Injection mold capable of injection molding synchronous wheels of different widths

Abstract

This invention relates to the field of injection mold technology, and in particular to an injection mold capable of injection molding synchronous wheels of different widths. The mold includes an upper mold body and a lower mold body that are mated together. The upper mold body is equipped with a glue injection system, and an upper mold core that mates with the glue injection system is located at the lower end of the upper mold body. A lower mold core that mates with the upper mold core is located at the upper end of the lower mold body. A side passage receiving groove is provided on the side of the lower mold body, and the upper end of the side passage receiving groove has a connecting portion that penetrates the upper end of the lower mold body. Through the coordinated design of the power mechanism, the inclined pusher slide, the inclined ejector component, and the external tooth insert, the mating depth between the external tooth insert and the internal tooth through hole can be flexibly adjusted, thereby adjusting the width of the mold cavity. This allows for the adaptation to injection molding production of synchronous wheels of different widths without replacing the entire mold set, effectively reducing the design, processing, maintenance, and storage costs of the mold, and shortening the product production cycle.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to an injection mold capable of injection molding synchronous wheels of different widths. Background Technology

[0002] Synchronous pulleys are core components widely used in the field of mechanical transmission. With their advantages of smooth transmission, high precision, and low noise, they are widely used in power transmission systems of various industries such as automation equipment, automobiles, electronic instruments, and photovoltaic equipment. They are key basic components that ensure the efficient and stable operation of various mechanical devices.

[0003] In the prior art, the structure of a synchronous pulley typically includes a central metal assembly and plastic synchronous teeth that are injection molded around the metal assembly. The metal assembly is mainly used to ensure the structural strength and installation stability of the synchronous pulley, while the plastic synchronous teeth are used to mesh with the synchronous belt to achieve power transmission. This metal-plastic composite structure design takes into account both the load-bearing capacity of the synchronous pulley and reduces wear and noise during the transmission process.

[0004] In the manufacturing process of synchronous pulleys, plastic synchronous gears are typically produced using an overmolding injection molding process. This process requires a specialized overmolding injection mold to inject molten plastic raw material into the mold cavity. After the plastic cools and solidifies, it forms a firm bond with the metal components pre-placed within the mold, ultimately resulting in a complete synchronous pulley product. The structural rationality and adaptability of the overmolding injection mold directly affect the molding accuracy, production efficiency, and product consistency of the synchronous pulley, making it a core piece of equipment in the synchronous pulley manufacturing process.

[0005] However, the traditional overmolding injection molds currently used in the industry typically have fixed-size cavity designs. The width of the mold corresponds one-to-one with the width of a specific model of synchronous pulley, making it impossible to flexibly adjust the cavity width parameters according to actual production needs. With the rapid development of industrial automation, the market demand for synchronous pulley specifications is showing a diversified trend. The required width of synchronous pulleys varies significantly in different application scenarios. This necessitates the design and fabrication of a separate overmolding injection mold for each width specification when producing synchronous pulleys of different sizes.

[0006] The traditional overmolding injection mold design method described above has several insurmountable drawbacks: Firstly, the design, processing, and debugging of multiple molds require significant investment of manpower, resources, and capital, substantially increasing the manufacturing cost of synchronous pulleys. Furthermore, the long processing cycle of the molds extends the R&D and market launch cycle of synchronous pulley products, reducing the company's market competitiveness. Secondly, storing multiple molds requires substantial space resources, and the molds also require regular maintenance and upkeep during long-term storage and use, further increasing the company's operating costs and management burden. In addition, frequent mold changes reduce production efficiency, increase debugging errors during mold changes, and can easily affect the molding accuracy and product consistency of synchronous pulleys, making it difficult to meet the needs of large-scale, diversified production.

[0007] Therefore, it is necessary to propose an improved technical solution to address the above problems. Summary of the Invention

[0008] To overcome the shortcomings mentioned above, the present invention aims to provide a technical solution that can solve the above problems.

[0009] An injection mold capable of injection molding synchronous wheels of different widths includes an upper mold body and a lower mold body that are mated together. The upper mold body is provided with a glue injection system, and an upper mold core that abuts against the glue injection system is provided at the lower end of the upper mold body. A lower mold core that abuts against the upper mold core is provided at the upper end of the lower mold body. A side passage receiving slide groove is provided on the side of the lower mold body, and the upper end of the side passage receiving slide groove has a connecting part that penetrates through the upper end of the lower mold body. An internal toothed through hole is provided on the lower mold core, and a shaft insert that axially abuts against the internal toothed through hole is also provided on the lower mold body. An external toothed insert that matches the internal toothed through hole is slidably connected to the shaft core insert. The external toothed insert is connected to the internal toothed through hole from below the lower mold core along the connecting part, so that a mold cavity is formed between the upper mold core, the internal toothed through hole, the shaft core insert and the external toothed insert. An inclined ejector component is also slidably connected to the shaft core insert. The inclined ejector component is fixedly connected to the lower end of the external toothed insert. An inclined pusher slide is slidably connected to the side through receiving slide groove. A power mechanism for driving the inclined pusher slide is provided on the side of the lower mold body. The inclined pusher slide and the inclined ejector insert are in inclined face engagement.

[0010] Preferably, the mold cavity is used for injection molding of overmolded products, and a top insert is embedded in the upper mold core to abut against the core insert. The top insert and the external toothed insert are also used to press the product to be overmolded, which is sleeved on the core insert, against the core insert.

[0011] Preferably, the inclined pusher component includes a connecting block and a T-shaped block. The upper end of the inclined pusher has an inclined surface, and two limiting slides are provided on the inclined surface. A T-shaped groove is formed between the two limiting slides and the inclined pusher. The T-shaped block slides in slidable engagement with the T-shaped groove. The lower end of the connecting block is an inclined surface that abuts against the upper end of the limiting slide. The connecting block is fixedly connected to the T-shaped block, and the external tooth insert is fixedly connected to the connecting block.

[0012] Preferably, the inclination angle of the inclined surface is 5°-20°.

[0013] Preferably, the connecting block, the T-block, and the external tooth insert are all provided with through-holes, wherein the external tooth insert is in a sealed sliding fit with the core insert through the core hole, and the connecting block and the T-block are in a clearance fit with the core insert through the core hole; a through-hole first flat elongated hole is provided on the inclined push slider at the position between the two limiting slide bars, the width of the first flat elongated hole matches the diameter of the core insert, and the width of the first flat elongated hole is smaller than the width of the T-block, and the inclined push slider is in a clearance fit with the core insert through the first flat elongated hole.

[0014] Preferably, the power mechanism includes a motor base fixedly installed on the side of the lower mold body, a servo motor installed on the motor base, a lead screw body powered by the servo motor, and a lead screw slider threadedly connected to the lead screw body. The side of the inclined push slider is provided with a receiving hole for accommodating the lead screw body, and the lead screw slider is fixed at the opening position of the receiving hole.

[0015] Preferably, the injection system includes an injection port embedded in the upper end of the upper mold body, a runner inside the upper mold body, and multiple injection channels on the upper mold core. The injection port, runner, and injection channels are sequentially sealed and connected, and the multiple injection channels axially surround the upper end of the mold cavity.

[0016] Preferably, the lower mold body includes a lower template and a slide plate fixedly installed at the lower end of the lower template. A side passage accommodating slide groove is provided between the lower template and the slide plate, so that the inclined push slider can be guided and slid on the slide plate. The lower mold core is embedded in the lower template, the connecting part is opened on the lower template, and the shaft core insert is fixedly connected to the slide plate.

[0017] Preferably, the lower mold body further includes two square plates fixedly installed at the lower end of the slide plate, an ejection mechanism disposed between the two square plates, and a base plate fixedly installed at the lower end of the square plates. The ejection mechanism includes an ejection plate located between the two square plates and multiple ejector pins fixedly connected to the ejection plate. The multiple ejector pins are configured to surround the shaft insert. The external tooth insert and the inclined ejector component are provided with clearance through holes corresponding to the ejector pins, and the ejector pins and the clearance through holes on the external tooth insert are sealed and slidably engaged. The inclined push slider is provided with a second flat elongated hole corresponding to the ejector pin, and the ejector pins are in clearance engagement with the inclined push slider through the second flat elongated hole.

[0018] Preferably, the inclined pusher component includes a connecting block and a T-shaped block. The upper end of the inclined pusher has an inclined surface, and two limiting slides are provided on the inclined surface. A T-shaped groove is formed between the two limiting slides and the inclined pusher. The T-shaped block slides in slidable engagement with the T-shaped groove. The lower end of the connecting block is an inclined surface that abuts against the upper end of the limiting slides. The connecting block is fixedly connected to the T-shaped block. The external tooth insert is fixedly connected to the connecting block. Both the connecting block and the T-shaped block are provided with threaded through holes. The connecting block and the T-shaped block are threadedly connected to an external threaded sleeve through the threaded through holes. The connecting block and the T-shaped block are fixedly engaged through the external threaded sleeve. The inner side of the external threaded sleeve serves as a clearance through hole for the ejector pin to make room.

[0019] Compared with the prior art, the beneficial effects of the present invention are: Through the coordinated design of the power mechanism, inclined pusher slide, inclined ejector component, and external tooth insert, the mating depth between the external tooth insert and the internal tooth through hole can be flexibly adjusted, thereby adjusting the width of the mold cavity. This allows for the adaptation to injection molding production of synchronous pulleys of different widths without replacing the entire mold set, effectively reducing mold design, processing, maintenance, and storage costs, and shortening the product production cycle. Simultaneously, the precise mating of the shaft insert, external tooth insert, and internal tooth through hole ensures the molding accuracy of the mold cavity, reduces debugging errors caused by mold replacement, and improves the consistency and pass rate of synchronous pulley products. Furthermore, the entire width adjustment process is driven by the power mechanism, making operation convenient and efficient, effectively improving production efficiency and meeting the needs of large-scale, diversified synchronous pulley production.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention in the mold-closed state; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention in the mold-closed state; Figure 3 This is a schematic diagram of the cross-sectional structure of the present invention in the mold-open state; Figure 4 This is a schematic diagram of the structure of the external tooth insert and the inclined pusher slider in the present invention. Figure 5This is a schematic diagram showing the disassembled structure of the inclined push slider and the inclined top component in this invention.

[0023] The reference numerals and names in the figure are as follows: Upper mold body 10, lower mold body 20, lower template 201, slide plate 202, square plate 203, base plate 204, ejector plate 205, ejector pin 206, side through accommodating slide 21, connecting part 22, shaft core insert 23, external tooth insert 24, glue injection system 30, glue inlet 31, runner 32, glue injection channel 33, upper mold core 40, top insert 41, lower mold core 50, internal tooth through hole 51, inclined ejector component 60, connecting block 61, T-block 62, external threaded sleeve 63, inclined push slider 70, limiting slide bar 71, T-slot 72, first flat elongated hole 73, second flat elongated hole 74, power mechanism 80, motor base 81, servo motor 82, lead screw body 83, lead screw slider 84, accommodating hole 85. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1-5 In this embodiment of the invention, an injection mold capable of injection molding synchronous wheels of different widths includes an upper mold body 10 and a lower mold body 20 that are mated together. The upper mold body 10 is provided with a glue injection system 30, and an upper mold core 40 that is mated to the glue injection system 30 is provided at the lower end of the upper mold body 10. A lower mold core 50 that is mated to the upper mold core 40 is provided at the upper end of the lower mold body 20. A side passage receiving slide groove 21 is provided on the side of the lower mold body 20, and the upper end of the side passage receiving slide groove 21 has a connecting part 22 that penetrates the upper end of the lower mold body 20. An internal tooth through hole 51 that penetrates the lower part is provided on the lower mold core 50, and a shaft core that is axially mated to the internal tooth through hole 51 is also provided on the lower mold body 20. Insert 23, the shaft core insert 23 is slidably connected to an external tooth insert 24 that matches the internal tooth through hole 51, the external tooth insert 24 is connected to the internal tooth through hole 51 from below the lower mold core 50 along the connecting part 22, so that a mold cavity is formed between the upper mold core 40, the internal tooth through hole 51, the shaft core insert 23 and the external tooth insert 24; a slidable ejector component 60 is also slidably connected to the shaft core insert 23, the slidable ejector component 60 is fixedly connected to the lower end of the external tooth insert 24, a slidable pusher slide block 70 is slidably connected to the side through receiving slide groove 21, and a power mechanism 80 for driving the slidable pusher slide block 70 to move is provided on the side of the lower mold body 20, the slidable pusher slide block 70 and the slidable ejector insert are in oblique face engagement.

[0026] Before injection molding, according to the required width of the synchronous pulley, the power mechanism 80 drives the inclined pusher slide 70 in the side passage accommodating slide groove 21 to move. The inclined pusher slide 70 engages with the inclined ejector component 60, pushing the inclined ejector component 60 to slide along the shaft insert 23. This, in turn, causes the external tooth insert 24, which is fixedly connected to the inclined ejector component 60, to slide up and down along the connecting part 22. The depth of the external tooth insert 24 engaging with the internal tooth through hole 51 of the lower mold core 50 is adjusted, so that the upper mold core 40 and the internal tooth... A mold cavity matching the width of the target synchronous wheel is formed between the through hole 51, the shaft insert 23, and the external tooth insert 24. Then, the metal kit is fitted onto the shaft insert 23, and molten plastic is injected into the mold cavity through the glue injection system 30 of the upper mold body 10. After the plastic cools and solidifies, the power mechanism 80 drives the inclined push slider 70 to move in the opposite direction, and the inclined ejector 60 drives the external tooth insert 24 to move downward and disengage from the internal tooth through hole 51, thus completing the demolding of the synchronous wheel and realizing the injection molding of synchronous wheels of different widths.

[0027] Through the coordinated design of the power mechanism 80, the inclined pusher slide 70, the inclined ejector component 60, and the external tooth insert 24, the mating depth between the external tooth insert 24 and the internal tooth through hole 51 can be flexibly adjusted, thereby adjusting the width of the mold cavity. This allows for the adaptation to injection molding production of synchronous pulleys of different widths without replacing the entire mold set, effectively reducing the design, processing, maintenance, and storage costs of the mold and shortening the product production cycle. At the same time, the precise mating of the shaft insert 23, the external tooth insert 24, and the internal tooth through hole 51 ensures the molding accuracy of the mold cavity, reduces debugging errors caused by mold replacement, and improves the consistency and pass rate of synchronous pulley products. In addition, the entire width adjustment process is driven by the power mechanism 80, making operation convenient and efficient, effectively improving production efficiency and meeting the needs of large-scale and diversified synchronous pulley production.

[0028] In the above technical solution, the mold cavity is used for injection molding of overmolded products. A top insert 41 is embedded in the upper mold core 40, which abuts against the shaft core insert 23. The top insert 41 and the external toothed insert 24 are also used to press the product to be overmolded, which is fitted onto the shaft core insert 23, together. The mold cavity, as the core area of ​​overmolding injection molding, is used to carry the molten plastic and form the plastic synchronous teeth of the synchronous wheel, so as to achieve a firm bond between the metal kit to be overmolded and the plastic. The top insert 41 is embedded in the upper mold core 40, which abuts against the shaft core insert 23. At the same time, it cooperates with the external toothed insert 24. When the metal kit to be overmolded is fitted onto the shaft core insert 23, the top insert 41 abuts against the metal kit from above, and the external toothed insert 24 supports it from below. The two work together to firmly press and fix the metal kit to be overmolded, ensuring that the metal kit will not shift or shake during the injection molding process. Its core function is to improve the stability of the injection molding process, avoid misalignment and uneven wall thickness of the plastic synchronous teeth caused by the displacement of the metal components, thereby ensuring the molding accuracy and product quality of the synchronous wheel, and further optimize the bonding effect of the overmolding, and enhance the connection between the metal components and the plastic synchronous teeth.

[0029] Please see Figure 4-5The inclined pusher component 60 includes a connecting block 61 and a T-shaped block 62. The upper end of the inclined pusher slider 70 has an inclined surface, on which two limiting slide bars 71 are provided. A T-shaped groove 72 is formed between the two limiting slide bars 71 and the inclined pusher slider 70. The T-shaped block 62 slides in cooperation with the T-shaped groove 72. The lower end of the connecting block 61 is an inclined surface that abuts against the upper end of the limiting slide bar 71. The connecting block 61 is fixedly connected to the T-shaped block 62. The external tooth insert 24 is fixedly connected to the connecting block 61. When the power mechanism 80 drives the inclined pusher slider 70 to move, the inclined surface guides the T-shaped block 62, connecting block 61, and external tooth insert 24 to slide along the shaft insert 23 through the cooperation of the T-shaped groove 72 and the T-shaped block 62, thereby adjusting the mold cavity width. The preferred inclination angle of the inclined surface is between 5° and 20°. This is not a specified angle and can be adjusted according to the actual application. The tilt angle is adjusted to increase or decrease; this balances power transmission efficiency and structural stability, ensuring that the driving force of the inclined push slider 70 is efficiently converted into the up-and-down movement of the external tooth insert 24, while avoiding jamming during movement; the connecting block 61, T-block 62, and external tooth insert 24 are all provided with through shaft core holes, wherein the external tooth insert 24 is in a sealed sliding fit with the shaft core insert 23 through the shaft core hole, and the connecting block 61 and T-block 62 are in a clearance fit with the shaft core insert 23 through the shaft core hole; a through first flat elongated hole 73 is provided on the inclined push slider 70 at the position between the two limiting slide bars 71, the width of the first flat elongated hole 73 matches the diameter of the shaft core insert 23, and the width of the first flat elongated hole 73 is smaller than the width of the T-block 62, and the inclined push slider 70 is in a clearance fit with the shaft core insert 23 through the first flat elongated hole 73. The shaft core holes in the connecting block 61, T-block 62, and external tooth insert 24 allow for a sealed sliding fit between the external tooth insert 24 and the shaft core insert 23, ensuring mold cavity sealing and preventing plastic leakage during injection. The connecting block 61 and T-block 62 also provide a clearance fit with the shaft core insert 23 to avoid interference with sliding movements. The first flat elongated hole 73 on the inclined push slider 70 not only provides a clearance fit with the shaft core insert 23 but also prevents the T-block 62 from disengaging from the T-groove 72 through width limitation, while simultaneously adapting to the dimensions of the shaft core insert 23 to ensure structural compatibility. The core function of this design is to optimize the transmission stability and accuracy of the inclined ejector component 60 and the inclined push slider 70, improve the smoothness and positioning accuracy of the external tooth insert 24's movement, ensure the accuracy of mold cavity width adjustment, and enhance the overall sealing and structural reliability of the mold.

[0030] Please see Figure 2-3The power mechanism 80 includes a motor base 81 fixedly installed on the side of the lower mold body 20, a servo motor 82 installed on the motor base 81, a lead screw body 83 powered by the servo motor 82, and a lead screw slider 84 threadedly connected to the lead screw body 83. The oblique push slider 70 has a receiving hole 85 on its side for accommodating the lead screw body 83, and the lead screw slider 84 is fixed at the opening of the receiving hole 85. In the above technical solution, the power mechanism 80 consists of a motor base 81, a servo motor 82, and a lead screw body. The power mechanism 80 consists of a servo motor 83 and a lead screw and slider 84. A motor mount 81 is fixedly installed on the side of the lower mold body 20, providing stable support for the entire power mechanism 80. A servo motor 82 is mounted on the motor mount 81 as the power output source. The lead screw body 83 is powered by the servo motor 82. The lead screw and slider 84 are threadedly engaged with the lead screw body 83. A receiving hole 85 is opened on the side of the inclined push slider 70 to accommodate the lead screw body 83. The lead screw and slider 84 are fixed at the opening of the receiving hole 85, achieving a fixed connection with the inclined push slider 70. Its working principle is that after the servo motor 82 starts, it outputs power, driving the lead screw body 83 to rotate. Utilizing the threaded transmission between the lead screw body 83 and the lead screw and slider 84, the rotational motion of the servo motor 82 is converted into the linear motion of the lead screw and slider 84, which in turn drives the inclined push slider 70, which is fixedly connected to it, to slide smoothly along the side-through receiving groove 21, providing precise driving force for the inclined ejector component 60, realizing the up-and-down movement of the external tooth insert 24 and the adjustment of the mold cavity width. Therefore, by cooperating with the servo motor 82 and the lead screw drive, the movement of the inclined push slider 70 is precisely controllable, improving the accuracy of mold cavity width adjustment and ensuring the molding consistency of synchronous wheels of different widths. At the same time, the fixed installation of the motor base 81 enhances the stability of the power mechanism 80, and the design of the receiving hole 85 allows the lead screw body 83 and the inclined push slider 70 to be reasonably matched, avoiding structural interference. The smoothness of the lead screw drive can also reduce shaking and jamming during power transmission, further optimizing the operational stability and service life of the mold, and adapting to the needs of large-scale, high-precision synchronous wheel injection molding production.

[0031] Please see Figure 2-3The injection system 30 includes an injection port 31 embedded in the upper part of the upper mold body 10, a runner 32 disposed inside the upper mold body 10, and multiple injection channels 33 disposed on the upper mold core 40. The injection port 31, the runner 32, and the injection channels 33 are sequentially sealed and connected, and the multiple injection channels 33 axially surround the upper end of the mold cavity. In the above technical solution, during the injection molding operation, molten plastic is injected from the injection port 31 and enters the runner 32 through the injection port 31. The runner 32 evenly distributes the molten plastic to the multiple injection channels 33, and then, through the multiple injection channels 33 axially surrounding the upper end of the mold cavity, the plastic is injected into the mold cavity synchronously and evenly, ensuring that the plastic quickly fills the entire mold cavity. Therefore, this technical solution can achieve uniform flow and stable injection of plastic. Multiple surrounding injection channels 33 can avoid problems such as excessive local flow rate and uneven filling during plastic filling, and prevent defects such as material shortage, air bubbles, and shrinkage cavities in the synchronous gear plastic teeth. The sealed connection between the injection port 31, the branch channel 32 and the injection channel 33 can prevent leakage of molten plastic and ensure the sealing of the injection molding process. At the same time, the surrounding layout is adapted to the mold cavity structure and the filling requirements of the mold cavity after different width adjustments, further improving the molding accuracy and surface quality of the synchronous gear plastic teeth, ensuring uniform bonding between plastic and metal components, optimizing product consistency, and adapting to large-scale injection molding production.

[0032] Please see Figure 2-5The lower mold body 20 includes a lower mold plate 201 and a slide plate 202 fixedly installed at the lower end of the lower mold plate 201. A side passage accommodating slide groove 21 is provided between the lower mold plate 201 and the slide plate 202, allowing the inclined push slider 70 to slide on the slide plate 202. The lower mold core 50 is embedded in the lower mold plate 201, and a connecting part 22 is opened on the lower mold plate 201. The shaft core insert 23 is fixedly connected to the slide plate 202. The lower mold body 20 also includes two square plates 203 fixedly installed at the lower end of the slide plate 202, an ejection mechanism disposed between the two square plates 203, and a base plate 204 fixedly installed at the lower end of the square plates 203. The ejection mechanism includes an ejection plate 205 located between the two square plates 203 and multiple ejector pins 206 fixedly connected to the ejection plate 205. The multiple ejector pins 206 are arranged to surround the shaft core insert 23. Each inclined pusher component 60 has a clearance through hole corresponding to the ejector pin 206, and the ejector pin 206 and the clearance through hole on the external tooth insert 24 are in a sealed sliding fit. The inclined pusher slider 70 has a second flat elongated hole 74 corresponding to the ejector pin 206. The ejector pin 206 is in a clearance fit with the inclined pusher slider 70 through the second flat elongated hole 74. The first flat elongated hole 73 and the second flat elongated hole 74 can be combined with each other, so as to achieve a clearance fit between the inclined pusher slider 70, the shaft insert 23 and the ejector pin 206. In order to improve the tightness of the fit between the inclined pusher component 60 and the ejector pin 206, both the connecting block 61 and the T-shaped block 62 have threaded through holes. The connecting block 61 and the T-shaped block 62 are threadedly connected to the external threaded sleeve 63 through the threaded through holes. The connecting block 61 and the T-shaped block 62 are fixedly fitted by the external threaded sleeve 63. The inner side of the external threaded sleeve 63 serves as a clearance through hole for the ejector pin 206 to make clearance fit.

[0033] In the above technical solution, the lower mold body 20 consists of a lower template 201, a slide plate 202, two square plates 203, an ejection mechanism, and a base plate 204. The lower template 201 is fixedly connected to the slide plate 202, and a side-through accommodating slide groove 21 is provided between them to provide stable guiding sliding support for the inclined push slider 70, ensuring smooth movement of the inclined push slider 70. The lower mold core 50 is embedded in the lower template 201, the connecting part 22 is opened in the lower template 201, and the shaft insert 23 is fixed on the slide plate 202, realizing the reasonable assembly and positioning of each component and ensuring... Precise alignment of the mold cavity structure; two square plates 203 are fixed to the lower end of the slide plate 202 to provide installation support for the ejection mechanism, and the bottom plate 204 is fixed to the lower end of the square plate 203 to enhance the overall structural strength of the lower mold body 20; the ejection plate 205 of the ejection mechanism is located between the two square plates 203, and multiple ejector pins 206 are fixed on the ejection plate 205 and arranged around the shaft insert 23. After injection molding, the ejection plate 205 drives the ejector pins 206 to move upward, realizing the assisted demolding of the synchronous wheel, improving demolding efficiency, and avoiding product damage caused by manual demolding. The clearance through holes on the external tooth insert 24 and the inclined ejector component 60 provide movement space for the ejector pin 206. The clearance through holes on the external tooth insert 24 and the ejector pin 206 are in a sealing sliding fit to ensure the sealing of the mold cavity. The second flat elongated hole 74 on the inclined push slider 70 is in a clearance fit with the ejector pin 206, and the first flat elongated hole 73 and the second flat elongated hole 74 can be combined to take into account the clearance requirements of the shaft insert 23 and the ejector pin 206, simplifying the structural design. Furthermore, the connecting block 61 and the T-block 62 are fitted with the external threaded sleeve 63 through the threaded through hole, which not only achieves a fixed fit between the two, but also uses the inner side of the external threaded sleeve 63 as a clearance through hole for the ejector pin 206, effectively improving the compactness of the fit between the inclined ejector component 60 and the ejector pin 206 and avoiding structural interference. This technical solution can optimize the overall structural stability and assembly rationality of the lower mold body 20, provide stable support for components such as the inclined push slider 70 and the shaft insert 23, achieve efficient and non-destructive demolding of the synchronous wheel through the ejection mechanism, and avoid component interference through the clearance structure design, improve the structural compactness and mold operation stability, and further ensure the injection molding efficiency and product quality of the synchronous wheel.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. An injection mold capable of injection molding synchronous wheels of different widths, comprising an upper mold body (10) and a lower mold body (20) that are mated together, the upper mold body (10) being provided with a glue injection system (30), an upper mold core (40) being provided at the lower end of the upper mold body (10) and mating with the glue injection system (30), and a lower mold core (50) being provided at the upper end of the lower mold body (20) and mating with the upper mold core (40); characterized in that, The lower mold body (20) has a side through-groove (21) on its side, and the upper end of the side through-groove (21) has a connecting part (22) that penetrates the upper end of the lower mold body (20); the lower mold core (50) has an internal tooth through hole (51) that penetrates the lower part, and the lower mold body (20) is also provided with a shaft insert (23) that is axially connected to the internal tooth through hole (51). The shaft insert (23) is slidably connected with an external tooth insert (24) that matches the internal tooth through hole (51). The external tooth insert (24) is connected along the connecting part (22) from the lower mold core (50) to the lower part. The mold cavity is formed between the upper mold core (40), the internal tooth through hole (51), the shaft core insert (23), and the external tooth insert (24). A sloping ejector (60) is also slidably connected to the shaft core insert (23). The sloping ejector (60) is fixedly connected to the lower end of the external tooth insert (24). A sloping pusher (70) is slidably connected to the side through accommodating slide groove (21). A power mechanism (80) for driving the sloping pusher (70) to move is provided on the side of the lower mold body (20). The sloping pusher (70) and the sloping ejector are in oblique contact with each other.

2. The injection mold capable of injection molding synchronous wheels of different widths according to claim 1, characterized in that, The mold cavity is used for injection molding of overmolded products. A top insert (41) is inlaid on the upper mold core (40) and abuts against the shaft insert (23). The top insert (41) and the external tooth insert (24) are also used to press the product to be overmolded on the shaft insert (23) together.

3. The injection mold capable of injection molding synchronous wheels of different widths according to claim 1, characterized in that, The inclined pusher component (60) includes a connecting block (61) and a T-shaped block (62). The upper end of the inclined pusher (70) has an inclined surface. Two limiting slides (71) are provided on the inclined surface of the inclined pusher (70). A T-shaped groove (72) is formed between the two limiting slides (71) and the inclined pusher (70). The T-shaped block (62) slides in conjunction with the T-shaped groove (72). The lower end of the connecting block (61) is an inclined surface that abuts against the upper end of the limiting slide (71). The connecting block (61) is fixedly connected to the T-shaped block (62). The external tooth insert (24) is fixedly connected to the connecting block (61).

4. The injection mold capable of injection molding synchronous wheels of different widths according to claim 3, characterized in that, The inclination angle of the inclined surface is 5°-20°.

5. An injection mold capable of injection molding synchronous wheels of different widths according to claim 3, characterized in that, The connecting block (61), T-block (62) and external tooth insert (24) are all provided with through shaft core holes. The external tooth insert (24) is in a sealed sliding fit with the shaft core insert (23) through the shaft core hole. The connecting block (61) and T-block (62) are in a clearance fit with the shaft core insert (23) through the shaft core hole. The inclined push slider (70) is provided with a through first flat elongated hole (73) at the position between the two limiting slide bars (71). The width of the first flat elongated hole (73) matches the diameter of the shaft core insert (23), and the width of the first flat elongated hole (73) is smaller than the width of the T-block (62). The inclined push slider (70) is in a clearance fit with the shaft core insert (23) through the first flat elongated hole (73).

6. The injection mold capable of injection molding synchronous wheels of different widths according to claim 1, characterized in that, The power mechanism (80) includes a motor mount (81) fixedly installed on the side of the lower mold body (20), a servo motor (82) mounted on the motor mount (81), a lead screw body (83) powered by the servo motor (82), and a lead screw slider (84) threadedly connected to the lead screw body (83). The side of the inclined push slider (70) is provided with a receiving hole (85) for accommodating the lead screw body (83), and the lead screw slider (84) is fixed at the opening position of the receiving hole (85).

7. An injection mold capable of injection molding synchronous wheels of different widths according to claim 1, characterized in that, The injection system (30) includes an injection port (31) embedded in the upper part of the upper mold body (10), a runner (32) inside the upper mold body (10), and multiple injection channels (33) on the upper mold core (40). The injection port (31), the runner (32) and the injection channels (33) are sealed and connected in sequence, and the multiple injection channels (33) are axially surrounded around the upper part of the mold cavity.

8. An injection mold capable of injection molding synchronous wheels of different widths according to claim 1, characterized in that, The lower mold body (20) includes a lower template (201) and a slide plate (202) fixedly installed at the lower end of the lower template (201). A side passage accommodating slide groove (21) is provided between the lower template (201) and the slide plate (202) so that the inclined push slider (70) can slide on the slide plate (202). The lower mold core (50) is embedded in the lower template (201), the connecting part (22) is opened on the lower template (201), and the shaft core insert (23) is fixedly connected to the slide plate (202).

9. An injection mold capable of injection molding synchronous wheels of different widths according to claim 8, characterized in that, The lower mold body (20) also includes two square plates (203) fixedly installed at the lower end of the slide plate (202), an ejection mechanism disposed between the two square plates (203), and a base plate (204) fixedly installed at the lower end of the square plates (203). The ejection mechanism includes an ejection plate (205) located between the two square plates (203) and multiple ejector pins (206) fixedly connected to the ejection plate (205). The multiple ejector pins (206) are configured to surround the surface. Around the shaft insert (23), the external tooth insert (24) and the inclined pusher (60) are provided with clearance through holes corresponding to the ejector pin (206), and the ejector pin (206) and the clearance through holes on the external tooth insert (24) are sealed and slidably engaged; the inclined pusher slide (70) is provided with a second flat elongated hole (74) corresponding to the ejector pin (206), and the ejector pin (206) is in clearance engagement with the inclined pusher slide (70) through the second flat elongated hole (74).

10. An injection mold capable of injection molding synchronous wheels of different widths according to claim 9, characterized in that, The inclined pusher component (60) includes a connecting block (61) and a T-shaped block (62). The upper end of the inclined pusher block (70) has an inclined surface, on which two limiting slides (71) are provided. A T-shaped groove (72) is formed between the two limiting slides (71) and the inclined pusher block (70). The T-shaped block (62) slides in conjunction with the T-shaped groove (72). The lower end of the connecting block (61) abuts against the inclined surface of the upper end of the limiting slide (71). The connecting block (61) and the T-shaped groove (72) slide in conjunction. The block (62) is fixedly connected, and the external tooth insert (24) is fixedly connected to the connecting block (61). Both the connecting block (61) and the T-block (62) are provided with threaded through holes. The connecting block (61) and the T-block (62) are threadedly connected to the external threaded sleeve (63) through the threaded through holes. The connecting block (61) and the T-block (62) are fixedly fitted through the external threaded sleeve (63). The inner side of the external threaded sleeve (63) serves as a clearance through hole for the ejector pin (206) to make room for the fitting.

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