Small-size PCB wide-range linear displacement sensor

Abstract

The utility model discloses a small-size printed circuit board (PCB) wide-range linear displacement sensor, which relates to the technical field of linear displacement sensors, comprises a fixing part, a fixing part matching part and a PCB, and is characterized in that the PCB comprises at least one group of exciting coils and induction coils, the excitation coil is arranged on the outer side of the induction coil in a surrounding manner; a transverse shaft is arranged on one side of the fixing part matching part, the fixing part matching part is independently fixed on the periphery of the transverse shaft, the fixing part is arranged on the fixing part matching part, the fixing part is provided with induction belts in the measured displacement direction, the number of the induction belts is consistent with that of the induction coils, and the positions of the induction belts correspond to those of the induction coils. According to the utility model, the structure is simple, the cost is low, the space size of the PCB is small, the PCB is used as a moving part, the movement is more stable, the parallelism of the PCB and a fixed part is easier to ensure, the test distance can be increased under the condition that the length of the PCB is limited, and the test precision is higher.

Description

TECHNICAL FIELD

[0001] The utility model belongs to linear displacement sensor technical direction, specifically relates to a small size PCB large range linear displacement sensor. BACKGROUND

[0002] The function of linear displacement sensor is to convert linear mechanical displacement into electrical signal. In some automotive applications, such as steering system, the relative long displacement of about 20 to 30 cm is also measured, but most of the existing sensors that meet the measurement range usually have large size, and the measurement accuracy will be reduced due to the increase of size, and the measurement range of high-precision sensor cannot meet the use requirement.

[0003] Therefore, it is necessary to provide a small size PCB large range linear displacement sensor, which can increase the measurement distance under the condition of limited circuit board length. UTILITY MODEL CONTENT

[0004] The utility model discloses a small size PCB large range linear displacement sensor for the prior device, to solve the problem in the background art.

[0005] In order to solve the above technical problem, the utility model provides the following technical scheme: a small size PCB large range linear displacement sensor, including fixed component, fixed component pair spare, PCB board and sensor shell, at least one group of exciting coil and inductive coil are included on the PCB board, the exciting coil is arranged outside the inductive coil, the length of the PCB board can be set relatively small, so that the cost is also relatively low.

[0006] The fixed component pair spare is provided with a horizontal shaft, the fixed component pair spare is fixed to the periphery of the horizontal shaft, the fixed component is arranged on the fixed component pair spare, the fixed component is provided with an inductive band in the measured displacement direction, the inductive band is consistent with the number of the inductive coil, and the positions are respectively corresponding, at least one conductive coupling section is arranged on the inductive band, and the corresponding non-coupling section is arranged to separate the coupling sections from each other, the non-coupling section is less conductive or non-conductive relative to the coupling section, by increasing the number of the coupling section and the non-coupling section, and relying on vernier algorithm, the absolute range of test displacement can be increased.

[0007] The utility model further illustrates that the both ends of the horizontal shaft are connected with steering wheels.

[0008] The utility model further illustrates, the fixed component has the slide rail to the inside setting of accessory, the cross axle is fixedly connected with the connecting structure, the PCB board bottom is connected with the bearing part, the bearing part is connected with the connecting structure, the bearing part slides in the slide rail, the PCB board needs to be sealed, the sealed PCB board can pass through the bearing part and the connecting structure and the cross axle jointly as the moving part, reduce the space size, be favorable to obtain more stable movement, more easily guarantee its parallelism with the fixed component, obtain higher test precision.

[0009] The utility model further illustrates, the fixed component is processed into a single part, and is installed and fixed on the fixed component pair accessory.

[0010] The utility model further illustrates, the wire harness is connected on the PCB board, and the wire harness leads out through the fixed component pair accessory.

[0011] The utility model further illustrates, the excitation coil and the induction coil on the PCB board are provided with two groups, the excitation coil is respectively first excitation coil and second excitation coil, and the induction coil is respectively first induction coil and second induction coil.

[0012] The utility model further illustrates, two groups of induction coils are arranged side by side on the same plane, and the induction band of the fixed component corresponding to the coupling section and the non-coupling section is arranged side by side.

[0013] Compared with the prior art, the utility model has the beneficial effects that: the utility model has simple product structure, low cost, under the condition of the length limitation of the circuit board, the circuit board and the moving element are used as moving parts, and the movement is more stable, the parallelism of the PCB board and the fixed component (coupling section and non-coupling section) is more easily guaranteed, and more coupling sections and non-coupling sections are arranged in the measured displacement direction, so that the test distance is increased under the condition of the length limitation of the circuit board, and the test precision is higher. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings are used to provide further understanding of the utility model, and constitute a part of the specification, are used to explain the utility model together with the embodiments of the utility model, and do not constitute the limitation to the utility model. In the drawings, the utility model is shown in the drawings as follows:

[0015] Fig. 1 It is the overall structure schematic diagram of the utility model;

[0016] Fig. 2 It is the partial structure schematic diagram of the utility model;

[0017] Fig. 3 It is the internal structure schematic diagram of the utility model;

[0018] In the figure: 1, fixed component pair accessory; 2, cross shaft; 3, PCB board; 41, first excitation coil; 42, second excitation coil; 51, first induction coil; 52, second induction coil; 6, fixed component; 7, coupling section; 8, non-coupling section; 9, induction band; 10, connecting structure; 11, bearing component; 12, slide rail; 13, wire harness. DETAILED DESCRIPTION

[0019] The technical scheme of the utility model will be further described in detail below in combination with preferred embodiments and drawings thereof. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] Please refer to Figs. 1-3 The utility model provides technical scheme: a small size PCB large range linear displacement sensor, including fixed component 6, fixed component pair accessory 1, PCB board 3, this sensor provides lateral linear displacement signal for steering system, and the steering system includes cross shaft 2, and the both ends of cross shaft 2 are connected with steering wheel.

[0021] PCB board 3 includes at least one group of excitation coil and induction coil, as Fig. 3 Shown, excitation coil and induction coil are provided with two groups, and excitation coil is first excitation coil 41 and second excitation coil 42 respectively, and induction coil is first induction coil 51 and second induction coil 52 respectively, and two groups of induction coils are arranged side by side on the same plane, and two groups of excitation coils are arranged around the outside of two groups of induction coils.

[0022] Two groups of induction coils correspond to different lengths, and the number of induced electromotive force signal periods generated along the measured displacement direction corresponds to different, which can further improve the test accuracy in combination with the rear-end algorithm.

[0023] Fixed component pair accessory 1 is arranged on one side of cross shaft 2, and fixed component pair accessory 1 is independently fixed on the periphery of cross shaft 2, fixed component 6 is arranged on fixed component pair accessory 1, fixed component pair accessory 1 is internally provided with slide rail 12, connecting structure 10 is fixedly connected on cross shaft 2, bearing component 11 is connected at the bottom of PCB board 3, bearing component 11 is connected with connecting structure 10, bearing component 11 slides in slide rail 12, and PCB board 3 needs to be sealed.

[0024] PCB board 3 is connected with wire harness 13, and wire harness 13 is led out through fixed component pair accessory 1.

[0025] The fixed component 6 is provided with an induction band 9 in the measured displacement direction, the induction band 9 is consistent with the number of induction coils, and the positions are correspondingly matched, at least one conductive coupling segment 7 is arranged on the induction band 9, and the corresponding non-coupling segment 8 separates the coupling segments 7 from each other, the induction band 9 of the fixed component 6 corresponding to the induction coil is arranged in parallel, the non-coupling segment 8 is less conductive or non-conductive relative to the coupling segment 7, the absolute range of the test displacement can be increased by increasing the number of the coupling segment 7 and the non-coupling segment 8 and then relying on the vernier algorithm.

[0026] It should be noted that the fixed component 6 can be processed into a single part and mounted on the fixed component pair fitting 1, or be an assembly with the fixed component pair fitting 1, facilitating processing and installation.

[0027] Working principle: the PCB board 3 printed with the excitation coil and the induction coil is fixed on the sensor shell connected with the horizontal shaft 2 to form a moving component whole, and the fixed component 6 is provided with an induction band 9, at least one conductive induction coupling segment 7 and the non-coupling segment 8 less conductive or non-conductive relative to the coupling segment 7 are arranged on the induction band 9, the non-coupling segment 8 separates the coupling segments 7 from each other in the transverse extension direction of the induction band 9, in the moving process of the moving component, the excitation coil moves relative to the fixed component 6, the excitation or eddy current is generated in the coupling segment 7, and the excitation or eddy current is detected by the corresponding induction coil, thereby, the linear displacement of the moving component moving in the moving direction or the linear position of the moving component relative to the fixed component 6 can be measured according to the vernier algorithm by using the induction band 9 with the coupling segments 7 staggered and different in number, and the absolute range of the test displacement is increased.

[0028] In the description of the utility model, it should be understood that the directions or position relations indicated by the terms "upper", "lower", "front", "rear", "left", "right" and the like are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0029] Finally, it should be pointed out that: the above examples are only used to illustrate the technical scheme of the utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing examples, or make equivalent replacement to part of the technical features, and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of the utility model embodiments.

Claims

1. A small size PCB large range linear displacement sensor, comprising a fixed part (6), a fixed part-to-fitting (1) and a PCB board (3), characterized in that: The PCB (3) comprises at least one set of excitation coils and induction coils, the excitation coils are arranged outside the induction coils; The fixed component pair accessory (1) has a horizontal shaft (2) on one side, the fixed component pair accessory (1) is independently fixed on the periphery of the horizontal shaft (2), the fixed component (6) is arranged on the fixed component pair accessory (1), the fixed component (6) is provided with an induction band (9) in the direction of the measured displacement, the number of the induction band (9) is consistent with the number of the induction coils, and the positions are correspondingly matched, the induction band (9) is arranged with at least one coupling section (7), and the corresponding non-coupling section (8) is arranged to separate the coupling section (7).

2. The small size PCB large range linear displacement sensor according to claim 1, characterized in that: The horizontal shaft (2) is connected with steering wheels at both ends.

3. The small size PCB large range linear displacement sensor according to claim 1, characterized in that: The fixed component pair accessory (1) is provided with a sliding rail (12) inside, the horizontal shaft (2) is fixedly connected with a connecting structure (10), the PCB (3) is connected with a bearing component (11) at the bottom, the bearing component (11) is connected with the connecting structure (10), and the bearing component (11) slides in the sliding rail (12).

4. The small size PCB large range linear displacement sensor according to claim 1, characterized in that: The fixed component (6) is processed into a separate part and is fixedly installed on the fixed component pair accessory (1).

5. The small size PCB large range linear displacement sensor according to claim 1, characterized in that: The PCB (3) is connected with a wire harness (13), the wire harness (13) penetrates through the fixed component pair accessory (1) and is led out.

6. The small size PCB large range linear displacement sensor according to claim 1, characterized in that: The excitation coils and the induction coils on the PCB (3) are provided with two groups, the excitation coils are respectively a first excitation coil (41) and a second excitation coil (42), and the two groups of induction coils are respectively a first induction coil (51) and a second induction coil (52).

7. The small size PCB large range linear displacement sensor according to claim 6, characterized in that: The two groups of induction coils are arranged side by side on the same plane, the induction band (9) of the fixed component (6) arranged with the coupling section (7) and the non-coupling section (8) is arranged side by side.

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