Wheel speed sensor and automobile

Abstract

The utility model discloses a wheel speed sensor which is used for detecting the rotating speed of a gear ring, the gear ring comprises a plurality of convex teeth, and the wheel speed sensor is characterized in that a shell comprises a first induction surface, a second induction surface and an accommodating part, the first induction surface and the second induction surface are arranged at one end of the shell along a first direction, and the first induction surface and the second induction surface are arranged at an angle; the first sensor is accommodated in the accommodating part, the first sensor comprises a first chip, and the first chip corresponds to the first sensing surface; the second sensor is accommodated in the accommodating part, the second sensor comprises a second chip, and the second chip corresponds to the second sensing surface; the surface of the first chip is parallel to the first sensing surface, the surface of the second chip is parallel to the second sensing surface, and the first sensing surface and the second sensing surface are respectively parallel to the outer surfaces of the corresponding convex teeth. According to the utility model, when the gear ring rotates, the reading gaps between the first chip and the second chip and the outer surfaces of the corresponding convex teeth are kept unchanged. The utility model further provides an automobile.

Description

Technical Field

[0001] The utility model relates to the field of sensors, in particular to a wheel speed sensor and a car. Background Art

[0002] The wheel speed sensor is a sensor used to detect the wheel speed of a vehicle. It provides wheel speed information to the vehicle dynamic control system (VDC), electronic stability program (ESP), anti-lock braking system (ABS), and automatic transmission control system in the vehicle, ensuring the normal driving of the vehicle.

[0003] The wheel speed sensor generally includes a housing, a mounting surface (with through holes), a sensing surface and a chip. The wheel speed sensor is generally installed on the steering hitch and the wheel hub bearing unit in the vehicle. There are two through holes on the steering hitch of the vehicle. The housing of the wheel speed sensor is fixed through one of the through holes, and the bolt passes through the bushing and is connected to the steering hitch through the other through hole and installed and fixed in the vehicle. The installation method on the wheel hub bearing unit is similar to that on the steering hitch, except that the two are in different positions in the vehicle. In order to read the rotation of the wheel gear, the sensing surface in the wheel speed sensor is designed so that the chip inside the sensor is parallel to the sensing surface and the distance is fixed. The chip contains Hall or magnetoresistive sensing elements.

[0004] Based on the principle of Hall or magnetoresistance effect, when the gear rotates and the convex teeth and missing teeth on the gear alternately approach the sensor head (the part where the chip is placed), the magnetic field strength in the closed circuit where the sensor is located changes. By sensing the change in magnetic field strength, the chip outputs a fixed-regular current waveform signal after algorithm processing. The signal is transmitted to the automotive electronic control unit (ECU) through the chip pins and wiring harness. After receiving the current signal, the electronic control unit (ECU) calculates the speed of the wheel based on the frequency of the signal, thereby displaying the speed in real time on the dashboard.

[0005] According to different vehicle space layouts, wheel speed sensors are divided into two reading modes: side reading and top reading by distinguishing the different positional relationships of the sensing surface on the sensor head. Among them, the sensing surface of the sensor is at the front end of the sensor head for top reading, and the sensing surface of the sensor is at the side of the sensor head for side reading. At present, whether the wheel speed sensor is a side reading mode or a top reading mode, whether it is a single chip configuration or a dual chip configuration, the chip is parallel to the sensing surface and the chips are on the same horizontal plane. This application is explained in terms of the top reading mode.

[0006] In order to cooperate with autonomous driving and measure speed more accurately, wheel speed sensors generally adopt a dual-chip configuration. When installing the chips, the two chips in the dual-chip configuration are parallel to the sensing surface, the two chips are parallel to each other and are on the same horizontal plane, and the two sensing surfaces are also parallel to each other and are on the same horizontal plane. For top-reading dual-chip sensors, during the rotation of the gears, the chip surface cannot always remain parallel to the ring gear. At this time, the reading gap between the chip and the ring gear will become larger, resulting in an air gap error, that is, the reading gap exceeds the specified value, which can easily cause risks such as loss of wheel speed information. Utility Model Content

[0007] The purpose of the utility model is to solve the problem that the chip cannot be kept parallel to the gear ring at all times during the gear rotation process, resulting in an air gap error and inaccurate signal reading. The utility model provides a wheel speed sensor that can ensure that the reading gaps of two chips are the same.

[0008] In order to solve the above technical problems, the embodiment of the utility model discloses a wheel speed sensor for detecting the rotation speed of a ring gear, wherein the ring gear includes a plurality of convex teeth, including:

[0009] A housing, comprising a first sensing surface, a second sensing surface and a receiving portion, wherein the first sensing surface and the second sensing surface are arranged at one end of the housing along a first direction, the first sensing surface and the second sensing surface are arranged at an angle, the first sensing surface and the second sensing surface are connected along a circumferential direction, and the receiving portion extends along the first direction;

[0010] A first sensor, contained in the containing portion, wherein the first sensor comprises a first chip, and the first chip corresponds to the first sensing surface;

[0011] A second sensor is contained in the containing portion, wherein the second sensor comprises a second chip, and the second chip corresponds to the second sensing surface; wherein:

[0012] The first chip surface is parallel to the first sensing surface, the second chip surface is parallel to the second sensing surface, the first sensing surface and the second sensing surface are respectively parallel to the outer surfaces of the corresponding protruding teeth, and the circumference surrounds the first direction.

[0013] Compared with the prior art, the two chips in the dual-chip configuration are parallel to the sensing surface, the two chips are parallel to each other and are in the same horizontal plane, and the two sensing surfaces are also parallel to each other and are in the same horizontal plane. For example, when one chip is parallel to the ring gear and the distance from the outer surface of the ring gear is 3mm, when the ring gear rotates, the distance between the other chip and the outer surface of the ring gear may be 5mm. At this time, the reading gap of 5mm is too large and exceeds the specified value of 3mm, and an air gap error will occur, which may easily cause the risk of wheel speed information loss.

[0014] In the present technical solution, the housing of the wheel speed sensor includes a first sensing surface and a second sensing surface, the surface of the first chip is parallel to the first sensing surface, the surface of the second chip is parallel to the second sensing surface, the first sensing surface and the second sensing surface are respectively parallel to the outer surfaces of the corresponding convex teeth, the first sensing surface and the second sensing surface are arranged at an angle, that is, the first chip and the second chip are arranged at an angle, and the first chip and the second chip are not in the same plane. At this time, the first chip and the second chip are respectively parallel to the outer surfaces of the corresponding convex teeth and the distance is fixed. When the ring gear rotates, the first chip and the second chip can always remain parallel to the outer surfaces of the corresponding convex teeth and the distance is fixed, that is, the reading gap between the first chip and the second chip and the outer surface of the corresponding convex teeth remains unchanged, avoiding the problem of inaccurate signal reading due to excessive air gap, and ensuring the stable output of wheel speed information.

[0015] According to another specific embodiment of the present utility model, the center line of the first sensing surface and the center line of the second sensing surface are respectively parallel to the line connecting the center of the corresponding tooth bulge and the center of the gear ring, or the center line of the first sensing surface and the center line of the second sensing surface respectively coincide with the line connecting the center of the corresponding tooth bulge and the center of the gear ring.

[0016] By adopting the above technical solution, it can be ensured that the first sensing surface and the second sensing surface are respectively parallel to the outer surfaces of the corresponding tooth protrusions, so that the distance between the first sensing surface and the second sensing surface and the outer surfaces of the corresponding tooth protrusions remains unchanged, thereby ensuring smooth detection of the ring gear rotation signal.

[0017] According to another specific embodiment of the present invention, the angle between the center lines of the first chip and the second chip is a first angle α1, and the angle between the center lines of two adjacent protruding teeth is a second angle α2, wherein α1=α2, α2=360° / number of protruding teeth.

[0018] Using the above technical solution, for example, if the gear ring used has 48 teeth, that is, the gear ring includes 48 convex teeth and 48 missing teeth, the circumference is 360°, that is, the angle between the center lines of two adjacent convex teeth, the second angle α2 = 360° / 48 = 7.5°, so the angle between the center lines of the first chip and the second chip, the first angle α1 is 7.5°. This arrangement can ensure that the surface of the first chip and the surface of the second chip are respectively parallel to the outer surface of the corresponding convex teeth, and during the rotation of the gear ring, the first chip and the second chip can always remain parallel to the outer surface of the corresponding convex teeth and the distance is fixed, that is, the reading gap between the first chip and the second chip and the outer surface of the corresponding convex teeth remains unchanged, avoiding the problem of inaccurate signal reading due to excessive air gap, and ensuring the stable output of wheel speed information.

[0019] According to another specific embodiment of the present utility model, the wheel speed sensor includes:

[0020] a first frame, the first frame having a first chip accommodating portion and a first positioning structure, the first chip being fixed in the first chip accommodating portion, the first positioning structure being inserted into a first through hole of the housing, the first through hole extending through the housing along a second direction, the second direction being perpendicular to the first direction;

[0021] The second skeleton has a second chip accommodating portion and a second positioning structure, the second chip is fixed in the second chip accommodating portion, and the second positioning structure is inserted into the first through hole of the housing.

[0022] According to another specific embodiment of the utility model, the first skeleton also includes a plurality of first limiting structures, and the plurality of first limiting structures are protruding from one end of the first skeleton along a third direction, and along the second direction, the plurality of first limiting structures are spaced apart to form a first chip pin placement groove, and the first sensor also includes a first chip pin, and the first chip pin is connected to the first chip, and the first chip pin is placed in the corresponding first chip pin placement groove, and the first chip pin is spaced apart from the corresponding first chip pin placement groove, and the third direction is perpendicular to the second direction.

[0023] By adopting the above technical solution, during the operation of the wheel speed sensor, if adjacent first chip pins are overlapped, the first chip will be short-circuited. At this time, the first limiting structure is arranged at intervals to form first chip pin placement grooves, and the first chip pins are placed in corresponding first chip pin placement grooves, which can effectively avoid the first chip short circuit caused by the contact of adjacent first chip pins.

[0024] According to another specific embodiment of the utility model, the second skeleton also includes a plurality of second limiting structures, which are protruding from one end of the second skeleton along a third direction, and along the second direction, the plurality of second limiting structures are spaced apart to form a second chip pin placement groove, the second sensor also includes a second chip pin, the second chip pin is connected to the second chip, the second chip pin is placed in the corresponding second chip pin placement groove, and the second chip pin is spaced apart from the corresponding second chip pin placement groove, and the third direction is perpendicular to the second direction.

[0025] By adopting the above technical solution, during the operation of the wheel speed sensor, if adjacent second chip pins overlap, the second chip will be short-circuited. At this time, the second limiting structure is arranged at intervals to form second chip pin placement grooves, and the second chip pins are placed in corresponding second chip pin placement grooves, which can effectively avoid the second chip short circuit caused by the contact of adjacent second chip pins.

[0026] According to another specific embodiment of the utility model, the first chip accommodating portion includes a plurality of first chip holding structures, a portion of the plurality of first chip holding structures are arranged at intervals along the second direction, another portion of the plurality of first chip holding structures are arranged at intervals along the third direction, and the plurality of first chip holding structures are used to fix the first chip.

[0027] By adopting the above technical solution, when the first chip is placed in the first chip receiving portion, it is fixed by a plurality of first chip holding structures, thereby providing positioning and support for the first chip and ensuring the stability of the installation of the first chip.

[0028] According to another specific embodiment of the present utility model, the second chip accommodating portion includes a plurality of second chip holding structures, a portion of the plurality of second chip holding structures are arranged at intervals along the second direction, another portion of the plurality of second chip holding structures are arranged at intervals along the third direction, and the plurality of second chip holding structures are used to fix the second chip.

[0029] By adopting the above technical solution, when the second chip is placed in the second chip receiving portion, it is fixed by a plurality of second chip holding structures, thereby providing positioning and support for the second chip and ensuring the stability of the second chip installation.

[0030] According to another specific embodiment of the utility model, the housing is provided with a mounting portion protruding along the third direction, the mounting portion has a second through hole, the second through hole extends through the mounting portion along the first direction, and the wheel speed sensor is connected to the external structure through the mounting portion.

[0031] The embodiment of the utility model further discloses a car, which comprises:

[0032] A gear ring including a plurality of convex teeth;

[0033] In any of the above-mentioned wheel speed sensors, the first sensing surface and the second sensing surface of the wheel speed sensor are respectively parallel to the outer surfaces of the corresponding convex teeth.

[0034] According to another specific embodiment of the present utility model, the automobile further comprises a bushing, and the bushing is embedded in the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The assembly of a wheel speed sensor and a gear ring according to an embodiment of the utility model is shown. Figure 1 .

[0036] Figure 2a FIG2 shows an assembly diagram of a wheel speed sensor and a ring gear according to an embodiment of the present utility model.

[0037] Figure 2b Show the utility model embodiment Figure 2a A partial enlarged view of area A.

[0038] Figure 3a A three-dimensional diagram of a wheel speed sensor in an embodiment of the present utility model is shown.

[0039] Figure 3b The internal structure diagram of a wheel speed sensor according to an embodiment of the utility model is shown.

[0040] Figure 4a FIG3 shows the assembly of a wheel speed sensor and a ring gear according to an embodiment of the utility model.

[0041] Figure 4b Show the utility model embodiment Figure 4a A partial enlarged view of area B in the middle.

[0042] Figure 5 A stereoscopic view of the first sensor, the second sensor and the ring gear according to an embodiment of the utility model is shown.

[0043] Figure 6a Show the utility model embodiment Figure 5 A partial enlarged view of the middle C area.

[0044] Figure 6b Show the utility model embodiment Figure 5 Schematic diagram of region C in the middle.

[0045] Figure 7 A cross-sectional view of a wheel speed sensor and a gear ring according to an embodiment of the utility model is shown.

[0046] Figure 8A front view of a wheel speed sensor and a ring gear according to an embodiment of the utility model is shown.

[0047] Figure 9a Show the utility model embodiment Figure 8 A partial enlarged view of the D area in the middle.

[0048] Figure 9b Show the utility model embodiment Figure 8 Schematic diagram of region D in center.

[0049] Fig.10 A stereoscopic view showing the skeleton of the utility model embodiment Figure 1 .

[0050] Fig.11a A stereoscopic view of a first sensor and a second sensor according to an embodiment of the present utility model is shown.

[0051] Fig.11b The embodiment of the utility model shows the connection mode of the first chip pin, the first plug sheet and the first plug pin, and the connection mode of the second chip pin, the second plug sheet and the second plug pin.

[0052] Fig.12 A second stereoscopic view of the skeleton of an embodiment of the utility model is shown.

[0053] Fig.13a A top view of the skeleton of an embodiment of the utility model is shown.

[0054] Fig.13b A top view of a sensor according to an embodiment of the present invention is shown.

[0055] Description of Reference Numerals

[0056] Wheel speed sensor 2;

[0057] Housing 21; first sensing surface 211; second sensing surface 212; accommodating portion 213; first through hole 214; mounting portion 215; second through hole 2151;

[0058] A first sensor 22;

[0059] First chip 221; first chip pin 2211;

[0060] First skeleton 222; first chip receiving portion 2221; first chip holding structure 22211; first bottom wall groove 22212;

[0061] First positioning structure 2222; first limiting structure 2223; first plug pin 2224; first plug sheet 2225; first chip pin placement groove 2226; third through hole 2227;

[0062] A second sensor 23;

[0063] Second chip 231; second chip pin 2311;

[0064] Second skeleton 232; second chip receiving portion 2321; second chip holding structure 23211; second bottom wall groove 23212;

[0065] The second positioning structure 2322; the second limiting structure 2323; the second pin 2324; the second inserting piece 2325; the second chip pin placement groove 2326; the fourth through hole 2327;

[0066] Ring gear 3;

[0067] Convex teeth 31; missing teeth 32;

[0068] Bushing 4. DETAILED DESCRIPTION

[0069] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0070] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0071] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model 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 cannot be understood as a limitation on the utility model.

[0072] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0073] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0074] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0075] refer to Figure 1 The embodiment of the present application provides a wheel speed sensor 2 for detecting the rotation speed of the ring gear 3, and the ring gear 3 includes 48 convex teeth 31 and 48 missing teeth 32. It should be noted that the embodiment of the present application does not specifically limit the number of the convex teeth 31 of the ring gear 3 and the number of the missing teeth 32 of the ring gear 3. For example, in other possible implementations, the number of the convex teeth 31 and the number of the missing teeth 32 can be 32, 40, 50, or more.

[0076] like Figures 2a to 3b As shown, the wheel speed sensor 2 includes a housing 21, a first sensor 22 and a second sensor 23. The housing 21 includes a first sensing surface 211, a second sensing surface 212 and a receiving portion 213, along a first direction ( Figure 3a X direction), the first sensing surface 211 and the second sensing surface 212 are arranged at one end of the housing 21, the first sensing surface 211 and the second sensing surface 212 are arranged at an angle, and the first sensing surface 211 and the second sensing surface 212 are arranged along the circumferential direction ( Figure 3b The accommodating portion 213 is connected in the first direction (in the middle R direction), and extends along the first direction.

[0077] The first sensor 22 is accommodated in the accommodation portion 213 and includes a first chip 221 corresponding to the first sensing surface 211. The second sensor 23 is accommodated in the accommodation portion 213 and includes a second chip 231 corresponding to the second sensing surface 212.

[0078] The surface of the first chip 221 is parallel to the first sensing surface 211 , the surface of the second chip 231 is parallel to the second sensing surface 212 , the first sensing surface 211 and the second sensing surface 212 are respectively parallel to the outer surfaces of the corresponding protruding teeth 31 , and circumferentially surround the first direction.

[0079] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of sensors in the wheel speed sensor 2. For example, in other possible implementations, the number of sensors may be 3, 4, 5, or more.

[0080] Using the above technical solution, such as Figure 2b As shown, the first sensing surface 211 and the second sensing surface 212 of the wheel speed sensor 2 are at the front end of the sensor head, which is a top reading method.

[0081] like Figure 3b to Figure 4b As shown, the first sensing surface 211 and the second sensing surface 212 are parallel to the outer surface of the corresponding convex teeth 31, and the first sensing surface 211 and the second sensing surface 212 are arranged at an angle, that is, the first chip 221 and the second chip 231 are arranged at an angle, and the first chip 221 and the second chip 231 are not in the same plane; Figure 5 and Figure 6a As shown, the first chip 221 and the second chip 231 are parallel to the outer surface of the corresponding protruding teeth 31 and the distance between them is fixed. Figure 6b In FIG. 1 , the positional relationship between the first chip 221, the first sensing surface 211 and the outer surface of the corresponding protruding tooth 31; the positional relationship between the second chip 231, the second sensing surface 212 and the outer surface of the corresponding protruding tooth 31 are schematically illustrated. Figure 6b and Figure 7 It can be seen that the outer surfaces of the first chip 221, the first sensing surface 211 and the corresponding protruding teeth 31 are in one-to-one correspondence and parallel; the outer surfaces of the second chip 231, the second sensing surface 212 and the corresponding protruding teeth 31 are also in one-to-one correspondence and parallel.

[0082] When the gear ring 3 rotates, the first chip 221 and the second chip 231 can always be parallel to the outer surface of the corresponding convex tooth 31 and the distance is fixed, that is, the reading gap d (such as Figure 6b The wheel speed information is shown in the figure, which remains unchanged, thus avoiding the problem of inaccurate signal reading due to excessive air gap and ensuring the stable output of wheel speed information.

[0083] It should be noted that, in the embodiment of the present application, the explanation for the first sensing surface 211 being parallel to the outer surface of the "corresponding" convex tooth 31 is that, during the rotation of the gear ring 3, the convex tooth 31 closest to the first sensing surface 211 is the "corresponding" convex tooth 31 of the first sensing surface 211. The same explanation applies to the outer surface of the first chip 221 being parallel to the "corresponding" convex tooth 31. For example, Figure 6bIn the figure, the convex tooth 31 on the left side is closest to the first sensing surface 211 and the first chip 221, that is, the convex tooth 31 on the left side is the convex tooth 31 "corresponding" to the first sensing surface 211 and the first chip 221. The convex tooth 31 on the right side of the figure is closest to the second sensing surface 212 and the second chip 231, that is, the convex tooth 31 on the right side is the convex tooth 31 "corresponding" to the second sensing surface 212 and the second chip 231.

[0084] It should be noted that the embodiment of the present application does not impose any specific restrictions on the reading gap d between the first chip 221 and the second chip 231 and the outer surface of the convex teeth 31. For example, in other possible implementations, the reading gap d can be 1 mm, 2 mm or 4 mm, etc. The set reading gap d is determined by the number of convex teeth 31 of the gear ring 3.

[0085] In some possible implementations, such as Figure 8 , Figure 9a and Figure 9b As shown, the center line l1 of the first sensing surface 211 and the center line l2 of the second sensing surface 212 are respectively parallel to the lines l3 and l4 connecting the centers of the corresponding convex teeth 31 and the center O of the gear ring 3 .

[0086] Alternatively, in some possible implementations, the center line l1 of the first sensing surface 211 and the center line l2 of the second sensing surface 212 respectively coincide with the lines l3 and l4 connecting the centers of the corresponding convex teeth 31 and the center O of the gear ring 3 .

[0087] Adopt the above technical solution, for the convenience of understanding, Figure 9bThe figure shows that the center line l1 of the first sensing surface 211 and the center line l2 of the second sensing surface 212 are respectively parallel to the lines l3 and l4 connecting the centers of the corresponding convex teeth 31 and the center O of the gear ring 3. At this time, the first sensing surface 211 and the second sensing surface 212 can be ensured to be respectively parallel to the outer surface of the corresponding convex teeth 31. Similarly, when the center line l1 of the first sensing surface 211 and the center line l2 of the second sensing surface 212 coincide with the lines l3 and l4 connecting the centers of the corresponding convex teeth 31 and the center O of the gear ring 3, the first sensing surface 211 and the second sensing surface 212 can also be ensured to be respectively parallel to the outer surface of the corresponding convex teeth 31. At the same time, since the housing 21 is fixed on the external structure, the positions of the first sensing surface 211 and the second sensing surface 212 are also fixed. During the rotation of the gear ring 3, the first sensing surface 211 and the second sensing surface 212 remain parallel to the outer surfaces of the convex teeth 31 corresponding to them and the distance remains unchanged, so as to ensure the smooth detection of the rotation signal of the gear ring 3. Since the first chip 221 is disposed in the first chip accommodating portion 2221 and the second chip 231 is disposed in the second chip accommodating portion 2321, the specific positions and angles of the first chip 221 and the second chip 231 cannot be observed through the outer shell 21. Therefore, the first sensing surface 211 and the second sensing surface 212 are provided. From the placement positions and angles of the first sensing surface 211 and the second sensing surface 212, the specific positions and angles of the first chip 221 and the second chip 231 corresponding thereto can be known.

[0088] In some possible implementations, such as Figure 5 , Figure 6a and Figure 6b As shown, the angle between the center lines of the first chip 221 and the second chip 231 is a first angle α1, and the angle between the center lines of two adjacent protruding teeth 31 is a second angle α2, wherein α1=α2, α2=360° / number of protruding teeth.

[0089] Using the above technical solution, for example, if the gear ring 3 used has 48 teeth, that is, the gear ring 3 includes 48 convex teeth 31 and 48 missing teeth 32, the circumference is 360°, that is, the angle between the center lines of two adjacent convex teeth 31, the second angle α2 = 360° / 48 = 7.5°, so the angle between the center lines of the first chip 221 and the second chip 231, the first angle α1 is 7.5°.

[0090] This arrangement can ensure that the surface of the first chip 221 and the surface of the second chip 231 are respectively parallel to the outer surfaces of the corresponding convex teeth 31, and during the rotation of the ring gear 3, the first chip 221 and the second chip 231 can always remain parallel to the outer surfaces of the corresponding convex teeth 31 and the distance is fixed, that is, the reading gap d between the first chip 221 and the second chip 231 and the outer surfaces of the adjacent convex teeth 31 remains unchanged, avoiding the problem of inaccurate signal reading due to excessive air gap, thereby ensuring the stable output of wheel speed information.

[0091] It should be noted that, for the angle between the center lines of two adjacent convex teeth 31, the specific value of the second angle α2 is not specifically limited in the embodiment of the present application. For example, in other possible embodiments, the specific value of the second angle α2 is determined by the number of convex teeth 31 of the corresponding gear ring 3. For example, when the number of convex teeth 31 is 50, 40, or 32, the second angle α2 is 7.2°, 9°, or 11.25°.

[0092] In some possible implementations, reference Figure 3a , Figure 3b and Fig.10 The wheel speed sensor 2 includes a first frame 222 and a second frame 232. The first frame 222 has a first chip accommodating portion 2221 and a first positioning structure 2222 in a rectangular structure. The first chip 221 is fixed in the first chip accommodating portion 2221. The first positioning structure 2222 is inserted into the first through hole 214 of the housing 21. The first through hole 214 is arranged along the second direction ( Figure 3b The second skeleton 232 has a second chip receiving portion 2321 and a second positioning structure 2322 in a rectangular structure. The second chip 231 is fixed in the second chip receiving portion 2321. The second positioning structure 2322 is inserted into another first through hole 214 of the shell 21.

[0093] It should be noted that the embodiments of the present application do not impose any specific restrictions on the structures of the first chip accommodating portion 2221 and the second chip accommodating portion 2321. For example, in other possible implementations, the structures of the first chip accommodating portion 2221 and the second chip accommodating portion 2321 may also be circular, pentagonal, or other structures, as long as the first chip 221 and the second chip 231 can be fixed.

[0094] It should be noted that the embodiments of the present application do not impose any specific restrictions on the specific values ​​of the skeletons. For example, in other possible implementations, the number of skeletons may be 3, 4, 5, etc.

[0095] Since the shell 21 is injection molded of nylon material, the first frame 222 and the second frame 232 are fixed by clamping the first positioning structure 2222 and the second positioning structure 2322 in the upper mold cavity and the lower mold cavity in the injection mold, and then the shell 21 is cast.

[0096] like Figure 3b As shown, the first positioning structure 2222 is a square block, and the second positioning structure 2322 is a stepped block. The shapes of the two are different. In the process of fixing the first frame 222 and the second frame 232, the front and back sides of the first frame 222 and the second frame 232 can be distinguished by identifying the shapes of the first positioning structure 2222 and the second positioning structure 2322, thereby playing the role of error prevention and positioning. In addition, the protruding structures of the first positioning structure 2222 and the second positioning structure 2322 increase the positioning area of ​​the first frame 222 and the second frame 232 and the mold, and reduce the pressure of the first positioning structure 2222 and the second positioning structure 2322 during the injection molding process.

[0097] In some possible implementations, reference Figure 3b and Fig.10 The first frame 222 also includes three first limiting structures 2223. The three first limiting structures 2223 are arranged along the third direction ( Fig.10 Z direction) is convexly disposed at one end of the first frame 222, along the second direction ( Fig.10 In the middle Y direction), three first limiting structures 2223 are arranged at intervals to form two first chip pin placement grooves 2226, the first sensor 22 also includes two first chip pins 2211, the two first chip pins 2211 are connected to the first chip 221, the first chip pins 2211 are placed in the corresponding first chip pin placement grooves 2226, and the first chip pins 2211 are placed at intervals with the corresponding first chip pin placement grooves 2226, and the third direction is perpendicular to the second direction.

[0098] refer to Figure 3b and Fig.10 The second skeleton 232 also includes three second limiting structures 2323, and the three second limiting structures 2323 are protruded along the third direction at one end of the second skeleton 232. Along the second direction, the three second limiting structures 2323 are spaced apart to form two second chip pin placement grooves 2326. The second sensor 23 also includes two second chip pins 2311, and the two second chip pins 2311 are connected to the second chip 231. The second chip pins 2311 are placed in corresponding second chip pin placement grooves 2326, and the second chip pins 2311 are spaced apart from the corresponding second chip pin placement grooves 2326.

[0099] With the above technical solution, during the operation of the wheel speed sensor 2, taking the first sensor 22 as an example, if the adjacent first chip pins 2211 are overlapped, the first chip 221 will be short-circuited. Since the first limiting structure 2223 is made of nylon material and has no conductivity, three first limiting structures 2223 are provided to form two first chip pin placement grooves 2226 according to the requirements of the two first chip pins 2211. At this time, the first chip pins 2211 are spaced apart from the corresponding first chip pin placement grooves 2226, which can effectively avoid the first chip 221 short-circuit caused by the contact of the adjacent first chip pins 2211.

[0100] Similarly, in the second sensor 23, the second chip 231 is connected to two second chip pins 2311, so three second limiting structures 2323 are set to form two second chip pin placement grooves 2326. At this time, the second chip pins 2311 are placed at intervals with the corresponding second chip pin placement grooves 2326, which can effectively avoid the short circuit of the second chip 231 caused by the contact of adjacent second chip pins 2311.

[0101] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of the first limiting structures 2223 and the second limiting structures 2323. For example, in other possible implementations, the number of the first limiting structures 2223 and the second limiting structures 2323 may be 4, 5, 6, etc.

[0102] refer to Fig.11a and Fig.11b Taking the first frame 222 as an example, the first frame 222 has two third through holes 2227, and the two third through holes 2227 are arranged along the third direction ( Fig.11a The two third through holes 2227 extend along the second direction ( Fig.11a The two third through holes 2227 are spaced apart in the first framework 222 (separated by the first limiting structure 2223) in the Y direction, and the two third through holes 2227 correspond to the two first chip pins 2211. Fig.11b As shown, the first skeleton 222 also includes two first pins 2224 and two first inserting pieces 2225. One end of the two first inserting pieces 2225 and the two first chip pins 2211 are connected at the corresponding third through holes 2227 (as shown in FIG. Fig.11b As shown), the other ends of the two first plug pieces 2225 are connected to the two first pins 2224 respectively, and the two first pins 2224 are connected to the outside through a wiring harness (not shown in the figure).

[0103] With the above technical solution, the first chip 221 outputs a current waveform signal with a fixed rule after algorithm processing, and the signal is transmitted to the automobile electronic control unit (ECU) through the first chip pin 2211, the first plug 2225, the first plug 2224 and the wiring harness. After receiving the current signal, the electronic control unit (ECU) calculates the speed of the wheel according to the frequency of the signal, thereby displaying the speed in real time on the instrument panel. The existence of the two third through holes 2227 of the first frame 222 can ensure that the two first plugs 2225 and the two first chip pins 2211 form corresponding connections respectively, ensuring smooth transmission of signals.

[0104] It should be noted that the embodiment of the present application does not specifically limit the number of the first pins 2224 and the first plug blades 2225. For example, in other possible implementations, the number of the first pins 2224 and the first plug blades 2225 may be 3, 4, or the like.

[0105] It should be noted that the embodiment of the present application does not impose any specific restrictions on the connection method between the first plug 2225 and the first chip pin 2211. For example, in other possible implementations, the connection method between the first plug 2225 and the first chip pin 2211 can be welding, metal wire bundling, etc.

[0106] Similarly, reference Fig.11a and Fig.11b The second frame 232 has two fourth through holes 2327, and the two fourth through holes 2327 are arranged along the third direction ( Fig.11a The second through holes 2327 extend along the second direction ( Fig.11a The two fourth through holes 2327 are spaced apart in the second framework 232 (separated by the second limiting structure 2323) in the Y direction, and the two second chip pins 2311 correspond to each other. Fig.11b As shown, the second skeleton 232 also includes two second pins 2324 and two second inserting pieces 2325, and one end of the two second inserting pieces 2325 and the two second chip pins 2311 are connected at the corresponding fourth through holes 2327 (as shown in FIG. Fig.11b As shown), the other ends of the two second plug pieces 2325 are connected to the two second pins 2324 respectively, and the two second pins 2324 are connected to the outside through a wiring harness (not shown in the figure).

[0107] With the above technical solution, the second chip 231 outputs a current waveform signal with a fixed rule after algorithm processing, and the signal is transmitted to the automobile electronic control unit (ECU) through the second chip pin 2311, the second plug 2325, the second plug 2324 and the wiring harness. After receiving the current signal, the electronic control unit (ECU) calculates the speed of the wheel according to the frequency of the signal, thereby displaying the speed in real time on the instrument panel. The existence of the two fourth through holes 2327 of the second frame 232 can ensure that the two second plugs 2325 and the two second chip pins 2311 form corresponding connections respectively, ensuring smooth transmission of signals.

[0108] It should be noted that the embodiment of the present application does not specifically limit the number of the second pins 2324 and the second plug blades 2325. For example, in other possible implementations, the number of the second pins 2324 and the second plug blades 2325 may be 3, 4, or the like.

[0109] It should be noted that the embodiment of the present application does not impose any specific restrictions on the connection method between the second plug 2325 and the second chip pin 2311. For example, in other possible implementations, the connection method between the second plug 2325 and the second chip pin 2311 can be welding, metal wire bundling, etc.

[0110] In some possible implementations, such as Fig.12 , Fig.13a and Fig.13b As shown, the first chip accommodating portion 2221 includes seven first chip holding structures 22211, wherein three first chip holding structures 22211 are arranged along the second direction ( Fig.12 Y direction), the four first chip holding structures 22211 are arranged at intervals along the third direction ( Fig.12 The seven first chip holding structures 22211 are arranged at intervals in the middle Z direction, and are used to fix the first chip 221.

[0111] The second chip accommodating portion 2321 includes 7 second chip holding structures 23211 , wherein 3 second chip holding structures 23211 are spaced apart along the second direction, 4 second chip holding structures 23211 are spaced apart along the third direction, and the 7 second chip holding structures 23211 are used to fix the second chip 231 .

[0112] Using the above technical solution, taking the first chip 221 and the first chip accommodating portion 2221 as an example, when the first chip 221 is placed in the first chip accommodating portion 2221, it is fixed by seven first chip holding structures 22211. In the embodiment of the present application, the first chip holding structures 22211 are as follows: Fig.13aThe seven first convex ribs 22211 form an interference fit with the first chip 221 when the first chip 221 is placed in the first chip receiving portion 2221, providing positioning and support for the first chip 221 and ensuring the stability of the installation of the first chip 221.

[0113] Due to the interference fit between the first chip receiving portion 2221 and the first chip 221, the first chip 221 will inevitably wear the first convex rib 22211 to form debris during the installation process. Therefore, six first bottom wall grooves 22212 are provided on the bottom wall of the first chip receiving portion 2221 to ensure that the debris formed by the wear of the first convex rib 22211 can fall into the first bottom wall grooves 22212, thereby avoiding the situation where the first chip 221 is not properly installed due to the debris falling on the bottom wall.

[0114] Similarly, when the second chip 231 is placed in the second chip receiving portion 2321, it is fixed by the seven second chip holding structures 23211. In the embodiment of the present application, the second chip holding structures 23211 are as follows: Fig.13a The seven second convex ribs 23211 form an interference fit with the second chip 231 when the second chip 231 is placed in the second chip receiving portion 2321 , providing positioning and support for the second chip 231 and ensuring the stability of the installation of the second chip 231 .

[0115] Due to the interference fit between the second chip receiving portion 2321 and the second chip 231, the second chip 231 will inevitably wear the second convex rib 23211 to form debris during the installation process. Therefore, six second bottom wall grooves 23212 are provided on the bottom wall of the second chip receiving portion 2321 to ensure that the debris formed by the wear of the second convex rib 23211 can fall into the second bottom wall grooves 23212, thereby avoiding the situation where the second chip 231 is not properly installed due to the debris falling on the bottom wall.

[0116] It should be noted that the embodiments of the present application do not impose specific limitations on the first chip holding structure 22211 and the second chip holding structure 23211. For example, in other possible implementations, the first chip holding structure 22211 and the second chip holding structure 23211 may be a snap-on structure, an adhesive structure, etc.

[0117] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of the first chip holding structure 22211 and the second chip holding structure 23211. For example, in other possible implementations, the number of the first chip holding structure 22211 and the second chip holding structure 23211 may be 8, 9, 10, and so on.

[0118] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of the first bottom wall grooves 22212 and the second bottom wall grooves 23212. For example, in other possible embodiments, the number of the first bottom wall grooves 22212 and the second bottom wall grooves 23212 may be 7, 8, 9, and so on.

[0119] In some possible implementations, reference Figure 1 , Figure 3a and Figure 3b , the housing 21 is along the third direction ( Figure 3b The mounting portion 215 is provided protrudingly in the first direction (Z direction), and the mounting portion 215 has a second through hole 2151. The second through hole 2151 is provided along the first direction ( Figure 1 The wheel speed sensor 2 extends in the X direction through the mounting portion 215, and the wheel speed sensor 2 is connected to the external structure through the mounting portion 215.

[0120] refer to Figures 1 to 3b As shown, the embodiment of the present application further provides a car (not shown in the figure), the car includes a ring gear 3 and any of the above-mentioned wheel speed sensors 2, the ring gear 3 includes a plurality of convex teeth 31 and a plurality of missing teeth 32, and the first sensing surface 211 and the second sensing surface 212 of the wheel speed sensor 2 are respectively parallel to the outer surfaces of the corresponding convex teeth 31. The car also includes a bushing 4, which is embedded in the housing 21.

[0121] With the above technical solution, when the housing 21 is injection molded, the bushing 4 is placed in the mold at the same time. After the injection molding is completed, the bushing 4 is embedded in the second through hole 2151 of the mounting portion 215 of the housing 21, and then a bolt is driven in the middle of the bushing 4. There are two through holes on the steering knot of the car, the housing 21 is fixed through one of the through holes, and the bolt passes through the bushing 4 and is connected to the steering knot through the other through hole.

[0122] The installation process and working process of the wheel speed sensor 2 are described in detail below.

[0123] refer to Figure 1 , Figure 3a , Figure 3b and Fig.12Taking the installation of the first chip 221 as an example, when installing the first chip 221, the first chip 221 is fixed by the seven first convex ribs 22211 of the first chip receiving portion 2221 in the first skeleton 222 and placed in the first chip receiving portion 2221. The first convex ribs 22211 form an interference fit with the first chip 221 when the first chip 221 is placed in the first chip receiving portion 2221, providing positioning and support for the first chip 221 and ensuring the stability of the installation of the first chip 221. The placement angle of the first chip 221 and the second chip 231 is determined by the number of convex teeth 31 in the corresponding gear ring 3. The angle between the center lines of two adjacent convex teeth 31 is the second angle α2, and the second angle α2 = 360° / the number of convex teeth 31. The angle between the center lines of the first chip 221 and the second chip 231 is the first angle α1, and the values ​​of the first angle α1 and the second angle α2 are equal, ensuring that the first chip 221 and the second chip 231 are parallel to the outer surfaces of their corresponding convex teeth 31.

[0124] Then, the first skeleton 222 and the second skeleton 232 are fixed in the upper mold cavity and the lower mold cavity of the injection mold by clamping the first positioning structure 2222 and the second positioning structure 2322, and the bushing 4 is also placed in the mold. The injection molding conditions of the first sensing surface 211 and the second sensing surface 212 of the housing 21 are: the center line l1 of the first sensing surface 211 and the center line l2 of the second sensing surface 212 are parallel to the lines l3 and l4 connecting the center of the corresponding convex tooth 31 and the center O of the gear ring 3. That is, the first sensing surface 211 and the second sensing surface 212 are parallel to the outer surface of the corresponding convex tooth 31. In other words, the outer surfaces of the first chip 221, the first sensing surface 211 and the corresponding convex tooth 31 are one-to-one corresponding and parallel to each other; the outer surfaces of the second chip 231, the second sensing surface 212 and the corresponding convex tooth 31 are also one-to-one corresponding and parallel to each other.

[0125] Since the first chip 221 is disposed in the first chip accommodating portion 2221 and the second chip 231 is disposed in the second chip accommodating portion 2321, the specific positions and angles of the first chip 221 and the second chip 231 cannot be observed through the outer shell 21. Therefore, the first sensing surface 211 and the second sensing surface 212 are provided, and the specific positions and angles of the first chip 221 and the second chip 231 corresponding thereto can be known from the placement positions and angles of the first sensing surface 211 and the second sensing surface 212.

[0126] After the injection molding is completed, the bushing 4 is embedded in the second through hole 2151 of the mounting portion 215 of the housing 21, and then a bolt is driven in the middle of the bushing 4. There are two through holes on the steering knot of the car, the housing 21 is fixed through one of the through holes, and the bolt passes through the bushing 4 and is connected to the steering knot through the other through hole, completing the installation process in the car.

[0127] By adopting the above technical solution, the distance between the first chip 221 and the second chip 231 and the outer surface of the corresponding convex tooth 31 can be fixed to a fixed value. In this way, it is ensured that during the rotation of the gear ring 3, the first chip 221 and the second chip 231 can always be parallel to the outer surface of the corresponding convex tooth 31 and the distance is fixed, that is, the reading gap d between the first chip 221 and the second chip 231 and the outer surface of the corresponding convex tooth 31 remains unchanged, avoiding the problem of inaccurate signal reading due to excessive air gap, and ensuring the stable output of wheel speed information.

[0128] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A wheel speed sensor for detecting the rotation speed of a ring gear, wherein the ring gear comprises a plurality of convex teeth, characterized in that: include: A housing, comprising a first sensing surface, a second sensing surface and a receiving portion, wherein the first sensing surface and the second sensing surface are arranged at one end of the housing along a first direction, the first sensing surface and the second sensing surface are arranged at an angle, the first sensing surface and the second sensing surface are connected along a circumferential direction, and the receiving portion extends along the first direction; A first sensor, contained in the containing portion, wherein the first sensor comprises a first chip, and the first chip corresponds to the first sensing surface; A second sensor is accommodated in the accommodation portion, the second sensor includes a second chip, and the second chip corresponds to the second sensing surface; The first chip surface is parallel to the first sensing surface, the second chip surface is parallel to the second sensing surface, the first sensing surface and the second sensing surface are respectively parallel to the outer surfaces of the corresponding convex teeth, and the circumference surrounds the first direction.

2. The wheel speed sensor according to claim 1, characterized in that: The angle between the center lines of the first chip and the second chip is a first angle α1, and the angle between the center lines of two adjacent protruding teeth is a second angle α2, wherein α1=α2, α2=360° / number of protruding teeth.

3. The wheel speed sensor according to claim 1, characterized in that: The wheel speed sensor comprises: a first frame, the first frame having a first chip accommodating portion and a first positioning structure, the first chip being fixed in the first chip accommodating portion, the first positioning structure being inserted into a first through hole of the housing, the first through hole extending through the housing along a second direction, the second direction being perpendicular to the first direction; The second skeleton has a second chip accommodating portion and a second positioning structure, the second chip is fixed in the second chip accommodating portion, and the second positioning structure is inserted into the first through hole of the housing.

4. The wheel speed sensor according to claim 3, characterized in that: The first skeleton also includes a plurality of first limiting structures, which are protruding from one end of the first skeleton along a third direction. Along the second direction, the plurality of first limiting structures are spaced apart to form a first chip pin placement groove. The first sensor also includes a first chip pin, which is connected to the first chip. The first chip pin is placed in the corresponding first chip pin placement groove, and the first chip pin is spaced apart from the corresponding first chip pin placement groove. The third direction is perpendicular to the second direction.

5. The wheel speed sensor according to claim 3, characterized in that: The second skeleton also includes a plurality of second limiting structures, which are protruded from one end of the second skeleton along a third direction. Along the second direction, the plurality of second limiting structures are spaced apart to form second chip pin placement grooves. The second sensor also includes second chip pins, which are connected to the second chip. The second chip pins are placed in corresponding second chip pin placement grooves, and the second chip pins are spaced apart from corresponding second chip pin placement grooves. The third direction is perpendicular to the second direction.

6. The wheel speed sensor according to claim 3, characterized in that: The first chip accommodating portion includes a plurality of first chip holding structures, a portion of the plurality of first chip holding structures are spaced apart along the second direction, another portion of the plurality of first chip holding structures are spaced apart along the third direction, and the plurality of first chip holding structures are used to fix the first chip.

7. The wheel speed sensor according to claim 3, characterized in that: The second chip accommodating portion includes a plurality of second chip holding structures, a portion of the plurality of second chip holding structures are spaced apart along the second direction, another portion of the plurality of second chip holding structures are spaced apart along the third direction, and the plurality of second chip holding structures are used to fix the second chip.

8. The wheel speed sensor according to claim 1, characterized in that: The housing is provided with a mounting portion protruding along the third direction. The mounting portion has a second through hole. The second through hole extends through the mounting portion along the first direction. The wheel speed sensor is connected to the external structure through the mounting portion.

9. A car, characterized in that: The automobile comprises: A gear ring including a plurality of convex teeth; The wheel speed sensor according to any one of claims 1 to 8, wherein the first sensing surface and the second sensing surface of the wheel speed sensor are respectively parallel to the outer surfaces of the corresponding convex teeth.

10. The automobile according to claim 9, characterized in that The automobile further comprises a bushing, which is embedded in the shell.

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