A belt wheel structure and a belt drive

Abstract

The utility model relates to a kind of pulley structure and belt driving device, the pulley structure includes pulley body, rotating shaft, rotating shaft sleeve and ejector rod etc., the pulley body is equipped with first central hole, slot is opened on its inner wall;The rotating shaft is equipped with second central hole, rotating shaft and rotating shaft sleeve coaxial setting in first central hole, the side wall of rotating shaft and rotating shaft sleeve is opened with several position corresponding through-hole, constitute multiple ball rotation space directly opposite the slot;The ejector rod is set in the second central hole of rotating shaft, and the outer wall of ejector rod is provided with multiple recessed concession groove to rotation center line, and the bottom of ejector rod is equipped with reset spring;The position of the ball in ball rotation space is limited by the outer wall of slot and ejector rod.The utility model connects and separates between pulley body and rotating shaft by adjusting the position of ejector rod in first central hole, to further complete the loading and unloading of pulley structure, facilitate equipment maintenance.

Description

Technical Field

[0001] This utility model relates to the field of belt pulley technology, specifically to a belt pulley structure and belt drive device. Background Technology

[0002] A pulley is a widely used mechanical component. When used as a driving pulley, the inner wall of its central hole is typically fixed to the output shaft of a power source by keys, pins, or other means, and rotates with the output shaft, thereby driving the belt wound around it to transmit power. When used as a driven pulley, the inner wall of its central hole is also mostly connected to the connecting shaft on the device to be driven by keys, pins, or other means. The driven pulley rotates under the pulley's pull, transmitting power to the device being driven.

[0003] In practical applications, pulleys require routine maintenance. When a pulley is damaged, it generally needs to be repaired or replaced promptly. In the aforementioned methods of fixing pulleys to rotating or connecting shafts using keys, pins, etc., the connection space is relatively narrow. It's inconvenient to find a suitable point of force to open the key embedded in the keyway, or there may not be enough space to open the cotter pin inserted into the pin shaft. Both methods present difficulties in disassembling the pulley from the driven equipment, increasing equipment maintenance and operating costs.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model discloses a pulley structure and a belt drive device.

[0006] The technical solution adopted in this embodiment of the utility model is as follows: A pulley structure, comprising: The pulley body has a first central hole, and the inner wall of the first central hole has two or more grooves, all of which are parallel to the rotation center line of the pulley body. A rotating shaft is provided with a second central hole, and a number of first through holes are opened at intervals on the side wall of the rotating shaft facing the groove. A rotating shaft sleeve is fitted onto the outside of the rotating shaft and coaxially disposed in the first central hole; several second through holes corresponding to the positions of the first through holes are opened on the side wall of the rotating shaft sleeve, forming multiple ball bearing rotation spaces facing the groove. A push rod is provided in the second central hole. The outer wall of the push rod is provided with an inwardly recessed transfer groove. The number and distribution of the transfer grooves are the same as those of the first through hole. A return spring is provided at the bottom end of the push rod. Several balls are placed in the ball rotation space, and the positions of the balls on both sides are restricted by the outer walls of the groove and the top rod.

[0007] Preferably, the number of first through holes corresponding to each groove is the same and their positions correspond one-to-one.

[0008] Preferably, the push rod is configured as a short shaft, with its top end not exceeding the first center hole in use, and its bottom end connected to the reset spring; the lengths of the rotating shaft and the rotating shaft sleeve are both adapted to the length of the push rod.

[0009] Preferably, the push rod is configured as a long axis, with its top end extending beyond the preset length of the first center hole in use, and its bottom end connecting to the reset spring; the lengths of the rotating shaft and the rotating shaft sleeve are both adapted to the length of the push rod.

[0010] Preferably, the push rod includes a coaxially connected abutment section, a transfer section, and a connecting section, wherein the abutment section is clearance-fitted with the second center hole, the transfer section is provided with the transfer groove, the connecting section is located at the bottom end of the push rod, and the connecting section is fixedly connected to one end of the return spring.

[0011] Preferably, the surfaces of the groove and the ball that engage with each other, as well as the surfaces of the transfer groove and the ball that engage with each other, are both configured as arc-shaped structures.

[0012] Preferably, the end face of the pulley body and the top end of the push rod on the same side is provided with a tool hole.

[0013] A belt-driven device includes a power source, a belt, a driving pulley, and a driven pulley. The belt drives the driving pulley and the driven pulley. The driving pulley is configured as described above. The power source has a power output end, which is connected to one end of a rotating shaft and a return spring via a transmission assembly.

[0014] Preferably, the power source is an electric motor, the power output end of the electric motor is configured as a power output shaft, and the transmission component between the power output shaft and the rotating shaft is configured as a meshing bevel gear set.

[0015] The beneficial effects of this utility model embodiment are as follows: (i) The pulley structure proposed in this utility model has an external force transmission structure consisting of a rotating shaft sleeve, a rotating shaft, a push rod, a return spring, and balls installed in the central hole of the pulley body. By adjusting the position of the push rod in the central hole of the pulley body, the connection and separation between the pulley body and the rotating shaft can be quickly realized, thereby completing the installation and removal of the pulley structure. This facilitates the maintenance of the equipment to which the pulley structure is used and reduces the equipment maintenance cost.

[0016] (II) The belt drive device proposed in this utility model adopts the above-mentioned belt pulley structure for its drive wheel. The power output end of the power source is connected to the rotating shaft through a transmission component. This can limit the balls to be positioned between the groove on the inner wall of the pulley body, the ball rotation space, and the outer wall of the rotating shaft, thus achieving a reliable connection between the rotating shaft and the pulley body. Alternatively, by operating the push rod, the balls can be partially inserted into the transfer groove on the outer wall of the rotating shaft, and then the pulley body can be pulled to disengage the pulley body from the rotating shaft, thus achieving the separation between the rotating shaft and the pulley body. This facilitates disassembly and assembly, and reduces equipment maintenance and usage costs. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the pulley structure proposed in Embodiment 1 of this utility model.

[0018] Figure 2 for Figure 1 A cross-sectional view along the AA direction.

[0019] Figure 3 for Figure 1 A three-dimensional view of the central belt pulley body.

[0020] Figure 4 for Figure 1 A 3D view of the central axis.

[0021] Figure 5 for Figure 1 A 3D view of the intermediate shaft connector.

[0022] Figure 6 for Figure 1 A 3D view of the center rod.

[0023] Figure 7 A perspective view of the first wrench used to unlock the ball bearing position in Embodiment 1.

[0024] Figure 8 This diagram illustrates the use of the first wrench to unlock the ball bearing and reset it after unlocking.

[0025] Figure 9 This is a cross-sectional view of the pulley structure proposed in Embodiment 2 of this utility model.

[0026] Figure 10 A perspective view of the second wrench used to unlock the ball bearing position in Embodiment 2.

[0027] Figure 11 This diagram illustrates the use of a second wrench to unlock the ball bearing and reset it after unlocking.

[0028] Figure 12 This is an example diagram of the belt drive device proposed in Embodiment 3 of this utility model.

[0029] Figure 13 for Figure 11 A schematic diagram of the power source and the rotating shaft.

[0030] In the picture: 1. Pulley body; 11. First center hole; 12. Groove; 13. Tool hole; 2. Shaft; 21. Second center hole; 22. First through hole; 3. Shaft sleeve; 31. Second through hole; 4. Push rod; 41. Abutting section; 42. Transfer section; 421. Transfer groove; 43. Connecting section; 5. Return spring; 6. Ball bearing; 7. First wrench; 71. Wrench body; 72. First center ejector; 73. First positioning component; 8. Second wrench; 81. Upper plate; 82. Lower plate; 83. Connecting component; 84. Second center ejector; 85. Second positioning component; 86. Through hole; 101. Power source; 102. Belt; 103. Drive wheel; 104. Driven wheel. Detailed Implementation

[0031] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the device proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, only used to conveniently and clearly assist in illustrating the purpose of the embodiments of this utility model. Please refer to the accompanying drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0033] Example 1 Figure 1 This is a cross-sectional view of the pulley structure proposed in Embodiment 1 of this utility model; Figure 2 for Figure 1 A cross-sectional view along the AA direction. (e.g.) Figure 1 and Figure 2 As shown, the pulley structure of this embodiment includes a pulley body 1, a shaft 2, a shaft sleeve 3, a push rod 4, a return spring 5, and several balls 6.

[0034] Figure 3 for Figure 1A perspective view of the central belt pulley body 1. Figure 2 and Figure 3 As shown, in this embodiment, the pulley body 1 has a first central hole 11, and the inner wall of the first central hole 11 has three grooves 12. The grooves 12 are lower than the surface of the inner wall and are preferably bent inward to form an arc-shaped structure. The long side of the groove 12 is parallel to the rotation center line of the pulley body 1, and the three grooves 12 are symmetrically distributed with respect to the rotation center line of the pulley body 1.

[0035] Figure 4 for Figure 1 A 3D view of the transfer shaft 2. (See image below.) Figure 1 , Figure 4 As shown, in this embodiment, the rotating shaft 2 is provided with a second central hole 21, and a plurality of first through holes 22 are opened at intervals on the side wall of the rotating shaft 2 opposite to the groove 12. Figure 5 for Figure 1 A 3D view of the intermediate shaft connector 3. (See diagram below.) Figure 1 , Figure 5 As shown, in this embodiment, the rotating shaft sleeve 3 is disposed between the rotating shaft 2 and the pulley body 1. The rotating shaft sleeve 3 is coaxially sleeved on the outside of the rotating shaft 2, and a second through hole 31 is formed on the side wall of the rotating shaft sleeve 3, corresponding to the position of the first through hole 22. Through this design, the first through hole 22 and the second through hole 31 can form a tightly structured ball bearing rotation space. At the same time, rotating shaft sleeves 3 of different thicknesses can be designed to compensate for the problem of excessive gap between the outer wall of the rotating shaft 2 and the inner wall of the pulley body 1.

[0036] Figure 6 for Figure 1 A 3D view of the center push rod 4. (See diagram below.) Figure 1 , Figure 6 As shown, in this embodiment, the push rod 4 is placed in the second central hole 21. The outer wall of the push rod 4 has the same number and distribution of transfer grooves 421 as the first through hole 22. The transfer grooves 421 are recessed inward from the surface of the push rod 4, and a return spring 5 is provided at the bottom end of the push rod 4. Similarly, the longitudinal section of the transfer groove 421 is preferably configured to be bent inward to form an arc-shaped structure. One ball 6 is provided in each ball's rotation space, and the positions of the balls 6 on both sides are limited by the inner wall of the groove 12 and the outer wall of the push rod 4. This embodiment uses six balls 6 and three grooves 12 as an example. In actual use, the number of balls 6 and grooves 12 can be flexibly set according to specific needs. The balls 6 are preferably steel balls, which have high strength and long service life.

[0037] When the pulley structure proposed in this utility model is used, the shaft sleeve 3, shaft 2, push rod 4, return spring 5, and ball bearings 6 constitute an external force source transmission structure. When the pulley structure needs to be installed on the application equipment, the pulley body 1 is installed on the outside of the shaft 2 and shaft sleeve 3, which are sleeved together. Under the action of the return spring 5, the push rod 4 keeps the shaft 2 in the initial position. At this time, the rotation space of the ball bearings is misaligned with the transfer groove 421 on the shaft 2, and part of the ball bearings 6 enter the groove 12. The ball bearings 6 are limited between the groove 12, the outer wall of the shaft 2 and the first central hole 11, realizing the engagement between the inner wall of the pulley body 1 and the shaft 2. Conversely, when it is necessary to remove the pulley structure installed on the application equipment, press the top of the push rod 4 to move the push rod 4 down in the first center hole 11 of the pulley body 1, so that the transfer groove 421 moves down to the ball rotation space. The balls 6 in the ball rotation space move into the transfer groove 421, and the other side of the balls 6 is released from the constraint of the groove 12 of the pulley body 1, realizing the separation of the pulley body 1 and the shaft 2. Then the pulley body 1 is pulled out, thus completing the disassembly of the pulley structure.

[0038] Furthermore, Figure 6 for Figure 1 A 3D view of the center push rod 4. (See diagram below.) Figure 1 , Figure 6 As shown, in this embodiment, the push rod 4 includes a connecting section 41, a yielding section 42, and a connecting section 43. The abutting section 41 is clearance-fitted with the second central hole 21, and the yielding section 42 is disposed between the two abutting sections 41. The yielding section 42 has the same number and distribution of yielding grooves 421 as the first through hole 22. The cross-sectional dimension of the connecting section 43 is smaller than that of the second central hole 21. A return spring 5 is sleeved on the connecting section 43. In this embodiment, the abutting section 41, the yielding section 42, and the connecting section 43 are set as cylindrical structures of different diameters, making the push rod 4 move more smoothly in the first central hole 11. In reality, the shape and structure of the abutting section 41, the yielding section 42, and the connecting section 43 are not limited to the form of cylinders; they only need to be able to move in the first central hole 11 when subjected to external thrust.

[0039] It should be noted that, as Figure 1 As shown, in this embodiment, the push rod 4 is configured as a short shaft, with a connecting section 43 at one end and an abutment section 41 at the other end, which does not extend beyond the second center hole 21 during use. The lengths of the rotating shaft 2 and the rotating shaft sleeve 3 are both adapted to the length of the push rod 4. This design makes the pulley structure of the device more aesthetically pleasing and facilitates the design of relatively simple disassembly tools.

[0040] Furthermore, such as Figure 3As shown, in this embodiment, tool holes 13 are provided on the end faces of the pulley body 1 and the top of the push rod 4, which are located on the same side. With this design, a special tool can be used to press the top plate 4, improving the disassembly and assembly efficiency of the pulley structure. Figure 7 A perspective view of the first wrench 7 for unlocking the position of ball 6 in Embodiment 1; Figure 8 This diagram illustrates the use of the first wrench 7 to unlock and reset the ball bearing 6. Specifically, as shown... Figure 7 and Figure 8 As shown, this embodiment includes a first wrench 7, comprising a wrench body 71 with an operating part and a handle part. A first central ejector 72 of a certain length is provided on the same side of the operating part, and first positioning members 73 are correspondingly provided on both sides of the first central ejector 72. When the first positioning member 73 is inserted into the corresponding tool hole 13, the first central ejector 72 aligns with the top of the push rod 4. Then, the first wrench 7 is pressed down, causing the push rod 4 and the transfer groove 421 to move downwards, and the ball bearing 6 to slide inwards. The ball bearing 6 unlocks, disengaging the short-axis rotating shaft 2 from the pulley body 1. After the first wrench 7 is removed, the push rod 4 springs upwards under the action of the return spring 5, and the ball bearing 6 returns to its original position. This design provides ample operating space and convenient force application during disassembly, improving disassembly efficiency.

[0041] Example 2 Figure 9 This is a cross-sectional view of the pulley structure proposed in Embodiment 2 of this utility model. This embodiment proposes a pulley structure that differs from Embodiment 1 in that the push rod 4 is set as a long axis. Specifically, as shown... Figure 8 As shown, one end of the long shaft has a connecting section 43, and the other end is set as an abutment section 41, which extends beyond the preset length of the first center hole 11 when in use. The design of the long shaft and the short shaft has no impact on the operation of the pulley structure; only the structure of the corresponding operating tool is different. The operating tool structure of the long shaft is relatively complex, but the operation is still convenient.

[0042] Figure 10 A perspective view of the second lever 8 used to unlock the position of the ball bearing 6 in Embodiment 2. Figure 11 This diagram illustrates the use of the second wrench 8 to unlock and reset the ball bearing 6. Specifically, as shown... Figure 10 and Figure 11As shown, this embodiment includes a second wrench 8, comprising an upper plate 81 and a lower plate 82, each having an operating part and a handle. Several connecting members 83 are provided between the upper plate 81 and the lower plate 82. A second positioning member 85 and a through hole 86 located between the second positioning members 85 are provided on the same side of the operating part of the lower plate 82. A second center ejector 84 is provided on the side of the upper plate 81 opposite the through hole 86. When the second positioning member 85 is inserted into the corresponding tool hole 13, the second center ejector 84 aligns with the top of the push rod 4. Then, the second wrench 8 is pressed down, causing the push rod 4 and the transfer groove 421 to move downwards, and the ball bearing 6 to slide inwards, disengaging the rotating shaft 2 of the long shaft structure from the pulley body 1. After the second wrench 8 is removed, the push rod 4 springs back up, and the ball bearing 6 returns to its original position.

[0043] Example 3 Figure 12 This is an example diagram of the belt drive device proposed in Embodiment 3 of this utility model; Figure 13 for Figure 12 A schematic diagram of the power source 101 and the rotating shaft 2. (See diagram below.) Figure 12 , Figure 13 As shown, the belt drive device of this embodiment includes a power source 101, a belt 102, a drive pulley 103, and several driven pulleys 104. The belt 102 drives and connects the drive pulley 103 and the driven pulleys 104. The drive pulley 103 is configured with the pulley structure proposed in Embodiment 1, but the pulley structure proposed in Embodiment 2 can also be used. The power source 101 has a power output end, which is connected to one end of the rotating shaft 2 and the return spring 5 via a transmission assembly.

[0044] like Figure 13 As shown, the power source 101 in this embodiment is an electric motor. The transmission component between its force output shaft and the rotating shaft 2 can be realized by meshing bevel gear set or universal joint, etc., to adjust the rotational external force output by the electric motor to the direction required by the pulley structure.

[0045] The belt drive device proposed in this embodiment uses the aforementioned belt pulley structure for its drive pulley 103. The power source 101 drives the rotating shaft 2 to rotate. Under normal operating conditions, the balls 6 are confined between the transfer groove 421 on the inner wall of the pulley body 1, the ball rotation space, and the wider section of the outer wall of the rotating shaft 2, achieving a reliable connection between the rotating shaft 2 and the pulley body 1. The ball connection method of the contact surface achieves a flexible connection, eliminating the problem of lack of buffering function in the conventional key and pin rigid connection method. Moreover, by operating the push rod 4, a portion of the balls 6 can be inserted into the second central hole 21 of the rotating shaft 2, achieving separation between the pulley body 1 and the rotating shaft 2.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A pulley structure characterized by comprising: include: The pulley body (1) is provided with a first central hole (11), and the inner wall of the first central hole (11) is provided with two or more grooves (12), and all grooves (12) are parallel to the rotation center line of the pulley body (1). A rotating shaft (2) is provided with a second central hole (21), and a number of first through holes (22) are opened at intervals on the side wall of the rotating shaft (2) facing the groove (12). A rotating shaft sleeve (3) is fitted onto the outside of the rotating shaft (2) and coaxially disposed in the first central hole (11); a number of second through holes (31) corresponding to the position of the first through hole (22) are opened on the side wall of the rotating shaft sleeve (3) to form a number of ball rotation spaces facing the groove (12). The top rod (4) is set in the second central hole (21). The outer wall of the top rod (4) is provided with an inwardly recessed transfer groove (421). The number and distribution of the transfer groove (421) are the same as those of the first through hole (22). The bottom end of the top rod (4) is provided with a return spring (5). Several balls (6) are placed in the ball rotation space, and the positions of the balls (6) on both sides are restricted by the outer walls of the groove (12) and the top rod (4).

2. The pulley structure of claim 1 wherein: The number of first through holes (22) corresponding to each groove (12) is the same and their positions correspond one-to-one.

3. The pulley structure of claim 1 wherein: The top rod (4) is set as a short axis, with the top end not exceeding the first center hole (11) in the use state, and the bottom end connected to the reset spring (5); the lengths of the rotating shaft (2) and the rotating shaft sleeve (3) are both adapted to the length of the top rod (4).

4. The pulley structure of claim 1 wherein: The top rod (4) is set as a long axis, with its top end extending beyond the preset length of the first center hole (11) in the use state, and its bottom end connected to the reset spring (5); the lengths of the rotating shaft (2) and the rotating shaft sleeve (3) are both adapted to the length of the top rod (4).

5. The pulley structure as described in claim 1, characterized in that: The push rod (4) includes a coaxially connected abutment section (41), a transfer section (42), and a connecting section (43). The abutment section (41) is clearance-fitted with the second center hole (21), the transfer section (42) is provided with the transfer groove (421), and the connecting section (43) is located at the bottom end of the push rod (4). The connecting section (43) is fixedly connected to one end of the reset spring (5).

6. The pulley structure of claim 1 wherein: The surfaces of the groove (12) that meet the ball (6) and the surfaces of the transfer groove (421) that meet the ball (6) are both configured as arc-shaped structures.

7. The pulley structure of claim 1 wherein: Tool holes (13) are provided on the end faces of the pulley body (1) and the top of the push rod (4) located on the same side.

8. A belt drive apparatus characterized by: It includes a power source (101), a belt (102), a drive pulley (103) and a driven pulley (104). The belt (102) drives the drive pulley (103) and the driven pulley (104). The drive pulley (103) is configured as a pulley structure according to any one of claims 1-7. The power source (101) is provided with a power output end. The power output end is connected to one end of the rotating shaft (2) and the resetting spring (5) through a transmission component.

9. The belt drive apparatus of claim 8, wherein: The power source (101) is an electric motor, a power output end of the electric motor is arranged as a power output shaft, and a transmission assembly between the power output shaft and the rotating shaft (2) is arranged as a meshing bevel gear set.

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