Displacement detection device, linear electric motor, electromagnetic shock absorber, and vehicle

Abstract

A displacement detection device, comprising: a first component (1), a second component (2) and a position detection element (3). The first component (1) is movable relative to the second component (2), a holding element (50) is provided between the first component (1) and the second component (2), and the position detection element (3) at least partially overlaps with the holding element (50) in terms of height. Further disclosed is a vehicle, comprising a displacement detection device, a linear electric motor, and an electromagnetic shock absorber.

Description

Displacement detection device, linear motor, electromagnetic shock absorber and vehicle

[0001] This application claims priority to the Chinese patent disclosure with application number 2023118693992 filed with the Patent Office of China on December 29, 2023, and with the disclosure name “Displacement detection device, linear motor, electromagnetic shock absorber and vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to, but is not limited to, the field of vehicle technology, and specifically to a displacement detection device, a linear motor, an electromagnetic shock absorber, and a vehicle. Background Art

[0003] With the advancement of technology, vehicle comfort is gaining increasing attention. Electromagnetic shock absorbers typically include linear motors, which are used to reduce vibration and noise. The displacement detection device within the linear motor plays a crucial role.

[0004] In the related art, a displacement detection device usually uses a grating guide rail and a grating scanning head. The grating guide rail and the grating scanning head are arranged relative to each other, and the two move relative to each other to perform displacement detection. Summary of the Invention

[0005] In view of the above problems, the present application is proposed to provide a displacement detection device, a linear motor, an electromagnetic shock absorber, and a vehicle that overcome or at least partially solve the above problems. The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of the claims.

[0006] In a first aspect, an embodiment of the present application provides a displacement detection device, comprising:

[0007] first component;

[0008] a second component, the first component being movable relative to the second component;

[0009] a retaining member disposed between the first component and the second component;

[0010] A position detecting member is provided, wherein the position detecting member and the retaining member at least partially overlap in height.

[0011] In some embodiments of the present application, the position detection element includes a magnetic element and a magnetic field sensing element;

[0012] One of the magnetic component and the magnetic field induction component is connected to the first component, and the other of the magnetic component and the magnetic field induction component is connected to the second component, and the magnetic component and the magnetic field induction component are arranged opposite to each other;

[0013] At least one of the magnetic component and the magnetic field induction component is at least partially highly overlapped with the retaining component.

[0014] In some embodiments of the present application, a first opening is provided on the retaining member, so that the magnetic field induction member and the magnetic member are disposed adjacent to each other at the first opening.

[0015] In some embodiments of the present application, one of the first component and the second component is connected to the retaining member, and the other of the first component and the second component moves along the retaining member.

[0016] In some embodiments of the present application, the magnetic field induction component is arc-shaped, and the magnetic field induction component and the magnetic component are coaxially arranged.

[0017] In some embodiments of the present application, the magnetic component is a ferromagnetic component or an electromagnetic component, and the magnetic field sensing component is a sensing chip.

[0018] In some embodiments of the present application, the retaining member includes a bearing.

[0019] In a second aspect, an embodiment of the present application provides a linear motor, comprising a stator assembly, a mover assembly and the displacement detection device, wherein the stator assembly comprises the first component and a first magnet disposed on the first component, and the mover assembly comprises the second component and a second magnet disposed on the second component.

[0020] In some embodiments of the present application, the first component is configured as a shell, a receiving cavity is formed in the shell, and the first magnet is disposed on the shell;

[0021] The second component is configured as a push rod, the second magnet is disposed on the push rod, at least a portion of the push rod is located in the accommodating cavity, and the push rod moves axially relative to the housing.

[0022] In some embodiments of the present application, the position detection element includes a magnetic element and a magnetic field sensing element;

[0023] A port is provided at one end of the shell, the push rod is accommodated in the port, the magnetic field induction component is connected to the port, the magnetic component is provided on the push rod, and the magnetic field induction component and the retaining component at least partially overlap in height.

[0024] In some embodiments of the present application, a first opening is provided on the retaining member, so that the magnetic field induction member and the magnetic member are disposed adjacent to each other at the first opening;

[0025] The port is provided with a second opening, the second opening is arranged opposite to the first opening, and the magnetic field induction component is connected to the second opening.

[0026] In some embodiments of the present application, the position detection component includes a magnetic component and a magnetic field sensing component, and the magnetic field sensing component is connected to the retaining component.

[0027] In some embodiments of the present application, the magnetic member is connected to the outer wall of the push rod and extends along the axial direction of the push rod, and the magnetic member extends in the circumferential direction of the push rod.

[0028] In some embodiments of the present application, the first magnet is connected to the inner wall of the shell, the second magnet is connected to the outer wall of the push rod and is located in the accommodating cavity, the first magnet is a permanent magnet or an electromagnet, and the second magnet is a coil.

[0029] In some embodiments of the present application, the housing and the push rod are both made of non-magnetic materials.

[0030] In some embodiments of the present application, the non-magnetic conductive material is aluminum alloy.

[0031] In some embodiments of the present application, the distance between the magnetic member and the first magnet along the axial direction of the push rod is greater than or equal to 20 mm.

[0032] In some embodiments of the present application, the minimum distance between the magnetic field induction component and the second magnet along the axial direction of the push rod is greater than or equal to 40 mm.

[0033] In a third aspect, an embodiment of the present application proposes an electromagnetic shock absorber, which includes the linear motor.

[0034] In a fourth aspect, an embodiment of the present application proposes a vehicle, which includes the electromagnetic shock absorber.

[0035] The beneficial effects of the embodiment of the present application are as follows: In the embodiment of the present application, the displacement detection device includes: a first component; a second component, the first component is movable relative to the second component; a retaining member, the retaining member is arranged between the first component and the second component; a position detecting member, the position detecting member and the retaining member at least partially overlap in height. In this way, by arranging the retaining member between the first component and the second component and arranging the position detecting member and the retaining member to overlap at least partially in height, when the first component and the second component perform relative movement, since the position detecting member and the retaining member at least partially overlap in height, the position detecting member and the retaining member can have a larger overlapping surface in the height direction, thereby making the two have a better alignment effect, and thus having a higher detection accuracy for the displacement generated by the relative movement between the first component and the second component. This avoids the problem of easy offset caused by the relative movement between the two when using a grating guide and a grating scanning head for displacement detection, avoids the problem of inaccurate displacement detection, and improves the accuracy of displacement detection.

[0036] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] FIG1 is a schematic structural diagram of a linear motor provided in an exemplary embodiment of the present application;

[0039] FIG2 is a cross-sectional view of a linear motor provided in an exemplary embodiment of the present application;

[0040] FIG3 is a schematic diagram of the linear relationship between the magnetic field strength of a magnetic component of a linear motor and the stroke of a push rod provided in an exemplary embodiment of the present application;

[0041] FIG4 is a schematic diagram of the linear relationship between the electrical signal of the magnetic field induction element of a linear motor and the stroke of the push rod provided in an exemplary embodiment of the present application;

[0042] FIG5 is a schematic diagram showing the structure of a magnetic component and a magnetic field induction component of a linear motor provided in an exemplary embodiment of the present application;

[0043] FIG6 is a second structural schematic diagram of a magnetic component and a magnetic field induction component of a linear motor provided in an exemplary embodiment of the present application;

[0044] FIG7 is one of the partial magnetic field distribution diagrams of a linear motor provided in an exemplary embodiment of the present application;

[0045] FIG8 is a second schematic diagram of a partial magnetic field distribution of a linear motor provided in an exemplary embodiment of the present application.

[0046] Figure markings: 1-first component; 2-second component; 3-position detection component; 10-housing; 20-push rod; 30-magnetic component; 40-magnetic field sensing component; 11-port; 50-holding component; 51-first opening; 13-second opening; 60-first magnet; 70-second magnet; 14-contact area. DETAILED DESCRIPTION

[0047] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] In the description of this application, 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 can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0051] In the related art, the displacement detection device has high requirements for alignment, and the relative movement between the grating guide rail and the grating scanning head is prone to offset, which can easily cause inaccurate displacement detection.

[0052] To address the above-mentioned issues, embodiments of the present application provide a linear motor and a displacement detection device therein. Referring to Figures 1 to 8 , schematic diagrams of the structure of a linear motor and a displacement detection device therein provided in embodiments of the present application are shown. The displacement detection device may specifically include a first component 1, a second component 2, a retaining member 50, and a position detection member 3. The first component 1 is movable relative to the second component 2. The retaining member 50 is disposed between the first component 1 and the second component 2. The position detection member 3 and the retaining member 50 at least partially overlap in height.

[0053] In the embodiment of the present application, by arranging the retaining member 50 between the first component 1 and the second component 2, and arranging the position detecting member 3 to overlap at least partially with the retaining member 50 in height, when relative motion occurs between the first component 1 and the second component 2, since the position detecting member 3 and the retaining member 50 at least partially overlap in height, the position detecting member 3 and the retaining member 50 can have a larger overlapping surface in the height direction, thereby achieving a better alignment effect between the two, and thus having a higher detection accuracy for the displacement generated by the relative motion between the first component 1 and the second component 2. This avoids the problem of easy offset caused by the relative motion between the two when using a grating guide and a grating scanning head for displacement detection, avoids the problem of inaccurate displacement detection, and improves the accuracy of displacement detection.

[0054] Specifically, in the embodiment of the present application, the position detecting member 3 and the retaining member 50 at least partially overlap in height, meaning that in the height direction, that is, in the vertical direction, the position detecting member 3 and the retaining member 50 at least partially overlap, and in the vertical direction, part of the retaining member 50 and part of the position detecting member 3 are located at the same height. This allows for a high degree of alignment between the position detecting member 3 and the retaining member 50, thereby enabling the position detector to more accurately detect the displacement change between the first component 1 and the second component 2.

[0055] It can be understood that the height direction in the embodiment of the present application is parallel to the direction of relative movement of the first component 1 and the second component 2, and at least partial height overlap means that in the direction of relative movement of the first component 1 and the second component 2, the position detection component 3 and the retaining component 50 at least partially overlap.

[0056] The height direction in the embodiment of the present application can also be understood as being arranged parallel to the axial direction of the first component and the second component, and at least partial height overlap means that in the axial direction of the first component 1 and the second component 2, the position detection component 3 and the retaining component 50 at least partially overlap.

[0057] In the embodiment of the present application, the position detection component 3 includes a magnetic component 30 and a magnetic field sensing component 40; one of the magnetic component 30 and the magnetic field sensing component 40 is connected to the first component 2, and the other of the magnetic component 30 and the magnetic field sensing component 40 is connected to the second component 3, and the magnetic component 30 and the magnetic field sensing component 40 are arranged opposite each other; at least one of the magnetic component 30 and the magnetic field sensing component 40 is at least partially overlapped in height with the retaining component 50. In this way, the height of the magnetic component 30 and the retaining component 50 is at least partially overlapped, so that there is a good alignment effect between the magnetic component 30 and the retaining component 50, or there is a good alignment effect between the magnetic component 30 and the retaining component 50, or there is a good alignment effect between the magnetic component 30 and the magnetic field sensing component 40 and the retaining component 50. Therefore, through the retaining component 50, the magnetic component 30 and the magnetic field sensing component 40 can achieve a more accurate detection effect of the displacement caused by the relative movement between the first component and the second component. In the embodiment shown in FIG. 1 , at least the magnetic field sensing member 40 and the retaining member 50 are at least partially highly overlapped, so that the magnetic field sensing member 40 can obtain relatively accurate data from the magnetic member 30 , thereby ensuring measurement accuracy.

[0058] For example, in an embodiment of the present application, the magnetic field sensing member 40 can be disposed on the first component 1, and the magnetic member 30 can be disposed on the second component 2. The first component 1 moves relative to the second component 2, driving the magnetic field sensing member 40 to move relative to the magnetic member 30. The magnetic field sensing member 40 can overlap at least partially with the height of the retaining member 50. Alternatively, the magnetic member 30 can be disposed on the first component 1 and the magnetic field sensing member 40 on the second component 2. The first component 1 moves relative to the second component 2, driving the magnetic member 30 to move relative to the magnetic field sensing member 40, and the magnetic member 30 can overlap at least partially with the height of the retaining member 50. Furthermore, the magnetic field sensing member 40 can be disposed on the first component 1 and the magnetic member 30 on the second component 2, and both the magnetic field sensing member 40 and the magnetic member 30 can overlap at least partially with the height of the retaining member 50, further improving the alignment accuracy between the magnetic field sensing member 40, the magnetic member 30, and the retaining member 50. The specific arrangement of the magnetic field sensing member 40 and the magnetic member 30 is not limited in this embodiment of the present application.

[0059] Specifically, in the embodiment of the present application, the magnetic field sensor 40 can convert the magnetic field signal into an electrical signal and transmit it to a controller, such as a vehicle's on-board computer, which then converts the received electrical signal into a digital signal or an analog signal. Furthermore, the signal conversion process can also be implemented by other controllers, and the embodiment of the present application is not limited thereto.

[0060] For example, in the embodiment of the present application, the magnetic member 30 and the magnetic field sensing member 40 form a magnetic induction sensor. The magnetic member 30 generates a magnetic field, and the magnetic field sensing member 40 can convert the magnetic field signal into an electrical signal using the Hall effect principle, etc. The magnetic induction sensor can be a common Hall effect sensor, a magnetoresistive sensor, etc., which are widely used and readily available. The embodiment of the present application does not limit the specific type of magnetic induction sensor.

[0061] Specifically, in the embodiment of the present application, the second component has a preset travel range when it moves relative to the first component. The magnetic component 30 can output a relatively regular magnetic field distribution within the preset travel range. At different positions within the preset travel range, the magnetic field strength of the magnetic component 30 is different. For example, the relationship between the two can be linear. As shown in FIG3 , the greater the value of the travel within the preset travel range, the stronger the magnetic field strength of the magnetic component 30. Correspondingly, at different positions within the preset travel range, the electrical signal converted by the magnetic field sensing component 40 is also different. For example, the relationship between the two can also be linear. As shown in FIG4 , the greater the value of the travel within the preset travel range, the stronger the electrical signal converted by the magnetic field sensing component 40.

[0062] In practical applications, the first component can be used as a stator and the second component as a mover, with the second component performing reciprocating motion relative to the first component in a linear direction. Alternatively, the second component can be used as a stator and the first component as a mover, with the first component performing reciprocating motion relative to the second component in a linear direction. This embodiment of the present application is not limited to this.

[0063] In the embodiment of the present application, a first opening 51 is provided on the retaining member 50, so that the magnetic field sensing member 40 and the magnetic member 30 are arranged adjacent to each other at the first opening 51. In this way, the magnetic field sensing member 40 and the magnetic member 30 are arranged relative to each other through the first opening 51, so that the magnetic field sensing member 40 can detect the magnetic field changes of the magnetic member 30 through the first opening 51, thereby preventing the retaining member 50 from blocking the magnetic field sensing member 40 and affecting the detection accuracy. For example, during the actual assembly process, the first opening 51 can be arranged relative to the magnetic member 30, the magnetic field sensing member 40 is exposed at the first opening 51, and the retaining member 50 and the magnetic field sensing member 40 can be jointly enclosed on the periphery of the second component.

[0064] In the embodiment of the present application, one of the first component 1 and the second component 2 is connected to the retaining member 50, and the other of the first component and the second component moves along the retaining member 50. In other words, the first component can be connected to the retaining member 50 and the second component can move along the retaining member 50; alternatively, the second component can be connected to the retaining member 50 and the first component can move along the retaining member 50. This enriches the specific connection methods of the first and second components and can be flexibly configured according to actual needs.

[0065] It can be understood that when the first component is connected to the retaining member 50 and the second component moves along the retaining member 50, one of the magnetic field sensing component 40 and the magnetic component 30 is set on the first component or the retaining member 50, and the other is set on the second component; when the second component is connected to the retaining member 50 and the first component moves along the retaining member 50, one of the magnetic field sensing component 40 and the magnetic component 30 is set on the second component or the retaining member 50, and the other is set on the first component.

[0066] In some optional embodiments of the present application, the magnetic field sensing component 40 is arc-shaped, and the magnetic field sensing component 40 is coaxially arranged with the magnetic component 30. In this way, the working surfaces of the magnetic component 30 and the magnetic field sensing component 40 can achieve a better flush effect, so that the two can have better alignment during movement, thereby improving detection accuracy. Specifically, the magnetic component 30 can be connected to the second component, and the magnetic field sensing component 40 is coaxially arranged with the magnetic component 30, that is, the axis of the magnetic field sensing component 40 coincides with the magnetic component 30, so that the magnetic field sensing component 40 and the magnetic component 30 are coaxially arranged.

[0067] For example, in the embodiments of the present application, the magnetic component 30 is a ferromagnetic component or an electromagnetic component, i.e., a coil, and the magnetic field sensing component 40 is a sensing chip. The ferromagnetic component or electromagnetic component and the sensing chip form a magnetic field sensor, which operates based on the Hall effect principle and achieves relatively accurate detection of the movement of the second component. The magnetic component 30 can be either a ferromagnetic component or an electromagnetic component, and the embodiments of the present application do not limit the specific type of the magnetic component 30.

[0068] In the embodiment of the present application, for example, the retaining member 50 may include a bearing, and the bearing may be arranged between the first component and the second component to have a relatively stable connection effect. The embodiment of the present application may not limit the specific type of the retaining member 50.

[0069] In summary, the displacement detection device of the embodiment of the present application has at least the following advantages:

[0070] In an embodiment of the present application, a displacement detection device includes: a first component; a second component, the first component being movable relative to the second component; a retaining member, the retaining member being disposed between the first component and the second component; and a position detecting member 3, the position detecting member 3 being at least partially overlapped in height with the retaining member. Thus, by disposing the retaining member between the first component and the second component and arranging the position detecting member 3 to at least partially overlap in height with the retaining member, when relative motion occurs between the first component and the second component, the position detecting member 3 and the retaining member at least partially overlap in height, so that a larger overlap surface can be formed between the position detecting member 3 and the retaining member in the height direction. At the retaining member, the relative motion between the first component 1 and the second component 2 is more precise, thereby achieving a better alignment effect between the two, and thus achieving a higher detection accuracy for the displacement generated by the relative motion between the first component 1 and the second component 2. This avoids the problem of inaccurate displacement detection caused by the relative motion between the two components when using a grating guide and a grating scanning head for displacement detection, thereby avoiding the problem of inaccurate displacement detection and improving the accuracy of displacement detection.

[0071] The present application also provides a linear motor comprising a stator assembly, a mover assembly, and a displacement detection device. The stator assembly comprises a first component 1 and a first magnet 60 disposed on the first component 1, and the mover assembly comprises a second component 2 and a second magnet 70 disposed on the second component 2. Thus, the stator assembly, the mover assembly, and the displacement detection device constitute a linear motor. The first component is movable relative to the second component. A retaining member 50 of the displacement detection device is disposed between the first and second components, and the position detection member 3 of the displacement detection device is disposed so as to at least partially overlap in height with the retaining member 50.

[0072] Thus, by arranging the retaining member 50 between the first component 1 and the second component 2, and arranging the position detecting member 3 to overlap at least partially with the retaining member 50 in height, when the stator assembly and the mover assembly of the linear motor move relative to each other, when the first component 1 and the second component 2 move relative to each other, since the position detecting member 3 and the retaining member 50 at least partially overlap in height, the position detecting member 3 and the retaining member 50 can have a larger overlapping surface in the height direction, so that the two have a better alignment effect, and thus have a higher detection accuracy for the displacement generated by the relative movement between the first component and the second component, so that the linear motor can have a more accurate detection of the displacement between the stator assembly and the mover assembly during movement. This avoids the relative movement between the two that is prone to offset when using a grating guide and a grating scanning head for displacement detection, avoids the problem of inaccurate displacement detection by the linear motor, and improves the detection accuracy of the linear motor.

[0073] Compared to existing technologies, linear motors typically use a grating sensor consisting of a grating guide and a grating scanning head for displacement detection, which places high demands on the alignment between the grating guide and the grating scanning head. During linear motor operation, vibrations from vehicle movement and other factors can easily cause the grating guide or the grating scanning head to shift, leading to misalignment between the grating guide and the grating scanning head, and inaccurate displacement detection in the linear motor.

[0074] In the embodiment of the present application, the first component is configured as a housing 10, with an accommodating cavity formed therein, and the first magnet 60 is disposed on the housing 10; the second component 2 is configured as a push rod 20, with the second magnet 70 disposed on the push rod 20. At least a portion of the push rod 20 is located within the accommodating cavity, and the push rod 20 is axially movable relative to the housing 10. In practical applications, the housing 10 can be used as the first component, and the push rod 20 can be used as the second component. By providing the accommodating cavity in the first component, the housing 10, a space is provided for the push rod 20, which is the second component, and the push rod 20 can be moved axially relative to the housing 10.

[0075] For example, in an embodiment of the present application, the push rod 20 moves vertically relative to the housing 10. Since the retaining member 50 is disposed between the push rod 20 and the housing 10, the push rod 20 slides vertically relative to the retaining member 50, driving the magnetic member 30 of the position detection member 33 to move vertically relative to the magnetic field sensing member 40. When the push rod 20 reciprocates vertically, the push rod 20 drives the magnetic member 30 to reciprocate, causing the position of the magnetic member 30 to change, thereby changing the magnetic field strength at each position. The magnetic field sensing member 40 is connected to the housing 10, and the magnetic member 30 is disposed opposite the magnetic field sensing member 40. The movement of the push rod 20 relative to the retaining member 50 drives the magnetic member 30 to move vertically relative to the magnetic field sensing member 40, resulting in a better alignment effect between the magnetic member 30 and the magnetic field sensing member 40. The magnetic field sensing element 40 senses the change in magnetic field strength to generate a magnetic field signal, and converts the magnetic field signal into an electrical signal, which can then be converted into a digital signal or an analog signal, etc., to obtain the displacement change of the push rod 20, and adjust the vibration reduction force output by the linear motor through the displacement change of the push rod 20.

[0076] In the embodiment of the present application, a port 11 is provided at one end of the housing 10, the push rod 20 is accommodated in the port 11, and the magnetic field sensing component 40 is connected to the port 11. Since other electrical components are usually provided in the housing 10, during the operation of the linear motor, a relatively high temperature, such as 80°, 100°, 150°, etc., is usually generated inside the housing 10. In the embodiment of the present application, the magnetic field sensing component 40 is disposed at the port 11 of the housing 10, so that the magnetic field sensing component 40 is exposed to the housing 10, avoiding areas of the housing 10 that are prone to high temperatures. The magnetic field sensing component 40 can be cooled by natural wind and other means to dissipate heat, thereby preventing the magnetic field sensing component 40 from being easily heat-failed and extending the service life of the magnetic field sensing component 40.

[0077] For example, in an embodiment of the present application, the retaining member 50 can be connected to the port 11 and sleeved on the outer periphery of the push rod 20 to limit the movement of the push rod 20. In this way, the push rod 20 moves along the retaining member 50, preventing the push rod 20 from easily deviating during the movement of the vehicle as shown in Figure 5. The greater the deflection angle of the push rod 20, the greater the impact on the detection accuracy of the magnetic field sensing member 40 and the magnetic member 30, and even failure. Therefore, the retaining member 50 ensures that the magnetic member 30 has better alignment with the magnetic field sensing member 40 during movement, and has higher detection accuracy.

[0078] In some optional embodiments of the present application, the port 11 of the housing 10 is provided with a second opening 13, the second opening 13 is arranged opposite to the first opening 51, and the magnetic field sensing component 40 is connected to the second opening 13. In this way, the magnetic field sensing component 40 can be connected to the port 11 of the housing 10. Since the first opening 51 is arranged opposite to the magnetic component 30 and the second opening 13 is arranged opposite to the first opening 51, the second opening 13 of the port 11 of the housing 10 is also arranged opposite to the magnetic component 30. The magnetic field sensing component 40 is connected to the second opening 13, which can also achieve the relative arrangement between the magnetic field sensing component 40 and the magnetic component 30, so that there is good alignment between the two.

[0079] For example, the magnetic field sensing element 40 is connected to the retaining element 50. In the embodiment of the present application, the magnetic field sensing element 40 can be connected to the port 11 of the housing 10 as well as the retaining element 50. Specifically, the magnetic field sensing element 40 can be connected to the first opening 51 of the retaining element 50, thereby providing the magnetic field sensing element 40 with better connection reliability. In addition, the magnetic field sensor can also be connected to the port 11 of the housing 10 and the retaining element 50 at the same time to improve the connection stability of the magnetic field sensing element 40. This embodiment of the present application is not limited to this.

[0080] In the embodiment of the present application, the magnetic member 30 is connected to the outer wall of the push rod 20 and extends along the axial direction of the push rod 20. The magnetic member 30 also extends circumferentially of the push rod 20. This allows the magnetic member 30 to have a good fit with the push rod 20. For example, the magnetic member 30 can be a long strip-shaped magnetic member. As the push rod 20 slides along the housing 10, the magnetic member 30 can generate a large magnetic field with a certain strength, thereby creating a larger working surface between the magnetic member 30 and the magnetic field sensing member 40, thereby improving the accuracy of the magnetic field sensing member 40 in sensing magnetic field changes.

[0081] In the embodiment of the present application, the first magnet 60 is connected to the inner wall of the housing 10, and the second magnet 70 is connected to the outer wall of the push rod 20 and located within the accommodating cavity. The first magnet 60 is a permanent magnet or an electromagnet, and the second magnet 70 is a coil. Thus, by connecting the first magnet 60 to the inner wall of the housing 10, the first magnet 60 has a better connection stability, preventing external impurities from affecting the first magnet 60. By connecting the second magnet 70 to the outer wall of the push rod 20 and being located within the accommodating cavity, the second magnet 70 has a better connection stability, also preventing external impurities from affecting the second magnet 70.

[0082] For example, in an embodiment of the present application, the first magnet 60 can be a permanent magnet, and the second magnet 70 can be a coil; or, the first magnet 60 can be an electromagnetic component, and the second magnet 70 can be a coil. By controlling the current of the coil of the second magnet 70, the driving force of the above-mentioned linear motor is controlled. The embodiment of the present application does not limit the specific types of the first magnet 60 and the second magnet 70. For example, the second magnet 70 is arranged opposite to the first magnet 60. In this way, the first magnet 60 and the second magnet 70 can be used to make the linear motor have a better electromagnetic driving force and a more stable and reliable driving force.

[0083] Furthermore, in the embodiment of the present application, the magnetic force generated between the first magnet 60 and the second magnet 70 may also cause one end of the push rod 20 to deflect, causing the push rod 20 to deflect. In the embodiment of the present application, by providing the retaining member 50 to restrict the movement of the push rod 20, the magnetic force generated between the first magnet 60 and the second magnet 70 is prevented from causing the push rod 20 to deflect. This ensures that the magnetic member 30 on the push rod 20 is well aligned with the magnetic field sensing member 40 during movement, resulting in higher detection accuracy.

[0084] In the embodiment of the present application, the housing 10 is provided with a contact area 14, and the push rod 20 is slidably connected to the housing 10 in the contact area 14. In the contact area 14, the magnetic field generated by the first magnet 60 and the second magnet 70 near the magnetic field sensing element 40 is a divergent magnetic field. As shown in FIG7 , where the arrows indicate the direction of the magnetic field, since the magnetic field generated by the first magnet 60 and the second magnet 70 near the magnetic field sensing element 40 in the contact area 14 is a divergent magnetic field, and the magnetic field sensing element 40 is disposed at the end of the housing 10, the magnetic field sensing element 40 is isolated from the first magnet 60 and the second magnet 70 by the housing. This makes it difficult for the first magnet 60 and the second magnet 70 to interfere with the magnetic field sensing element 40, thus avoiding interference with the magnetic field generated by the magnetic element 30. This allows the magnetic field sensing element 40 to detect the movement of the magnetic element 30 with better accuracy. This prevents the magnetic field generated by the first magnet 60 and the second magnet 70 near the magnetic field sensing element 40 in the contact area 14 from forming a loop, as shown in FIG8 , where the arrows indicate the direction of the magnetic field, thereby reducing interference with the magnetic field sensing element 40.

[0085] In the embodiment of the present application, the shell 10 and the push rod 20 are made of non-magnetic material. The use of non-magnetic material to make the shell 10 and the push rod 20 makes the magnetic resistance of the shell 10 and the push rod 20 close to the magnetic resistance of the air, so that the magnetic field generated by the first magnet 60 and the second magnet 70 in the contact area 14 near the magnetic field sensing part 40 is a divergent magnetic field, which is not easy to interfere with the magnetic field sensing part 40, avoiding interference with the magnetic field generated by the magnetic part 30, so that the magnetic field sensing part 40 has better detection accuracy for the movement of the magnetic part 30. The use of magnetic conductive material to form a closed magnetic field loop in Figure 8 is avoided, so that the magnetic field strength of the first magnet 60 and the second magnet 70 at the position where the magnetic field sensing part 40 is located is low, reducing the interference with the magnetic field sensing part 40.

[0086] For example, in the embodiment of the present application, the non-magnetic conductive material is aluminum alloy. Specifically, the housing 10 and the push rod 20 can be made of aluminum alloy, so that the magnetic resistance of the housing 10 and the push rod 20 is close to that of air, thereby reducing interference with the magnetic field sensing element 40. Furthermore, aluminum alloy is widely used and readily available.

[0087] In the embodiment of the present application, the distance between the magnetic member 30 and the first magnet 60 along the axial direction of the push rod 20 is greater than or equal to 20 mm. Since the magnetic field strength generated by the magnet weakens as the distance from the magnetic field source increases, that is, the farther the distance from the magnet is, the smaller the magnetic field strength is. Therefore, the distance between the magnetic member 30 and the first magnet 60 along the axial direction of the housing 10 is set to be greater than or equal to 20 mm, so that the distance between the magnetic member 30 and the first magnet 60 is farther, further reducing the interference caused by the first magnet 60 on the magnetic field sensing member 40.

[0088] For example, in the embodiment of the present application, the minimum spacing between the magnetic field sensing member 40 and the second magnet 70 along the axial direction of the push rod 20 is greater than or equal to 40 mm. Since the second magnet 70 is connected to the push rod 20, and the distance between the second magnet 70 and the magnetic field sensing member 40 changes when the push rod 20 reciprocates, the spacing between the magnetic member 30 and the first magnet 60 is set to be greater than or equal to 40 mm. This increases the distance between the magnetic member 30 and the second magnet 70 along the axial direction of the housing 10. Even when the distance between the second magnet 70 and the magnetic field sensing member 40 is smaller, that is, greater than or equal to 40 mm, the interference caused by the second magnet 70 on the magnetic field sensing member 40 can be reduced.

[0089] In summary, the linear motor according to the embodiment of the present application may have at least the following advantages:

[0090] In an embodiment of the present application, a linear motor includes a stator assembly, a mover assembly, and a displacement detection device, wherein the stator assembly includes a first component and a first magnet disposed on the first component, and the mover assembly includes a second component and a second magnet disposed on the second component. The displacement detection device includes: a first component; a second component, wherein the first component is movable relative to the second component; a retaining member disposed between the first component and the second component; and a position detecting member, wherein the position detecting member and the retaining member at least partially overlap in height. Thus, by disposing the retaining member between the first component and the second component and arranging that the position detecting member and the retaining member at least partially overlap in height, when relative motion occurs between the first component and the second component, since the position detecting member and the retaining member at least partially overlap in height, a larger overlapping surface can be formed between the position detecting member and the retaining member in the height direction, thereby achieving a better alignment effect between the two, thereby achieving a higher detection accuracy of the displacement generated by the relative motion between the first component and the second component. This avoids the problem of inaccurate displacement detection caused by the relative movement between the grating guide rail and the grating scanning head when the grating guide rail and the grating scanning head are used for displacement detection, thereby improving the accuracy of displacement detection.

[0091] An embodiment of the present application further proposes an electromagnetic shock absorber, which includes the above-mentioned linear motor. The electromagnetic shock absorber can be applied to an active suspension to provide driving force for the suspension.

[0092] The electromagnetic shock absorber in the embodiment of the present application may have at least the following advantages:

[0093] In an embodiment of the present application, an electromagnetic shock absorber includes the aforementioned linear motor, which includes a stator assembly, a mover assembly, and a displacement detection device. The stator assembly includes a first component and a first magnet disposed on the first component, and the mover assembly includes a second component and a second magnet disposed on the second component. The displacement detection device includes: a first component; a second component capable of moving relative to the second component; a retaining member disposed between the first and second components; and a position detecting member, the position detecting member and the retaining member at least partially overlapping in height.

[0094] In this way, by arranging the retaining member between the first component and the second component and arranging the position detecting member to overlap at least partially in height with the retaining member, when the first component and the second component perform relative movement, the position detecting member and the retaining member at least partially overlap in height, thereby enabling the position detecting member and the retaining member to have a larger overlapping surface in the height direction, thereby achieving a better alignment effect between the two, thereby achieving higher detection accuracy for the displacement generated by the relative movement between the first component and the second component. This avoids the problem of relative movement between the two easily causing offset when using a grating guide rail and a grating scanning head for displacement detection, avoids the problem of easily causing inaccurate displacement detection, improves the accuracy of displacement detection, thereby improving the damping effect of the electromagnetic shock absorber, and avoids the problem of the electromagnetic shock absorber being unable to output the corresponding damping force through the linear motor.

[0095] An embodiment of the present application also provides a vehicle, which includes the above-mentioned electromagnetic shock absorber.

[0096] For example, vehicles may include small cars, mid-sized cars, sedans, trucks, trailers, CDVs (Car Derived Vans), MPVs (Multi-Purpose Vehicles), SUVs (Sport Utility Vehicles), etc. The embodiments of the present application do not limit the specific types of vehicles.

[0097] The vehicle in the embodiment of the present application may have at least the following advantages:

[0098] In an embodiment of the present application, a vehicle includes an electromagnetic shock absorber, the electromagnetic shock absorber includes a linear motor, the linear motor includes a stator assembly, a mover assembly, and a displacement detection device, the stator assembly includes a first component and a first magnet disposed on the first component, the mover assembly includes a second component and a second magnet disposed on the second component. The displacement detection device includes: a first component; a second component, the first component being movable relative to the second component; a retaining member disposed between the first component and the second component; and a position detecting member, the position detecting member and the retaining member at least partially overlapping in height. Thus, by disposing the retaining member between the first component and the second component and arranging the position detecting member and the retaining member to at least partially overlap in height, when the first component and the second component move relative to each other, the position detecting member and the retaining member at least partially overlap in height, thereby providing a larger overlap surface in the height direction between the position detecting member and the retaining member, thereby achieving a better alignment effect between the two components, thereby achieving higher detection accuracy of the displacement generated by the relative movement between the first component and the second component. This eliminates the problem of displacement detection errors caused by the relative motion between the grating guide and the grating scanning head, thereby improving the accuracy of displacement detection and enhancing the damping effect of the electromagnetic shock absorber. It also eliminates the problem of the electromagnetic shock absorber being unable to output the corresponding damping force through the linear motor, thereby improving the vehicle's damping effect and enhancing driving comfort.

[0099] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0100] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A displacement detection device, comprising: A first component; A second component, wherein the first component is capable of moving relative to the second component; A holding member disposed between the first component and the second component; And A position detection member, wherein the position detection member at least partially coincides in height with the holding member.

2. The displacement detection device according to claim 1, wherein, The position detection member includes a magnetic member and a magnetic field induction member; One of the magnetic member and the magnetic field induction member is connected to the first component, the other of the magnetic member and the magnetic field induction member is connected to the second component, and the magnetic member and the magnetic field induction member are oppositely disposed; At least one of the magnetic member and the magnetic field induction member at least partially coincides in height with the holding member.

3. The displacement detection device according to claim 2, wherein, The holding member is provided with a first opening so that the magnetic field induction member and the magnetic member are adjacently disposed at the first opening.

4. The displacement detection device according to any one of claims 1 to 3, wherein, One of the first component and the second component is connected to the holding member, and the other of the first component and the second component moves along the holding member.

5. The displacement detection device according to any one of claims 2 to 4, wherein, The magnetic field induction member is arc-shaped and is coaxially disposed with the magnetic member.

6. The displacement detection device according to any one of claims 2 to 4, wherein, The magnetic member is a ferromagnetic member or an electromagnetic member, and the magnetic field induction member is an induction chip.

7. The displacement detection device according to any one of claims 1-6, wherein, The holding member includes a bearing.

8. A linear motor, comprising a stator assembly, a mover assembly, and the displacement detection device according to any one of claims 1-7, wherein the stator assembly includes the first component and a first magnet disposed on the first component, and the mover assembly includes the second component and a second magnet disposed on the second component.

9. The linear motor according to claim 8, wherein, The first component is configured as a housing, and an accommodation cavity is formed in the housing, and the first magnet is disposed on the housing; The second component is configured as a push rod, the second magnet is disposed on the push rod, and at least a part of the structure of the push rod is located in the accommodation cavity and the push rod axially moves relative to the housing.

10. The linear motor according to claim 9, wherein, The position detection member includes a magnetic member and a magnetic field induction member; One end of the housing is provided with a port, the push rod is accommodated in the port, the magnetic field induction member is connected to the port, the magnetic member is disposed on the push rod, and the magnetic field induction member at least partially coincides in height with the holding member.

11. The linear motor according to claim 10, wherein, The holding member is provided with a first opening so that the magnetic field induction member and the magnetic member are adjacently disposed at the first opening; The port is provided with a second opening, the second opening is oppositely disposed to the first opening, and the magnetic field induction member is connected to the second opening.

12. The linear motor according to any one of claims 9 to 11, wherein, The position detection member includes a magnetic member and a magnetic field induction member, and the magnetic field induction member is connected to the holding member.

13. The linear motor according to claim 12, wherein, The magnetic member is connected to the outer wall of the push rod and extends along the axial direction of the push rod, and the magnetic member extends in the circumferential direction of the push rod.

14. The linear motor according to any one of claims 9 to 13, wherein, The first magnet is connected to the inner wall of the housing, the second magnet is connected to the outer wall of the push rod and is located in the accommodation cavity, the first magnet is a permanent magnet or an electromagnet, and the second magnet is a coil.

15. The linear motor according to any one of claims 9 to 13, wherein, Both the housing and the push rod are made of non-magnetic materials.

16. The linear motor according to claim 15, wherein, The non-magnetic material is aluminum alloy.

17. The linear motor according to any one of claims 9 to 16, wherein, The distance between the magnetic member and the first magnet along the axial direction of the push rod is greater than or equal to 20 mm.

18. The linear motor according to any one of claims 9 to 16, wherein, The minimum distance between the magnetic field induction component and the second magnet along the axial direction of the push rod is greater than or equal to 40 mm.

19. An electromagnetic shock absorber, comprising the linear motor according to any one of claims 8-18.

20. A vehicle, comprising the electromagnetic shock absorber according to claim 19.

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