Stacked precise conductive slip ring brush assembly

Abstract

The invention discloses a stacked precision conductive slip ring brush assembly, which comprises a brush seat, array leaf springs, steel balls, gap sheets, brush wire assemblies and a potting body, the brush seat comprises array holes and steel ball grooves; the array holes are symmetrically arranged in two rows along the length direction of the brush seat, are through holes and are used for steel balls to pass through; the steel ball grooves are located in the tail ends of the corresponding array holes and used for storing steel balls, and part of the steel balls are exposed out of the tail ends. The array leaf springs are two leaf springs with L-shaped sections and comprise a plurality of leaf spring modules; the leaf spring module is formed by cutting the same array leaf spring and corresponds to the steel ball groove; the steel balls are elastically pressed in the corresponding steel ball grooves by the leaf spring module; the brush wire assemblies are installed on the brush base through steel balls, and the relative position between every two adjacent brush wire assemblies is adjusted through a gap piece. The potting body is poured into the brush seat after the brush wire assembly is installed. The position precision of the adjacent brush wires is improved, the brush wire forming period, the whole assembly and adjustment failure risk and the repair cost are reduced, and the number of paths for flexibly configuring and transmitting electric signals is controllable.

Description

Technical Field

[0001] This invention relates to the field of electrical transmission technology, and in particular to a stacked precision conductive slip ring brush assembly. Background Technology

[0002] Precision conductive slip rings are used to transfer electrical energy between relatively rotating components in mechanical devices, such as test turntables in inertial equipment and solar cell wing drive mechanisms in aircraft. A precision conductive slip ring generally consists of a ring body, a brush ring, and supporting structural components. Taking an aircraft solar cell wing drive mechanism as an example, the ring body is connected to the solar cell wing circuit via wires, and the brush ring is connected to the battery circuit inside the aircraft cabin via wires. The contact between the brush ring and the ring plate on the ring body achieves electrical connection between the aircraft battery and the solar cell wing, ensuring stable power and signal transmission during their relative rotation. During the assembly and debugging of the slip ring, the alignment of the brush filaments with the ring groove and the control of the brush filament pressure (controlled by the angle) are crucial processes. Traditionally, the positioning holes for the brush filaments are first prepared according to the measured position of the ring groove on the ring body, then the brush filaments are inserted into the positioning holes and bent to the required angle. After the angle is formed, heat treatment is used to remove the bending stress. In this solution, the forming of the bristle positioning holes is quite difficult, and the processing errors after forming cannot be eliminated through assembly. Secondly, due to the temperature resistance of the bristle positioning plate, the bristles can only undergo low-temperature stress relief treatment after bending, which cannot completely release the cold working stress and restore the material properties of the bristles after plastic deformation. The only way to reduce the impact of stress on the bristle opening angle is through multiple bending and multiple heat treatments, resulting in a long production process and high costs. In addition, during the assembly and adjustment process, if any bristle in the same group needs to be readjusted, the entire process needs to be restarted, resulting in a high risk of assembly and adjustment failure.

[0003] Therefore, there is an urgent need for a technology to solve the potential problems in the assembly and adjustment of precision conductive slip ring brush assemblies, such as the inability to eliminate systematic errors, long process cycles, and high failure risks. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a stacked precision conductive slip ring brush assembly.

[0005] The specific technical solution of this invention is as follows:

[0006] A stacked precision conductive slip ring brush assembly includes a brush holder, an array of leaf springs, steel balls, a gap plate, a brush filament assembly, and a potting body;

[0007] The brush holder includes an array of holes and a steel ball groove; the array of holes are arranged symmetrically in two rows along the length of the brush holder, and are all through holes for the steel ball to pass through; the steel ball groove is located at the end of each corresponding array hole, for storing the steel ball, and a portion of the steel ball can be exposed at the end.

[0008] The array of leaf springs consists of two "L"-shaped cross-section leaf springs, which are symmetrically fixed to the brush holder along the length of the brush holder by screws, and includes several leaf spring modules; each leaf spring module is formed by cutting the same array of leaf springs and corresponds to the steel ball groove.

[0009] The steel ball is elastically pressed into the corresponding steel ball groove by the leaf spring module;

[0010] The bristle assembly corresponds to the steel ball groove, and the relative position between each two bristle assemblies is adjusted by a gap plate to achieve precise control of the spacing between adjacent bristle assemblies; the bristle assembly is mounted on the brush holder by the steel ball, which can realize quick disassembly and flexible assembly of the bristle assembly;

[0011] The potting compound is injected into the brush holder after the brush assembly is installed. It is used to seal and fix the components on the brush holder, and at the same time to improve the insulation properties, thermal conductivity and mechanical resistance of the brush assembly.

[0012] The inner opening of the steel ball groove is a hemispherical opening, which can prevent the steel ball from falling out of the inner end of the steel ball groove, while allowing some steel ball to leak out. When the steel ball enters the inner end of the steel ball groove through the array hole, the hemispherical inner opening can block the steel ball from falling out, while the leaked part of the steel ball is used to fix the brush bristle assembly.

[0013] The brush holder is also provided with multiple threaded holes, square grooves, and positioning surfaces; the spring array is embedded in the groove above the brush holder and fixed to the brush holder through the threaded holes.

[0014] The brush assembly includes an insulating base, an insulating plate, brush bristles, crimp terminals, and wires;

[0015] The insulating base is provided with an installation groove, a female buckle and a female buckle through groove, and a beveled groove;

[0016] The insulating buckle plate is provided with male buckles and male buckle through slots;

[0017] The mounting groove is for the brush bristles to pass through and is sealed by an insulating buckle plate; the seal is formed by male and female buckles locking each other; the female buckle through groove and the male buckle through groove are combined to form a through groove; the through groove is used for the brush bristles and wires to pass through, and the brush bristles and wires are sealed and fixed by filling potting body;

[0018] The beveled groove corresponds to the steel ball groove and can accommodate a portion of the steel ball that leaks out from the groove opening, thus fixing the bristle assembly to the positioning surface. Before the bristle assembly is assembled with the brush holder, the steel ball is pressed into the steel ball groove under the pressure of the leaf spring module, with a portion of the steel ball protruding from the groove. During the assembly of the bristle assembly, the steel ball is squeezed back into the steel ball groove. As the bristle assembly comes into contact with the positioning surface, the steel ball is pressed back into the steel ball groove by the leaf spring module, while the protruding portion fits into the beveled groove, thus completing the fixation of the bristle assembly.

[0019] The bristles are pre-bent to the required angle and then subjected to medium-temperature heat treatment to maintain their shape.

[0020] The through groove is provided with a crimp terminal; the crimp terminal is a parallel double-hole structure with a cross-section in the shape of an "8", one hole is used to pass through the brush bristles and the other hole is used to pass through the wire, forming a mechanical, electrical and thermal connection between the brush bristles and the wire.

[0021] The insulating base and insulating buckle are made of insulating materials and have thermal conductivity.

[0022] The potting compound is a potting adhesive, and further, it is an insulating and thermally conductive adhesive.

[0023] The brush holder is made of aluminum alloy; the array leaf spring is made of beryllium bronze; the steel ball is made of 9Cr18; the gap plate is made of stainless steel strip; the potting body is made of silicon micropowder-doped epoxy resin; the insulating base is made of aluminum nitride ceramic; the insulating buckle is made of polyimide; the brush bristles are made of gold-nickel alloy; the crimp terminals are made of copper; and the wires are standard AWG 22#.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0025] 1. The stacking scheme adopted in this invention can eliminate machining errors in the brush bristle positioning holes through assembly, thereby achieving more precise positioning accuracy of adjacent brush bristles;

[0026] 2. The modular solution of the bristle assembly adopted in this invention can achieve precise control of the brush opening angle through one-time bending and heat treatment, which greatly reduces the bristle forming cycle and has better cost control capabilities.

[0027] 3. The brush assembly module of this invention can be easily replaced before final potting, which greatly reduces the risk of assembly failure and rework costs.

[0028] 4. The present invention can control the number of paths for transmitting electrical signals by controlling the length of the brush holder and the array leaf springs and the number of brush filament assemblies. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a stacked modular brush assembly of a stacked precision conductive slip ring brush assembly according to the present invention.

[0031] Figure 2This is a main sectional view of a modular brush assembly of a stacked precision conductive slip ring brush assembly according to the present invention.

[0032] Figure 3 This is an exploded view of the brush filament assembly of a stacked precision conductive slip ring brush assembly according to the present invention;

[0033] Figure 4 This is a schematic diagram of the brush holder of a stacked precision conductive slip ring brush assembly according to the present invention.

[0034] Figure 5 This is a schematic diagram of the leaf spring of a stacked precision conductive slip ring brush assembly according to the present invention;

[0035] Figure 6 This is a schematic diagram of the insulating base of a stacked precision conductive slip ring brush assembly according to the present invention;

[0036] Figure 7 This is a schematic diagram of the insulating buckle plate of a stacked precision conductive slip ring brush assembly according to the present invention;

[0037] Figure 8 This is a schematic diagram of the crimp terminal of a stacked precision conductive slip ring brush assembly according to the present invention.

[0038] Explanation of markings in the diagram:

[0039] 1 is the brush holder; 2 is the array leaf spring; 3 is the steel ball; 4 is the gap plate; 5 is the brush filament assembly; 6 is the potting body; 11 is the array hole; 12 is the threaded hole; 13 is the square groove; 14 is the positioning surface; 15 is the steel ball groove; 21 is the leaf spring module; 51 is the insulating base; 52 is the insulating buckle plate; 53 is the brush filament; 54 is the crimp terminal; 55 is the wire; 511 is the mounting groove; 512 is the female buckle; 513 is the female buckle through groove; 514 is the beveled groove; 521 is the male buckle; 522 is the male buckle through groove. Detailed Implementation

[0040] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0041] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0042] The following is in conjunction with the appendix Figures 1 to 8 The present invention will be further described in detail below:

[0043] like Figure 1 , 2 As shown, a stacked precision conductive slip ring brush assembly includes a brush holder 1, two arrayed leaf springs 2, 40 steel balls 3, several gap plates 4, 20 sets of brush filament assemblies 5, and a potting body 6.

[0044] The brush holder 1 includes an array of holes 11 and a steel ball groove 15. The array of holes 11 are arranged in two rows symmetrically along the length of the brush holder 1, and are all through holes for the steel ball 3 to pass through. The steel ball groove 15 is located at the end of each corresponding array hole 11, for storing the steel ball 3, and can allow some of the steel ball 3 to protrude from the end.

[0045] like Figure 5 As shown, the array leaf spring 2 consists of two "L"-shaped cross-section leaf springs, which are symmetrically fixed to the brush holder 1 along the length direction of the brush holder 1 by screws, and includes several leaf spring modules 21; the leaf spring module 21 is formed by cutting the same array leaf spring 2 and corresponds to the steel ball groove 15.

[0046] The steel ball 3 is elastically pressed into the corresponding steel ball groove 15 by the leaf spring module 21;

[0047] The bristle assembly 5 corresponds to the steel ball groove 15. The relative position of each pair of bristle assemblies 5 is adjusted by the gap plate 4 to achieve precise control of the spacing between adjacent bristle assemblies 5. The bristle assembly 5 is installed on the brush holder 1 by the steel ball 3, which can realize quick disassembly and flexible assembly of the bristle assembly 5.

[0048] The potting compound 6 is injected into the brush holder 1 after the brush assembly 5 is installed. It is used to seal and fix the components on the brush holder 1, and at the same time to improve the insulation characteristics, thermal conductivity and mechanical resistance of the brush assembly 5.

[0049] The inner opening of the steel ball groove 15 is a hemispherical opening, which can prevent the steel ball 3 from coming out of the inner end of the steel ball groove 15, while allowing some of the steel ball 3 to leak out. When the steel ball 3 enters the inner end of the steel ball groove 15 through the array hole 11, the hemispherical inner opening can block the steel ball 3 from coming out, while the leaked part of the steel ball 3 is used to fix the brush bristle assembly 5.

[0050] like Figure 4 As shown, the brush holder 1 is also provided with multiple threaded holes 12, square grooves 13, and positioning surfaces 14; the spring array 2 is embedded in the upper groove 13 of the brush holder 1 and is fixed to the brush holder 1 through the threaded holes 12.

[0051] like Figure 3 As shown, the bristle assembly 5 includes an insulating base 51, an insulating buckle plate 52, bristles 53, a crimp terminal 54, and a wire 55;

[0052] like Figure 6 As shown, the insulating base 51 is provided with an installation groove 511, a female buckle 512, a female buckle through groove 513, and a slanted groove 514;

[0053] like Figure 7 As shown, the insulating buckle plate 52 is provided with a male buckle 521 and a male buckle through groove 522;

[0054] The mounting groove 511 is used for the brush bristles 53 to pass through and is covered by the insulating buckle plate 52; the cover is formed by the male buckle 521 and the female buckle 512 locking each other; the female buckle through groove 513 and the male buckle through groove 522 are combined to form a through groove; the through groove is used for the brush bristles 53 and the wire 55 to pass through, and the brush bristles 53 and the wire 55 are sealed and fixed by the filling potting body 6.

[0055] The oblique groove 514 corresponds to the steel ball groove 15 and can accommodate a portion of the steel ball 2 that leaks out from the groove opening of the steel ball groove 15, thus fixing the bristle assembly 5 onto the positioning surface 14. Before the bristle assembly 5 is assembled with the brush holder 1, the steel ball 3 is pressed into the steel ball groove 15 under the pressure of the leaf spring module 21, with a portion of the steel ball 3 protruding from the steel ball groove 15. During the assembly of the bristle assembly 5, the steel ball 3 is squeezed back into the steel ball groove 15. As the bristle assembly 5 comes into contact with the positioning surface 14, the steel ball 3 is pressed back into the steel ball groove 15 by the leaf spring module 21, and the protruding portion fits into the oblique groove 514, thus completing the fixation of the bristle assembly 5.

[0056] The bristles 53 are pre-bent to the required angle and undergo medium-temperature heat treatment to maintain their shape.

[0057] The through slot is provided with a crimp terminal 54; such as Figure 8 As shown, the crimp terminal 54 has a parallel double-hole structure with a cross-section in the shape of an "8". One hole is used to pass through the brush bristles 53, and the other hole is used to pass through the wire 55, forming a mechanical, electrical, and thermal connection between the brush bristles 53 and the wire 55.

[0058] The insulating base 51 and the insulating buckle 52 are made of insulating materials and have thermal conductivity.

[0059] The potting compound 6 is a potting compound, and further, it is an insulating and thermally conductive adhesive.

[0060] The brush holder 1 is made of aluminum alloy; the array leaf spring 2 is made of beryllium bronze; the steel ball is made of 9Cr18; the gap plate 4 is made of stainless steel strip; the potting body 6 is made of silicon micropowder-doped epoxy resin; wherein, the insulating base 51 is made of aluminum nitride ceramic; the insulating buckle 52 is made of polyimide; the brush bristles 53 are made of gold-nickel alloy; the crimp terminal 54 is made of copper; and the wire 55 is a standard AWG 22#.

[0061] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention based on the above disclosure without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A stacked precision conductive slip ring brush assembly, characterized in that, The assembly comprises a brush holder (1), an array leaf spring (2), a steel ball (3), a gap sheet (4), a brush wire assembly (5), and a potting body (6); The brush holder (1) comprises an array hole (11) and a steel ball groove (15); The array hole (11) is symmetrically arranged in two rows along the length direction of the brush holder (1), and is a through hole for the steel ball (3) to pass through; the steel ball groove (15) is located at the end of each corresponding array hole (11), and is used for storing the steel ball (3) and leaking out part of the steel ball (3) at the end; The array leaf spring (2) is two "L"-shaped cross-section leaf springs, which are symmetrically fixed on the brush holder (1) along the length direction of the brush holder (1) and comprise a plurality of leaf spring modules (21); the leaf spring module (21) is formed by cutting the same array leaf spring (2) and corresponds to the steel ball groove (15); The steel ball (3) is elastically compressed in the corresponding steel ball groove (15) by the leaf spring module (21); The brush wire assembly (5) corresponds to the steel ball groove (15) and is installed on the brush holder (1) through the steel ball (3), and the relative positions between every two adjacent brush wire assemblies (5) are adjusted through the gap sheet (4); The potting body (6) is filled into the brush holder (1) after the brush wire assembly (5) is installed.

2. A precision electrically conductive slip ring brush assembly of the type described in claim 1 wherein, The inner groove of the steel ball groove (15) is a semispherical opening, which prevents the steel ball (3) from being leaked out from the inner end of the steel ball groove (15).

3. A precision electrically conductive slip ring brush assembly of claim 1 wherein, The brush holder (1) is further provided with a plurality of threaded holes (12), square grooves (13), and positioning surfaces (14); the leaf spring array (2) is embedded in the square groove (13) on the brush holder (1) and is fixed with the brush holder (1) through the threaded holes (12).

4. A precision electrically conductive slip ring brush assembly of claim 1 wherein, The brush wire assembly (5) comprises an insulating seat (51), an insulating buckle plate (52), a brush wire (53), a crimping terminal (54), and a lead wire (55); The insulating seat (51) is provided with a mounting groove (511), a female buckle (512), a female buckle through groove (513), and an oblique slot (514); The insulating buckle plate (52) is provided with a male buckle (521) and a male buckle through groove (522); The mounting groove (511) is used for the brush wire (53) to pass through and is capped by the insulating buckle plate (52); the cap is formed by locking the male buckle (521) and the female buckle (512) with each other; the female buckle through groove (513) and the male buckle through groove (522) are combined to form a through groove; the through groove is used for passing the brush wire (53) and the lead wire (55) and sealing and fixing the brush wire (53) and the lead wire (55) by filling the potting body (6); The oblique slot (514) corresponds to the steel ball groove (15) and accommodates part of the steel ball (2) leaked out from the semispherical opening of the inner groove of the steel ball groove (15), and fixes the brush wire assembly (5) on the positioning surface (14).

5. A precision electrically conductive slip ring brush assembly of the type described in claim 4 wherein, The brush wire (53) is pre-bent to the required opening angle and is heat treated at medium temperature to maintain the shape.

6. A precision electrically conductive slip ring brush assembly of the type described in claim 4 wherein, The through groove is provided with the crimping terminal (54); the crimping terminal (54) is in parallel double-hole structure form and has a "8"-shaped cross section, one hole of which is used for passing through the brush wire (53) and the other hole is used for passing through the lead wire (55), thereby forming mechanical, electrical, and thermal communication of the brush wire (53) and the lead wire (55).

7. A precision electrically conductive slip ring brush assembly of claim 1 wherein, The potting body (6) is an insulating and heat-conducting potting adhesive.

8. A precision electrically conductive slip ring brush assembly of the type described in claims 1 or 4, wherein, The insulating seat (51) and the insulating buckle plate (52) are made of insulating material and have heat conduction performance.

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