CN113580466B

CN113580466B - Synchronous pulley and preparation method thereof

Info

Publication number: CN113580466B
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: 2023-04-25
Anticipated expiration: 2041-07-29
Also published as: CN113580466A

Abstract

The invention provides a synchronous pulley and a preparation method, wherein the synchronous pulley comprises a metal inner core arranged in the center of the synchronous pulley, and the synchronous pulley further comprises: the transmission main body is arranged outside the metal inner core in a surrounding manner and is 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 tooth shape of the synchronous pulley is consistent, the whole synchronous pulley is not easy to deform, and the metal inner core and the metal ring are not easy to fall off.

Description

Synchronous pulley and preparation method thereof

Technical Field

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

Background

At present, the synchronous belt pulley for mechanical transmission is produced by widely adopting metal materials, and the metal processing type synchronous belt pulley needs to be used in cutting machines, numerical control lathes, gear hobbing machines, broaching machines, inner hole grinding machines, cylindrical grinding machines, deburring machines, spin riveting machines and other equipment. Therefore, the synchronous pulley has a plurality of production procedures, 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 production cost, a person skilled in the art uses an injection molding mode to produce the plastic synchronous pulley, but in the molding process, the problem that the product is easy to be elliptical is caused by the technical problems of uneven material shrinkage and the like, the integral jump is generally more than 0.3MM, so that the plastic synchronous pulley cannot be normally used, and due to uneven shrinkage, the problem that the consistency of tooth shapes is poor, the two sides are high and the middle is concave is usually caused, and abnormal noise is caused in the process of meshing transmission with a synchronous belt.

Therefore, a novel synchronous pulley structure is needed, so that the synchronous pulley has high tooth form precision, accurate outer diameter size, stable integral structure, difficult deformation and high concentricity of the outer diameter and the inner hole.

Disclosure of Invention

In order to overcome the technical defects, the invention aims to provide the synchronous pulley and the preparation method thereof, so that the tooth shape of the synchronous pulley is consistent, 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 in the center of the synchronous pulley, and further comprises:

the transmission main body is arranged outside the metal inner core in a surrounding manner and is 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 inner core is annular, and the middle part of the metal inner core is through, and the metal inner core includes:

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

Preferably, the transmission body includes:

the first annular main body is arranged outside the metal inner core in a surrounding manner and is attached to the outer wall of the metal inner core;

the second annular main body is arranged outside the first annular main body in a surrounding manner 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;

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 strengthening rib is provided with a mounting hole;

the mounting hole extends to the bottom plate and penetrates through the bottom plate, so that the mounting hole penetrates through along the axial direction of the transmission main body;

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

Preferably, the mounting end surface of the first annular main body facing 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 pulley further comprises a flange and a mounting element, a through hole opposite to the mounting hole is formed in the flange, and the mounting element penetrates through the through hole and the mounting hole to enable the flange to be fixedly mounted in the mounting groove.

Preferably, the synchronous pulley includes:

the metal connecting ribs are connected between the metal inner core and the metal ring along the radial direction of the synchronous 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 core and the metal ring are filled with metal, so that the metal core and the metal ring are tubular as a whole.

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

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

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

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

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

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

the step of injecting nylon material into the plastic synchronous pulley forming die and forming a transmission main body with a gear on the outer side after cooling comprises the following steps:

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

and (3) 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 transmission main body of the plastic belt wheel can still keep stability in all directions when being contracted greatly;

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

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

4. the rivet riveting mode is used for installing the metal flanges on two sides, so that the product flanges are prevented from falling under the condition of stress.

Drawings

FIG. 1 is an exploded view of a synchronous pulley according to a first embodiment of the present invention;

FIG. 2 is an exploded view of a synchronous 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-synchronous pulleys;

110-metal inner core, 111-groove,

120-a transmission main body, 121-a gear, 122-a second annular main body, 123-a first annular main body, 124-reinforcing ribs, 125-a bottom plate and 126-mounting holes;

130-metal ring;

140-metal connecting ribs;

150-rivets;

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

Detailed Description

Advantages of the invention are further illustrated in the following description, taken in conjunction with the accompanying drawings and detailed description.

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying 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 or all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, these 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 "at … …" or "responsive to a determination", depending on the context.

In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.

In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present invention, and are not of specific significance per se. Thus, "module" and "component" may be used in combination.

Referring to fig. 1, a schematic structural view of a synchronous pulley 100 according to a preferred embodiment of the present invention is shown, wherein the synchronous pulley 100 includes a metallic inner core 110. The metal inner 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 metal inner core 110 has a stress that resists the pressing force of the portion to ensure the overall consistency of the synchronous pulley 100. In addition to the metallic inner core 110, the synchronous pulley 100 also includes a drive body 120 and a metallic ring 130. The transmission body 120 is a portion surrounding the metal core 110 and is attached to the outer surface of the metal core 110, so that no displacement exists between the transmission body 120 and the metal core 110. The bonding mode can be interference fit with the metal inner core 110 when the transmission main body 120 is injection molded, or adhesive material is adopted to bond the transmission main body 120 and the metal inner core 110. The outer side of the drive body 120 has gears 121 that mesh, engage or fit with an external conveyor belt to provide a synchronous drive to the conveyor belt when rotated.

Due to the limited stress of the transmission body 120 itself, the metal core 110 alone cannot maintain the integrity of the pulley 100 as desired by the user when the belt's compressive force is received. Thus, the transmission body 120 has the metal ring 130 embedded therein and is disposed in communication with the metal core 110 such that the metal ring 130 is located outside the metal core 110 and proximate to the outer wall of the transmission body 120. When the drive body 120 receives belt compression, the metal ring 130 may resist against its own stress to maintain the integrity of the synchronous pulley 100. Thus, to achieve the above technical effect, the radius of the metal ring 130 is larger than the radius of the metal core 110, and the axial height of the metal ring 130 may be comparable to the axial height of the metal core 110 to provide the stress to the maximum.

Preferably or alternatively, the metal ring 130 may be entirely recessed within the drive body 120, or partially exposed to 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 period of time, the metal ring 130 provides stress against the external pressing force, so as to avoid the situation that the transmission main body 120 is deformed as a whole, particularly deformed into an elliptical shape, resulting in transmission failure. And even if the transmission main body 120 is contracted, the metal ring 130 limits the contraction degree of the transmission main body 120, so as to avoid the sliding between the metal inner core 110 and the transmission main body 120, and further avoid the problem that the metal inner core 110 falls off from the transmission main body 120. That is, the outer metal ring 130 can prevent the transmission body 120 from being excessively deformed, and the inner metal ring 130 can prevent the metal core 110 from falling off.

In a preferred embodiment, the middle portion of the metal core 110 is penetrated, and the metal core 110 includes a groove 111, and the groove 111 is disposed on the outer wall of the metal core 110, which may be in a horizontal or vertical direction. I.e., along the outer wall of the metal core 110, extending radially from one end thereof to the other end, or along the circumference of the outer wall of the metal core 110. The number of the grooves 111 can be multiple, and the transmission main body 120 is filled in the grooves 111, so that the contact area between the metal inner core 110 and the transmission main body 120 is increased, and the binding force of the metal inner core and the transmission main body 120 is enhanced.

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

Example 1

With continued reference to fig. 1, preferably or alternatively, the transmission body 120 specifically includes: a first annular body 123, a second annular body 122, a reinforcing rib 124 and a bottom plate 125. The first annular body 123 is disposed around the metal core 110 as a portion that is bonded to the outer wall of the metal core 110, so that the first annular body 123 is disposed concentrically with the metal core 110 and the radial width may be slightly smaller than the radial width of the metal core 110. It will be appreciated that the radial width is calculated from the body having the metal core 110 and the first annular body 123, and not from the center of the circle. The second annular body 122 is disposed around the first annular body 123, and is indirectly connected to the first annular body 123, that is, is not bonded to the first annular body 123, and the first annular body 123 and the second annular body 122 are connected by the reinforcing rib 124. And the metal ring 130 is embedded in the second annular body 122 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 122 in the radial direction of the transmission body 120, and functions to reinforce the strength of the transmission body 120. The bottom plate 125 is connected to the common end surfaces of the first annular body 123, the second annular body 122 and the reinforcing ribs 124, for example, the bottom plate 125 is disposed on a radial end surface of the synchronous pulley 100, and seals the first annular body 123 and the reinforcing ribs 124 to form a bottom surface of the transmission body 120.

Further, the middle portion of each reinforcing rib 124 is provided with a mounting hole 126, and the mounting hole 126 extends from the end surface provided with the bottom plate 125 to the end surface provided with the bottom plate 125, and penetrates the bottom plate 125 such that the mounting hole 126 penetrates in the axial direction. And the first and second annular bodies 123 and 122 and the bottom plate 125 may be integrally formed through an injection molding process, further enhancing strength.

Preferably or alternatively, the mounting surface of the first annular body 123 facing away from the base plate 125 is provided with a mounting groove which is provided around the inner wall of the first annular body 123 such that when a further component is required to be mounted on the mounting surface, the further component will snap into the mounting groove. Correspondingly, the synchronous pulley 100 includes a flange 160 and a mounting element. The flange 160 is disc-shaped, and the middle portion is hollowed out to correspond to the metal inner core 110, when the flange 160 is placed on the mounting surface and outside the bottom plate 125, the middle portion is just clamped with the metal inner core 110 (or a nylon layer is further arranged outside the metal inner core 110). In order to fix the flange 160 to the synchronous pulley 100, a through hole 161 opposite to the mounting hole 126 is provided in the flange 160, and when the flange 160 is placed in the mounting groove, the flange 160 is fixed after the mounting member penetrates the through hole 161 and the mounting hole 126. In a preferred embodiment, the flanges 160 are disposed on two end surfaces of the transmission main body 120, the number of through holes 161 disposed on the flanges 160, and 3-6 mounting holes 126 disposed on the reinforcing ribs 124 are used as the mounting elements, and the rivets 150, which are 3-6, are driven into the mounting holes 126 and the through holes 161, so that the flanges 160 are integrated with the transmission main body 120.

Example two

Referring to fig. 2, in this embodiment, the metal core 110 and the metal ring 130 are not connected through the transmission main body 120, whereas the synchronous pulley 100 includes metal connecting ribs 140 connected between the metal core 110 and the metal ring 130 along the radial direction of the synchronous pulley 100, so that the metal core 110 and the metal ring 130 are integrated, the manufacturing process of the metal core 110 and the metal ring 130 is saved, and the strength of the synchronous pulley 100 is further enhanced. The middle of the metal connecting rib 140 is provided with the mounting hole 126, so that when the flange 160 is mounted in the second embodiment, the rivet 150 can still penetrate into the mounting hole 126 to fix the flange 160.

Example III

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

In a further preferred embodiment, the flange may be further provided with positioning holes 162 for mounting, at least one of which is disposed beside the through hole.

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

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

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

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

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

Preferably or alternatively, the plastic timing pulley forming die has a size greater than 0.01mm-0.5mm compared to the size of the drive body. The step S200 of injecting nylon material into the plastic synchronous pulley forming mold and forming the transmission main body with the gear on the outer side after cooling includes:

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

s220: and (3) primarily cooling the nylon material within 10s-60s, and secondarily cooling for more than or equal to 24 hours after injection molding.

Preferably or alternatively, 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 are preferred and not limited in any way, and any person skilled in the art may make use of the above-disclosed technical content to change or modify the same into equivalent effective embodiments without departing from the technical scope of the present invention, and any modification or equivalent change and modification of the above-described embodiments according to the technical substance of the present invention still falls within the scope of the technical scope of the present invention.

Claims

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

the transmission main body is arranged outside the metal inner core in a surrounding mode and is 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, the radius of the metal ring is larger than that of the metal inner core,

the transmission body includes:

the first annular main body is arranged outside the metal inner core in a surrounding mode and is attached to the outer wall of the metal inner core;

the second annular main body is arranged outside the first annular main body in a surrounding mode 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; 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;

the middle part of each strengthening 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 along the axial direction of the transmission main body;

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

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 pulley further comprises a flange and a mounting element, wherein the flange is provided with through holes opposite to the mounting holes, the mounting element penetrates through the through holes and the mounting holes to enable the flange to be fixedly mounted in the mounting groove, positioning holes for mounting are further designed on the flange, the number of the positioning holes is at least one, and the positioning holes are arranged beside the through holes.

2. The synchronous pulley of claim 1, wherein the metal inner core is annular and has a central portion extending therethrough, the metal inner core comprising:

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

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

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

4. The synchronous pulley as in claim 1, wherein the metal inner core and the metal ring are filled with metal such that the metal inner core and the metal ring are integrally tubular.

5. A method of manufacturing a synchronous pulley as claimed in any one of claims 1 to 4, comprising the steps of: taking a plastic synchronous pulley forming die, and placing the metal inner core and the metal ring in the plastic synchronous pulley forming die in a mode that the metal ring is concentrically arranged outside the metal inner core;

machining a metal inner core such that the metal inner core is concentric with the drive body;

6. The method according to claim 5, wherein,

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

7. The method according to claim 5, wherein,

glass fibers are arranged in the nylon material;