CN220542226U

CN220542226U - Load sensor for vehicle and vehicle

Info

Publication number: CN220542226U
Application number: CN202321385745.5U
Authority: CN
Inventors: 张石柱; 杨伟; 崔秀锦; 段巍; 王耀民
Original assignee: Yangzhou Byd Semiconductor Co ltd
Current assignee: Yangzhou Byd Semiconductor Co ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2024-02-27
Anticipated expiration: 2033-05-31

Abstract

The utility model discloses a load sensor for a vehicle and a vehicle, wherein the load sensor comprises: casing, swing arm subassembly and control panel. The swing arm assembly is movably connected with the shell, and a rotor is arranged on the swing arm assembly. The control panel is located in the casing, and when swing arm subassembly moved for the casing, the swing arm drove the rotor and rotated for the control panel, is equipped with transmitting coil and receiving coil on the control panel, and transmitting coil is used for producing alternating excitation magnetic field, and receiving coil is used for producing the output voltage when the induced electromotive force in the rotor rotates with the control panel in order to cut excitation magnetic field. Therefore, the load sensor has higher sensitivity and anti-interference capability, the measuring result precision of the load sensor is higher, the structure of the load sensor can be simplified, the assembly of the load sensor is convenient, the assembly efficiency is improved, and the production and manufacturing cost of the load sensor is saved.

Description

Load sensor for vehicle and vehicle

Technical Field

The utility model relates to the technical field of vehicles, in particular to a load sensor for a vehicle and the vehicle.

Background

In the prior art, a load sensor for weighing a vehicle relates to a plurality of parts, and the assembly process is complex, so that the self cost of the load sensor and the labor cost of assembly are increased. In order to enable all parts of the load sensor to be connected with each other, more bolts are adopted, and the risk point of failure of the load sensor is increased. In the prior art, a magnetic field is generated by using a magnet according to a Hall principle, the change of the relative position of a target is measured through the change of the magnetic field, so that the change of weight is known, and the obtained result has lower accuracy.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, a first object of the present utility model is to propose a load sensor for a vehicle, which can improve the accuracy of the load sensor and simplify the assembly process of the load sensor.

A second object of the present utility model is to propose a vehicle comprising a load sensor for a vehicle as described in the above embodiments.

A load sensor for a vehicle according to an embodiment of the first aspect of the present utility model includes: the device comprises a shell, a swing arm assembly and a control board, wherein the swing arm assembly is movably connected with the shell, a rotor is arranged on the swing arm assembly, the control board is arranged in the shell, when the swing arm assembly moves relative to the shell, the swing arm assembly drives the rotor to rotate relative to the control board, a transmitting coil, a receiving coil and a control device are arranged on the control board, the transmitting coil is used for generating an alternating exciting magnetic field, the receiving coil is used for outputting voltage when the rotor rotates relative to the control board to cut the exciting magnetic field to generate induced electromotive force, and the control device is suitable for converting the output voltage into load information of a vehicle.

According to the load sensor for the vehicle, the transmitting coil and the receiving coil are arranged on the control board so as to apply the inductance principle, so that the load sensor has higher sensitivity and anti-interference capability, the measuring result precision of the load sensor is higher, meanwhile, the structure of the load sensor can be simplified, the use of parts is reduced, the assembly of the load sensor is convenient, the assembly efficiency is improved, and the production and manufacturing cost of the load sensor is saved.

In some embodiments, the swing arm assembly includes: the rotary shaft is movably arranged on the shell in a penetrating mode, the rotor is arranged at one end, located in the shell, of the rotary shaft, and one end of the swing arm is connected with the rotary shaft.

In some embodiments, the one end of the rotating shaft is provided with a mounting protrusion extending towards the control board, and the rotor is sleeved on the mounting protrusion.

In some embodiments, the mounting protrusion includes a first protrusion section and a second protrusion section which are sequentially connected along a direction away from the center of the rotating shaft, the rotor is sleeved on the first protrusion section, a threaded fastener is arranged at the second protrusion section, and the rotor is clamped between the second protrusion section and an end face of the rotating shaft, which faces the control panel.

In some embodiments, the housing comprises: the shell body and the cover body, one side, far away from the swing arm assembly, of the shell body is an open side, the cover body is arranged on the open side of the shell body, the cover body and the shell body jointly define a containing cavity, and the control panel is arranged in the containing cavity.

In some embodiments, the housing further comprises: and the rotor cover is covered outside the rotor and is positioned between the rotor and the control board.

In some embodiments, the control panel is provided with an avoidance hole, the rotor cover is provided with an avoidance groove, the avoidance groove is formed by protruding a part of the rotor cover towards the direction of the control panel, one end, adjacent to the control panel, of the installation protrusion extends into the avoidance groove, and the avoidance groove is matched with the avoidance hole.

In some embodiments, the housing body has a first mating portion extending toward the control board therein, and an outer peripheral edge of the rotor cover is interference-fitted with an inner peripheral wall of the first mating portion to fix the rotor cover to the housing body.

In some embodiments, a plurality of hot-melt columns are arranged in the shell body at intervals along the circumferential direction of the rotating shaft, and the control panel is in hot-melt connection with the shell body through the plurality of hot-melt columns.

In some embodiments, at least one guide post is disposed in the housing body, the guide post is adjacent to the hot melt post, at least one guide hole is formed on the control board, and the guide post is fitted in the guide hole.

In some embodiments, the open side of the housing body is formed with a glue-pouring slot, the edge of the cover fits in the glue-pouring slot, and glue is poured into the glue-pouring slot to realize connection between the cover and the housing body.

In some embodiments, a plurality of glue-pouring groove reinforcing ribs are arranged in the glue-pouring groove at intervals along the circumferential direction of the shell body.

In some embodiments, a plurality of shell reinforcing ribs are arranged on the inner peripheral wall of the shell body at intervals along the circumferential direction of the shell body.

In some embodiments, at least one mounting error preventing post is provided on a surface of the cover facing the housing body.

In some embodiments, the rotor is opposite to and spaced apart from the control board by a distance L, wherein the L satisfies: l is more than or equal to 1.5mm and less than or equal to 2.5mm.

In some embodiments, the swing arm comprises: swing arm sheath, swing arm body, the swing arm sheath is established with the swing on the casing, be formed with the holding tank on the swing arm sheath, the one end cooperation of swing arm body is in the holding tank, the other end of swing arm body stretches out outside the holding tank.

In some embodiments, the swing arm sheath comprises: sheath body, sheath lateral wall, sheath body is swingingly established on the casing, the sheath lateral wall is connected the edge of sheath body, the sheath lateral wall orientation is kept away from the direction of casing extends, the sheath lateral wall with jointly prescribe a limit to between the sheath body the holding tank, the circumference both ends of sheath lateral wall are spaced apart from each other in order to prescribe a limit to the opening, the swing arm body keep away from the one end of casing is followed the opening part stretches out, the swing arm body pass through at least one fastener with the sheath body links to each other.

In some embodiments, the casing is provided with a through hole, the rotating shaft penetrates through the through hole, the casing is provided with a groove, the groove surrounds the periphery side of the rotating shaft, the swing arm sheath is provided with an extension part extending towards the casing, and the extension part is rotatably matched in the groove.

In some embodiments, a seal is disposed between the groove and the extension.

In some embodiments, a second matching part is arranged on the side wall of the through hole, the rotating shaft penetrates through the second matching part, and a bearing is arranged at the position of the rotating shaft and the second matching part.

In some embodiments, a matching groove is formed on the rotating shaft, the matching groove is located on one side, far away from the rotor, of the bearing, and a clamp spring is arranged in the matching groove and is abutted to the bearing.

In some embodiments, further comprising: the sealing piece is arranged between the inner peripheral wall of the through hole and the outer peripheral surface of the rotating shaft and is positioned on one side, far away from the bearing, of the clamping spring.

In some embodiments, the rotating shaft is provided with a step part, the swing arm is sleeved outside the rotating shaft and supported on the step part, a fastener is arranged on the rotating shaft to fix the swing arm and the rotating shaft, and the fastener is positioned on one side of the swing arm far away from the step part.

In some embodiments, a mounting bracket is provided on a side of the housing remote from the swing arm assembly.

In some embodiments, the mounting bracket comprises: the device comprises a shell, a swing arm assembly, a first support portion and a second support portion, wherein the first support portion is connected with one side, far away from the swing arm assembly, of the shell, one end of the second support portion is connected with the first support portion, and the other end of the second support portion extends towards the direction far away from the swing arm assembly.

In some embodiments, the load sensor further comprises: and the connecting rod is rotatably connected with one end, far away from the shell, of the swing arm assembly.

In some embodiments, a first receiving hole is formed at an end of the link connected to the swing arm assembly, and the load sensor further includes: the first swing arm ball head comprises a first ball head part and a first connecting part which are connected with each other, the first ball head part is rotatably matched in the first accommodating hole, and the first connecting part is connected with the swing arm.

In some embodiments, an end of the link remote from the swing arm assembly is formed with a second receiving hole, and the load sensor further includes: the second swing arm ball head comprises a second ball head part and a second connecting part which are connected with each other, and the second ball head part is rotatably matched in the second accommodating hole.

In some embodiments, the link is a flexible link.

In some embodiments, the receiving coil includes a first receiving coil and a second receiving coil connected to each other, the transmitting coil and the first receiving coil are located at one side of the control board, the second receiving coil is located at the other side of the control board, eddy currents are induced in the surface of the rotor in the exciting magnetic field, the eddy currents form a reverse magnetic field opposite to the exciting magnetic field, and the reverse magnetic field changes induced electromotive forces of the first receiving coil and the second receiving coil to affect output voltages of the first receiving coil and the second receiving coil.

In some embodiments, the first receiving coil includes a plurality of first coil segments arranged at intervals along a circumference of the rotational axis of the rotor, the plurality of first coil segments being offset from a radial direction of the rotational axis of the rotor in a first direction from inside to outside; the second receiving coil comprises a plurality of second coil sections, the second coil sections are arranged at intervals along the circumference of the rotation axis of the rotor, one end of each second coil section is connected with one end of each first coil section, the other end of each second coil section is connected with the other end of the corresponding first coil section, the second coil sections deviate from the radial direction of the rotation axis of the rotor from inside to outside along a second direction, and the second direction is opposite to the first direction.

In some embodiments, the transmit coil is located on the outer peripheral side of the first receive coil and the second receive coil.

In some embodiments, the transmitting coil, the first receiving coil, the second receiving coil are arranged coaxially with the rotor.

In some embodiments, the orthographic projections of the transmitting coil, the first receiving coil, and the second receiving coil on the rotor are located within an edge of the rotor.

According to an embodiment of the second aspect of the present utility model, a vehicle includes: the load sensor according to any one of the above embodiments, wherein a housing of the load sensor is provided on the frame, and the other end of a swing arm of the load sensor is provided on the axle.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view of a load sensor for a vehicle according to an embodiment of the present utility model.

Fig. 2 is a schematic view of a swing arm assembly according to an embodiment of the utility model.

Fig. 3 is a schematic cross-sectional view of a load sensor for a vehicle according to an embodiment of the utility model.

Fig. 4 is an enlarged schematic view of the portion P in fig. 3.

Fig. 5 is a perspective exploded view of a load sensor for a vehicle according to an embodiment of the present utility model.

Fig. 6 is a schematic view of a housing body according to an embodiment of the present utility model.

Fig. 7 is a schematic view of a cover according to an embodiment of the present utility model.

Fig. 8 is a schematic diagram between a receiving coil, a transmitting coil and a load sensor chip for a vehicle according to an embodiment of the utility model.

Fig. 9 is a schematic diagram of a receive coil and a transmit coil according to an embodiment of the utility model.

Fig. 10 is a schematic partial cross-sectional view of a control board according to an embodiment of the present utility model.

Fig. 11 is a signal diagram of a load sensor for a vehicle according to an embodiment of the present utility model.

Reference numerals:

100. a load sensor;

10. a housing; 11. a housing body; 111. a first mating portion; 112. a hot melt column; 113. a guide post; 114. a glue filling groove; 1141. reinforcing ribs of glue pouring grooves; 115. a shell reinforcing rib; 116. a groove; 117. a seal ring; 118. a second mating portion; 119. a through hole; 12. a cover body; 121. installing an error-proof column; 13. a receiving chamber; 14. a rotor cover; 141. avoiding the groove part; 15. a bearing; 16. clamping springs; 161. a mating groove; 17. a mounting bracket; 171. a first bracket portion; 172. a second bracket portion;

20. a swing arm assembly; 21. swing arms; 211. swing arm sheath; 2111. a receiving groove; 2112. a sheath body; 2113. a jacket sidewall; 2114. an opening; 2115. an extension; 212. a swing arm body; 22. a rotating shaft; 221. mounting the bulge; 2211. a first raised section; 2212. a second raised section; 2213. a threaded fastener; 222. a fastener; 223. a step portion; 23. a rotor; 24. a seal;

31. A control board; 311. a transmitting coil; 312. a receiving coil; 3121. a first receiving coil; 3122. a second receiving coil; 313. avoidance holes; 314. a sensor chip; 315. a first coil section; 316. a second coil segment;

40. a connecting rod; 41. a first accommodation hole; 42. a first swing arm ball head; 421. a first bulb portion; 422. a first connection portion; 43. a second accommodation hole; 44. the second swing arm ball head; 441. a second bulb portion; 442. and a second connecting part.

Detailed Description

Embodiments of the present utility model are described in detail below, with reference to the accompanying drawings, and the embodiments described below describe a load sensor 100 for a vehicle according to an embodiment of the present utility model with reference to fig. 1 to 11, the load sensor 100 including: housing 10, swing arm assembly 20, and control board 31.

Specifically, as shown in fig. 1 to 10, the swing arm assembly 20 is movably connected with the housing 10, a rotor 23 is disposed at an end of the swing arm assembly 20 extending into the housing 10, and a control board 31 is disposed in the housing 10, and when the swing arm assembly 20 moves relative to the housing 10, the swing arm assembly 20 drives the rotor 23 to rotate relative to the control board 31. The control board 31 is provided with a transmitting coil 311 for generating an alternating exciting magnetic field, a receiving coil 312 for outputting a voltage when the rotor 23 rotates relative to the control board 31 to cut the exciting magnetic field to generate an induced electromotive force, and a control device adapted to convert the output voltage into load information of the vehicle.

The load sensor 100 may be an inductive weighing sensor, the load sensor 100 generates displacement under the action of external gravity, the rotor 23 cuts magnetic induction lines in an exciting magnetic field to change the induced electromotive force of the receiving coil 312, the control of the load sensor 100 is performed, the load sensor 100 is internally provided with a control board 31, and a transmitting coil 311, a receiving coil 312 and a control device electrically connected with the control board 31, the control device comprises a sensor chip 314 and a micro control unit (not shown), and the transmitting coil 311 and the receiving coil 312 form a closed loop on the control board 31 after passing through the sensor chip 314 and the micro control unit. As shown in fig. 8 and 9, the transmitting coil 311 is distributed outside the receiving coil 312 in a double-layer distribution with the same number of excitation coil turns for each layer. The sensor chip 314 performs synchronous demodulation and filtering processing on the output voltage of the receiving coil 312, the control board 31 obtains the processed voltage signal, performs arctangent analysis to obtain the rotation angle of the swing arm assembly 20, and then converts the angle information into a PWM signal and outputs the PWM signal to the control unit for analysis to obtain the load information of the vehicle.

According to the load sensor 100 for the vehicle, according to the embodiment of the utility model, the transmitting coil 311 and the receiving coil 312 are arranged on the control board 31 to apply the inductance principle, so that the load sensor 100 has higher sensitivity and anti-interference capability, the measuring result precision of the load sensor 100 is higher, meanwhile, the structure of the load sensor 100 can be simplified, the use of parts is reduced, the assembly of the load sensor 100 is facilitated, the assembly efficiency is improved, and the production and manufacturing costs of the load sensor 100 are saved.

In some embodiments, as shown in fig. 2-3, the swing arm assembly 20 includes: the rotary shaft 22 and the swing arm 21, the rotary shaft 22 is movably arranged on the shell 10 in a penetrating way, the rotor 23 is arranged at one end of the rotary shaft 22, which is positioned in the shell 10, and one end of the swing arm 21 is connected with the rotary shaft 22. The pivot 22 is located the one end of swing arm assembly 20 adjacent casing 10, and the one end and the swing arm 21 of pivot 22 are connected, and the other end of pivot 22 stretches into in the casing 10 along the direction of perpendicular swing arm 21, and the one end of pivot 22 keeping away from swing arm 21 is located to rotor 23, and rotor 23 follows the rotation of swing arm 21 and rotates, because the size of the induced electromotive force that the receiving coil 312 that is located in the excitation magnetic field induction can be changed to rotor 23, influences receiving coil 312's output voltage. Therefore, the swing arm assembly 20 includes the rotating shaft 22 and the swing arm 21, so that the swing arm 21 rotates relative to the housing 10 through the rotating shaft 22, so that the output voltage of the receiving coil 312 can be determined according to the influence of the rotor 23 on the induced electromotive force generated by the receiving coil 312 in the exciting magnetic field, which is beneficial to accurately obtaining the measurement result of the load sensor 100.

In some embodiments, as shown in fig. 3 to 5, a mounting protrusion 221 extending toward the control board 31 is provided on one end of the rotating shaft 22, that is, one end of the rotating shaft 22 extending into the housing 10, and the rotor 23 is sleeved on the mounting protrusion 221. For example, the rotor 23 is screw-fitted or interference-fitted with the mounting boss 221. Thus, the installation of the rotor 23 can be facilitated by the installation protrusions 221, the installation structure of the rotor 23 is simple, and the installation efficiency of the rotor 23 and the rotating shaft 22 is improved.

In some embodiments, referring to fig. 4, the mounting boss 221 includes a first boss section 2211 and a second boss section 2212 connected in sequence in a direction away from the center of the rotation shaft 22, the rotor 23 is sleeved on the first boss section 2211, a threaded fastener 2213 is provided at the second boss section 2212, and the rotor 23 is sandwiched between the second boss section 2212 and an end surface of the rotation shaft 22 facing the end of the control board 31. That is, the mounting boss 221 includes a first boss portion 2211 and a second boss portion 2212 connected to each other, and the cross-sectional shapes of the first boss portion 2211 and the second boss portion 2212 may be maintained to be the same or different, and the outer circumferential surface of the second boss portion 2212 is provided with threads, and the mounting of the rotor 23 is achieved by providing a threaded fastener 2213 at the second boss portion 2212 after the first boss portion 2211 is engaged with the rotor 23, so that the threaded fastener 2213 is connected to the second boss portion 2212. Thus, the arrangement of the first and second protruding sections 2211 and 2212 can facilitate the installation of the rotor 23, and the installation of the rotor 23 is realized by the threaded fastener 2213 with simple structure and high installation stability.

In some embodiments, as shown in fig. 3 and 5, the housing 10 includes: the shell body 11 and the cover body 12, wherein one side of the shell body 11 far away from the swing arm assembly 20 is opened to form an open side, the cover body 12 is arranged on the open side of the shell body 11, namely, the side far away from the swing arm assembly 20, the cover body 12 and the shell body 11 jointly define a containing cavity 13, and the control board 31 is arranged in the containing cavity 13. For example, one end of the swing arm assembly 20 extends into the housing 10 from a side of the housing body 11 away from the cover 12, and further when the rotating shaft 22 extends into the accommodating cavity 13, the rotor 23 is connected to one end of the rotating shaft 22 located in the accommodating cavity 13, and the rotor 23 is opposite to the control board 31 in the accommodating cavity 13, so that the rotor 23 can influence the variation of the induced electromotive force generated in the control board 31, so as to obtain the rotating angle of the rotor 23. Therefore, the housing body 11 is opened at one side, so that the control board 31 and the like can be conveniently mounted, the formed accommodating cavity 13 can protect the control board 31, the excitation magnetic field generated by the control board 31 is prevented from being interfered by the external environment, and the accuracy of the measurement result of the load sensor 100 is improved.

Further, with reference to fig. 3, the rotor cover 14 is covered outside the rotor 23, and the rotor cover 14 is located between the rotor 23 and the control board 31. The rotor cover 14 is opened toward the rotor 23 to cover the rotor 23, and the outer periphery of the rotor cover 14 is stopped against the housing body 11. After the rotor 23 and the rotating shaft 22 are mounted, when the rotor cover 14 is connected to the housing body 11, the side wall of the rotor cover 14 is stopped against a part of the inner wall of the housing body 11 to fix the rotor cover 14. For example, the housing body 11 has a first engaging portion 111 extending toward the control board 31, the first engaging portion 111 has an annular structure, the first engaging portion 111 is provided in the accommodating chamber 13 and the first engaging portion 111 is connected to the housing body 11, and when the rotor cover 14 is mounted, the outer periphery of the rotor cover 14 is interference-fitted with the inner peripheral wall of the first engaging portion 111 to fix the rotor cover 14 to the housing body 11, that is, the outer peripheral side of the rotor cover 14 abuts against the inner peripheral side of the first engaging portion 111. Thus, the first matching portion 111 is convenient to protect the rotor 23, avoids the influence of other systems in the accommodating cavity 13 on the rotor 23, and increases the rotation safety of the rotor 23.

In some embodiments, as shown in fig. 3 and 5, an avoidance hole 313 is formed on the control board 31, an avoidance groove 141 is formed on the rotor cover 14, the avoidance groove 141 is formed by protruding a part of the rotor cover 14 towards the direction of the control board 31, one end, adjacent to the control board 31, of the mounting protrusion 221 extends into the avoidance groove 141, and the avoidance groove 141 is matched in the avoidance hole 313. Therefore, the arrangement of the avoidance groove 141 can facilitate the arrangement of the installation protrusions 221, interference of the rotor cover 14 to the installation protrusions 221 is avoided, meanwhile, in order to facilitate the installation of the rotor cover 14 to the control panel 31, the avoidance holes 313 formed in the control panel 31 can be matched with the avoidance groove 141, so that the installation compactness between the rotor cover 14 and the control panel 31 is better, and the utilization of the internal space of the accommodating cavity 13 is increased.

In some embodiments, as shown in fig. 6, a plurality of heat-melting columns 112 are disposed in the housing body 11 at intervals along the circumferential direction of the rotating shaft 22, and the control board 31 is connected to the housing body 11 by heat-melting through the plurality of heat-melting columns 112. A plurality of heat stake posts 112 may be disposed at intervals along the outer peripheral side of the rotor cover 14, and the heat stake posts 112 may be melted by heat to achieve a fixed connection with the control board 31. Thus, the provision of the heat stake posts 112 facilitates the mounting of the control board 31 with the housing body 11.

Alternatively, as shown in fig. 6, at least one guide post 113 is provided in the case body 11, the guide post 113 is provided adjacent to the hot melt post 112, at least one guide hole is formed in the control board 31, and the guide post 113 is fitted in the guide hole. One end of the guide post 113 is connected with the housing body 11, the other end of the guide post 113 extends toward one end of the cover body 12 along the thickness direction of the control board 31, when the control board 31 is mounted with the housing body 11, the guide post 113 cooperates with the guide hole to realize the mounting and pre-positioning of the control board 31, and the hot-melt post 112 realizes the fixation of the control board 31. Therefore, the arrangement of the guide posts 113 and the guide holes facilitates the accurate installation of the control board 31, and improves the installation efficiency of the control board 31.

In some embodiments, as shown in fig. 3 and 6, the open side of the housing body 11 adjacent to the cover 12 is formed with a glue-pouring groove 114, the glue-pouring groove 114 extends along the circumferential direction of the housing body 11, the edge of the cover 12 is fitted at the glue-pouring groove 114, and glue is poured into the glue-pouring groove 114 to realize connection between the cover 12 and the housing body 11. For example, a first extension section and a second extension section are disposed on the surface of the open side of the housing body 11, the first extension section is disposed on the side of the second extension section away from the center of the housing body 11, the outer peripheral side of the first extension section is flush with the outer peripheral side of the housing body 11, the inner peripheral side of the second extension section is flush with the inner peripheral wall of the accommodating cavity 13, the first extension section and the second extension section are disposed at intervals, the first extension section and the second extension section define the glue filling groove 114, the control board 31 abuts against the second extension section, and the fixed connection and sealing between the cover 12 and the housing body 11 are realized in the glue filling groove 114. Alternatively, the glue-pouring groove 114 is defined by the housing body 11 and the outer peripheral side of the control board 31 together. Therefore, the glue filling groove 114 can facilitate the connection between the cover 12 and the housing body 11, and the tightness of the connection between the cover 12 and the housing body 11 is improved.

In some embodiments, as shown in fig. 6, a plurality of glue-pouring slot reinforcing ribs 1141 are disposed in the glue-pouring slot 114 at intervals along the circumferential direction of the housing body 11, and the plurality of glue-pouring slot reinforcing ribs 1141 may be disposed at intervals along the length direction of the glue-pouring slot 114. Therefore, the plurality of glue-pouring groove reinforcing ribs 1141 arranged in the glue-pouring groove 114 can improve the structural strength of the glue-pouring groove 114.

In some embodiments, referring to fig. 6, a plurality of case reinforcing ribs 115 are provided on the inner peripheral wall of the case body 11 at intervals in the circumferential direction of the case body 11, and the case reinforcing ribs 115 gradually increase in cross-sectional area in the thickness direction of the control plate 31 toward the direction of the cover 12. Thus, the provision of the case reinforcing ribs 115 can increase the structural strength of the case 10, and increase the ability of the load sensor 100 to resist deformation by external force.

In some embodiments, as shown in fig. 7, at least one mounting error preventing post 121 is provided on a side surface of the cover 12 facing the housing body 11. Therefore, the installation of the error-proof column 121 can facilitate the rapid installation of the cover 12 and the shell body 11, avoid damage to the control panel 31 caused by the extrusion of the control panel 31 due to incorrect installation of the cover 12, and increase protection to the control panel 31.

In some embodiments, the rotor 23 is opposite the control plate 31 and is spaced apart from each other, the distance between the rotor 23 and the control plate 31 being L, wherein L satisfies: l is more than or equal to 1.5mm and less than or equal to 2.5mm. Thereby, the space between the rotor 23 and the control board 31 is defined so as to provide the transmitting coil 311 and the receiving coil 312 on the control board 31, so that the rotor 23 can rotate in the exciting magnetic field formed by the transmitting coil 311 and generate the magnetic field with opposite magnetic field directions to reduce the magnetic flux density at the receiving coil 312, to facilitate the rotation of the rotor 23, and to increase the protection of the transmitting coil 311 and the receiving coil 312 and the like provided on the control board 31.

In some embodiments, in conjunction with fig. 2 and 5, the swing arm 21 includes: swing arm sheath 211, swing arm body 212, swing arm sheath 211 is established on casing 10 with the swing arm sheath 211 can swing, is formed with holding tank 2111 on the swing arm sheath 211, and holding tank 2111 forms the one end of keeping away from rotor 23 at swing arm sheath 211, and the one end of swing arm body 212 cooperates in holding tank 2111, and the other end of swing arm body 212 stretches out holding tank 2111 outward, and pivot 22 is established at the aforesaid one end of swing arm body 212. That is, the rotating shaft 22 is fitted in the swing arm sheath 211 and penetrates through the swing arm sheath 211, one end of the rotating shaft 22 away from the rotor 23 is connected with the swing arm body 212, and one end of the rotating shaft 22 away from the rotor 23 connects the swing arm body 212 with the rotating shaft 22 through the fastener 222. One end of the swing arm sheath 211, which is far away from the swing arm body 212 along the central axis direction of the rotating shaft 22, is in running fit with the housing body 11. When the other end of the swing arm body 212 receives an external force, the swing arm body 212, the swing arm cover 211, the rotation shaft 22 and the rotor 23 rotate together with respect to the housing 10.

Thus, the accommodating groove 2111 can facilitate the installation of the swing arm body 212, and limit to the swing arm body 212 is formed in the circumferential direction of the rotating shaft 22, so that the swing arm body 212 and the swing arm sheath 211 rotate simultaneously, thereby facilitating the high precision of the rotation angle of the rotor 23 and increasing the reliability and sensitivity of the result of the load sensor 100.

Further, as shown in fig. 1 and 5, the swing arm cover 211 includes: sheath body 2112, sheath sidewall 2113, sheath body 2112 is swingably provided on housing 10, sheath sidewall 2113 is connected at the edge of sheath body 2112, sheath sidewall 2113 extends towards the direction away from housing 10, accommodation groove 2111 is jointly defined between sheath sidewall 2113 and sheath body 2112, the both circumferential ends of sheath sidewall 2113 are spaced apart from each other to define opening 2114, the other end of swing arm body 212, i.e. the end away from housing 10, extends from opening 2114, and swing arm body 212 is connected with sheath body 2112 by at least one connecting piece. Sheath body 2112 and casing 10 normal running fit, sheath body 2112 is kept away from the one side border of casing 10 and is equipped with sheath lateral wall 2113, and sheath lateral wall 2113 extends towards the direction of keeping away from casing 10, and holding tank 2111 is injectd to sheath lateral wall 2113 and sheath body 2112, and the installation of swing arm body 212 of being convenient for is opened to one side of holding tank 2111 to make one end of swing arm body 212 stretch into in holding tank 2111 realize being connected with swing arm sheath 211 through the connecting piece, reduce the volume of swing arm body 212 and swing arm sheath 211 in pivot 22 central axis direction.

From this, sheath body 2112 and sheath lateral wall 2113's setting can be convenient for define holding tank 2111, and the installation of swing arm body 212 of being convenient for realizes the spacing to swing arm body 212 on swing arm body 212 width direction, further guarantees that swing arm body 212 and swing arm sheath 211 keep synchronous rotation, increases the support of swing arm sheath 211 to swing arm body 212, increases the structural strength of the connection of swing arm body 212 and swing arm sheath 211.

In some embodiments, as shown in fig. 3 and 5, a through hole 119 is formed on the housing 10, the rotating shaft 22 is penetrated at the through hole 119, a groove 116 is formed on the housing 10, the groove 116 surrounds the outer peripheral side of the rotating shaft 22, an extension portion 2115 extending toward the housing 10 is provided on the swing arm cover 211, and the extension portion 2115 is rotatably fitted in the groove 116. For example, a through hole 119 is formed at one end of the housing 10 adjacent to the swing arm 21, and penetrates the housing 10 in the direction of the central axis of the rotation shaft 22, the rotation shaft 22 being fitted at the through hole 119. The open end of the casing 10 far away from the casing 10 along the direction of the central axis of the rotating shaft 22 is provided with a groove 116, the groove 116 extends along the circumferential direction of the casing 10, one end of the swing arm sheath 211 adjacent to the casing 10 is provided with an extension portion 2115, the extension portion 2115 and the sheath side wall 2113 are formed with a step portion, and when the extension portion 2115 is matched in the groove 116, the casing 10 and the step portion are arranged at intervals, so that the swing arm sheath 211 rotates relative to the casing 10. Thus, the arrangement of the groove 116 and the extension portion 2115 can facilitate the swing arm sheath 211 to cooperate with the housing 10 to realize the rotation of the swing arm sheath 211 relative to the housing 10, and can increase the tightness of the installation of the swing arm sheath 211 and the housing 10.

Optionally, referring to fig. 3, a sealing ring 117 is provided between the groove 116 and the extension 2115. Therefore, the sealing ring 117 is arranged in the groove 116, so that the swing arm sheath 211 is stopped by the sealing ring 117 with the shell 10, abnormal sound or abrasion and the like caused by the stopping of the swing arm sheath 211 with the shell 10 are avoided, and the tightness between the swing arm sheath 211 and the shell 10 can be further increased.

In some embodiments, as shown in fig. 3 and 5, a second matching portion 118 is provided on a side wall of the through hole 119, the rotating shaft 22 is disposed at the second matching portion 118 in a penetrating manner, and the bearing 15 is disposed at the rotating shaft 22 and the second matching portion 118. That is, the casing 10 is provided with a through hole 119 at one end far from the opening, the rotation shaft 22 is fitted in the through hole 119, the bearing 15 is fitted in the bearing mounting groove provided on the inner peripheral surface of the first fitting portion 111, the rotation shaft 22 passes through the second fitting portion 118 from one side of the accommodating chamber 13 to be fitted with the bearing 15, and the rotation shaft 22 can rotate relative to the second fitting portion 118 through the bearing 15. Thus, the arrangement of the second fitting portion 118 facilitates the installation of the bearing 15 and the formation of the through hole 119, so that the rotating shaft 22 rotates relative to the housing 10 with a simple structure, and cost is saved.

In some embodiments, as shown in fig. 3 and 5, a matching groove 161 is formed on the rotating shaft 22, the matching groove 161 is located on one side of the bearing 15 away from the rotor 23, and a clamping spring 16 is arranged in the matching groove 161, and the clamping spring 16 is abutted against the bearing 15. The part of the rotating shaft 22, which is far away from the rotor 23, of the second matching part 118 is provided with a matching groove 161, the matching groove 161 is arranged on the outer peripheral surface of the rotating shaft 22, and the matching groove 161 is positioned above the bearing 15 and used for installing the clamp spring 16, so that the clamp spring 16 can limit the rotating shaft 22 in the central axis direction of the rotating shaft 22 after the rotating shaft 22 and the bearing 15 are assembled, the rotating shaft 22 is prevented from falling into the accommodating cavity 13 from falling out of the bearing 15, and the installation reliability of the rotating shaft 22 is improved.

In some embodiments, referring to fig. 3, the load sensor 100 further includes: and a seal 24, wherein the seal 24 is arranged between the inner peripheral wall of the through hole 119 and the outer peripheral surface of the rotating shaft 22, and the seal 24 is positioned on one side of the clamp spring 16 away from the bearing 15. The sealing element 24 is arranged above the through hole 119, and after the rotating shaft 22, the bearing 15 and the shell body 11 are installed, the sealing element 24 is sleeved on the outer peripheral surface of the part of the rotating shaft 22 above the through hole 119, and the sealing element 24 is used for forming a seal for the through hole 119 so as to prevent water and gas from entering the accommodating cavity 13 from the through hole 119 and increase the tightness of the accommodating cavity 13.

In some embodiments, as shown in fig. 3, the rotating shaft 22 has a step 223, the swing arm 21 is sleeved outside the rotating shaft 22 and supported on the step 223, the rotating shaft 22 is provided with a fastener 222 to fix the swing arm 21 and the rotating shaft 22, and the fastener 222 is located at a side of the swing arm 21 away from the step 223. The step portion 223 is located on the rotating shaft 22 and is disposed on a portion of the outer peripheral surface of the rotating shaft 22 away from the rotor 23 along the sealing member 24, and the step portion 223 is used for being matched with the swing arm 21 so as to enable the swing arm 21 and the rotating shaft 22 to be fixedly connected and rotated together. Thus, the step 223 facilitates the installation of the swing arm 21 and the rotation shaft 22, and improves the reliability of the installation of the swing arm 21.

In some embodiments, referring to fig. 3, a side of the housing 10 remote from the swing arm assembly 20 is provided with a mounting bracket 17, and the housing 10 may be secured to the mounting bracket 17 by a connector. Thus, the mounting bracket 17 can facilitate the mounting of the housing 10 to mount the load sensor 100 at different positions, increasing the convenience of mounting the load sensor 100.

Specifically, with reference to fig. 5, the mounting bracket 17 includes: the first bracket 171 and the second bracket 172, the first bracket 171 is connected to a side of the housing 10 away from the swing arm assembly 20, one end of the second bracket 172 is connected to the first bracket 171, and the other end of the second bracket 172 extends in a direction away from the swing arm assembly 20. The first bracket portion 171 and the second bracket portion 172 are provided in an L-shape, the first bracket portion 171 is for mounting the housing 10, and the second bracket portion 172 extends in a direction away from the housing 10 on one side of the first bracket portion 171. The first bracket 171 has heat dissipation holes, and the cover 12 faces the heat dissipation holes to dissipate heat from the control board 31. Thus, the two bracket portions included in the mounting bracket 17 can facilitate the mounting of the housing 10, increasing the convenience of the mounting of the housing 10.

In some embodiments, as shown in fig. 5, the load sensor 100 further includes: and a link 40, the link 40 being rotatably connected to an end of the swing arm assembly remote from the housing 10. The end of the connecting rod 40 far away from the swing arm 21 receives the transmitted force, the force is transmitted to the swing arm 21 through the connecting rod 40, the connecting rod 40 can rotate relative to the swing arm 21 under the action of the force, and the swing arm 21 and the rotor 23 are driven to rotate so as to change the magnetic field formed by the transmitting coil 311. Thus, the arrangement of the link 40 may facilitate connection of the load sensor 100 to other systems of the vehicle, such as when the load sensor 100 is connected between the frame and the axle, as the frame is displaced relative to the axle movement, a measurement is made to obtain the load on the frame.

In some embodiments, as shown in fig. 5, the end of the link 40 connected to the swing arm assembly 20 is formed with a first receiving hole 41, and the load sensor 100 further includes: the first swing arm ball 42, the first swing arm ball 42 includes a first ball portion 421 and a first connection portion 422 connected to each other, the first ball portion 421 is rotatably fitted in the first accommodation hole 41, and the first connection portion 422 is connected to the swing arm 21. That is, when the connecting rod 40 is connected with the swing arm 21, one end of the connecting rod 40 is provided with a first accommodating hole 41, the other end of the swing arm 21 is provided with a first ball head 421 and a first connecting portion 422, one end of the first connecting portion 422 is connected with the first ball head 421, the other end of the first connecting portion 422 is connected with the swing arm 21 through a connecting piece, and the first ball head and the first accommodating hole 41 can rotate in multiple directions. Therefore, the swing arm 21 and the connecting rod 40 are matched through the first ball head and the first accommodating hole 41 to realize rotation, so that the connecting rod 40 can conveniently rotate relative to the swing arm 21, force can be effectively transmitted to the swing arm 21 through the connecting rod 40 when the vehicle vibrates, and the possibility of abrasion caused by hard contact between the connecting rod 40 and the swing arm 21 is avoided.

In some embodiments, as shown in fig. 5, an end of the link 40 remote from the swing arm assembly 20 is formed with a second receiving hole 43, and the load sensor 100 further includes: the second swing arm ball 44, the second swing arm ball 44 includes a second ball portion 441 and a second connection portion 442 connected to each other, and the second ball portion 441 is rotatably fitted in the second accommodation hole 43. That is, when the connecting rod 40 is connected with other systems of the vehicle, the other end of the connecting rod 40 is provided with the second accommodating hole 43, one end of the second connecting portion 442 is connected with the second ball portion 441, the other end of the second connecting portion 442 is connected with the swing arm 21 through a connecting piece, and the second ball and the second accommodating hole 43 can rotate in multiple directions. The second receiving hole 43 may be a through hole 119 so that the second swing arm ball 44 can be mounted to the second receiving hole 43 at the other side of the second receiving hole 43 to perform a relative rotation. Therefore, the second accommodating hole 43 and the second ball head are arranged to facilitate the connection of the other end of the connecting rod 40 with other systems of the vehicle, the protection of the connecting rod 40 and the swing arm 21 can be formed when the other systems rotate around the vehicle at a plurality of angles, and the service life of the connecting rod 40 is prolonged.

In some embodiments, the link 40 is a flexible link that can facilitate connection with the first swing arm ball 42 and the second swing arm ball 44, avoiding hard contact between the link 40 and the swing arm 21 ball, reducing wear. For example, the flexible connecting rod material includes but is not limited to TPE, TPU rubber and other flexible materials. The connecting rod 40 may also be a metal piece.

In some embodiments, as shown in fig. 9 and 10, the receiving coil 312 includes a first receiving coil 3121 and a second receiving coil 3122 connected to each other, the transmitting coil 311 and the first receiving coil 3121 are located at one side of the control board 31, the second receiving coil 3122 is located at the other side of the control board 31, eddy currents are induced in the surface of the rotor 23 in the exciting magnetic field, the eddy currents form a reverse magnetic field opposite to the exciting magnetic field, and the reverse magnetic field changes induced electromotive forces of the first receiving coil 3121 and the second receiving coil 3122 to influence output voltages of the first receiving coil 3121 and the second receiving coil 3122. Thus, the first receiving coil 3121 and the second receiving coil 3122 are disposed at both sides of the control board 31, facilitating a miniaturized design of the control board 31, and reducing the volume of the load sensor 100 using the control board 31.

Specifically, with reference to fig. 10, the first receiving coil 3121 includes a plurality of first coil segments 315, the plurality of first coil segments 315 being arranged at intervals along a circumferential direction of the rotation axis 22 of the rotor 23, the plurality of first coil segments 315 being offset from the radial direction of the rotation axis 22 of the rotor 23 in a first direction a, i.e., clockwise in fig. 9, from inside to outside; the second receiving coil 3122 includes a plurality of second coil sections 316, the plurality of second coil sections 316 being arranged at intervals along the circumferential direction of the rotation axis 22 of the rotor 23, one end of the second coil section 316 being connected to one end of the first coil section 315, the other end of the second coil section 316 being connected to the other end of the other first coil section 315, the plurality of second coil sections 316 being offset from the radial direction of the rotation axis 22 of the rotor 23 in a second direction B, i.e., a counterclockwise direction in fig. 9, the second direction B being opposite to the first direction a.

In some embodiments, as shown in fig. 9, the transmitting coil 311 is located on the outer peripheral side of the first receiving coil 3121 and the second receiving coil 3122. The coverage area of the transmitting coil 311 is larger than that of the first receiving coil 3121 and the second receiving coil 3122, so that the first receiving coil 3121 and the second receiving coil 3122 are both positioned in the exciting magnetic field formed by the transmitting coil 311, so that the variation of the induced electromotive force generated by the first receiving coil 3121 and the second receiving coil 3122 under the influence of the rotor 23 is more accurate, which is helpful for improving the measurement accuracy of the load sensor 100.

In some embodiments, referring to fig. 3 and 8, the transmitting coil 311, the first receiving coil 3121, and the second receiving coil 3122 are arranged coaxially with the rotor 23. Moreover, the diameter of the rotor 23 is larger than the diameter of the circular magnetic field area formed by the transmitting coil 311 and the receiving coil 312, when the transmitting coil 311 forms an exciting magnetic field, the rotor 23 can completely cut the exciting magnetic field to form a reverse magnetic field opposite to the direction of the magnetic field generated by the transmitting coil 311, so that the magnetic flux density at the receiving coil 312 with changed reverse magnetic field coverage area is reduced, and the induced electromotive forces of the first receiving coil 3121 and the second receiving coil 3122 are changed, thereby affecting the output voltages of the two induction coils.

Specifically, the transmitting coil 311 may generate an alternating exciting magnetic field, a corresponding induced electromotive force is generated in the receiving coil 312 in the alternating exciting magnetic field, the rotor 23 may induce eddy currents on the surface thereof in the varying magnetic field, the direction of the magnetic field formed by the eddy currents is opposite to that of the exciting magnetic field, and the magnetic flux density at the receiving coil 312 covered by the rotor 23 is reduced under the action of the reverse magnetic field on the rotor 23.

In some embodiments, the orthographic projections of the transmitting coil 311, the first receiving coil 3121, and the second receiving coil 3122 on the rotor 23 are located within the edge of the rotor 23.

Referring to fig. 9-11, the receiving coil 312 includes a first receiving coil 3121 and a second receiving coil 3122, and the magnetic flux density at the receiving coil 312 is reduced, so that the induced electromotive forces of the first receiving coil 3121 and the second receiving coil 3122 are changed, thereby affecting the output voltage of the receiving coil 312. The voltage output by the induction coil changes when the rotor 23 is at different positions, meanwhile, the sensor chip 314 synchronously demodulates and filters the voltage signal generated by the output voltage of the receiving coil to obtain a processed sine voltage signal Vsin and a processed cosine voltage signal Vcos, the sensor chip 314 performs arctangent analysis on the processed Vsin and Vcos to generate a voltage signal and sends the voltage signal to the control board 31, and the control board 31 detects and analyzes and calculates the obtained voltage signal to obtain the rotated angle of the swing arm 21; the control board 31 converts the angle information of the swing arm 21 into a PWM signal and outputs the PWM signal to the MCU (Microcontroller Unit: micro control unit), and the micro control unit further converts, analyzes and processes the angle information to obtain the load information of the vehicle. The PWM (pulse width modulation: pulse width modulation) is an analog control mode, and the bias of the base electrode of a transistor or the grid electrode of a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor: metal-Oxide semiconductor field effect transistor) is modulated according to the change of the corresponding load, so that the change of the on time of the transistor or the MOS is realized, and the change of the output of the switching regulated power supply is realized. This way the output voltage of the power supply can be kept constant when the operating conditions change.

The voltage output signal of the receiving coil 312 is shown in the following table:

angle/°	0	22.5	45	67.5	90	112.5	135	157.5	180
										sin+	2.5	4	2.5	1	2.5	4	2.5	1	2.5
cos+	4	2.5	1	2.5	4	2.5	1	2.5	4
										sin-	2.5	1	2.5	4	2.5	1	2.5	4	2.5
cos-	1	2.5	4	2.5	1	2.5	4	2.5	1
										Angle of	202.5	225	247.5	270	292.5	315	337.5	360
sin+	4	2.5	1	2.5	4	2.5	1	2.5
										cos+	2.5	1	2.5	4	2.5	1	2.5	4
sin-	1	2.5	4	2.5	1	2.5	4	2.5
										cos-	2.5	4	2.5	1	2.5	4	2.5	1

For example, when the positive and negative values of the output sine voltage signal are both 2.5 and the positive value of the cosine voltage signal is 1 and the negative value is 4, the rotor rotates by an angle of 45 °.

In the present embodiment, the transmitting coil 311 and the receiving coil 312 are printed on the control board 31, typically in the form of copper tracks, wherein the first receiving coil 3121 and the second receiving coil 3122 are in a sine wave shape and are offset from each other by 90 ° on the control board 31. When the rotor 23 rotates relative to the control board 31 and the sensor chip 314 is powered on to drive the transmitting coil 311 to generate an exciting magnetic field, the rotor 23 cuts the exciting magnetic field due to the rotation of the rotor 23, so that the first receiving coil 3121 and the second receiving coil 3122 generate two coil voltages, the load sensor 100 demodulates and processes the two coil voltages from the receiver coil, the two coil voltages are output to the sensor chip 314, the sensor chip 314 is used for synchronously demodulating and filtering the two coil voltages to obtain a sine voltage signal and a cosine voltage signal, the sensor chip 314 receives the sine voltage signal and the cosine voltage signal, and according to the sine voltage signal and the cosine voltage signal, the sensor chip 314 synchronously demodulates the received two coil voltage signals and then transmits the two coil voltage signals to the control board 31 after filtering, the control board 31 analyzes the voltage signal to obtain the position of the rotor 31 and form a PWM signal, and the micro control unit obtains the PWM signal to analyze the load information of the corresponding position of the rotor 23. Since the first receiving coil 3121 and the second receiving coil 3122 have a phase offset of 90 °, the output signal also has a phase offset of 90 ° with respect to the target position, so that the proportional sine and cosine signals are generated representing the absolute angular position of the rotor 23.

According to an embodiment of the second aspect of the present utility model, a vehicle includes: the load sensor 100 is the load sensor 100 for a vehicle according to any one of the above embodiments, and the housing 10 of the load sensor 100 is provided on the frame, and the other end of the swing arm 21 of the load sensor 100 is provided on the axle.

Referring to fig. 1 to 11, one end of the connecting rod 40, which is far away from the housing 10, is connected to an axle, the mounting bracket 17 is fixed to a vehicle frame, the vehicle frame and the axle have a relative movement relationship through the load sensor 100, for example, the vehicle frame moves towards the axle under the action of gravity when the vehicle is loaded by a commercial vehicle, the connecting rod 40 drives the swing arm 21 to rotate, the swing arm 21 is fixedly connected with the rotating shaft 22 and the rotor 23, the rotor 23 rotates for a certain angle, the transmitting coil 311 on the control board 31 works to generate an exciting magnetic field, the magnetic field formed by the eddy current generated by the rotation of the rotor 23 is opposite to the exciting magnetic field, the magnetic field intensity of a part of the receiving coil 312 opposite to the reversing magnetic field can be reduced, the magnetic flux corresponding to the receiving coil 312 is reduced, and the angle of rotation of the rotor 23 is obtained by analyzing voltage signals output by the receiving coil 312 through the sensor chip 314 and the micro control unit, so that the angle information of the rotation of the swing arm 21 and the load information corresponding to the angle information of the swing arm 21 are obtained.

The load sensor 100 for a vehicle operates as follows:

1) The connecting rod 40 drives the rotor 23 to rotate through the swing arm 21 and the rotating shaft 22, the sensor chip 314 is powered on to drive the transmitting coil 311 to generate an exciting magnetic field, and the fan blades of the rotor 23 cut the exciting magnetic field due to the rotation of the rotor 23, so that the first receiving coil 3121 and the second receiving coil 3122 generate two coil voltages.

2) The two coil voltages are transmitted to the sensor chip 314 through the first receiving coil 3121 and the second receiving coil 3122, and the sensor chip 314 generates corresponding sine voltage signals and cosine voltage signals after synchronously demodulating and filtering the received two coil voltages;

the sine voltage signal includes a positive sine voltage signal and a negative sine voltage signal, and the cosine voltage signal includes a positive cosine voltage signal and a negative cosine voltage signal.

3) The sensor chip 314 sends the generated sine voltage signal and cosine voltage signal to the control board 31, and the control board detects the generated sine voltage signal and cosine voltage signal through the Delta SigmaAnalog-to-Digital Converter voltage detection module to obtain a sine voltage value Vsin and a cosine voltage value Vcos corresponding to the same time angle.

4) The control board 31 performs arctangent operation on the sine voltage value Vsin and the cosine voltage value Vcos to obtain the position of the rotor 23, that is, the rotation angle of the swing arm 21.

5) The angular position information of the rotor 23 is converted into a PWM signal and output to the micro control unit for further weight conversion analysis processing, and the load condition of the vehicle is obtained.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features. In the description of the present utility model, "plurality" means two or more. In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween. In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A load sensor for a vehicle, comprising:

a housing;

the swing arm assembly is movably connected with the shell, and a rotor is arranged on the swing arm assembly;

the control panel, the control panel is located in the casing, when swing arm assembly for the casing motion, swing arm assembly drives the rotor for the control panel rotates, be equipped with transmitting coil, receiving coil and controlling means on the control panel, transmitting coil is used for producing alternating excitation magnetic field, receiving coil is used for when the rotor rotates for the control panel cutting the excitation magnetic field produces the output voltage when inducing electromotive force, controlling means is suitable for with output voltage converts the load information of vehicle.

2. The load sensor for a vehicle of claim 1, wherein the swing arm assembly comprises:

the rotating shaft is movably arranged on the shell in a penetrating way, and the rotor is arranged at one end of the rotating shaft, which is positioned in the shell;

and one end of the swing arm is connected with the rotating shaft.

3. The load sensor for a vehicle according to claim 2, wherein the one end of the rotating shaft is provided with a mounting boss extending toward the control board, and the rotor is fitted over the mounting boss.

4. A load sensor for a vehicle according to claim 3, wherein the mounting boss includes a first boss portion and a second boss portion which are connected in order in a direction away from the center of the rotation shaft, the rotor is fitted over the first boss portion, a threaded fastener is provided at the second boss portion, and the rotor is held between the second boss portion and an end face of the rotation shaft which faces the control board.

5. The load sensor for a vehicle of claim 4, wherein the housing comprises:

the shell body is provided with a swing arm assembly, and one side, far away from the swing arm assembly, of the shell body is an open side;

The cover body is arranged on the open side of the shell body, the cover body and the shell body jointly define a containing cavity, and the control board is arranged in the containing cavity.

6. The load sensor for a vehicle according to claim 5, characterized by further comprising:

and the rotor cover is covered outside the rotor and is positioned between the rotor and the control board.

7. The load sensor for a vehicle according to claim 6, wherein the control plate is formed with a relief hole;

the rotor cover is provided with an avoidance groove part, the avoidance groove part is formed by protruding a part of the rotor cover towards the direction of the control panel, one end, adjacent to the control panel, of the installation protrusion extends into the avoidance groove part, and the avoidance groove part is matched in the avoidance hole.

8. The load sensor for a vehicle according to claim 7, wherein the housing body has a first fitting portion extending toward the control board therein, and an outer peripheral edge of the rotor cover is interference-fitted with an inner peripheral wall of the first fitting portion to fix the rotor cover to the housing body.

9. The load sensor for a vehicle according to claim 7, wherein a plurality of heat stake posts are provided in the housing body at intervals along a circumferential direction of the rotating shaft, and the control board is heat-staked to the housing body through the plurality of heat stake posts.

10. The load sensor for a vehicle of claim 9, wherein at least one guide post is provided within the housing body, the guide post being adjacent the hot melt post;

at least one guide hole is formed in the control panel, and the guide post is matched in the guide hole.

11. The load sensor for a vehicle according to claim 7, wherein the open side of the housing body is formed with a glue-pouring groove, and an edge of the cover body is fitted at the glue-pouring groove, and glue is poured into the glue-pouring groove to achieve connection between the cover body and the housing body.

12. The load sensor for a vehicle according to claim 11, wherein a plurality of glue-pouring groove reinforcing ribs are provided in the glue-pouring groove at intervals along the circumferential direction of the housing body.

13. The load sensor for a vehicle according to claim 7, wherein a plurality of case reinforcing ribs are provided on an inner peripheral wall of the case body at intervals in a circumferential direction of the case body.

14. The load sensor for a vehicle according to claim 7, wherein at least one mounting error preventing post is provided on a surface of the cover body on a side facing the housing body.

15. The load sensor for a vehicle according to claim 1, wherein the rotor is opposed to the control board and spaced apart from each other, a distance between the rotor and the control board being L, wherein the L satisfies: l is more than or equal to 1.5mm and less than or equal to 2.5mm.

16. The load sensor for a vehicle of claim 1, wherein the swing arm includes:

the swing arm sheath is arranged on the shell in a swinging way, and an accommodating groove is formed in the swing arm sheath;

the swing arm body, the one end of swing arm body is equipped with the pivot and cooperates in the holding tank, the other end of swing arm body stretches out outside the holding tank.

17. The load sensor for a vehicle of claim 16, wherein the swing arm sheath comprises:

the sheath body is arranged on the shell in a swinging manner;

sheath lateral wall, the sheath lateral wall is connected in the edge of sheath body, the sheath lateral wall orientation is kept away from the direction of casing extends, the sheath lateral wall with jointly inject between the sheath body the holding tank, the circumference both ends of sheath lateral wall are spaced apart from each other in order to inject the opening, the swing arm body keep away from the one end of casing stretches out from the opening part, the swing arm body pass through at least one fastener with the sheath body links to each other.

18. The load sensor for a vehicle according to claim 17, wherein a through hole is formed in the housing, the rotation shaft is penetrated at the through hole, a groove is formed in the housing, and the groove surrounds an outer peripheral side of the through hole;

the swing arm sheath is provided with an extension part extending towards the shell, and the extension part is rotatably matched in the groove.

19. A load sensor for a vehicle according to claim 18, wherein a sealing ring is provided between the groove and the extension.

20. The load sensor for a vehicle according to claim 18, wherein a second fitting portion is provided on a side wall of the through hole, the rotation shaft is provided at the second fitting portion in a penetrating manner, and a bearing is provided at the rotation shaft and the second fitting portion.

21. The load sensor for a vehicle according to claim 20, wherein a fitting groove is formed in the rotating shaft, the fitting groove is located on a side of the bearing away from the rotor, a snap spring is provided in the fitting groove, and the snap spring is stopped against the bearing.

22. The load sensor for a vehicle of claim 21, further comprising:

The sealing piece is arranged between the inner peripheral wall of the through hole and the outer peripheral surface of the rotating shaft and is positioned on one side, far away from the bearing, of the clamping spring.

23. The load sensor for a vehicle according to claim 14, wherein the rotation shaft has a stepped portion, the swing arm is sleeved outside the rotation shaft and supported on the stepped portion, a fastener is provided on the rotation shaft to fix the swing arm with the rotation shaft, and the fastener is located on a side of the swing arm away from the stepped portion.

24. The load sensor for a vehicle of claim 1, wherein a side of the housing remote from the swing arm assembly is provided with a mounting bracket.

25. The load sensor for a vehicle of claim 24, wherein the mounting bracket comprises:

the first bracket part is connected with one side of the shell, which is far away from the swing arm assembly;

and one end of the second bracket part is connected with the first bracket part, and the other end of the second bracket part extends towards a direction away from the swing arm assembly.

26. The load sensor for a vehicle according to any one of claims 1 to 25, characterized by further comprising:

And one end of the connecting rod is rotatably connected with one end, far away from the shell, of the swing arm assembly.

27. The load sensor for a vehicle according to claim 26, wherein an end of the link connected to the swing arm assembly is formed with a first receiving hole;

the load sensor for a vehicle further includes:

the first swing arm ball head comprises a first ball head part and a first connecting part which are connected with each other, the first ball head part is rotatably matched in the first accommodating hole, and the first connecting part is connected with the swing arm.

28. The load sensor for a vehicle of claim 26, wherein an end of the link remote from the swing arm assembly is formed with a second receiving hole;

the load sensor for a vehicle further includes:

the second swing arm ball head comprises a second ball head part and a second connecting part which are connected with each other, and the second ball head part is rotatably matched in the second accommodating hole.

29. The load sensor for a vehicle of claim 26, wherein the link is a flexible link.

30. The load sensor for a vehicle according to claim 1, wherein the receiving coil includes a first receiving coil and a second receiving coil connected to each other, the transmitting coil and the first receiving coil being located at one side of the control board, the second receiving coil being located at the other side of the control board,

eddy currents are induced in the surface of the rotor in the excitation magnetic field, the eddy currents forming a reverse magnetic field in a direction opposite to that of the excitation magnetic field, the reverse magnetic field changing induced electromotive forces of the first and second receiving coils to affect output voltages of the first and second receiving coils.

31. The load sensor for a vehicle of claim 30, wherein the first receiver coil comprises a plurality of first coil segments, the plurality of first coil segments being circumferentially spaced along the rotational axis of the rotor, the plurality of first coil segments being offset from radial to radial from the rotational axis of the rotor in a first direction from inside to outside;

the second receiving coil comprises a plurality of second coil sections, the second coil sections are arranged at intervals along the circumference of the rotation axis of the rotor, one end of each second coil section is connected with one end of each first coil section, the other end of each second coil section is connected with the other end of the corresponding first coil section, the second coil sections deviate from the radial direction of the rotation axis of the rotor from inside to outside along a second direction, and the second direction is opposite to the first direction.

32. The load sensor for a vehicle according to claim 31, wherein the transmitting coil is located on an outer peripheral side of the first receiving coil and the second receiving coil.

33. The load sensor for a vehicle of claim 31, wherein the transmitting coil, the first receiving coil, the second receiving coil are arranged coaxially with the rotor.

34. The load sensor for a vehicle of claim 31, wherein an orthographic projection of the transmitting coil, the first receiving coil, and the second receiving coil on the rotor is located within an edge of the rotor.

35. A vehicle, characterized by comprising:

a frame;

an axle;

load sensor for a vehicle, the load sensor being according to any one of claims 1-34, a housing of the load sensor being provided on the frame, an end of a swing arm assembly of the load sensor remote from the housing being provided on the axle.