Axle end rotating speed sensor for rail transit

Abstract

The application relates to the technical field of sensors and discloses a shaft end rotating speed sensor for rail transit, which comprises a base body, a first containing groove, a second containing groove, a sensor assembly and a first connecting hole. The speed measuring gear is arranged in the first containing groove. The second containing groove is tangent to the first containing groove. The second containing groove is provided with a notch in communication with the first containing groove and the first connecting hole extending radially along the base body to communicate the second containing groove with the outside. The sensor assembly is arranged in the second containing groove and comprises a mounting shell, a PCB and a sensing element. The mounting shell is detachably connected with the second containing groove, the mounting shell is provided with a containing space, the PCB and the sensing element are arranged in the containing space, and the second containing groove, the mounting shell, the sensing element and the PCB are filled with potting glue. The shaft end rotating speed sensor for rail transit has high universality, compact structure, excellent performance, can meet the harsh use environment of the shaft end of a vehicle, and has high installation efficiency.

Description

Technical Field

[0001] This invention belongs to the field of sensor technology, specifically relating to a shaft end speed sensor for rail transit. Background Technology

[0002] Axle-end speed sensors are typically installed on the motor axle or wheel axle of various types of locomotives in rail transit to provide speed and direction signals for locomotives and rolling stock, and are an important component for the safe operation of locomotives and rolling stock.

[0003] In existing technologies, shaft end speed sensors mainly employ optical or Hall effect principles. Optical principles use optical devices, which prevents the electronic components from being made into a completely enclosed structure, thus requiring a high level of environmental control. In contrast, shaft end speed sensors using the Hall effect principle mount the sensor on the axle box end cover, with a speed-measuring gear mounted on the shaft end. The shaft drives the speed-measuring gear to rotate, triggering the generation of a pulse signal. This pulse signal is then processed by an internal integrated circuit and generates a frequency signal proportional to the rotational speed, which is provided to the vehicle system. Because both the speed-measuring component and the axle system component are fully enclosed within a space consisting of an outer casing and a base, the sensor's environmental requirements are reduced, and the stability and reliability of the pulse signal output are improved.

[0004] However, these types of sensors are generally manufactured as independent components and then installed on the axle box end cover. On the one hand, because the reserved mounting holes on the original motor end cover are usually relatively fixed, there are problems such as low compatibility, low installation efficiency and low installation accuracy when assembling these types of sensors. On the other hand, because these types of sensors are large in size, they occupy a lot of installation and wiring space in the locomotive, and therefore cannot be used in particularly narrow spaces. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a modular, highly versatile, compact, and high-performance axle-end speed sensor for rail transit that can meet the harsh operating environment of vehicle axle ends and has high installation efficiency.

[0006] The objective of this invention can be achieved through the following technical solution: a shaft end speed sensor for rail transit, comprising:

[0007] Matrix;

[0008] The first receiving groove is located at the center of the base and is coaxial with the base. A speed measuring gear is installed inside it.

[0009] The second receiving groove is disposed on the base and is tangent to the first receiving groove. The second receiving groove has a notch that communicates with the first receiving groove in the direction facing the first receiving groove, and a first connecting hole is disposed in the direction away from the notch. The first connecting hole extends radially along the base so that the second receiving groove communicates with the outside.

[0010] The sensor assembly, disposed in the second receiving groove, includes a mounting shell, a PCB board, and a sensing element. The mounting shell is detachably connected to the second receiving groove, and the mounting shell has a receiving space away from the direction of the second receiving groove. The PCB board and the sensing element are both disposed in the receiving space, and potting compound is filled between the second receiving groove, the mounting shell, the sensing element, and the PCB board.

[0011] In the above-mentioned shaft end speed sensor for rail transit, the second receiving groove is recessed along the axial direction of the substrate, and the side wall in the recessed direction is provided with a groove. The groove is recessed in a direction away from the center of the second receiving groove to allow potting compound to flow in and form a snap-fit ​​with the cured potting compound.

[0012] In the aforementioned shaft end speed sensor for rail transit, the notch is snapped into the mounting housing, and includes a first connecting end and a second connecting end, wherein the first connecting end and the second connecting end have a diameter difference.

[0013] In the aforementioned type of shaft end speed sensor for rail transit, the mounting housing is provided with a first connecting part near the first receiving groove. The first connecting part is dovetail-shaped and includes a first connecting surface and a second connecting surface. The first connecting surface is fitted and connected to the first connecting end and the second connecting end, and the second connecting surface is fitted and connected to the inner wall of the second receiving groove.

[0014] In the aforementioned type of shaft end speed sensor for rail transit, the first connecting portion is provided with a mounting groove in a direction away from the first receiving groove. The mounting groove extends in a direction away from the first connecting portion, and the size of the mounting groove is adapted to the size of the sensing element in order to position the sensing element.

[0015] In the aforementioned type of shaft end speed sensor for rail transit, mounting holes are provided on both sides of the second receiving groove, and second connecting parts corresponding to the mounting holes are provided on both sides of the mounting shell. The second connecting parts have through holes so that the second connecting parts can be detachably connected to the mounting holes by fasteners.

[0016] In the aforementioned type of shaft end speed sensor for rail transit, a support part and a snap-fit ​​part are provided in the accommodating space of the mounting shell. The support part is located in the direction of the mounting shell near the second accommodating groove, and the snap-fit ​​part is located in the direction of the mounting shell away from the second accommodating groove. The PCB board is snapped between the support part and the snap-fit ​​part, with one side abutting against the support part and the other side abutting against the snap-fit ​​part.

[0017] In the aforementioned shaft end speed sensor for rail transit, both the mounting housing and the PCB board are provided with flow holes. These flow holes penetrate the mounting housing and the PCB board respectively, allowing potting compound to pass through, and the potting compound forms a wrap around the sensor assembly.

[0018] In the aforementioned type of shaft end speed sensor for rail transit, several second receiving slots are provided and arranged in a ring around the axis of the base. Several sensor components are provided, and their number is equal to and corresponds one-to-one with the number of second receiving slots.

[0019] In the aforementioned type of shaft end speed sensor for rail transit, the substrate is further provided with a plurality of second connecting holes, which extend through the substrate along the thickness direction and are arranged in a ring around the axis of the substrate.

[0020] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0021] 1. By setting a base that can be used as an end cover for the non-drive end of a motor or a wheel axle box, and integrating a speed measuring gear and sensor assembly on the base, a modular design is achieved, which allows the axle end speed sensor of this application to be adapted to any motor or wheel axle box, greatly improving the versatility and applicability of the product. On the other hand, this integration method effectively reduces the installation space and wiring space required for the sensor assembly, thereby saving the internal space of the locomotive and enabling this application to cope with situations with limited installation space.

[0022] 2. By setting up a first receiving slot and a second receiving slot, placing the speed measuring gear in the first receiving slot and the sensor assembly in the second receiving slot, the accuracy of the cooperation between the sensor assembly and the speed measuring gear is effectively improved, thereby improving the detection performance. It also eliminates the need for additional assembly of the sensor assembly, thus improving installation efficiency.

[0023] 3. By setting a groove in the second receiving groove to allow the potting compound to flow in and form a snap-fit ​​with the cured potting compound, the strength of the connection is not only effectively improved, but also the stability of the connection between the sensor assembly and the second receiving groove is improved, which can prevent the sensor assembly from falling off due to vibration.

[0024] 4. By providing a dovetail-shaped first connecting part on the mounting shell, and setting the notch to be funnel-shaped to engage with the first connecting part, the first connecting part and the notch are connected without gaps, which not only effectively avoids glue overflow at this point, but also improves the stability of the connection between the mounting shell and the second receiving groove.

[0025] 5. By setting a mounting groove made of plastic parts and adapting the size of the mounting groove to the size of the sensing element, not only is high-precision positioning of the sensing element achieved, ensuring the accuracy of the relative position between the sensing element and the speed measuring gear, thus ensuring the stability and consistency of the sensor signal; it also separates the PCB board from the metal parts, giving the sensing element high insulation and withstand voltage capability.

[0026] 6. By setting potting compound and providing flow holes for the potting compound to flow on the mounting shell and PCB board, the second receiving groove, mounting shell, sensing element and PCB board are all filled with potting compound. At the same time, the potting compound forms a covering on the second receiving groove and sensor assembly, and the surface of the potting compound is flush with the end face of the second receiving groove. On the one hand, it can make the connection between the sensor assembly and the substrate more stable, and on the other hand, it can effectively improve the vibration resistance, temperature resistance and cyclic stress resistance of the sensor assembly, and provide effective protection for the PCB board and sensing element, thereby meeting the needs of vehicle axle end use in harsh environments.

[0027] 7. By providing several of the second receiving slots and sensor assemblies and arranging them in a ring around the axis of the base, users can increase or decrease the number of sensor signal channels according to their needs, and can also set the phase difference as needed.

[0028] 8. By setting up a support part and a snap-fit ​​part, and snapping the PCB board between the two, a gap is created between the PCB board and the mounting shell, which facilitates the flow of potting compound and effectively eliminates air bubbles in the potting compound. In addition, the snap-fit ​​part is barbed, which can guide the installation of the PCB board and prevent the PCB board from falling out.

[0029] 9. By setting the speed measuring gear as a separate gear ring and gear seat, the moment of inertia can be reduced, and the replacement of different models of gear rings can be made convenient.

[0030] 10. By using aluminum alloy materials for components such as the base and gear seat, the weight of the shaft end speed sensor is effectively reduced, thus meeting the requirements of lightweight locomotive design. Attached Figure Description

[0031] Figure 1 This is an exploded view of the shaft end speed sensor according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of the substrate in the shaft end speed sensor according to an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the structure of the base and gear ring in the shaft end speed sensor of this invention.

[0034] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0035] Figure 5 This is a schematic diagram of the mounting housing in the shaft end speed sensor according to an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of the PCB board structure in the shaft end speed sensor of this invention.

[0037] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 100, base; 110, second connecting hole; 200, first receiving groove; 300, second receiving groove; 310, notch; 311, first connecting end; 312, second connecting end; 320, first connecting hole; 330, accommodating space; 340, groove; 350, mounting hole; 400, mounting shell; 410, first connecting part; 411, first connecting surface; 412, second connecting surface; 420, mounting groove; 430, second connecting part; 440, support part; 450, snap-fit ​​part; 460, flow hole; 500, PCB board; 600, sensing element; 700, potting compound; 800, speed measuring gear; 810, gear ring; 820, gear seat; 830, connector; 900, cable assembly. Detailed Implementation

[0038] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0039] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0040] like Figures 1 to 6 As shown in the figure, an embodiment of the present invention provides a shaft end speed sensor for rail transit, including a base 100, a first receiving groove 200, a second receiving groove 300, a mounting shell 400, a PCB board 500, a sensing element 600, potting compound 700, and a speed measuring gear 800.

[0041] like Figures 1 to 6 As shown, an embodiment of the present invention provides a shaft end speed sensor for rail transit, comprising: a base 100, which is used as an end cover for the non-drive end of a motor or a wheel axle box;

[0042] The first receiving groove 200 is located at the center of the base 100 and is coaxial with the base 100. A speed measuring gear 800 is installed inside it.

[0043] The second receiving groove 300 is disposed on the base 100 and is tangent to the outer diameter of the first receiving groove 200. The second receiving groove 300 is provided with a notch 310 communicating with the first receiving groove 200 in the direction facing the first receiving groove 200, and the second receiving groove 300 is provided with a first connecting hole 320 in the direction away from the notch 310. The first connecting hole 320 extends radially along the base 100 so that the second receiving groove 300 communicates with the outside.

[0044] A sensor assembly, disposed within a second receiving groove 300, includes a mounting housing 400, a PCB board 500, and a sensing element 600. The mounting housing 400 is detachably connected to the second receiving groove 300, and the mounting housing 400 has a receiving space 330 in a direction away from the second receiving groove 300. The PCB board 500 and the sensing element 600 are both disposed within the receiving space 330. The space between the second receiving groove 300, the mounting housing 400, the sensing element 600, and the PCB board 500 is filled with potting compound 700. By integrating the speed measuring gear 800 and the sensor assembly onto the base 100, and using the base 100 as the end cover of the non-drive end of the motor or the wheel axle box, a modular design is achieved. This allows the axle end speed sensor of this application to be adapted to any motor or wheel axle box, greatly improving the product's versatility and applicability. On the other hand, this integration method effectively reduces the installation space and wiring space required for the sensor assembly, thereby saving internal space in the locomotive and enabling this application to cope with situations with limited installation space. Furthermore, the setting of the first receiving groove 200 and the second receiving groove 300 effectively improves the accuracy of the fit between the sensor assembly and the speed measuring gear 800, thereby improving the detection performance. It also eliminates the need for separate assembly of the sensor assembly, thus improving installation efficiency.

[0045] Specifically, such as Figures 1 to 4 As shown, in this embodiment, the base 100 is circular and is used as an end cover for the non-drive end of the motor or the wheel axle box. It is made of aluminum alloy to reduce the weight of the axle end speed sensor and meet the requirements of lightweight locomotive design.

[0046] The base 100 has a first receiving groove 200 at its center, and a speed measuring gear 800 is installed in the first receiving groove 200. The first receiving groove 200 is circular and coaxial with the base 100, and is used to accommodate the speed measuring gear 800. There is an axial gap between the speed measuring gear 800 and the first receiving groove 200.

[0047] The speed measuring gear 800 includes a gear ring 810 and a gear seat 820. The gear ring 810 is connected to the gear seat 820 via a connector. The gear ring 810 is made of carbon steel and can cause changes in the magnetic field. As a signal transmitting component, the gear seat 820 is made of aluminum alloy to achieve a lightweight design. The gear ring 810 and the gear seat 820 are connected to the first receiving groove 200 via a connector 830. The gear ring 810 is placed in the first receiving groove 200, and its diameter is smaller than the diameter of the first receiving groove 200, so that there is a radial gap between the speed measuring gear 800 and the first receiving groove 200. This allows the speed measuring gear 800 to rotate relative to the base 100 when it rotates with the rotating shaft (not shown in the figure), causing changes in the magnetic field of the magnet in the sensing element 600, generating a frequency signal. With the cooperation of the PCB board 500, the speed measuring function of the sensor is realized.

[0048] It is worth noting that setting the speed measuring gear 800 as a separate gear ring 810 and gear seat 820 can reduce the moment of inertia and also allow for convenient replacement of different models of gear ring 810.

[0049] In this embodiment, a second receiving groove 300 is also provided on the substrate 100. The second receiving groove 300 is tangent to the first receiving groove 200 and is used to accommodate the sensor assembly. The second receiving groove 300 is rectangular and has a notch 310 that communicates with the first receiving groove 200 in the direction facing the first receiving groove 200, so as to facilitate the sensing element 600 to sense the speed measuring gear 800. The second receiving groove 300 is provided with a first connecting hole 320 in the direction away from the notch 310. The first connecting hole 320 extends radially along the substrate 100 so as to communicate with the outside of the second receiving groove 300, so that the PCB board 500 placed in the second receiving groove 300 can be connected to the external system through the cable assembly 900.

[0050] In this embodiment, the second receiving groove 300 is recessed along the axial direction of the substrate 100, and a groove 340 is provided on the side wall in the recessed direction. The groove 340 surrounds the four walls of the second receiving groove 300 and is recessed in the direction away from the center of the second receiving groove 300 to allow the potting compound 700 to flow in and form a snap-fit ​​with the cured potting compound 700. This not only effectively improves the strength of the connection, but also improves the stability of the connection between the sensor assembly and the second receiving groove 300, and can prevent the sensor assembly from falling off due to vibration.

[0051] In this embodiment, the notch 310 engages with the mounting shell 400. It includes a first connecting end 311 and a second connecting end 312. The first connecting end 311 is located away from the first receiving groove 200, and the second connecting end 312 is located close to the first receiving groove 200. The first connecting end 311 and the second connecting end 312 have a diameter difference. Preferably, the diameter of the second connecting end 312 is larger than the diameter of the first connecting end 311, so that the notch 310 is funnel-shaped to engage with the mounting shell 400. This prevents the potting compound 700 from seeping out from this point during the subsequent potting process, effectively avoiding overflow. It also further improves the stability of the connection between the mounting shell 400 and the second receiving groove 300.

[0052] In this embodiment, mounting holes 350 are also provided on both sides of the second receiving groove 300. The mounting holes 350 are threaded holes, and there is a certain height of installation space above the mounting holes 350, so that the mounting shell 400 can be detachably connected to the second receiving groove 300 through fasteners and the mounting holes 350, which effectively ensures the stability of the sensor assembly installation before the potting process.

[0053] In this embodiment, several second receiving slots 300 are provided and arranged in a ring around the axis of the base 100. The number of sensor signal channels can be increased or decreased according to the needs of use, and the phase difference can also be set as needed. Preferably, in this embodiment, two second receiving slots 300 are provided.

[0054] To enable connection with a motor or wheel axle box, in this embodiment, the base 100 is further provided with a plurality of second connection holes 110. The second connection holes 110 are located near the outer edge of the base 100. The second connection holes 110 extend through the base 100 along the thickness direction and are arranged in a ring around the axis of the base 100. Preferably, there are six second connection holes 110.

[0055] In order to realize the speed measurement function of the sensor by cooperating with the speed measuring gear 800, in this embodiment, the sensor assembly is disposed in the second receiving groove 300, and there are several of them, the number of which is equal to the number of the second receiving groove 300 and corresponds one-to-one; the sensor assembly is integrated in the base 100, which effectively reduces the external installation space and wiring space required for the sensor assembly, so that this application can cope with the situation of narrow installation space; and the sensor assembly does not need to be assembled separately, which effectively improves the installation efficiency of this application.

[0056] like Figure 1 , Figure 4 , Figure 5 , Figure 6As shown, in this embodiment, the sensor assembly includes a mounting housing 400, a PCB board 500, and a sensing element 600. The mounting housing 400 is detachably connected to the second receiving groove 300, and the mounting housing 400 has a receiving space 330 in a direction away from the second receiving groove 300. The PCB board 500 and the sensing element 600 are both disposed in the receiving space 330. The space between the second receiving groove 300, the mounting housing 400, the sensing element 600, and the PCB board 500 is filled with potting compound 700, so that the sensor assembly can be fixed in the second receiving groove 300, forming a magnetic field induction with the speed measuring gear 800 and generating a frequency signal. With the cooperation of the PCB board 500, the speed measuring function of the sensor is realized.

[0057] like Figure 4 , Figure 5 As shown, in this embodiment, the mounting shell 400 is rectangular, and a first connecting portion 410 is provided on the mounting shell 400 near the first receiving groove 200. The first connecting portion 410 is dovetail-shaped and includes a first connecting surface 411 and a second connecting surface 412. The first connecting surface 411 is fitted and connected to the first connecting end 311 and the second connecting end 312 of the notch 310, and the second connecting surface 412 is fitted and connected to the inner wall of the second receiving groove 300. This allows the first connecting portion 410 and the notch 310 to achieve a gapless connection, which not only effectively avoids glue overflow at this point, but also improves the stability of the connection between the mounting shell 400 and the second receiving groove 300.

[0058] To achieve positioning of the sensing element 600, in this embodiment, the first connecting portion 410 is provided with a mounting groove 420 in the direction away from the first receiving groove 200. The mounting groove 420 extends in the direction away from the first connecting portion 410, and the size of the mounting groove 420 is adapted to the size of the sensing element 600, thereby achieving high-precision positioning of the sensing element 600. This effectively ensures the accuracy of the relative position between the sensing element 600 and the speed measuring gear 800, thereby improving the detection accuracy of this application and ensuring the stability and consistency of the sensor signal. In addition, the mounting groove 420 is made of plastic, separating the PCB board 500 from the metal parts, so that the sensing element 600 has high insulation and withstand voltage capability.

[0059] In this embodiment, the mounting housing 400 is provided with second connecting portions 430 on both sides, corresponding to the mounting holes 350 of the second receiving groove 300. The second connecting portions 430 have through holes, so that the second connecting portions 430 can be detachably connected to the mounting holes 350 by fasteners, which effectively ensures the stability of the sensor assembly installation before the potting process.

[0060] In this embodiment, the mounting shell 400 has annularly distributed support portions 440 and snap-fit ​​portions 450 within its accommodating space 330. Several support portions 440 and snap-fit ​​portions 450 are provided, preferably four of each. The support portions 440 are located on the two short sides of the mounting shell 400 near the second accommodating groove 300, and the snap-fit ​​portions 450 are located on the two long sides of the mounting shell 400 away from the second accommodating groove 300, forming a placement space for the PCB board 500. This creates a gap between the PCB board 500 and the mounting shell 400, facilitating the flow of the potting compound 700 and effectively eliminating air bubbles within the potting compound 700.

[0061] In this embodiment, the snap-fit ​​portion 450 is barbed, which can guide the installation of the PCB board 500 and prevent the PCB board 500 from coming off.

[0062] In this embodiment, the mounting shell 400 is also provided with a flow hole 460, which extends through the mounting shell 400 so that the potting compound 700 can flow through the mounting shell 400 into the second receiving groove 300, thereby improving the stability of the connection between the mounting shell 400 and the second receiving groove 300.

[0063] Preferably, in this embodiment, the flow hole 460 is provided in a plurality of different shapes.

[0064] like Figure 3 , Figure 6 As shown, in this embodiment, the PCB board 500, serving as a power supply, signal acquisition, and signal processing component, is mounted between the support portion 440 and the latching portion 450. One side of the PCB board 500 abuts against the support portion 440, and the other side abuts against the latching portion 450. The PCB board 500 is also provided with several flow holes 460, which penetrate the PCB board 500, allowing the potting compound 700 to flow through the PCB board 500 into the mounting shell 400 and the second receiving groove 300. Furthermore, one end of the circuit portion of the PCB board 500 is connected to the sensing element 600 for signal acquisition, and the other end is connected to the cable assembly 900 for signal feedback, thereby realizing the speed measurement function of the sensor.

[0065] In this embodiment, to achieve a stable connection between the sensor assembly and the second receiving groove 300, a potting compound 700 is provided between the second receiving groove 300 and the sensor assembly. The potting compound 700 is an epoxy resin, which pots the second receiving groove 300 on which the sensor assembly is installed. The potting compound 700 passes through the sensing element 600, the PCB board 500, and the mounting shell 400 in sequence and enters the second receiving groove 300 to form a covering on the second receiving groove 300 and the sensor assembly. The surface of the potting compound 700 is flush with the end face of the second receiving groove 300 to provide effective protection for the PCB board 500 and the sensing element 600.

[0066] It is worth noting that, in this embodiment, the filling of potting compound 700 can, on the one hand, make the connection between the sensor assembly and the substrate 100 more stable, and on the other hand, effectively improve the sensor assembly's resistance to vibration, temperature and cyclic stress, thereby meeting the needs of the vehicle axle end for use in harsh environments.

[0067] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0069] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A shaft-end speed sensor for rail transit, characterized in that, include: Matrix (100); The first receiving groove (200) is located at the center of the base (100) and is coaxial with the base (100), and a speed measuring gear (800) is installed inside it; A second receiving groove (300) is disposed on the base (100) and tangent to the first receiving groove (200). The second receiving groove (300) has a notch (310) communicating with the first receiving groove (200) in the direction facing the first receiving groove (200), and a first connecting hole (320) is disposed in the direction away from the notch (310). The first connecting hole (320) extends radially along the base (100) so that the second receiving groove (300) communicates with the outside. A sensor assembly, disposed within a second receiving groove (300), includes a mounting housing (400), a PCB board (500), and a sensing element (600). The mounting housing (400) is detachably connected to the second receiving groove (300), and the mounting housing (400) has a receiving space (330) in a direction away from the second receiving groove (300). The PCB board (500) and the sensing element (600) are both disposed within the receiving space (330), and potting compound (700) fills the space between the second receiving groove (300), the mounting housing (400), the sensing element (600), and the PCB board (500). The second receiving groove (300) is recessed along the axial direction of the base (100); The notch (310) engages with the mounting housing (400), and includes a first connecting end (311) and a second connecting end (312), wherein the first connecting end (311) and the second connecting end (312) have a diameter difference; The mounting shell (400) is provided with a first connecting part (410) near the first receiving groove (200). The first connecting part (410) is dovetail-shaped and includes a first connecting surface (411) and a second connecting surface (412). The first connecting surface (411) is fitted and connected to the first connecting end (311) and the second connecting end (312), and the second connecting surface (412) is fitted and connected to the inner wall of the second receiving groove (300).

2. The shaft end speed sensor for rail transit according to claim 1, characterized in that, The second receiving groove (300) has a groove (340) on its recessed sidewall. The groove (340) is recessed in a direction away from the center of the second receiving groove (300) to allow the potting compound (700) to flow in and to form a snap-fit ​​with the cured potting compound (700).

3. The shaft end speed sensor for rail transit according to claim 1, characterized in that, The first connecting portion (410) is provided with a mounting groove (420) in a direction away from the first receiving groove (200). The mounting groove (420) extends in a direction away from the first connecting portion (410), and the size of the mounting groove (420) is adapted to the size of the sensing element (600) to position the sensing element (600).

4. A shaft-end speed sensor for rail transit according to claim 1, characterized in that, The second receiving groove (300) is provided with mounting holes (350) on both sides, and the mounting shell (400) is provided with second connecting parts (430) corresponding to the mounting holes (350) on both sides. The second connecting parts (430) have through holes so that the second connecting parts (430) can be detachably connected to the mounting holes (350) by fasteners.

5. A shaft-end speed sensor for rail transit according to claim 1, characterized in that, The mounting housing (400) has a support part (440) and a snap-fit ​​part (450) in its accommodating space (330). The support part (440) is located in the mounting housing (400) near the second accommodating groove (300), and the snap-fit ​​part (450) is located in the mounting housing (400) away from the second accommodating groove (300). The PCB board (500) is snapped between the support part (440) and the snap-fit ​​part (450), with one side abutting against the support part (440) and the other side abutting against the snap-fit ​​part (450).

6. A shaft-end speed sensor for rail transit according to claim 1, characterized in that, Both the mounting housing (400) and the PCB board (500) are provided with flow holes (460), which pass through the mounting housing (400) and the PCB board (500) respectively, so that potting compound (700) can pass through, and the potting compound (700) forms a wrapping shape for the sensor assembly.

7. A shaft-end speed sensor for rail transit according to claim 1, characterized in that, The second receiving groove (300) is provided in a plurality of them, arranged in a ring around the axis of the base (100), wherein the sensor assembly is provided in a plurality of them, the number of which is equal to the number of the second receiving groove (300) and corresponds one to one.

8. A shaft-end speed sensor for rail transit according to claim 1, characterized in that, The substrate (100) is also provided with a plurality of second connecting holes (110), which extend through the substrate (100) along the thickness direction and are arranged in a ring around the axis of the substrate (100).

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