Angle sensor

Abstract

The utility model discloses an angle sensor which comprises a first rotating body and a second rotating body which can rotate relatively, an eddy current sensing module is arranged between the first rotating body and the second rotating body, and the eddy current sensing module comprises a coil arranged on the first rotating body and a metal sheet arranged on the second rotating body. The first rotating body and the second rotating body are both of a hollow annular structure, a plurality of first convex lugs are distributed on the periphery of the first rotating body in the circumferential direction of the center of the first rotating body, a plurality of mounting holes are formed in the first convex lugs, an annular groove is concentrically formed in the axial inner side of the first rotating body, and the coil is embedded in the annular groove. A second convex lug is arranged on the periphery of the second rotating body, a transmission connecting hole is formed in the second convex lug, a plurality of grooves which are uniformly distributed in the circumferential direction are formed in the axial inner side of the second rotating body, and the metal sheets are embedded in the grooves. The angle sensor provided by the utility model is good in dustproof effect, long in service life, reliable in work, and suitable for assembly connection at a non-central position.

Description

TECHNICAL FIELD

[0001] The utility model relates to an angle sensor. BACKGROUND

[0002] The existing angle sensor on the market generally adopts a potentiometer type angle sensor, which mainly comprises a resistor body and a brush. When the shaft drives the brush to rotate on the resistor body, the contact position of the brush and the resistor body changes. Since the resistance distribution of the resistor body is linear or follows a certain rule, the brush will generate different resistance values at different positions. However, this design has many drawbacks. On the one hand, since the steel brush needs to be in continuous contact and friction with the resistor during use, as the use frequency increases, wear will inevitably occur between the two. This not only causes changes in the physical structure of the steel brush and the resistor, shortening their respective service lives, but also, from the perspective of measurement accuracy, long-term wear will make the contact condition unstable, thereby causing the measurement data to deviate more and more after long-term use of the sensor, and the accuracy decreases dramatically. On the other hand, the steel brush and the resistor are two independent combined components, and there is inevitably a certain gap between them. In actual application scenarios, such as outdoor and factory workshop environments, fine sand in the air can easily enter the interior of the sensor through these gaps and adhere to and cover the surface of the resistor. Sand itself is an insulator, and once a large amount of fine sand accumulates on the resistor, it will seriously interfere with the conductivity of the resistor, causing a significant decrease in its conductivity, ultimately resulting in a significant reduction in the measurement accuracy of the entire angle sensor, which cannot meet the high-precision measurement requirements.

[0003] There are also angle sensors using eddy current technology in the prior art, which generally include a first rotating body and a second rotating body. The first rotating body is provided with a coil, which includes an excitation coil and a receiving coil. The excitation coil generates an alternating magnetic field after being energized. When a metal target approaches, an eddy current is generated on the metal surface. The receiving coil detects the magnetic field changes generated by the eddy current. However, this existing angle sensor is usually assembled and connected between the center position and the rotating body, and cannot be applied to some special use scenarios. SUMMARY

[0004] In order to overcome the defects of the above-mentioned prior art, the utility model provides an angle sensor with good dustproof effect, long service life and reliable work, which can be applied to non-central position assembly connection.

[0005] The angle sensor of the utility model, including the first rotator, the second rotator, the first rotator and the second rotator are equipped with the eddy current response module, the eddy current response module includes the coil set on the first rotator, the metal sheet set on the second rotator, with the relative rotation of the first, the second rotator, the relative position of the metal sheet and the coil changes, the coil will produce the changing induced current, the detection of the relative rotation angle between the first, the second rotator can be realized through the monitoring and identification of the induced current, the first rotator and the second rotator are all hollow annular structure, the central spare position of the first rotator and the second rotator is not easy to produce the interference between the equipment when assembling between the sensor and the equipment, the outer periphery of the first rotator is provided with a plurality of first lugs which are distributed and arranged in the circumferential direction of the center, a plurality of mounting holes are arranged on the first lug, the first rotator and the equipment can be installed and fixed through the screw, the annular groove is concentrically arranged on the corresponding axial inner side of the first rotator and the second rotator, the coil is embedded in the annular groove, the outer periphery of the second rotator is provided with a second lug, a transmission connecting hole is arranged on the second lug, the transmission connecting hole is used for the transmission connection with the movable component on the equipment, the second rotator is driven to rotate relative to the first rotator by the component, a plurality of grooves which are evenly distributed in the circumferential direction are arranged on the corresponding axial inner side of the first rotator and the second rotator, and the metal sheet is embedded in the groove.

[0006] Further, the inner periphery of the second rotator is provided with a plurality of axially extending elastic arms in the circumferential direction, the end of the elastic arm is provided with a plurality of radially outward buckles, the inner periphery of the first rotator is provided with an annular inner edge, the plurality of buckles and the annular inner edge constitute axial and radial limit cooperation, the rotation connection of the first rotator and the second rotator can be realized, the connecting shaft, screw and other components are not needed during assembly, the structure is simple, the disassembly and assembly are also relatively convenient, and the central position space of the rotator is not occupied.

[0007] Further, the outer peripheral wall of the annular groove is provided with an opening, which facilitates the arrangement of the circuit board or the wire.

[0008] Further, the axial inner side of the second rotator is provided with an annular groove connected to the radial inner side of the plurality of grooves, the metal sheet includes a plurality of convex parts embedded in the grooves and an annular connecting part integrally connected with the plurality of convex parts, facilitating the disassembly and assembly of the metal sheet.

[0009] Further, the transmission connecting hole is arranged in the radial direction of the second rotator and is provided with a mounting port at the radial outer end of the second lug, facilitating the transmission connection between the movable component on the equipment and the second rotator, and the transmission connecting hole with this structure can reduce the influence of assembly position and machining process precision error.

[0010] The angle sensor of the utility model has the advantages that the angle sensor adopts the eddy current induction technology, has better dustproof effect, and has simple structure, convenient disassembly and assembly, long service life and stable and reliable work. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the structural diagram of the utility model embodiment;

[0012] Figure 2 It is the assembly schematic view of the first and second rotating bodies of the utility model embodiment;

[0013] Figure 3 It is the assembly schematic view of the metal sheet and the second rotating body of the utility model embodiment;

[0014] Figure 4 It is the structural schematic view of the first rotating body of the utility model embodiment. DETAILED DESCRIPTION

[0015] The structure of the angle sensor of the utility model embodiment is shown in Figures 1-4 The first rotating body 1 and the second rotating body 2 are provided with an eddy current induction module, the eddy current induction module includes a coil (not shown in the figure, including an excitation coil and a receiving coil) arranged on the first rotating body 1 and a metal sheet 4 arranged on the second rotating body 2, with the relative rotation of the first and second rotating bodies, the relative position of the metal sheet 4 and the coil changes, the coil generates a changing induced current, and the detection of the relative rotation angle between the first and second rotating bodies can be realized by monitoring and identifying the induced current, the first rotating body 1 and the second rotating body 2 are both hollow annular structures, the central hollow position of the first rotating body 1 and the second rotating body 2 is not easy to interfere with the equipment when assembling between the sensor and the equipment, the outer periphery of the first rotating body 1 is provided with two first lugs 5 distributed in the center in the circumferential direction, a plurality of mounting holes 6 are arranged on the first lug 5, the mounting hole 6 is used for penetrating a screw, the first rotating body 1 and the equipment can be installed and fixed by the screw, the first rotating body 1 is provided with a ring groove 7 concentrically arranged on the corresponding axial inner side of the second rotating body 2, the coil is embedded in the ring groove 7, the outer periphery of the second rotating body 2 is provided with a second lug 8, the second lug 8 is provided with a transmission connection hole 9, the transmission connection hole 9 is used for cooperating with the movable part on the equipment to be transmission connected, the second rotating body 2 is driven to rotate relative to the first rotating body 1 by the part, the second rotating body 2 is provided with a plurality of grooves 10 arranged in the circumferential direction on the corresponding axial inner side of the first rotating body 1, and the metal sheet 4 is embedded in the groove 10.

[0016] The inner periphery of the second rotating body 2 is provided with a plurality of axially extending elastic arms 11 in the circumferential direction, the end of the elastic arm 11 is provided with a plurality of radially outward buckles 12, the inner periphery of the first rotating body 1 is provided with an annular inner edge 13, the plurality of buckles 12 and the annular inner edge 13 constitute axial and radial limiting cooperation, which can realize the rotating connection of the first rotating body 1 and the second rotating body 2, and does not need to use connecting shaft, screw and other components during assembly, the structure is simple, disassembly is also relatively convenient, and the middle position space of the rotating body is not occupied.

[0017] As shown in Figure 4 The outer peripheral wall of the annular groove 7 is provided with an opening 14, which is convenient for the arrangement of the line board or the wire.

[0018] The axially inner side of the second rotating body 2 is provided with an annular groove 15 connected to the radially inner side of the plurality of grooves 10, the metal sheet 4 comprises a plurality of convex portions 41 embedded in the grooves 10, and an annular connecting portion 42 integrally connected with the plurality of convex portions 41, which is convenient for disassembly of the metal sheet 4.

[0019] The transmission connection hole 9 extends along the radial direction of the second rotating body 2, and is provided with a mounting port 18 at the radially outer end of the second lug 8, which is convenient for the transmission connection between the movable part of the equipment and the second rotating body 2, and the transmission connection hole 9 with this structure can reduce the influence of the assembly position and the machining process precision error.

[0020] The above embodiment is only one of the preferred specific embodiments of the present application, and the usual changes and replacements made by those skilled in the art within the technical scheme of the present application are all included in the protection scope of the present application.

Claims

1. An angle sensor, comprising a first rotating body and a second rotating body that are rotatable relative to each other, wherein an eddy current sensing module is disposed between the first rotating body and the second rotating body, the eddy current sensing module comprising a coil disposed on the first rotating body and a metal sheet disposed on the second rotating body, characterized in that: The first rotating body and the second rotating body are hollow annular structures, the outer periphery of the first rotating body is provided with a plurality of first lugs which are distributed circumferentially around the center of the first rotating body, the first lugs are provided with a plurality of mounting holes, the first rotating body is provided with an annular groove which is concentric with the corresponding axial inner side of the second rotating body, the coil is embedded in the annular groove, the outer periphery of the second rotating body is provided with a second lug, the second lug is provided with a transmission connection hole, the second rotating body is provided with a plurality of grooves which are circumferentially and uniformly distributed on the corresponding axial inner side of the first rotating body, and the metal sheet is embedded in the grooves.

2. The angle sensor of claim 1, characterized in that: The inner periphery of the second rotating body is provided with a plurality of axially extending elastic arms which are circumferentially distributed, the end of the elastic arm is provided with a plurality of radially outward buckles, the inner periphery of the first rotating body is provided with an annular inner edge, and the plurality of buckles and the annular inner edge constitute axial and radial limiting cooperation.

3. The angle sensor of claim 1, wherein: The outer periphery wall of the annular groove is provided with an opening.

4. The angle sensor of claim 1, wherein: The axial inner side of the second rotating body is provided with an annular groove which is connected to the radial inner side of the plurality of grooves, and the metal sheet comprises a plurality of protrusions embedded in the grooves and an annular connecting portion integrally connected with the plurality of protrusions.

5. The angle sensor of claim 1, wherein: The transmission connection hole is arranged to extend radially along the second rotating body and is provided with a mounting port at the radial outer end of the second lug.

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