A pulley expansion device

Abstract

The application discloses a belt pulley expansion device, and belongs to the field of belt pulley and transmission belt assembly tools. The belt pulley expansion device comprises a first expansion block, a second expansion block, a connecting arm and a rotating thrust body, a sliding groove is formed in one end surface of the first expansion block, one end of the connecting arm is fixedly connected with the second expansion block, the other end of the connecting arm is movably arranged in the sliding groove, the rotating thrust body is spirally arranged on the side surface of the first expansion block, the rotating thrust body has a conical surface, and the rotating thrust body is twisted to extend into the first expansion block to generate a thrust force to push the connecting arm to move the second expansion block away from the first expansion block. The belt pulley expansion device has the advantages that the problems that the belt pulley and the transmission belt are not easy to install are solved, and the overall structure is simple and easy to operate.

Description

Technical Field

[0001] This application relates to the field of pulleys and drive belt assembly tools, and more specifically, to a pulley expansion device. Background Technology

[0002] Pulleys and belts are crucial components in mechanical transmission, working in close coordination. Pulleys, as driving or driven wheel-shaped parts, are typically fixed to the shaft of a motor, engine, or equipment. Their outer grooves create a stable meshing relationship with the belt. Belts, made of elastic materials such as rubber or polyurethane, have teeth or planar structures on their surface that match the grooves of the pulleys, effectively transmitting power and reducing slippage during operation. When working together, the rotation of the pulley drives the belt, precisely transmitting power from the power source to the working parts. This combination offers advantages such as smooth transmission, low noise, and convenient installation and maintenance, and is widely used in automotive engines, industrial production lines, agricultural machinery, and medical devices.

[0003] Currently, the installation process of pulleys and belts typically involves first installing two pulleys onto the axle, and then installing the belt onto the pulleys. However, to prevent belt slippage, the belt needs to be taut on the pulleys. Therefore, after one end of the belt is installed onto the pulley, it is difficult to directly install the other end onto the other pulley. In practice, pry bars or manual pulling are often used to force the installation, but this process is time-consuming and laborious, and can damage the belt and pulleys, affecting their service life. Therefore, this application proposes a pulley expansion device to assist in the installation of pulleys and belts. Utility Model Content

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] The purpose of this application is to provide a pulley expansion device to address the shortcomings of the prior art and solve the problem of difficult assembly of belts and pulleys in the prior art.

[0006] To achieve the above objectives, this application provides the following technical solution: A pulley expansion device includes a first expansion block, a second expansion block, a connecting arm, and a rotating thrust body. A groove is formed on one end face of the first expansion block. One end of the connecting arm is fixedly connected to the second expansion block, and the other end of the connecting arm is movably inserted into the groove. A rotating thrust body is spirally assembled on the side of the first expansion block. The rotating thrust body has a conical surface. Twisting the rotating thrust body extends into the first expansion block and generates thrust, forcing the connecting arm to push the second expansion block away from the first expansion block.

[0007] Furthermore, both the first expansion block and the second expansion block have an adapter groove on their opposite ends, which are arc-shaped grooves.

[0008] Furthermore, the corners at the connection points between the end faces of the second and first expansion blocks and the adapter grooves are respectively set as rounded chamfers.

[0009] Furthermore, a first threaded hole is provided on the side wall of the first expansion block, and the rotating thrust body is a stud threaded into the first threaded hole. The end of the stud facing the outside of the first expansion block is provided with an internal hexagonal end block, and the end of the stud facing the inside of the first expansion block is provided with a cone, which extends into the sliding groove.

[0010] Furthermore, a front rod is connected to the front end of the cone.

[0011] Furthermore, a support hole is provided on the inner sidewall of the chute to cooperate with the front end rod. The front end rod is rotatably supported in the support hole to limit the axial and radial swing of the rotating thrust body.

[0012] Furthermore, a second threaded hole is provided on the side wall of the first expansion block, and a limiting bolt is threaded into the second threaded hole. A guide groove is provided on the connecting arm, and the limiting bolt is inserted into the guide groove, and the limiting bolt can move relative to the connecting arm along the guide groove.

[0013] Furthermore, the limiting bolt is an internal hexagon bolt, and the end cap of the limiting bolt is embedded in the side wall of the first expansion block.

[0014] Furthermore, the peripheral sidewall of the connecting arm slides against the inner wall of the groove, and the peripheral edge of the end of the connecting arm that extends into the groove is set as a rounded chamfer.

[0015] The beneficial effects of this application are as follows: By setting up a rotating thrust body, and with the sliding fit between the connecting arm and the slide groove, after the rotating thrust body is turned, the conical inclined surface on the cone in the rotating thrust body can force the second expansion block and the first expansion block to move away from each other. The second expansion block and the first expansion block can then expand the two pulleys, making the transmission belt taut. The auxiliary belt and the transmission belt are then installed. Compared with the traditional method of installing the transmission belt onto the pulley by means of pliers, pry bars, or pulling by hand, this method effectively avoids damage to the pulleys and the transmission belt, solves the problem of the pulleys and transmission belts being difficult to install, and has a simple overall structure that is easy to operate. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0017] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a structural diagram showing the disassembled first and second expansion blocks of this application; Figure 3 This is a schematic diagram of the structure of the rotating thrust body and the limiting bolt separated from the first expansion block in this application; Figure 4 This is a schematic diagram of the rotating thrust body of this application; Figure 5 This is a schematic diagram of the structure of the pulley and drive belt assembly applied in this application.

[0019] 1. First expansion block; 2. Second expansion block; 3. Connecting arm; 4. Adaptor groove; 5. Rotating thrust body; 6. Limiting bolt; 7. Guide groove; 8. Slide groove; 9. First threaded hole; 10. Second threaded hole; 11. Stud; 12. Hexagonal socket end block; 13. Cone; 14. Front end rod; 15. Pulley; 16. Drive belt. Detailed Implementation

[0020] The pulley expansion device provided in this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can also use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit this application.

[0021] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0022] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0023] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Reference Figure 1-5As shown, this utility model provides a pulley expansion device for assisting in the assembly of a pulley 15 and a transmission belt 16. The pulley expansion device includes a first expansion block 1, a second expansion block 2, a connecting arm 3, and a rotating thrust body 5. A groove 8 is formed on one end face of the first expansion block 1. One end of the connecting arm 3 is fixedly connected to the second expansion block 2, and the other end of the connecting arm 3 movably passes through the groove 8. The rotating thrust body 5 is spirally assembled on the side of the first expansion block 1. The rotating thrust body 5 has a conical surface. Twisting the rotating thrust body... The rotating thrust body 5 extends into the first expansion block 1, generating a thrust that forces the connecting arm 3 to push the second expansion block 2 away from the first expansion block 1. In this embodiment, the first expansion block 1 has a first threaded hole 9 on its side wall. The rotating thrust body 5 is a stud 11 threaded into the first threaded hole 9. The stud 11 has an internal hexagonal end block 12 at one end facing the outside of the first expansion block 1, and a cone 13 at the other end facing the inside of the first expansion block 1. The cone 13 extends into the sliding groove 8, and a front end rod 14 is connected to the front end rod 14. A support hole (not shown in the figure) is provided on the inner side wall of the sliding groove 8 to cooperate with the front end rod 14. The front end rod 14 slides in cooperation with the support hole. Its function is as follows: when the stud 11 is rotated by turning the internal hexagonal end block 12, the front rod 14 rotates and is supported in the support hole, thereby effectively limiting the axial and radial swing of the rotating thrust body 5, ensuring that the conical surface of the cone 13 can smoothly push the connecting arm 3, making the thrust transmission more stable and reliable, and reducing abnormal wear between components. Furthermore, in use, the first expansion block 1 and the second expansion block 2 are placed between the two pulleys 15 fitted with the transmission belt 16. Using a hexagonal wrench adapted to the internal hexagonal end block 12, the stud 11 is turned to rotate. The stud 11 pushes the cone 13 deeper into the slide groove 8. The conical inclined surface on the cone 13 pushes the connecting arm 3 to move horizontally in the slide groove 8, forcing the second expansion block 2 and the first expansion block 1 to move away from each other. Thus, the first expansion block 1 and the second expansion block 2 expand the two pulleys 15, and the two pulleys 15 tension the transmission belt 16.

[0025] Furthermore, in this embodiment, the end faces of the first expansion block 1 and the second expansion block 2 that are far apart from each other are each provided with an adapter groove 4. The adapter groove 4 is a circular arc groove, which is used to adapt to the wheel surface of the pulley 15 to avoid slippage between the first expansion block 1 and the second expansion block 2 and the pulley 15 when expanding. The corners at the connection between the end faces of the second expansion block 2 and the first expansion block 1 and the adapter groove 4 are set as circular arc chamfers to avoid scratching the pulley 15.

[0026] In a further embodiment, a second threaded hole 10 is also provided on the side wall of the first expansion block 1, and a limiting bolt 6 is threaded into the second threaded hole 10. A guide groove 7 is provided on the connecting arm 3, and the limiting bolt 6 is inserted into the guide groove 7, and the limiting bolt 6 can move relative to the connecting arm 3 along the guide groove 7. The limiting bolt 6 is an internal hex bolt, and the end cap of the limiting bolt 6 is embedded in the side wall of the first expansion block 1. The limiting bolt 6 cooperates with the guide groove 7 to limit the connecting arm 3 and prevent the connecting arm 3 from disengaging from the slide groove 8. After the limiting bolt 6 is removed, the connecting arm 3 can be pulled out of the slide groove 8, so that the first expansion block 1 and the second expansion block 2 are separated. The peripheral side wall of the connecting arm 3 slides and fits against the inner wall of the slide groove 8. The peripheral edge of the end of the connecting arm 3 that extends into the slide groove 8 is set as a rounded chamfer. This rounded chamfer facilitates the cone 13 to push the connecting arm 3 to move.

[0027] Working principle: When assembling pulley 15 and drive belt 16, this pulley expansion device first mounts the drive belt 16 onto the two pulleys 15. Then, one of the pulleys 15 is installed at the work station. Next, the first expansion block 1 and the second expansion block 2 are placed between the two pulleys 15. Using a hex wrench and the internal hexagonal end block 12, the stud 11 is turned. The stud 11 pushes the cone 13 deeper into the slide groove 8. The conical inclined surface on the cone 13 pushes the connecting arm 3 to move horizontally within the slide groove 8, forcing the second expansion block 2 and the first expansion block 1 to move away from each other. In addition, the matching groove 4 on the end face of the first expansion block 1 and the second expansion block 2 moving away from each other connects with the pulley 15. The first expansion block 1 and the second expansion block 2 can expand the two pulleys 15, and the two pulleys 15 can tension the transmission belt 16. Then, the remaining pulley 15 can be installed on the corresponding work station. Compared with the traditional method of first installing the pulley 15 and then installing the transmission belt 16 onto the pulley 15 by means of pliers, pry bar, or pulling by hand, this method effectively avoids damage to the pulley 15 and the transmission belt 16. After the pulley 15 and the transmission belt 16 are assembled, the stud 11 is turned in the opposite direction to bring the second expansion block 2 and the first expansion block 1 closer together. The second expansion block 2 and the first expansion block 1 can then be removed between the two pulleys 15. The overall structure is simple and easy to operate.

[0028] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

[0029] It should be noted that this application covers any alternatives, modifications, equivalent methods, and solutions made within the spirit and scope of this application. To provide the public with a thorough understanding of this application, specific details are described in detail in the preferred embodiments, while those skilled in the art can fully understand this application without these details. Furthermore, to avoid unnecessary confusion regarding the substance of this application, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0030] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A pulley expansion device, comprising a first expansion block (1), a second expansion block (2), a connecting arm (3), and a rotating thrust body (5), characterized in that: The first expansion block (1) has a groove (8) on one end face. One end of the connecting arm (3) is fixedly connected to the second expansion block (2). The other end of the connecting arm (3) is movably inserted into the groove (8). The first expansion block (1) is spirally fitted with a rotating thrust body (5) on its side. The rotating thrust body (5) has a conical surface. Twisting the rotating thrust body (5) extends into the first expansion block (1) and generates thrust, forcing the connecting arm (3) to push the second expansion block (2) away from the first expansion block (1).

2. The pulley expansion device according to claim 1, characterized in that: The first expansion block (1) and the second expansion block (2) each have an adapter groove (4) on their opposite ends, which are far apart from each other. The adapter groove (4) is an arc groove.

3. The pulley expansion device according to claim 1, characterized in that: The corners at the junctions of the end faces of the second expansion block (2) and the first expansion block (1) with the adapter groove (4) are set as rounded chamfers.

4. The pulley expansion device according to claim 1, characterized in that: The first expansion block (1) has a first threaded hole (9) on its side wall. The rotating thrust body (5) is a stud (11) threaded into the first threaded hole (9). The stud (11) has an internal hexagonal end block (12) at one end facing the outside of the first expansion block (1), and a cone (13) at one end facing the inside of the first expansion block (1). The cone (13) extends into the groove (8).

5. The pulley expansion device according to claim 4, characterized in that: The front end of the cone (13) is coaxially connected to a front end rod (14).

6. The pulley expansion device according to claim 5, characterized in that: The inner wall of the slide (8) is provided with a support hole that cooperates with the front end rod (14), and the front end rod (14) is rotatably supported in the support hole.

7. The pulley expansion device according to claim 1, characterized in that: The first expansion block (1) is also provided with a second threaded hole (10) on its side wall. A limiting bolt (6) is threaded into the second threaded hole (10). A guide groove (7) is provided on the connecting arm (3). The limiting bolt (6) is inserted into the guide groove (7) and can move relative to the connecting arm (3) along the guide groove (7).

8. The pulley expansion device according to claim 7, characterized in that: The limiting bolt (6) is an internal hex bolt, and the end cap of the limiting bolt (6) is embedded in the side wall of the first expansion block (1).

9. The pulley expansion device according to claim 1, characterized in that: The peripheral sidewall of the connecting arm (3) slides against the inner wall of the slide groove (8), and the peripheral edge of the end of the connecting arm (3) that extends into the slide groove (8) is set as a rounded chamfer.

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