Gear box capable of switching power input end and electric actuating mechanism using gear box

Abstract

The invention discloses a gear box capable of switching a power input end and an electric actuating mechanism using the gear box, and belongs to the technical field of gear boxes. The gear box capable of switching the power input end comprises a box body, a gear assembly and a power output assembly; when the second power input end is used for power input, the second power input end brakes to enable the outer gear ring to be in a non-rotating state, the inner gear drives the combined gear frame to rotate through the N transition gears, and therefore the power output lead screw is driven to rotate to output power, and when the second power input end is used for power input, the outer gear ring is driven to be in a non-rotating state. The first power input end is braked to enable the inner gear to be in a non-rotating state, the outer gear ring drives the combined gear frame to rotate through the N transition gears, and therefore the power output lead screw is driven to rotate to output power.

Description

Technical Field

[0001] The present invention relates to the technical field of gear boxes, and in particular to a gear box with a switchable power input end and an electric actuator using the gear box. Background Art

[0002] With the rapid development of science and technology, electric actuators are widely used in transmission equipment and transportation equipment. Electric actuators are generally used as supporting, opening, erecting, and adjusting devices. Compared with hydraulic cylinders, electric actuators do not have oil tanks and hydraulic pipelines, etc., there is no leakage, and the environmental protection performance is good.

[0003] Electric actuators usually have a gearbox for output transmission. The gearboxes installed in existing electric actuators are mostly of a single input structure. When the power input end of the electric actuator fails, the entire machine needs to be shut down for maintenance, which will cause a large development risk. At the same time, the inspection and replacement of the power input end of the faulty electric actuator will waste cycles. Therefore, it is urgent to design a gearbox with a switchable power input end and an electric actuator using the gearbox to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is: by setting up a gear box capable of switching power input ends, when one of the power input ends fails and the brake is engaged, the other power input end can provide power input in time to ensure the progress of subsequent work. By providing redundant backup for each other between multiple power input ends, the reliability of the entire mechanism is improved and the loss caused by a failure of a single input end is reduced.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a gear box with a switchable power input end, comprising: a box body, a gear assembly and a power output assembly;

[0006] The power output assembly includes an outer cylinder and a power output screw, the outer cylinder is mounted on the box body, the power output screw is arranged in the outer cylinder and one end of the power output screw extends into the box body, and the gear assembly is mounted in the box body;

[0007] The gear assembly comprises an internal gear, a combined gear frame, N transition gears and an outer gear ring. The combined gear frame is a rotating body structure with a central axis and the central axis as a rotating axis. The internal gear, the combined gear frame and the outer gear ring are installed in a housing with the common central axis. The internal gear comprises an input gear part and a transmission gear part. The input gear part is used for driving connection with an external power input end one. The input gear part and the transmission gear part are distributed along the central axis. A gear frame through-opening is provided in the middle part of the combined gear frame along the central axis. N transition gear mounting grooves are uniformly provided on the combined gear frame along the circumferential direction with the central axis as a reference. The N transition gears are installed one by one in the N transition gear mounting grooves. An inner gear ring is provided on the inner surface of the outer gear ring, and an outer gear ring is provided on the outer surface of the outer gear ring. The outer gear ring is used for driving connection with an external power input end two.

[0008] The transmission gear portion of the internal gear is located in the through-hole of the gear frame and is meshed with each of the N transition gears. The outer gear ring is mounted outside the combined gear frame and the inner gear ring is meshed with each of the N transition gears.

[0009] The inner gear is provided with an inner gear through-hole along the central axis, the power output screw rod extends to one end of the housing and passes through the inner gear through-hole and the gear rack through-hole, the power output screw rod passes through the inner gear through-hole and is located at the gear rack through-hole and is fixedly connected to the combined gear rack through a connecting key;

[0010] When power is input through the power input end one, the power input end two is braked so that the outer gear is in a non-rotating state, and the inner gear drives the combined gear frame to rotate through the N transition gears, thereby driving the power output screw to rotate for power output. When power is input through the power input end two, the power input end one is braked so that the inner gear is in a non-rotating state, and the outer gear drives the combined gear frame to rotate through the N transition gears, thereby driving the power output screw to rotate for power output.

[0011] As a preferred technical solution of the present invention, the combined gear rack includes a central cylindrical portion, a first side cylindrical portion and a second side cylindrical portion, the first side cylindrical portion, the central cylindrical portion and the second side cylindrical portion are sequentially connected along the central axis, the gear rack through-opening is opened on the first side cylindrical portion, the central cylindrical portion and the second side cylindrical portion along the central axis, and N transition gear mounting grooves are opened on the circumference of the central cylindrical portion.

[0012] As a preferred technical solution of the present invention, the transition gear includes a transition gear center shaft, a transition gear needle roller bearing and a transition gear tooth wheel passing through the middle part, a center shaft mounting hole is opened in the transition gear mounting groove, the transition gear center shaft is installed in the center shaft mounting hole in the corresponding transition gear mounting groove, and the transition gear tooth wheel is mounted on the corresponding transition gear center shaft through the transition gear needle roller bearing.

[0013] As a preferred technical solution of the present invention, the connection between the input gear part and the transmission gear part includes a connecting column, and the internal gear through-hole is opened along the central axis in the input gear part, the connecting column and the transmission gear part. A plurality of connecting column needle roller bearings are arranged on the outer periphery of the connecting column, and the connecting column is rotatably connected to the gear frame through-hole through the connecting column needle roller bearing.

[0014] As a preferred technical solution of the present invention, gear rack bearings are provided on the outer periphery of the first side cylindrical portion and the outer periphery of the second side cylindrical portion, and the combined gear rack is rotatably installed in the housing through the gear rack bearings.

[0015] As a preferred technical solution of the present invention, an outer gear ring bearing is provided at the outer peripheral edge of the outer gear ring, and the outer gear ring is rotatably installed in the housing through the outer gear ring bearing.

[0016] As a preferred technical solution of the present invention, an internal gear bearing is provided on the input gear portion, and the internal gear is rotatably mounted in the housing through the internal gear bearing.

[0017] An electric actuator using the gearbox with switchable power input end, comprising: a first drive motor, a second drive motor and a power output assembly;

[0018] The first drive motor is arranged on the box body, and the output end of the first drive motor extends into the box body and is connected with a first drive gear, and the first drive gear is meshed and connected with the input gear part;

[0019] The second drive motor is arranged on the housing, the output end of the second drive motor is connected to the input end of the clutch, the output end of the clutch is connected to the second drive gear, the second drive gear is located in the housing and meshed with the outer gear ring;

[0020] The power output assembly includes a nut slidably connected to an outer tube, a push rod connected to the nut and located in the outer tube, the nut is threadedly connected to the power output screw, and the push rod is sleeved outside the power output screw and is not connected to the power output screw.

[0021] As a preferred technical solution of the present invention, a position sensor compartment is provided on the box body, the position sensor compartment is connected to the box body, the power output screw extends into the position sensor compartment, a position sensor is provided in the position sensor compartment, the position sensor is mounted on the outer periphery of the power output screw rod for obtaining the number of rotations of the power output screw rod, and the power output screw rod is located on the inner part of the outer cylinder and adopts a trapezoidal thread.

[0022] As a preferred technical solution of the present invention, a manual drive component is provided on the housing, and the manual drive component includes a through shaft, a manual drive gear, a tightening outer cylinder and a tightening pin. The second drive gear includes a manual matching gear wheel and an outer ring gear matching gear wheel. The manual matching gear wheel is coaxially connected with the outer ring gear matching gear wheel, and the outer ring gear matching gear wheel is meshingly connected with the outer ring gear. The through shaft penetrates the housing and is rotatably connected with the housing. The manual drive gear is installed at one end of the through shaft located in the housing. The manual drive gear is meshingly connected with the manual matching gear wheel. The tightening outer cylinder is installed outside the housing and is sleeved on the outside of the through shaft. The tightening outer cylinder and the through shaft located outside the housing are both provided with a tightening pin plug hole, and the tightening pin can be simultaneously inserted into the tightening pin plug holes on the tightening outer cylinder and the through shaft.

[0023] The beneficial effects of the present invention are embodied in:

[0024] 1. By arranging an internal gear, a combined gear frame, a transition gear and an outer gear ring, the transmission gear portion in the internal gear is meshed with the transition gear and the inner gear ring on the outer gear ring is meshed with the transition gear, so that the power input terminal 1 and the power input terminal 2 can serve as backup redundancy for each other, so as to realize the switching of the power input terminal between the power input terminal 1 and the power input terminal 2. When a fault occurs in one of the power input terminals and the brake is engaged, the other power input terminal can provide power input in time to ensure the power output.

[0025] 2. By setting up the first drive motor, the second drive motor and the clutch, they can be used as the power input end of the gearbox, so that the first drive motor and the second drive motor can serve as redundant backups for each other. When one of the drive motors fails, the other drive motor can be used as power input to ensure the operation of the electric actuator.

[0026] 3. By setting up a manual drive component, another manual drive mode is provided for power input, further improving the reliability of the electric actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front cross-sectional schematic diagram of the box body and other parts of the present invention;

[0028] Figure 2is a front cross-sectional schematic diagram of the internal gear portion of the present invention;

[0029] Figure 3 is a front cross-sectional schematic diagram of the combined gear rack portion of the present invention;

[0030] Figure 4 is a side view schematic diagram of the combined gear rack portion of the present invention;

[0031] Figure 5 is a side cross-sectional schematic diagram of the combined gear rack portion of the present invention;

[0032] Figure 6 is a front cross-sectional schematic diagram of the transition gear portion of the present invention;

[0033] Figure 7 The present invention Figure 1 A magnified schematic diagram of part A;

[0034] Figure 8 The present invention Figure 1 A magnified schematic diagram of part B;

[0035] Fig. 9 The present invention Figure 1 A magnified schematic diagram of part C;

[0036] Fig.10 The present invention Figure 1 The enlarged schematic diagram of the D part;

[0037] Fig.11 It is a front cross-sectional schematic diagram of the second driving gear portion of the present invention.

[0038] In the figure: 1, box body; 101, box body compartment; 102, first box body cover; 103, second box body cover; 2, outer cylinder; 3, power output screw; 301, connecting key; 4, internal gear; 401, input gear part; 402, connecting column; 403, transmission gear part; 404, internal gear through-hole; 405, connecting column needle bearing; 5, combined gear rack; 501, center cylindrical part; 502, first side cylindrical part; 503, second side cylindrical part; 504, transition gear mounting groove; 505, middle shaft mounting hole; 506, gear rack through-hole; 6, transition gear; 601, transition gear middle shaft; 602, transition gear Gear tooth wheel; 603, transition gear needle roller bearing; 7, outer gear ring; 701, outer gear ring; 702, inner gear ring; 8, inner gear bearing; 9, gear frame bearing; 10, outer gear ring bearing; 11, first drive motor; 111, first drive gear; 12, second drive motor; 13, clutch; 131, second drive gear; 1311, outer gear ring matching gear tooth wheel; 1312, manual matching gear tooth wheel; 14, nut; 15, push rod; 16, manual drive assembly; 161, through shaft; 162, manual drive gear; 163, tightening outer cylinder; 164, tightening pin; 17, position sensor compartment; 171, position sensor. DETAILED DESCRIPTION

[0039] The present invention will now be described in further detail with reference to the accompanying drawings.

[0040] Combined with Figure 1-11 As shown, a space-saving built-in home elevator includes.

[0041] Combined with Figure 1-11As shown, a gearbox with a switchable power input end comprises: a housing 1, a gear assembly and a power output assembly, wherein the power output assembly comprises an outer cylinder 2 and a power output screw 3, wherein the outer cylinder 2 is mounted on the housing 1, wherein the power output screw 3 is arranged in the outer cylinder 2 and one end of the power output screw 3 extends into the housing 1, preferably, the power output screw 3 is drivingly connected to an external power bearing device for power output transmission, wherein the power output screw 3 can rotate relative to the housing 1, wherein the gear assembly is mounted in the housing 1, wherein the gear assembly comprises an internal gear 4, a combined gear frame 5, N transition gears 6 and an outer gear ring 7, wherein preferably, the N is greater than or equal to 2, and the combined gear frame 5 has a central axis and takes the central axis as a rotation axis The rotating body structure, specifically, the combined gear frame 5 includes a central cylindrical portion 501, a first side cylindrical portion 502 and a second side cylindrical portion 503, the first side cylindrical portion 502, the central cylindrical portion 501 and the second side cylindrical portion 503 are sequentially connected along the central axis, preferably, the first side cylindrical portion 502 is a cylindrical structure with a step gradient, the second side cylindrical portion 503 is a cylindrical structure with a step gradient, the central cylindrical portion 501 is a cylindrical structure, the internal gear 4, the combined gear frame 5 and the outer gear ring 7 are installed in the housing 1 with the common central axis, the internal gear 4 includes an input gear portion 401 and a transmission gear portion 403, the input gear portion 401 and the transmission gear portion The connection between the wheel parts 403 includes a connecting column 402. Preferably, the input gear part 401 and the transmission gear part 403 are both gear plate structures, and the gear plate diameter of the input gear part 401 is larger than the gear plate diameter of the transmission gear part 403. The connecting column 402 is a cylindrical structure. The input gear part 401 is used for driving connection with an external power input end. The input gear part 401 and the transmission gear part 403 are distributed along the central axis. A gear frame through-opening 506 is opened in the middle part of the combined gear frame 5 along the central axis. Specifically, the gear frame through-opening 506 is opened on the first side cylindrical part 502, the center cylindrical part 501 and the second side cylindrical part 503 along the central axis. N transition gear mounting grooves 504 are uniformly opened on the frame 5 along the circumferential direction with the central axis as the reference. Specifically, the N transition gear mounting grooves 504 are opened in the circumferential direction of the central cylindrical portion 501. Preferably, the transition gear mounting groove 504 connects the gear frame through-port 506 with the outside of the combined gear frame 5. The N transition gears 6 are installed one by one in the N transition gear mounting grooves 504. Specifically, the transition gear 6 includes a transition gear central axis 601, a transition gear needle bearing 603 and a transition gear tooth wheel 602 passing through the middle. A central axis mounting hole 505 is opened in the transition gear mounting groove 504. The transition gear central axis 601 is installed in the central axis mounting hole 505 in the corresponding transition gear mounting groove 504.The transition gear tooth wheel 602 is mounted on the corresponding transition gear center shaft 601 through a transition gear needle roller bearing 603. The inner surface of the outer gear ring 7 is provided with an inner gear ring 702, and the outer surface of the outer gear ring 7 is provided with an outer gear ring 701. The outer gear ring 701 is used for driving connection with the external power input terminal 2. The transmission gear part 403 of the internal gear 4 is located in the gear frame through-hole 506 and is meshed with each of the N transition gears 6. The outer periphery of the connecting column 402 is provided with a plurality of connecting column needle roller bearings 405. The connecting column 402 is rotatably connected to the gear frame through-hole 506 through the connecting column needle roller bearing 405. Preferably, the The transmission gear portion 403 is completely located in the gear frame through-opening 506, the outer gear ring 7 is mounted on the outside of the combined gear frame 5, and the inner gear ring 702 is meshed with each of the N transition gears 6, the inner gear 4 is provided with an inner gear through-opening 404 along the central axis, specifically, the inner gear through-opening 404 is provided in the input gear portion 401, the connecting column 402 and the transmission gear portion 403 along the central axis, the power output screw rod 3 extends to one end of the housing 1 through the inner gear through-opening 404 and the gear frame through-opening 506, the power output screw rod 3 passes through the inner gear through-opening 404 and is located at the gear frame through-opening 506 through the connecting key 30 1 is fixedly connected to the combined gear frame 5, and the power output screw rod 3 can rotate relative to the internal gear 4. When the power input end 1 is used for power input, the power input end 2 is in a brake state, so that the outer gear ring 7 is in a non-rotating state. The power input end 1 is through the internal gear 4, and cooperates with a plurality of transition gears 6 to rotate the combined gear frame 5. With the rotation of the combined gear frame 5, under the action of the connecting key 301, the power output screw rod 3 is driven to rotate, so that power output is achieved through the rotating power output screw rod 3. When the power input end 2 is used for power input, the power input end 1 is in a brake state, so that the internal gear 4 is in a non-rotating state, and the power output The second input end is through the outer gear ring 7, and cooperates with a number of transition gears 6 to make the combined gear frame 5 rotate. As the combined gear frame 5 rotates, under the action of the connecting key 301, the power output screw 3 is driven to rotate, so that the power output is achieved through the rotating power output screw 3. By being able to switch the power input end, the two power input ends are redundant backups for each other under the premise of ensuring that the power output ends are the same. When one of the power input ends fails, the power input can be switched in time to ensure the work is carried out. In addition, the faulty power input end can be determined according to the working state of the combined gear frame 5 driven by the inner gear 4 and the outer gear ring 7.

[0042] Combined with Figure 1-11As shown, preferably, the box body 1 includes a box body warehouse portion 101, a first box body cover portion 102 and a second box body cover portion 103, the first box body cover portion 102 and the second box body cover portion 103 can be detachably installed on the box body warehouse portion 101, the space formed between the first box body cover portion 102 and the box body warehouse portion 101 is the first box body cavity, the space formed between the second box body cover portion 103 and the box body warehouse portion 101 is the second box body cavity, the combined gear frame 5 and the outer gear ring 7 are both located in the first box body cavity, the input gear portion 401 of the internal gear 4 is located in the second box body cavity, and the box body 1 adopts a splicing and assembly structure, so that the box body 1 is convenient to disassemble for internal inspection, the outer periphery of the first side cylindrical portion 502 and the outer periphery of the second side cylindrical portion 503 are both provided with gear frame bearings 9, the combined gear frame 5 is rotatably installed in the box body 1 through the gear frame bearings 9, preferably, the combined gear frame 5 is rotatably installed in the box body 1 through the gear frame bearings 9 The outer gear ring 7 is rotatably installed in the first housing cavity, an outer gear ring bearing 10 is provided at the outer peripheral edge of the outer gear ring 7, and the outer gear ring 7 is rotatably installed in the housing 1 through the outer gear ring bearing 10. Preferably, the outer gear ring 7 is rotatably installed in the first housing cavity through the outer gear ring bearing 10. An internal gear bearing 8 is provided on the input gear part 401, and the internal gear 4 is rotatably installed in the housing 1 through the internal gear bearing 8. Preferably, the internal gear bearing 8 is installed on the input gear part 401, and the input gear part 401 of the internal gear 4 is rotatably installed in the second housing cavity through the internal gear bearing 8. By arranging the gear frame bearing 9, the internal gear bearing 8 and the outer gear ring bearing 10, the installation of the combined gear frame 5, the internal gear 4 and the outer gear ring 7 in the housing 1 is realized. The central cylindrical part 501 in the combined gear frame 5 can be assembled by splicing to facilitate the installation of the transition gear 6, and the splicing connection and fixing method can be carried out by bolting.

[0043] Combined with Figure 1-11As shown, an electric actuator using the gearbox with a switchable power input end as described above comprises: a first drive motor 11, a second drive motor 12 and a power output assembly, wherein the first drive motor 11 is arranged on a housing 1, and the output end of the first drive motor 11 extends into the housing 1 and is connected to a first drive gear 111, and the first drive gear 111 is meshedly connected with an input gear portion 401, the second drive motor 12 is arranged on the housing 1, and the output end of the second drive motor 12 is connected to an input end of a clutch 13, and the output end of the clutch 13 is connected to a second drive gear 131, The second driving gear 131 is located in the housing 1 and meshed with the outer gear ring 701. The power output assembly includes a nut 14 slidably connected to the outer cylinder 2, a push rod 15 connected to the nut 14 and located in the outer cylinder 2, the nut 14 is threadedly connected to the power output screw 3, and the push rod 15 is sleeved outside the power output screw 3 and is not connected to the power output screw 3. When power is input by means of the first driving motor 11, the clutch 13 is in an energized state, the second driving motor 12 is in a brake state, and the second driving gear 131 is in a fixed state, so that the outer gear ring 7 is in a non-rotating state. In the state, the first drive motor 11 drives the internal gear 4 to rotate through the first drive gear 111, and the combined gear frame 5 is rotated through the transition gear 6. The rotating combined gear frame 5 drives the power output screw rod 3 to rotate. With the rotation of the power output screw rod 3, under the action of the threaded connection with the nut 14 and the sliding connection between the nut 14 and the outer cylinder 2, the nut 14 can move linearly, thereby driving the push rod 15 to move linearly, thereby realizing power output. Similarly, when the second drive motor 12 is used for power output, the clutch 13 is in the energized state, and the second drive The motor 12 causes the second drive gear 131 to be in a rotating state, the first drive motor 11 is in a braking state, the internal gear 4 is in a non-rotating state, and the second drive gear 131 drives the outer ring gear 7 to rotate. Under the action of the transition gear 6, the combined gear frame 5 is rotated, and the rotating combined gear frame 5 drives the power output screw 3 to rotate. With the rotation of the power output screw 3, under the action of the threaded connection with the nut 14 and the sliding connection between the nut 14 and the outer cylinder 2, the nut 14 can move linearly, thereby driving the push rod 15 to move linearly, thereby realizing power output.

[0044] Combined with Figure 1-11As shown, a position sensor compartment 17 is provided on the housing 1, and the position sensor compartment 17 is connected to the housing 1, and the power output screw 3 extends into the position sensor compartment 17. A position sensor 171 is provided in the position sensor compartment 17, and the position sensor 171 is sleeved on the outer periphery of the power output screw 3 for obtaining the number of rotations of the power output screw 3. The power output screw 3 is located on the inner surface of the outer tube 2 and adopts a trapezoidal thread. The position sensor 171 uses a number of rotation monitoring sensor, and by monitoring the number of rotations of the power output screw 3, combined with the known pitch of the thread on the power output screw 3, the distance moved by the drive nut 14 can be known to realize the monitoring of the power drive position. Due to the use of trapezoidal threads, under the action of the characteristics of the trapezoidal threads themselves, the release and check function of the push rod 15 can be realized.

[0045] The housing 1 is provided with a manual drive assembly 16, which includes a through shaft 161, a manual drive gear 162, a tightening outer cylinder 163 and a tightening pin 164. The second drive gear 131 includes a manual matching gear wheel 1312 and an outer gear ring matching gear wheel 1311. The manual matching gear wheel 1312 is coaxially connected with the outer gear ring matching gear wheel 1311, and the outer gear ring matching gear wheel 1311 is meshed with the outer gear ring 701. The through shaft 161 penetrates the housing 1 and is rotatably connected with the housing 1. The manual drive gear 162 is installed at one end of the through shaft 161 located in the housing 1. The manual drive gear 162 is meshed with the manual matching gear wheel 1312. The tightening outer cylinder 163 is installed outside the housing 1 and is sleeved outside the through shaft 161. The cylinder 163 and the through shaft 161 located outside the housing 1 are both provided with tightening pin insertion holes, and the tightening pin 164 can be inserted into the tightening outer cylinder 163 and the tightening pin insertion holes on the through shaft 161 at the same time. By setting the manual drive component 16, when the clutch 13 is in the power-off state, the clutch 13 no longer performs the power transmission function. At this time, by rotating the through shaft 161, the manual driving gear 162 and the manual matching gear 1312 are used to realize the power input to the outer ring gear 7, so as to increase a power input mode and further improve the reliability of the entire mechanism. By setting the tightening pin 164, it is possible to choose whether to limit the rotation of the manual driving gear 162 according to actual usage. Preferably, the through shaft 161 located outside the housing 1 is provided with a rotating handle to facilitate the rotation of the through shaft 161.

[0046] Working principle: When in use, with the help of the first drive motor 11 as the power input end, the clutch 13 is energized, and the second drive motor 12 is in a brake state. At this time, the tightening pin 164 can be in a state of limiting the through-shaft 161, or in a state of not limiting the through-shaft 161. The first drive motor 11 drives the internal gear 4 to rotate, and the combined gear frame 5 rotates through the transition gear 6, thereby driving the power output screw rod 3 to rotate. The rotating power output screw rod 3 causes the nut 14 to move linearly. When the second drive motor 12 is used as the power input end, the clutch 13 is in a energized state, and the first drive motor 11 is in a brake state. Under the power transmission action of the clutch 13, the second The driving motor 12 drives the second driving gear 131 to rotate, the outer ring gear 7 rotates, and the combined gear frame 5 rotates through the transition gear 6, thereby driving the power output screw 3 to rotate, and the rotating power output screw 3 causes the nut 14 to move linearly. When the manual drive component 16 is used as the power input end, the clutch 13 is in a power-off state, and the first driving motor 11 is in a braking state. The through-shaft 161 is rotated, and the outer ring gear 7 is rotated through the manual driving gear 162 and the manual matching gear wheel 1312, and the combined gear frame 5 is rotated through the transition gear 6, thereby driving the power output screw 3 to rotate, and the rotating power output screw 3 causes the nut 14 to move linearly.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description in the specification are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A gearbox with a switchable power input end, comprising: The housing (1), the gear assembly and the power output assembly are characterized by: The power output assembly comprises an outer cylinder (2) and a power output screw (3), wherein the outer cylinder (2) is mounted on the housing (1), the power output screw (3) is arranged in the outer cylinder (2) and one end of the power output screw (3) extends into the housing (1), and the gear assembly is mounted in the housing (1); The gear assembly comprises an internal gear (4), a combined gear frame (5), N transition gears (6) and an outer gear ring (7); the combined gear frame (5) is a rotating body structure having a central axis and taking the central axis as a rotation axis; the internal gear (4), the combined gear frame (5) and the outer gear ring (7) are installed in the housing (1) with the common central axis; the internal gear (4) comprises an input gear portion (401) and a transmission gear portion (403); the input gear portion (401) is used for driving connection with an external power input end; the input gear portion (401) and the transmission gear portion (403) are connected to each other. The gear portion (403) is distributed along the central axis, a gear frame through-opening (506) is provided in the middle of the combined gear frame (5) along the central axis, N transition gear mounting grooves (504) are uniformly provided on the combined gear frame (5) along the circumferential direction with the central axis as a reference, the N transition gears (6) are installed one by one in the N transition gear mounting grooves (504), an inner gear ring (702) is provided on the inner surface of the outer gear ring (7), an outer gear ring (701) is provided on the outer surface of the outer gear ring (7), and the outer gear ring (701) is used for driving connection with the external power input end two; The transmission gear portion (403) of the internal gear (4) is located in the gear frame through-hole (506) and is meshedly connected with each of the N transition gears (6); the outer gear ring (7) is mounted on the outside of the combined gear frame (5) and the inner gear ring (702) is meshedly connected with each of the N transition gears (6); The internal gear (4) is provided with an internal gear through-hole (404) along the central axis, the power output screw rod (3) extends to one end of the housing (1) and passes through the internal gear through-hole (404) and the gear rack through-hole (506), and the power output screw rod (3) passes through the internal gear through-hole (404) and is located at the gear rack through-hole (506) and is fixedly connected to the combined gear rack (5) via a connecting key (301); When power is inputted via the power input end 1, the power input end 2 is braked so that the outer gear ring (7) is in a non-rotating state, and the inner gear (4) drives the combined gear frame (5) to rotate via the N transition gears (6), thereby driving the power output screw rod (3) to rotate for power output. When power is inputted via the power input end 2, the power input end 1 is braked so that the inner gear (4) is in a non-rotating state, and the outer gear ring (7) drives the combined gear frame (5) to rotate via the N transition gears (6), thereby driving the power output screw rod (3) to rotate for power output.

2. A gearbox with switchable power input end according to claim 1, characterized in that: The combined gear rack (5) comprises a central cylindrical portion (501), a first side cylindrical portion (502) and a second side cylindrical portion (503); the first side cylindrical portion (502), the central cylindrical portion (501) and the second side cylindrical portion (503) are sequentially connected along the central axis; the gear rack through-opening (506) is opened on the first side cylindrical portion (502), the central cylindrical portion (501) and the second side cylindrical portion (503) along the central axis; and N transition gear mounting grooves (504) are opened on the circumference of the central cylindrical portion (501).

3. A gearbox with switchable power input end according to claim 2, characterized in that: The transition gear (6) comprises a transition gear middle shaft (601), a transition gear needle roller bearing (603) and a transition gear tooth wheel (602) passing through the middle, a middle shaft mounting hole (505) is provided in the transition gear mounting groove (504), the transition gear middle shaft (601) is mounted in the middle shaft mounting hole (505) in the corresponding transition gear mounting groove (504), and the transition gear tooth wheel (602) is sleeved on the corresponding transition gear middle shaft (601) via the transition gear needle roller bearing (603).

4. A gearbox with switchable power input end according to claim 1, characterized in that: The connection between the input gear part (401) and the transmission gear part (403) includes a connecting column (402); the internal gear through-hole (404) is opened along the central axis in the input gear part (401), the connecting column (402) and the transmission gear part (403); a plurality of connecting column needle roller bearings (405) are arranged on the outer periphery of the connecting column (402); the connecting column (402) is rotatably connected to the gear frame through-hole (506) via the connecting column needle roller bearings (405).

5. A gearbox with switchable power input end according to claim 2, characterized in that: Gear rack bearings (9) are provided on the outer periphery of the first side cylindrical portion (502) and the outer periphery of the second side cylindrical portion (503), and the combined gear rack (5) is rotatably mounted in the housing (1) via the gear rack bearings (9).

6. A gearbox with switchable power input end according to claim 1, characterized in that: An outer gear ring bearing (10) is provided at the outer peripheral edge of the outer gear ring (7), and the outer gear ring (7) is rotatably mounted in the housing (1) via the outer gear ring bearing (10).

7. A gearbox with switchable power input end according to claim 1, characterized in that: The input gear part (401) is provided with an internal gear bearing (8), and the internal gear (4) is rotatably mounted in the housing (1) via the internal gear bearing (8).

8. An electric actuator using a gearbox with a switchable power input end as claimed in any one of claims 1 to 7, comprising: The first drive motor (11), the second drive motor (12) and the power output assembly are characterized by: The first drive motor (11) is arranged on the box (1); the output end of the first drive motor (11) extends into the box (1) and is connected to a first drive gear (111); the first drive gear (111) is meshedly connected to the input gear part (401); The second drive motor (12) is arranged on the housing (1); the output end of the second drive motor (12) is connected to the input end of the clutch (13); the output end of the clutch (13) is connected to the second drive gear (131); the second drive gear (131) is located inside the housing (1) and is meshed with the outer gear ring (701); The power output assembly comprises a nut (14) slidably connected to the outer cylinder (2), and a push rod (15) connected to the nut (14) and located in the outer cylinder (2); the nut (14) is threadedly connected to the power output screw rod (3); and the push rod (15) is sleeved outside the power output screw rod (3) and is not connected to the power output screw rod (3).

9. The electric actuator according to claim 8, characterized in that: A position sensor compartment (17) is provided on the housing (1), the position sensor compartment (17) is communicated with the housing (1), the power output screw rod (3) extends into the position sensor compartment (17), a position sensor (171) is provided in the position sensor compartment (17), the position sensor (171) is sleeved on the outer periphery of the power output screw rod (3) for obtaining the number of rotations of the power output screw rod (3), and the surface of the inner part of the power output screw rod (3) located in the outer cylinder (2) adopts a trapezoidal thread.

10. The electric actuator according to claim 8, characterized in that: The housing (1) is provided with a manual drive assembly (16), the manual drive assembly (16) comprising a through shaft (161), a manual drive gear (162), a tightening outer cylinder (163) and a tightening pin (164); the second drive gear (131) comprises a manual mating gear wheel (1312) and an outer gear ring mating gear wheel (1311); the manual mating gear wheel (1312) and the outer gear ring mating gear wheel (1311) are coaxially connected; the outer gear ring mating gear wheel (1311) is meshedly connected with the outer gear ring (701); the through shaft (161) passes through the housing (1) and is rotatably connected to the housing (1); the manual drive gear (162) is mounted on one end of the through-shaft (161) located inside the housing (1); the manual drive gear (162) is meshedly connected with the manual matching gear wheel (1312); the tightening outer cylinder (163) is mounted outside the housing (1) and sleeved outside the through-shaft (161); the tightening outer cylinder (163) and the through-shaft (161) located outside the housing (1) are both provided with tightening pin insertion holes; the tightening pin (164) can be simultaneously inserted into the tightening pin insertion holes on the tightening outer cylinder (163) and the through-shaft (161).

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