A differential device for sleeve deployment

Abstract

The present invention discloses a differential device for sleeve deployment, comprising a first connecting seat, in which a differential force component is integrated; motion modules symmetrically arranged at the upper and lower ends of the first connecting seat and fixedly connected to the first connecting seat, wherein the output ends of the differential force component are respectively connected to the input ends of the motion modules at the corresponding ends; and a power component; the power component is integrated on one side of the lower motion module, and the output end of the power component is connected to the output end of the differential force component to drive the differential force component to move. The differential device of the present invention has a simple structure and high reliability, can significantly increase the effective contact force of the drive component, or can significantly increase the axial effective deployment driving force of the sleeve component, and can be used in all occasions for driving sleeve deployment, especially differential devices in the field of space remote sensing where high deployment accuracy is required.

Description

Technical Field

[0001] The present invention relates to the technical field of variable structure space remote sensors, and in particular to a differential device used for sleeve deployment, which is used to complete effective differential pre-tightening or differential driving between a drive assembly and an inner wall of the sleeve during the sleeve deployment process, thereby realizing the on-orbit reorganization of an ultra-large variable structure space remote sensor. Background Art

[0002] To overcome launch capacity limitations and build larger-aperture space sensors in orbit, deployable space sensors have become a new development direction. The basic principle of this technology is to systematically fold the system to reduce its footprint before launch. Once in orbit, it automatically unfolds and reassembles, achieving imaging capabilities equivalent to the designed aperture. Deployable space sensors require a deployment mechanism to achieve their desired shape. Traditional deployment mechanisms include articulated trusses, thin-walled tubes, sleeves, coils, and inflatables.

[0003] The telescopic type has good stiffness and strength performance due to the large moment of inertia of the cylinder section and the certain length of overlap retained between each two-stage cylinder. By using carbon fiber materials with a small linear expansion coefficient and mechanical limit devices, high positioning accuracy can be achieved. It is particularly suitable for the field of variable structure space cameras that require high accuracy, stability and stiffness.

[0004] Depending on the method of sleeve deployment, it can be categorized as rope-driven, screw-driven, and thin-walled open-tube-driven. Rope-driven systems offer advantages such as good deployment synchronization, simple structure and principle, and lightweight drive components. However, in microgravity, the ropes present the risk of entanglement, resulting in low reliability. The elasticity of the ropes can cause oscillations during the deployment process, making system control difficult. Screw-driven systems offer significant advantages such as a simple principle, stable structure, high strength, and high deployment driving force. However, they require very high screw machining precision and nut assembly accuracy. Limited by screw manufacturing capacity, the sleeve cannot achieve a very long single-stage extension length, resulting in a relatively low deployment-folding ratio. Screw-driven systems are prone to bending and deformation, leading to mechanism jamming and low reliability. Thin-walled open-tube-driven systems offer a high axial driving force. However, their deployment and retraction mechanisms are complex, heavy, and inconvenient. Asymmetrical deformation of the thin-walled open-tube after deployment can cause axial rotation of the sleeve, squeezing the guide mechanism and causing deformation of the deployment mechanism. Furthermore, manufacturing thin-walled open-tube systems with long travels is difficult and costly.

[0005] Based on the above technical problems, technical personnel in this field urgently need to develop a differential device for sleeve deployment, which is used to complete effective differential pre-tightening or differential driving of the drive assembly and the inner wall of the sleeve during the sleeve deployment process, and realize the on-orbit reorganization of the ultra-large variable structure space remote control sensor. Summary of the Invention

[0006] The purpose of the present invention is to provide a differential device with a simple structure and high reliability, which can greatly improve the effective contact force of the drive assembly or greatly improve the axial effective deployment driving force of the sleeve assembly, and can be used in all occasions of driving the sleeve to deploy, especially in the field of space remote sensing where high deployment accuracy is required.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A differential device for sleeve deployment according to the present invention includes:

[0009] a first connecting seat, wherein a differential force component is integrated in the first connecting seat;

[0010] Motion modules are symmetrically arranged at the upper and lower ends of the first connecting seat and fixedly connected to the first connecting seat, and the output end of the differential force component is respectively connected to the input end of the motion module at the corresponding end; and

[0011] Power components;

[0012] The two motion modules are divided into an upper motion module located at the upper end of the first connecting seat and a lower motion module located at the lower end of the first connecting seat;

[0013] The power assembly is integrated at one side of the lower motion module, and the output end of the power assembly is connected to the output end of the differential force component to drive the differential force component to move.

[0014] Furthermore, the motion module includes:

[0015] a base assembly fixedly connected to the first connecting base;

[0016] A plurality of synchronous transmission assemblies axially symmetrically distributed on the base assembly and rotatably connected to the base assembly;

[0017] A plurality of second bevel gears are axially symmetrically distributed on the base assembly and mesh with the corresponding synchronous transmission assembly, and one end of the second bevel gear is fixedly connected to the first straight gear;

[0018] The center of the base assembly is rotatably connected to a second spur gear that meshes with the plurality of first spur gears;

[0019] The middle portion of the second bevel gear is rotatably connected to the base assembly.

[0020] Furthermore, the base assembly includes:

[0021] a mounting base ring, wherein the second spur gear is rotatably connected to the mounting base ring;

[0022] a bearing cap fixedly connected to the lower end surface of the mounting base ring; and

[0023] A split mounting seat is axially symmetrically arranged on the upper end surface of the mounting base ring, and the axial holes of the split mounting seat are coaxially arranged.

[0024] Furthermore, the synchronous transmission assembly includes:

[0025] A second small shaft, the second small shaft is rotatably connected to the shaft hole of the split mounting seat, and a synchronous pulley is processed in the middle of the second small shaft;

[0026] Support arms are symmetrically arranged and connected to both ends of the center of the second small shaft, and one end of the support arm away from the second small shaft is rotatably connected to the first small shaft;

[0027] The middle part of the first small shaft is rotatably connected to a synchronous pulley, and the two sides of the synchronous pulley at this end are sleeved and fixed with driving wheels;

[0028] The left side of the second small shaft is fixedly connected with a first bevel gear;

[0029] A synchronous belt is connected between the synchronous pulley and the synchronous pulley processed on the middle part of the second small shaft;

[0030] Furthermore, the differential device is configured as a differential drive device or a differential preload device;

[0031] When the differential device is a differential drive device, the support arm is rotatably connected to the second small shaft;

[0032] When the differential device is a differential preload device, the support arm is fixedly connected to the second small shaft. As an expanded implementation, when the differential device is a differential preload device, the synchronous belt and the drive wheel can be removed.

[0033] Furthermore, the differential force component includes:

[0034] A differential shaft, wherein a plurality of small transverse shafts protrude outward from the differential shaft, the upper end of the differential shaft is rotatably connected to the third bevel gear, and the lower end of the differential shaft is rotatably connected to the fifth bevel gear;

[0035] a fourth bevel gear rotatably connected to the corresponding small transverse shaft;

[0036] The third bevel gear is meshed with the plurality of fourth bevel gears;

[0037] The fifth bevel gear is meshed with the plurality of fourth bevel gears;

[0038] The third bevel gear is fixedly connected to the second spur gear of the motion module located above the first connecting seat, and the fifth bevel gear is fixedly connected to the second spur gear of the motion module located below the first connecting seat.

[0039] Furthermore, the power assembly includes:

[0040] a second connecting seat fixedly connected to the motion module below the first connecting seat, the second connecting seat having claws uniformly distributed along the periphery of the motion module and extending toward one end of the first connecting seat;

[0041] A motor assembly integrated in the center of the lower end of the second connecting seat, wherein a coupling is installed at the output end of the motor assembly;

[0042] The motor assembly is connected to the differential shaft through the coupling.

[0043] In the above technical solution, the present invention provides a differential device for sleeve deployment, which has the following beneficial effects:

[0044] The differential device of the present invention can form a differential preload device or a differential drive device by adjusting the connection relationship between the second small shaft and the support arm; when used as a differential preload device, a single power source is used to achieve variable diameter adaptation of multiple preload mechanisms, and the upper and lower drive components can be simultaneously in contact with the inner walls of sleeves of different diameters. It has a simple structure and high reliability, and can greatly improve the effective contact force of the drive component.

[0045] When the differential device of the present invention is used as a differential drive device, a single power source is used to realize the rotational drive of multiple drive wheels, and the speed matching of the upper and lower drive wheels on the inner walls of sleeves with different diameters or when the inner walls of sleeves with variable diameters transition is achieved. It has a simple structure and high reliability, and can greatly improve the axial effective deployment driving force of the sleeve assembly.

[0046] The differential device of the present invention can be used in all occasions where a drive sleeve is deployed, especially in the field of space remote sensing where high deployment accuracy is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0048] Figure 1 A schematic structural diagram of a differential device for sleeve deployment provided by an embodiment of the present invention;

[0049] Figure 2A front view of a differential device for sleeve deployment provided by an embodiment of the present invention;

[0050] Figure 3 A cross-sectional view of a differential device for sleeve deployment provided by an embodiment of the present invention;

[0051] Figure 4 for Figure 3 Middle AA section view.

[0052] Description of reference numerals:

[0053] A. Differential force component; B. Base component; C. Synchronous transmission component; D. Power component;

[0054] 1. Synchronous belt; 2. Synchronous pulley; 3. First small shaft; 4. Support arm; 5. Drive wheel; 6. First bevel gear; 7. Second small shaft; 8. Split mounting seat; 9. Second bevel gear; 10. Mounting base ring; 11. Bearing cover; 12. First spur gear; 13. Second spur gear; 14. First locking nut; 15. Third bevel gear; 16. Fourth bevel gear; 17. Second locking nut; 18. Differential shaft; 19. First connecting seat; 20. Second connecting seat; 21. Coupling; 22. Motor assembly; 23. Fifth bevel gear. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0056] See also Figures 1 to 4 As shown;

[0057] A differential device for sleeve deployment according to this embodiment includes:

[0058] A first connecting seat 19, wherein a differential force component A is integrated into the first connecting seat 19;

[0059] The motion modules are symmetrically arranged at the upper and lower ends of the first connecting seat 19 and fixedly connected to the first connecting seat 19, and the output end of the differential force component A is respectively connected to the input end of the motion module at the corresponding end; and

[0060] Power assembly D;

[0061] The two motion modules are divided into an upper motion module located at the upper end of the first connecting seat 19 and a lower motion module located at the lower end of the first connecting seat;

[0062] The power assembly D is integrated on one side of the lower motion module, and the output end of the power assembly D is connected to the output end of the differential force component A to drive the differential force component A to move.

[0063] Preferably, the motion module of this embodiment includes:

[0064] A base assembly B fixedly connected to the first connecting base 19;

[0065] A plurality of synchronous transmission components C axially symmetrically distributed on the base component B and rotatably connected to the base component B;

[0066] A plurality of second bevel gears 9 are axially symmetrically distributed on the base assembly B and mesh with the corresponding synchronous transmission assembly C. One end of the second bevel gear 9 is fixedly connected to the first spur gear 12;

[0067] The center of the base assembly B is rotatably connected to a second spur gear 13 that meshes with a plurality of first spur gears 12;

[0068] The middle position of the second bevel gear 9 is rotatably connected to the base assembly B.

[0069] Secondly, the base assembly B includes:

[0070] The mounting base ring 10, the second spur gear 13 is rotatably connected to the mounting base ring 10;

[0071] A bearing cap 11 fixedly connected to the lower end surface of the mounting base ring 10; and

[0072] The split mounting seat 8 is axially symmetrically arranged on the upper end surface of the mounting base ring 10, and the axial holes of the split mounting seat 8 are coaxially arranged.

[0073] Preferably, the synchronous transmission assembly C of this embodiment includes:

[0074] The second small shaft 7 is rotatably connected to the shaft hole of the split mounting seat 8, and a synchronous pulley is processed in the middle of the second small shaft 7;

[0075] Support arms 4 are symmetrically arranged and connected to both ends of the center of the second small shaft 7, and one end of the support arm 4 away from the second small shaft 7 is rotatably connected to the first small shaft 3;

[0076] The middle part of the first small shaft 3 is rotatably connected to the synchronous pulley 2, and the two sides of the synchronous pulley 2 at this end are sleeved and fixed with driving wheels 5;

[0077] The left side of the second small shaft 7 is fixedly connected with the first bevel gear 6;

[0078] A synchronous belt 1 is connected between the synchronous pulley 2 and the synchronous pulley processed in the middle of the second small shaft 7.

[0079] The differential device of this embodiment is configured as a differential drive device or a differential preload device; depending on the use requirements, the differential device of this embodiment can be used as a differential drive device or a differential preload device. Specifically:

[0080] When the differential device is a differential drive device, the support arm 4 is rotationally connected to the second small shaft 7;

[0081] When the differential device is a differential preload device, the support arm 4 is fixedly connected to the second small shaft 7. As an expanded implementation, when the differential device is a differential preload device, the synchronous belt 1 and the drive wheel 5 can be removed.

[0082] Furthermore, the differential force component A of this embodiment includes:

[0083] The differential shaft 18 has multiple small horizontal shafts protruding outward from the differential shaft 18. The upper end of the differential shaft 18 is rotatably connected to the third bevel gear 15, and the lower end of the differential shaft 18 is rotatably connected to the fifth bevel gear 23;

[0084] A fourth bevel gear 16 rotatably connected to the corresponding small transverse shaft;

[0085] The third bevel gear 15 is meshed with a plurality of fourth bevel gears 16;

[0086] The fifth bevel gear 23 meshes with the plurality of fourth bevel gears 16;

[0087] The third bevel gear 15 is fixedly connected to the second spur gear 13 of the motion module located above the first connecting seat 19 , and the fifth bevel gear 23 is fixedly connected to the second spur gear 13 of the motion module located below the first connecting seat 19 .

[0088] Finally, the power assembly D of this embodiment includes:

[0089] A second connecting base 20 fixedly connected to the motion module located below the first connecting base 19, the second connecting base 20 having claws evenly distributed along the periphery of the motion module and extending toward one end of the first connecting base 19;

[0090] A motor assembly 22 is integrated into the center of the lower end of the second connecting base 20, and a coupling 21 is installed at the output end of the motor assembly 22;

[0091] The motor assembly 22 is connected to the differential shaft 18 via a coupling 21 .

[0092] When the differential device of this embodiment is used as a differential drive device, the drive wheels 5, driven by other mechanisms, are already in effective contact with the inner wall of the sleeve. At this point, the motor assembly 22 outputs power, and the rotation of its output first enters the differential force component A. Due to the properties of the differential force component A, the sum of the rotational speeds of the third bevel gear 15 and the fifth bevel gear 23 is twice the speed of the differential shaft 18. Based on the aforementioned transmission properties, the rotation is transmitted to each drive wheel 5 via the second spur gear 13, the first spur gear 12, the second bevel gear 9, the first bevel gear 6, the second pinion 7, the synchronous belt 1, and the synchronous pulley 2. When the contact states between the upper and lower drive wheels 5 and the inner wall of the sleeve differ, the differential force component A automatically achieves speed matching. Based on this principle, different drive wheels 5 can achieve different speed matching when moving on the inner surface of a sleeve with a stepped, irregular, or discontinuous inner diameter variation, ensuring a stable and reliable axial deployment force throughout the entire sleeve deployment process.

[0093] When the differential device of this embodiment is used as a differential preload device, according to the above-mentioned power transmission path, when the output rotation of the power component D is transmitted to the second small shaft 7, since the second small shaft 7 is fixedly connected to the support arm F, the rotation of the power component D is converted into an opening and closing movement of the support arm 4 around the second small shaft 7. This movement can enable the driving wheel 5 installed on the support arm 4 to effectively contact the inner surface of the sleeve with a stepped or irregular, non-continuous inner diameter change. Calculating the degrees of freedom reveals that, in the initial state, when neither drive wheel 5 contacts the inner wall of the sleeve, the mechanism has a degree of freedom of 2, representing an underdriven mechanism. Driven by the power module D, the upper and lower support arms 4 perform an indeterminate opening motion. When either the upper or lower drive wheel 5 contacts the inner wall of the sleeve, the mechanism's degree of freedom decreases to 1, representing a fixed-path drive mechanism. Driven by the power module D, the drive wheel 5 not in contact with the inner wall of the sleeve continues to open until it contacts the inner surface of the sleeve. At this point, the driving torque of the power module D is converted into a contact force between the drive wheel 5 and the inner wall of the sleeve. When the structural parameters of the upper and lower motion modules are identical, the contact forces between the upper and lower drive wheels 5 and the inner wall of the sleeve are identical. Because the upper and lower drive wheels 5 are axially symmetrically distributed, a number greater than two provides self-centering. Due to the properties of the differential force component A, the device can adapt to the inner surface of the sleeve with stepped, or irregular, or discontinuous inner diameter changes, so that the drive wheel 5 can ensure effective contact on these variable diameter inner surfaces, thereby providing continuous positive pressure for the expansion of the sleeve, and this positive pressure is converted into an effective driving force for the expansion of the sleeve under the movement of the drive component.

[0094] In the above technical solution, the present invention provides a differential device for sleeve deployment, which has the following beneficial effects:

[0095] The differential device of the present invention can form a differential preload device or a differential drive device by adjusting the connection relationship between the second small shaft 7 and the support arm 4; when used as a differential preload device, a single power source is used to achieve variable diameter adaptation of multiple preload mechanisms, and the upper and lower drive components can be simultaneously in contact with the inner walls of sleeves of different diameters. It has a simple structure and high reliability, and can greatly improve the effective contact force of the drive component.

[0096] When the differential device of the present invention is used as a differential drive device, a single power source is used to realize the rotational drive of multiple drive wheels, and the speed matching of the upper and lower drive wheels on the inner walls of sleeves with different diameters or when the inner walls of sleeves with variable diameters transition is achieved. It has a simple structure and high reliability, and can greatly improve the axial effective deployment driving force of the sleeve assembly.

[0097] The differential device of the present invention can be used in all occasions where a drive sleeve is deployed, especially in the field of space remote sensing where high deployment accuracy is required.

[0098] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A differential device used for sleeve deployment, characterized in that: The differential device comprises: A first connecting seat (19), wherein a differential force component (A) is integrated in the first connecting seat (19); motion modules symmetrically arranged at the upper and lower ends of the first connecting seat (19) and fixedly connected to the first connecting seat (19), the output end of the differential force component (A) being connected to the input end of the motion module at the corresponding end; and Power assembly (D); The two motion modules are divided into an upper motion module located at the upper end of the first connecting seat (19) and a lower motion module located at the lower end of the first connecting seat (19); The power assembly (D) is integrated on one side of the lower motion module, and the output end of the power assembly (D) is connected to the output end of the differential force component (A) to drive the differential force component (A) to move; The motion module includes: a base assembly (B) fixedly connected to the first connecting seat (19); a plurality of synchronous transmission assemblies (C) axially symmetrically distributed on the base assembly (B) and rotatably connected to the base assembly (B); A plurality of second bevel gears (9) meshing with the corresponding synchronous transmission components (C) are axially symmetrically distributed on the base component (B), and one end of the second bevel gear (9) is fixedly connected to the first straight gear (12); The center of the base assembly (B) is rotatably connected to a second spur gear (13) meshing with the plurality of first spur gears (12); The middle portion of the second bevel gear (9) is rotatably connected to the base assembly (B); The base assembly (B) comprises: A mounting base ring (10), wherein the second spur gear (13) is rotatably connected to the mounting base ring (10); a bearing cover (11) fixedly connected to the lower end surface of the mounting base ring (10); and A split mounting seat (8) is axially symmetrically arranged on the upper end surface of the mounting base ring (10), and the axial holes of the split mounting seat (8) are coaxially arranged; The synchronous transmission assembly (C) comprises: A second small shaft (7), the second small shaft (7) is rotatably connected to the shaft hole of the split mounting seat (8), and a synchronous pulley is processed in the middle of the second small shaft (7); A support arm (4) is symmetrically arranged and connected to both ends of the center of the second small shaft (7), and one end of the support arm (4) away from the second small shaft (7) is rotatably connected to the first small shaft (3); The middle part of the first small shaft (3) is rotatably connected to a synchronous pulley (2), and driving wheels (5) are sleeved and fixed on both sides of the synchronous pulley (2) at this end; The left side of the second small shaft (7) is fixedly connected with a first bevel gear (6); A synchronous belt (1) is connected in transmission between the synchronous pulley (2) and the synchronous pulley processed in the middle of the second small shaft (7); The differential device is configured as a differential drive device or a differential preload device; When the differential device is a differential drive device, the support arm (4) is rotationally connected to the second small shaft (7); When the differential device is a differential preload device, the support arm (4) is fixedly connected to the second small shaft (7).

2. A differential device for sleeve deployment according to claim 1, characterized in that: The differential force component (A) comprises: A differential shaft (18), wherein a plurality of small transverse shafts protrude outward from the differential shaft (18), the upper end of the differential shaft (18) is rotatably connected to the third bevel gear (15), and the lower portion of the differential shaft (18) is rotatably connected to the fifth bevel gear (23); a fourth bevel gear (16) rotatably connected to the corresponding small transverse shaft; The third bevel gear (15) is meshed with a plurality of fourth bevel gears (16); The fifth bevel gear (23) is meshed with the plurality of fourth bevel gears (16); The third bevel gear (15) is fixedly connected to the second spur gear (13) of the motion module located above the first connecting seat (19), and the fifth bevel gear (23) is fixedly connected to the second spur gear (13) of the motion module located below the first connecting seat (19).

3. A differential device for sleeve deployment according to claim 2, characterized in that: The power assembly (D) comprises: a second connecting seat (20) fixedly connected to the motion module located below the first connecting seat (19), the second connecting seat (20) having claws evenly distributed along the periphery of the motion module and extending toward one end of the first connecting seat (19); a motor assembly (22) integrated at the center of the lower end of the second connecting seat (20), wherein a coupling (21) is installed at the output end of the motor assembly (22); The motor assembly (22) is connected to the differential shaft (18) via the coupling (21).

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