Speed sensor

Abstract

The utility model belongs to the technical field of speed sensors, and discloses a speed sensor, which comprises a circuit board and a threaded probe. The circuit board is fixedly arranged in the threaded probe and penetrates through the interior of the threaded probe to be aligned with the speed measurement gear for speed measurement; the threaded probe is screwed into the threaded hole in the gear box through the external thread; a limiting cutting face is further arranged on the outer side face of the threaded probe, and a limiting clamping strip matched with the limiting cutting face is fixedly arranged on the gearbox. Compared with the installation of a traditional speed sensor, the speed sensor can be installed and fixed only through one all-metal threaded probe and the limiting clamping strip, and the installation requirement can be met only through one threaded hole in the gearbox. And meanwhile, through the cooperation of the limiting cutting surface and the limiting clamping strip, the mounting position of the speed sensor is kept unique, the output signal phase difference of the speed sensor meets the requirement, the mounting convenience of the speed sensor is effectively improved, and the mounting space is saved.

Description

Technical Field

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

[0002] On rail vehicles, the stability of the vehicle system depends largely on the accuracy and reliability of the speed signals it collects, which include the current speed value and the speed change. These tasks are accomplished by various speed sensors on rail vehicles. However, current speed sensors still have the following shortcomings:

[0003] Conventional speed sensor probes are mounted using one through-hole and two threaded holes. Due to the numerous large electronic components and relatively limited space on rail vehicle bogies, bogie accessories must be as compact and space-saving as possible, compact, and easy to install and remove. Consequently, conventional speed sensors not only occupy a large space but also require two M8 hexagon socket head screws secured to the flange using a ratchet wrench. Due to space constraints, installation and removal require the operator to stand sideways on the outside of the bogie and reach into the bogie gearbox with one hand to use the ratchet wrench. This is not only inconvenient but also physically demanding, significantly impacting work efficiency. Furthermore, since conventional speed sensors require four through-holes for installation—one φ26 through-hole, one φ4 deep 6-inch dowel pin hole, and two φ9 threaded through-holes—the installation space required is substantial, significantly impacting the overall design of the bogie gearbox.

[0004] Therefore, there is an urgent need for a speed sensor that is easy to install and saves space to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this utility model is to provide a speed sensor that is easy to install and saves space. The specific technical solution is as follows:

[0006] A speed sensor includes a circuit board and a threaded probe;

[0007] The circuit board is fixedly arranged in the threaded probe and passes through the interior of the threaded probe to align with the speed measuring gear to measure the speed; the threaded probe is screwed into the threaded hole on the gear box where the speed measuring gear is installed through the external thread;

[0008] A limiting cutting surface is further provided on the outer surface of the threaded probe, and a limiting clip matching the limiting cutting surface is fixed on the gear box. The limiting cutting surface is aligned with the limiting clip to limit the installation angle of the threaded probe.

[0009] Preferably, a locking nut and a compression nut are threadedly connected to the threaded probe, the compression nut is arranged to conflict with the gear box, and the locking nut is arranged to conflict with the compression nut, so as to press the threaded probe into the threaded hole.

[0010] Preferably, the chamfered end of the compression nut is arranged toward the locking nut; and an O-ring for sealing is further provided between the locking nut and the compression nut.

[0011] Preferably, a double-cone sealing ring is provided between the compression nut and the gear box.

[0012] Preferably, the locking nut and the compression nut are also coated with Sicardin sealing putty.

[0013] Preferably, a heat-conductive epoxy encapsulating material is further filled between the circuit board and the threaded probe to fix the circuit board in the threaded probe.

[0014] Preferably, it further comprises a connecting pipeline, wherein the connecting pipeline comprises a bellows and hose connectors provided at both ends of the bellows;

[0015] The threaded probe is also threadedly connected with a threaded adapter, and the threaded adapter is connected to a hose connector.

[0016] Preferably, one end of the bellows is connected to the threaded probe via a hose connector and a threaded adapter; the other end is connected to the connector plug via a hose connector;

[0017] The cables on the circuit board pass through the threaded adapter and the connecting pipe in sequence and are electrically connected to the connector plug.

[0018] Preferably, a connector socket matching the connector plug is also included.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] A speed sensor includes a circuit board and a threaded probe; the circuit board is fixedly arranged in the threaded probe and passes through the interior of the threaded probe to align with the speed measuring gear for speed measurement; the threaded probe is screwed into the threaded hole on the gear box on which the speed measuring gear is installed via an external thread; a limiting cutting surface is also provided on the outer surface of the threaded probe, and a limiting clip matching the limiting cutting surface is also fixed on the gear box, and the limiting cutting surface is aligned with the limiting clip to limit the installation angle of the threaded probe. The utility model can achieve installation and fixation with only an all-metal threaded probe and a limiting clip, and only one threaded hole is required on the gear box to meet the installation requirements. At the same time, the limiting cutting surface and the limiting clip cooperate to ensure that the speed sensor installation position remains unique and the phase difference of the speed sensor output signal meets the requirements, effectively improving the convenience of speed sensor installation and saving installation space.

[0021] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 2 is a schematic diagram of the structure of the speed sensor in use in the embodiment;

[0023] Figure 2 yes Figure 1 Partial view (lower section view);

[0024] Figure 3 1 is a schematic diagram of the assembly of the locking nut, the compression nut, the O-ring, the double-cone sealing ring, the threaded probe and the gear box in the embodiment.

[0025] In the figure: 1. Circuit board; 2. Threaded probe, 2.1. Limit cutting surface; 3. Threaded adapter; 4. Hose connector; 5. Locking nut; 6. Compression nut; 7. O-ring; 8. Double-cone sealing ring; 9. Thermal conductive epoxy encapsulation material; 10. Bellows; 11. Cable; 12. Sicardi butyl sealing putty; 13. Connector plug; 14. Connector socket; 15. Speed ​​measuring gear; 16. Gearbox, 16.1. Threaded hole, 16.2. Limiting strip. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] Example:

[0028] A speed sensor, reference Figure 1-2 , comprising a circuit board 1 and a threaded probe 2;

[0029] The circuit board 1 is fixedly mounted within the threaded probe 2 and passes through the interior of the threaded probe 2 to align with the speed measuring gear 15 for speed measurement. The threaded probe 2 is screwed into a threaded hole 16.1 in the gear box 16 on which the speed measuring gear 15 is mounted, via external threads. The threaded probe is a long, sleeve-like structure made of metal, with external threads uniformly arranged on its outer wall. A limiting cutting surface 2.1 is also provided on the outer surface of the threaded probe 2. The gear box 16 is also fixedly equipped with a limiting clip 16.2 that matches the limiting cutting surface 2.1. The limiting cutting surface 2.1 is aligned with the limiting clip 16.2 to limit the installation angle of the threaded probe 2.

[0030] Through the above settings, compared with the installation shortcomings of traditional speed sensors, the speed sensor in this embodiment can be installed and fixed only by an all-metal threaded probe and a limit clip, and only one M20×1.5 threaded hole is required on the gearbox to meet the installation requirements. At the same time, the limiting cutting surface and the limit clip assist in positioning, which facilitates the uniqueness of the speed sensor installation position and ensures that the phase difference of the speed sensor output signal meets the technical requirements; it effectively improves the convenience of speed sensor installation and saves installation space.

[0031] The threaded probe 2 is also threadedly connected with a locking nut 5 and a compression nut 6. The compression nut 6 is arranged to conflict with the gear box 16. The locking nut 5 and the compression nut 6 are arranged to conflict with each other, and are used to compress the threaded probe 2 into the threaded hole 16.1.

[0032] See also Figure 3 , the chamfered end of the compression nut 6 is arranged toward the locking nut 5; an O-ring 7 for sealing is also provided between the locking nut 5 and the compression nut 6. A double-cone sealing ring 8 is also provided between the compression nut 6 and the gearbox 16. The locking nut 5 and the compression nut 6 are also coated with Sicardin sealing putty 12. During the installation process, the compression nut 6 squeezes the double-cone sealing ring 8, causing it to expand and deform under force, and fit tightly and evenly along the surface of the threaded hole of the gearbox. Because the other side of the double-cone sealing ring 8 fits tightly with the bogie gearbox and cannot move, the two fitting surfaces of the double-cone sealing ring 8 expand evenly to the surrounding areas during the extrusion process and fit tightly on the compression nut 6 and the bogie gearbox. Through computational simulation and the use of special polymer materials with high temperature resistance, high shrinkage ratio and excellent wear resistance, the thickness and width of the double-cone sealing ring 8 are calculated, so that the double-cone sealing ring 8 has sufficient compressive strength and elongation, ensuring that the contact surface between the double-cone sealing ring 8 and the compression nut 6 and the bogie gearbox is close to the outer edge of the compression nut 6 after the double-cone sealing ring 8 is deformed by force, thereby ensuring that external water droplets cannot enter the contact surface between the compression nut 6 and the bogie gearbox even under high water pressure. Then use a torque wrench to tighten the locking nut 5 and install it in place. Since the O-ring 7 is installed in the bottom groove of the locking nut 5, as the locking nut 5 squeezes the O-ring 7 during the installation process, it is forced to expand and deform, and fits tightly and evenly at the junction of the locking nut 5 and the compression nut 6, and finally a waterproof sealing effect can be achieved on the contact surface between the locking nut 5 and the compression nut 6.

[0033] Apply an appropriate amount of Sikalastomer-710 sealing cement 12 to the locknut 5 and compression nut 6. The thickness should be greater than 3 mm. This structure can reduce the risk of water seepage from the bogie gearbox threaded connection after aging and failure of the non-metallic sealing fittings at the speed sensor installation site.

[0034] After the speed sensor of this embodiment is installed, it and the threaded probe are both connected by metal structure threads. After the vehicle has run for a certain mileage or time, it is necessary to use a high-pressure water gun to clean the rail vehicle. Through the above setting, the waterproof level is guaranteed to meet the technical requirements of IP68, ensuring that after cleaning, dripping water is prevented from entering the gear box and causing damage to the equipment.

[0035] The circuit board is installed in the threaded probe, and then the cutting surface on the threaded probe cooperates with the metal limit strip to keep the threaded probe at a suitable fixed angle. The circuit board is then rotated and adjusted to make the relative position of the Hall sensitive point on the Hall sensitive element of the circuit board and the speed measuring gear reach a certain state, ensuring that the phase difference of the two signals output by the circuit board meets the technical requirements. Finally, the circuit board is fixed in the threaded probe by using thermal conductive epoxy encapsulation material.

[0036] In the embodiment, a section of the sheath and insulation layer is stripped off at one end of the cable 11, and the exposed core wire of the cable 11 is soldered to the solder hole on the circuit board 1. Then, the other end of the cable 11 is passed through the threaded adapter 3, the hose connector 4, and the corrugated tube 10 in sequence to complete the assembly of the speed sensor.

[0037] A heat-conducting epoxy encapsulating material 9 is further filled between the circuit board 1 and the threaded probe 2 to fix the circuit board 1 in the threaded probe 2 .

[0038] The device also includes a connecting pipeline comprising a bellows 10 and hose connectors 4 disposed at both ends of the bellows 10. A threaded adapter 3 is also threadedly connected to the threaded probe 2, and the threaded adapter 3 is connected to the hose connector 4. With the above arrangement, the speed sensor of this embodiment is primarily fixed via threads, significantly reducing the difficulty and requirements of installation.

[0039] One end of the corrugated tube 10 is connected to the threaded probe 2 via a hose connector 4 and a threaded adapter 3; the other end is connected to a connector plug 13 via the hose connector 4. The cable 11 on the circuit board 1 is electrically connected to the connector plug 13 by passing through the threaded adapter 3 and the connecting pipe. A connector socket 14 that mates with the connector plug 13 is also included.

[0040] Insert the exposed core wire of the cable 11 into the pin of the connector plug 13, use a needle pressing tool to fasten the pin of the connector plug 14 and the core wire of the cable 11 inside it, then pass the pin of the plug 14 through the hose connector 12 and insert it into the rubber hole of the plug 14, and finally fasten the hose connector 12 and the plug 14 with threads.

[0041] like Figure 1 and 2As shown, when installing the speed sensor, the locking nut 5, O-ring 7, compression nut 6 and double-cone sealing ring 8 are sequentially inserted into the threaded probe 2; it is necessary to note that the chamfered side of the compression nut faces upwards and the groove side faces downwards; then the threaded probe 2 is gradually screwed into the threaded hole of the gearbox. When screwing in, the cable 11 rotates together with the threaded probe 2 to avoid damaging the cable 11. When the threaded probe 2 cannot be screwed in further, the sensing surface of the threaded probe 2 has contacted the speed measuring gear. Do not continue to screw in the threaded probe 2 with force to avoid damaging the threaded probe 2. Then, screw the threaded probe 2 back 1 / 3 to 4 / 3 of a turn so that the cutting surface on the threaded probe 2 is aligned at 90 degrees with the metal limit strip on the gearbox.

[0042] Then screw the compression nut 6 along the threaded probe 2 until the double-cone sealing ring 8 fits with the top chamfer of the gear box threaded hole, and tighten it with a torque wrench. Then screw the locking nut 5 along the threaded probe 2 until the O-ring 7 fits with the top chamfer of the compression nut 6, and finally tighten it with a torque wrench with a tightening torque of 40 N.m. The speed sensor is now installed.

[0043] Through the above-mentioned arrangement of the utility model, not only can the speed sensor be installed on the threaded hole of the low-floor vehicle bogie gearbox with the smallest installation size through only one through hole, but also the traditional speed sensor is abandoned. The mode of using three through holes for installation and positioning can greatly simplify the operation procedures and reduce the difficulty of operation. At the same time, the metal limit card strip on the bogie gearbox is matched with the cutting surface on the threaded probe to fix the speed sensor on the bogie gearbox threaded hole, thereby ensuring that the two-way signal output by the speed sensor meets the customer's phase difference requirements. Finally, after the speed sensor is installed, the clamping nut is tightened along the speed sensor speed probe until the double-cone sealing ring is engaged. It fits with the chamfer on the top of the gearbox threaded hole, and then is tightened with a torque wrench. The locking nut is then screwed in along the speed sensor probe until the O-ring fits with the chamfer on the top of the compression nut, and is tightened with a torque wrench with a tightening torque of 40 N.m. The O-ring and the double-cone sealing ring are respectively subjected to the compression force generated when the locking nut and the compression nut are tightened, and expand. The double-cone sealing ring covers and seals the contact part between the top chamfer of the bogie gearbox threaded hole and the threaded probe, and the O-ring covers and seals the contact part between the locking nut and the compression nut, thereby finally achieving sealing between the speed sensor and the bogie gearbox, and the sealing performance between the two reaches IP68.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A speed sensor, characterized in that: It comprises a circuit board (1) and a threaded probe (2); The circuit board (1) is fixedly arranged in the threaded probe (2) and passes through the interior of the threaded probe (2) to align with the speed measuring gear (15) for speed measurement; the threaded probe (2) is screwed into the threaded hole (16.1) on the gear box (16) on which the speed measuring gear (15) is installed through an external thread; A limiting cutting surface (2.1) is further provided on the outer surface of the threaded probe (2); a limiting clamping strip (16.2) matching the limiting cutting surface (2.1) is further fixedly provided on the gear box (16); the limiting cutting surface (2.1) is aligned with the limiting clamping strip (16.2) and is used to limit the installation angle of the threaded probe (2).

2. A speed sensor according to claim 1, characterized in that: The threaded probe (2) is also threadedly connected with a locking nut (5) and a compression nut (6), the compression nut (6) is arranged to abut against the gear box (16), and the locking nut (5) and the compression nut (6) are arranged to abut against each other, and are used to press the threaded probe (2) into the threaded hole (16.1).

3. A speed sensor according to claim 2, characterized in that: The chamfered end of the compression nut (6) is arranged toward the locking nut (5); an O-ring (7) for sealing is also provided between the locking nut (5) and the compression nut (6).

4. A speed sensor according to claim 3, characterized in that: A double-cone sealing ring (8) is also provided between the compression nut (6) and the gear box (16).

5. A speed sensor according to claim 4, characterized in that: The locking nut (5) and the compression nut (6) are also coated with Sicardin sealing putty (12).

6. A speed sensor according to claim 1, characterized in that: A heat-conducting epoxy encapsulating material (9) is also filled between the circuit board (1) and the threaded probe (2) to fix the circuit board (1) inside the threaded probe (2).

7. A speed sensor according to claim 1, characterized in that: It also includes a connecting pipeline, which includes a bellows (10) and hose connectors (4) arranged at both ends of the bellows (10); The threaded probe (2) is also threadedly connected to a threaded adapter (3), and the threaded adapter (3) is connected to a hose connector (4).

8. A speed sensor according to claim 7, characterized in that: One end of the bellows (10) is connected to the threaded probe (2) through a hose connector (4) and a threaded adapter (3); the other end is connected to the connector plug (13) through the hose connector (4); The cable (11) on the circuit board (1) passes through the threaded adapter (3) and the connecting pipe in sequence and is electrically connected to the connector plug (13).

9. A speed sensor according to claim 8, characterized in that: Also included is a connector socket (14) that matches the connector plug (13).

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