A synchronous belt drive structure for hobbing

Abstract

This invention belongs to the field of machine tool processing and relates to a synchronous belt drive structure for gear hobbing. The structure mainly includes a machine bed, a drum, a reducer, pulleys, and an open-end synchronous belt. The drum is flexibly mounted on the machine bed via bearings, and its end face is equipped with interchangeable first and second worktables. The reducer drives the pulleys, and power is transmitted between the pulleys and the drum via the open-end synchronous belt. This design facilitates installation and adjustment. This invention utilizes an open-end synchronous belt to improve flexibility; the toothed outer circumference of the pulleys and the smooth, toothless outer circumference of the drum simplify the structure and reduce costs; a precise limiting device ensures accurate positioning during the 180-degree reciprocating rotation of the drum, enabling efficient worktable exchange; and optimized transmission structure and materials enhance load-bearing capacity and stability, extending service life.

Description

Technical Field

[0001] This invention belongs to the field of machine tool processing and relates to a synchronous belt drive structure for gear hobbing. Background Technology

[0002] In the field of mechanical manufacturing and machining, especially in gear hobbing, the precision and reliability of the transmission system are crucial for ensuring machining quality and improving production efficiency. For transmissions with a large center distance between the two drive shafts, synchronous belt drives are typically used. Traditional synchronous belt drive structures, as key components for power transmission and motion control, usually employ a closed annular synchronous belt coupled with two toothed synchronous pulleys. While this structure meets transmission requirements to a certain extent, its limitations are becoming increasingly apparent for some new mechanical structures due to continuous advancements in machining technology and ever-increasing precision requirements.

[0003] First, enclosed, ring-shaped synchronous belts present significant inconveniences in terms of installation and maintenance. Due to their enclosed structure, installing or replacing the synchronous belt requires considerable operating space, and the process is complex and time-consuming. Once the synchronous belt is damaged, it often needs to be replaced entirely, which not only increases maintenance costs but also affects production schedules.

[0004] Secondly, traditional synchronous belt drive structures struggle to achieve efficient and precise reciprocating rotation when used in applications requiring table exchanges. This is particularly true in gear hobbing on dual-table hobbing machines, where the two tables must work alternately to achieve continuous workpiece processing and high-efficiency output. However, due to limitations of traditional structures, precise 180-degree reciprocating rotation is often impossible, leading to inaccurate table exchanges and impacting processing accuracy and efficiency. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a synchronous belt drive structure for gear hobbing, thereby solving the existing problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a synchronous belt drive structure for gear hobbing, comprising a bed, a drum mounted on the bed via bearings, and a reducer mounted on the bed via a connecting plate and a mounting bracket. A pulley is mounted on the output end of the reducer, and a first worktable and a second worktable are mounted on the end face of the drum via screws. The bed also has two oblique holes, and the pulley and the drum are connected by an open synchronous belt passing through the oblique holes. A stop block is also mounted on the drum, and limiting shafts that engage with the stop blocks are respectively provided on the bed at the upper and lower relative positions of the drum.

[0007] Optionally, the outer circle of the pulley has a toothed structure, while the outer circle of the drum has a smooth, toothless structure.

[0008] Optionally, the two ends of the opening of the timing belt are fixed to the drum by fixing components.

[0009] Optionally, the fixing components include a mounting block that is screwed onto the drum, a pad that is mounted on the mounting block, and a pressure block that presses the open timing belt together with the pad, the mounting block and the drum by screws.

[0010] Optionally, the upper surface of the pad is configured with a toothed structure.

[0011] Optionally, the outer ring of the bearing is fixed to the bed by screws, and the inner ring of the rotating part of the bearing is fixed to the drum by screws.

[0012] Optionally, a servo motor can be connected to the input of the speed reducer.

[0013] Optionally, two blocks are provided, which are respectively positioned opposite each other on the top two sides of the drum.

[0014] The beneficial effects of this invention are as follows:

[0015] 1) This invention uses an open synchronous belt to replace the traditional closed ring synchronous belt. This design not only facilitates the installation, replacement and adjustment of the synchronous belt, but also makes the synchronous belt more flexible in the transmission process and able to adapt to more complex motion trajectories and load changes.

[0016] 2) This invention employs a special design where only one pulley has teeth on its outer circumference, while the outer circumference of the drum is smooth and toothless. This design simplifies the transmission structure, reduces manufacturing costs, and simultaneously improves the accuracy and stability of the transmission.

[0017] 3) To achieve precise 180-degree reciprocating rotation of the drum, this invention designs a precise limiting device. Through the stop blocks installed on the drum and the limiting shafts on the bed, the drum can be precisely limited during rotation, thereby achieving efficient and precise exchange of worktables;

[0018] 4) By optimizing the transmission structure and material selection, this invention improves the load-bearing capacity and stability of the synchronous belt drive structure; even when running for a long time or bearing a large load, it can maintain the accuracy and reliability of the transmission and extend the service life of the equipment.

[0019] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is an overall front view of a synchronous belt drive structure for gear hobbing according to the present invention;

[0022] Figure 2 This is an overall top view of a synchronous belt drive structure for gear hobbing according to the present invention;

[0023] Figure 3 This is a schematic diagram showing the engagement of a stop and a limiting shaft in a synchronous belt drive structure for gear hobbing according to the present invention.

[0024] Figure 4 This is a schematic diagram of the worktable installation for a synchronous belt drive structure for gear hobbing according to the present invention.

[0025] Figure 5 This is a top view of the worktable after installation of the synchronous belt drive structure for gear hobbing according to the present invention.

[0026] Reference numerals in the attached drawings: 1. Bed; 2. Mounting frame; 3. Pulley; 4. Open timing belt; 5. Drum; 6. Mounting block; 7. Pad; 8. Pressure block; 9. Servo motor; 10. Reducer; 11. Connecting plate; 12. Bearing; 13. Stop block; 14. Limiting shaft; 15. First worktable; 16. Second worktable. Detailed Implementation

[0027] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Please see Figures 1-5 This is a synchronous belt drive structure for gear hobbing, comprising a bed 1, a drum 5 mounted on the bed 1 via bearings 12, and a reducer 10 mounted on the bed 1 via a connecting plate 11 and a mounting bracket 2. A pulley 3 is mounted on the output end of the reducer 10. A first worktable 15 and a second worktable 16 are mounted on the end face of the drum 5 via screws. The bed 1 also has two oblique holes, and the pulley 3 and the drum 5 are connected by an open synchronous belt 4 passing through the oblique holes. A stop block 13 is also mounted on the drum 5. Limiting shafts 14 are respectively provided on the bed 1 at opposite upper and lower positions of the drum 5 to engage with the stop blocks 13. The outer circumference of the pulley 3 has a toothed structure. The outer circumference of the drum 5 is smooth and toothless. The two ends of the opening of the open timing belt 4 are fixed to the drum 5 by fixing components. The fixing components include mounting blocks 6 installed on the drum 5 by screws, pads 7 installed on the mounting blocks 6, and pressure blocks 8 that press the open timing belt 4 together with the pads 7, mounting blocks 6 and the drum 5 by screws. The upper surface of the pads 7 is set with a toothed structure. The outer ring of the bearing 12 is fixed to the bed 1 by screws, and the inner ring of the rotating part of the bearing 12 is fixed to the drum 5 by screws. The input end of the reducer 10 is connected to a servo motor 9. Two stops 13 are provided, which are respectively arranged opposite each other on the top two sides of the drum 5.

[0031] Before processing begins, the first worktable 15 and the second worktable 16 are respectively installed on the two end faces of the drum 5. The drum 5 is in its initial position, typically with one worktable (e.g., the first worktable 15) facing the processing area, while the other worktable (e.g., the second worktable 16) is in the non-processing area. When it is necessary to exchange worktables, the servo motor 9 starts to rotate according to the control signal. The rotation direction of the servo motor 9 depends on which worktable needs to be exchanged to. The rotation of the servo motor 9 is reduced in speed and increased in torque by the reducer 10, and then transmitted to the toothed pulley 3. The rotation of the toothed pulley 3 drives the open timing belt 4 to move. One end of the open timing belt 4 is tightly engaged with the toothed pulley 3, and the other end is firmly pressed onto the drum 5 by the fixing action of the mounting block 6, the pad block 7, and the pressure block 8. As the open timing belt 4 moves, the drum 5 begins to rotate.

[0032] Driven by the open-ended synchronous belt 4, the drum 5 reciprocates 180 degrees. This rotation is precisely controlled by the servo motor 9, ensuring accuracy and stability. During the rotation of the drum 5, the stop block 13 mounted on the drum 5 contacts and is restricted by the limit shaft 14 on the bed 1. This limiting device ensures that the drum 5 stops accurately when it reaches the predetermined position, thus achieving precise table exchange. When the drum 5 rotates to the 180-degree position, the table that was originally facing the processing area (e.g., the first table 15) will return to the non-processing area, while another table (e.g., the second table 16) will face the processing area. This completes the table exchange process.

[0033] After completing one worktable exchange, the processing equipment can continue processing the next workpiece. When another worktable exchange is needed, simply repeat the above process. Through the precise control of the servo motor 9 and the stability of the synchronous belt drive structure, each worktable exchange can be performed accurately, thereby improving processing efficiency and precision.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A synchronous belt drive structure for gear hobbing, characterized by: It includes a bed, a drum mounted on the bed via bearings, and a reducer mounted on the bed via a mounting plate and a mounting bracket. The output end of the reducer is equipped with a pulley, and the end face of the drum is equipped with a first worktable and a second worktable via screws. The bed is also provided with two oblique holes, and the pulley and the drum are connected by a synchronous belt passing through the opening of the oblique holes; the drum is also equipped with a stop block, and the bed is provided with limiting shafts that engage with the stop block at the upper and lower relative positions of the drum; The outer circle of the pulley has a toothed structure, while the outer circle of the drum has a smooth, toothless structure. The two ends of the opening of the open timing belt are fixed to the drum by fixing components. The fixing components include a mounting block that is mounted on the drum by screws, a pad that is mounted on the mounting block, and a pressure block that presses the open timing belt together with the pad, the mounting block, and the drum by screws. The upper surface of the pad is set to have a toothed structure.

2. The synchronous belt drive structure for gear hobbing according to claim 1, characterized in that: The outer ring of the bearing is fixed to the bed with screws, and the inner ring of the rotating part of the bearing is fixed to the drum with screws.

3. The synchronous belt drive structure for gear hobbing according to claim 1, characterized in that: A servo motor is connected to the input end of the speed reducer.

4. The synchronous belt drive structure for gear hobbing according to claim 1, characterized in that: There are two blocks, which are respectively set on the top two sides of the drum.

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