Motor assembly with gear reducer

Abstract

A motor assembly with a gear reducer comprises a shell, a driving gear, a second-stage gear, a third-stage gear, a fourth-stage gear and an output gear are sequentially arranged in a containing cavity of the shell from bottom to top, the shell is provided with a driving motor, the output end of the driving motor is connected with a vertical first shaft body, and the driving gear is fixedly connected to the first shaft body in a sleeved mode; the shell is further provided with a second shaft body and a third shaft body, the second shaft body is rotationally sleeved with the second-stage gear and the fourth-stage gear, and the third shaft body is rotationally sleeved with the third-stage gear; the shell is detachably connected with a middle partition plate in the transverse direction, a protruding supporting shaft base is arranged on the upper side of the middle partition plate, and the output gear is rotationally connected to the supporting shaft base in a sleeving mode. A large fluted disc of the second-stage gear is meshed with the driving gear, a small fluted disc of the second-stage gear is meshed with a large fluted disc of the third-stage gear, a small fluted disc of the third-stage gear is meshed with a large fluted disc of the fourth-stage gear, and a small fluted disc of the fourth-stage gear is meshed with the output gear. According to the scheme, the structural layout is compact, meanwhile, large torque of the output gear is ensured, and good practicability is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor reducers, and particularly relates to a motor assembly with a gear reducer. Background Art

[0002] In recent years, the new energy vehicle industry has developed rapidly. Compared with fuel vehicles, new energy vehicles are driven by power batteries, and power batteries have relatively high requirements for environmental temperature. Therefore, it is necessary to centrally manage the vehicle body energy through a thermal management system. The thermal management system generally controls the temperature of the power battery through a water circuit. Therefore, in the thermal management system, an actuator is required to control the on-off of the water circuit, and a water valve can play this role.

[0003] The driving mechanisms of ordinary water valves are all driven by a servo motor in cooperation with a planar gear train to drive the output shaft to rotate, and then the output shaft drives the water valve spool to realize the on-off control of the water valve. However, when a relatively large reduction ratio needs to be achieved by the planar gear train, the occupied space area is often relatively large, which cannot meet the customer's requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that in the prior art, the driving mechanism of an ordinary water valve adopts a planar gear train, and when a relatively large reduction ratio needs to be achieved by the planar gear train, the occupied space area is often relatively large and cannot meet the requirements.

[0005] To solve the above problems, the utility model provides a motor assembly with a gear reducer, including a housing. The housing has a receiving cavity with an upper opening. A driving gear, a secondary gear, a tertiary gear, a quaternary gear, and an output gear are sequentially arranged in the receiving cavity from bottom to top. The housing is provided with a driving motor below the driving gear. The output end of the driving motor is connected with a vertical first shaft body. The driving gear is fixedly sleeved on the first shaft body. The housing is further provided with a second shaft body and a third shaft body both along the vertical direction. The first shaft body, the second shaft body, and the third shaft body are staggered with each other in the horizontal direction. The secondary gear and the quaternary gear are respectively rotatably sleeved on the lower part and the upper part of the second shaft body. The tertiary gear is rotatably sleeved on the third shaft body.

[0006] The housing is detachably connected with a transverse middle partition plate. The middle partition plate is located between the output gear and the driving motor. The upper side of the middle partition plate is provided with a protruding support shaft seat, and the support shaft seat is staggered with respect to the quaternary gear in the horizontal direction. The output gear is rotatably sleeved on the support shaft seat.

[0007] The secondary gear, the tertiary gear, and the quaternary gear all have a large gear disc and a small gear disc. The large gear disc of the secondary gear meshes with the driving gear, and the small gear disc meshes with the large gear disc of the tertiary gear. The small gear disc of the tertiary gear meshes with the large gear disc of the quaternary gear. The small gear disc of the quaternary gear meshes with the output gear.

[0008] Compared with the prior art, the driving gear, the secondary gear, the tertiary gear, the quaternary gear and the output gear in the above solution are stacked in sequence from bottom to top, which greatly reduces the occupied space area compared with the planar gear train in the prior art. Moreover, since the first shaft body, the second shaft body and the third shaft body are staggered from each other, the secondary gear and the quaternary gear are respectively rotatably sleeved on the lower part and the upper part of the second shaft body, and the tertiary gear is rotatably sleeved on the third shaft body, making the structural layout of the secondary gear, the tertiary gear and the quaternary gear very compact, and the overall volume can also be kept very small. Also, the vertical positions of the output gear and the driving gear are approximately close, which can be better adapted and installed. At the same time, the rotational power of the driving gear is transmitted to the output gear through the multi-stage transmission of the secondary gear, the tertiary gear and the quaternary gear, ensuring a large torque of the output gear and having good practicability.

[0009] In an improved solution, a first circuit board is further provided in the accommodating cavity. The first circuit board is connected below the middle partition and above the driving motor. The driving motor is electrically connected to the first circuit board, so as to control the start / stop, speed, etc. of the driving motor through the first circuit board. And the first circuit board is fixedly connected through the middle partition, which is convenient for assembly.

[0010] In an improved solution, the driving motor is a brushless motor. The first shaft body is connected to the rotor of the brushless motor. The stator coil of the brushless motor is electrically connected to the first circuit board. The brushless motor has a compact structure, low noise and stable operation. And since the first circuit board is arranged adjacent to the brushless motor, multiple stator coils of the brushless motor can be conveniently electrically connected to the first circuit board, which is convenient for assembly and has a reasonable layout.

[0011] In an improved solution, the output gear is provided with a magnet. A second circuit board is further provided in the accommodating cavity. The second circuit board is connected above the middle partition and below the output gear. The second circuit board is provided with an avoidance hole for the support shaft seat to pass through. The second circuit board and the first circuit board are electrically connected to each other. The second circuit board is provided with a Hall sensor for sensing the magnet. The Hall sensor detects the rotation state of the output gear by sensing the magnet of the output gear, and then the second circuit board transmits the data to the first circuit board to feedback and adjust the output state of the driving motor. In addition, the first circuit board and the second circuit board are respectively connected below and above the middle partition, which is not only convenient for assembly, but also improves the space utilization rate through the stacking design. Without changing the planar size, the first circuit board plus the second circuit board can have a larger available area, that is, more electronic components can be installed.

[0012] In an improved solution, the output gear and the magnet are integrally injection molded, with stable connection and convenient processing.

[0013] In an improved solution, the first circuit board and the second circuit board are electrically connected through a socket, and the middle partition plate is provided with a wire passing hole vertically for the socket to pass through, facilitating assembly.

[0014] In an improved solution, the middle partition plate is located vertically between the second-stage gear and the fourth-stage gear and is arranged offset in the horizontal direction relative to the third-stage gear. The upper end of the first shaft body is rotatably connected to the middle partition plate, further making the layout of each part in the accommodation cavity more compact and reasonable, which is beneficial to reducing the volume of the housing.

[0015] In an improved solution, it further includes an upper cover. The upper cover is detachably connected to the upper side of the housing to close the accommodation cavity. A convex shaft is provided on the upper side of the output gear, and the upper cover is provided with a cover hole for the convex shaft to protrude, thereby closing the accommodation cavity through the upper cover.

[0016] In an improved solution, an oil seal ring is provided between the upper cover and the output gear. The oil seal ring is arranged around the cover hole to ensure the sealing performance between the upper cover and the output gear.

[0017] In an improved solution, a raised first boss is provided on the bottom wall of the accommodation cavity corresponding to the position of the second shaft body. The lower side of the second-stage gear abuts against the first boss to be supported, and the lower side of the fourth-stage gear abuts against the upper side of the second-stage gear to be supported; a raised second boss is provided on the bottom wall of the accommodation cavity corresponding to the position of the third shaft body. The lower side of the third-stage gear abuts against the second boss to be supported. Description of the Drawings

[0018] Figure 1 It is an overall schematic diagram of a motor assembly with a gear reducer;

[0019] Figure 2 It is a schematic diagram of a motor assembly with a gear reducer after removing the upper cover;

[0020] Figure 3 It is a schematic diagram of a motor assembly with a gear reducer after removing the housing Figure 1 ;

[0021] Figure 4 It is a schematic diagram of a motor assembly with a gear reducer after removing the housing Figure 2 ;

[0022] Figure 5 It is a top view schematic diagram of a motor assembly with a gear reducer after removing the upper cover;

[0023] Figure 6 It is along Figure 5Schematic cross-sectional view along the A-A section line in

[0024] Figure 7 For along Figure 5 Schematic cross-sectional view along the B-B section line in

[0025] Figure 8 For along Figure 5 Schematic cross-sectional view along the C-C section line in

[0026] Description of reference numerals

[0027] 1. Housing; 10. Accommodation cavity; 11. Middle partition; 111. Support shaft seat; 112. Wire passing hole; 12. First shaft body; 13. Second shaft body; 14. Third shaft body; 15. Upper cover; 151. Cover hole; 16. First boss; 17. Second boss; 2. Driving motor; 3. Driving gear; 4. Secondary gear; 5. Tertiary gear; 6. Quaternary gear; 7. Output gear; 71. Magnet; 72. Convex shaft; 72. Oil seal ring; 8. First circuit board; 81. Socket; 9. Second circuit board; 91. Hall sensor; 92. Avoidance hole. Detailed implementation manners

[0028] Those skilled in the art should understand that the following implementation manners are only used to explain the technical principle of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0029] In the description of the following embodiments, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0030] In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0031] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Please refer to Figures 1 - 8 , an electric motor assembly with a gear reducer provided by an embodiment of the present utility model includes a housing 1. The housing 1 has a receiving cavity 10 with an open upper end. Inside the receiving cavity 10, a driving gear 3, a secondary gear 4, a tertiary gear 5, a quaternary gear 6, and an output gear 7 are sequentially arranged from bottom to top. The housing 1 is provided with a driving motor 2 located below the driving gear 3. The output end of the driving motor 2 is connected to a vertical first shaft body 12. The driving gear 3 is fixedly sleeved on the first shaft body 12. The housing 1 is further provided with a second shaft body 13 and a third shaft body 14 both along the vertical direction. The first shaft body 12, the second shaft body 13, and the third shaft body 14 are staggered with each other in the horizontal direction. The secondary gear 4 and the quaternary gear 6 are respectively rotatably sleeved on the lower part and the upper part of the second shaft body 13, and the tertiary gear 5 is rotatably sleeved on the third shaft body 14;

[0033] The housing 1 is detachably connected with a transverse middle partition 11. The middle partition 11 is located between the output gear 7 and the driving motor 2. The upper side of the middle partition 11 is provided with a protruding support shaft seat 111, and the support shaft seat 111 is staggered with respect to the quaternary gear 6 in the horizontal direction. The output gear 7 is rotatably sleeved on the support shaft seat 111;

[0034] The secondary gear 4, the tertiary gear 5, and the quaternary gear 6 all have a large gear disc and a small gear disc. The large gear disc of the secondary gear 4 meshes with the driving gear 3, and the small gear disc meshes with the large gear disc of the tertiary gear 5. The small gear disc of the tertiary gear 5 meshes with the large gear disc of the quaternary gear 6, and the small gear disc of the quaternary gear 6 meshes with the output gear 7.

[0035] Through the above scheme, by stacking the driving gear 3, the secondary gear 4, the tertiary gear 5, the quaternary gear 6, and the output gear 7 in sequence from bottom to top, the occupied space area is greatly reduced compared with the prior art planar gear train. Moreover, since the first shaft body 12, the second shaft body 13, and the third shaft body 14 are staggered with each other, the secondary gear 4 and the quaternary gear 6 are respectively rotatably sleeved on the lower part and the upper part of the second shaft body 13, and the tertiary gear 5 is rotatably sleeved on the third shaft body 14, the structural layout of the secondary gear 4, the tertiary gear 5, and the quaternary gear 6 is very compact, and the overall volume can also be kept very small. And the total number of the secondary gear 4, the tertiary gear 5, and the quaternary gear 6 is three, that is, an odd number, so that the vertical positions of the output gear 7 and the driving gear 3 are approximately close, which can be better adapted for installation; and through the multi-stage transmission of the secondary gear 4, the tertiary gear 5, and the quaternary gear 6, the rotational power of the driving gear 3 is transmitted to the output gear 7, ensuring a relatively large torque of the output gear 7 and having good practicability.

[0036] Regarding the rotational socket connection of the second-stage gear 4 and the fourth-stage gear 6 relative to the second shaft body 13, or the rotational socket connection of the third-stage gear 5 relative to the third shaft body 14, it can be achieved by setting snap rings on the second shaft body 13 to axially fix the second-stage gear 4 and the fourth-stage gear 6 and allow circumferential rotation, and setting snap rings on the third shaft body 14 to axially fix the third-stage gear 56 and allow circumferential rotation, which belongs to the prior art. Or in this embodiment, as Figure 8 shown, a raised first boss 16 is provided on the bottom wall of the accommodation cavity 10 corresponding to the position of the second shaft body 13. The lower side of the second-stage gear 4 abuts against the first boss 16 and is thus supported, and the lower side of the fourth-stage gear 6 abuts against the upper side of the second-stage gear 4 and is thus supported; a raised second boss 17 is provided on the bottom wall of the accommodation cavity 10 corresponding to the position of the third shaft body 14. The lower side of the third-stage gear 5 abuts against the second boss 17 and is thus supported, making the assembly more convenient.

[0037] In this embodiment, a first circuit board 8 is further provided in the accommodation cavity 10. The first circuit board 8 is connected below the middle partition 11 and above the drive motor 2. The drive motor 2 is electrically connected to the first circuit board 8, so as to control the start / stop or rotation speed of the drive motor 2 through the first circuit board 8. The first circuit board 8 is fixedly connected through the middle partition 11, and the assembly is convenient.

[0038] In this embodiment, the drive motor 2 is a brushless motor. The first shaft body 12 is connected to the rotor of the brushless motor. The stator coil of the brushless motor is electrically connected to the first circuit board 8. The brushless motor has a compact structure, low noise, and stable operation. Moreover, since the first circuit board 8 is arranged adjacent to the brushless motor, multiple stator coils of the brushless motor can be conveniently electrically connected to the first circuit board 8, the assembly is convenient, and the layout is reasonable.

[0039] Further, a magnet 71 is provided in the middle of the lower side of the output gear 7. A second circuit board 9 is further provided in the accommodation cavity 10. The second circuit board 9 is connected above the middle partition 11 and below the output gear 7. The second circuit board 9 is provided with an avoidance hole 92 for the support shaft seat 111 to pass through. The second circuit board 9 and the first circuit board 8 are electrically connected to each other. The second circuit board 9 is provided with a Hall sensor 91 for sensing the magnet 71. The Hall sensor 91 detects the rotation state of the output gear 7 by sensing the magnet 71 of the output gear 7, and then the second circuit board 9 transmits the data to the first circuit board 8 to feedback and adjust the output state of the drive motor 2; in addition, the first circuit board 8 and the second circuit board 9 are respectively connected below and above the middle partition 11, which is not only convenient for assembly, but also improves the space utilization rate through the stacking design. Without changing the planar size, the first circuit board 8 plus the second circuit board 9 can have a larger available area, that is, more electronic components can be installed.

[0040] The output gear 7 and the magnet 71 are preferably integrally injection-molded, with stable connection and convenient processing.

[0041] In this embodiment, a vertical bolt is provided in the accommodation cavity 10 of the housing 1, and the middle partition 11 is fixed in the middle position in the height direction of the accommodation cavity 10 by the bolt; the first circuit board 8 and the second circuit board 9 are also fixed by bolts. Among them, the middle partition 11 is crimped to the upper side of the first circuit board 8, and at the same time, the middle partition 11 supports the lower side of the second circuit board 9, so as to ensure the stability of the first circuit board 8 and the second circuit board 9 in the accommodation cavity 10.

[0042] As Figure 4 shown, the first circuit board 8 and the second circuit board 9 are preferably electrically connected through a pin header 81. The middle partition 11 is provided with a wire passing hole 112 for the pin header 81 to pass through in the vertical direction, so as to facilitate assembly. Of course, the first circuit board 8 and the second circuit board 9 can also be connected by wires, and this is not limited.

[0043] In this embodiment, the middle partition 11 is located between the second-stage gear 4 and the fourth-stage gear 6 in the vertical direction and is staggered in the horizontal direction relative to the third-stage gear 5. The middle partition 11 is provided with a mounting hole for the upper end of the first shaft body 12 to be rotatably connected, so as to further make the layout of each part in the accommodation cavity 10 more compact and reasonable, which is beneficial to reducing the volume of the housing 1.

[0044] As Figure 1 shown, the upper side of the housing 1 is also provided with an upper cover 15. The upper cover 15 is detachably connected to the upper side of the housing 1 by means of snap connection or interference press-fitting to close the accommodation cavity 10. A convex shaft 72 is provided on the upper side of the output gear 7, and the upper cover 15 is provided with a cover hole 151 for the convex shaft 72 to extend out, so as to close the accommodation cavity 10 through the upper cover 15.

[0045] Furthermore, as Figure 2 and Figure 7 shown, an oil seal ring 73 is provided between the upper cover 15 and the output gear 7. The oil seal ring 73 is arranged around the cover hole 151 to ensure the sealing performance between the upper cover 15 and the output gear 7.

[0046] In addition, the "staggered setting" mentioned in this application means that there is a gap between each other and they do not interfere with each other.

[0047] It should be noted that in the description of the present application, the terms indicating the direction or positional relationship such as "inner" and "outer" are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. All directional indications (such as up, down, left, right, front, back, inner, outer) are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0048] In the description of the present application, the description referring to terms such as "one embodiment", "some embodiments", "in this embodiment", "specific example", or "some examples" means that the specific features, mechanisms, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0049] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electric motor assembly with a gear reducer, comprising a housing (1), the housing (1) having a receiving cavity (10) with an upper opening, characterized in that, Inside the accommodation cavity (10), there are successively arranged from bottom to top a driving gear (3), a secondary gear (4), a tertiary gear (5), a quaternary gear (6) and an output gear (7). The housing (1) is provided with a driving motor (2) located below the driving gear (3). The output end of the driving motor (2) is connected with a vertical first shaft body (12). The driving gear (3) is fixedly sleeved on the first shaft body (12). The housing (1) is further provided with a second shaft body (13) and a third shaft body (14) both along the vertical direction. The first shaft body (12), the second shaft body (13) and the third shaft body (14) are staggered with each other in the horizontal direction. The secondary gear (4) and the quaternary gear (6) are respectively rotatably sleeved on the lower part and the upper part of the second shaft body (13), and the tertiary gear (5) is rotatably sleeved on the third shaft body (14). The housing (1) is detachably connected with a middle partition plate (11) along the horizontal direction. The middle partition plate (11) is located between the output gear (7) and the driving motor (2). The upper side of the middle partition plate (11) is provided with a protruding support shaft seat (111), and the support shaft seat (111) is staggered with respect to the quaternary gear (6) in the horizontal direction. The output gear (7) is rotatably sleeved on the support shaft seat (111). The secondary gear (4), the tertiary gear (5) and the quaternary gear (6) all have a large gear disc and a small gear disc. The large gear disc of the secondary gear (4) meshes with the driving gear (3), and the small gear disc meshes with the large gear disc of the tertiary gear (5). The small gear disc of the tertiary gear (5) meshes with the large gear disc of the quaternary gear (6), and the small gear disc of the quaternary gear (6) meshes with the output gear (7).

2. The motor assembly with a gear reducer according to claim 1, characterized in that, Inside the accommodation cavity (10), there is also a first circuit board (8). The first circuit board (8) is connected below the middle partition plate (11) and above the driving motor (2). The driving motor (2) is electrically connected to the first circuit board (8).

3. The motor assembly with a gear reducer according to claim 2, wherein, The driving motor (2) is a brushless motor. The first shaft body (12) is connected to the rotor of the brushless motor, and the stator coil of the brushless motor is electrically connected to the first circuit board (8).

4. The motor assembly with a gear reducer according to claim 2 or 3, characterized in that The output gear (7) is provided with a magnet (71). Inside the accommodation cavity (10), there is also a second circuit board (9). The second circuit board (9) is connected above the middle partition plate (11) and below the output gear (7). The second circuit board (9) and the first circuit board (8) are electrically connected to each other. The second circuit board (9) is provided with a Hall sensor (91) for sensing the magnet (71).

5. The motor assembly with a gear reducer according to claim 4, characterized in that, The output gear (7) and the magnet (71) are integrally injection-molded.

6. The motor assembly with a gear reducer according to claim 4, characterized in that, The first circuit board (8) and the second circuit board (9) are electrically connected through a pin header (81). The middle partition plate (11) is vertically provided with a wire passing hole (112) for the pin header (81) to pass through.

7. The motor assembly with a gear reducer according to any one of claims 1-3, characterized in that, The middle partition plate (11) is vertically located between the secondary gear (4) and the quaternary gear (6) and is staggered with respect to the tertiary gear (5) in the horizontal direction. The upper end of the first shaft body (12) is rotatably connected to the middle partition plate (11).

8. The motor assembly with a gear reducer according to claim 1, characterized in that, It further includes an upper cover (15), the upper cover (15) is detachably connected to the upper side of the housing (1) to achieve the closing of the accommodation cavity (10), a convex shaft (72) is provided on the upper side of the output gear (7), and the upper cover (15) is provided with a cover hole (151) for the convex shaft (72) to protrude.

9. The motor assembly with a gear reducer according to claim 8, characterized in that, An oil seal ring (73) is provided between the upper cover (15) and the output gear (7), and the oil seal ring (73) is arranged around the cover hole (151).

10. The motor assembly with a gear reducer according to claim 1, characterized in that, A raised first boss (16) is provided on the bottom wall of the accommodation cavity (10) corresponding to the position of the second shaft body (13), and the lower side of the secondary gear (4) abuts against the first boss (16) to be supported, and the lower side of the fourth-stage gear (6) abuts against the upper side of the secondary gear (4) to be supported; a raised second boss (17) is provided on the bottom wall of the accommodation cavity (10) corresponding to the position of the third shaft body (14), and the lower side of the tertiary gear (5) abuts against the second boss (17) to be supported.

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