Open gearbox and micromotor using the same

Abstract

The invention discloses an open gear box and a micro motor using the gear box; belonging to the technical field of micro motors; the gear box comprises a front end cover fixedly connected to a micro motor housing, the front end cover is provided with a through hole through which a rotating shaft of a power supply motor extends, an upper end surface of the front end cover on one side of the through hole is detachably fixedly connected with a positioning plate through a positioning component, a mounting hole is provided on the positioning plate, a shaft seat corresponding to the mounting hole is integrally formed on the front end cover on the other side of the through hole, a rotating shaft is connected between the mounting hole and the shaft seat, a worm wheel is fixedly provided on the rotating shaft, and a worm part meshing with the worm wheel is integrally formed on the power output shaft of the motor; the invention aims to provide an open gear box with a compact structure, low cost and good heat dissipation effect and a micro motor using the gear box; used for various small household appliances.

Description

Technical Field

[0001] The present invention relates to a micro motor gear box, more specifically, to an open gear box and also to a micro motor using the gear box. Background Art

[0002] At present, the reduction motor with a single gear has two positioning plates to fix the worm gear, and the two positioning plates are fixed by the support on the front cover. In the actual application process, this structure is found to have the following disadvantages: First, due to the large size of the positioning plate, most of the heat dissipation holes are blocked, so that the airflow generated by the fan blade at the end of the motor power output shaft cannot be effectively sent to the heat dissipation holes, resulting in poor heat dissipation effect of the product. Second, the structure is relatively complex and the production cost is high.

[0003] In addition, there are currently two ways to connect the front cover and the shell of the micromotor. One is to extend connecting ears on the front and rear covers respectively, and use long screws to pass through the corresponding connecting ears on the front and rear covers to tighten. The other is to set a connecting seat on the shell on the side of the front cover, and then connect the connecting seat and the connecting ear with screws. In both of the above methods, the edge of the front cover needs to be extended with a connecting ear to achieve the fixation of the front cover and the shell. Since the edge of the front cover is designed with a connecting ear, its outer diameter is greatly enlarged. During installation, a larger installation chamber or an additional corresponding slot structure is required to accommodate the connecting ear part. Not only does it cause the motor size to increase, but it also increases the production cost. Summary of the invention

[0004] The first object of the present invention is to provide an open gear box with compact structure, low cost and good heat dissipation effect in view of the above-mentioned deficiencies in the prior art.

[0005] The latter object of the present invention is to provide a micro motor using the above gear box.

[0006] The previous technical solution of the present invention is implemented as follows: an open gear box, including a front end cover fixedly connected to the micromotor housing, the front end cover is provided with a through hole through which the power supply motor shaft extends, the upper end surface of the front end cover on one side of the through hole is detachably fixedly connected to a positioning plate through a positioning assembly, a mounting hole is provided on the positioning plate, and a shaft seat corresponding to the mounting hole is integrally formed on the front end cover on the other side of the through hole, a rotating shaft is connected between the mounting hole and the shaft seat, a worm wheel is fixedly provided on the rotating shaft, and a worm part meshing with the worm wheel is integrally formed on the motor power output shaft; a rotating joint connected to an external component to be driven is formed at one end of the rotating shaft.

[0007] In the above-mentioned open gearbox, the positioning assembly is composed of a support on the front end cover formed integrally and a convex block structure arranged on the front end cover outside the support, and an internal threaded blind hole is arranged at the upper end of the support;

[0008] The positioning plate consists of a supporting plate surface and a positioning ear plate integrally formed on the upper end of the supporting plate surface. A positioning hole corresponding to the internal threaded blind hole is arranged on the positioning ear plate. When the positioning ear plate is threadedly connected with the internal threaded blind hole and locked on the upper end surface of the support through screws, the lower end surface of the supporting plate surface is pressed against the positioning groove formed by the protrusion structure and the support.

[0009] In the above-mentioned open gear box, the protrusion structure is composed of a positioning protrusion arranged on the upper end surface of the front end cover on the side of the support and a positioning seat arranged on the upper end surface of the front end cover on the side of the positioning protrusion. A positioning groove for fixing the positioning plate is formed between the positioning protrusion and the support. The width of the positioning groove is adapted to the thickness of the positioning plate, and a positioning notch adapted to the thickness of the positioning plate is provided on the positioning seat; the positioning protrusion, the positioning seat and the positioning ear plate are arranged in a triangle and cooperate with each other to fix the positioning plate.

[0010] In the above-mentioned open gear box, a limiting protrusion is integrally formed on the upper end surface of the front end cover between the positioning protrusion and the positioning seat, and a limiting notch adapted to the limiting protrusion is provided at the lower end of the support plate surface. When the positioning ear plate is threadedly connected to the internal threaded blind hole and locked on the upper end surface of the support, the limiting protrusion is located in the limiting notch.

[0011] In the above-mentioned open gearbox, a fan blade is arranged at the free end of the motor power output shaft, and a plurality of heat dissipation holes are distributed along the circumferential direction on the front end cover outside the through hole.

[0012] In the above-mentioned open gearbox, a positioning ring is formed on the periphery of the end of the shaft seat inner hole opposite to the positioning plate, and a reinforcing rib connected to the positioning ring is integrally formed on the side of the shaft seat; an oil-containing bearing or a ball bearing is arranged in the shaft seat and the inner hole of the positioning ring.

[0013] In the above-mentioned open gearbox, the support is composed of a positioning column integrally formed on the front end cover and perpendicular to the front end cover, and a support plate integrally formed with the positioning column and perpendicular to the front end cover; the support plate surface and the support plate are arranged in close contact with each other.

[0014] After the present invention adopts the above structure, an axle seat is integrally formed on the front end cover, and a positioning plate is removably fixed by a positioning assembly on the front end cover. The worm gear is fixed by the positioning plate and the axle seat, so that the structure of the entire gear box becomes more concise and the assembly is more convenient. Compared with the original structure with two positioning plates, one positioning plate and its corresponding assembly process are saved, so that the assembly of the gear box saves half of the labor and assembly time compared with the original structure. In the field of micromotors where product profits are thinning and competition is increasingly fierce, this improvement has a significant economic effect. At the same time, the integrally formed axle seat structure leaves more space, and the airflow generated by the fan blades can effectively enter the fan through the heat dissipation holes for heat dissipation. While reducing costs, effective heat dissipation of the fan is achieved, which has unexpected effects.

[0015] The latter technical solution of the present invention is achieved as follows: a micromotor using the above-mentioned gearbox includes a shell and a front end cover arranged at the front end of the shell, at least one through hole is circumferentially arranged at the proximal end of one end of the shell close to the front end cover, a positioning ear piece matching the through hole is arranged in the shell, an internally threaded through hole is arranged on the positioning ear piece, a connecting hole corresponding to the internally threaded through hole is arranged on the front end cover, and a tightening gap is formed between the connecting hole and the internally threaded through hole; the front end cover and the shell are threadedly connected and fixed through the connecting hole and the internally threaded through hole by fastening screws.

[0016] In the above-mentioned micromotor, the positioning ear piece is composed of a positioning part adapted to the through hole and a connecting part integrally formed with the positioning part; the length of the connecting part is greater than that of the positioning part; and the internal thread through hole is formed in the connecting part.

[0017] In the above-mentioned micromotor, a thickened ring with internal threads is integrally formed on the positioning ear piece corresponding to the end of the internal thread through hole away from the front end cover.

[0018] After the present invention adopts the above structure, the original external connection structure of the front cover and the shell is designed to be an internal connection, so that the outer diameter of the micromotor is greatly reduced, which not only makes the product appearance beautiful, but also can adapt to the installation of more small household appliances due to the small outer diameter, and can further reduce the volume of small household appliances. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the embodiments in the accompanying drawings, but this does not constitute any limitation to the present invention.

[0020] Figure 1 It is a schematic structural diagram of the gearbox of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the front end cover of the present invention;

[0022] Figure 3It is a structural schematic diagram of the positioning plate of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the micromotor of the present invention;

[0024] Figure 5 It is a schematic diagram of the assembly structure of the front end cover and the housing of the present invention;

[0025] Figure 6 yes Figure 5 A local enlarged schematic diagram of the middle A;

[0026] Figure 7 It is a structural schematic diagram of the positioning ear piece of the present invention.

[0027] In the figure: In the figure: 1, front end cover; 1a, through hole; 1b, connecting hole; 1c, heat dissipation hole; 2, positioning assembly; 2a, internal threaded blind hole; 2b, positioning protrusion; 2c, positioning seat; 2d, positioning notch; 2e, limiting protrusion; 3, positioning plate; 3a, mounting hole; 3b, support plate surface; 3c, positioning ear plate; 3d, positioning hole; 3e, limiting notch; 4, shaft seat; 4a, positioning ring; 4b, reinforcing rib; 5, rotating shaft; 5a, worm gear; 5b, rotating joint; 6, fan blade; 7, outer shell; 7a, positioning through hole; 8, positioning ear; 8a, internal threaded through hole; 8b, positioning part; 8c, connecting part; 8d, thickening ring; 9, fastening screw; 10, support; 10a, positioning column; 10b, supporting plate. DETAILED DESCRIPTION

[0028] See also Figures 1 to 3 As shown, an open gearbox of the present invention comprises a front end cover 1 fixedly connected to the micromotor housing, the front end cover 1 is provided with a through hole 1a through which the power supply motor shaft extends, the upper end surface of the front end cover 1 on one side of the through hole 1a is detachably fixedly connected with a positioning plate 3 through a positioning assembly 2, the positioning plate 3 is provided with a mounting hole 3a, and a shaft seat 4 corresponding to the mounting hole 3a is integrally formed on the front end cover 1 on the other side of the through hole 1a, a rotating shaft 5 is connected between the mounting hole 3a and the shaft seat 4, a worm wheel 5a is fixedly provided on the rotating shaft 5, and a worm part meshing with the worm wheel 5a is integrally formed on the motor power output shaft; a rotating joint 5b connected to an external component to be driven is formed at one end of the rotating shaft 5.

[0029] Specifically, the positioning assembly 2 is composed of a support 2a on the front end cover 1 formed integrally and a convex block structure arranged on the front end cover 1 outside the support 2a, and an internal thread blind hole 2b is arranged at the upper end of the support 2a.

[0030] Correspondingly, the positioning plate 3 consists of a supporting plate surface 3b and a positioning ear plate 3c integrally formed on the upper end of the supporting plate surface 3b, and a positioning hole 3d corresponding to the internal threaded blind hole 2b is provided on the positioning ear plate 3c. When the positioning ear plate 3c is threadedly connected to the internal threaded blind hole and locked on the upper end surface of the support 2a by screws, the lower end surface of the supporting plate surface 3b is pressed against the positioning groove formed by the protrusion structure and the support 2a.

[0031] Preferably, the support 2a is composed of a positioning column 10a integrally formed on the front end cover 1 and perpendicular to the front end cover 1, and a support plate 10b integrally formed with the positioning column 10a and perpendicular to the front end cover 1; the support plate surface 3b and the support plate 10b are arranged closely to each other. The convex block structure is composed of a positioning convex block 2b arranged on the upper end surface of the front end cover 1 on the side of the support 2a, and a positioning seat 2c arranged on the upper end surface of the front end cover 1 on the side of the positioning convex block 2b. A positioning groove for fixing the positioning plate 3 is formed between the positioning convex block 2b and the support 2a. The width of the positioning groove is adapted to the thickness of the positioning plate 3. A positioning notch 2d adapted to the thickness of the positioning plate 3 is provided on the positioning seat 2c; the positioning convex block 2b, the positioning seat 2c and the positioning ear plate 3c are arranged in a triangular shape and cooperate with each other to fix the positioning plate 3.

[0032] Further preferably, in order to prevent the positioning plate from moving in the horizontal direction, a limiting protrusion 2e is integrally formed on the upper end surface of the front end cover between the positioning protrusion 2b and the positioning seat 2c, and a limiting notch 3e adapted to the limiting protrusion 2e is provided at the lower end of the support plate surface 3b. When the positioning ear plate 3c is threadedly connected to the internal threaded blind hole and locked on the upper end surface of the support 2a by screws, the limiting protrusion 2e is located in the limiting notch 3e.

[0033] At the same time, a fan blade 6 is arranged at the free end of the motor power output shaft, and a plurality of heat dissipation holes 1c are distributed circumferentially on the front end cover 1 outside the through hole 1a. The heat dissipation holes located between the shaft seat and the positioning plate can effectively send the wind generated by the fan blade into the micro motor for heat dissipation, which can effectively ensure the long-term stable operation of the micro motor.

[0034] Preferably, a positioning ring 4a is formed on the periphery of the end of the inner hole of the shaft seat 4 opposite to the positioning plate 3, and a reinforcing rib 4b connected to the positioning ring 4a is integrally formed on the side of the shaft seat 4; an oil-containing bearing or a ball bearing is arranged in the inner hole of the shaft seat 4 and the positioning ring 4a. The positioning ring has the function of extending the length of the inner hole of the shaft seat to facilitate the installation of the bearing and improve the stability, and secondly, it can cooperate with the reinforcing rib to strengthen the strength of the shaft seat.

[0035] See also Figures 4 to 7As shown, a micromotor of a gearbox of the present invention comprises a housing 7 and a front end cover 1 arranged at the front end of the housing 7, and at least one positioning through hole 7a is circumferentially arranged at a proximal end of the housing 7 close to the front end cover 1. In this embodiment, the number of positioning holes is two and they are symmetrically arranged. A positioning ear piece 8 matching with the positioning through hole 7a is arranged in the housing 7, and an internal threaded through hole 8a is arranged on the positioning ear piece 8. A connecting hole 1b corresponding to the internal threaded through hole 8a is arranged on the front end cover 1, and a tightening gap is formed between the connecting hole 1b and the internal threaded through hole 8a; the front end cover 1 and the housing 7 are threadedly connected and fixed by fastening screws 9 passing through the connecting hole 1b and the internal threaded through hole 8a.

[0036] Preferably, the positioning ear piece 8 is composed of a positioning portion 8b adapted to the positioning through hole 7a and a connecting portion 8c integrally formed with the positioning portion 8b; the length of the connecting portion 8c is greater than the length of the positioning portion 8b; the internal threaded through hole 8a is formed in the connecting portion 8c. The length of the connecting portion is greater than the length of the first portion, which can effectively prevent the positioning ear piece from swinging in the positioning through hole, and can also play a limiting role, so that the width of the positioning portion is adapted to the thickness of the shell, that is, adapted to the width of the positioning through hole, so as to avoid the free end of the positioning portion being exposed outside the shell, thereby ensuring the compactness of the structure.

[0037] Further preferably, a thickening ring 8d with internal threads is integrally formed on the positioning ear piece 8 corresponding to the end of the internal threaded through hole 8a away from the front end cover 1. The thickening ring can effectively increase the depth of the internal threaded through hole to ensure the stability of its connection with the fastening thread.

[0038] When assembling, insert the positioning part into the positioning through hole and fix it with strong magnetic adsorption, and then you can assemble it easily. The assembly is very convenient and quick.

[0039] The above embodiments are preferred implementation modes of the present invention and are only used to facilitate the description of the present invention. They are not intended to limit the present invention in any form. Any person with ordinary knowledge in the relevant technical field, if they do not depart from the scope of the technical features of the present invention, can make equivalent embodiments by partial changes or modifications to the technical contents disclosed in the present invention, and they still fall within the scope of the technical features of the present invention without departing from the technical features of the present invention.

Claims

1. A micromotor using an open gearbox, comprising a housing (7) and a front end cover (1) arranged at the front end of the housing (7), characterized in that: At least one positioning through hole (7a) is circumferentially arranged at a proximal end of one end of the housing (7) close to the front end cover (1); a positioning ear piece (8) matching the positioning through hole (7a) is arranged in the housing (7); an internal threaded through hole (8a) is arranged on the positioning ear piece (8); a connecting hole (1b) corresponding to the internal threaded through hole (8a) is arranged on the front end cover (1); a tightening gap is formed between the connecting hole (1b) and the internal threaded through hole (8a); the front end cover (1) and the housing (7) are threadedly connected and fixed by a fastening screw (9) penetrating the connecting hole (1b) and the internal threaded through hole (8a); A through hole (1a) is provided on the front end cover (1) through which the rotating shaft of the power supply machine extends. The upper end surface of the front end cover (1) on one side of the through hole (1a) is detachably fixedly connected to a positioning plate (3) via a positioning assembly (2). A mounting hole (3a) is provided on the positioning plate (3). A shaft seat (4) corresponding to the mounting hole (3a) is integrally formed on the front end cover (1) on the other side of the through hole (1a). A rotating shaft (5) is connected between the mounting hole (3a) and the shaft seat (4). A worm gear (5a) is fixedly provided on the rotating shaft (5). A worm part meshing with the worm gear (5a) is integrally formed on the power output shaft of the motor. A rotary joint (5b) connected to an external component to be driven is formed on one end of the rotating shaft (5). A positioning ring (4a) is formed on the periphery of the end of the inner hole of the shaft seat (4) opposite to the positioning plate (3), and a reinforcing rib (4b) connected to the positioning ring (4a) is integrally formed on the side of the shaft seat (4); an oil-containing bearing or a ball bearing is arranged in the inner hole of the shaft seat (4) and the positioning ring (4a); A fan blade (6) is arranged at the free end of the motor power output shaft, and a plurality of heat dissipation holes (1c) are distributed along the circumferential direction on the front end cover (1) outside the through hole (1a).

2. A micromotor using an open gearbox according to claim 1, characterized in that: The positioning ear piece (8) is composed of a positioning portion (8b) adapted to the positioning through hole (7a) and a connecting portion (8c) integrally formed with the positioning portion (8b); the length of the connecting portion (8c) is greater than the length of the positioning portion (8b); and the internal thread through hole (8a) is formed in the connecting portion (8c).

3. A micromotor using an open gearbox according to claim 1 or 2, characterized in that: A thickened ring (8d) with an internal thread is integrally formed on the positioning ear piece (8) corresponding to the end of the internal thread through hole (8a) away from the front end cover (1).

4. The micromotor using an open gearbox according to claim 1, characterized in that: The positioning assembly (2) is composed of a support (10) on an integrally formed front end cover (1) and a convex block structure arranged on the front end cover (1) outside the support (10), and an internal threaded blind hole (2a) is arranged at the upper end of the support (10); The positioning plate (3) comprises a support plate surface (3b) and a positioning ear plate (3c) integrally formed on the upper end of the support plate surface (3b); a positioning hole (3d) corresponding to the internal thread blind hole (2a) is provided on the positioning ear plate (3c); when the positioning ear plate (3c) is threadedly connected to the internal thread blind hole and locked on the upper end surface of the support (10) by means of screws, the lower end surface of the support plate surface (3b) is pressed against the positioning groove formed by the protruding block structure and the support (10).

5. The micromotor using an open gearbox according to claim 4, characterized in that: The convex block structure comprises a positioning convex block (2b) arranged on the upper end surface of the front end cover (1) on the side of the support (10) and a positioning seat (2c) arranged on the upper end surface of the front end cover (1) on the side of the positioning convex block (2b); a positioning groove for fixing the positioning plate (3) is formed between the positioning convex block (2b) and the support (10); the width of the positioning groove is adapted to the thickness of the positioning plate (3); and a positioning notch (2d) adapted to the thickness of the positioning plate (3) is provided on the positioning seat (2c); the positioning convex block (2b), the positioning seat (2c) and the positioning ear plate (3c) are arranged in a triangular shape and cooperate with each other to fix the positioning plate (3).

6. The micromotor using an open gearbox according to claim 4, characterized in that: A limiting protrusion (2e) is integrally formed on the upper end surface of the front end cover between the positioning protrusion (2b) and the positioning seat (2c), and a limiting notch (3e) adapted to the limiting protrusion (2e) is provided at the lower end of the support plate surface (3b); when the positioning ear plate (3c) is threadedly connected to the internal thread blind hole and locked on the upper end surface of the support (10) by means of screws, the limiting protrusion (2e) is located in the limiting notch (3e).

7. The micromotor using an open gearbox according to claim 4, characterized in that: The support (10) is composed of a positioning column (10a) integrally formed on the front end cover (1) and perpendicular to the front end cover (1), and a support plate (10b) integrally formed with the positioning column (10a) and perpendicular to the front end cover (1); the support plate surface (3b) and the support plate (10b) are arranged in close contact with each other.

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