Electric transmission rotary joint single-ring assembly

Abstract

The invention relates to an electric transmission rotary joint single-ring assembly, which relates to the field of spaceflight electromechanics, and comprises a retainer and rolling rings, the annular retainer is rotatably connected outside an inner ring, a plurality of flexible rolling rings are rotatably connected to the two axial sides of the retainer at intervals, and the outer cambered surfaces of the rolling rings are respectively contacted with the inner ring and an outer ring. And the insulating layer semi-coats the retainer, the rolling ring, the inner ring and the outer ring. The rolling bearing has the advantages of good structural property and high electric transmission capability.

Description

Technical Field

[0001] This invention relates to the field of aerospace electromechanical technology, and in particular to a single-ring component for an electrical transmission rotary joint. Background Technology

[0002] Existing high-power electrical transmission rotary joints are mainly divided into conductive slip rings and conductive roller rings. Roller ring designs have low friction and wear, making them suitable for long-term operation. A flexible ring is used between the rotating and stationary parts to achieve current and power transmission, and the conductive ring leads are led out via soldered wires.

[0003] During the rotation of the rolling ring, multiple flexible ring rollers perform planetary rolling around the central axis of the assembly. Due to errors and slippage in the actual process, the flexible rings will eventually collide and interfere with each other during continuous operation, causing severe wear. It also suffers from poor structural integrity and weak electrical transmission capability.

[0004] Therefore, to address the above shortcomings, there is a need to provide an electrical transmission rotary joint single-ring assembly. Summary of the Invention

[0005] (a) Technical problems to be solved The technical problem to be solved by the present invention is to address the issues of cage support, cage rigidity, and manufacturability.

[0006] (II) Technical Solution To address the aforementioned technical problems, this invention provides an electrical transmission rotary joint single-ring assembly, comprising a retainer and rolling rings. The annular retainer is rotatably connected to the outside of the inner ring, and several flexible rolling rings are rotatably connected at intervals to both axial sides of the retainer. The outer arc surfaces of the rolling rings contact the inner ring and the outer ring respectively, and an insulating layer partially covers the retainer, rolling rings, inner ring, and outer ring.

[0007] As a further explanation of the present invention, preferably, both the outer arc surface of the inner ring and the inner arc surface of the outer ring are provided with raceways with an arc-shaped cross section, and the width of the raceway is the same as the width of the rolling ring so that the outer arc surface of the rolling ring is embedded in the raceway.

[0008] As a further explanation of the present invention, preferably, the retainer is made of polytetrafluoroethylene material so that there is lubrication between the retainer and the rolling ring and the temperature range is -200°C to 260°C.

[0009] As a further explanation of the present invention, preferably, the insulating layer is made of a polyimide material mixed with 5% to 8% by mass of nano-silica particles, so that the insulating layer is both insulating and resistant to space radiation.

[0010] As a further explanation of the present invention, preferably, the insulating layer in the single ring is closed on one side and open on the other side along the axial direction. The closed side is provided with several layers of S-shaped turning labyrinth structure at the rolling ring. The turning labyrinth structure contains a dynamic-static gap, which ensures the gap when the inner ring rotates and the outer ring is stationary, and prevents the migration of wear debris and excess material.

[0011] As a further explanation of the present invention, preferably, the outer surface of the rolling ring is plated with gold, and the gold plating thickness is 2μm to ensure good electrical transmission capability.

[0012] As a further explanation of the present invention, preferably, the outer ring and the conductive ring lead are connected by a terminal block, one end of the terminal block is sleeved on the outside of the conductive ring lead, and the other end of the terminal block is fixedly connected to a sheet-like crimping part, which is crimped and fixedly connected to the outer ring by bolts.

[0013] (III) Beneficial Effects The above-described technical solution of the present invention has the following advantages: This invention achieves lubrication between the flexible rolling ring and the retainer structure by using a retainer made of polytetrafluoroethylene (PTFE) in conjunction with a rolling ring of a specific composition. Compared to bearings, this retainer structure is more compact and easier to assemble. Furthermore, the double-row raceway design, in conjunction with the retainer, allows for the arrangement of more rolling rings within a compact structure, thereby significantly increasing current transmission capacity. Attached Figure Description

[0014] Figure 1 This is a partial cross-sectional view of the present invention; Figure 2 This is a diagram of the terminal connection structure of the present invention.

[0015] In the diagram: 1. Retainer; 2. Roller ring; 3. Inner ring; 31. Raceway; 32. Outer ring; 4. Insulating layer; 41. Turning labyrinth structure; 5. Terminal block; 51. Crimping part. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] An electrical transmission rotary joint single-ring assembly, such as Figure 1As shown, it includes a retainer 1 and a rolling ring 2. The annular retainer 1 is rotatably connected to the outside of the inner ring 3. Several flexible rolling rings 2 are rotatably connected to the axial sides of the retainer 1 at intervals. The outer arc surface of the rolling ring 2 contacts the inner ring 3 and the outer ring 32 respectively. The insulating layer 4 partially covers the retainer 1, the rolling ring 2, the inner ring 3 and the outer ring 32.

[0018] like Figure 1 As shown, the retainer 1 is made of polytetrafluoroethylene (PTFE) to provide lubrication between the retainer and the rolling ring, and has a temperature resistance range of -200℃ to 260℃, making it suitable for the extreme temperature difference environment of deep space exploration. The rolling ring 2 is a small ring structure made of beryllium bronze, which has good electrical conductivity. The outer diameter of the rolling ring 2 is slightly larger than the width of the retainer 1. Both the outer arc surface of the inner ring 3 and the inner arc surface of the outer ring 31 have arc-shaped raceways 31, and the width of the raceways 31 is the same as the width of the rolling ring 2 so that the outer arc surface of the rolling ring 2 is embedded in the raceways 31. The outer surface of the rolling ring 2 is gold-plated with a gold plating thickness of 2μm. This not only ensures good electrical transmission capability but also enhances the damping between the rolling ring 2 and the raceways 31, reducing the vibration-induced runout of the rolling ring 2.

[0019] Furthermore, such as Figure 2 As shown, the outer ring 32 is connected to the conductive ring lead via a terminal 5. One end of the terminal 5 is sleeved around the conductive ring lead, and the other end of the terminal 5 is fixedly connected to a sheet-like crimping part 51. The crimping part 51 is fixed to the outer ring 32 by bolt crimping. The design of the terminal 5 using bolt crimping provides higher mechanical strength and heat resistance. For the design needs of high-voltage, ultra-high-power conductive rotary joints transmitting high power, this customized crimping method, compared to welding, forms a tight interlock between metals through mechanical force, avoiding the embrittlement of the wire material and damage to the insulation layer caused by excessively high temperatures during welding. It also eliminates the risk of incomplete or missed welds and provides stronger long-term vibration and aging resistance. It has lower contact resistance, minimizing the risk of solder joint overheating and melting during high-current transmission. Compared to traditional welding, which can only withstand 20A of high-current heating, the single-ring assembly of this invention can withstand 40A of high-current heating.

[0020] like Figure 1As shown, the insulating layer 4 in the single ring is closed on one side and open on the other along the axial direction. This design avoids an increase in volume due to excessive axial insulation layer thickness when multiple single rings are combined, while ensuring good insulation performance. The insulating layer 4 is made of polyimide material mixed with 5%–8% nano-silica particles by mass, making it both insulating and resistant to space radiation. Several S-shaped turning labyrinth structures 41 are formed on the closed side at the rolling ring 2, with dynamic and static gaps within the turning labyrinth structures 41. The extended wear debris migration path of the turning labyrinth structure 41, combined with the high insulation strength of the polyimide, increases the insulation withstand voltage from the existing 500V to 1500V. Simultaneously, it prevents the migration of wear debris and excess material during the gap when the inner ring 3 rotates and the outer ring 32 is stationary, thus meeting long-term stability requirements in space environments.

[0021] In summary, this invention, through improvements to the single-ring component, not only enhances the structural performance of the retainer 1 but also enables the single ring to withstand higher voltages and transmit higher power, expanding its application scenarios from near-Earth orbit to deep space exploration. The radiation dose resistance is increased from 100 krad to 300 krad, meeting the long-term operational requirements of deep space exploration equipment. Furthermore, the low-volatile sealing design ensures that the insulation performance decays at a rate of ≤5% over a 15-year operating cycle, guaranteeing long-term reliability.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrically transmitting rotational joint single ring assembly, characterized by: It includes holder (1) and rolling ring (2), annular holder (1) is rotationally connected outside inner ring (3), several flexible rolling rings (2) are rotationally connected on both sides of holder (1) in axial direction, outer arc surface of rolling ring (2) is in contact with inner ring (3) and outer ring (32) respectively, and insulation layer (4) semi-encapsulates holder (1), rolling ring (2), inner ring (3) and outer ring (32).

2. An electrically transmitting rotational joint single ring assembly according to claim 1, characterized in that: Inner arc surface of outer ring (32) and outer arc surface of inner ring (3) are both provided with raceway (31) with arc-shaped cross section, the width of raceway (31) is same with the width of rolling ring (2) so that the outer arc surface of rolling ring (2) is embedded in raceway (31).

3. An electrically transmissive rotational joint single ring assembly according to claim 1, characterized in that: Holder (1) is made of polytetrafluoroethylene material, so that holder (1) and rolling ring (2) have lubrication and temperature resistance range of-200~260℃.

4. An electrically transmissive rotational joint single ring assembly according to claim 1, characterized in that: Insulation layer (4) is made of polyimide material mixed with 5%-8% nanometer silicon dioxide particles.

5. An electrically transmitting rotational joint single ring assembly according to claim 4, characterized in that: The side of insulation layer (4) in single ring in axial direction is closed, the other side is open, the closed side is provided with several layers of S-shaped turning labyrinth structure (41) at rolling ring (2), the turning labyrinth structure (41) is provided with tortuous gap, which prevents migration of abrasion and excess material when inner ring (3) rotates and outer ring (32) is stationary.

6. An electrically transmissive rotational joint single ring assembly according to claim 1, characterized in that: The outer surface of rolling ring (2) is plated with gold, and the thickness of gold plating is 2μm to ensure good electrical transmission capacity.

7. An electrically transmissive rotational joint single ring assembly according to claim 1, characterized in that: Outer ring (32) and conductive ring lead are connected through terminal (5), one end of terminal (5) is sleeved on the outer surface of conductive ring lead, and the other end of terminal (5) is fixedly connected with sheet-shaped crimping part (51), and crimping part (51) is fixedly connected with outer ring (32) through bolt crimping.

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