CN222185694U

CN222185694U - External gear box of electric actuator and electric actuator

Info

Publication number: CN222185694U
Application number: CN202420104919.4U
Authority: CN
Inventors: 林凤铖; 童加伟; 卢可产
Original assignee: Eltorque Automation Xiamen Co ltd
Current assignee: Eltorque Automation Xiamen Co ltd
Priority date: 2024-01-16
Filing date: 2024-01-16
Publication date: 2024-12-17
Anticipated expiration: 2034-01-16

Abstract

The present application discloses an external gearbox for an electric actuator, comprising a bottom shell, a connecting plate, an inner gear ring, a sun gear, a flange output shaft and a plurality of planetary gears. The bottom shell is provided with an output shaft hole, the connecting plate is fixed to the open end of the bottom shell and is provided with an input shaft hole, the inner gear ring is clamped and fixed between the bottom shell and the connecting plate and is sealed with the two, and the sun gear comprises a gear and a connecting plate coaxially connected to the gear and passing through the input shaft hole. A plurality of planetary gears are arranged around and meshed with the sun gear and the inner gear ring. The flange output shaft comprises a flange connected to the planetary gear and an output shaft coaxially connected to the flange and rotatably supported in the output shaft hole. The external gearbox of the present application adopts a coaxial structure, occupies a small space, is easy to operate, and can effectively prevent water and dust. The present application also discloses an electric actuator having the external gearbox, which has a small overall volume and is conducive to saving installation space.

Description

External gear box of electric actuator and electric actuator

Technical Field

The utility model relates to the technical field of electric actuators, in particular to an external gear box of an electric actuator and the electric actuator.

Background

With the continuous development of the industrial automation field, electric actuators are widely used in various industrial applications, and are driven by electricity to realize the operation control of various devices such as valves.

The prior external gear box of the electric actuator is usually of an eccentric structure, for example, the utility model patent with the publication number of CN219994519U discloses an electric actuator, which comprises a mounting base, wherein a servo motor and a secondary speed reducer which are mutually driven are arranged on the mounting base, an actuating shaft is arranged on the bottom of the mounting base in a penetrating way, the actuating shaft is mutually driven with the secondary speed reducer, a worm is arranged on the mounting base in a penetrating way, a front cover plate and a rear cover plate are arranged on the mounting base, shaft sleeves are respectively arranged on the inner sides of the front cover plate and the rear cover plate, the rear end of the worm is inserted into the rear shaft sleeves, the front end of the worm is penetrated into the front shaft sleeve, the front end of the worm penetrates through the front cover plate, the worm can slide back and forth in the two shaft sleeves, a worm wheel is sleeved and fixed on the outer side of the actuating shaft, the worm is meshed with the worm and is driven in a meshed way, the worm can be separated from the worm wheel after rotating backwards, a clamping connector is arranged on the front end of the worm, an annular positioning groove is arranged on the side wall of the front part of the worm, a self-locking type indexing pin is connected on one side of the front cover plate, and a pin of the self-locking type indexing pin can transversely penetrate through the annular positioning groove. The structure of the electric actuator is complex, is easily influenced by dust or water stains, has large volume, occupies a relatively large space and brings certain inconvenience to operation.

Disclosure of utility model

The utility model aims at providing an external gear box of an electric actuator, which adopts a coaxial structure, occupies small space, is convenient to operate, can effectively prevent water and dust, and aims at providing an actuator so as to improve the use efficiency and the operation convenience.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

The utility model provides an external gear box of an electric actuator, which comprises a bottom shell, a connecting plate, an inner gear ring, a sun gear, a flange output shaft and a plurality of planetary gears. One end of the bottom shell is open the other end is provided with an output shaft hole. The connecting plate is fixed at the open end of the bottom shell and is provided with an input shaft hole. The inner gear ring is clamped and fixed between the bottom shell and the connecting plate and is in sealing fit with the bottom shell and the connecting plate. The sun gear comprises an input shaft and a gear which are coaxially connected, the sun gear is coaxially arranged in the annular gear, and the input shaft penetrates out of the connecting plate from the input shaft hole. The planetary gears are arranged between the sun gear and the inner gear ring in a surrounding manner and meshed with the sun gear and the inner gear ring. The flange output shaft comprises a flange plate and an output shaft which are coaxially connected, the output shaft is rotatably supported in the output shaft hole, and the flange plate is connected with the planet wheel. The sun wheel rotates to drive the planet wheel to revolve and simultaneously rotate, and the planet wheel revolves to drive the flange output shaft to rotate.

Preferably, the input shaft is a non-circular cross-section shaft, such as a square shaft.

Preferably, the planet wheel comprises a planet gear meshed with the inner gear ring and the sun gear, a first bearing fixed in the planet gear, and a planet shaft connecting the first bearing and the flange plate.

Preferably, the sun gear further comprises an extension bar, a central perforation is formed in the sun gear, and one end of the extension bar penetrates through the central perforation and is fixedly connected with the flange output shaft.

Preferably, the connecting plate is detachably connected with the bottom shell through a first screw, and a screw clamping groove matched with the first screw in a clamping manner is formed in the outer peripheral surface of the inner gear ring so as to limit the rotation of the inner gear ring.

Preferably, a first sealing ring is arranged between the connecting plate and the annular gear, a second sealing ring is arranged between the annular gear and the bottom shell, and an oil seal sleeved on the output shaft is arranged in the output shaft hole.

Preferably, the outer peripheral surface of the output shaft is provided with an annular step, and a first step surface facing the connecting plate and a second step surface facing away from the connecting plate are arranged in the output shaft hole. The output shaft is sleeved with a second bearing, a third bearing and a retainer ring, the end face of the outer ring of the second bearing is abutted with the first step face, the end face of the inner ring of the second bearing is abutted with the step face of the annular step, the end face of the outer ring of the third bearing is abutted with the second step face, and the end face of the inner ring of the third bearing is abutted with the retainer ring.

The utility model also provides an electric actuator, which comprises an electric actuator body and the external gear box of the electric actuator. The connecting plate of the external gear box is fixedly connected with the electric actuator body through a second screw, and the input shaft of the sun gear is connected with the power output shaft of the electric actuator body.

Preferably, a third sealing ring is arranged between the connecting plate and the electric actuator body.

Preferably, the power output shaft of the electric actuator body is provided with a non-circular hole, and the input shaft of the sun gear is a non-circular section shaft matched with the non-circular hole.

By adopting the technical scheme, the utility model has the beneficial effects that:

1. The external gear box of the electric actuator adopts a planetary gear transmission system, and the input and the output of the external gear box are coaxial, so that compared with the existing external gear box with an eccentric structure, the external gear box of the electric actuator has the advantages of simpler structure and smaller volume, and is beneficial to saving the installation space. And because other parts are basically arranged in the inner space formed by the connecting plate, the bottom shell and the annular gear, the effectiveness of water and dust prevention of the external gear box can be ensured by enhancing the tightness among the three parts.

2. The external gear box is arranged on the electric actuator, so that the whole volume is smaller, the installation space is saved, the use efficiency is higher, and the operation is more convenient.

Drawings

Fig. 1 is a schematic half-sectional view of an external gearbox of an electric actuator according to a first embodiment.

Fig. 2 is an exploded view of an external gearbox of an electric actuator according to the first embodiment.

Fig. 3 is a schematic perspective view of an electric actuator according to a second embodiment.

Fig. 4 is a schematic front view of an electric actuator according to a second embodiment.

Fig. 5 is a schematic semi-sectional view of an electric actuator according to a second embodiment.

Fig. 6 is an exploded view of an electric actuator according to the second embodiment.

The novel planetary gear transmission comprises a bottom shell, a2 output shaft hole, a 3 connecting plate, a 4 input shaft hole, a 5 annular gear, a 6 sun gear, a 7 input shaft, a 8 gear, a 9 planetary gear, a 10 flange output shaft, a 11 flange plate, a 12 output shaft, a 13 planetary gear, a 14 first bearing, a 15 planetary shaft, a 16 lengthening rod, a 17 central perforating hole, a 18 first screw, a 19 screw clamping groove, a 20 first sealing ring, a 21 second sealing ring, a 22 third sealing ring, a 23 oil seal, a 24 annular step, a 25 first step surface, a 26 second step surface, a 27 second bearing, a 28 third bearing, a 29 check ring, a 30 electric actuator body, a 31 second screw, a 32 noncircular hole and a power output shaft.

Detailed Description

The utility model will be further described with reference to the drawings and detailed description.

Example 1

As shown in fig. 1 and 2, the external gearbox of the electric actuator of the embodiment comprises a bottom shell 1, a connecting plate 3, an inner gear ring 5, a sun gear 6, a flange output shaft 10, an extension bar 16 and six planetary gears 9. One end of the bottom shell 1 is open, and the other end is provided with an output shaft hole 2. The connecting plate 3 is fixed at the open end of the bottom shell 1 through three first screws 18 uniformly distributed in the circumferential direction, and the connecting plate 3 is provided with an input shaft hole 4 coaxial with the output shaft hole 2. The annular gear 5 is clamped and fixed between the bottom shell 1 and the connecting plate 3, a screw clamping groove 19 which is matched with the first screw 18 in a clamping way is formed in the outer peripheral surface of the annular gear 5, and the circumferential rotation of the annular gear 5 is limited through the screw clamping groove 19 and the first screw 18, so that the connecting plate 3, the annular gear 5 and the bottom shell 1 are fixedly connected. The sun gear 6 is arranged in the inner gear ring 5 and is coaxial with the inner gear ring 5. Six planetary gears 9 are circumferentially arranged between the sun gear 6 and the annular gear 5 and meshed with the sun gear 6 and the annular gear 5 so as to drive the planetary gears 9 to revolve around the sun gear 6 and simultaneously rotate through the rotation of the sun gear 6. The flange output shaft 10 is rotationally connected with the six planetary gears 9 and the bottom shell 1 and is coaxial with the sun gear 6, and the revolution of the planetary gears 9 drives the flange output shaft 10 to rotate, so that the output speed and the torque force are reduced. The sun gear 6 is provided with a central through hole 17, one end of the extension rod 16 penetrates through the central through hole 17 and is fixedly connected with the flange output shaft 10, and the extension rod 16 can synchronously and upwards transmit rotation angle information of the flange output shaft 10.

Specifically, the sun gear 6 of the present embodiment includes an input shaft 7 and a gear 8. The input shaft 7 is coaxially connected with a gear 8, the gear 8 is meshed with six planetary gears 9, and the input shaft 7 is a shaft with a non-circular section, preferably a square shaft. The input shaft 7 extends out of the connecting plate 3 from the input shaft hole 4 for connecting power input.

The planet wheel 9 comprises a planet gear 13, a first bearing 14 and a planet shaft 15, wherein the planet gear 13 is arranged between the sun wheel 6 and the annular gear 5 and meshed with the sun wheel 6 and the annular gear 5, the first bearing 14 is fixed in the planet gear 13, and one end of the planet shaft 15 is assembled in the first bearing 14. The first bearing 14 is preferably a needle bearing to facilitate miniaturization of the external gearbox. The flange output shaft 10 comprises a flange plate 11 and an output shaft 12, wherein the flange plate 11 and the output shaft 12 are coaxially connected, six shaft holes are formed in the flange plate 11, and the other end of the planetary shaft 15 is assembled in the shaft holes. The output shaft 12 is rotatably supported in the output shaft hole 2 by a second bearing 27 and a third bearing 28. The second bearing 27 and the third bearing 28 are preferably deep groove ball bearings, and the provision of a plurality of bearings facilitates the improvement of the rotational stability of the flange output shaft 10.

In order to improve the assembly efficiency, the first step surface 25 facing the connecting plate 3 and the second step surface 26 facing away from the connecting plate 3 are arranged in the output shaft hole 2, the annular step 24 is arranged on the outer peripheral surface of the output shaft 12 of the flange output shaft 10, and the second bearing 27 can be directly pressed between the first step surface 25 and the annular step 24 to realize axial limiting during assembly. The third bearing 28 is pressed onto the second step surface 26 for axial limitation by a retainer ring 29 clamped on the output shaft 12. The assembly is simple, and no excessive fasteners are required.

In order to improve the tightness of the external gear box, a first sealing ring 20 is arranged between the connecting plate 3 and the annular gear 5, a second sealing ring 21 is arranged between the annular gear 5 and the bottom shell 1 and is responsible for water and dust prevention of the matching surface, an oil seal 23 sleeved on the output shaft 12 is arranged in the output shaft hole 2 and is responsible for water and dust prevention of the output part.

Example two

As shown in fig. 3 to 6, the electric actuator of the present embodiment includes an electric actuator body 20 and an electric actuator external gear box of the first embodiment. A non-circular hole 32 is formed in the axis of the power output shaft 33 of the electric actuator body 30 and is in plug-in fit with a non-circular section shaft of an external gear box. The connecting plate 3 and the electric actuator body 30 are fixedly connected by a plurality of second screws 31 to realize the fixed connection of the external gear box and the electric actuator body 30, and a coupling is not required to be arranged to connect the power output shaft 33 of the electric actuator body 30 and the input shaft 7 of the external gear box. Meanwhile, the electric actuator body 30 and the external gear box are convenient to seal, and the effective waterproof and dustproof performance of the matching surfaces of the electric actuator body 30 and the external gear box can be ensured only by arranging the third sealing ring 22 between the connecting plate 3 and the electric actuator body 30.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. An electric actuator external gear box, comprising:

a bottom shell (1) with one end open and the other end provided with an output shaft hole (2);

The connecting plate (3) is provided with an input shaft hole (4), and the connecting plate (3) is fixed at the open end of the bottom shell (1);

an inner gear ring (5) clamped and fixed between the bottom shell (1) and the connecting plate (3) and in sealing fit with the bottom shell (1) and the connecting plate (3);

The sun gear (6) comprises an input shaft (7) and a gear (8) which are coaxially connected, the sun gear (6) is coaxially arranged in the inner gear ring (5), and the input shaft (7) penetrates out of the connecting plate (3) from the input shaft hole (4);

a plurality of planet gears (9) are circumferentially arranged between the sun gear (6) and the inner gear ring (5) and meshed with the sun gear (6) and the inner gear ring (5);

the flange output shaft (10) comprises a flange plate (11) and an output shaft (12) which are coaxially connected, the output shaft (12) is rotatably supported in the output shaft hole (2), and the flange plate (11) is connected with the planet wheel (9);

The sun wheel (6) rotates to drive the planet wheel (9) to revolve and simultaneously rotate, and the planet wheel (9) revolves to drive the flange output shaft (10) to rotate.

2. An electric actuator external gearbox according to claim 1, characterised in that the input shaft (7) is a non-circular cross-section shaft.

3. The external gearbox for the electric actuator according to claim 1, wherein the planetary gear (9) comprises a planetary gear (13) meshed with the annular gear (5) and the sun gear (6), a first bearing (14) fixed in the planetary gear (13), and a planetary shaft (15) connecting the first bearing (14) and the flange plate (11).

4. The external gearbox of the electric actuator according to claim 1, further comprising an extension bar (16), wherein the sun wheel (6) is provided with a central through hole (17), and one end of the extension bar (16) penetrates from the central through hole (17) and is fixedly connected with the flange output shaft (10).

5. The external gearbox of the electric actuator according to claim 1, wherein the connecting plate (3) is detachably connected with the bottom shell (1) through a first screw (18), and a screw clamping groove (19) which is in clamping fit with the first screw (18) is formed in the outer circumferential surface of the inner gear ring (5) so as to limit the rotation of the inner gear ring (5).

6. The external gearbox of the electric actuator according to claim 1, wherein a first sealing ring (20) is arranged between the connecting plate (3) and the annular gear (5), a second sealing ring (21) is arranged between the annular gear (5) and the bottom shell (1), and an oil seal (23) sleeved on the output shaft (12) is arranged in the output shaft hole (2).

7. The external gearbox of the electric actuator according to claim 3, wherein the outer peripheral surface of the output shaft (12) is provided with an annular step (24), a first step surface (25) facing the connecting plate (3) and a second step surface (26) facing away from the connecting plate (3) are arranged in the output shaft hole (2), the output shaft (12) is sleeved with a second bearing (27), a third bearing (28) and a retainer ring (29), the outer ring end surface of the second bearing (27) is abutted with the first step surface (25), the inner ring end surface of the second bearing (27) is abutted with the step surface of the annular step (24), the outer ring end surface of the third bearing (28) is abutted with the second step surface (26), and the inner ring end surface of the third bearing (28) is abutted with the retainer ring (29).

8. The electric actuator external gearbox of claim 7, wherein the first bearing (14) is a needle bearing and the second bearing (27) and the third bearing (28) are deep groove ball bearings.

9. An electric actuator is characterized by comprising an electric actuator body (30) and the external gearbox of the electric actuator according to any one of claims 1-8, wherein the connecting plate (3) is fixedly connected with the electric actuator body (30), and an input shaft (7) of the sun gear (6) is connected with a power output shaft (33) of the electric actuator body (30).

10. The electric actuator according to claim 9, wherein a third sealing ring (22) is arranged between the connecting plate (3) and the electric actuator body (30), a non-circular hole (32) is formed in a power output shaft (33) of the electric actuator body (30), and the input shaft (7) of the sun gear (6) is a non-circular section shaft matched with the non-circular hole (32).