An active speed sensor for engine speed signal monitoring

Abstract

This utility model discloses an active speed sensor for monitoring engine speed signals, including a sensor body and a top plate disposed on the sensor body. A protective shell is disposed at the bottom of the top plate, and support blocks are respectively disposed on the top of both sides of the protective shell. A shock-absorbing layer is disposed inside the protective shell, and a limiting frame is disposed at the bottom of the protective shell. A groove is disposed on the inner side of the limiting frame, and a baffle is disposed between the limiting frames. A protrusion is disposed on the outer side of the baffle, and a threaded block is disposed on the baffle. A mounting plate is disposed on one side of the limiting frame, and a micro motor is disposed on the mounting plate. A lead screw is disposed between the micro motor and the protective shell. The structure of this speed sensor can effectively prevent dust and foreign objects from entering the interior of the protective shell and affecting the monitoring accuracy of the sensor body on the measured gear ring, thereby improving the stability and reliability of the sensor speed signal monitoring.

Description

Technical Field

[0001] This utility model belongs to the technical field of speed sensors, specifically relating to an active speed sensor for monitoring engine speed signals. Background Technology

[0002] A speed sensor is a sensor that converts the rotational speed of a rotating object into an electrical output. Speed ​​sensors are indirect measurement devices and can be manufactured using mechanical, electrical, magnetic, optical, and hybrid methods. According to the different signal forms, speed sensors can be divided into analog and digital types. Speed ​​sensors have advantages such as high sensitivity, high reliability, long life, and long trigger distance, and are widely used in the field of automotive engines. An engine speed sensor is a device used to measure engine speed. It is usually installed on the crankshaft or camshaft of the engine and determines the engine speed by detecting the rotational movement of the crankshaft or camshaft. The speed sensor consists of a permanent magnet housing, with a soft iron core and an inductor coil inside.

[0003] However, since the existing sensor's soft iron core and inductor coil are in a state of communication with the outside world, dust can enter and adhere to the soft iron core and inductor coil during the long-term stationary process of the vehicle. The accumulation of dust affects the movement of the soft iron core and inductor coil and signal transmission, thus reducing the accuracy of speed detection. Utility Model Content

[0004] The purpose of this invention is to provide an active speed sensor for monitoring engine speed signals, in order to solve the problem mentioned in the background art that, since the soft iron core and inductor coil of the existing sensor are in a state of communication with the outside world, dust will enter and adhere to the soft iron core and inductor coil during the long-term static process of the vehicle. The accumulation of dust affects the movement of the soft iron core and inductor coil and the signal transmission, thus reducing the accuracy of speed detection.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an active speed sensor for monitoring engine speed signals, comprising a sensor body and a top plate disposed on the sensor body; A support plate is provided below the top plate, a fixing frame is provided at the bottom of the support plate, and a toothed ring to be tested is provided on the front of the fixing frame; The top plate has a protective shell at its bottom, and support blocks are provided on the top of both sides of the protective shell. A shock-absorbing layer is provided inside the protective shell. A limiting frame is provided at the bottom of the protective shell. A groove is provided on the inner side of the limiting frame. A baffle is provided between the limiting frames. A protrusion is provided on the outer side of the baffle. A threaded block is provided on the baffle. A mounting plate is provided on one side of the limiting frame. A micro motor is provided on the mounting plate. A lead screw is provided between the micro motor and the protective shell.

[0006] Preferably, the support block is welded to the protective shell, the support block is fixedly installed to the top plate by screws, the protective shell is fixedly installed to the top plate by the support block, the support block can provide certain support from both sides of the protective shell, and the protective shell can improve the impact resistance of the sensor body.

[0007] Preferably, the shock-absorbing layer is bonded and fixed to the protective shell. The shock-absorbing layer is made of rubber material and is used to fill the space between the protective shell and the sensor body. The shock-absorbing layer can prevent the sensor body from shaking inside the protective shell and maintain the stability of the sensor body.

[0008] Preferably, the limiting frame is fixedly installed to the bottom of the protective shell by screws, the protrusion and the baffle are integrally formed, the baffle slides in the groove on the limiting frame through the protrusion, and when the baffle slides to the bottom of the protective shell, it can close the bottom of the protective shell.

[0009] Preferably, the threaded block is welded to the baffle, the threaded block is provided with a threaded hole, one end of the lead screw is rotatably connected to the protective shell, the lead screw is threadedly connected to the threaded block, and the rotation of the lead screw can drive the threaded block and the bottom baffle to slide within the limiting frame.

[0010] Preferably, the other end of the lead screw is fixedly connected to the output shaft of the micro motor, the mounting plate is welded to the limiting frame, and the micro motor is fixedly installed to the mounting plate by screws.

[0011] Preferably, during installation, the sensor body needs to be inserted into the top plate and the bottom protective shell in sequence. The sensor body is fixed to the top plate with screws, and the sensor body can measure the rotational speed of the gear ring under test below.

[0012] Compared with the prior art, this utility model provides an active speed sensor for monitoring engine speed signals, which has the following advantages: 1. By setting up support blocks, protective shells, and shock-absorbing layers, multiple protections and stable monitoring of the sensor are achieved. The support blocks rigidly connect the protective shell and the top plate from both sides to form a stable support structure. The protective shell effectively isolates the sensor body from direct impacts from external hard objects such as stones, preventing the probe from deforming and breaking due to collisions. The shock-absorbing layer uses the elastic properties of rubber materials to buffer vibration energy and suppress abnormal shaking of the sensor body inside the shell, thereby ensuring that the sensor and the measured gear ring maintain a stable relative position, significantly improving the accuracy and long-term stability of speed signal acquisition.

[0013] 2. By setting up a limiting frame, baffle, lead screw, threaded block, protrusion, groove and micro motor, when the micro motor drives the lead screw to move the threaded block laterally, the baffle slides smoothly through the cooperation of the protrusion and groove, dynamically adjusting the opening state of the protective shell, effectively preventing dust and foreign objects from entering the shell, ensuring that the sensor body is not interfered with by environmental dust and other pollutants, and improving the reliability and continuous stability of speed signal monitoring. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the protective shell structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the limiting outer frame structure of this utility model.

[0017] In the diagram: 1. Sensor body; 2. Top plate; 3. Protective shell; 4. Support block; 5. Support plate; 6. Test gear ring; 7. Fixing frame; 8. Shock-absorbing layer; 9. Lead screw; 10. Threaded block; 11. Micro motor; 12. Mounting plate; 13. Baffle; 14. Limiting frame; 15. Groove; 16. Protrusion. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] This utility model provides, for example Figure 1-3 An active speed sensor for monitoring engine speed signals is shown, comprising a sensor body 1 and a top plate 2 disposed on the sensor body 1. A support plate 5 is provided below the top plate 2, a fixing frame 7 is provided at the bottom of the support plate 5, and a toothed ring 6 to be tested is provided on the front of the fixing frame 7; The top plate 2 is provided with a protective shell 3 at the bottom. Support blocks 4 are provided on the top of both sides of the protective shell 3. A shock-absorbing layer 8 is provided inside the protective shell 3. A limiting frame 14 is provided at the bottom of the protective shell 3. A groove 15 is provided on the inner side of the limiting frame 14. A baffle 13 is provided between the limiting frames 14. A protrusion 16 is provided on the outer side of the baffle 13. A threaded block 10 is provided on the baffle 13. A mounting plate 12 is provided on one side of the limiting frame 14. A micro motor 11 is provided on the mounting plate 12. A lead screw 9 is provided between the micro motor 11 and the protective shell 3.

[0020] In this embodiment, the engine speed sensor is a device used to measure engine speed. It is usually installed on the crankshaft or camshaft of the engine. The engine speed is determined by detecting the rotational movement of the crankshaft or camshaft. The speed sensor is used as follows: the sensor body 1 is fixedly installed with the top plate 2 and the support plate 5. The fixing bracket 7 at the bottom of the support plate 5 firmly fixes the entire sensor in an appropriate position, so that the sensing end of the sensor body 1 maintains a suitable gap with the measured gear ring 6. When the measured gear ring 6 rotates with the engine shaft, its tooth structure will periodically change the magnetic field around the sensor. The sensor body 1 detects these magnetic field changes and converts them into electrical signals, thereby monitoring the engine speed signal in real time. The entire installation structure ensures that the sensor can stably and accurately collect speed signals during engine operation.

[0021] like Figure 1 and Figure 2 As shown, the support block 4 is welded to the protective shell 3. The support block 4 is fixed to the top plate 2 by screws. The protective shell 3 is fixed to the top plate 2 by the support block 4. The support block 4 can provide certain support from both sides of the protective shell 3. The protective shell 3 can improve the impact resistance of the sensor body 1. The shock-absorbing layer 8 is bonded and fixed to the protective shell 3. The shock-absorbing layer 8 is made of rubber material. The shock-absorbing layer 8 is used to fill the space between the protective shell 3 and the sensor body 1. The shock-absorbing layer 8 can prevent the sensor body 1 from shaking inside the protective shell 3 and maintain the stability of the sensor body 1.

[0022] Preferably, by setting up the support block 4, the protective shell 3, and the shock-absorbing layer 8, the support block 4 can stably support the protective shell 3 from both sides, making it rigidly connected to the top plate 2. The protective shell 3 provides an outer layer of protection for the sensor body 1, preventing hard objects such as stones from easily getting into the groove of the measured gear ring 6 during vehicle operation. When the measured gear ring 6 rotates, it will cause the stones and other hard objects to collide with the sensor body 1, which may cause the probe of the speed sensor body 1 to deform and break. The shock-absorbing layer 8 absorbs vibration energy through the elastic properties of the rubber material, reducing the shaking of the sensor body 1 inside the protective shell 3, ensuring the stability between the sensor body 1 and the measured gear ring 6, thereby improving the accuracy and stability of speed signal monitoring.

[0023] like Figure 2 and Figure 3As shown, the limiting frame 14 is fixedly installed to the bottom of the protective shell 3 by screws. The protrusion 16 and the baffle 13 are integrally formed. The baffle 13 slides in the groove 15 on the limiting frame 14 through the protrusion 16. When the baffle 13 slides to the bottom of the protective shell 3, it can close the bottom of the protective shell 3. The threaded block 10 is welded to the baffle 13. The threaded block 10 is provided with a screw hole. One end of the screw rod 9 is rotatably connected to the protective shell 3. The screw rod 9 is threadedly connected to the threaded block 10. The rotation of the screw rod 9 can drive the threaded block 10 and the bottom baffle 13 to slide in the limiting frame 14. The other end of the screw rod 9 is fixedly connected to the output shaft of the micro motor 11. The mounting plate 12 is welded to the limiting frame 14. The micro motor 11 is fixedly installed to the mounting plate 12 by screws. When installing, the sensor body 1 needs to be inserted into the top plate 2 and the bottom protective shell 3 in sequence. The sensor body 1 is fixed to the top plate 2 by screws. The sensor body 1 can measure the rotation speed of the gear ring 6 under test below.

[0024] Preferably, by setting up the limiting frame 14, baffle 13, lead screw 9, threaded block 10, protrusion 16, groove 15 and micro motor 11, when the micro motor 11 drives the lead screw 9 to rotate, it can drive the threaded block 10 to move laterally along the lead screw 9, so that the baffle 13 can slide smoothly in the groove 15 through the protrusion 16, realizing the automatic opening and closing function of the bottom of the protective shell 3. This structure can effectively prevent dust and foreign objects from entering the interior of the protective shell 3 and affecting the monitoring accuracy of the sensor body 1 on the measured gear ring 6, thereby improving the stability and reliability of the sensor speed signal monitoring.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An active speed sensor for monitoring engine speed signals, comprising a sensor body (1) and a top plate (2) disposed on the sensor body (1). A support plate (5) is provided below the top plate (2), a fixing frame (7) is provided at the bottom of the support plate (5), and a toothed ring (6) to be tested is provided on the front of the fixing frame (7). characterized in that The top plate (2) is provided with a protective shell (3) at the bottom. Support blocks (4) are provided on the top of both sides of the protective shell (3). A shock-absorbing layer (8) is provided inside the protective shell (3). A limiting frame (14) is provided at the bottom of the protective shell (3). A groove (15) is provided on the inner side of the limiting frame (14). A baffle (13) is provided between the limiting frames (14). A protrusion (16) is provided on the outer side of the baffle (13). A threaded block (10) is provided on the baffle (13). An installation plate (12) is provided on one side of the limiting frame (14). A micro motor (11) is provided on the installation plate (12). A lead screw (9) is provided between the micro motor (11) and the protective shell (3).

2. An active speed sensor for engine speed signal monitoring according to claim 1, characterized in that: The support block (4) is welded to the protective shell (3). The support block (4) is fixedly installed to the top plate (2) by screws. The protective shell (3) is fixedly installed to the top plate (2) by the support block (4). The support block (4) can provide certain support from both sides of the protective shell (3). The protective shell (3) can improve the collision resistance of the sensor body (1).

3. The active speed sensor for monitoring engine speed signals according to claim 2, characterized in that: The shock-absorbing layer (8) is bonded and fixed to the protective shell (3). The shock-absorbing layer (8) is made of rubber material. The shock-absorbing layer (8) is used to fill the space between the protective shell (3) and the sensor body (1). The shock-absorbing layer (8) can prevent the sensor body (1) from shaking inside the protective shell (3) and maintain the stability of the sensor body (1).

4. An active speed sensor for engine speed signal monitoring according to claim 3, characterized in that: The limiting frame (14) is fixedly installed to the bottom of the protective shell (3) by screws. The protrusion (16) and the baffle (13) are integrally formed. The baffle (13) slides in the groove (15) on the limiting frame (14) through the protrusion (16). When the baffle (13) slides to the bottom of the protective shell (3), the bottom of the protective shell (3) can be closed.

5. An active speed sensor for engine speed signal monitoring according to claim 4, characterized in that: The threaded block (10) is welded to the baffle (13). The threaded block (10) is provided with a threaded hole. One end of the screw (9) is rotatably connected to the protective shell (3). The screw (9) is threadedly connected to the threaded block (10). The rotation of the screw (9) can drive the threaded block (10) and the baffle (13) at the bottom to slide within the limiting frame (14).

6. An active speed sensor for engine speed signal monitoring according to claim 5, characterized in that: The other end of the lead screw (9) is fixedly connected to the output shaft of the micro motor (11), the mounting plate (12) is welded to the limiting frame (14), and the micro motor (11) is fixedly installed to the mounting plate (12) by screws.

7. An active speed sensor for engine speed signal monitoring according to claim 1, characterized in that: When the sensor body (1) is installed, it needs to be inserted into the top plate (2) and the bottom protective shell (3) in sequence. The sensor body (1) is fixed on the top plate (2) by screws. The sensor body (1) can measure the rotation speed of the gear ring (6) under test below.

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