WO2023060952A1

WO2023060952A1 - Actuator

Info

Publication number: WO2023060952A1
Application number: PCT/CN2022/104597
Authority: WO
Inventors: 何基中; 成彪
Original assignee: 科博达(重庆)智控技术有限公司
Priority date: 2021-10-11
Filing date: 2022-07-08
Publication date: 2023-04-20
Also published as: DE212022000093U1; CN113864509A

Abstract

An actuator, comprising an actuator housing (1), a PCBA board (2), a stator assembly (3), a rotor (4), a gear transmission assembly (5), and an output shaft (6). The actuator housing comprises a bottom housing (11) and an upper cover (12), the upper cover being connected to the bottom housing and defining an inner cavity (10) together with the bottom housing. The rotor is connected to the output shaft by means of the gear transmission assembly, so as to drive the output shaft to rotate. The gear transmission assembly comprises several gears, the several gears being arranged above the stator assembly. One end of a gear shaft (56) of each gear is fixed to a stator core (32) of the stator assembly, and the other end of the gear shaft of each gear is arranged on the upper cover in a penetrating manner. The gear shaft of a transmission gear train has high assembly precision and low working noise.

Description

Actuator

technical field

The invention relates to actuator technology.

Background technique

In new energy vehicles, the actuator is required to control the operating angle of the spool and precisely control the ratio of hot and cold water, thereby accurately controlling the temperature of the battery and prolonging the working efficiency and service life of the battery. The actuator includes an actuator housing, a PCBA board, a stator assembly, a rotor, a gear transmission assembly, and an output shaft.

The existing actuators mainly have the following deficiencies:

1. The gear shafts of each gear of the gear transmission assembly are installed on the plastic actuator housing. Due to the problems of cooling shrinkage and deformation in the plastic injection molding process, the manufacturing accuracy of the gear shaft holes set on the actuator housing is often not high. , thereby affecting the assembly accuracy of the gear shaft, which not only reduces the service life of the gear shaft, but also increases the working noise of the actuator;

2. The gears and the stator assembly of the gear transmission assembly of the existing actuator are arranged on the same plane. In order to ensure that the volume of the actuator is not too large, the stator assembly is made relatively small, which leads to a large air volume and reduces the actuator. airtight performance;

3. Due to the backlash of the gear in the existing actuator, and the size of the backlash varies with different temperatures, the output shaft of the actuator cannot precisely control the rotation angle of the spool, and thus cannot accurately control the ratio of hot and cold water control.

Contents of the invention

The technical problem to be solved by the present invention is to provide an actuator with high assembly precision of the gear shaft of the transmission gear set, low working noise and good air tightness.

A further technical problem to be solved by the present invention is to provide an actuator capable of precisely controlling the position of the output shaft.

An actuator according to an embodiment of the present invention includes an actuator housing, a PCBA board, a stator assembly, a rotor, a gear transmission assembly, and an output shaft; the actuator housing includes a bottom case and an upper cover, the upper cover is connected to the bottom case, and jointly defines An inner cavity; the stator assembly has an accommodation cavity, the rotor is at least partially accommodated in the accommodation cavity, and the rotor is connected to the output shaft through the gear transmission assembly to drive the output shaft to rotate; wherein, the PCBA board is arranged at the bottom of the inner cavity; the stator assembly is fixed Set on the bottom case and above the PCBA board, the stator assembly is electrically connected to the PCBA board; the gear transmission assembly includes several gears, several gears are arranged above the stator, and one end of the gear shaft of each gear is fixed to the stator assembly The other end of the gear shaft of each gear is passed through the upper cover.

The above-mentioned actuator includes an induction plate and an inductive position sensor, the induction plate is made of non-magnetic metal material; the induction plate is installed at the bottom end of the output shaft, and can rotate synchronously with the output shaft; the inductive position sensor Integrated on the PCBA board and facing the sensing board.

The present invention at least includes the following advantages:

1. In the embodiment of the present invention, one end of the gear shaft of the gear of the gear transmission assembly is arranged on the stator iron core of the stator assembly. Since the stator iron core is composed of silicon steel sheets, the manufacturing accuracy of the gear shaft hole can be ensured, thereby ensuring The assembly accuracy of the gear shaft prolongs the service life of the gear shaft and reduces the working noise of the actuator;

2. All the gears of the gear transmission assembly of the embodiment of the present invention are arranged above the stator assembly. Compared with the situation in the prior art that the gears of the gear transmission assembly and the stator assembly are arranged on the same plane, the volume of the actuator remains unchanged. In some cases, the stator assembly can be made larger, thereby reducing the air volume in the inner cavity of the actuator and improving the airtight performance of the actuator;

3. In the embodiment of the present invention, an induction plate is installed at the bottom of the output shaft. When the output shaft drives the induction plate to move, the inductive position sensor senses the change in the position of the output shaft, and can accurately obtain the angular position information of the output shaft. The control circuit according to The angular position information of the output shaft can precisely control the rotation of the output shaft to the required position;

4. Compared with the prior art, the structure of the actuator in the embodiment of the present invention is more compact.

Figure overview

The present invention will be further described below in conjunction with accompanying drawing.

Fig. 1 shows an exploded schematic diagram of an actuator according to an embodiment of the present invention.

Fig. 2 shows a schematic cross-sectional view of an actuator according to an embodiment of the present invention.

Fig. 3 shows a partially enlarged schematic diagram of a gear transmission assembly according to an embodiment of the present invention.

Fig. 4 shows an exploded schematic diagram of an output shaft, an induction plate and a PCBA board according to an embodiment of the present invention.

Fig. 5 shows a schematic top view of a stator assembly according to an embodiment of the present invention.

FIG. 6 shows a schematic cross-sectional view of C-C in FIG. 5 .

BEST MODE FOR CARRYING OUT THE INVENTION

See Figures 1 through 6. An actuator according to an embodiment of the present invention includes an actuator housing 1 , a PCBA board 2 , a stator assembly 3 , a rotor 4 , a gear transmission assembly 5 , an output shaft 6 , an induction plate 71 and an inductive position sensor 72 .

The actuator casing 1 includes a bottom case 11 and an upper cover 12 , the upper cover 12 and the bottom case 11 are sealed and connected by laser welding, and jointly define an inner cavity 10 .

The PCBA board 2 is arranged at the bottom of the inner chamber 10, and the PCBA board 2 is provided with a control circuit. In this embodiment, the PCBA board 2 is fixed to the bottom case 11 by heat riveting. In this embodiment, the PCBA board 2 is arranged at the bottom of the inner cavity 10, so that the area of the PCBA board 2 can be made larger.

The stator assembly 3 is fixedly arranged on the bottom case 11 and located above the PCBA board 2 , and the stator assembly 3 is electrically connected to the PCBA board 2 .

In this embodiment, the stator assembly 3 includes a three-phase winding 31 , a stator core 32 , a plastic frame 33 , a plastic insulating sheet 34 and four PIN pins 35 . The plastic frame 33 is molded on the outside of the stator core 32 , the three-phase winding 31 is wound around the plastic frame 33 , and the plastic frame 33 and the plastic insulating sheet 34 are integrally injection molded. The stator assembly 3 is electrically connected to the PCBA board 2 through four PIN pins 35 . One ends of the three PIN pins 35 are respectively connected to the three-phase winding 31 , and the other ends of the three PIN pins 35 are respectively welded and connected to the PCBA board 2 , and the three PIN pins 35 are kept insulated from the stator core 32 . One end of the remaining PIN pin 35 is connected to the stator core 32, and the other end of the remaining PIN pin 35 is connected to the ground of the PCBA board 2 to play the role of leading out the eddy current of the motor. In this embodiment, only the structures of the above four PIN pins 35 are described, and the stator assembly 3 also includes other conventional PIN pins, which will not be further described here.

The stator assembly 3 has an accommodating cavity 30 , and the rotor 4 is at least partially accommodated in the accommodating cavity 30 . The rotor 4 is sheathed outside the rotor shaft 44 and is in clearance fit with the rotor shaft 44 . In this embodiment, one end of the rotor shaft 44 is provided with knurling, and the other end of the rotor shaft 44 is an optical axis; one end of the rotor shaft 44 is fixed to the bottom shell 11 by insert injection molding, and the other end of the rotor shaft 44 is through Set on the upper cover 12. The connection between the rotor shaft 44 and the bottom shell 11 can be made more reliable by providing knurls on the surface of the end where the rotor shaft 44 is injection molded and connected to the bottom shell 11 .

The control circuit controls the stator assembly 3 to generate a working magnetic field, and the rotor 4 rotates under the action of the working magnetic field. The rotor 4 is connected with the output shaft 6 through the gear transmission assembly, so it can drive the output shaft 6 to rotate.

The gear transmission assembly 5 comprises several gears, and several gears are arranged on the top of the stator assembly 3, and one end of the gear shaft 56 of each gear is fixed on the stator core 32 of the stator assembly 3; the other end of the gear shaft 56 of each gear passes through 12 on the upper cover.

The above-mentioned "several" means "one or more". In this embodiment, the stator core 32 is provided with several first gear shaft holes 321 corresponding to the gear shafts 56 of several gears one by one, and each gear shaft 56 is interference fit with the corresponding first gear shaft holes 321, Thus, the gear shaft 56 is fixed on the stator core 32 . Since the stator core 32 is composed of silicon steel sheets, the manufacturing accuracy of the first gear shaft hole can be ensured, thereby ensuring the assembly accuracy of the gear shaft, prolonging the service life of the gear shaft, and reducing the working noise of the actuator. The upper cover 12 is provided with several second gear shaft holes 123 corresponding to the gear shafts 56 of several gears 51 one by one. 123 clearance fit. Each gear is sheathed outside the corresponding gear shaft 56 and is in clearance fit with the corresponding gear shaft.

In this embodiment, the gear transmission assembly 5 includes a first dual gear 51 , a second dual gear 52 and a third dual gear 53 . The rotor 4 is provided with an output gear 41, the output shaft 6 is provided with an input gear 62, the output gear 41 is a small gear, and the input gear 62 is a large gear. The output gear 41 meshes with the bull gear of the first duplex gear 51, the pinion of the first duplex gear 51 meshes with the bull gear of the second duplex gear 52, and the pinion of the second duplex gear 52 meshes with the third duplex gear. The large gear of the gear 53 meshes, and the pinion gear of the third double gear 53 meshes with the input gear 62 .

The stator assembly 3 is provided with a first output shaft hole 37 , the upper cover 12 is provided with a second output shaft hole 122 , and the bottom and top of the output shaft 6 pass through the first output shaft hole 37 and the second output shaft hole 122 respectively. A stop portion 61 is provided on the side of the output shaft 6 , and the stop portion 61 abuts against the stator assembly 3 . In this embodiment, the stop portion 61 is an annular step provided on the side of the output shaft 6 .

Further, the top cover 12 is provided with an annular side wall 124 around the second output shaft hole 122; the top of the output shaft 6 is sleeved with a sealing ring 8, and the sealing ring 8 is in sealing fit with the inner peripheral surface of the annular side wall 124, thereby The sealing between the output shaft 6 and the upper cover 12 is realized.

The induction plate 71 is installed on the bottom of the output shaft 6 and can rotate synchronously with the output shaft 6 . The inductive position sensor 72 is integrated on the PCBA board 2 and faces the sensing board 71 . The induction plate is made of a nonmagnetic metallic material such as stainless steel.

In this embodiment, the sensing plate 71 is circular, and a notch 710 is opened on a side of the sensing plate 71 . The bottom surface of the output shaft 6 is provided with a plurality of grooves 63, and the side of the induction plate 71 is provided with a plurality of outwardly protruding protrusions 73, and the plurality of protrusions 73 are respectively embedded in the plurality of grooves 63 in a one-to-one correspondence. . When the output shaft 6 drives the induction plate 71 to move, the coil of the inductive position sensor 72 senses the change in the position of the output shaft 6 and outputs a voltage signal, which can accurately obtain the angular position information of the output shaft 6. The control circuit on the PCBA board 2 is based on The angular position information of the output shaft 6 can accurately control the rotation angle of the motor (that is, the rotation angle of the rotor 4 ), and then precisely control the rotation of the output shaft 6 to a desired position.

Compared with the prior art, the actuator of the embodiment of the present invention has a more compact structure and can effectively reduce working noise.

Industrial applicability

According to the embodiment of the present invention, the gear shaft of the transmission gear set of the actuator has high assembly accuracy, and the actuator has low working noise.

Claims

An actuator, including an actuator housing, a PCBA board, a stator assembly, a rotor, a gear transmission assembly, and an output shaft; the actuator housing includes a bottom case and an upper cover, the upper cover is connected to the bottom case, and together An inner cavity is defined; the stator assembly has an accommodation cavity, the rotor is at least partially accommodated in the accommodation cavity, and the rotor is connected to the output shaft through the gear transmission assembly to drive the output shaft to rotate; It is characterized in that the PCBA board is arranged at the bottom of the inner cavity;

The stator assembly is fixedly arranged on the bottom case and located above the PCBA board, and the stator assembly is electrically connected to the PCBA board;

The gear transmission assembly includes several gears, the several gears are arranged above the stator assembly, one end of the gear shaft of each of the gears is fixed to the stator core of the stator assembly, and the gear of each of the gears The other end of the shaft passes through the upper cover.
The actuator according to claim 1, characterized in that the actuator comprises an induction plate and an inductive position sensor, and the induction plate is made of a non-magnetic metal material;

The induction plate is installed at the bottom of the output shaft and can rotate synchronously with the output shaft;

The inductive position sensor is integrated on the PCBA board and faces the induction board.
The actuator according to claim 2, characterized in that, the bottom surface of the output shaft is provided with a plurality of grooves, the side of the induction plate is provided with a plurality of outwardly protruding protrusions, and the plurality of The protrusions are respectively embedded in the plurality of grooves in a one-to-one correspondence.
The actuator according to claim 3, wherein a notch is opened on the side of the induction plate.
The actuator according to claim 1, wherein the stator core is provided with a plurality of gear shaft holes corresponding to the gear shafts of the plurality of gears one by one, each of the gear shafts and the corresponding gear shaft Hole interference fit.
The actuator according to claim 1 or 5, wherein the stator assembly includes a three-phase winding, a stator core, a plastic skeleton and a plastic insulating sheet; the plastic skeleton is overmolded outside the stator core, and the The three-phase winding is wound on the plastic skeleton, and the plastic skeleton and the plastic insulation sheet are integrally injection molded.
The actuator according to claim 6, wherein the stator assembly includes four PIN pins; one ends of the three PIN pins are respectively connected to the three-phase windings, and the other ends of the three PIN pins are respectively connected to the PCBA board and the three PIN pins are kept insulated from the stator core; one end of the remaining PIN pin is connected to the stator core, and the other end of the remaining PIN pin is connected to the ground of the PCBA board.
The actuator according to claim 1, wherein the stator assembly is provided with a first output shaft hole, the upper cover is provided with a second output shaft hole, and the bottom and top of the output shaft respectively pass through the The first shaft hole and the second shaft hole;

The side of the output shaft is provided with a stopper, and the stopper abuts against the stator assembly.
The actuator according to claim 8, wherein the top cover is provided with an annular side wall around the second output shaft hole;

A sealing ring is sheathed on the top of the output shaft, and the sealing ring is sealingly engaged with the inner peripheral surface of the annular side wall.
The actuator according to claim 1, wherein one end of the rotor shaft of the rotor is provided with knurling, and the other end of the rotor shaft is an optical axis; one end of the rotor shaft is molded by insert molding It is fixed on the bottom case, and the other end of the rotor shaft is passed through the upper cover.