An angle sensor gear structure

Abstract

The utility model provides a kind of angle sensor gear structure, including driving gear, the side of the driving gear is engaged with driven gear set, the driven gear set includes main gear, pinion, the pinion is connected in the below of main gear, the lower end of the main gear is fixedly connected with connecting portion, the connecting portion is symmetrically set with limit slot along the first radial direction of main gear;The inside wall of the pinion is symmetrically set with first elastic arm along second radial direction;The gear tooth on the main gear, pinion is misaligned setting;When the main gear and pinion are assembled, the first elastic arm is located in limit slot.The utility model solves the problem that current angle sensor will form angle hysteresis when gear tooth appears assembly deviation.

Description

Technical Field

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

[0002] In the application of automotive steering wheel angle sensors, the shaft in the steering wheel drives the sensor's drive gear to rotate, and the drive gear, through a meshing structure, drives two driven gears to rotate. In traditional angle sensors, the drive and driven gears are two separate parts. The meshing of the gears is greatly affected by the dimensional accuracy of the parts and assembly deviations. When there are assembly deviations between the gears, the meshing between the teeth will not be synchronized, resulting in angular hysteresis. At the same time, traditional gear axial limiting relies on a small clearance fit; if the clearance is too large, it will cause shaking and abnormal noise; if the clearance is too small, it will cause friction. Therefore, a new gear structure for angle sensors needs to be invented. Utility Model Content

[0003] The purpose of this invention is to provide a gear structure for an angle sensor, which solves the problem of angle hysteresis caused by assembly deviations in existing angle sensors.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] An angle sensor gear structure includes a housing, a PCB board connected within the housing, and a drive gear. One side of the drive gear meshes with a driven gear set, which includes a main gear and a secondary gear. The secondary gear is positioned below the main gear. A connecting portion is fixedly connected to the lower end of the main gear. Limiting grooves are symmetrically arranged along a first radial direction of the main gear. A first elastic arm is symmetrically arranged on the inner sidewall of the secondary gear along a second radial direction. The teeth on the main gear and the secondary gear are staggered. When the main gear and the secondary gear are assembled, the first elastic arm is located within the limiting groove.

[0006] Preferably, in conjunction with the above scheme, a lower limit convex ring is fixedly provided at the lower end of the main gear, the lower limit convex ring is inserted into the secondary gear, and the connecting part is fixedly connected to the lower limit convex ring.

[0007] Preferably, in conjunction with the above scheme, the connecting part is symmetrically provided with a clearance groove at a position perpendicular to the first radial direction, and the inner sidewall of the auxiliary gear is symmetrically provided with a second elastic arm at a position perpendicular to the second radial direction. The second elastic arm is used to support the main gear; when the main gear and the auxiliary gear are assembled, the second elastic arm is located in the clearance groove.

[0008] Preferably, in conjunction with the above scheme, the upper end face of the second elastic arm and the lower end face of the connecting part are interference-fitted.

[0009] Preferably, in conjunction with the above scheme, a second lower limit convex ring is fixedly provided at the lower end of the auxiliary gear, and a lower limit groove adapted to the second lower limit convex ring is provided in the outer shell; a limit post is provided at the shaft center of the main gear, the limit post is fixedly connected to the lower end of the connecting part, and the limit post is rotatably connected in the limit hole of the lower limit groove.

[0010] Preferably, in conjunction with the above scheme, an upper limit convex ring is fixedly provided at the upper end of the main gear, and the upper limit convex ring is used to limit the main gear at the lower end of the PCB board.

[0011] Preferably, in combination with the above scheme, when the main gear and the auxiliary gear are assembled, the tooth misalignment angle on the main gear and the auxiliary gear is 1.5 to 2 degrees.

[0012] Preferably, in conjunction with the above scheme, the first elastic arm is provided with arc-shaped protrusions on both the left and right sides near the head.

[0013] Preferably, in combination with the above scheme, the sidewall of the first elastic arm and the sidewall of the limiting groove are in clearance fit.

[0014] Preferably, in conjunction with the above scheme, a magnet is fixedly connected inside the main gear, and the magnet and the main gear are integrally injection molded.

[0015] The beneficial effects of this utility model are:

[0016] 1. This utility model discloses an angle sensor gear structure, which features a double-layer superimposed design for the driven gear and a staggered arrangement of the teeth of the main gear and the auxiliary gear, thus providing strong tolerance for dimensional deviations.

[0017] 2. The driven gear set in this utility model adopts a double-layer superimposed design. By opening a first limiting groove on the connection part of the main gear and setting a first elastic arm at the corresponding position of the auxiliary gear, the teeth of the main gear and the auxiliary gear are staggered. When it is engaged with the driving gear teeth, a pre-compression elastic snap-fit ​​is formed, so that the gear movement is completely consistent and there is no backlash.

[0018] 3. This utility model sets two symmetrical second elastic arms on the auxiliary gear. The upper end of the second elastic arm is interference-fitted with the lower end face of the connecting part. The second lower limit convex ring at the lower end of the auxiliary gear is positioned based on the lower limit groove of the outer shell. The main gear is pre-forced upward under the action of the second elastic arm. The upper limit convex ring at the upper end is limited by the PCB board. The contact area of ​​the convex ring is small, and there is no gap in the gear in the axial direction. At the same time, no large friction is generated, thus avoiding the problem of gap jump and abnormal noise.

[0019] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a structural diagram of an angle sensor according to the present invention.

[0021] Figure 2 This is an assembly structure diagram of the angle sensor housing, drive gear, and driven gear set in this utility model.

[0022] Figure 3 This is a structural diagram of the angle sensor housing in this utility model.

[0023] Figure 4 This is a diagram showing the fit between the drive gear and the driven gear set in this utility model.

[0024] Figure 5 This is a structural diagram of the driven gear set in this utility model.

[0025] Figure 6 This is a top view of the driven gear set in this utility model.

[0026] Figure 7 This is a bottom view of the driven gear set in this utility model.

[0027] Figure 8 This is an exploded view of the driven gear assembly in this utility model.

[0028] Figure 9 This is an exploded view of the driven gear assembly in this utility model from another direction.

[0029] Among them, 10. outer shell; 20. PCB board; 101. lower limit groove; 102. limiting hole; 1. drive gear; 2. main gear; 3. auxiliary gear; 21. first lower limit convex ring; 22. connecting part; 23. limiting groove; 24. clearance groove; 25. limiting post; 26. upper limit convex ring; 27. magnet; 31. first elastic arm; 311. protrusion; 32. second elastic arm; 33. second lower limit convex ring. Detailed Implementation

[0030] like Figures 1 to 9The angle sensor gear structure shown includes a housing 10, a PCB board 20 connected in the housing 10, and a drive gear 1. A driven gear set meshes with one side of the drive gear 1. The driven gear set includes a main gear 2 and a secondary gear 3. The secondary gear 3 is stacked below the main gear 2. A connecting part 22 is fixedly connected to the lower end of the main gear 2. The connecting part 22 includes an upper planar structure and a lower cross-shaped connecting rib structure. Limiting grooves 23 are symmetrically provided in the connecting part 22 along the first radial direction of the main gear 2. The inner sidewall of the auxiliary gear 3 is symmetrically provided with a first elastic arm 31 along the second radial direction; the teeth on the main gear 2 and the auxiliary gear 3 are misaligned; when the main gear 2 and the auxiliary gear 3 are assembled, the first elastic arm 31 is located in the limiting groove 23; when the teeth of the main gear 2 and the auxiliary gear 3 are assembled with the teeth on the drive gear 1, due to the misalignment of the teeth on the main gear 2 and the auxiliary gear 3, the first elastic arm 31 will deform slightly to one side after assembly, so that the teeth of the main gear 2 and the auxiliary gear 3 are pressed against the teeth on the drive gear 1.

[0031] To facilitate the stacking and assembly of the main gear 2 and the auxiliary gear 3, a first lower limit protrusion ring 21 is fixedly provided at the lower end of the main gear 2, and the first lower limit protrusion ring 21 is inserted into the auxiliary gear 3; the connecting part 22 is fixedly connected to the first lower limit protrusion ring 21.

[0032] To facilitate the design of the second elastic arm 32, a clearance groove 24 is symmetrically provided on the connecting part 22 at a position perpendicular to the first radial direction. A second elastic arm 32 is symmetrically provided on the inner wall of the auxiliary gear 3 at a position perpendicular to the second radial direction. The second elastic arm 32 is used to lift the main gear 2 and provide it with an upward pre-loaded clamping force. When the main gear 2 and the auxiliary gear 3 are assembled, the second elastic arm 32 is located in the clearance groove 24. This structure ensures no axial clearance between the main gear 2 and the auxiliary gear 3, and also eliminates axial clearance between the upper and lower ends of the driven gear set and the PCB board 20 and the housing 10, thus avoiding the problem of clearance jumps and abnormal noises.

[0033] In order to provide sufficient support and upward preload to the main gear, the upper end face of the second elastic arm 32 is interference-fitted with the lower end face of the connecting part 22, and the interference fit is 0.2 to 0.3 mm.

[0034] To ensure a better clearance-free fit between the driven gear set and the housing 10, and to reduce friction, a second lower limiting ring 33 is fixedly provided at the lower end of the secondary gear 3. A lower limiting groove 101 adapted to the second lower limiting ring 33 is provided in the housing 10. Lubricating oil can also be applied to the second lower limiting ring 33. A limiting post 25 is provided at the shaft center of the main gear 2. The limiting post 25 is fixedly connected to the lower end of the connecting part 22, and the limiting post 25 is rotatably connected in the limiting hole 102 of the lower limiting groove 101.

[0035] In order to enable the driven gear set to better fit and limit the PCB board 20 without gap, an upper limit ring 26 is fixedly provided on the upper end of the main gear 2. The upper limit ring 26 is used to limit the main gear 2 to the lower end of the PCB board 20.

[0036] To ensure sufficient elastic preload so that the teeth on the main gear 2 and the auxiliary gear 3 fit more tightly with the teeth on the drive gear 1, the misalignment angle of the teeth on the main gear 2 and the auxiliary gear 3 after assembly is 1.5 to 2 degrees.

[0037] In order to better accommodate the elastic deformation of the first elastic arm 31 and provide sufficient deformation space for the first elastic arm 31, the first elastic arm 31 is provided with arc-shaped protrusions 311 on both the left and right sides near the head, that is, the arc surface of the protrusion 311 and the side wall of the limiting groove 23 of the main gear 2 are in line-surface fit.

[0038] To facilitate the assembly of the first elastic arm 31 of the secondary gear 3 into the limiting groove 23 of the main gear 2, the side wall of the first elastic arm 31 and the side wall of the limiting groove 23 are in clearance fit.

[0039] In addition, a magnet 27 is fixedly connected inside the main gear 2, and the magnet 27 is integrally molded with the main gear 2. The traditional assembly method is to install the magnet into the slot or buckle of the gear after injection molding. However, after assembly by this method, the magnet is prone to slipping and rotating in the gear; due to the limited machining accuracy of the gear and the magnet, it is not possible to ensure the concentricity of the gear and the magnet, resulting in a low product qualification rate; during assembly, it may be improperly assembled or damage parts may be caused, and additional labor is also consumed. After the magnet 27 is integrally molded with the main gear 2, the main gear 2 limits the upper end face of the magnet 27 by the four sets of claws inside, and the lower end face of the magnet 27 is limited by the upper end face of the connecting part 22 and the inner side wall of the first lower limiting protrusion ring 21. Therefore, the magnet 27 is firmly fixed and will not loosen, nor will it slip or rotate in the main gear 2. The sensing chip on the PCB board 20 is correspondingly set above the magnet 27, ensuring the sensing accuracy of the product.

[0040] In the description of this utility model, it should be understood that terms such as "center," "longitudinal," "lateral," "vertical," "horizontal," "upper," "lower," "front," "rear," "left," "right," "bottom," "inner," "outer," "top," "one end," "one side," "both ends," and "both sides," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] The present invention has been described above by way of example with reference to the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations, fall within the protection scope of the present invention.

Claims

1. An angle sensor gear structure, comprising a housing (10), a PCB board (20) connected in the housing (10), and a drive gear (1), characterized in that, One side of the drive gear (1) is meshed with a driven gear set, which includes a main gear (2) and a secondary gear (3). The secondary gear (3) is located below the main gear (2). The lower end of the main gear (2) is fixedly connected to a connecting part (22). The connecting part (22) is symmetrically provided with a limiting groove (23) along the first radial direction of the main gear (2). The inner sidewall of the secondary gear (3) is symmetrically provided with a first elastic arm (31) along the second radial direction. The teeth on the main gear (2) and the secondary gear (3) are misaligned. When the main gear (2) and the secondary gear (3) are assembled, the first elastic arm (31) is located in the limiting groove (23).

2. The angle sensor gear structure according to claim 1, characterized in that, The lower end of the main gear (2) is fixedly provided with a first lower limit convex ring (21), which is inserted into the secondary gear (3), and the connecting part (22) is fixedly connected to the first lower limit convex ring (21).

3. The angle sensor gear structure according to claim 2, characterized in that, The connecting part (22) is symmetrically provided with a clearance groove (24) at a position perpendicular to the first radial direction. The inner side wall of the auxiliary gear (3) is symmetrically provided with a second elastic arm (32) at a position perpendicular to the second radial direction. The second elastic arm (32) is used to lift the main gear (2). When the main gear (2) and the auxiliary gear (3) are assembled, the second elastic arm (32) is located in the clearance groove (24).

4. The angle sensor gear structure according to claim 3, characterized in that, The upper end face of the second elastic arm (32) is interference-fitted with the lower end face of the connecting part (22).

5. The angle sensor gear structure according to claim 1, characterized in that, The lower end of the auxiliary gear (3) is fixedly provided with a second lower limit convex ring (33), and the outer shell (10) is provided with a lower limit groove (101) adapted to the second lower limit convex ring (33); a limit post (25) is provided at the shaft center of the main gear (2), the limit post (25) is fixedly connected to the lower end of the connecting part (22), and the limit post (25) is rotatably connected in the limit hole (102) of the lower limit groove (101).

6. The angle sensor gear structure according to claim 1, characterized in that, The upper end of the main gear (2) is fixedly provided with an upper limit ring (26), which is used to limit the main gear (2) to the lower end of the PCB board (20).

7. The angle sensor gear structure according to claim 1, characterized in that, When the main gear (2) and the auxiliary gear (3) are assembled, the tooth misalignment angle on the main gear (2) and the auxiliary gear (3) is 1.5 to 2 degrees.

8. The angle sensor gear structure according to claim 1, characterized in that, The first elastic arm (31) has a protrusion (311) with an arc structure on both the left and right sides near the head.

9. The angle sensor gear structure according to claim 1, characterized in that, The sidewall of the first elastic arm (31) and the sidewall of the limiting groove (23) are in clearance fit.

10. The angle sensor gear structure according to claim 1, characterized in that, The main gear (2) is internally fixedly connected to a magnet (27), and the magnet (27) and the main gear (2) are integrally injection molded.

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