A corner sensor

Abstract

The utility model discloses a corner sensor relates to sensor technical field, including the shell, is equipped with the rotation pipe on the shell, the middle end of rotation pipe is installed with drive gear, and drive gear is located in the shell, be provided with two driven gears and two detection circuit boards in the shell, two driven gears all are engaged with drive gear, and the number of teeth of drive gear and two driven gears is various, and two detection circuit boards and two driven gears one -to -one corresponding connection. The utility model discloses through the drive gear of the number of teeth various is engaged with two driven gears respectively, makes the rotation angle of two driven gears detected not and keeps in certain proportional range, when two driven gears rotation angle not in certain proportional range, then can draw, at least one gear has worn, and the sensor detection accuracy reduces, needs timely replacement sensor, can realize the monitoring to rotation angle detection value error.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to an angle sensor. Background Technology

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

[0003] Chinese Patent Publication No. CN211494229U discloses an angle sensor, including an angle sensing unit, a circuit board, a first housing, and a second housing. A receiving space is formed between the first housing and the second housing, wherein the circuit board is fixedly housed in the receiving space. The angle sensing unit includes a drive gear driven by the main rotation shaft of a car steering wheel. The drive gear is rotatably connected to the first housing. The drive gear includes a cylindrical body, a gear portion extending radially outward from the cylindrical body, and a rib portion extending radially outward from the cylindrical body. The gear portion and the rib portion are located at different positions in the axial direction of the cylindrical body. The first housing includes a generally flat main body, a radial limiting part extending from the main body, and several cantilever arms. The radial limiting part is generally cylindrical, and its cylindrical inner surface coaxially surrounds the outer circumferential surface of the rib of the driving gear, or coaxially surrounds the outer circumferential surface of the cylindrical body of the driving gear. The cantilever arms are formed with barbs facing the upper end face of the rib. However, wear is prone to occur during the rotation of the driven gear by the driving gear, resulting in a decrease in transmission accuracy, that is, an increase in the measurement error of the rotation angle, which is difficult to detect in time.

[0004] Therefore, an angle sensor is needed to monitor the error of the detected rotation angle. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems and provide an angle sensor that can monitor the error of the rotation angle detection value.

[0006] To achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by this utility model is as follows: an angle sensor, including a housing, a rotating tube passing through the housing, a drive gear installed at the middle end of the rotating tube, the drive gear being located inside the housing, two driven gears and two detection circuit boards being arranged inside the housing, the two driven gears meshing with the drive gear, the number of teeth of the drive gear and the two driven gears being different, the two detection circuit boards being connected to the two driven gears one-to-one, when the ratio of the rotation angles 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 outer casing is provided with two wiring ports, and the two wiring ports correspond one-to-one with two detection circuit boards.

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

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

[0010] Preferably, multiple strip grooves are distributed circumferentially around the axis of the rotating tube.

[0011] Preferably, the distance between the rubber strip and the axis of the rotating tube is 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 multiple second screws. Multiple extrusion rods are fixedly arranged on the side of the locking ring near the rotating tube. The multiple extrusion rods correspond one-to-one with the strip grooves. One end of the extrusion rod is set on the locking ring, and the other end of the extrusion rod is inserted into the strip groove. 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 outer casing consists of a first housing and a second housing, which are detachably and fixedly connected.

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

[0016] Compared with the traditional structure, the beneficial effects of this utility model are as follows: By meshing the drive gears with different numbers of teeth with two driven gears respectively, the rotation angles of the two driven gears detected are different but kept 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. This can achieve the monitoring of the error of the rotation angle detection value. In addition, by squeezing the rubber strip, the rubber strip is pressed against the steering wheel rotation shaft, which can improve the stability of the steering wheel rotation shaft and the rotation tube fixing, and prevent slippage between the steering wheel rotation shaft and the rotation shaft, which would affect the angle detection accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; 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 this utility model; In the diagram: 1. Outer shell, 11. First shell, 12. Second shell, 13. First screw, 2. Rotating tube, 3. Drive gear, 4. Driven gear, 5. Detection circuit board, 6. Wiring port, 7. Strip groove, 8. Rubber strip, 9. Extrusion mechanism, 91. Locking ring, 92. Second screw, 93. Extrusion rod. Detailed Implementation

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

[0019] See attached document Figure 1-3 A steering angle sensor includes a housing 1, which is composed of a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are detachably and fixedly connected by a plurality of first screws 13. A rotating tube 2 passes through the housing 1, and a drive gear 3 is installed at the middle end of the rotating tube 2. The drive gear 3 is located inside the housing 1. Two driven gears 4 and two detection circuit boards 5 are arranged inside the housing 1. The two driven gears 4 are arranged side by side and both of them mesh with the drive gear 3. The number of teeth of the drive gear 3 and the two driven gears 4 are different. The two detection circuit boards 5 are connected to the two driven gears 4 one-to-one. The housing 1 is provided with two wiring ports 6, which correspond one-to-one with the two detection circuit boards 5. A steering wheel rotation shaft passes coaxially through the rotating tube 2 and is connected to the rotating tube. 2. Fixed connection. During the rotation of the steering wheel shaft, the rotating tube 2 rotates synchronously, which in turn drives the drive gear 3 to rotate. The rotation of the drive 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. Since the number of teeth of the drive 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 drive gear 3 and the driven gear 4 are worn, and the angle values ​​detected by the two detection circuit boards 5 exceed a 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. This can realize the monitoring of the error of the rotation angle detection value.

[0020] Multiple strip grooves 7 are provided on the inner wall of the rotating tube 2. The multiple 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. Each strip groove 7 is provided with a rubber strip 8. The distance between the rubber strip 8 and the axis of the rotating tube 2 is more than twice the inner diameter of the rotating tube 2. Both ends of the rotating tube 2 are provided with extrusion mechanisms 9. After the steering wheel rotating shaft passes through the rotating tube 2, the rubber strip 8 is extruded by the two extrusion mechanisms 9, causing the rubber strip 8 to deform towards the axis of the rotating tube 2 and to abut against the steering wheel rotating shaft. This can improve the reliability of the fixation between the steering wheel rotating shaft and the rotating tube 2, prevent slippage and affect the detection accuracy. In addition, the strip grooves 7 can also increase the friction between the steering wheel rotating shaft and the rotating tube 2, which can further improve the reliability of the fixation between the steering wheel rotating shaft and the rotating tube 2.

[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 multiple second screws 92. Multiple extrusion rods 93 are fixedly arranged on the side of the locking ring 91 near the rotating tube 2. The multiple extrusion rods 93 correspond one-to-one with the strip groove 7. One end of the extrusion rod 93 is set 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 rotation shaft passes through the rotating tube 2 and the two locking rings 91 in sequence. Then, the second screws 92 are tightened to move the locking ring 91 towards the rotating tube 2, so that the two extrusion rods 93 in the same strip groove 7 can move closer and extrude the rubber strip 8.

[0022] The above embodiments of this utility model are merely examples to clearly illustrate this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent technical solutions also fall within the scope of this utility model, and the patent protection scope of this utility model should be defined by each claim.

Claims

1. An angle sensor, comprising a housing (1), characterized in that: A rotating tube (2) is installed on the outer shell (1). A drive gear (3) is installed at the middle end of the rotating tube (2). The drive gear (3) is located inside the outer shell (1). Two driven gears (4) and two detection circuit boards (5) are provided inside the outer shell (1). Both driven gears (4) mesh with the drive gear (3). The number of teeth of the drive gear (3) and the two driven gears (4) are different. The two detection circuit boards (5) are connected to the two driven gears (4) one by one.

2. The angle sensor according to claim 1, characterized in that: The outer casing (1) is provided with two wiring ports (6), and the two wiring ports (6) correspond one-to-one with the two detection circuit boards (5).

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

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

5. The angle sensor according to claim 4, characterized in that: Multiple strip grooves (7) are circumferentially distributed around the axis of the rotating tube (2).

6. The 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 the size of the inner diameter of the rotating tube (2).

7. The angle sensor according to claim 4, characterized in that: The extrusion mechanism (9) includes a locking ring (91), which is coaxially arranged with the rotating tube (2). There is a gap between the rotating tube (2) and the locking ring (91). 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 arranged on the side of the locking ring (91) near the rotating tube (2). The plurality of extrusion rods (93) correspond one-to-one with the strip groove (7). One end of the extrusion rod (93) is set 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).

8. The 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 angle sensor according to claim 1, characterized in that: The outer shell (1) is composed of a first shell (11) and a second shell (12), which are detachably and fixedly connected.

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

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