Motor gear box mold exhaust mechanism

Abstract

The utility model provides an exhaust mechanism of a motor gear box die, and belongs to the technical field of motor manufacturing. The ejector pin hole and the exhaust hole are respectively arranged on the movable side insert and the core-pulling insert which are used for forming the gear cavity and the worm cavity of the motor gear box, the first communicating hole communicated with the ejector pin hole is arranged on the movable side insert, and the second communicating hole communicated with the exhaust hole is arranged on the core-pulling insert. One end of the exhaust hole extends to the position where the convex column is located, and an exhaust channel is formed through the exhaust hole, the second communicating hole, the first communicating hole and the ejector pin hole, so that gas at the position where the wall thickness of the area where the convex column is located is too large can be guided out during injection molding, the problems of air trapping, burning and insufficient filling are avoided, the product quality is higher, and the service life is longer; and the exhaust channel is an improvement of an original mold structure design, so that the problem of high cost caused by redevelopment of a mold is avoided, and popularization and application of the window lifting motor are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of motor manufacturing, in particular to an exhaust mechanism for a motor gearbox mould. Background Art

[0002] With the development of vehicle electronic control technology, electric windows are becoming more and more popular, and the utilization rate of window motors that automatically raise and lower electric windows is also gradually increasing.

[0003] At present, the existing window motors on the market usually come with a gearbox, such as the hand-electric integrated window motor disclosed in patent CN110594367A, which has a gearbox base, the gearbox base includes a gear cavity and a worm cavity, one side of the worm cavity is connected to the gear cavity, during installation, the motor is installed on the gearbox base and is located at one end of the worm cavity, the worm is rotatably installed in the worm cavity and one end is connected to the motor, at the same time, the gear assembly including the worm wheel is arranged in the gear cavity, and the turbine cooperates with the worm, so that the motor can drive the turbine to rotate through the worm, thereby realizing the rotation of the gear assembly and meeting the use requirements of the gear transmission. In addition, in order to facilitate the installation of the axial shock absorbing structure or the bearing structure, a convex column is usually provided on the bottom of the cavity in the worm cavity and on the side away from the motor installation. During manufacturing, since the design wall thickness of the thermoplastic is limited to 4 mm, the preferred range is between 0.76 and 3.2 mm. After the worm cavity of the above-mentioned gear box base is provided with a boss, the conventional height of the boss is 4 mm, which together with the bottom wall thickness of the worm cavity of the gear box base far exceeds the design wall thickness of the thermoplastic plastic. In addition, since the size of the worm cavity for installing the worm is small, it is easy to cause air entrapment and burns and insufficient filling problems mainly at the boss during the injection molding process, resulting in poor quality of the processed gear box base, affected structural strength, shortened service life, and not conducive to the promotion and use of window motors. Summary of the invention

[0004] In view of the above-mentioned problems existing in the prior art, the present invention aims to provide a motor gearbox mold exhaust mechanism, in which a gear cavity and a worm cavity are respectively formed during injection molding through the movable side insert and the core pulling insert of the mold, and an ejector hole is opened along the axial direction on the movable side insert, and an exhaust hole is opened on the core pulling insert. At the same time, a connecting hole connecting the ejector hole and the exhaust hole is opened at the matching surface of the movable side insert and the core pulling insert, so that the part where the boss is located during injection molding can be exhausted through the exhaust hole, the connecting hole and the ejector hole, thereby avoiding the problems of trapped air burns and insufficient filling at the position where the product wall thickness is too large, ensuring product quality, and at the same time, retaining the original mold structure design, with a short mold development cycle and low cost, which is conducive to the promotion and use of window motors.

[0005] The specific technical solutions are as follows:

[0006] An exhaust mechanism for a motor gearbox mold is disposed between the movable side insert and the core-pulling insert of the mold. During injection molding, the movable side insert and the core-pulling insert respectively form the gear cavity and the worm cavity of the motor gearbox. And a notch is provided along the tangent on one side of the movable side insert. One side of one end of the core-pulling insert is embedded into the notch. It has the following characteristics: a thimble hole is provided along the axial direction on the movable side insert, and one end of the thimble hole extends to the notch. The inner wall of the notch is the insert mating surface, and a first communication hole communicating with the thimble hole is provided on the insert mating surface. An exhaust hole is provided along the axial direction on the core-pulling insert and near one end of the convex column. A second communication hole communicating with the exhaust hole is provided on the core-pulling insert. And when one side of one end of the core-pulling insert is embedded into the notch, the first communication hole and the second communication hole are communicated, and the exhaust hole, the second communication hole, the first communication hole and the thimble hole form an exhaust passage.

[0007] The above-mentioned exhaust mechanism for a motor gearbox mold, wherein the core-pulling insert includes a first core-pulling insert and a second core-pulling insert. A concave cavity for mating with the convex column is provided on the end surface of one end of the first core-pulling insert. A protruding insertion column is provided on the end surface of the other end of the first core-pulling insert. One side of one end of the second core-pulling insert is embedded into the notch, and an insertion hole is provided along the axial direction on the end surface of the end of the second core-pulling insert embedded into the notch. The insertion column of the first core-pulling insert is inserted into the insertion hole of the second core-pulling insert.

[0008] The above-mentioned exhaust mechanism for a motor gearbox mold, wherein the exhaust hole penetrates through both ends along the axial direction of the first core-pulling insert. One end of the exhaust hole is communicated with the concave cavity, and the other end of the exhaust hole penetrates through the insertion column. The second communication hole is provided along the radial direction of the second core-pulling insert at one end of the second core-pulling insert provided with the insertion hole and is communicated with the insertion hole. And when the insertion column of the first core-pulling insert is inserted into the insertion hole of the second core-pulling insert, the exhaust hole and the insertion hole are communicated.

[0009] The above-mentioned exhaust mechanism for a motor gearbox mold, wherein the core-pulling insert further includes a check screw. A locking hole communicating with the insertion hole is provided along the radial direction at one end of the second core-pulling insert provided with the insertion hole. The check screw is installed in the locking hole and one end extends into the insertion hole. A bayonet is provided on the outer side wall of the insertion column of the first core-pulling insert. And when the insertion column is inserted into the insertion hole, one end of the check screw extending into the insertion hole extends into the bayonet.

[0010] The above-mentioned exhaust mechanism for a motor gearbox mold, wherein an exhaust inner insert is provided in the exhaust hole, and a gap is provided between the outer wall of one end of the exhaust inner insert close to the insertion column and the inner wall of the exhaust hole.

[0011] For the above-mentioned exhaust mechanism of the motor gearbox mold, one end of the exhaust hole passing through the insertion post has a flared orifice, one end of the exhaust inner insert is located within the flared portion of the exhaust hole, and the cross-section of the end of the exhaust inner insert located within the flared portion of the exhaust hole is larger than that of the other end.

[0012] For the above-mentioned exhaust mechanism of the motor gearbox mold, on one side of the end face of the end of the insertion post inserted into the insertion hole, there is a recessed avoidance step, and the recessed portion of the avoidance step communicates with the exhaust hole.

[0013] For the above-mentioned exhaust mechanism of the motor gearbox mold, the avoidance step and the bayonet are on the same side of the insertion post.

[0014] The positive effects of the above technical solutions are:

[0015] For the above-mentioned exhaust mechanism of the motor gearbox mold, by respectively axially opening a thimble hole and an exhaust hole on the movable side insert forming the gear cavity and the core-pulling insert forming the worm cavity during injection molding. At this time, one end of the exhaust hole of the core-pulling insert extends to the position where the convex post is located, and a communication hole connecting the thimble hole and the exhaust hole is opened at the mating surface of the movable side insert and the core-pulling insert. An exhaust passage is jointly formed by the exhaust hole, the communication hole, and the thimble hole, enabling the position where the convex post is located during injection molding to achieve mold exhaust through the formed exhaust passage, thereby avoiding the problems of air entrapment burns and insufficient filling that are prone to occur at the positions with excessive product wall thickness, ensuring product quality, extending service life, and at the same time, improving on the basis of the original mold structure design, without the need to completely re-develop the mold, with lower costs, which is conducive to the popularization and use of the window lifting motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a usage state diagram of the exhaust mechanism of the motor gearbox mold of the present utility model;

[0017] Figure 2 It is a structural diagram of an embodiment of the exhaust mechanism of the motor gearbox mold of the present utility model;

[0018] Figure 3 It is a structural diagram of the movable side insert of a preferred embodiment of the present utility model;

[0019] Figure 4 It is a cross-sectional view of the core-pulling insert of a preferred embodiment of the present utility model.

[0020] In the drawings: 1. Movable side insert; 11. Notch; 12. Thimble hole; 13. Fitting surface; 14. First communication hole; 2. Core-pulling insert; 21. First core-pulling insert; 22. Second core-pulling insert; 23. Set screw; 24. Exhaust inner insert; 211. Exhaust hole; 212. Concave cavity; 213. Insertion post; 214. Bayonet; 215. Avoidance step; 221. Insertion hole; 222. Second communication hole; 223. Locking hole; 3. Motor gearbox. Detailed implementation mode

[0021] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the following embodiments are combined with the attached Figure 1 to the attached Figure 4 to specifically elaborate on the technical solutions provided by the present utility model, but the following content shall not be construed as a limitation of the present utility model.

[0022] Figure 1 is a use state diagram of an exhaust mechanism of a motor gearbox mold of the present utility model; Figure 2 is a structural diagram of an embodiment of an exhaust mechanism of a motor gearbox mold of the present utility model. As Figure 1 and Figure 2 shown, the mold of the exhaust mechanism of the motor gearbox mold provided in this embodiment includes a movable side insert 1 and a core-pulling insert 2. At this time, a notch 11 is provided on one side of the movable side insert 1 along its tangent direction. When assembling the mold for injection molding, one side of one end of the core-pulling insert 2 is embedded into the notch 11, so that the movable side insert 1 can form a gear cavity of the motor gearbox 3, the core-pulling insert 2 can form a worm cavity, and the part of the core-pulling insert 2 embedded into the automatic notch 11 makes the gear cavity and the worm cavity communicate, facilitating the cooperation between the worm located in the worm cavity and the worm gear located in the gear cavity.

[0023] Figure 3 is a structural diagram of the movable side insert 1 of a preferred embodiment of the present utility model. As Figures 1 to 3As shown, a thimble hole 12 is axially formed on the movable side insert 1 to facilitate the demolding of the product. At this time, one end of the thimble hole 12 extends to the notch 11. And the inner wall of the notch 11 is set as the insert mating surface 13. At the same time, a first communication hole 14 communicating with the thimble hole 12 is formed on the insert mating surface 13, so that the gas discharged from the first communication hole 14 subsequently can be discharged through the thimble hole 12 without damaging the original structure of the mold, thereby reducing the cost of re-developing the mold. In addition, an exhaust hole 211 is axially formed on the core-pulling insert 2 at one end close to the convex column, so that the gas existing in the area where the convex column is located during the injection molding process can enter the exhaust hole 211. At the same time, a second communication hole 222 communicating with the exhaust hole 211 is formed on the core-pulling insert 2, so that the gas in the exhaust hole 211 can enter the second communication hole 222. And when one side of one end of the core-pulling insert 2 is embedded into the notch 11, the first communication hole 14 and the second communication hole 222 are communicated, that is, the communication between the exhaust hole 211 and the thimble hole 12 is realized. At this time, the exhaust hole 211, the second communication hole 222, the first communication hole 14 and the thimble hole 12 form an exhaust channel, that is, the gas appearing near the convex column during the injection molding process is discharged through the formed exhaust channel, thereby avoiding the problems of excessive wall thickness and easy occurrence of air entrapment burns and insufficient filling at this place due to the arrangement of the convex column, thus ensuring the quality of the processed product and extending the service life. In addition, the structures such as the movable side insert 1, the thimble hole 12, and the core-pulling insert 2 are designed as the mold structure used in the original injection molding, that is, an improvement on the basis of the original mold structure design, without completely re-developing the mold, with lower development cost, which is conducive to the popularization and use of the window lifting motor.

[0024] Figure 4 It is a cross-sectional view of the core-pulling insert 2 of a preferred embodiment of the present utility model. As Figure 1 , Figure 2 and Figure 4 shown, the core-pulling insert 2 of the mold further includes a first core-pulling insert 21 and a second core-pulling insert 22, that is, the core-pulling insert 2 is a combined structure with higher structural flexibility. At this time, a concave cavity 212 matching with the convex column is formed on the end surface of one end of the first core-pulling insert 21 to provide a mold cavity for the formation of the convex column. And a protruding insertion column 213 is provided on the end surface of the other end of the first core-pulling insert 21 to facilitate the subsequent connection with the second core-pulling insert 22 through the insertion column 213. In addition, one side of one end of the second core-pulling insert 22 is embedded into the notch 11, that is, during installation, the second core-pulling insert 22 is used in cooperation with the notch 11 of the movable side insert 1. In addition, an insertion hole 221 is axially formed on the end surface of the end of the second core-pulling insert 22 embedded into the notch 11. When assembling the mold, the insertion column 213 of the first core-pulling insert 21 is inserted into the insertion hole 221 of the second core-pulling insert 22, realizing the insertion connection between the first core-pulling insert 21 and the second core-pulling insert 22, and the assembly is convenient and fast.

[0025] More specifically, the exhaust hole 211 on the core-pulling insert 2 is arranged on the first core-pulling insert 21. At this time, the exhaust hole 211 penetrates through both ends along the axial direction of the first core-pulling insert 21, so that one end of the exhaust hole 211 communicates with the concave cavity 212, and the other end of the exhaust hole 211 penetrates through the insertion post 213, that is, the exhaust hole 211 penetrates through the first core-pulling insert 21, facilitating the flow of gas from one end of the first core-pulling insert 21 to the other end. In addition, the second communication hole 222 is arranged along the radial direction of the second core-pulling insert 22 at one end of the second core-pulling insert 22 provided with the insertion hole 221 and communicates with the insertion hole 221, that is, the second communication hole 222 forms a structure on the side wall of the second core-pulling insert 22 that communicates with the insertion hole 221, leading out the insertion hole 221 from the side of the second core-pulling insert 22, facilitating the subsequent connection of the insertion hole 221 with the first communication hole 14. And when the insertion post 213 of the first core-pulling insert 21 is inserted into the insertion hole 221 of the second core-pulling insert 22, the exhaust hole 211 and the insertion hole 221 are communicated, so that the gas at the position where the convex post is located during injection molding can enter the thimble hole 12 through the exhaust hole 211, the insertion hole 221, the second communication hole 222 and the first communication hole 14, so as to discharge the gas at this position and avoid problems such as air entrapment burn and insufficient filling.

[0026] More specifically, the core-pulling insert 2 further includes a stop screw 23. At this time, a locking hole 223 communicating with the insertion hole 221 is opened along the radial direction at one end of the second core-pulling insert 22 provided with the insertion hole 221. And the locking hole 223 is a threaded hole, and the stop screw 23 is installed in the locking hole 223 and one end extends into the insertion hole 221, and the length of the end of the stop screw 23 extending into the insertion hole 221 is adjusted by screwing the stop screw 23. In addition, a bayonet 214 is opened on the outer side wall of the insertion post 213 of the first core-pulling insert 21. During subsequent installation, when the insertion post 213 of the first core-pulling insert 21 is inserted into the insertion hole 221 of the second core-pulling insert 22, one end of the stop screw 23 extending into the insertion hole 221 can be inserted into the bayonet 214 by screwing the stop screw 23, restricting the insertion post 213 in the insertion hole 221, thereby preventing the problem that the first core-pulling insert 21 and the second core-pulling insert 22 are separated after installation, and the structural design is more reasonable.

[0027] More specifically, an exhaust inner insert 24 is further arranged in the exhaust hole 211. The exhaust inner insert 24 is used as the exhaust structure of the mold. At this time, a gap is provided between the outer wall of one end of the exhaust inner insert 24 close to the insertion post 213 and the inner wall of the exhaust hole 211. Preferably, the gap between the outer wall of the end of the exhaust inner insert 24 away from the insertion post 213 and the inner wall of the exhaust hole 211 is smaller than the flash value of the material used for injection molding, which can avoid the generation of burrs while meeting the exhaust requirement, ensure smooth exhaust and improve the product quality.

[0028] More specifically, the orifice of the exhaust hole 211 passing through one end of the insertion post 213 is arranged with a flared opening, which expands the outlet of the exhaust port and maintains smooth exhaust. At the same time, a limiting step is formed at the outlet end of the exhaust hole 211 through the flared opening. In addition, during installation, one end of the exhaust insert 24 is located within the flared opening of the exhaust hole 211, and the cross-section of the end of the exhaust insert 24 located within the flared opening of the exhaust hole 211 is larger than that of the other end, so that a stepped structure can also be formed at the end of the exhaust insert 24, thereby realizing the mating installation with the exhaust hole 211 and also avoiding the problem that the exhaust insert 24 comes out of the exhaust hole 211 under normal circumstances, improving the structural installation stability.

[0029] More specifically, a recessed avoidance step 215 is provided on one side of the end face of the end of the insertion post 213 inserted into the insertion hole 221, so that the height of the avoidance step 215 is lower than the height of the end face of the insertion post 213, thereby forming an avoidance opening on one side of the insertion post 213, and the recessed part of the avoidance step 215 communicates with the exhaust hole 211, that is, the recessed part caused by the arrangement of the avoidance step 215 communicates with the exhaust hole 211, so that even if the end of the insertion post 213 abuts against the bottom of the insertion hole 221, the communication between the exhaust hole 211 and the insertion hole 221 can still be maintained, and the structural design is more reasonable.

[0030] More specifically, the avoidance step 215 and the bayonet 214 are arranged on the same side of the insertion post 213, so that the operator can judge the position of the avoidance step 215 through the position of the bayonet 214, so as to ensure that after the first core-pulling insert 21 and the second core-pulling insert 22 are installed in place, the avoidance step 215 can also face the side of the second communication hole 222, ensuring the smoothness of the gas path and making the structural design more reasonable.

[0031] The exhaust mechanism of the motor gearbox mold provided in this embodiment includes a thimble hole 12, a first communication hole 14, a second communication hole 222, and an exhaust hole 211. By respectively arranging a thimble hole 12 and an exhaust hole 211 on the movable-side insert 1 and the core-pulling insert 2 of the mold for forming the gear cavity and the worm cavity of the motor gearbox 3, and a notch 11 is formed on one side of the movable-side insert 1. One end of the core-pulling insert 2 provided with the exhaust hole 211 is embedded into the notch 11, and a first communication hole 14 connecting the thimble hole 12 is formed in the notch 11 of the movable-side insert 1. At the same time, a second communication hole 222 connecting the exhaust hole 211 is formed on the core-pulling insert 2, and one end of the exhaust hole 211 extends to the position where the convex column is located. An exhaust channel is formed through the exhaust hole 211, the second communication hole 222, the first communication hole 14, and the thimble hole 12, which can discharge the gas at the area with too large wall thickness where the convex column is located during injection molding, avoiding problems such as easy air entrapment burns and insufficient filling. The product quality is higher, the service life is longer, and the exhaust channel is an improvement of the original mold structure design, avoiding the problem of high cost caused by re-developing the mold, which is beneficial to the popularization and use of the window lifter motor.

[0032] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be able to realize that all the equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor gearbox mold exhaust mechanism, arranged between a movable side insert and a core-pulling insert of the mold, during injection molding, the movable side insert and the core-pulling insert respectively form a gear cavity and a worm cavity of the motor gearbox, and a notch is provided on one side of the movable side insert along its tangent, and one side of one end of the core-pulling insert is embedded in the notch, characterized in that: A pin hole is provided on the movable side insert along its axial direction, and one end of the pin hole extends to the notch, the inner wall of the notch is the insert mating surface, and a first connecting hole connected to the pin hole is provided on the insert mating surface, an exhaust hole is provided on the core-pulling insert and at one end located close to the boss along its axial direction, a second connecting hole connected to the exhaust hole is provided on the core-pulling insert, and when one side of one end of the core-pulling insert is embedded in the notch, the first connecting hole and the second connecting hole are connected, and the exhaust hole, the second connecting hole, the first connecting hole and the pin hole form an exhaust channel.

2. The motor gearbox mold exhaust mechanism according to claim 1, characterized in that: The core-pulling insert includes a first core-pulling insert and a second core-pulling insert. A concave cavity cooperating with the convex column is provided on the end surface of one end of the first core-pulling insert, and an extended plug-in column is provided on the end surface of the other end of the first core-pulling insert. One side of one end of the second core-pulling insert is embedded in the notch, and a plug-in hole is provided along its axial direction on the end surface of the end of the second core-pulling insert embedded in the notch, and the plug-in column of the first core-pulling insert is inserted into the plug-in hole of the second core-pulling insert.

3. The motor gearbox mold exhaust mechanism according to claim 2, characterized in that: The exhaust hole passes through both ends of the first core-pulling insert along the axial direction, one end of the exhaust hole is connected with the concave cavity, and the other end of the exhaust hole passes through the plug-in column. The second connecting hole is arranged on the end of the second core-pulling insert where the plug-in hole is arranged along the radial direction of the second core-pulling insert and is connected with the plug-in hole. When the plug-in column of the first core-pulling insert is inserted into the plug-in hole of the second core-pulling insert, the exhaust hole and the plug-in hole are connected.

4. The motor gearbox mold exhaust mechanism according to claim 2, characterized in that: The core-pulling insert also includes a set screw. The second core-pulling insert is provided with a locking hole connected to the plug-in hole along its radial direction at one end of the plug-in hole. The set screw is installed in the locking hole and one end extends into the plug-in hole. A bayonet is provided on the outer side wall of the plug-in column of the first core-pulling insert, and when the plug-in column is inserted into the plug-in hole, the end of the set screw extending into the plug-in hole extends into the bayonet.

5. The motor gearbox mold exhaust mechanism according to claim 3, characterized in that: An exhaust inner insert is arranged in the exhaust hole, and a gap is arranged between the outer wall of the exhaust inner insert at one end close to the plug-in column and the inner wall of the exhaust hole.

6. The motor gearbox mold exhaust mechanism according to claim 5, characterized in that: The exhaust hole passes through the hole at one end of the plug-in column and is arranged in a flared shape. One end of the exhaust inner insert is located in the flared opening of the exhaust hole, and the cross section of the end of the exhaust inner insert located in the flared opening of the exhaust hole is larger than the cross section of the other end.

7. The motor gearbox mold exhaust mechanism according to claim 4, characterized in that: A concave avoidance step is provided on one side of the end surface of one end of the plug-in column plugged into the plug-in hole, and the concave portion of the avoidance step is communicated with the exhaust hole.

8. The motor gearbox mold exhaust mechanism according to claim 7, characterized in that: The avoidance step and the bayonet are located on the same side of the plug-in column.

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