An electric signal rotating transmission device and a manufacturing method thereof

Abstract

The application relates to an electric signal rotary transmission device and a manufacturing method thereof, characterized by the following features: an inner wiring body comprises an alumina ceramic ring base, a lead pin and an electric connector; the two rows of lead pin mounting holes on the side wall of the alumina ceramic ring base are welded with the inwardly extending lead pins; the corresponding external annular grooves on the lead pins are covered with metal plating layers, the metal plating layers are in electric communication with the corresponding lead pins; the two parts of the electric connector are respectively provided with a row of lead pin plug-in mounting holes, each lead pin plug-in mounting hole is correspondingly provided with an electric signal line extending from one end of the part; the two parts are plug-in mounted and glued in the inner hole of the alumina ceramic ring base, the lead pin plug-in mounting holes are one-to-one plug-in matched with the corresponding rows of lead pins, so that the lead pins are electrically connected with the inner ends of the corresponding electric signal lines; the two insulating rods on the brush holder of an outer wiring body are connected with multiple brush filaments and an outer lead wire; the inner ends of the two rows of brush filaments are respectively overlapped with the corresponding annular grooves of the two rows of lead pins, so that the outer lead wire is electrically connected with the corresponding electric signal lines. The application has high insulation strength and is convenient for maintenance and line changing.

Description

Technical Field

[0001] This invention belongs to the field of electrical signal rotation transmission technology for inertial navigation systems with rotating shafts, and specifically relates to an electrical signal rotation transmission device. Background Technology

[0002] In high-precision inertial navigation systems, a rotating shaft structure is typically used. For systems rotating 180° in both directions, electrical signals can be transmitted using flexible wires. However, for applications requiring continuous rotation, flexible wires are clearly insufficient. Therefore, a method is needed that can overcome the relative rotation of the internal and external structures to achieve electrical signal transmission. Traditional rotating power transmission devices use epoxy resin as the insulation layer. Because the resin has a honeycomb structure, it often exhibits insufficient insulation strength in harsh environments such as humidity and salt spray. Furthermore, once maintenance or rewiring is required, the original power transmission device often becomes unusable due to insufficient inner loop length, which affects electrical performance and results in significant waste. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes an electrical signal rotation transmission device and its manufacturing method. This transmission device has high insulation strength and is easy to maintain and replace.

[0004] One of the above-mentioned objectives of the present invention is achieved by the following technical solution:

[0005] An electrical signal rotation transmission device includes an inner wiring body and an outer wiring body;

[0006] The inner wiring body includes an alumina ceramic ring substrate, a pin, and an electrical connector.

[0007] The alumina ceramic ring substrate is made of ceramic material with an alumina content of 99.5%, and is in the shape of a thin sleeve. Two rows of pin mounting holes are vertically arranged on the side wall of the alumina ceramic ring substrate. The two rows of pin mounting holes are set at 180° relative positions and are staggered sequentially. A pin extending into the ring is welded into each pin hole. Annular grooves are formed on the outer surface of the alumina ceramic ring substrate corresponding to the position of each pin. There is a left and right gap between adjacent annular grooves. A metal plating layer is plated in the annular grooves, and the metal plating layer is electrically connected to the pins on the inner side of the corresponding annular grooves.

[0008] The electrical connector has a two-part structure, each part being a small semi-cylindrical shape. On each part, corresponding to the two rows of pins fixed to the alumina ceramic ring substrate, there is a row of pin insertion holes. On each part, corresponding to the position of each pin insertion hole, there is an axially connected lead wire hole. An electrical signal wire is glued through each lead wire hole, and the electrical signal wires are all led out from one end of the part. The two parts are inserted and glued into the inner hole of the alumina ceramic ring substrate in a facing manner. The pin insertion holes on the two parts respectively form a one-to-one insertion fit with the two rows of pins on the alumina ceramic ring substrate, so that the pins and the inner ends of the corresponding electrical signal wires form an electrical connection.

[0009] The external wiring body includes a brush holder and brush filaments; two insulating rods are fixed on the brush holder, the two insulating rods are arranged in parallel opposite directions, and multiple brush filaments are vertically connected to the two insulating rods at a set interval, and an external lead wire is connected to the outer end of each brush filament.

[0010] Bearings are installed between the outer ends of the alumina ceramic ring base of the inner connector and the inner ends of the outer connector, respectively, so that the outer connector and the outer connector form an inner and outer rotation support fit. The inner ends of the two rows of brush wires on the outer connector respectively form overlapping contact with the annular grooves corresponding to the two rows of pins on the inner connector, so that the outer lead wires form an electrical connection with the corresponding electrical signal lines.

[0011] Furthermore, the length of the inner protrusion of the needle is 1 ± 0.1 mm.

[0012] Moreover, the thickness of the metal coating is >0.1mm.

[0013] Moreover, the metal coating is a gold coating, a palladium-nickel alloy coating, or a gold-containing composite coating.

[0014] The second objective of this invention is achieved through the following technical solution:

[0015] A method for manufacturing an electrical signal rotation transmission device as described above includes the following steps:

[0016] Step 1: Machining a 99.5% alumina ceramic ring blank, and machining two rows of relatively staggered pin mounting holes radially on the ceramic ring blank to form an alumina ceramic ring substrate;

[0017] Step 2: Machining the metal pin, welding the pin to the pin mounting hole on the alumina ceramic ring substrate using vacuum brazing, and ensuring that the inner extension of the ring pin is 1±0.1mm;

[0018] Step 3: Machine an annular groove on the outside of the alumina ceramic ring substrate and the pin assembly corresponding to each pin;

[0019] Step 4: After forming the annular groove, perform overall electroplating to form a metal coating with a thickness >0.1mm;

[0020] Step 5: After plating, retain the plating layer inside the annular groove and remove the excess plating layer from the rest;

[0021] Step 6: Fabricate two separate parts of the electrical connector. Each part is a small semi-circular cylindrical structure. A row of pin insertion holes is vertically machined on each part at the position corresponding to the highest point. A lead wire hole is located at the position corresponding to the pin insertion hole on each part. One end of the lead wire hole is connected to the corresponding pin insertion hole, and the other end extends to one end of the part. Insert an electrical signal wire into each lead wire hole and encapsulate it with glue.

[0022] Step 7: Insert the two parts into the inner cavity of the alumina ceramic ring matrix, insert the pin holes and pins one by one and fix them with silicone to complete the connection of the inner wiring of the electrical signal rotation transmission device.

[0023] Step 8: Make the outer wiring body. Connect the outer wiring body and the inner wiring body to form a relative rotatable fit through the bearings at both ends. Make the brush filaments on the outer wiring body and the annular grooves on the inner wiring body overlap and slide relative to each other to complete the making of the electrical signal rotation transmission device.

[0024] Furthermore, both step 3, processing the annular groove, and step 5, removing excess coating, are performed using ultrasonic processing.

[0025] The advantages and positive effects of this invention are as follows:

[0026] 1. This invention uses an alumina ceramic ring substrate as the base component for signal splitters. Compared with existing methods that use epoxy resin adhesive for insulation, this avoids problems such as adhesive aging and peeling, and achieves higher insulation strength and insulation retention.

[0027] 2. This invention uses an alumina ceramic ring with a purity of over 99.5% to construct the insulating substrate; the pins are welded to the alumina ceramic ring substrate by vacuum brazing, and a metal plating layer is set on the outside of the welded pins to achieve the transmission of electrical signals; the internal connection of electrical signals is completed by the insertion and mating of the pin socket on the electrical connector. If there is any rewiring or maintenance in the future, only the electrical connector needs to be replaced, while the difficult-to-process ceramic ring, vacuum brazing, and plating layer can be retained, which greatly saves costs and improves the transmission quality of electrical signals. Attached Figure Description

[0028] Figure 1 This is a simplified overall structural diagram of the electrical signal rotation transmission device of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the alumina ceramic ring matrix in the inner wiring body of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the lead pin of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the present invention, in which the lead is welded to the alumina ceramic ring substrate;

[0032] Figure 5 This is a schematic diagram of the structure of the present invention after an annular groove is machined on the outer surface of the alumina ceramic ring matrix;

[0033] Figure 6 This is a schematic diagram of the split structure of the electrical connector of the present invention, where 6a is a front view, 6b is a top view, and 6c is a right view;

[0034] Figure 7 This is a schematic diagram of the structure of the present invention, in which an electrical connector is inserted into an alumina ceramic ring matrix and an internal lead is connected. Detailed Implementation

[0035] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0036] Please refer to an electrical signal rotation transmission device. Figures 1-7 The invention is based on the fact that it includes an inner wire body 3 and an outer wire body 1 that rotate and cooperate with each other.

[0037] The inner wiring body includes an alumina ceramic ring substrate 3.1, a pin 3.2, and an electrical connector.

[0038] The alumina ceramic ring substrate is made of ceramic material with an alumina content of 99.5%. It is a thin sleeve shape, with two rows of pin mounting holes 3.1.1 vertically arranged on the sidewall of the alumina ceramic ring substrate. The two rows of pin mounting holes are positioned at 180° relative to each other and are staggered sequentially. A pin extending into the ring is welded into each pin hole, with an extension length of 1 ± 0.1 mm. Annular grooves 3.3 are formed on the outer surface of the alumina ceramic ring substrate corresponding to the position of each pin. Adjacent annular grooves are spaced left and right. A metal plating layer is plated inside the annular grooves, electrically connected to the pins inside the corresponding annular grooves. The thickness of the metal plating layer is >0.1 mm. The electrical connector has a two-part structure. Each part 3.4 is a small semi-cylindrical shape. On each part, corresponding to the two rows of pins fixed to the alumina ceramic ring substrate, there is a row of pin insertion holes 3.4.1. On each part, corresponding to the position of each pin insertion hole, there is a lead wire hole connected axially. An electrical signal wire 3.5 is glued through each lead wire hole, and the electrical signal wires are all led out from one end of the part. The two parts are inserted and glued into the inner hole of the alumina ceramic ring substrate in an opposing manner. The pin insertion holes on the two parts respectively form a one-to-one insertion fit with the two rows of pins on the alumina ceramic ring substrate, so that the pins and the inner ends of the corresponding electrical signal wires are electrically connected.

[0039] The external wiring body includes a brush holder 1.2 and brush filaments 1.3. Two insulating rods are fixed on the brush holder, and the two insulating rods are arranged in parallel opposite directions. Multiple brush filaments are vertically connected to the two insulating rods at a set interval, and an external lead wire 1.1 is connected to the outer end of each brush filament.

[0040] Bearings are installed between the outer ends of the alumina ceramic ring base of the inner connector and the inner ends of the outer connector, respectively, so that the outer connector and the outer connector form an inner and outer rotation support fit. The inner ends of the two rows of brush wires on the outer connector respectively form overlapping contact with the annular grooves corresponding to the two rows of pins on the inner connector, so that the outer lead wires form an electrical connection with the corresponding electrical signal lines.

[0041] The method for manufacturing the electrical signal rotation transmission device of the present invention is as follows:

[0042] First, a 99.5% alumina ceramic ring blank is machined, and several pin mounting holes with a diameter of 1.2 mm are machined radially on the ceramic ring blank (the number of pin mounting holes depends on the requirements of the power transmission loop of the power transmission device), forming the alumina ceramic ring substrate. Preferably, the pin mounting holes can be machined in two rows on the ceramic ring blank (this ensures the number of power transmission loops and facilitates insulation between loops).

[0043] Then, the metal pin is machined with a pin diameter and a gap of 0.01-0.03 mm between the pin and the mounting hole. The pin is then welded to the pin mounting hole on the ceramic ring substrate using vacuum brazing, ensuring that the inner extension of the ring pin is 1 ± 0.1 mm.

[0044] The alumina ceramic ring substrate and the above-mentioned assembly of the pins are ultrasonically machined on the outside corresponding to each pin to create an annular groove. During the machining process, the metal pins and the ceramic ring are machined simultaneously.

[0045] After forming the annular groove, the whole thing is electroplated to form a metal coating with a film thickness of >0.1mm. The coating should generally be a gold coating, a palladium-nickel alloy coating, or a gold-containing composite coating.

[0046] After plating, the plating layer inside the annular groove should be retained, and the excess plating layer in the remaining part should be removed. Ultrasonic processing should generally be used.

[0047] A special miniature electrical connector is manufactured, consisting of two separate parts, each a small semi-circular cylindrical structure. A row of pin insertion holes, each 1mm in diameter, is vertically machined at the highest point on each part. Corresponding to the pin insertion holes on each part are lead holes, one end of which connects to the corresponding pin insertion hole, and the other end extends to one end of the part. A signal wire, made of enameled wire with a diameter of 0.1-0.3mm, is inserted into each lead hole and encapsulated in a small semi-circular cylindrical shape with an insulating outer sheath.

[0048] Insert the two parts of the above-mentioned electrical connector into the cavity of the alumina ceramic ring base, and assemble the pin sockets and pins one by one and fix them with silicone to complete the connection of the internal wiring of the electrical signal rotation transmission device.

[0049] The outer wire body is manufactured, and the outer wire body and the inner wire body are connected to each other through the bearings 2 at both ends to form a relative rotatable fit. The brush filaments on the outer wire body are connected to the annular grooves on the inner wire body to form a relative sliding contact, thus completing the manufacture of the electrical signal rotation transmission device.

[0050] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An electrical signal rotation transmission device, comprising an inner wiring body and an outer wiring body, characterized in that: The inner wiring body includes an alumina ceramic ring substrate, a pin, and an electrical connector. The alumina ceramic ring substrate is made of ceramic material with an alumina content of 99.5%, and is in the shape of a thin sleeve. Two rows of pin mounting holes are vertically arranged on the side wall of the alumina ceramic ring substrate. The two rows of pin mounting holes are set at 180° relative positions and are staggered sequentially. A pin extending into the ring is welded into each pin hole. Annular grooves are formed on the outer surface of the alumina ceramic ring substrate corresponding to the position of each pin. There is a left and right gap between adjacent annular grooves. A metal plating layer is plated in the annular grooves, and the metal plating layer is electrically connected to the pins on the inner side of the corresponding annular grooves. The electrical connector has a two-part structure, each part being a small semi-cylindrical shape. On each part, corresponding to the two rows of pins fixed to the alumina ceramic ring substrate, there is a row of pin insertion holes. On each part, corresponding to the position of each pin insertion hole, there is an axially connected lead wire hole. An electrical signal wire is glued through each lead wire hole, and the electrical signal wires are all led out from one end of the part. The two parts are inserted and glued into the inner hole of the alumina ceramic ring substrate in a facing manner. The pin insertion holes on the two parts respectively form a one-to-one insertion fit with the two rows of pins on the alumina ceramic ring substrate, so that the pins and the inner ends of the corresponding electrical signal wires form an electrical connection. The external wiring body includes a brush holder and brush filaments; two insulating rods are fixed on the brush holder, the two insulating rods are arranged in parallel opposite directions, and multiple brush filaments are vertically connected to the two insulating rods at a set interval, and an external lead wire is connected to the outer end of each brush filament. Bearings are installed between the outer ends of the alumina ceramic ring base of the inner connector and the inner ends of the outer connector, respectively, so that the outer connector and the outer connector form an inner and outer rotation support fit. The inner ends of the two rows of brush wires on the outer connector respectively form overlapping contact with the annular grooves corresponding to the two rows of pins on the inner connector, so that the outer lead wires form an electrical connection with the corresponding electrical signal lines.

2. The electrical signal rotation transmission device according to claim 1, characterized in that: The length of the inner protrusion of the needle is 1 ± 0.1 mm.

3. The electrical signal rotation transmission device according to claim 1, characterized in that: The thickness of the metal coating is >0.1 mm.

4. The electrical signal rotation transmission device according to claim 1, characterized in that: The metal coating is a gold coating, a palladium-nickel alloy coating, or a gold-containing composite coating.

5. A method for manufacturing an electrical signal rotation transmission device as described in any one of claims 1-4, characterized in that: Includes the following steps: Step 1: Machining a 99.5% alumina ceramic ring blank, and machining two rows of relatively staggered pin mounting holes radially on the ceramic ring blank to form an alumina ceramic ring substrate; Step 2: Machining the metal pin, welding the pin to the pin mounting hole on the alumina ceramic ring substrate using vacuum brazing, and ensuring that the inner extension of the ring pin is 1±0.1mm; Step 3: Machine an annular groove on the outside of the alumina ceramic ring substrate and the pin assembly corresponding to each pin; Step 4: After forming the annular groove, perform overall electroplating to form a metal coating with a thickness >0.1mm; Step 5: After plating, retain the plating layer inside the annular groove and remove the excess plating layer from the rest; Step 6: Fabricate two separate parts of the electrical connector. Each part is a small semi-circular cylindrical structure. A row of pin insertion holes is vertically machined on each part at the position corresponding to the highest point. A lead wire hole is located at the position corresponding to the pin insertion hole on each part. One end of the lead wire hole is connected to the corresponding pin insertion hole, and the other end extends to one end of the part. Insert an electrical signal wire into each lead wire hole and encapsulate it with glue. Step 7: Insert the two parts into the inner cavity of the alumina ceramic ring matrix, insert the pin holes and pins one by one and fix them with silicone to complete the connection of the inner wiring of the electrical signal rotation transmission device. Step 8: Make the outer wiring body. Connect the outer wiring body and the inner wiring body to form a relative rotatable fit through the bearings at both ends. Make the brush filaments on the outer wiring body and the annular grooves on the inner wiring body overlap and slide relative to each other to complete the making of the electrical signal rotation transmission device.

6. The method for manufacturing the electrical signal rotation transmission device according to claim 5, characterized in that: Step 3, machining the annular groove, and step 5, removing excess coating, both employ ultrasonic machining.

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