Double-margin servo electric cylinder

Abstract

The invention aims at the technical field of mechanical transmission, and provides a double-margin servo electric cylinder which comprises a first motor, a second motor, a shell component, a transmission component and a lead screw. A first motor and a second motor are fixedly connected to the bottom surface of the shell part in parallel; a transmission component is arranged in the shell component; the bottom face of the shell part is axially and movably connected with a lead screw. An original single-motor transmission mode is broken through, double-motor input is adopted, output power is effectively guaranteed, and the safety margin of product operation can be greatly improved; the double-margin servo electric cylinder has the advantages of being compact in structure, high in universality and capable of being quickly reconfigured.

Description

Technical Field

[0001] The invention relates to a double-margin servo electric cylinder, belonging to the technical field of mechanical transmission. Background Art

[0002] For conventional servo electric cylinders, the basic structure generally has an input structure and an output structure. The input structure is usually an input shaft, which is responsible for receiving the rotational force of an external power source (such as an electric motor) and transmitting it to the gear system inside the servo electric cylinder. The output structure outputs the power of the servo electric cylinder after speed conversion to the required equipment or mechanical device through the output shaft. With the technological development of servo electric cylinders, more and more servo electric cylinders have replaced the original hydraulic cylinders and cylinders. The servo electric cylinder has many advantages such as small size, high precision, and low cost. The Chinese invention patent with patent number CN202120511605.2 discloses a servo electric cylinder, which has a reducer between the servo motor and the screw rod to reduce the speed to increase the torque, thereby increasing the torque, and can adapt to occasions with large torque.

[0003] However, the inventors of the present invention discovered that the technology has the following problems: with the widespread use of servo electric cylinders, the frequency of use of servo electric cylinders in aerospace and major projects has also been greatly improved accordingly. Since such projects are often in outer space or special fields, extremely high safety requirements are placed on products. After a failure occurs, the motor cannot be repaired or replaced in time, and stable quality cannot be provided for such projects. As a result, many projects have suffered losses of hundreds of millions due to motor failures. Therefore, improvements are needed. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a dual-margin servo electric cylinder, which adopts dual-motor input and can greatly improve the safety margin of the product by changing the internal transmission structure.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a dual-margin servo electric cylinder, comprising a first motor, a second motor, a housing component, a transmission component and a lead screw; the first motor and the second motor are fixedly connected in parallel on the bottom surface of the housing component; the transmission component is arranged inside the housing component; and the lead screw is connected to the bottom surface of the housing component for axial movement.

[0007] The shell component comprises a lower shell and an upper shell; the upper shell is fixedly connected to the lower shell by screws.

[0008] The transmission components include a differential inner ring gear support bearing, a differential inner ring gear, a differential planetary carrier and a differential sun gear component, a second motor gear, a first motor gear, and fasteners; the first motor output shaft passes through the lower housing and is key-connected to the first motor gear; the second motor output shaft passes through the lower housing and is fixedly connected to the second motor gear through fasteners.

[0009] The transmission components also include a differential planetary carrier and a differential sun gear component; the differential inner gear ring is rotatably connected to the lower housing through a differential inner gear ring support bearing; the differential sun gear component is inserted into the differential planetary carrier and then integrally installed in the differential inner gear ring; the outer tooth surface of the differential inner gear ring is meshedly connected with the outer gear of the second motor.

[0010] The differential planet carrier comprises a differential planetary gear and an intermediate gear; the side surface of the intermediate gear is rotatably connected with the differential planetary gear through a screw annular array; the differential planetary gear is meshedly connected with the internal tooth surface of the differential inner gear ring.

[0011] The differential sun gear component includes a large differential sun gear, a small differential sun gear and a differential sun gear shaft; the large differential sun gear is coaxially fixedly connected to the upper part of the differential sun gear shaft; the small differential sun gear is coaxially fixedly connected to the lower part of the differential sun gear shaft; the small differential sun gear is simultaneously meshed and connected with the differential planetary gears of the annular array; the differential sun gear shaft is meshed and connected with the first motor gear.

[0012] The transmission component also includes a third bearing, an output gear, a fourth bearing and a ball nut; the ball nut is rotatably sleeved on the lead screw; the third bearing and the fourth bearing are rotatably connected at both ends of the ball nut; the output gear is connected to the output gear with a middle key of the ball nut; and the output gear is keyed to the middle gear.

[0013] The beneficial effects of the present invention are: breaking the original single-motor transmission form and adopting dual-motor input not only effectively guarantees the output power, but also greatly improves the safety margin of product operation; and the dual-margin servo electric cylinder has the advantages of compact structure, strong versatility and rapid reconfiguration. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural exploded diagram of the present invention;

[0015] Figure 2 It is the internal structure diagram of the present invention;

[0016] Figure 3 It is a structural diagram of the differential internal gear ring in the present invention;

[0017] Figure 4 This is a structural diagram of a differential planet carrier in the present invention;

[0018] Figure 5 It is a structural diagram of the differential sun gear component in the present invention.

[0019] In the figure: 1-first motor, 2-second motor, 3-lower housing, 4-differential inner ring gear support bearing, 5-differential inner ring gear, 6-second motor gear, 7-differential sun gear support bearing, 8-differential planetary gear, 9-fastener, 10-differential planetary carrier, 11-differential sun gear component, 12-first motor gear, 13-upper housing, 14-third bearing, 15-output gear, 16-fourth bearing, 17-ball nut, 18-intermediate gear, 19-housing component, 20-large differential sun gear, 21-small differential sun gear, 22-differential sun gear shaft, 23-transmission component, 24-screw. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0021] The first embodiment of the present invention relates to Figure 1-5 A dual-margin servo electric cylinder shown in the figure comprises a first motor 1, a second motor 2, a housing component 19, a transmission component 23 and a lead screw 24; the first motor 1 and the second motor 2 are fixedly connected in parallel on the bottom surface of the housing component 19; the transmission component 23 is arranged inside the housing component 19; the lead screw 24 is connected to the bottom surface of the housing component 19 for axial movement. The first motor 1 and the second motor 2 simultaneously provide power input for the servo electric cylinder; the housing component 19 provides a frame and force support for the servo electric cylinder, and can protect the transmission component 23 from damage and contamination by external forces; the transmission component 23 transmits the power of the first motor and the second motor 2 to the lead screw 24 through mechanical transmission.

[0022] The housing component 19 includes a lower housing 3 and an upper housing 13; the upper housing 13 is fixedly connected to the lower housing 3 by screws. A lifting lug is provided on the upper surface of the upper housing 13 to facilitate the installation of the servo cylinder; the lower housing 3 and the upper housing 13 can form a closed cavity after being attached to each other, which is used to install the transmission component 23.

[0023] The second embodiment of the present invention is basically the same as the first embodiment, mainly in that the scheme of the transmission component is optimized. The transmission component 23 includes a differential inner ring gear support bearing 4, a differential inner ring gear 5, a differential planetary carrier 10 and a differential sun gear component 11, a second motor gear 6, a first motor gear 12, and a fastener 9; the output shaft of the first motor 1 passes through the lower housing 3 and is key-connected with the first motor gear 12; the output shaft of the second motor 2 passes through the lower housing 3 and is fixedly connected with the second motor gear 6 through the fastener 9. The differential inner ring gear support bearing 4 can ensure the smooth rotation of the differential inner ring gear 5; the differential inner ring gear 5 is an annular gear ring, and its inner ring is provided with an internal tooth surface, and the outer ring is provided with an external tooth surface; the second motor gear 6 is used to transmit the rotational power of the second motor 2; the first motor gear 12 is used to transmit the rotational power of the first motor 1; the fastener 9 is used to ensure that the second motor gear 6 rotates synchronously with the second motor 2.

[0024] The transmission component 23 also includes a differential planet carrier 10 and a differential sun gear component 11; the differential inner gear ring 5 is rotatably connected to the lower housing 3 through the differential inner gear ring support bearing 4; the differential sun gear component 11 is inserted into the differential planet carrier 10 and then installed in the differential inner gear ring 5 as a whole; the outer tooth surface of the differential inner gear ring 5 is externally meshed with the second motor gear 6. The rotation of the differential planet carrier 10 can drive the rotation of the intermediate gear 18, and then drive the rotation of the output gear 15, and finally drive the lead screw 24 to reciprocate; the differential sun gear component 11 plays a bridge role in the process of the first motor 1 transmitting power to the output gear 15.

[0025] The differential planetary carrier 10 includes a differential planetary gear 8 and an intermediate gear 18; the side of the intermediate gear 18 is rotatably connected to the differential planetary gear 8 through a screw annular array; the differential planetary gear 8 is meshed with the internal tooth surface of the differential inner gear ring 5. The differential planetary gear 8 is meshed with the small differential sun gear 21 while being meshed with the differential inner gear ring 5, that is, it can accept power input from both the first motor 1 and the second motor 2.

[0026] The differential sun gear component 11 includes a large differential sun gear 20, a small differential sun gear 21 and a differential sun gear shaft 22; the large differential sun gear 20 is coaxially fixedly connected to the upper part of the differential sun gear shaft 22; the small differential sun gear 21 is coaxially fixedly connected to the lower part of the differential sun gear shaft 22; the small differential sun gear 21 is meshed and connected with the differential planetary gears 8 of the annular array at the same time; the differential sun gear shaft 22 is meshed and connected with the first motor gear 12. The sun gear shaft 22 plays the role of force support and rotation support for the large differential sun gear 20 and the small differential sun gear 21; the large differential sun gear 20 is driven by the first motor gear 12; the small differential sun gear 21 is driven by the differential inner gear ring 5.

[0027] The transmission component 23 also includes a third bearing 14, an output gear 15, a fourth bearing 16 and a ball nut 17; the ball nut 17 is rotatably sleeved on the lead screw 24; the third bearing 14 and the fourth bearing 16 are rotatably connected at both ends of the ball nut 17; the output gear 15 is connected to the middle gear 18 by a key. The third bearing 14 and the fourth bearing 16 are used to ensure that the ball nut 17 rotates smoothly; the output gear 15 drives the ball nut 17 to rotate synchronously; the rotation of the ball nut 17 drives the lead screw 24 to reciprocate axially.

[0028] Based on the above, a typical working process of the present invention is:

[0029] like Figure 1-5As shown, when the present invention is implemented, the first motor 1 and the second motor 2 are powered on at the same time. Under normal circumstances, the first motor 1 serves as the main drive port, and the second motor 2 is in a brake state. The first motor 1 rotates to drive the first motor gear 12 and the differential sun gear component 11 to move. When the differential sun gear component 11 rotates, the differential planetary gear 8 also moves synchronously, thereby driving the differential planetary carrier 10 to rotate. Since there is an intermediate gear 18 on the differential planetary carrier 10 and it is meshed with the output gear 15, the output gear 15 rotates at a designed speed, driving the lead screw 24 to reciprocate, thereby realizing the final required action. When the first motor 1 fails, the first motor 1 can be powered off by program control, so that the first motor 1 is braked, the second motor 2 is started synchronously, the second motor 2 is driven to run, and the second motor gear 6 is driven to rotate, so that the differential inner gear ring 5 starts to rotate. Since the first motor 1 is in the brake state, the first motor gear 12 and the large differential sun gear 20 connected to it cannot rotate and become fixed parts, so as to ensure that the differential inner gear ring 5 can drive the differential planet carrier 10 to move synchronously when it moves, and finally drive the lead screw 24 to reciprocate through the output gear 15. This greatly improves the safety margin of this type of product and ensures the smooth progress of the project.

Claims

1. A dual-margin servo electric cylinder, characterized in that: The invention comprises a first motor (1), a second motor (2), a housing component (19), a transmission component (23) and a lead screw (24); the first motor (1) and the second motor (2) are fixedly connected in parallel on the bottom surface of the housing component (19); the transmission component (23) is arranged inside the housing component (19); and the lead screw (24) is axially movable on the bottom surface of the housing component (19).

2. The dual margin servo electric cylinder according to claim 1, characterized in that: The housing component (19) comprises a lower housing (3) and an upper housing (13); the upper housing (13) is fixedly connected to the lower housing (3) by means of screws.

3. The dual margin servo electric cylinder according to claim 1, characterized in that: The transmission component (23) comprises a differential inner gear ring support bearing (4), a differential inner gear ring (5), a differential planetary carrier (10), a differential sun gear component (11), a second motor gear (6), a first motor gear (12), and a fastener (9); the output shaft of the first motor (1) passes through the lower housing (3) and is key-connected to the first motor gear (12); the output shaft of the second motor (2) passes through the lower housing (3) and is fixedly connected to the second motor gear (6) via a fastener (9).

4. The dual margin servo electric cylinder according to claim 3, characterized in that: The transmission component (23) also includes a differential planetary carrier (10) and a differential sun gear component (11); the differential inner gear ring (5) is rotatably connected to the lower housing (3) via a differential inner gear ring support bearing (4); the differential sun gear component (11) is inserted into the differential planetary carrier (10) and then integrally installed in the differential inner gear ring (5); the external tooth surface of the differential inner gear ring (5) is externally meshed with the second motor gear (6).

5. The dual margin servo electric cylinder according to claim 4, characterized in that: The differential planetary carrier (10) comprises a differential planetary gear (8) and an intermediate gear (18); the side surface of the intermediate gear (18) is rotatably connected to the differential planetary gear (8) via a screw annular array; the differential planetary gear (8) is meshingly connected to the internal tooth surface of the differential inner gear ring (5).

6. The dual margin servo electric cylinder according to claim 4, characterized in that: The differential sun gear component (11) comprises a large differential sun gear (20), a small differential sun gear (21) and a differential sun gear shaft (22); the upper portion of the differential sun gear shaft (22) is coaxially fixedly connected to the large differential sun gear (20); the lower portion of the differential sun gear shaft (22) is coaxially fixedly connected to the small differential sun gear (21); the small differential sun gear (21) is meshedly connected to the differential planetary gears (8) of the annular array at the same time; and the differential sun gear shaft (22) is meshedly connected to the first motor gear (12).

7. The dual margin servo electric cylinder according to claim 3, characterized in that: The transmission component (23) further comprises a third bearing (14), an output gear (15), a fourth bearing (16) and a ball nut (17); the ball nut (17) is rotatably sleeved on the lead screw (24); the third bearing (14) and the fourth bearing (16) are rotatably connected at both ends of the ball nut (17); the output gear (15) is connected to the middle of the ball nut (17) by a key; and the output gear (15) is key-connected to the middle gear (18).

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