Linear displacement sensor of shock absorber

Abstract

The utility model provides a shock absorber linear displacement sensor, which comprises a shell, a PCBA board and a detection target, the shell is fixed on a fixing piece of a shock absorber, the PCBA board is fixed in the shell, a coil is printed in the PCBA board, and the coil is arranged along the moving range of a moving piece of the shock absorber; the detection target is installed on a moving part of the shock absorber, and when the detection target moves along with the moving part, the state of a magnetic field generated by the coil is changed. The linear displacement sensor is directly installed on the shock absorber, the structure is simple, installation is convenient, indirect measurement through intermediate parts is not needed, and accumulated tolerance is reduced; and a coil in the PCBA board is combined with a detection target, and the displacement of the shock absorber is sensed by using an inductance type measurement technology, so that closed-loop control of the suspension system is realized, the measurement precision is high, and the measurement range is large.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive active suspension systems, and particularly to a shock absorber linear displacement sensor. Background Art

[0002] The automotive suspension system has the greatest impact on the ride comfort and driving safety of the vehicle. The automotive suspension system is also known as the automotive shock absorption system, and its main function is to support the vehicle body, buffer the vibration and impact transmitted from the road surface to the vehicle body, provide a stable and comfortable environment for the passengers and drivers, and ensure the driving safety of the vehicle. The progress of suspension technology has enabled the automotive suspension to develop from passive to semi-active, feedforward semi-active, and active.

[0003] In the existing automotive active suspension systems, most of the sensor products sense the height of the automotive suspension through multiple parts such as fixed brackets and multi-link mechanisms. There are many parts, and the mechanical cumulative tolerance is large, resulting in low accuracy. Moreover, due to the variety of parts in the suspension system, the types of fixed brackets are numerous.

[0004] In addition, in the automotive active suspension system and the steering system, it is necessary to measure a relatively long displacement of about 200 mm to 300 mm. However, the existing sensor products use the Hall principle, and the measurement range is small, not exceeding 200 mm. After the measurement range exceeds 200 mm, the accuracy is very low. Summary of the Utility Model

[0005] The utility model aims to provide a shock absorber linear displacement sensor to overcome the deficiencies in the prior art.

[0006] To solve the above technical problems, the technical solution of the utility model is: a shock absorber linear displacement sensor, including a housing, a PCBA board, and a detection target. The housing is fixed on the fixed part of the shock absorber. The PCBA board is fixed inside the housing, and a coil is printed inside the PCBA board. The coil is arranged along the moving range of the moving part of the shock absorber. The detection target is installed on the moving part of the shock absorber, and when the detection target moves with the moving part, it changes the magnetic field state generated by the coil. The PCBA board calculates the linear displacement of the shock absorber according to the changed magnetic field state.

[0007] Further, in the above shock absorber linear displacement sensor, terminals are also provided on the housing, and the PCBA board is communicatively connected to the outside through the terminals.

[0008] Further, in the above shock absorber linear displacement sensor, the housing includes a shell body and a shell cover. An installation groove for installing the PCBA board is provided at the upper end of the shell body, and a cavity for accommodating the detection target is provided at the lower end. The shell cover is arranged on the top of the shell body to close the opening of the installation groove.

[0009] Further, for the above shock absorber linear displacement sensor, the shell cover is fixedly connected to the shell by laser welding, ultrasonic welding or glue dotting process.

[0010] Further, for the above shock absorber linear displacement sensor, the detection target includes a detection seat and an induction sheet. The detection seat is installed on the moving part of the shock absorber, the induction sheet is arranged on the detection seat, facing the PCBA board, and the induction sheet is made of non-magnetic material.

[0011] Further, for the above shock absorber linear displacement sensor, the induction sheet and the detection seat are integrally formed by insert molding or fixedly connected by snap connection.

[0012] Further, for the above shock absorber linear displacement sensor, the moving part of the shock absorber is sleeved outside the fixing part, the shell of the outer shell is an arc-shaped body arranged along the outside of the moving part, the outer shell is connected to the fixing part of the shock absorber through an arc-shaped cover, the arc-shaped cover and the shell form a cylinder covering the outside of the moving part, and a clamping groove for clamping with the fixing part is arranged at the end of the formed cylinder.

[0013] Further, for the above shock absorber linear displacement sensor, the arc-shaped cover and the shell are clamped by a plurality of snap fasteners arranged on both sides of the arc-shaped cover.

[0014] Further, for the above shock absorber linear displacement sensor, a plurality of clamping parts are arranged at the bottom of the detection target, and a plurality of bosses for clamping with the clamping parts are arranged outside the moving part. Preferably, there are two clamping parts, one is a circular closed clamping part and the other is an open clamping part, which is convenient for installation while ensuring firm clamping.

[0015] Further, for the above shock absorber linear displacement sensor, the moving part of the shock absorber is arranged at the end of the fixing part, the outer shell is fixed outside the fixing part through a fastener, the detection seat of the detection target is installed at one end of the moving part close to the fixing part, and the end of the detection seat with the induction sheet is inserted into the outer shell and is slidably connected to the outer shell.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: The linear displacement sensor of the present utility model is directly installed on the shock absorber, with a simple structure and convenient installation. It does not need to indirectly measure through intermediate parts, reducing the cumulative tolerance; and through the combination of the coil in the PCBA board and the detection target, the inductive measurement technology is used to sense the displacement of the shock absorber, enabling the suspension system to achieve closed-loop control, with high measurement accuracy, large measurement range, and accurate detection can be achieved for measurement ranges > 100mm; in addition, the coil is directly printed on the PCBA board, with a small size, saving installation space, simple manufacturing, and reduced cost. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Structural schematic diagram of the first embodiment of the shock absorber linear displacement sensor of the present invention;

[0019] Figure 2 Partial structural schematic diagram of the first embodiment of the shock absorber linear displacement sensor of the present invention;

[0020] Figure 3 Top view of the first embodiment of the shock absorber linear displacement sensor of the present invention;

[0021] Figure 4 For Figure 3 A-sectional schematic diagram of;

[0022] Figure 5 For Figure 3 B-sectional schematic diagram of;

[0023] Figure 6 Detection target schematic diagram of the first embodiment of the shock absorber linear displacement sensor of the present invention;

[0024] Figure 7 Structural schematic diagram of the second embodiment of the shock absorber linear displacement sensor of the present invention;

[0025] Figure 8 Partial structural schematic diagram of the second embodiment of the shock absorber linear displacement sensor of the present invention;

[0026] Figure 9 Top view of the second embodiment of the shock absorber linear displacement sensor of the present invention;

[0027] Figure 10 For Figure 9 C-sectional schematic diagram of;

[0028] In the figure: 101, fixing member; 102, moving member;

[0029] 1, outer shell; 11, housing; 111, mounting groove; 112, cavity; 12, shell cover;

[0030] 2, PCBA board;

[0031] 3, detection target; 31, detection seat; 32, induction sheet; 33, clamping portion;

[0032] 4. Terminal

[0033] 5. Arc-shaped cover; 51. Card slot; 6. Buckle Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0035] Embodiment 1

[0036] As Figures 1-6 shown, a shock absorber linear displacement sensor includes a housing 1, a PCBA board 2, and a detection target 3. The housing 1 is fixed on a fixing member 101 of the shock absorber. The PCBA board 2 is fixed inside the housing 1, and a coil is printed inside the PCBA board 2, which is a carrier of the coil. The coil is arranged along the moving range of a moving member 102 of the shock absorber, so that the detection target 3 can sense the displacement of the shock absorber within the moving stroke range of the moving member 102. The detection target 3 is installed on the moving member 102 of the shock absorber. When the detection target 3 moves together with the moving member 102, it changes the magnetic field state generated by the coil. The PCBA board calculates the linear displacement of the shock absorber according to the changed magnetic field state. The linear displacement sensor of the present utility model is directly installed on the shock absorber, with a simple and compact structure, without indirect measurement through intermediate parts, reducing the cumulative tolerance. By combining the coil inside the PCBA board 2 with the detection target 3 and using inductive measurement technology to sense the displacement of the shock absorber, the suspension system can achieve closed-loop control, with high measurement accuracy, a large measurement range, and accurate detection for measurement ranges > 100 mm. In addition, the coil is directly printed on the PCBA board, with a small size, saving installation space, simple manufacturing, and reduced costs.

[0037] As Figure 1 shown, a terminal 4 is further provided on the housing 1. The PCBA board 2 is also a carrier of electronic components, connecting components such as capacitors, resistors, and chips through internal circuits, and communicating with the outside through the terminal 4.

[0038] As Figures 1-5 shown, the housing 1 includes a housing body 11 and a housing cover 12. An installation groove 111 for installing the PCBA board 2 is provided at the upper end of the housing body 1, and a cavity 112 for accommodating the detection target 3 is provided at the lower end. The housing cover 12 is provided on the top of the housing body 1 to close the opening of the installation groove 111.

[0039] Among them, the shell cover 12 is fixedly connected to the shell 11 by laser welding, ultrasonic welding or dispensing process. After the PCBA board 2 is installed in the shell 11, the shell cover 12 is fixedly installed on the shell 11 to completely close the opening of the installation groove 111, ensuring the protection of the PCBA board.

[0040] As Figures 4-6 shown, the detection target 3 includes a detection base 31 and an induction sheet 32. The detection base 31 is installed on the moving part 102 of the shock absorber, and the induction sheet 32 is arranged on the detection base 31 and faces the PCBA board. Among them, the induction sheet 32 is made of non-magnetic materials, such as copper or copper alloy, aluminum or aluminum alloy, stainless steel, etc.; the induction sheet 32 and the detection base 31 are integrally formed by insert molding, with simple manufacturing process and low cost, and can also be fixedly connected by snap connection.

[0041] As Figures 1-5 shown, a structure of a shock absorber, the moving part 102 of the shock absorber is sleeved outside the fixed part 101. For example, the fixed part 101 can be a shock absorber cylinder block, and the moving part 102 can be a shock absorber piston rod; the shell 11 of the outer shell 1 is an arc-shaped body arranged along the outside of the shock absorber piston rod. The outer shell 1 is connected to the shock absorber cylinder block through an arc-shaped cover 5. The arc-shaped cover 5 and the shell 11 form a cylinder covering the outside of the shock absorber piston rod, and a clamping groove 51 for clamping with the shock absorber cylinder block is provided at the end of the formed cylinder. The outer shell 1 is fixed on the fixed part 101 of the shock absorber through the arc-shaped cover 5, with a simple structure and convenient installation. Moreover, the shell 11, the shell cover 12, and the arc-shaped cover 5 are all plastic parts, which are manufactured by injection molding, with simple manufacturing and low cost.

[0042] In the above structure, as Figures 1-2 shown in Figures 4 and 5, the arc-shaped cover 5 and the shell 11 are snap-connected through a plurality of snaps 6 arranged on both sides of the arc-shaped cover 5, with convenient installation. It should be noted that the assembly of the arc-shaped cover 5 and the shell 11 is not limited to this, and they can also be directly integrally formed.

[0043] As Figures 4-6 shown, a plurality of clamping parts 33 are provided at the bottom of the detection target 3, and a plurality of bosses for clamping with the clamping parts 33 are provided outside the shock absorber piston rod. In this embodiment, there are two clamping parts 33, one is a circular closed clamping part, and the other is an open clamping part, which is convenient for installation on the basis of ensuring firm clamping.

[0044] Embodiment 2

[0045] As Figures 7-10As shown in the figure, a linear displacement sensor for a shock absorber includes a housing 1, a PCBA board 2, and a detection target 3. The housing 1 is fixed on the fixing part 101 of the shock absorber. The PCBA board 2 is fixed inside the housing 1, and a coil is printed inside the PCBA board 2, which is the carrier of the coil. The coil is arranged along the moving range of the moving part 102 of the shock absorber, so that the detection target 3 can sense the displacement of the shock absorber within the moving stroke range of the moving part 102. The detection target 3 is installed on the moving part 102 of the shock absorber. When the detection target 3 moves with the moving part 102, it changes the magnetic field state generated by the coil, and the PCBA board calculates the linear displacement of the shock absorber according to the changed magnetic field state. The linear displacement sensor of the present utility model is directly installed on the shock absorber, with a simple and compact structure. It does not need to indirectly measure through intermediate parts, reducing the cumulative tolerance. By combining the coil inside the PCBA board 2 with the detection target 3 and using inductive measurement technology to sense the displacement of the shock absorber, the suspension system can achieve closed-loop control, with high measurement accuracy, a large measurement range, and can accurately detect when the measurement range > 100mm. In addition, the coil is directly printed on the PCBA board, with a small size, saving installation space, simple manufacturing, and reducing costs.

[0046] As Figures 7-8 shown, a terminal 4 is further provided on the housing 1. The PCBA board 2 is also the carrier of electronic components, connecting components such as capacitors, resistors, and chips through internal circuits, and communicating with the outside through the terminal 4.

[0047] As Figure 7 、 10 shown, the housing 1 includes a housing body 11 and a housing cover 12. An installation groove 111 for installing the PCBA board 2 is provided at the upper end of the housing body 1, and a cavity 112 for accommodating the detection target 3 is provided at the lower end. The housing cover 12 is arranged on the top of the housing body 1 to close the opening of the installation groove 111.

[0048] Among them, the housing cover 12 is fixedly connected to the housing body 1 by laser welding, ultrasonic welding, or dispensing process. After the PCBA board 2 is installed into the housing body 1, the housing cover 12 is fixedly installed on the housing body 1 to completely close the opening of the installation groove 111, ensuring the protection of the PCBA board.

[0049] As Figure 10 shown, the detection target 3 includes a detection seat 31 and an induction sheet 32. The detection seat 31 is installed on the moving part 102 of the shock absorber, and the induction sheet 32 is arranged on the detection seat 31 and faces the PCBA board. Among them, the induction sheet 32 is made of non-magnetic materials, such as copper or copper alloy, aluminum or aluminum alloy, stainless steel, etc.; the induction sheet 32 and the detection seat 31 are integrally formed by insert molding, with a simple manufacturing process and low cost.

[0050] As Figures 7-10As shown, a structure of a shock absorber. The moving part 102 of the shock absorber is arranged at the end of the fixed part 101. For example, the fixed part 101 is the shock absorber motor housing, and the moving part 102 is the spring seat. The outer shell 1 is fixed outside the shock absorber motor housing through fasteners. The detection seat 31 of the detection target 3 is installed at one end of the spring seat close to the shock absorber motor housing, and the end of the detection seat 31 where the induction piece 32 is installed is inserted into the inner part of the outer shell 1 and is slidably connected to the outer shell 1.

[0051] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0052] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A shock absorber linear displacement sensor, characterized in that: The invention comprises a shell, a PCBA board, and a detection target. The shell is fixed on a fixing part of a shock absorber, the PCBA board is fixed in the shell, a coil is printed inside the PCBA board, and the coil is arranged along the moving range of a moving part of the shock absorber. The detection target is installed on the moving part of the shock absorber, and the magnetic field state generated by the coil is changed when the detection target moves with the moving part.

2. The shock absorber linear displacement sensor according to claim 1, characterized in that: The shell is also provided with terminals, and the PCBA board is connected to the outside through the terminals.

3. The shock absorber linear displacement sensor according to claim 1, characterized in that: The shell includes a shell body and a shell cover. The upper end of the shell body is provided with a mounting groove for mounting a PCBA board, and the lower end is provided with a cavity for accommodating a detection target. The shell cover is arranged on the top of the shell body and is used to close the opening of the mounting groove.

4. The shock absorber linear displacement sensor according to claim 3, characterized in that: The shell cover is fixedly connected to the shell body by laser welding, ultrasonic welding or glue dispensing technology.

5. The shock absorber linear displacement sensor according to claim 1, characterized in that: The detection target includes a detection seat and a sensor sheet. The detection seat is installed on a moving part of the shock absorber. The sensor sheet is arranged on the detection seat and is arranged toward the PCBA board. The sensor sheet is made of non-magnetic material.

6. The shock absorber linear displacement sensor according to claim 5, characterized in that: The sensing sheet and the detection seat are integrally formed by insert injection molding, or fixedly connected by a snap connection.

7. The shock absorber linear displacement sensor according to any one of claims 1 to 6, characterized in that: The movable part of the shock absorber is sleeved on the outside of the fixed part, the shell of the outer shell is an arc-shaped body arranged along the outer side of the movable part, the outer shell is connected to the fixed part of the shock absorber through an arc-shaped cover, the arc-shaped cover and the shell form a cylinder covering the outer side of the movable part, and the end of the cylinder is provided with a slot that is engaged with the fixed part.

8. The shock absorber linear displacement sensor according to claim 7, characterized in that: The arc-shaped cover and the shell are connected by a plurality of buckles arranged on both sides of the arc-shaped cover.

9. The shock absorber linear displacement sensor according to claim 7, characterized in that: A plurality of clamping parts are arranged at the bottom of the detection target, and a plurality of bosses clamped with the clamping parts are arranged outside the moving part.

10. The shock absorber linear displacement sensor according to any one of claims 1 to 6, characterized in that: The movable part of the shock absorber is arranged at the end of the fixed part, the shell is fixed to the outside of the fixed part by a fastener, the detection seat for detecting the target is installed on the movable part at one end close to the fixed part, and the end of the detection seat equipped with the induction sheet is inserted into the shell and slidably connected to the shell.

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