A synchronous wheel structure

Abstract

The application discloses a synchronous wheel structure for reducing the friction between a synchronous belt and a rim. The application comprises a pulley body, a circular ring rim and a threaded fastener, wherein the pulley body is provided with uniformly distributed teeth; the circular ring rim is located at the axial ends of the pulley body, and the circular ring rim is connected with the pulley body through the threaded fastener; an inner circle chamfer is arranged on the inner circle of the circular ring rim, the inner circle chamfer is located in the overlapping area between the circular ring rim and the pulley body and is close to one side of the pulley body, in the locked state of the threaded fastener, the inner circle of the circular ring rim is pressed and fitted to the pulley body, and the outer circle of the circular ring rim is away from the pulley body.

Description

Technical Field

[0001] This application relates to the field of mechanical transmission technology, and in particular to a synchronous pulley structure. Background Technology

[0002] Traditional synchronous pulleys feature a large chamfered flange design, forming a V-shaped opening, with the flanges wider at the top and narrower at the bottom. This design not only allows the synchronous belt to smoothly fall between the flanges but also ensures that the belt is securely held between them during transmission, effectively preventing radial slippage and ensuring the accuracy and stability of the transmission.

[0003] However, for larger, thin-type synchronous pulleys, the larger diameter of the retaining ring and the thinner edge prevent the creation of large chamfers. Insufficient chamfering results in the edge being nearly perpendicular to the teeth, causing friction between the synchronous belt and the edge during pulley rotation. This leads to abnormal noise, accelerates belt wear, and shortens belt lifespan. Furthermore, the wear debris generated during friction enters the transmission system of the synchronous pulley and belt, further exacerbating component wear, reducing transmission accuracy, and potentially causing equipment malfunctions, impacting the overall performance and reliability of the machinery. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a synchronous pulley structure to reduce friction between the synchronous belt and the flange, thereby reducing the generation of wear debris.

[0005] The technical solution provided in this application is described below:

[0006] This application provides a synchronous wheel structure, including:

[0007] The pulley body comprises a pulley body, a circular retaining edge, and threaded fasteners. The pulley body has evenly distributed teeth. The circular retaining edge is located at both ends of the pulley body along its axial direction and is connected to the pulley body via the threaded fasteners. The inner ring of the circular retaining edge has an inner chamfer located in the overlapping area between the circular retaining edge and the pulley body, and is close to the pulley body. When the threaded fasteners are tightened, the inner ring of the circular retaining edge is pressed against the pulley body, while the outer ring of the circular retaining edge is away from the pulley body.

[0008] Optionally, the outer ring of the circular retaining edge is provided with an outer ring chamfer, and the outer ring chamfer is located on the side of the circular retaining edge close to the pulley body.

[0009] Optionally, the bevel angle of the outer ring chamfer is greater than the bevel angle of the inner ring chamfer.

[0010] Optionally, the inner ring of the circular retaining edge is provided with a connecting part, and the threaded fastener passes through the connecting part and connects to the pulley body.

[0011] Optionally, both ends of the pulley body are provided with outwardly extending bosses, and the annular retaining edge is sleeved on the outside of the bosses.

[0012] Optionally, the extension length of the boss is less than the thickness of the annular retaining edge, the threaded fastener is connected to the boss, and the edge of the threaded fastener abuts against the inner ring of the annular retaining edge.

[0013] Optionally, the boss is provided with at least 6 connecting holes, which are used to cooperate with the threaded fastener to fix the annular retaining edge on the pulley body.

[0014] Optionally, a shaft hole is provided at the center of the pulley body, penetrating the pulley body and the boss.

[0015] Optionally, the threaded fastener is one of bolts, screws, or screws.

[0016] Optionally, the thickness of the annular retaining edge is 1-1.5mm.

[0017] As can be seen from the above technical solutions, this application has the following beneficial effects:

[0018] By setting circular retaining rings at both ends of the pulley body, and fixing the retaining rings to the pulley body with threaded fasteners, an inner chamfer is provided on the inner ring of the retaining ring. The inner chamfer is located in the overlapping area of ​​the retaining ring and the pulley body, close to the pulley body. When the threaded fasteners are tightened, the inner chamfer is in contact with the pulley body, and the outer ring of the retaining ring is away from the pulley body. Therefore, under the action of the threaded fasteners, the retaining ring is no longer perpendicular to the axis of the pulley body, and the outer ring of the retaining ring moves outward away from the pulley body. This reduces the contact between the timing belt and the retaining ring during operation, thus reducing friction between the timing belt and the retaining ring and reducing the generation of wear debris. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an undeformed annular retaining edge in a synchronous gear connection according to this application;

[0020] Figure 2 This is a schematic diagram of the deformed annular retaining edge in a synchronous pulley structure according to this application;

[0021] Figure 3 This is an overall schematic diagram of a synchronous pulley structure according to this application;

[0022] Figure 4This is a schematic diagram of the pulley body in a synchronous pulley structure according to this application;

[0023] Figure 5 This is a schematic cross-sectional view of the circular retaining edge in a synchronous pulley structure according to this application;

[0024] Figure 6 This is a schematic diagram of the connecting part in a synchronous pulley structure according to this application;

[0025] In the figure, the pulley body is 01, the circular ring flange is 02, the threaded fastener is 03, the inner ring chamfer is 04, the outer ring chamfer is 05, the connecting part is 06, the boss is 07, and the shaft hole is 08. Detailed Implementation

[0026] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0027] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0028] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0029] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application 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 conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0030] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In this application, addressing the issue that the thin flange of traditional large-sized thin synchronous pulleys prevents the creation of large chamfers, leading to friction between the synchronous belt and the flange, this application proposes a synchronous pulley structure that reduces friction between the synchronous belt and the flange, thereby reducing the generation of wear debris. The specific description is as follows:

[0032] See Figures 1 to 6 The synchronous wheel structure provided in this application includes:

[0033] The pulley body 01, the annular retaining edge 02, and the threaded fastener 03 are provided. The pulley body 01 is provided with evenly distributed gear teeth. The annular retaining edge 02 is located at both ends of the pulley body 01 in the axial direction and is connected to the pulley body 01 by the threaded fastener 03. The inner ring of the annular retaining edge 02 is provided with an inner ring chamfer 04. The inner ring chamfer 04 is located in the overlapping area between the annular retaining edge 02 and the pulley body 01 and is close to the side of the pulley body 01. When the threaded fastener 03 is locked, the inner ring of the annular retaining edge 02 is pressed against the pulley body 01, and the outer ring of the annular retaining edge 02 is away from the pulley body 01.

[0034] The pulley body 01 has a disc-shaped or cylindrical structure. A shaft hole 08 for mounting a shaft is located at the center of the pulley body 01, enabling positioning and rotation on the equipment. Evenly distributed teeth are arranged on the outer circumference of the pulley body 01. These teeth mesh with the teeth on the synchronous belt to transmit power. The shape and size of the teeth are designed according to the specifications of the synchronous belt and the transmission requirements to ensure good meshing performance.

[0035] The pulley body 01 is made of high-strength, wear-resistant metal materials, such as alloy steel or aluminum alloy.

[0036] Circular retaining flanges 02 are located at both ends of the pulley body 01 along the axial direction, one at each end. The function of the circular retaining flanges 02 is to restrict the movement of the timing belt in the axial direction and prevent the timing belt from detaching from the pulley body 01 during operation. The circular retaining flanges 02 have a circular ring structure, and the inner diameter of the circular retaining flanges 02 is smaller than the outer diameter of the pulley body 01, so that the circular retaining flanges 02 can be fixed to the ends of the pulley body 01 by threaded fasteners 03.

[0037] The inner ring of the circular retaining edge 02 is provided with an inner ring chamfer 04, which is located in the overlapping area between the circular retaining edge 02 and the pulley body 01. The inner ring chamfer 04 is located on the side of the circular retaining edge 02 closest to the pulley body 01. When the end of the circular retaining edge 02 is in contact with the pulley body 01, there is a gap between the inner ring chamfer 04 and the pulley body 01. During the tightening of the threaded fastener 03, the threaded fastener 03 presses the inner ring of the circular retaining edge 02 from the outside to the inside (towards the pulley body 01). The inner ring is pressed and moves towards the pulley body 01, thereby gradually reducing the gap. During the pressing process, the circular retaining edge 02 deforms. With the end of the inner ring chamfer 04 (the position where the inner ring chamfer 04 connects with the side of the circular retaining edge 02) as the fulcrum, the inner ring moves towards the pulley body 01, and the outer ring curls outward (moves away from the pulley body 01).

[0038] In this embodiment, the inner ring (with chamfered side) of the circular retaining edge 02 is pressed against the pulley body 01, while the outer ring (with the side in contact with the synchronous belt) is slightly raised outward due to the leverage effect. As a result, the entire circular retaining edge 02 no longer remains vertical, but forms a slightly continuous, outwardly flared "trumpet mouth" facing the tooth surface of the synchronous belt.

[0039] In this embodiment, circular retaining edges 02 are respectively provided at both ends of the pulley body 01. The circular retaining edges 02 are fixed to the pulley body 01 by threaded fasteners 03. An inner chamfer 04 is provided on the inner ring of the circular retaining edge 02. The inner chamfer 04 is located in the overlapping area of ​​the circular retaining edge 02 and the pulley body 01 and is close to the side of the pulley body 01. When the threaded fasteners 03 are locked, the inner chamfer 04 is in contact with the pulley body 01, and the outer ring of the circular retaining edge 02 is away from the pulley body 01. Therefore, under the action of the threaded fasteners 03, the circular retaining edge 02 is no longer perpendicular to the axis of the pulley body 01, and the outer ring of the circular retaining edge 02 moves outward away from the pulley body 01. This reduces the contact between the synchronous belt and the circular retaining edge 02 during operation, thereby reducing the friction between the synchronous belt and the retaining edge and reducing the generation of wear debris.

[0040] Please continue reading. Figure 2 In one optional embodiment, the outer ring of the circular retaining edge 02 is provided with an outer ring chamfer 05, which is located on the side of the circular retaining edge 02 closest to the pulley body 01. Both the outer ring chamfer 05 and the inner ring chamfer 04 are located on the side of the circular retaining edge 02 facing the pulley body 01. By providing the outer ring chamfer 05, when the outer ring of the circular retaining edge 02 curves outward, the inner side of the circular retaining edge 02 is smoother, and the distance between the outer rings of the two ends of the circular retaining edge 02 is greater, increasing the restraint range on the timing belt and further limiting the possibility of the timing belt slipping off.

[0041] Please continue reading. Figure 5In this optional embodiment, the bevel angle of the outer chamfer 05 is greater than that of the inner chamfer 04. A larger bevel angle results in a steeper cut; therefore, the outer chamfer 04 is steeper than the inner chamfer 05. In this embodiment, the inner chamfer 04 and the outer chamfer 05 can be set according to the thickness of the circular flange 02. For example, when the thickness of the circular flange 02 is 1mm, the inner chamfer 04 can be a chamfer of 0.5mm height with an angle of 15° to 75°, and the outer chamfer 05 can be a chamfer of 0.8 to 0.95mm within the same angle range.

[0042] Please continue reading. Figure 6 In one optional embodiment, the inner ring of the circular flange 02 is provided with a connecting portion 06, and a threaded fastener 03 passes through the connecting portion 06 and connects to the pulley body 01. The connecting portion 06 is circular in shape and is integrally formed with the circular flange 02. The connecting portion 06 extends inward from the inner ring of the circular flange 02 (in the direction of the center of the circular flange 02).

[0043] In this embodiment, the connecting part 06 is provided with a through hole. The diameter of the through hole is larger than the outer diameter of the threaded fastener 03 so that the threaded fastener 03 can pass through the connecting part 06. It should be noted that since the inner ring of the annular retaining edge 02 will fit against the pulley body 01 when the threaded fastener 03 is locked, the diameter of the through hole needs to be set to be larger or longer to ensure that the through hole can move when the inner ring is deformed and is not restricted by the threaded fastener 03.

[0044] In an optional embodiment, both ends of the pulley body 01 are provided with outwardly extending bosses 07, and the circular flange 02 is sleeved on the bosses 07.

[0045] The boss 07 is a circular boss 07, which is coaxial with the pulley body 01. The outer diameter of the boss 07 is smaller than the outer diameter of the pulley body 01. The function of the boss 07 is to hold the circular retaining edge 02, so that the circular retaining edge 02 is coaxial with the pulley body 01. Since the circular retaining edge 02 is sleeved on the outside of the boss 07, the circular retaining edge 02 does not undergo radial displacement relative to the pulley body 01 during the rotation of the pulley body 01.

[0046] In this optional embodiment, the extension length of the boss 07 is less than the thickness of the annular retaining edge 02, and the threaded fastener 03 is connected to the boss 07, with the edge of the threaded fastener 03 abutting against the inner ring of the annular retaining edge 02.

[0047] The boss 07 extends outward from the end of the pulley body 01 (extending outward along the axis of the pulley body 01). The extension length of the boss 07 must be less than the thickness of the circular retaining edge 02, so as to ensure that during the locking process of the threaded fastener 03, the threaded fastener 03 can generate a force that pushes the inner ring of the circular retaining edge 02 inward.

[0048] Threaded fasteners 03 are distributed on the edge of the boss 07, ensuring that when the threaded fasteners 03 are screwed into the boss 07 in a direction parallel to the axis of the pulley body 01, the edge of the threaded fasteners 03 can cover and compress the inner ring of the annular retaining edge 02. The threaded fasteners 03 include an insert end and a compressing end connected to each other. The outer diameter of the compressing end is larger than the outer diameter of the insert end. The insert end is used to pass through the boss 07, and the compressing end is used to cover the edge of the inner ring and compress the edge of the inner ring (in the locked state).

[0049] In this optional embodiment, the boss 07 is provided with at least 6 connecting holes, which are used to cooperate with the threaded fastener 03 to fix the annular retaining edge 02 to the pulley body 01.

[0050] This application is applied to a thin synchronous pulley of a larger size. Therefore, at least 6 connecting holes are provided on the boss 07 to ensure that the circular retaining edge 02 is fixed to the end of the pulley body 01. Each connecting hole is engaged with a threaded fastener 03. The connecting holes are evenly distributed on the edge of the boss 07. The number of connecting holes can be 6, 8, 10, etc., and the specific number is not limited here.

[0051] In addition, the connecting hole can simultaneously penetrate the bosses 07 at both ends of the pulley body 01.

[0052] In an optional embodiment, a shaft hole 08 is provided at the center of the pulley body 01, which passes through the pulley body 01 and the boss 07.

[0053] In an optional embodiment, the threaded fastener 03 is one of a bolt, screw, or bolt. Taking a bolt as an example, the edge of the bolt nut can cover the inner ring of the circular retaining edge 02.

[0054] In one optional embodiment, the thickness of the circular retaining edge 02 is 1-1.5mm. In this embodiment, the thickness of the circular retaining edge 02 is set to 1-1.5mm, which facilitates the making of small chamfers and also facilitates the inner ring to deform under pressure and the outer ring to warp outward.

Claims

1. A synchronous wheel structure, characterized by, include: The pulley body, the circular retaining edge, and the threaded fasteners, wherein the pulley body is provided with evenly distributed teeth; The circular retaining edge is located at both ends of the pulley body along the axial direction, and the circular retaining edge is connected to the pulley body by the threaded fastener; The inner ring of the circular retaining edge is provided with an inner ring chamfer. The inner ring chamfer is located in the overlapping area between the circular retaining edge and the pulley body and is close to the side of the pulley body. When the threaded fastener is locked, the inner ring of the circular retaining edge is pressed against the pulley body, and the outer ring of the circular retaining edge is away from the pulley body.

2. The synchronous pulley structure according to claim 1, characterized in that, The outer ring of the circular retaining edge is provided with an outer ring chamfer, which is located on the side of the circular retaining edge closest to the pulley body.

3. The synchronous pulley structure according to claim 2, characterized in that, The bevel angle of the outer chamfer is greater than that of the inner chamfer.

4. The synchronous pulley structure according to any one of claims 1 to 3, characterized in that, The inner ring of the circular retaining edge is provided with a connecting part, and the threaded fastener passes through the connecting part and connects to the pulley body.

5. The synchronous pulley structure according to any one of claims 1 to 3, characterized in that, Both ends of the pulley body are provided with outwardly extending bosses, and the circular retaining edge is sleeved on the outside of the bosses.

6. The synchronous pulley structure according to claim 5, characterized in that, The extension length of the boss is less than the thickness of the annular retaining edge, the threaded fastener is connected to the boss, and the edge of the threaded fastener abuts against the inner ring of the annular retaining edge.

7. The synchronous pulley structure according to claim 5, characterized in that, The boss is provided with at least 6 connecting holes, which are used to cooperate with the threaded fastener to fix the annular retaining edge to the pulley body.

8. The synchronous pulley structure according to claim 5, characterized in that, The pulley body has a shaft hole at its center that passes through the pulley body and the boss.

9. The synchronous pulley structure according to any one of claims 1 to 3, characterized in that, The threaded fastener is one of the following: bolt, screw, or screw.

10. The synchronous pulley structure according to any one of claims 1 to 3, characterized in that, The thickness of the circular retaining edge is 1-1.5mm.

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