CN113580466A

CN113580466A - Synchronous belt pulley and preparation method thereof

Info

Publication number: CN113580466A
Application number: CN202110862423.4A
Authority: CN
Inventors: 季思成; 何国鑫; 何锡田
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-11-02
Anticipated expiration: 2041-07-29
Also published as: CN113580466B

Abstract

The invention provides a synchronous belt pulley and a preparation method thereof, wherein the synchronous belt pulley comprises a metal inner core arranged at the center of the synchronous belt pulley, and the synchronous belt pulley also comprises: the transmission main body is arranged around the metal inner core and attached to the outer surface of the metal inner core, and gears are arranged on the outer side edge of the transmission main body to provide synchronous transmission; the metal ring is embedded in the transmission main body and is arranged concentrically with the metal inner core, and the radius of the metal ring is larger than that of the metal inner core. After the technical scheme is adopted, the synchronous belt wheels have consistent tooth profiles, the whole synchronous belt wheels are not easy to deform, and the metal inner cores and the metal rings are not easy to fall off.

Description

Synchronous belt pulley and preparation method thereof

Technical Field

The invention relates to the field of mechanical transmission, in particular to a synchronous belt pulley and a preparation method thereof.

Background

At present, metal materials are widely used for producing synchronous pulleys for mechanical transmission, and metal processing type synchronous pulleys need to be produced by devices such as a cutting machine, a numerical control lathe, a hobbing machine, a broaching machine, an inner hole grinding machine, an outer circle grinding machine, a deburring machine, a spin riveting machine and the like. Therefore, the synchronous belt pulley has various production processes, so that the process is complex, the labor cost is high, and the production efficiency is low. In the production process, chemical materials such as cutting fluid, lubricating oil, nitric acid (surface treatment process) and the like are used, so that resource waste is caused, the environment is polluted, and the production cost of the synchronous pulley is increased.

In order to reduce the production cost, technical personnel in the field use an injection molding mode to produce the plastic synchronous belt pulley, but the technical problems that the product is easy to be elliptical due to uneven material shrinkage and the like in the forming process, the overall jumping is generally more than 0.3MM, so that the product cannot be normally used, and the problems of high two sides and sunken middle part are caused due to uneven shrinkage, so that the tooth profile consistency is poor, and abnormal sound is caused in the process of meshing transmission with the synchronous belt.

Therefore, a novel synchronous pulley structure is needed, which can ensure high tooth profile precision, accurate outer diameter size, stable overall structure, difficult deformation and high concentricity of the outer diameter and the inner hole of the synchronous pulley.

Disclosure of Invention

In order to overcome the technical defects, the invention aims to provide a synchronous pulley and a preparation method thereof, so that the synchronous pulley has consistent tooth shape, the whole synchronous pulley is not easy to deform, and the metal inner core and the metal ring are not easy to fall off.

The invention discloses a synchronous pulley, which comprises a metal inner core arranged at the center of the synchronous pulley, and the synchronous pulley also comprises:

the transmission main body is arranged around the metal inner core and attached to the outer surface of the metal inner core, and gears are arranged on the outer side edge of the transmission main body to provide synchronous transmission;

the metal ring is embedded in the transmission main body and is arranged concentrically with the metal inner core, and the radius of the metal ring is larger than that of the metal inner core.

Preferably, the metal core is annular, and the middle part of the metal core is through, and the metal core includes:

the groove extends radially from one end of the metal inner core to the other end of the metal inner core along the outer wall or the inner wall of the metal inner core, or is formed by extending along the circumferential direction of the outer wall of the metal inner core.

Preferably, the transmission body comprises:

the first annular main body surrounds the metal inner core and is attached to the outer wall of the metal inner core;

the second annular main body is arranged around the outside of the first annular main body and is indirectly connected with the first annular main body, and the metal ring is embedded in the second annular main body;

at least one reinforcing rib connected between the first annular main body and the second annular main body along the radial direction of the transmission main body;

and the bottom plate is connected with the common end surfaces of the first annular main body, the second annular main body and the reinforcing ribs to form the bottom surface of the transmission main body.

Preferably, the middle part of each reinforcing rib is provided with a mounting hole;

the mounting hole extends towards the bottom plate and penetrates through the bottom plate, so that the mounting hole penetrates through the transmission main body in the axial direction;

the first annular body, the second annular body and the bottom plate are integrally formed.

Preferably, the mounting end surface of the first annular main body, which faces away from the bottom plate, is provided with a mounting groove, and the mounting groove is arranged around the inner wall of the first annular main body;

the synchronous belt pulley further comprises a flange and an installation element, a through hole opposite to the installation hole is formed in the flange, and the installation element penetrates through the through hole and the installation hole to enable the flange to be fixedly installed in the installation groove.

Preferably, the timing pulley comprises:

the metal connecting rib is connected between the metal inner core and the metal ring along the radial direction of the synchronous belt pulley, so that the metal inner core and the metal ring are integrated;

the middle part of the metal connecting rib is provided with a mounting hole.

Preferably, the metal inner core and the metal ring are filled with metal, so that the metal inner core and the metal ring are integrally tubular.

The invention also discloses a preparation method of the synchronous pulley, which comprises the following steps:

taking a plastic synchronous belt pulley forming die, and placing a metal inner core and a metal ring in the plastic synchronous belt pulley forming die in a mode that the metal ring concentrically surrounds the metal inner core;

injecting a nylon material into a plastic synchronous pulley forming mold, and cooling to form a transmission main body with a gear arranged on the outer side edge;

machining the metal inner core so that the metal inner core is concentric with the transmission main body;

in the mounting holes formed at both sides of the transmission main body, metal rivets are mounted into the mounting holes using a riveting machine to fix the baffle plates to both sides of the transmission main body.

Preferably, the size of the plastic synchronous pulley forming die is larger than the size of the transmission main body by 0.01-0.5 mm;

the step of moulding plastics nylon material to plastics synchronous pulley forming die to form the transmission main part that the outside limit was equipped with the gear after the cooling includes:

injecting a nylon material into a plastic synchronous pulley forming mould by an injection molding process with the injection pressure of 8MPa-15MPa and the injection temperature of 200-260 ℃;

primarily cooling the nylon material within 10s-60s, and secondarily cooling for more than or equal to 24 hours after injection molding.

Preferably, the nylon material has glass fibers therein;

the metal inner core comprises any one of a bearing hole, a key groove hole and a threaded hole.

After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:

1. the metal inner core and the metal ring can ensure that the stability of the transmission main body of the plastic belt wheel can be still maintained in all directions when the transmission main body is greatly contracted;

2. after the metal ring is arranged, the consistency and the accuracy of the outer diameter and the tooth shape of the plastic synchronous belt wheel can be avoided, the integral strength of the plastic synchronous belt wheel is increased, and the synchronous belt wheel is ensured not to deform or lose efficacy after being used for a long time;

3. after the plastic synchronous belt pulley is formed, a synchronous belt pulley tooth-shaped tool is used for clamping a synchronous belt pulley tooth part to process an inner hole, so that the outer diameter of the synchronous belt pulley and the concentricity of the inner hole are ensured, and the requirement of product jumping is ensured;

4. the metal flanges on the two sides are installed in a rivet riveting mode, and the product flanges are prevented from falling under the stress condition.

Drawings

FIG. 1 is an exploded view of a timing pulley in accordance with one embodiment of the present invention;

FIG. 2 is an exploded view of a timing pulley according to a second embodiment of the present invention;

fig. 3 is a schematic flow chart of a method for manufacturing a synchronous pulley according to a preferred embodiment of the present invention.

Reference numerals:

100-a synchronous pulley;

110-metal inner core, 111-groove,

120-transmission body, 121-gear, 122-first annular body, 123-second annular body, 124-reinforcing rib, 125-bottom plate, 126-mounting hole;

130-a metal ring;

140-metal connecting ribs;

150-rivets;

160-rib, 161-through hole and 162-positioning hole.

Detailed Description

The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.

Referring to fig. 1, a schematic diagram of a timing pulley 100 according to a preferred embodiment of the present invention is shown, in which the timing pulley 100 includes an inner metal core 110. The inner metal core 110 forms a portion of the synchronous pulley 100 that is firmly molded in the middle, and when the synchronous pulley 100 is subjected to an external pressing force, the inner metal core 110 has a stress that resists the pressing force to ensure the overall uniformity of the synchronous pulley 100. In addition to the metallic inner core 110, the synchronous pulley 100 includes a transmission body 120 and a metallic ring 130. The transmission main body 120 is a portion surrounding the metal core 110, and is attached to the outer surface of the metal core 110, so that there is no displacement between the transmission main body 120 and the metal core 110. The attaching manner may be interference fit between the transmission main body 120 and the metal core 110 during injection molding, or adhesion between the transmission main body 120 and the metal core 110 by using a viscous material. The outer side of the transmission body 120 has a gear 121 that engages, meshes or fits with the outer belt to provide synchronous transmission to the belt when rotating.

Due to the limited stress of the transmission body 120 itself, the integrity of the timing pulley 100 cannot be maintained as desired by the user by the metal inner core 110 alone when the belt squeezing force is applied. Thus, the transmission body 120 has a metal ring 130 embedded therein and is disposed in communication with the inner metal core 110 such that the metal ring 130 is located outside the inner metal core 110 and adjacent to the outer wall of the transmission body 120. The metal ring 130 may resist by its own stress when the transmission body 120 is squeezed by the conveyor belt to maintain the integrity of the timing pulley 100. Therefore, to achieve the above technical effects, the radius of the metal ring 130 is larger than that of the inner metal core 110, and the axial height of the metal ring 130 may be comparable to that of the inner metal core 110 to provide the stress to the maximum extent.

Preferably or alternatively, the metal ring 130 can be completely recessed within the drive body 120 or partially exposed from the drive body 120 (where the axial height of the drive body 120 is less than the longest axial height of the drive body 120).

With the above configuration, when the synchronous pulley 100 is used for a while, the metal ring 130 provides stress against the external pressing force, and prevents the transmission main body 120 from being deformed as a whole, particularly, deformed into an elliptical shape, to cause transmission failure. Even if the transmission main body 120 contracts, the metal ring 130 limits the contraction degree of the transmission main body 120, thereby preventing the inner metal core 110 and the transmission main body 120 from sliding, and further preventing the inner metal core 110 from falling off from the transmission main body 120. That is, the outer metal ring 130 can prevent the transmission main body 120 from being excessively deformed, and the inner metal ring 130 can prevent the inner metal core 110 from falling off.

In a preferred embodiment, the middle of the metal core 110 is through, and the metal core 110 includes a groove 111, and the groove 111 is disposed on the outer wall of the metal core 110, and may be horizontal or vertical. I.e., radially extending from one end to the other end of the outer wall of the inner metal core 110, or extending in the circumferential direction of the outer wall of the inner metal core 110. No matter the arrangement is horizontal or vertical, the quantity of recess 111 can be many, and transmission main body 120 will pack into the recess 111, increases the area of contact of metal inner core 110 and transmission main body 120, strengthens the cohesion of both.

The following is a description of the design of the inner metal core 110 and the metal ring 130 according to various embodiments.

Example one

With continued reference to fig. 1, preferably or alternatively, the transmission body 120 specifically includes: a first annular body 123, a second annular body 123, reinforcing ribs 124, and a bottom plate 125. The first annular body 123 surrounds the metal core 110 and is a part attached to the outer wall of the metal core 110, so that the first annular body 123 is concentric with the metal core 110, and the radial width of the first annular body 123 may be slightly smaller than that of the metal core 110. It will be appreciated that the radial width is calculated from the body having the metallic inner core 110 and the first annular body 123, and not from the center of the circle. The second annular body 123 is disposed around the first annular body 123 and is indirectly connected to the first annular body 123, i.e., is not attached to the first annular body 123, and the first annular body 123 and the second annular body 123 are connected by the reinforcing rib 124. And the metal ring 130 is embedded in the second annular body 123 so as to be as close as possible to the outer wall of the synchronous pulley 100. At least one reinforcing rib 124 is connected between the first annular body 123 and the second annular body 123 along the radial direction of the transmission body 120, and plays a role in reinforcing the strength of the transmission body 120. The base plate 125 is connected to the common end surfaces of the first annular body 123, the second annular body 123, and the reinforcing rib 124, for example, the base plate 125 is disposed on a radial end surface of the synchronous pulley 100, and encloses the first annular body 123 and the reinforcing rib 124 to form the bottom surface of the transmission body 120.

Further, a mounting hole 126 is provided in the middle of each reinforcing rib 124, and the mounting hole 126 extends from the end surface where the bottom plate 125 is not provided to the end surface where the bottom plate 125 is provided, and penetrates through the bottom plate 125, so that the mounting hole 126 penetrates in the axial direction. The first and second annular bodies 123 and the bottom plate 125 may be integrally formed by an injection molding process, thereby further enhancing strength.

Preferably or optionally, the mounting surface of the first annular body 123 facing away from the bottom plate 125 is provided with a mounting groove which is arranged around the inner wall of the first annular body 123, so that when other elements need to be mounted on the mounting surface, the other elements will be clamped into the mounting groove. Correspondingly, the timing pulley 100 includes ribs 160 and mounting elements. The rib 160 is disc-shaped, and the middle portion of the rib is hollowed to correspond to the metal core 110, and when the rib 160 is placed on the installation surface and outside the bottom plate 125, the hollowed portion of the middle portion is just engaged with the metal core 110 (or a nylon layer is further disposed outside the metal core 110). In order to fix the rib 160 to the timing pulley 100, the rib 160 is provided with a through hole 161 opposite to the mounting hole 126, and when the rib 160 is placed in the mounting groove, the rib 160 can be fixed by penetrating the through hole 161 and the mounting hole 126 with the mounting member. In a preferred embodiment, the ribs 160 are provided on both end surfaces of the transmission main body 120, the number of the through holes 161 provided on the ribs 160 and the number of the mounting holes 126 provided on the reinforcing ribs 124 are 3-6, the mounting elements are rivets 150, which are also 3-6, and the ribs 160 are integrated with the transmission main body 120 after the rivets 150 are driven into the mounting holes 126 and the through holes 161.

Example two

Referring to fig. 2, in this embodiment, the inner metal core 110 and the metal ring 130 are not connected by the transmission main body 120, and conversely, the synchronous pulley 100 includes a metal connecting rib 140 connected between the inner metal core 110 and the metal ring 130 along the radial direction of the synchronous pulley 100, so that the inner metal core 110 and the metal ring 130 are integrated into a single body, thereby saving the manufacturing process of the inner metal core 110 and the metal ring 130 and further enhancing the strength of the synchronous pulley 100. The metal connecting rib 140 has a mounting hole 126 at the middle portion thereof, so that the rib 160 can be fixed by the rivet 150 penetrating the mounting hole 126 when the rib 160 is mounted in the second embodiment.

EXAMPLE III

On the basis of the second embodiment, the metal core and the metal ring are filled with the same material, or the metal core and the metal ring are directly and integrally demoulded during preparation, so that the metal core and the metal ring are integrally tubular. The strength of this embodiment is greatest. In some practical application scenes, the flange can be directly used without being installed.

In another preferred embodiment, the rib may further be designed with at least one positioning hole 162 for installation, and the positioning hole may be configured beside the through hole.

Referring to fig. 3, a method for manufacturing a synchronous pulley in a preferred embodiment is disclosed, which includes the steps of:

s100: taking a plastic synchronous belt pulley forming die, and placing a metal inner core and a metal ring in the plastic synchronous belt pulley forming die in a mode that the metal ring concentrically surrounds the metal inner core;

s200: injecting a nylon material into a plastic synchronous pulley forming mold, and cooling to form a transmission main body with a gear arranged on the outer side edge;

s300: the metal inner core is processed to be concentric with the transmission main body, for example, a numerical control lathe can be used for clamping the tooth surface (outer diameter surface) of the plastic synchronous pulley, and the metal inner core is processed to ensure the concentricity of the outer diameter of the plastic synchronous pulley and the inner hole of the metal inner core;

s400: in the mounting hole that transmission main part both sides formed, use the riveter installation metal rivet to the mounting hole in to the flange of both sides is fixed through the riveted mode to the both sides of fixed stop to transmission main part, can guarantee that the flange can not drop.

Preferably or alternatively, the size of the plastic synchronous pulley forming die is larger than the size of the transmission main body by 0.01mm-0.5 mm. The step S200 of injecting a nylon material into the plastic synchronous pulley forming mold and cooling the nylon material to form a transmission main body having a gear on an outer side thereof includes:

s210: injecting a nylon material into a plastic synchronous pulley forming mould by an injection molding process with the injection pressure of 8MPa-15MPa and the injection temperature of 200-260 ℃;

s220: primarily cooling the nylon material within 10s-60s, and secondarily cooling for more than or equal to 24 hours after injection molding.

Preferably or optionally, the nylon material has glass fibers therein; the metal inner core comprises any one of a bearing hole, a key groove hole and a threaded hole.

It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.

Claims

1. The utility model provides a synchronous pulley, is including locating the metal inner core at synchronous pulley center, its characterized in that, synchronous pulley still includes:

the metal ring is embedded in the transmission main body and is concentrically arranged with the metal inner core, and the radius of the metal ring is larger than that of the metal inner core.

2. The synchronous pulley according to claim 1, wherein said metal core is annular and has a central portion extending therethrough, said metal core comprising:

and the groove extends radially from one end of the metal inner core to the other end of the metal inner core along the outer wall or the inner wall of the metal inner core, or is formed by extending along the circumferential direction of the outer wall of the metal inner core.

3. The synchronous pulley according to claim 1, wherein the transmission body comprises:

at least one reinforcing rib connected between the first annular main body and the second annular main body along the radial direction of the transmission main body; and the bottom plate is connected with the common end faces of the first annular main body, the second annular main body and the reinforcing ribs to form the bottom face of the transmission main body.

4. The synchronous pulley according to claim 3, wherein a mounting hole is provided in a middle portion of each of the reinforcing ribs;

the first annular main body, the second annular main body and the bottom plate are integrally formed.

5. A synchronous pulley as claimed in claim 4,

the mounting end face of the first annular main body, which faces away from the bottom plate, is provided with a mounting groove, and the mounting groove is arranged around the inner wall of the first annular main body;

the synchronous belt pulley further comprises a flange and an installation element, wherein the flange is provided with a through hole opposite to the installation hole, and the installation element penetrates through the through hole and the installation hole to enable the flange to be fixedly installed in the installation groove.

6. The synchronous pulley as recited in claim 1, wherein the synchronous pulley comprises:

and the middle part of the metal connecting rib is provided with a mounting hole.

7. The synchronous pulley according to claim 1, wherein the metal core and the metal ring are filled with metal therebetween such that the metal core and the metal ring are integrally tubular.

8. A preparation method of a synchronous pulley is characterized by comprising the following steps:

machining a metal inner core so that the metal inner core is concentric with the transmission body;

9. The method according to claim 8,

the size of the plastic synchronous pulley forming die is larger than that of the transmission main body by 0.01-0.5 mm;

10. The method according to claim 8,

the nylon material is internally provided with glass fiber;