Torque sensor rotating body

Abstract

The torque sensor rotating body comprises a rotating assembly and a magnet assembly, the rotating assembly comprises a gear ring piece and a first shaft fixing sleeve, the gear ring piece and the first shaft fixing sleeve are coaxially connected in an injection molding mode, the magnet assembly comprises a magnet ring and a second shaft fixing sleeve, and the magnet ring and the second shaft fixing sleeve are coaxially connected in an injection molding mode. The magnet ring is arranged on the inner side of the gear ring piece, the first shaft fixing sleeve and the second shaft fixing sleeve are each provided with a positioning notch, the two positioning notches are aligned in the axial direction, and the distribution position of magnetic poles of the magnet ring on the circumference is constant relative to the positioning notches of the second shaft fixing sleeve. According to the utility model, through the arrangement of the positioning notches, the magnetic pole and the gear ring can be conveniently positioned and can be automatically and accurately controlled at 48%-52% of a neutral position, and the consistency is kept.

Description

Technical Field

[0001] This utility model relates to the field of torque sensor technology, and in particular to a torque sensor rotating body. Background Technology

[0002] The rotating body of a torque sensor typically includes a rotating component and a magnet component. Strict requirements are placed on its mounting position on the input and output shafts of the tubing, the magnetic poles and orientation of the magnet component, and the position and orientation of the two toothed rings of the rotating component. How to quickly and effectively position the magnetic poles and toothed rings, as well as calibrate the center position of the rotating and magnet components, are all problems that need to be solved.

[0003] Rotating components typically include a plastic substrate, a shaft retaining ring, a first toothed ring, and a second toothed ring. The plastic substrate and the shaft retaining ring are first injection molded into a single structure to form a skeleton. Then, through a complex process, the first and second toothed rings are inserted into the skeleton. The toothed rings require assembly and fixing steps, resulting in low production efficiency. Moreover, the first and second toothed rings are usually trapezoidal, which places high demands on the axial position of the magnet ring during installation. Utility Model Content

[0004] This invention proposes a torque sensor rotating body, which facilitates the positioning of the magnetic poles and toothed ring by setting a positioning notch, and automatically and accurately controls the position to the middle position of 48% to 52% while maintaining consistency.

[0005] The technical solution of this utility model is implemented as follows: A torque sensor rotating body includes a rotating component and a magnet component. The rotating component includes a toothed ring and a first shaft fixing sleeve. The toothed ring and the first shaft fixing sleeve are coaxially injection molded together. The magnet component includes a magnet ring and a second shaft fixing sleeve. The magnet ring and the second shaft fixing sleeve are coaxially injection molded together. The magnet ring is placed inside the toothed ring. Both the first shaft fixing sleeve and the second shaft fixing sleeve are provided with positioning notches. The two positioning notches are aligned along the axial direction. The distribution position of the magnetic poles of the magnet ring on the circumference is constant relative to the positioning notches of the second shaft fixing sleeve.

[0006] Furthermore, the toothed ring component includes a first toothed ring and a second toothed ring arranged coaxially, and the teeth of both the first toothed ring and the second toothed ring are rectangular.

[0007] Furthermore, the magnet ring is located at the midpoint between the radial planes of the first toothed ring and the second toothed ring.

[0008] Furthermore, the first toothed ring, the second toothed ring, and the first shaft fixing sleeve are integrally injection molded together.

[0009] Furthermore, the magnet ring is an unmagnetized magnet ring before injection molding, and after injection molding, the magnet ring is magnetized by multi-pole magnetization and becomes a magnetized magnet ring. The magnetized magnet ring is placed inside the toothed ring part.

[0010] The beneficial effects of this utility model are:

[0011] This invention facilitates the positioning of the magnetic poles and orientation of the magnet assembly and the positions and orientations of the two toothed rings of the rotating assembly by setting a positioning notch. At the same time, the positioning notch enables the installation positions of the magnet ring assembly and the rotating body assembly on the input and output shafts to be automatically and accurately controlled at the center position (the center position is a duty cycle of 50%) of 48% to 52%, and to maintain consistency.

[0012] This utility model connects the toothed ring and the first shaft fixing sleeve coaxially in one injection molding process, eliminating the need to prepare the plastic substrate and skeleton first. This saves the assembly and fixing process on the skeleton when the toothed ring is a separate part, thus improving work efficiency. Moreover, the setting of the positioning notch makes it easy to ensure the accurate distribution sequence of the tooth gap between the two toothed rings, maintaining the "positive" position and improving the accuracy of the produced workpiece. In addition, the structure is robust, impact-resistant, and has strong vibration resistance.

[0013] Compared to trapezoidal teeth, the teeth of the first and second toothed rings of this invention are rectangular, which reduces the installation accuracy requirements of the magnet ring and helps to improve production efficiency. The magnetic field parameters remain stable even with slight axial displacement of the magnet ring. During the operation of the car steering system, considering factors such as mechanical wear, the magnetic field parameters can always remain in the initial state, resulting in a long service life without failure.

[0014] In existing technologies, a pre-magnetized magnet ring is often injection molded to connect with the second shaft fixing sleeve. In this invention, an unmagnetized magnet ring is first injection molded to connect with the second shaft fixing sleeve along the same axis. Then, the unmagnetized magnet ring is multi-pole magnetized. With the help of the positioning notch, it is easy to ensure that the distribution position of the magnetic poles of the magnet ring on the circumference is constant relative to the positioning notch of the second shaft fixing sleeve. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 for Figure 1 Sectional view of AA;

[0018] Figure 3 A schematic diagram of the rotating assembly after injection molding;

[0019] Figure 4 This is a schematic diagram of the structure of the rotating assembly before injection molding;

[0020] Figure 5 This is a schematic diagram of the structure of the magnet assembly after injection molding and connection.

[0021] Rotating component 1, magnet component 2, first shaft fixing sleeve 3, first toothed ring 4, second toothed ring 5, tooth 6, plastic substrate 7, magnet ring 8, second shaft fixing sleeve 9, positioning notch 10. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-4 As shown, a torque sensor rotator includes a rotating assembly 1 and a magnet assembly 2. The rotating assembly 1 includes a toothed ring and a first shaft fixing sleeve 3. The toothed ring includes a first toothed ring 4 and a second toothed ring 5 arranged coaxially. The first toothed ring 4, the second toothed ring 5 and the first shaft fixing sleeve 3 are all made of metal. There is no need to prepare a plastic substrate 7 and a skeleton in advance. The first toothed ring 4, the second toothed ring 5 and the first shaft fixing sleeve 3 are connected by injection molding in one step along the coaxial line to form an integral injection molding structure. That is, while the plastic substrate 7 is being injection molded, the first toothed ring 4, the second toothed ring 5 and the first shaft fixing sleeve 3 are connected together by injection molding.

[0024] The teeth 6 of the first toothed ring 4 and the second toothed ring 5 are both rectangular, and the magnet ring 8 is located at the midpoint of the radial plane of the first toothed ring 4 and the second toothed ring 5. Even if the axial position of the magnet ring 8 varies (≤2.5mm), the magnetic field distribution and intensity are maintained in the calibrated state, reducing the installation accuracy requirements for the axial position of the magnet ring 8.

[0025] like Figure 1 , 2 As shown in Figure 5, the magnet assembly 2 includes a magnet ring 8 and a second shaft fixing sleeve 9. The magnet ring 8 and the second shaft fixing sleeve 9 are coaxially injection molded together. Both the first shaft fixing sleeve 3 and the second shaft fixing sleeve 9 are provided with positioning notches 10. The two positioning notches 10 are aligned along the axial direction. The positioning notches 10 facilitate the centering calibration when the rotating assembly 1 and the magnet assembly 2 are assembled. Moreover, the positioning notches 10 of the first shaft fixing sleeve 3 can also help ensure the accurate distribution sequence of the tooth gaps of the first toothed ring 4 and the second toothed ring 5, so that they are kept in the "positive" position.

[0026] Before injection molding, the magnet ring 8 is an unmagnetized magnet ring. After injection molding, the magnet ring 8 undergoes multi-pole magnetization to become a magnetized magnet ring, which is placed inside the toothed ring part. After injection molding, the magnet ring 8 undergoes multi-pole magnetization again. The distribution of the magnetic poles of the magnet ring 8 on the circumference remains constant relative to the positioning notch 10 of the second shaft fixing sleeve 9, facilitating the positioning of the magnetic poles and orientation. Furthermore, during the centering and calibration process, positioning is performed using the positioning notch 10.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A torque sensor rotating body, comprising a rotating assembly and a magnet assembly, characterized in that: The rotating assembly includes a geared ring and a first shaft fixing sleeve, which are coaxially injection molded together. The magnet assembly includes a magnet ring and a second shaft fixing sleeve, which are coaxially injection molded together. The magnet ring is located inside the geared ring. Both the first shaft fixing sleeve and the second shaft fixing sleeve are provided with positioning notches, which are aligned axially. The distribution position of the magnetic poles of the magnet ring on the circumference is constant relative to the positioning notches of the second shaft fixing sleeve.

2. The torque sensor rotating body according to claim 1, characterized in that: The toothed ring component includes a first toothed ring and a second toothed ring arranged coaxially, and the teeth of both the first toothed ring and the second toothed ring are rectangular.

3. The torque sensor rotating body according to claim 1, characterized in that: The magnet ring is located at the midpoint of the radial plane of the first toothed ring and the second toothed ring.

4. A torque sensor rotating body according to claim 2 or 3, characterized in that: The first toothed ring, the second toothed ring, and the first shaft fixing sleeve are integrally injection molded together.

5. A torque sensor rotating body according to claim 1, characterized in that: Before injection molding, the magnet ring is an unmagnetized magnet ring. After injection molding, the magnet ring is magnetized by multi-pole magnetization and becomes a magnetized magnet ring. The magnetized magnet ring is placed on the inside of the toothed ring part.

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