Angle sensor gear structure
Through the double-layer superposition design and misaligned driven gear set, the angle hysteresis and gap noise problems of the angle sensor during assembly deviation are solved, and the synchronous movement and gapless coordination of the gear are achieved, which improves the induction accuracy and reliability.
Patent Information
- Application Number
- CN202510654711.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2025-08-19
AI Technical Summary
Existing angle sensors are prone to angular hysteresis when gear teeth are assembled, and traditional limiting methods lead to excessive gaps that may cause shaking noises or friction.
The driven gear set adopts a double-layer superposition design, the main gear and the sub-gear teeth are arranged in a dislocation, and a limit groove is provided at the main gear connection part. The inner wall of the sub-gear is equipped with an elastic arm, and the synchronous movement of the gear is achieved through the pre-pressure and clamping of the elastic arm, while there is no gap or friction in the axial direction.
It effectively solves the problems of angle hysteresis and gap abnormal noise, realizes the synchronization of gear movement and gapless coordination, and improves the induction accuracy and reliability of the product.
Smart Images
Figure CN120503876A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of angle sensors, and in particular to a gear structure of an angle sensor. Background Art
[0002] In automotive steering wheel angle sensors, a rotating shaft in the steering wheel rotates the sensor's drive gear, which in turn rotates two driven gears through a meshing structure. Traditional angle sensors use separate drive and driven gears, each of which is a single component. The tooth-to-tooth fit is significantly affected by component dimensional accuracy and assembly deviations. Assembly deviations between gears can cause misalignment, resulting in angular hysteresis. Furthermore, traditional gear axial limits rely on a small clearance. Excessive clearance can produce jitter and noise, while too little can cause friction. Therefore, a new gear structure for angle sensors is needed. Summary of the Invention
[0003] The purpose of the present invention is to provide an angle sensor gear structure to solve the problem that angle hysteresis is generated when assembly deviation occurs in the gear teeth of the existing angle sensor.
[0004] The technical solution adopted by the present invention to solve its technical problem is:
[0005] An angle sensor gear structure includes a housing, a PCB board connected to the housing, and a driving gear. A driven gear set is meshed with one side of the driving gear. The driven gear set includes a main gear and a sub-gear. The sub-gear is arranged below the main gear. A connecting portion is fixedly connected to the lower end of the main gear. The connecting portion is symmetrically provided with a limiting groove along a first radial direction of the main gear; the inner side wall of the sub-gear is symmetrically provided with a first elastic arm along a second radial direction; the gear teeth on the main gear and the sub-gear are staggered; when the main gear and the sub-gear are assembled, the first elastic arm is located in the limiting groove.
[0006] Preferably, in combination with the above solution, a lower limit convex ring is fixedly provided on the lower end of the main gear, the lower limit convex ring is inserted into the sub-gear, and the connecting portion is fixedly connected to the lower limit convex ring.
[0007] Preferably, in combination with the above scheme, a avoidance groove is symmetrically provided on the connecting portion at a position perpendicular to the first radial direction, and a second elastic arm is symmetrically provided on the inner side wall of the sub-gear at a position perpendicular to the second radial direction, and the second elastic arm is used to lift the main gear; when the main gear and the sub-gear are assembled, the second elastic arm is located in the avoidance groove.
[0008] Preferably, in combination with the above solution, the upper end surface of the second elastic arm is interference fit with the lower end surface of the connecting portion.
[0009] Preferably, in combination with the above scheme, a second lower limit convex ring is fixedly provided at the lower end of the secondary gear, and a lower limit groove adapted to the second lower limit convex ring is provided in the outer shell; a limit column is provided at the axis center of the main gear, the limit column is fixedly connected to the lower end of the connecting part, and the limit column is rotatably connected to the limit hole of the lower limit groove.
[0010] Preferably, in combination with the above solution, an upper limit convex ring is fixedly provided on 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 solution, when the main gear and the sub-gear are assembled, the gear teeth misalignment angle on the main gear and the sub-gear is 1.5 to 2 degrees.
[0012] Preferably, in combination with the above solution, both left and right sides of the first elastic arm close to the head are provided with raised portions with an arc structure.
[0013] Preferably, in combination with the above solution, the side wall of the first elastic arm and the side wall of the limiting groove are clearance-fitted.
[0014] Preferably, in combination with the above solution, a magnet is fixedly connected to the interior of the main gear, and the magnet and the main gear are integrally formed by injection molding.
[0015] Beneficial effects of the present invention:
[0016] 1. The angle sensor gear structure of the present invention has a strong tolerance to dimensional deviation by designing a double-layer stacking of the driven gear and staggering the main gear and the auxiliary gear teeth.
[0017] 2. The driven gear set in the present invention adopts a double-layer superposition design. By opening a first limiting groove on the connecting part of the main gear, setting a first elastic arm at the corresponding position of the sub-gear, and staggering the main gear and sub-gear teeth, a pre-stressed elastic snap connection is formed when it cooperates with the driving gear teeth, so that the gear movement is completely consistent and there is no clearance.
[0018] 3. The present invention provides two symmetrical second elastic arms on the secondary gear. The upper ends of the second elastic arms are interference fit with the lower end surface of the connecting portion. The second lower limit convex ring at the lower end of the secondary gear is positioned as a reference by the lower limit groove of the housing. The main gear is pre-stressed upward under the action of the second elastic arms, and 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 between the gears in the axial direction. At the same time, no large friction is generated, thereby 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. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a structural diagram of an angle sensor in the present invention.
[0021] Figure 2 This is an assembly diagram of the angle sensor housing, the driving gear, and the driven gear set in the present invention.
[0022] Figure 3 This is a structural diagram of the angle sensor housing in the present invention.
[0023] Figure 4 This is a diagram of the matching structure of the driving gear and the driven gear set in the present invention.
[0024] Figure 5 This is a structural diagram of the driven gear set in the present invention.
[0025] Figure 6 It is a top view of the driven gear set in the present invention.
[0026] Figure 7 It is a bottom view of the driven gear set in the present invention.
[0027] Figure 8 This is an exploded view of the driven gear set in the present invention.
[0028] Figure 9 This is an exploded view of the driven gear set in the present invention from another direction.
[0029] Among them, 10. Housing; 20. PCB board, 101. Lower limit groove; 102. Limit hole; 1. Drive gear; 2. Main gear; 3. Sub-gear; 21. First lower limit convex ring; 22. Connecting part; 23. Limit groove; 24. Avoidance groove; 25. Limit column; 26. Upper limit convex ring; 27. Magnet; 31. First elastic arm; 311. Protrusion; 32. Second elastic arm; 33. Second lower limit convex ring. DETAILED DESCRIPTION
[0030] like Figures 1 to 9The angle sensor gear structure shown includes a housing 10, a PCB board 20 connected to the housing 10, and a drive gear 1. One side of the drive gear 1 is meshed with a driven gear set. The driven gear set includes a main gear 2 and a sub-gear 3. The sub-gear 3 is stacked and arranged below the main gear 2. The lower end of the main gear 2 is fixedly connected to a connecting portion 22. The connecting portion 22 includes a planar structure at the top and a cross-shaped connecting rib structure at the bottom. The connecting portion 22 is symmetrically provided with limiting grooves 23 along a first radial direction of the main gear 2. The inner side wall of the sub-gear 3 is symmetrically provided with a first elastic arm 31 along the second radial direction; the gear teeth on the main gear 2 and the sub-gear 3 are staggered; when the main gear 2 and the sub-gear 3 are assembled, the first elastic arm 31 is located in the limiting groove 23; when the gear teeth of the main gear 2 and the sub-gear 3 are assembled with the gear teeth on the driving gear 1, due to the staggered gear teeth on the main gear 2 and the sub-gear 3, the first elastic arm 31 will be slightly deformed to one side after assembly, so that the gear teeth of the main gear 2 and the sub-gear 3 are pressed tightly against the gear teeth on the driving gear 1.
[0031] In order to facilitate the stacking, assembly and positioning of the main gear 2 and the sub-gear 3, a first lower limit convex ring 21 is fixedly provided at the lower end of the main gear 2, and the first lower limit convex ring 21 is inserted into the sub-gear 3; the connecting portion 22 is fixedly connected to the first lower limit convex ring 21.
[0032] To facilitate the avoidance design of the second elastic arm 32, the connecting portion 22 is symmetrically provided with avoidance grooves 24 at positions perpendicular to the first radial direction. The inner sidewall of the secondary gear 3 is symmetrically provided with second elastic arms 32 at positions perpendicular to the second radial direction. The second elastic arms 32 are used to support the main gear 2 and provide a preloaded upward pressure on the main gear 2. When the main gear 2 and secondary gear 3 are assembled, the second elastic arms 32 are located in the avoidance grooves 24. This structure eliminates axial clearance between the main gear 2 and secondary gear 3, and also eliminates axial clearance between the upper and lower ends of the driven gear set and the PCB board 20 and housing 10, thus avoiding problems with clearance jump and abnormal noise.
[0033] In order to provide sufficient support and upward pre-tightening force for the main gear, the upper end surface of the second elastic arm 32 is interference-fitted with the lower end surface of the connecting portion 22 , and the interference fit amount is 0.2-0.3 mm.
[0034] In order to enable the driven gear set to better fit and limit with the housing 10 without clearance and reduce friction, a second lower limit convex ring 33 is fixedly provided at the lower end of the secondary gear 3, and a lower limit groove 101 adapted to the second lower limit convex ring 33 is provided in the housing 10, and lubricating oil can also be applied to the second lower limit convex ring 33; a limiting column 25 is provided at the axis center of the main gear 2, and the limiting column 25 is fixedly connected to the lower end of the connecting part 22, and the limiting column 25 is rotatably connected to the limiting hole 102 of the lower limit groove 101.
[0035] In order to enable the driven gear set to better fit and limit the position with no clearance between the driven gear set and the PCB board 20, an upper limit convex ring 26 is fixedly provided on the upper end of the main gear 2. The upper limit convex ring 26 is used to limit the main gear 2 to the lower end of the PCB board 20.
[0036] In order to ensure sufficient elastic preload force so that the gear teeth on the main gear 2 and the sub-gear 3 fit more closely with the gear teeth of the driving gear 1, when the main gear 2 and the sub-gear 3 are assembled, the gear teeth misalignment angle on the main gear 2 and the sub-gear 3 is 1.5 to 2 degrees.
[0037] In order to better adapt to 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 a raised portion 311 with an arc structure on both the left and right sides close to the head, that is, the arc surface of the raised portion 311 is matched with the side wall of the limiting groove 23 of the main gear 2 in a line-surface manner.
[0038] In order 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 is clearance-fitted with the side wall of the limiting groove 23 .
[0039] In addition, a magnet 27 is fixedly connected to the main gear 2 and integrally formed with the main gear 2 through injection molding. Conventional assembly methods involve inserting the magnet into the gear's slots or clips after injection molding. However, this assembly method can easily cause the magnet to slip and rotate within the gear. Due to limitations in the machining precision of the gear and magnet, concentricity between the gear and magnet cannot be guaranteed, resulting in a low product yield. Assembly can also result in improper assembly or damage to parts, and additional labor is required. However, after the magnet 27 is integrally molded with the main gear 2, the main gear 2 retains the upper end face of the magnet 27 via four internal sets of claws, while the lower end face of the magnet 27 is retained by the upper end face of the connecting portion 22 and the inner sidewall of the first lower retaining ring 21. This ensures that the magnet 27 is securely fixed and prevents loosening, slipping, or rotating within the main gear 2. The sensor chip on the PCB 20 is positioned above the magnet 27, ensuring accurate sensing.
[0040] In the description of the present invention, it should be understood that the terms such as "center", "longitudinal", "lateral", "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "bottom", "inside", "outside", "top", "one end", "one side", "two ends", "both sides", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.
[0042] The present invention has been described above with reference to the accompanying drawings. It is clear that the specific implementation of the present invention is not limited to the above-described method. Any improvements made using the method concepts and technical solutions of the present invention, or any direct application to other situations, fall within the scope of protection of the present invention.
Claims
1. An angle sensor gear structure, comprising a housing (10), a PCB board (20) connected to the housing (10), and a drive gear (1), characterized in that: A driven gear set is meshed with one side of the driving gear (1), and the driven gear set includes a main gear (2) and a sub-gear (3). The sub-gear (3) is arranged below the main gear (2). The lower end of the main gear (2) is fixedly connected with a connecting portion (22), and the connecting portion (22) is symmetrically provided with a limiting groove (23) along a first radial direction of the main gear (2); the inner side wall of the sub-gear (3) is symmetrically provided with a first elastic arm (31) along a second radial direction; the gear teeth on the main gear (2) and the sub-gear (3) are staggered; when the main gear (2) and the sub-gear (3) are assembled, the first elastic arm (31) is located in the limiting groove (23).
2. The rocker reinforcement plate assembly structure according to claim 1, characterized in that: A first lower limit convex ring (21) is fixedly provided at the lower end of the main gear (2), the first lower limit convex ring (21) is inserted into the auxiliary gear (3), and the connecting portion (22) is fixedly connected to the first lower limit convex ring (21).
3. The rocker reinforcement plate assembly structure according to claim 2, characterized in that: A avoidance groove (24) is symmetrically provided on the connecting portion (22) at a position perpendicular to the first radial direction, and a second elastic arm (32) is symmetrically provided on the inner side wall of the sub-gear (3) 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 sub-gear (3) are assembled, the second elastic arm (32) is located in the avoidance groove (24).
4. The rocker reinforcement plate assembly structure according to claim 3, characterized in that: The upper end surface of the second elastic arm (32) is interference-fitted with the lower end surface of the connecting portion (22).
5. The rocker reinforcement plate assembly structure according to claim 1, characterized in that: A second lower limiting convex ring (33) is fixedly provided at the lower end of the secondary gear (3), and a lower limiting groove (101) adapted to the second lower limiting convex ring (33) is provided in the housing (10); a limiting column (25) is provided at the axis of the main gear (2), the limiting column (25) is fixedly connected to the lower end of the connecting portion (22), and the limiting column (25) is rotatably connected to the limiting hole (102) of the lower limiting groove (101).
6. The rocker reinforcement plate assembly structure according to claim 1, wherein: An upper limit convex ring (26) is fixedly provided at the upper end of the main gear (2), and the upper limit convex ring (26) is used to limit the main gear (2) at the lower end of the PCB board (20).
7. The rocker reinforcement plate assembly structure according to claim 1, wherein: When the main gear (2) and the sub-gear (3) are assembled, the gear teeth misalignment angle on the main gear (2) and the sub-gear (3) is 1.5 to 2 degrees.
8. The rocker reinforcement plate assembly structure according to claim 1, wherein: The first elastic arm (31) is provided with raised portions (311) with an arc structure on both the left and right sides close to the head.
9. The rocker reinforcement plate assembly structure according to claim 1, wherein: The side wall of the first elastic arm (31) and the side wall of the limiting groove (23) are clearance-fitted.
10. The rocker reinforcement plate assembly structure according to claim 1, wherein: A magnet (27) is fixedly connected to the interior of the main gear (2), and the magnet (27) and the main gear (2) are integrally formed by injection molding.