Limiting structure for improving measurement angle precision of torque angle sensor

Abstract

The utility model discloses a limiting structure for improving the angle measurement precision of a torque angle sensor, relates to the field of torque sensors, and solves the problem that the design precision of an existing limiting structure does not reach the standard to affect the working precision of a sensor gear and a torque sensor on the sensor gear. According to the scheme, the device comprises a gear cover and a sensor gear assembled on the inner side of the gear cover; a limiting structure located between the gear cover and the sensor gear is fixedly installed on the inner side of the gear cover. The limiting structure is composed of a kidney-shaped circular ring on the top side and two sets of cantilever ribs on the bottom side. According to the limiting structure for improving the measurement angle precision of the torque angle sensor, the bottom of the limiting structure can have a supporting effect through the arrangement of the waist-shaped circular ring, and meanwhile, the limiting structure has elasticity capable of being compressed and rebounded up and down to a certain degree through the arrangement of the shape of the cantilever rib; therefore, the elasticity can avoid hard-to-hard strong friction between the upper end face and the lower circumferential face, and the situation that the rotation effect of the sensor gear and the limiting structure is poor is synchronously avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of torque sensors, in particular to a limiting structure for improving the angle measurement accuracy of a torque angle sensor. Background Art

[0002] Torque sensor is the detection of torsional moment perception on various rotating or non-rotating mechanical parts. Torque sensor can be applied to the following fields: high-precision CNC machine tools, AI industrial robot control, electronic clutch, vehicle speed calculation and various motor control, etc., mostly used to detect the steering torque and angle of the vehicle steering wheel. Torque angle sensor includes torque sensing unit, angle sensing unit and PCB board; the accuracy of measuring angle of torque angle sensor on the market needs to be improved. Torque angle sensor is used to the later stage of design life. With the extension of product working time and encountering harsh working conditions, the function and stability of the material and structural mechanics of some key parts of the sensor will decrease, which will eventually lead to a decrease in sensor accuracy, thereby weakening the stability and reliability of the electric power system and making the driving steering operation experience worse. By defining the material of the gear cover part on the upper part of the sensor, designing a limit structure on the gear cover part that matches the pinion (including magnet) and determining the relevant size requirements, the matching accuracy between the internal moving parts of the sensor (the pinion is the transmission part) can be improved (mainly controlling the axial activity space range of the pinion), thereby improving the accuracy of the angle measurement of the sensor;

[0003] After searching, the application with patent number 202222691627.9 discloses a torque angle sensor limiting structure, including a slot, a limiting structure body, and a cantilever spring piece. The limiting structure body is arranged on the side of the base of the torque angle sensor, and a slot is provided on the chassis. One side of the limiting structure body is provided with a limiting surface one, and the other side of the limiting structure body is provided with a cantilever spring piece and a limiting surface two. The root of the cantilever spring piece is connected to the limiting structure body, and the root of the cantilever spring piece is provided with a reinforcing rib, and the limiting structure body is inserted into the slot. Compared with the prior art, the utility model is provided with a single-sided cantilever spring piece, which has a simple structure; the reinforcing rib improves the strength and rigidity of the cantilever spring piece to avoid cracking at the root after fatigue endurance; the precise angle shaking gap after the limiting structure is installed improves the quality of the torque signal; the limiting surface two is set as a hard limit surface, so as to control the elastic force value range of the cantilever spring piece and avoid the problem of excessive internal friction torque of the torque angle sensor;

[0004] The above application document realizes limiting by setting the side cantilever spring piece and reinforcing ribs, but the side limit cannot limit the axial shaking of the inner gear. Secondly, the contact area position of the side limit and the outer wall of the gear is limited, and strong friction will be generated between them to ensure the limiting, which will simultaneously lead to poor rotation effect of the parts and affect the accuracy of the sensor.

[0005] Therefore, we propose a limiting structure to improve the angle measurement accuracy of the torque angle sensor. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a limit structure for improving the angle measurement accuracy of a torque angle sensor, thereby solving the problem that the existing limit structure design accuracy does not meet the standards and affects the working accuracy of the sensor gear and the torque sensor thereon.

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a limit structure for improving the angle measurement accuracy of a torque angle sensor, comprising a gear cover and a sensor gear assembled inside the gear cover;

[0008] A limiting structure located between the gear cover and the sensor gear is fixedly installed on the inner side of the gear cover;

[0009] The limiting structure is composed of a waist-shaped circular ring on the top side and two groups of cantilever ribs on the bottom side thereof, the top surface of the waist-shaped circular ring is provided with an upper end surface, and the bottom of the sensor gear is provided with a lower circumferential surface in close contact with the upper end surface;

[0010] The cantilever rib is in a concave “><” shape, the top end of the cantilever rib is fixedly connected to the bottom of the waist-shaped circular ring, and the bottom end of the cantilever rib is fixedly connected to the bottom side surface of the inner side of the gear cover.

[0011] Preferably, the contact surfaces of the upper end surface and the lower circumferential surface are coated with grease;

[0012] Among them, grease is used for lubrication and heat absorption.

[0013] Preferably, the upper end surface height spacing D1 is 4.6±0.1 mm, and the axial space distance D2 of the sensor gear is set to 0.1 mm;

[0014] The setting of the upper end face height spacing D1 enables the end face and the pinion to have an axial interference fit, that is, a pre-compression fit design, and the purpose of the pre-compression design is to trigger the contact limit function of this structure.

[0015] Preferably, the gear cover material is PA6+GF30;

[0016] Among them, PA6+GF30 has excellent mechanical properties, mainly high strength, stiffness and wear resistance; heat resistance and physical properties, mainly impact resistance and dimensional stability; chemical stability, mainly corrosion resistance; because the material has the above characteristics as the basic premise, the limiting structure function of the gear cover can be stably exerted.

[0017] The utility model provides a limiting structure for improving the angle measurement accuracy of a torque angle sensor.

[0018] It has the following beneficial effects:

[0019] 1. The limiting structure for improving the angle measurement accuracy of the torque angle sensor can make the bottom of the limiting structure have a supporting function through the setting of the waist-shaped circular ring, so as to limit the axial shaking of the sensor gear. At the same time, the setting of the cantilever rib shape enables it to have a certain degree of elasticity that can be compressed and rebounded up and down, so that the elasticity can avoid the strong friction between the upper end face and the lower circumferential surface, and simultaneously avoid the situation that the rotation effect of the sensor gear and the limiting structure is poor, thereby solving the problem that the existing limiting structure design accuracy is not up to standard and affects the working accuracy of the sensor gear and the torque sensor thereon;

[0020] 2. The limit structure for improving the angle measurement accuracy of the torque angle sensor can improve the matching accuracy between the internal moving parts of the sensor by selecting the material of the gear cover parts and flexibly designing the limit structure, thereby improving the angle measurement accuracy and stability of the torque angle sensor, making this product more competitive than similar competing products on the market and helping to increase its market share in the automotive market. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the inner side of the gear cover of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the limiting structure of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the cantilever reinforcement of the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the sensor gear of the utility model.

[0026] In the figure: 1, gear cover; 2, sensor gear; 21, lower circumferential surface; 3, limiting structure; 31, waist-shaped ring; 311, upper end surface; 32, cantilever rib. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-5The embodiment of the utility model provides a technical solution: a limiting structure for improving the angle measurement accuracy of a torque angle sensor, comprising a gear cover 1 and a sensor gear 2 assembled on its inner side; a limiting structure 3 located between the gear cover 1 and the sensor gear 2 is fixedly installed on the inner side of the gear cover 1; the limiting structure 3 is composed of a waist-shaped circular ring 31 on the top side and two groups of cantilever ribs 32 on the bottom side thereof, the top surface of the waist-shaped circular ring 31 is provided with an upper end surface 311, and the bottom of the sensor gear 2 is provided with a lower circumferential surface 21 in close contact with the upper end surface 311; the cantilever rib 32 is in a concave “><” shape, the top end of the cantilever rib 32 is fixedly connected to the bottom of the waist-shaped circular ring 31, and the bottom end of the cantilever rib 32 is fixedly connected to the bottom side surface of the inner side of the gear cover 1;

[0029] Among them, the limiting structure for improving the angle measurement accuracy of the torque angle sensor can make the bottom of the limiting structure 3 have a supporting function through the setting of the waist-shaped ring 31, thereby limiting the axial shaking of the sensor gear 2. At the same time, the shape of the cantilever rib 32 is set to enable it to have a certain degree of elasticity that can be compressed and rebounded up and down, so that the elasticity can avoid strong friction between the upper end face 311 and the lower circumferential surface 21, and simultaneously avoid the situation that the rotation effect of the sensor gear 2 and the limiting structure 3 is poor, thereby solving the problem that the design accuracy of the existing limiting structure 3 does not meet the standard and affects the working accuracy of the sensor gear 2 and the torque sensor thereon.

[0030] Embodiment 2:

[0031] Grease is applied to the contact surface between the upper end surface 311 and the lower circumferential surface 21 ; the grease is used for lubrication and heat absorption.

[0032] The height spacing D1 of the upper end surface 311 is 4.6±0.1mm, and the axial spatial distance D2 of the sensor gear 2 is set to 0.1mm; wherein, the setting of the height spacing D1 of the upper end surface 311 enables the end surface and the pinion to have an axial interference fit, i.e., a pre-tightening fit design, and the purpose of the pre-tightening design is to trigger the contact limit function of this structure.

[0033] The material of the gear cover 1 is PA6+GF30; among them, PA6+GF30 has excellent mechanical properties, mainly high strength and stiffness and wear resistance; heat resistance and physical properties, mainly impact resistance and dimensional stability; chemical stability, mainly corrosion resistance; because the material has the above characteristics as the basic premise, the limiting structure function of the gear cover 1 can be stably exerted.

[0034] Among them, the limit structure for improving the angle measurement accuracy of the torque angle sensor can improve the matching accuracy between the internal moving parts of the sensor by selecting the material of the gear cover 1 and flexibly designing the limit structure 3, thereby improving the angle measurement accuracy and stability of the torque angle sensor, making this product more competitive than similar competing products on the market and helping to increase its market share in the automobile market.

[0035] The working principle and use process of the utility model are as follows: when the device is needed to work, the limiting structure 3 is fixedly installed on the inner side of the gear cover 1. During assembly, the lower circumferential surface 21 on the bottom side of the sensor gear 2 is tightly attached to the upper end surface 311 of the top of the waist-shaped ring 31 above the limiting structure 3, so as to limit the axial shaking of the sensor gear 2. At the same time, the shape of the cantilever rib 32 can make it have a certain degree of compression and rebound elasticity, thereby avoiding strong friction and ensuring the rotation effect and subsequent measurement accuracy.

[0036] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A limit structure for improving the angle measurement accuracy of a torque angle sensor, comprising a gear cover (1) and a sensor gear (2) mounted inside the gear cover; Features: A limiting structure (3) located between the gear cover (1) and the sensor gear (2) is fixedly installed on the inner side of the gear cover (1); The limiting structure (3) is composed of a waist-shaped circular ring (31) on the top side and two groups of cantilever ribs (32) on the bottom side thereof; the top surface of the waist-shaped circular ring (31) is provided with an upper end surface (311), and the bottom of the sensor gear (2) is provided with a lower circumferential surface (21) in close contact with the upper end surface (311); The cantilever rib (32) is in a concave "><" shape, the top end of the cantilever rib (32) is fixedly connected to the bottom of the waist-shaped circular ring (31), and the bottom end of the cantilever rib (32) is fixedly connected to the bottom side surface of the inner side of the gear cover (1).

2. A limit structure for improving the angle measurement accuracy of a torque angle sensor according to claim 1, characterized in that: Grease is applied on the contact surfaces of the upper end surface (311) and the lower circumferential surface (21).

3. A limit structure for improving the angle measurement accuracy of a torque angle sensor according to claim 1, characterized in that: The height spacing D1 of the upper end surface (311) is 4.6±0.1 mm, and the axial spatial distance D2 of the sensor gear (2) is set to 0.1 mm.

4. A limit structure for improving the angle measurement accuracy of a torque angle sensor according to claim 1, characterized in that: The gear cover (1) is made of PA6+GF30.

Images