CN113864509A

CN113864509A - Actuator

Info

Publication number: CN113864509A
Application number: CN202111184055.9A
Authority: CN
Inventors: 何基中; 成彪
Original assignee: Keboda Chongqing Intelligent Control Technology Co ltd
Current assignee: Keboda Chongqing Intelligent Control Technology Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2021-12-31
Also published as: DE212022000093U1; WO2023060952A1

Abstract

An actuator comprises an actuator shell, a PCBA board, a stator assembly, a rotor, a gear transmission assembly and an output shaft; the actuator shell comprises a bottom shell and an upper cover, and the upper cover is connected with the bottom shell and jointly defines an inner cavity; the stator component is provided with an accommodating cavity, the rotor is at least partially accommodated in the accommodating cavity, and the rotor is connected with the output shaft through the gear transmission component so as to drive the output shaft to rotate; wherein, the PCBA board is arranged at the bottom of the inner cavity; the stator assembly is fixedly arranged on the bottom shell and positioned above the PCBA, and the stator assembly is electrically connected with the PCBA; the gear transmission assembly comprises a plurality of gears, the plurality of gears are arranged above the stator assembly, one end of each gear shaft is fixed on the stator core of the stator assembly, and the other end of each gear shaft penetrates through the upper cover. The gear shaft of the transmission gear set has high assembly precision and low working noise.

Description

Actuator

Technical Field

The invention relates to actuator technology.

Background

On a new energy automobile, an actuator is required to control the operation angle of a valve core and accurately control the proportion of cold water and hot water, so that the temperature of a battery is accurately controlled, and the working efficiency and the service life of the battery are prolonged. The executor includes executor shell, PCBA board, stator module, rotor, gear drive assembly and output shaft.

The existing actuator mainly has the following defects:

1. gear shafts of all gears of the gear transmission assembly are arranged on an actuator shell made of plastic, and due to the problems of cooling shrinkage deformation and the like existing in the plastic injection molding process, the manufacturing precision of gear shaft holes formed in the actuator shell is often low, so that the assembly precision of the gear shafts is influenced, the service life of the gear shafts is shortened, and the working noise of an actuator is increased;

2. the gears of the gear transmission assembly of the existing actuator and the stator assembly are arranged on the same plane, and in order to ensure that the volume of the actuator is not too large, the stator assembly is made smaller, so that the air volume is larger, and the air tightness of the actuator is reduced;

3. the side gap of the gear exists in the existing actuator, and the side gaps are different in size due to different temperatures, so that the rotating angle of the valve core cannot be precisely controlled by an output shaft of the actuator, and the proportion of cold water and hot water cannot be precisely controlled.

Disclosure of Invention

The invention aims to solve the technical problem of providing an actuator with high assembly precision of a gear shaft of a transmission gear set, low working noise and good air tightness.

A further object of the present invention is to provide an actuator that can accurately control the position of an output shaft.

The embodiment of the invention provides an actuator, which comprises an actuator shell, a PCBA board, a stator assembly, a rotor, a gear transmission assembly and an output shaft, wherein the PCBA board is arranged on the actuator shell; the actuator shell comprises a bottom shell and an upper cover, and the upper cover is connected with the bottom shell and jointly defines an inner cavity; the stator component is provided with an accommodating cavity, the rotor is at least partially accommodated in the accommodating cavity, and the rotor is connected with the output shaft through the gear transmission component so as to drive the output shaft to rotate; wherein, the PCBA board is arranged at the bottom of the inner cavity; the stator assembly is fixedly arranged on the bottom shell and is positioned above the PCBA, and the stator assembly is electrically connected with the PCBA; the gear transmission assembly comprises a plurality of gears, the plurality of gears are arranged above the stator, one end of a gear shaft of each gear is fixed on the stator core of the stator assembly, and the other end of the gear shaft of each gear penetrates through the upper cover.

The actuator comprises an induction plate and an inductive position sensor, wherein the induction plate is made of a non-magnetic conductive metal material; the induction plate is arranged at the bottom end of the output shaft and can synchronously rotate along with the output shaft; the inductive position sensor is integrated on the PCBA board and faces the sensing board.

The invention has at least the following technical effects:

1. in the embodiment of the invention, one end of a gear shaft of the gear transmission assembly is arranged on the stator core of the stator assembly, and the stator core is composed of silicon steel sheets, so that the manufacturing precision of the gear shaft hole can be ensured, the assembly precision of the gear shaft can be further ensured, the service life of the gear shaft is prolonged, and the working noise of an actuator is reduced;

2. compared with the situation that the gears of the gear transmission assembly and the stator assembly are arranged on the same plane in the prior art, the stator assembly can be made larger under the condition that the volume of the actuator is not changed, so that the air volume of the inner cavity of the actuator is reduced, and the air tightness of the actuator is improved;

3. according to the embodiment of the invention, the induction plate is arranged at the bottom end of the output shaft, when the output shaft drives the induction plate to move, the inductive position sensor senses the position change of the output shaft, the angle position information of the output shaft can be accurately acquired, and the control circuit can accurately control the output shaft to rotate to a required position according to the angle position information of the output shaft;

4. compared with the prior art, the actuator provided by the embodiment of the invention has a more compact structure.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 shows an exploded view of an actuator according to an embodiment of the invention.

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

FIG. 3 illustrates a partial enlarged schematic view of a gear assembly according to an embodiment of the present invention.

Fig. 4 shows an exploded view of an output shaft, a magnetic body, and a PCBA board according to an embodiment of the present invention.

Figure 5 illustrates a top view schematic diagram of a stator assembly according to an embodiment of the present invention.

Fig. 6 shows a schematic cross-sectional view C-C of fig. 5.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Please refer to fig. 1 to 6. An actuator according to an embodiment of the invention includes an actuator housing 1, a PCBA plate 2, a stator assembly 3, a rotor 4, a gear assembly 5, an output shaft 6, an induction plate 71 and an inductive position sensor 72.

The actuator housing 1 comprises a bottom shell 11 and an upper cover 12, wherein the upper cover 12 and the bottom shell 11 are hermetically connected by means of laser welding and jointly define an inner cavity 10.

PCBA board 2 sets up in the bottom of inner chamber 10, and PCBA board 2 is equipped with control circuit. In the present embodiment, the PCBA board 2 is fixed to the bottom case 11 by means of hot riveting. In the present embodiment, the PCBA board 2 is disposed at the bottom of the inner cavity 10, and the area of the PCBA board 2 can be made larger.

Stator module 3 is fixed to be set up in drain pan 11 to be located PCBA board 2's top, stator module 3 and PCBA board 2 electrical connection.

In the present embodiment, the stator assembly 3 includes a three-phase winding 31, a stator core 32, a plastic bobbin 33, a plastic insulating sheet 34, and four PIN legs 35. The plastic framework 33 is wrapped outside the stator core 32, the three-phase winding 31 is wound on the plastic framework 33, and the plastic framework 33 and the plastic insulating sheet 34 are integrally formed in an injection molding mode. The stator assembly 3 is electrically connected to the PCBA board 2 by four PIN legs 35. One end of each of the three PIN legs 35 is connected with the three-phase winding 31, the other end of each of the three PIN legs 35 is connected with the PCBA board 2 in a welded manner, and the three PIN legs 35 are insulated from the stator core 32. One end of the remaining PIN foot 35 is connected with the stator core 32, and the other end of the remaining PIN foot 35 is connected with the ground of the PCBA board 2, so that the function of leading out motor eddy current is achieved. In the present embodiment, only the structure of the four PIN legs 35 is described, and the stator assembly 3 further includes other conventional PIN legs, which will not be described herein.

The stator assembly 3 has a receiving cavity 30, and the rotor 4 is at least partially received in the receiving cavity 30. The rotor 4 is sleeved outside the rotor shaft 44 and is in clearance fit with the rotor shaft 44. In the present embodiment, one end of the rotor shaft 44 is provided with a knurl, 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 case 11 by insert molding, and the other end of the rotor shaft 44 penetrates the upper cover 12. The connection between the rotor shaft 44 and the bottom case 11 may be more secure by providing a knurling on the surface of one end of the rotor shaft 44 injection-molded with the bottom case 11.

The control circuit controls the stator component 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 a gear transmission assembly, so that the output shaft 6 can be driven to rotate.

The gear transmission assembly 5 comprises a plurality of gears, the plurality of gears are arranged above the stator assembly 3, and one end of a 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 is inserted into the upper cover 12.

The above-mentioned meaning of "several" means "one or more". In the present embodiment, the stator core 32 is provided with a plurality of first gear shaft holes 321 corresponding to the gear shafts 56 of the plurality of gears one to one, and each gear shaft 56 is in interference fit with the corresponding first gear shaft hole 321, thereby fixing the gear shaft 56 on the stator core 32. Because the stator core 32 is made of silicon steel sheets, the manufacturing precision of the first gear shaft hole can be ensured, the assembling precision of the gear shaft can be further ensured, the service life of the gear shaft is prolonged, and the working noise of the actuator is reduced. The upper cover 12 is provided with a plurality of second gear shaft holes 123 corresponding to the gear shafts 56 of the plurality of gears 51 one by one, and each gear shaft 56 extends into the corresponding second gear shaft hole 123 to be in clearance fit with the corresponding second gear shaft hole 123. Each gear is sleeved outside the corresponding gear shaft 56 and is in clearance fit with the corresponding gear shaft.

In the present embodiment, the gear transmission assembly 5 includes a first duplicate gear 51, a second duplicate gear 52, and a third duplicate 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 pinion gear, and the input gear 62 is a bull gear. The output gear 41 meshes with the large gear of the first duplicate gear 51, the small gear of the first duplicate gear 51 meshes with the large gear of the second duplicate gear 52, the small gear of the second duplicate gear 52 meshes with the large gear of the third duplicate gear 53, and the small gear of the third duplicate gear 53 meshes with the input gear 62.

Stator module 3 is equipped with first output shaft hole 37, and upper cover 12 is equipped with second output shaft hole 122, and first output shaft hole 37 and second output shaft hole 122 are passed respectively to the bottom and the top of output shaft 6. A stopper 61 is provided on a side surface of the output shaft 6, and the stopper 61 abuts against the stator assembly 3. In the present embodiment, the stopper portion 61 is an annular step provided on the side surface 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 cover of output shaft 6 is equipped with sealing washer 8, and sealing washer 8 is sealed with the inner peripheral surface of annular lateral wall 124 and is cooperated to realize the sealed between output shaft 6 and upper cover 12.

The induction plate 71 is mounted at the bottom end of the output shaft 6 and can rotate synchronously with the output shaft 6. An inductive position sensor 72 is integrated on the PCBA board 2 and faces the sensor board 71. The sensing plate is made of a non-magnetically permeable metal material such as stainless steel.

In the present embodiment, the sensing plate 71 is circular, and the side surface of the sensing plate 71 is opened with a notch 710. The bottom surface of the output shaft 6 is provided with a plurality of grooves 63, the side surface of the induction plate 71 is provided with a plurality of protrusions 73 protruding outwards, and the plurality of protrusions 73 are respectively embedded into the plurality of grooves 63 in a one-to-one correspondence manner. When the output shaft 6 drives the induction plate 71 to move, the coil of the inductive position sensor 72 senses the position change of the output shaft 6 and outputs a voltage signal, so that the angular position information of the output shaft 6 can be accurately acquired, and the control circuit on the PCBA board 2 can accurately control the rotation angle of the motor (i.e. the rotation angle of the rotor 4) according to the angular position information of the output shaft 6, so as to accurately control the output shaft 6 to rotate to a required position.

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

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An actuator comprises an actuator shell, a PCBA board, a stator assembly, a rotor, a gear transmission assembly and an output shaft; the actuator shell comprises a bottom shell and an upper cover, and the upper cover is connected with the bottom shell and jointly defines an inner cavity; the stator assembly is provided with an accommodating cavity, the rotor is at least partially accommodated in the accommodating cavity, and the rotor is connected with the output shaft through the gear transmission assembly so as to drive the output shaft to rotate; the PCBA is arranged at the bottom of the inner cavity;

the stator assembly is fixedly arranged on the bottom shell and is positioned above the PCBA, and the stator assembly is electrically connected with the PCBA;

the gear transmission assembly comprises a plurality of gears, the plurality of gears are arranged above the stator assembly, one end of each gear shaft of the gears is fixed on the stator core of the stator assembly, and the other end of each gear shaft of the gears penetrates through the upper cover.

2. The actuator of claim 1, wherein the actuator comprises an induction plate and an inductive position sensor, the induction plate being made of a non-magnetically conductive metallic material;

the induction plate is arranged at the bottom end of the output shaft and can synchronously rotate along with the output shaft;

the inductive position sensor is integrated on the PCBA board and faces the sensor board.

3. The actuator according to claim 2, wherein the bottom surface of the output shaft is provided with a plurality of grooves, and the side surface of the sensing plate is provided with a plurality of protrusions protruding outward, and the plurality of protrusions are respectively fitted into the plurality of grooves in a one-to-one correspondence.

4. The actuator of claim 3, wherein the side of the sensing plate is notched.

5. The actuator of claim 1, wherein the stator core is provided with a plurality of gear shaft holes in one-to-one correspondence with gear shafts of the plurality of gears, each of the gear shafts being in interference fit with a corresponding gear shaft hole.

6. The actuator of claim 1 or 5, wherein the stator assembly comprises three phase windings, a stator core, a plastic skeleton, and a plastic insulating sheet; the plastic framework is wrapped outside the stator core, the three-phase winding is wound on the plastic framework, and the plastic framework and the plastic insulating sheet are integrally formed in an injection molding mode.

7. The actuator of claim 6, wherein the stator assembly comprises four PIN legs; one ends of the three PIN PINs are respectively connected with the three-phase winding, the other ends of the three PIN PINs are respectively connected with the PCBA, and the three PIN PINs and the stator core are kept insulated; one end of the rest PIN foot is connected with the stator core, and the other end of the rest PIN foot is connected with the ground of the PCBA board.

8. The actuator of 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 the top of the output shaft respectively pass through the first shaft hole and the second shaft hole;

and a stopping part is arranged on the side surface of the output shaft and is abutted against the stator assembly.

9. The actuator of claim 8, wherein the top cap has an annular sidewall around the second output shaft aperture;

the top of the output shaft is sleeved with a sealing ring, and the sealing ring is in sealing fit with the inner circumferential surface of the annular side wall.

10. The actuator of claim 1, wherein one end of a rotor shaft of the rotor is knurled and the other end of the rotor shaft is an optical axis; one end of the rotor shaft is fixed on the bottom shell in an insert injection molding mode, and the other end of the rotor shaft penetrates through the upper cover.