An electrically driven three-stage planetary reduction drive angle detection device

Abstract

The application discloses an electrically-driven three-stage planetary reduction drive angle detection device, which comprises an angle detection gear disc, an angle detection box and a flange box cover. The angle detection box is provided with a gear potentiometer which is engaged with the angle detection gear disc. The gear potentiometer is installed on a potentiometer mounting shaft in the angle detection box. An angle sensor driving shaft is arranged on the gear potentiometer. The angle sensor driving shaft is connected with an angle sensor. The cross section of the angle sensor driving shaft is in a D-shaped structure. A groove is arranged on the angle sensor driving shaft and opens to the plane side of the D-shaped structure. A spring sheet is arranged at the opening position of the groove. According to the technical scheme, when the spring sheet is pressed, the spring sheet will be deformed inwardly, thereby realizing the quick installation of the gear potentiometer. After the installation is completed, the gear potentiometer is prevented from falling off under the elastic potential energy of the spring sheet. In the whole operation process, the angle sensor driving shaft is always tightly matched with the angle sensor due to the force of the spring sheet, thereby ensuring the accuracy of the signal feedback.

Description

Technical Field

[0001] This invention pertains to transmission devices, and more particularly to an electric drive three-stage planetary reduction drive angle detection device suitable for smart homes and for automatically opening and closing smart home products with lids. Background Technology

[0002] With economic development and the improvement of people's living standards, people's requirements for bathroom appliances and even household appliances are getting higher and higher, and intelligent and automated products are becoming increasingly popular in today's market. Therefore, today's smart toilets, smart dishwashers, smart sinks, and washing machines are becoming more and more intelligent and automated, among which the automatic lid-opening function is one of the manifestations of smart toilets, smart dishwashers, smart sinks, and smart washing machines.

[0003] Currently, there are many electrically driven flip-top dampers with drive covers on the market, also known as "electrically driven actuators." Existing electrically driven flip-top dampers mainly consist of a flip-top gearbox. Their automatic flipping is generally driven by a PCB board controlling the movement of a gearbox assembly with a motor, such as driving the flipping of the seat and seat ring of a smart toilet. However, most automatic flip-top gearboxes on the market have high friction in their motors, reduction gearboxes, and rotating shafts, resulting in high transmission ratios, high noise, and easy gear damage. This leads to a relatively short overall lifespan of the gearbox (less than 10,000 opening and closing cycles) and a high product failure rate. Furthermore, existing electrically driven flip-top dampers are relatively large, requiring significant installation space.

[0004] To address this issue, the applicant developed a smart home electrically driven flip cover buffer that is small in size, has high output torque, a compact structure, low friction, low noise, stable operation, long service life, and features quick opening and slow closing functions (see CN108980288A). However, during actual use, a problem of lag in rotation angle feedback was discovered. Disassembly revealed a gap in the angle sensor drive shaft connection to the angle sensor, causing errors in angle sensor signal acquisition. Furthermore, in assembly, the potentiometer gear is prone to detachment, affecting assembly efficiency. This invention addresses this problem by designing an electrically driven three-stage planetary reducer driver angle detection device, thus resolving the signal acquisition lag issue. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides an angle detection device for an electrically driven three-stage planetary reducer drive that features a compact structure, improved assembly efficiency, and solves the problem of lag in angle signal acquisition.

[0006] This invention is implemented as follows: an angle detection device for an electrically driven three-stage planetary reducer includes an angle detection gear plate connected to a power output shaft, an angle detection box on a gear ring housing near the power output shaft end, a flange cover mounted on the angle detection box, the power output shaft extending out of the flange cover, and an angle detection element for detecting the rotation angle of the power output shaft installed inside the angle detection box. The angle detection element is a gear potentiometer, mounted on a potentiometer mounting shaft inside the angle detection box, and the potentiometer gear of the gear potentiometer meshes with the angle detection gear plate. An angle sensor drive shaft is coaxially mounted on the potentiometer gear, and the angle sensor drive shaft is connected to an angle sensor. The cross-section of the angle sensor drive shaft is a D-shaped structure, and the angle sensor drive shaft has a groove along the axial direction that opens to the planar side of the D-shaped structure. A spring is provided at the opening of the groove.

[0007] Preferably, the end of the spring sheet is provided with an inclined guide surface.

[0008] Preferably, the outer circumference of the power output shaft mounting hole of the flange cover is provided with at least one elastic claw, and the power output shaft is provided with a limiting groove.

[0009] Preferably, there are 2-6 elastic claws, which are evenly distributed around the circumference.

[0010] Preferably, an annular sealing groove is provided on the power output shaft inside the limiting slot, and a sealing ring is fitted into the annular sealing groove.

[0011] The advantages and technical effects of this invention are as follows: When the spring is compressed, it will deform inward, thereby realizing the rapid installation of the potential gear. After installation, the potential gear will not fall off under the action of the elastic potential energy of the spring. Moreover, during the entire operation, due to the force of the spring, the angle sensor drive shaft always maintains a tight fit with the angle sensor, ensuring the accuracy of signal feedback. Attached Figure Description

[0012] Figure 1 Schematic diagram of the structure of this invention;

[0013] Figure 2 This is a structural diagram excluding the angle detection box and flange cover;

[0014] Figure 3 This is a schematic diagram of the potentiometer mounting shaft setting position structure;

[0015] Figure 4 This is a schematic diagram of the connection structure between the angle detection element and the potentiometer gear;

[0016] Figure 5 and Figure 6 This is a schematic diagram of the three-dimensional structure of a potentiometer gear.

[0017] In the diagram: 1. Angle detection box; 1-1. Flange cover; 1-101. Elastic chuck; 1-2. Angle detection element; 1-3. Potentiometer mounting shaft; 1-4. Potentiometer gear; 1-5. Angle sensor drive shaft; 1-6. Angle sensor; 1-7. Slot; 1-8. Spring; 2. Angle detection gear; 3. Power output shaft; 4. Third-stage planetary reduction unit. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] Please see Figures 1 to 6 An electric three-stage planetary reducer drive angle detection device includes an angle detection gear 2 connected to a power output shaft, the angle detection gear 2 connected to a third-stage planetary reducer unit 4, an angle detection box 1 provided on the gear ring housing near the power output shaft end, a flange cover 1-1 installed on the angle detection box away from the drive motor, the power output shaft extending out of the flange cover, and an angle detection element 1-2 for detecting the rotation angle of the power output shaft installed inside the angle detection box. The three-stage planetary gears of the three-stage planetary reducer unit mesh with the three-stage sun gear, and achieve three-stage power reduction with the internal teeth of the gear ring housing, thereby driving the angle detection gear 2 to rotate, transmitting power to the power output shaft 3, and outputting power, while simultaneously driving the angle detection gear 2 to rotate within a set angle range.

[0020] The angle detection element is a gear potentiometer, which is mounted on a potentiometer mounting shaft 1-3 inside the angle detection box, and the potentiometer gear 1-4 of the gear potentiometer meshes with the angle detection gear disk 2; an angle sensor drive shaft 1-5 is coaxially mounted on the potentiometer gear, and the angle sensor drive shaft is connected to an angle sensor 1-6. The rotation angle of the power output shaft is detected and fed back in real time by the gear potentiometer to reflect the opening degree of the actuator on which the driver of the present invention is mounted.

[0021] The cross-section of the angle sensor drive shaft is a D-shaped structure. The angle sensor drive shaft has a groove 1-7 that opens to the plane side of the D-shaped structure along the axial direction. A spring piece 1-8 is provided at the opening of the groove. When the spring piece is pressed, it will deform inward, thereby realizing the installation of the potential gear and preventing it from falling off during the assembly process.

[0022] Preferably, the end of the spring is provided with an inclined guide surface, which improves the installation efficiency of the assembled guide angle sensor drive shaft.

[0023] The flange cover has at least one elastic claw 1-101 on the outer circumference of the power output shaft mounting hole, and the power output shaft is provided with a limiting groove.

[0024] Preferably, the outer circumference of the power output shaft mounting hole of the flange cover is provided with at least one elastic claw 1-10, and the power output shaft is provided with a limiting groove 3-1. After assembly, the claw engages with the limiting groove to ensure that the installation position of the power output shaft is relatively fixed, thereby ensuring the meshing of the angle detection gear 2 with the potentiometer gear. There are 2-6 elastic claws, evenly distributed circumferentially. Traditionally, a retaining spring is used for limiting the power output shaft during installation. This technical solution replaces the existing retaining spring, eliminating a retaining spring assembly step and improving production efficiency and product stability.

[0025] Preferably, an annular sealing groove is provided on the power output shaft inside the limiting slot, and a sealing ring is fitted into the annular sealing groove to ensure the seal between the power output shaft and the flange cover during the rotation of the power output shaft.

[0026] Using the above technical solution, when the spring is compressed, it will deform inward, thereby realizing the rapid installation of the potential gear. After installation, the elastic potential energy of the spring ensures that the potential gear will not fall off. Moreover, during the entire operation, due to the force of the spring, the angle sensor drive shaft always maintains a tight fit with the angle sensor, ensuring the accuracy of signal feedback.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An angle detection device for an electrically driven three-stage planetary reducer drive, comprising an angle detection gear plate connected to a power output shaft, an angle detection box provided on a gear ring housing near the power output shaft end, a flange cover mounted on the angle detection box, the power output shaft extending out of the flange cover, and an angle detection element for detecting the rotation angle of the power output shaft installed inside the angle detection box; the angle detection element is a gear potentiometer, the gear potentiometer is mounted on a potentiometer mounting shaft inside the angle detection box, and the potentiometer gear of the gear potentiometer meshes with the angle detection gear plate; an angle sensor drive shaft is coaxially mounted on the potentiometer gear, and the angle sensor drive shaft is connected to an angle sensor; characterized in that: The angle sensor drive shaft has a D-shaped cross-section. The angle sensor drive shaft has a groove that opens to the plane side of the D-shaped structure along the axial direction. A spring is provided at the opening of the groove. When the spring is pressed, it will deform inward, thereby realizing the installation of the potential gear and preventing it from falling off during the assembly process. The end of the spring is provided with an inclined guide surface; The flange cover has at least one elastic claw on the outer circumference of the power output shaft mounting hole, and the power output shaft has a limiting groove.

2. The angle detection device for an electrically driven three-stage planetary reducer drive according to claim 1, characterized in that: The elastic claws are provided in 2-6 parts and are evenly distributed around the circumference.

3. The angle detection device for an electrically driven three-stage planetary reducer drive according to claim 1, characterized in that: An annular sealing groove is provided on the power output shaft inside the limiting slot, and a sealing ring is fitted into the annular sealing groove.

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