Adjusting structure for torsion of centrifugal block torsion spring of variable-speed hub

Abstract

The utility model discloses a variable speed hub centrifugal block torsion spring torsion adjusting structure which comprises a threaded hole formed in a hub shell, a notch formed in an end cover and an adjusting screw arranged in the threaded hole in a matched mode, the notch is communicated with an inwards-concave structure on the end cover, one end of the adjusting screw penetrates into the notch and the inwards-concave structure, and the other end of the adjusting screw penetrates into the end cover. And a torsion spring sleeve is sleeved on the torsion spring, is positioned between the pins at the two ends of the torsion spring, and is limited by the pins at the two ends of the torsion spring. On the premise of not increasing extra space and not greatly changing the structure of parts, the torsion spring is sleeved with the torsion spring sleeve, and the torsion spring sleeve is used for preventing the pin from being deformed to be separated from the inner concave structure or separated from the end face of the adjusting screw after the adjusting screw is rotated and the torsion spring is stressed.

Description

Technical Field

[0001] The utility model relates to a non-motor vehicle, in particular to a speed change device. Background Art

[0002] Patent application publication number CN 116495093 A discloses a variable-speed hub, comprising a hub housing, a first-stage drive assembly, a second-stage drive assembly, and a third-stage drive assembly. The first-stage drive assembly directly drives the hub housing via a first pawl. The second-stage drive assembly comprises a second clutch and a second spline. The second clutch is secured to the hub housing via a second pawl and rotates therewith to achieve power transmission. The second pawl is located on the outer periphery of the second spline. The third-stage drive assembly comprises a third clutch and a third spline. The third clutch is secured to the hub housing via a third pawl and rotates therewith to achieve power transmission. The third pawl is located on the outer periphery of the third spline.

[0003] The driver rotates under the influence of a flywheel or other external force. Centrifugal force causes the first pawl to open and couple with the ring gear (fixed to the inner wall of the hub shell). This rotation of the driver drives the hub shell to rotate. Since the hub shell is connected to the wheel, the hub shell follows the wheel.

[0004] When the hub shell is in the first speed stage, the second pawl and the second spline are in a decoupled state, the third pawl and the third spline are in a decoupled state, the first pawl and the gear ring are coupled, the second spline is in idle rotation, and the third spline is in idle rotation.

[0005] When the hub shell reaches the second speed, the speed of the hub shell is greater than the speed of the driving body, and the speed of the gear ring fixedly connected to the hub shell is greater than the speed of the first pawl. The first pawl is in an overrunning state and has no driving effect on the hub. As the speed of the hub shell increases, under the action of centrifugal force, the second centrifugal block following the hub shell rotates radially, driving the second clutch plate to rotate a certain angle. The second pawl, which was originally restricted by the second clutch plate, can rotate toward the center of rotation and couple with the second spline. At this time, the power is transmitted through the driving body, the gear ring of the second planetary gear set, the second spline, the second pawl, and the hub shell. At this time, the third pawl and the third spline are in a decoupled state, and the third spline is idling.

[0006] When the hub shell reaches the third rotational speed, the speed of the second pawl, which follows the hub shell, exceeds the speed of the second spline, and the second pawl is in an overrunning state. At this point, the first pawl is also in an overrunning state, and neither the first pawl nor the second pawl has any driving effect on the hub shell. As the hub shell speed increases, centrifugal force causes the third centrifugal weight, which follows the hub shell, to rotate radially, driving the third clutch plate to rotate a certain angle. The third pawl, which was previously restricted by the third clutch plate, is now able to rotate toward the center of rotation and couple with the third spline. At this point, power is transmitted through the drive body, the ring gear of the second planetary gear set, the planetary carrier of the third planetary gear set, the ring gear of the third planetary gear set, the third spline, the third pawl, and the hub shell.

[0007] When the hub shell speed is higher than the third speed, the first pawl ratchet, the second pawl ratchet and the third pawl ratchet are all in the overrunning state.

[0008] The second centrifugal block is installed on the second end cover through the installation shaft. The installation shaft is equipped with a reset spring. The reset spring adopts a torsion spring. The pin at one end of the torsion spring is against the second centrifugal block, and the pin at the other end of the torsion spring is against the concave structure on the second end cover.

[0009] The centrifugal force of the second centrifugal block overcomes the restoring force of the restoring spring and rotates radially, driving the second clutch plate to rotate a certain angle. The second clutch plate releases the second pawl. After being released, the second pawl rotates radially and engages with the second spline, so that the hub shell is directly driven by the second spline.

[0010] The third centrifugal mass is mounted on the third end cap via a mounting shaft. The mounting shaft is equipped with a return spring, which is a torsion spring. A pin at one end of the torsion spring abuts against the third centrifugal mass, while a pin at the other end abuts against a concave structure on the third end cap. The working principle of the third centrifugal mass is the same as that of the second centrifugal mass and will not be further described.

[0011] By adjusting the torque of the return spring, the clutch's critical shift speed can be adjusted accordingly. To achieve this, a threaded hole is provided in the hub housing, which accommodates an adjustment screw. A notch is provided in the edge of the second / third end cap, allowing the adjustment screw to penetrate the notch and engage the pin at one end of the torsion spring. When the adjustment screw acts on the torsion spring pin, the torsion spring pin may deform and separate from the end face of the adjustment screw, rendering the adjustment screw unable to adjust the torsion spring's torque. Utility Model Content

[0012] The technical problem solved by the utility model is that the torsion force of the torsion spring is adjusted by adjusting the screw by acting on the pin of the torsion spring. The pin of the torsion spring may be separated from the end face of the adjusting screw due to deformation, resulting in the adjusting screw being unable to adjust the torsion force of the torsion spring.

[0013] In order to solve the above technical problems, the utility model provides the following technical solutions: a structure for adjusting the torque of the torsion spring of the centrifugal block of the speed hub, comprising a threaded hole provided on the hub shell, a notch provided on the end cover, and an adjusting screw fitted in the threaded hole, the notch being connected to the concave structure on the end cover, one end of the adjusting screw penetrating into the notch and the concave structure, and abutting against the pin of the torsion spring located in the concave structure, a torsion spring sleeve being provided on the torsion spring, the torsion spring sleeve being located between the pins at both ends of the torsion spring, and the torsion spring sleeve being limited by the pins at both ends of the torsion spring.

[0014] The pin at one end of the torsion spring abuts against the step structure on the centrifugal block, or the pin cooperates with the pin hole on the centrifugal block, thereby achieving the connection between the pin at one end of the torsion spring and the centrifugal block. The pin at the other end of the torsion spring abuts against the inner wall of the concave structure and against the adjusting screw that penetrates into the concave structure. Since a torsion spring sleeve is provided on the torsion spring and the torsion spring sleeve is limited by the pins at both ends of the torsion spring, that is, the length of the torsion spring sleeve reaches the distance between a pair of pins of the torsion spring, when the adjusting screw presses down on the pin of the torsion spring, the deformed torsion spring is confined within the torsion spring sleeve, preventing the pin under the action of the adjusting screw from being excessively deformed or displaced, thereby preventing it from detaching from the end face of the adjusting screw or escaping from the concave structure. Moreover, the end face of the torsion spring sleeve acts as a limiter on the pin of the torsion spring, and the deformed pin moves along the end face of the torsion spring sleeve, preventing it from detaching from the end face of the adjusting screw or escaping from the concave structure.

[0015] The axial hole of the mounting shaft connecting the centrifugal weight to the end cap is located in the concave structure, and one end of the torsion spring sleeve is embedded in the concave structure. In this way, the end surface of the torsion spring sleeve and the concave structure jointly limit the pin of the torsion spring, preventing it from separating from the end surface of the adjusting screw or falling out of the concave structure when deformed by force.

[0016] One end of the concave structure is a semicircular structure, into which the torsion spring sleeve fits. The semicircular structure defines the position of the torsion spring sleeve, stabilizing it. Consequently, the torsion spring remains stable when deformed by force. Consequently, the torsion spring pin remains stable when deformed by force, making it less likely to separate from the end face of the adjusting screw or escape from the concave structure.

[0017] The pin at one end of the torsion spring abuts against the inner wall of the concave structure. This way, the pin is trapped between the end face of the torsion spring sleeve and the inner wall of the concave structure. When the adjusting screw pushes down on the pin, the pin deforms between the end face of the torsion spring sleeve and the inner wall of the concave structure, preventing it from deviating from the end face of the adjusting screw or falling out of the concave structure.

[0018] The utility model provides a torsion spring sleeve on the torsion spring without increasing additional space and without significantly changing the structure of parts, so as to prevent the pin of the torsion spring from being deformed and falling out of the concave structure or the end surface of the adjusting screw when the torsion spring is subjected to force after rotating the adjusting screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the speed hub;

[0021] Figure 2 This is an exploded view of the speed hub;

[0022] Figure 3 for Figure 2 A schematic diagram of the combined structure of the third end cover 40 and its accessories;

[0023] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 for Figure 3 Exploded diagram.

[0025] Explanation of symbols in the figure:

[0026] 10. Second end cover;

[0027] 20. Hub shell; 21. Threaded hole; 22. Adjustment screw;

[0028] 30. Third centrifugal block; 31. Mounting shaft; 32. Torsion spring; 33. Torsion spring pin; 34. Torsion spring sleeve;

[0029] 40. Third end cap; 41. Concave structure; 42. Notch; 43. Semicircular structure;

[0030] 50. The third clutch plate; 51. The third pawl. DETAILED DESCRIPTION

[0031] The patent document with application publication number CN 116495093 A involves a speed-changing hub, in which the second centrifugal weight is installed on the second end cover via a mounting shaft, and the mounting shaft is equipped with a return spring. The return spring adopts a torsion spring, and the pin at one end of the torsion spring is connected to the second centrifugal weight, and the pin at the other end of the torsion spring is against the concave structure on the second end cover.

[0032] The centrifugal force of the second centrifugal block overcomes the reset force of the reset spring and rotates radially, driving the second clutch plate to rotate a certain angle. The second clutch plate releases the second pawl, and the released second pawl rotates radially and engages with the second spline, so that the hub shell is directly driven by the second spline.

[0033] refer to Figure 3 、 Figure 4The third centrifugal block 30 is installed on the third end cover 40 through the mounting shaft 31. The mounting shaft is equipped with a reset spring. The reset spring adopts a torsion spring 32. The pin at one end of the torsion spring is connected to the third centrifugal block, and the pin 33 at the other end of the torsion spring is against the concave structure 41 on the third end cover.

[0034] The centrifugal force of the third centrifugal weight 30 overcomes the restoring force of the restoring spring and rotates radially, driving the third clutch plate 50 to rotate a certain angle. The third clutch plate releases the third pawl 51. After being released, the third pawl rotates radially and engages with the third spline, so that the hub shell 20 is directly driven by the third spline.

[0035] A structure for adjusting the torsion force of a torsion spring of a speed-changing hub centrifugal block can adjust the critical speed of clutch shifting by adjusting the torsion force of a return spring, that is, the torsion force of the torsion spring.

[0036] Combine Figures 1 to 4 The adjustment structure of the torsion spring torque of the speed hub centrifugal block includes a threaded hole 21 formed on the hub shell 20, a notch 42 formed on the second end cover 10 / the third end cover 40, and an adjusting screw 22 fitted in the threaded hole 21. The notch is connected to the concave structure 41 on the second end cover 10 / the third end cover 40. One end of the adjusting screw penetrates into the notch and the concave structure, and abuts against the pin 33 of the torsion spring located in the concave structure. A torsion spring sleeve 34 is provided on the torsion spring, and the torsion spring sleeve is located between the pins at both ends of the torsion spring 32, and the torsion spring sleeve is limited by the pins at both ends of the torsion spring.

[0037] Since a torsion spring sleeve 34 is sleeved on the torsion spring and the torsion spring sleeve is limited by the pins 33 at both ends of the torsion spring 32, when the adjusting screw 22 presses down the pins 33 of the torsion spring, the deformed torsion spring 32 is restricted in the torsion spring sleeve 34, preventing the pins affected by the adjusting screw 22 from being excessively deformed or displaced, thereby causing them to detach from the end surface of the adjusting screw 22 or detach from the concave structure 41. Moreover, the end surface of the torsion spring sleeve 34 acts as a limit on the pins of the torsion spring, and the deformed pins move along the end surface of the torsion spring sleeve, preventing them from detaching from the end surface of the adjusting screw 22 or detaching from the concave structure 41.

[0038] Combine Figure 3 、 Figure 4 The axial hole of the mounting shaft 31 connecting the second / third centrifugal weight 30 and the second / third end cap 10 / 40 is located in the concave structure, and one end of the torsion spring sleeve 34 is embedded in the concave structure 41. In this way, the end surface of the torsion spring sleeve 34 and the concave structure 41 jointly restrain the pin 33 of the torsion spring, preventing it from separating from the end surface of the adjusting screw 22 or from the concave structure 41 when deformed by force.

[0039] refer to Figure 5One end of the concave structure 41 is a semicircular structure 43, into which the torsion spring sleeve 34 fits. The semicircular structure 43 defines the position of the torsion spring sleeve 34, stabilizing it. This, in turn, stabilizes the torsion spring 32 when deformed by force. Accordingly, the torsion spring pin 33 remains stable when deformed by force, making it less likely to separate from the end face of the adjusting screw or from the concave structure 41.

[0040] The pin 33 at one end of the torsion spring abuts against the inner wall of the concave structure 41. Thus, the pin 33 of the torsion spring is trapped between the end surface of the torsion spring sleeve 34 and the inner wall of the concave structure 41. When the adjusting screw 22 presses down on the pin, the pin deforms between the end surface of the torsion spring sleeve 34 and the inner wall of the concave structure 41 and does not deviate from the end surface of the adjusting screw 22 or escape from the concave structure 41.

[0041] The above content is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation method and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A structure for adjusting the torsion force of a torsion spring in a centrifugal hub, comprising a threaded hole in the hub housing, a notch in the end cap, and an adjusting screw that fits into the threaded hole. The notch communicates with a recessed structure in the end cap, and one end of the adjusting screw penetrates the notch and recessed structure to abut against a pin of the torsion spring located in the recessed structure. The structure is characterized by: A torsion spring sleeve is provided on the torsion spring. The torsion spring sleeve is located between the pins at both ends of the torsion spring, and the torsion spring sleeve is limited by the pins at both ends of the torsion spring.

2. The structure for adjusting the torsion force of the torsion spring of the centrifugal weight of the speed hub according to claim 1, characterized in that: The shaft hole of the mounting shaft connecting the centrifugal block and the end cover is located in the concave structure, and one end of the torsion spring sleeve is embedded in the concave structure.

3. The structure for adjusting the torsion force of the torsion spring of the centrifugal weight of the speed hub according to claim 2, characterized in that: One end of the concave structure is a semicircular structure, and the torsion spring sleeve is fitted in the semicircular structure.

4. The structure for adjusting the torsion force of the torsion spring of the centrifugal weight of the speed-changing hub according to claim 2, characterized in that: The pin at one end of the torsion spring abuts against the inner side wall of the concave structure.

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