 33, and thus driving belts having different widths can be put therebetween for detection.

[0056] Referring to FIGS. 1 and 2, a sliding slot 311 and a sliding slot 331 disposed opposite to each other and extending along the length direction of the support 1 are respectively provided on the first compression element 31 and the second compression element 33 for receiving one edge of a driving belt, respectively. In addition, in order to reduce the friction between the driving belt and the first compression element 31 and the second compression element 33, a rotating part 332 (the one in the sliding slot 311 is not shown) is provided in each of the sliding slot 311 and the sliding slot 331, which is a rotary roll rotatably connected on the second compression element 33 for pressing against the driving belt.

[0057] Referring to FIGS. 1 and 2, the sliding adjusting portion 4 comprises a gear rack 41 perpendicular to the connecting rod 32 and integrally connected on the connecting rod 32, a gear 42 engaged with the gear rack 41, and a power unit 43 for driving the gear 42 to rotate. The gear 41 extends in a direction in parallel with the length direction of the support 1. In one embodiment, the power unit 43 is an electric motor. In other embodiments, the power unit 43 can be a cylinder.

[0058] Referring to FIGS. 1 and 2, the connection part 2 comprises an inserting shaft 24 inserted in the support 1 and a connection shaft 21 rotatably connected with the inserting shaft 24. The inserting shaft 24 is on the same side of the support 1 as the tension detecting portion 3. It is inserted in a through hole in the end of the support 1 departing from the first compression element 31 along the length direction of the support 1, and is slidably movable along the direction of the through hole. One end of the inserting shaft 24 departing from the through hole is rotatably connected with the connecting shaft 21, that is, the connecting shaft 21 is sleeved outside the inserting shaft 24 and can rotate concentrically therewith. In addition, an elastic element 22, for example, a spring, is contact connected between the connecting shaft 21 and the support 1. In other embodiments, the elastic element 22 can be a rubber pad, a balloon, or the like. A limiting element 23 for preventing the inserting shaft 24 from falling off the through hole is connected at the end of the inserting shaft 24 departing from the connecting shaft 21. In one embodiment, the limiting element is a liming ring disposed around the inserting shaft 24.

Embodiment 2

[0059] A method for detecting and adjusting the tension of a driving belt by using a detection device comprises:

[0060] step 1) adjusting a tension detecting portion to a first position via a sliding adjusting portion and detecting the value of the tension f1 of a driving belt at the first position;

[0061] step 2) comparing the value of the tension f1 with an upper threshold value Fa and a lower threshold value Fb of a standard tension at the first position;

[0062] if the value of the tension f1 is between the upper threshold value Fa and the lower threshold value Fb, proceeding to next step,

[0063] if the value of the tension f1 is not between the upper threshold value Fa and the lower threshold value Fb, adjusting the distance between a drive wheel and a driven wheel so that the value of f1 falls between the upper threshold value Fa and the lower threshold value Fb, and proceeding to next step;

[0064] step 3) rotating the drive wheel by 120 in a fixed direction;

[0065] step 4) detecting the tension f1 of the driving belt for the second time,

[0066] if the value of the tension f1 is still between the upper threshold value Fa and the lower threshold value Fb, proceeding to next step,

[0067] if the value of the tension f1 is not between the upper threshold value Fa and the lower threshold value Fb, adjusting the distance between the drive wheel and the driven wheel so that the value of f1 falls between the upper threshold value Fa and the lower threshold value Fb, and returning to the step 3) for re-detection;

[0068] step 5) rotating the drive wheel by 120 in a fixed direction for the second time;

[0069] step 6) detecting the tension f1 of the driving belt,

[0070] if the value of the tension f1 is still between the upper threshold value Fa and the lower threshold value Fb, determining that the value of the tension of the driving belt substantially meets the requirement,

[0071] if the value of the tension f1 is not between the upper threshold value Fa and the lower threshold value Fb, adjusting the distance between the drive wheel and the driven wheel so that the value of f1 falls between the upper threshold value Fa and a lower threshold value Fb, and returning to the step 3) for re-detection.

Embodiment 3

[0072] Based on a method for detecting and adjusting the tension of a driving belt by using a driving belt detection device, a method for detecting the error in mounting the rear wheel of a bicycle comprises:

[0073] stopping detection and determining that the error in mounting the rear wheel of the bicycle does not meet the requirement if the re-detection of returning step 4) back to step 3) successively occurs for three times during the process of detecting and adjusting the tension of a driving belt.

[0074] In addition, the detection should be stopped and it should be determined that the error in mounting the rear wheel of the bicycle does not meet the requirement if the re-detection of returning step 5) back to step 3) successively occurs for two times.

[0075] Finally, upon the detecting and adjusting of the driving belt tension substantially meets the requirement, the value of the average tension fa1 of the driving belt at three rotation angles of the drive wheel when the tension detecting portion is at the first position is calculated;

[0076] the tension detecting portion is adjusted to a second position, a third position till an n.sup.th position via the sliding adjusting portion along the sliding direction, and the values of average tensions fa2, fa3, . . . , fan of the driving belt at individual positions are respectively detected and calculated, where n is equal to or larger than 2;

[0077] if the best values of the driving belt tension at individual positions such as the first position, the second position, the third position or the like are Fs1, Fs2, . . . , Fsn, respectively, the errors at individual positions are calculated: F1={square root over ((fa1Fs1).sup.2)}, F2={square root over ((fa2Fs2).sup.2)}, F3={square root over ((fa3Fs3).sup.2)}, . . . , Fn={square root over ((fanFsn).sup.2)}, respectively, and then the value of driving belt tension error is calculated: F=(q1*F1+q2*F2+q3*F3+ . . . +qn*Fn)/n, where q.sub.1, q.sub.2, q.sub.3, . . . , q.sub.n are respectively the weighted values of errors corresponding to individual positions where the tension detecting portion is; and

[0078] the value F of the driving belt tension error is compared with an allowable value Fs of the driving belt tension error; and, if F is smaller than Fs, it is determined that the error in mounting the rear wheel of the bicycle finally meets the requirement, otherwise it is determined that the error in mounting the rear wheel of the bicycle is not qualified.

[0079] What is provided above is merely the preferred embodiments according to the present application, and the protection scope of the present application is not limited to the above embodiments. On the contrary, all the technical solutions obtained based on the concepts of the present application should fall with in the protection scope of the present application. It should be noted that, for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present applications, which should be also considered as falling within the protection scope of the present application.