Corner sensor

Abstract

The invention discloses a rotation angle sensor, and relates to the technical field of sensors, the rotation angle sensor comprises a housing, the housing is provided with a rotation pipe in a penetrating manner, the middle end of the rotation pipe is provided with a driving gear, the driving gear is located in the housing, the housing is internally provided with two driven gears and two detection circuit boards, the two driven gears are engaged with the driving gear, and the two detection circuit boards are connected with the driving gear. The number of teeth of the driving gear is different from that of the two driven gears, and the two detection circuit boards are connected with the two driven gears in a one-to-one correspondence mode. The driving gears with different tooth numbers are respectively meshed with the two driven gears, so that the detected rotation angles of the two driven gears are different and are kept in a certain proportion range, and when the rotation angles of the two driven gears are not in the certain proportion range, at least one gear is abraded, and the abrasion of the two driven gears is avoided. The detection precision of the sensor is reduced, and the sensor needs to be replaced in time, so that the error of a rotation angle detection value can be monitored.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a rotation angle sensor. Background Art

[0002] The steering angle sensor on a car is a sensor that measures or monitors the rotation angle of the steering wheel shaft of the car.

[0003] Chinese patent publication number CN211494229U discloses a rotation angle sensor, including an angle sensing unit, a circuit board, a first shell and a second shell. A receiving space is formed between the first shell and the second shell, wherein the circuit board is fixedly received in the receiving space. The angle sensing unit includes a driving gear driven by the main rotating shaft of the car steering wheel. The driving gear is rotatably connected to the first shell. The driving gear includes a cylindrical body, a gear portion extending radially outward from the cylindrical body, and a convex rib portion extending radially outward from the cylindrical body. The gear portion and the convex rib portion are located at different positions in the axial direction of the cylindrical body. The first housing includes a generally flat-plate-shaped main body, a radial limiting portion extending from the main body, and a plurality of cantilevers. The radial limiting portion is generally cylindrical, and its cylindrical inner surface coaxially surrounds the outer circumferential surface of the convex rib portion of the driving gear, or coaxially surrounds the outer circumferential surface of the cylindrical body of the driving gear. The cantilever is formed with a barb facing the upper end surface of the convex rib portion. However, wear is prone to occur during the rotation of the driven gear driven by the driving gear, resulting in reduced transmission accuracy, that is, an increase in the rotation angle measurement error, and it is difficult to detect in time.

[0004] Therefore, a rotation angle sensor is needed to monitor the error of the rotation angle detection value. Summary of the Invention

[0005] The object of the present invention is to solve the above technical problems and provide a rotation angle sensor capable of monitoring the error of the rotation angle detection value.

[0006] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the present invention is: a rotation angle sensor, including a shell, a rotating tube is passed through the shell, a driving gear is installed at the middle end of the rotating tube, the driving gear is located in the shell, two driven gears and two detection circuit boards are provided in the shell, the two driven gears are engaged with the driving gear, the number of teeth of the driving gear and the two driven gears are different, the two detection circuit boards are connected to the two driven gears in a one-to-one correspondence, and when the rotation angle ratio measured by the two detection circuit boards exceeds a preset threshold range, it is determined that at least one gear is worn.

[0007] Preferably, the housing is provided with two wiring ports, and the two wiring ports correspond one to one with the two detection circuit boards.

[0008] Preferably, the two driven gears are arranged side by side.

[0009] Preferably, a plurality of strip grooves are provided on the inner wall of the rotating tube, both ends of the strip grooves extend to both ends of the rotating tube, a rubber strip is provided in each strip groove, and both ends of the rotating tube are provided with an extrusion mechanism.

[0010] Preferably, the plurality of strip-shaped grooves are distributed circumferentially with the axis of the rotating tube as the center.

[0011] Preferably, the distance between the rubber strip and the axis of the rotating tube is times greater than the inner diameter of the rotating tube.

[0012] Preferably: the extrusion mechanism includes a locking ring, which is coaxially arranged with the rotating tube, a gap is provided between the rotating tube and the locking ring, the locking ring is detachably connected to the rotating tube by a plurality of second screws, a plurality of extrusion rods are fixedly provided on one side of the locking ring close to the rotating tube, the plurality of extrusion rods correspond to and match the strip grooves one by one, one end of the extrusion rod is provided on the locking ring, the other end of the extrusion rod is inserted into the strip groove, and the distance between the extrusion rod and the axis of the rotating tube is greater than the inner diameter of the rotating tube.

[0013] Preferably, the inner diameter of the locking ring is larger than the inner diameter of the rotating tube.

[0014] Preferably, the housing is composed of a first shell and a second shell, and the first shell and the second shell are detachably fixedly connected.

[0015] Preferably, the first shell and the second shell are connected by a plurality of first screws.

[0016] Compared with the traditional structure, the beneficial effects of the present invention are as follows: by meshing driving gears with different numbers of teeth with two driven gears respectively, the detected rotation angles of the two driven gears are different and maintained within a certain proportional range. When the rotation angles of the two driven gears are not within a certain proportional range, it can be concluded that at least one gear has been worn, the detection accuracy of the sensor is reduced, and the sensor needs to be replaced in time, that is, the error of the rotation angle detection value can be monitored. In addition, by squeezing the rubber strip so that the rubber strip is against the steering wheel shaft, the stability of the fixation of the steering wheel shaft and the rotating tube can be improved, and the steering wheel shaft and the rotating shaft can be prevented from slipping and affecting the angle detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the internal structure of the housing of the present invention; In the figure: 1. outer shell, 11. first shell, 12. second shell, 13. first screw, 2. rotating tube, 3. driving gear, 4. driven gear, 5. detection circuit board, 6. wiring port, 7. strip groove, 8. rubber strip, 9. squeezing mechanism, 91. locking ring, 92. second screw, 93. squeezing rod. DETAILED DESCRIPTION

[0018] The present invention will be further described below.

[0019] Refer to the attached Figure 1-3 , a rotation angle sensor, including a housing 1, the housing 1 consists of a first shell 11 and a second shell 12, the first shell 11 and the second shell 12 are detachably fixedly connected by a plurality of first screws 13, the housing 1 is provided with a rotating tube 2, the middle end of the rotating tube 2 is installed with a driving gear 3, the driving gear 3 is located in the housing 1, two driven gears 4 and two detection circuit boards 5 are provided in the housing 1, the two driven gears 4 are arranged side by side, the two driven gears 4 are meshed with the driving gear 3, the number of teeth of the driving gear 3 and the two driven gears 4 are different, the two detection circuit boards 5 are connected to the two driven gears 4 in a one-to-one correspondence, the housing 1 is provided with two wiring ports 6, the two wiring ports 6 correspond to the two detection circuit boards 5 in a one-to-one correspondence, the steering wheel rotation axis coaxially passes through the rotating tube 2 and is connected to the rotating tube 2 is fixedly connected. During the rotation of the steering wheel shaft, the rotating tube 2 is driven to rotate synchronously, and the driving gear 3 is driven to rotate at the same time. The rotation of the driving gear 3 drives the driven gear 4 to rotate, and the rotation angle of the driven gear 4 is detected by the corresponding detection circuit board 5. That is, the rotation angle of the steering wheel shaft can be calculated by the detection circuit board 5. Because the number of teeth of the driving gear 3 and the two driven gears 4 are different, the rotation angle values ​​of the two driven gears 4 detected by the two detection circuit boards 5 are kept within a certain proportional range. When the driving gear 3 and the driven gear 4 are worn, and the angle values ​​detected by the two detection circuit boards 5 exceed the certain proportional range, it can be concluded that at least one gear has been worn, the detection accuracy of the sensor has decreased, and the sensor needs to be replaced in time. That is, the error of the rotation angle detection value can be monitored.

[0020] A plurality of strip grooves 7 are provided on the inner wall of the rotating tube 2. The plurality of strip grooves 7 are circumferentially distributed with the axis of the rotating tube 2 as the center. The two ends of the strip grooves 7 extend to the two ends of the rotating tube 2. A rubber strip 8 is provided in each strip groove 7. The distance between the rubber strip 8 and the axis of the rotating tube 2 is twice greater than the inner diameter of the rotating tube 2. An extrusion mechanism 9 is provided at both ends of the rotating tube 2. After the steering wheel shaft passes through the rotating tube 2, the rubber strip 8 is squeezed by the two extrusion mechanisms 9, so that the rubber strip 8 is deformed toward the direction close to the axis of the rotating tube 2 and the rubber strip 8 is abutted against the steering wheel shaft, thereby improving the reliability of the fixation between the steering wheel shaft and the rotating tube 2 and preventing slipping from affecting the detection accuracy. In addition, the strip grooves 7 can also increase the friction between the steering wheel shaft and the rotating tube 2, that is, the reliability of the fixation between the steering wheel shaft and the rotating tube 2 can be further improved.

[0021] The extrusion mechanism 9 includes a locking ring 91, which is coaxially arranged with the rotating tube 2. A gap is provided between the rotating tube 2 and the locking ring 91. The inner diameter of the locking ring 91 is larger than the inner diameter of the rotating tube 2. The locking ring 91 is detachably connected to the rotating tube 2 by a plurality of second screws 92. A plurality of extrusion rods 93 are fixedly provided on the side of the locking ring 91 close to the rotating tube 2. The plurality of extrusion rods 93 correspond to and match the strip grooves 7 one by one. One end of the extrusion rod 93 is provided on the locking ring 91, and the other end of the extrusion rod 93 is inserted into the strip groove 7. The distance between the extrusion rod 93 and the axis of the rotating tube 2 is twice greater than the inner diameter of the rotating tube 2. The steering wheel rotating shaft passes through the rotating tube 2 and the two locking rings 91 in sequence. Afterwards, the second screw 92 is tightened to move the locking ring 91 toward the direction close to the rotating tube 2, that is, the two extrusion rods 93 in the same strip groove 7 can be moved close to each other and squeeze the rubber strip 8.

[0022] The above embodiments of the present invention are merely examples to clearly illustrate the present invention, but are not intended to limit the scope of protection of the present invention. All equivalent technical solutions also fall within the scope of the present invention. The scope of patent protection of the present invention should be defined by the claims.

Claims

1. A rotation angle sensor, comprising a housing (1), characterized in that: The housing (1) is provided with a rotating tube (2), a driving gear (3) is installed at the middle end of the rotating tube (2), the driving gear (3) is located in the housing (1), two driven gears (4) and two detection circuit boards (5) are provided in the housing (1), the two driven gears (4) are meshed with the driving gear (3), the driving gear (3) and the two driven gears (4) have different numbers of teeth, and the two detection circuit boards (5) are connected to the two driven gears (4) in a one-to-one correspondence.

2. The rotation angle sensor according to claim 1, characterized in that: Two wiring ports (6) are provided on the housing (1), and the two wiring ports (6) correspond one to one with the two detection circuit boards (5).

3. The rotation angle sensor according to claim 1, characterized in that: The two driven gears (4) are arranged side by side.

4. The rotation angle sensor according to claim 1, characterized in that: A plurality of strip grooves (7) are provided on the inner wall of the rotating tube (2), and both ends of the strip grooves (7) extend to both ends of the rotating tube (2). A rubber strip (8) is provided in each strip groove (7), and both ends of the rotating tube (2) are provided with an extrusion mechanism (9).

5. The rotation angle sensor according to claim 4, characterized in that: The plurality of strip-shaped grooves (7) are distributed circumferentially with the axis of the rotating tube (2) as the center.

6. The rotation angle sensor according to claim 4, characterized in that: The distance between the rubber strip (8) and the axis of the rotating tube (2) is twice greater than the inner diameter of the rotating tube (2).

7. The rotation angle sensor according to claim 4, characterized in that: The extrusion mechanism (9) includes a locking ring (91), the locking ring (91) is coaxially arranged with the rotating tube (2), a gap is provided between the rotating tube (2) and the locking ring (91), the locking ring (91) is detachably connected to the rotating tube (2) via a plurality of second screws (92), a plurality of extrusion rods (93) are fixedly provided on one side of the locking ring (91) close to the rotating tube (2), the plurality of extrusion rods (93) correspond to and match the strip grooves (7) one by one, one end of the extrusion rod (93) is provided on the locking ring (91), the other end of the extrusion rod (93) is inserted into the strip groove (7), and twice the distance between the extrusion rod (93) and the axis of the rotating tube (2) is greater than the inner diameter of the rotating tube (2).

8. The rotation angle sensor according to claim 7, characterized in that: The inner diameter of the locking ring (91) is larger than the inner diameter of the rotating tube (2).

9. The rotation angle sensor according to claim 1, characterized in that: The housing (1) consists of a first shell (11) and a second shell (12), and the first shell (11) and the second shell (12) are detachably fixedly connected.

10. The rotation angle sensor according to claim 9, characterized in that: The first shell (11) and the second shell (12) are connected via a plurality of first screws (13).

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