Engine speed sensor

Abstract

The utility model belongs to the technical field of engine sensors, and particularly discloses an engine rotating speed sensor which comprises a fixing frame, the outer surface of the fixing frame is rotatably connected with a gear ring to be detected, a sensor magnet shell is fixedly arranged at the top of the fixing frame in a penetrating mode, and a soft iron core is arranged in the sensor magnet shell. An inductance coil is wound on the outer surface of the soft iron core, a fixing ring frame is arranged on the outer surface of the sensor magnet shell, a channel is formed in the fixing ring frame, and an automatic opening and closing mechanism is arranged on the fixing ring frame. According to the engine rotating speed sensor, a channel of the sensor can be closed when a vehicle stops by introducing a self-opening and closing mechanism and an improved sensor design, dust is prevented from entering the sensor, and dust is prevented from entering the sensor and being attached and accumulated on a soft iron core and an inductance coil in the long-term standing process of the vehicle; and the influence of dust on the sensor performance is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of engine sensors, and in particular to an engine speed sensor. Background Art

[0002] The engine speed sensor is a device used to measure the engine speed. It is usually installed on the crankshaft or camshaft of the engine and determines the engine speed by detecting the rotational motion of the crankshaft or camshaft.

[0003] The speed sensor consists of a permanent magnet as its shell, with a soft iron core and an inductor coil inside. Since the soft iron core and the inductor coil are connected to the outside world, dust will enter and adhere to the soft iron core and the inductor coil when the vehicle is stationary for a long time. The accumulation of dust affects the movement and signal transmission of the soft iron core and the inductor coil, resulting in a decrease in sensor performance, such as reduced accuracy of speed detection and affected stability of signal output. Utility Model Content

[0004] In view of this, the purpose of the present invention is to solve the shortcomings of the background technology and to propose an engine speed sensor to solve the problems in the prior art.

[0005] To achieve the above purpose, the utility model provides an engine speed sensor, including a fixing frame, the outer surface of the fixing frame is rotatably connected with a gear ring to be measured, a sensor magnet housing is fixedly penetrated on the top of the fixing frame, a soft iron core is arranged inside the sensor magnet housing, an inductor coil is wound around the outer surface of the soft iron core, a fixing ring frame is arranged on the outer surface of the sensor magnet housing, a channel is arranged on the fixing ring frame, and a self-opening and closing mechanism is arranged on the fixing ring frame. The positions of the speed sensor and the gear ring to be measured are strictly set, and only a very small gap is allowed between the gear ring and the sensor surface. During the speed measurement process of the speed sensor, when the gear ring to be measured is rotating, the induction teeth and the tooth gaps alternately pass under the sensor surface, and when the induction teeth approach and leave the sensor sensing element, the magnetic field of the sensor expands and contracts, and the change in the electric field triggers the change in the magnetic flux in the inductor coil, thereby forming an induced current in the inductor coil. The magnitude and direction of the current are determined by the speed of the gear ring. After processing, the speed of the wheel can be calculated.

[0006] Preferably, the self-opening and closing mechanism includes a gear ring frame rotatably connected to a fixed ring frame, and a plate shaft is fixedly connected to the top of the channel. The self-opening and closing mechanism can block and open the external channel of the speed sensor according to whether the vehicle is opened.

[0007] Preferably, an opening and closing plate is rotatably connected to the outer surface of the plate shaft, and an outer surface of the gear ring frame is fixedly connected to an outer shaft.

[0008] Preferably, the outer surface of the outer shaft is rotatably connected to a driving bar, the upper surface of the opening and closing plate is fixedly connected to the inner shaft, and the outer surface of the inner shaft is rotatably connected to an end of the driving bar away from the outer shaft.

[0009] Preferably, a motor is fixedly mounted on the fixed ring frame, a small gear ring is fixedly connected to the output end of the motor, and the outer surface of the small gear ring is meshingly connected to the outer surface of the gear ring frame.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] 1. The engine speed sensor, by introducing a self-opening and closing mechanism, has an improved sensor design that can close the sensor channel when the vehicle stops, preventing dust from entering the sensor. It also prevents dust from entering the sensor during long-term stationary state of the vehicle and accumulating on the soft iron core and inductor coil, thereby reducing the impact of dust on sensor performance.

[0012] 2. The sealing and unsealing process of the engine speed sensor is completely controlled by the self-opening and closing mechanism, and no manual intervention or operation is required. Once the vehicle stops running, the motor will start, and the self-opening and closing mechanism will automatically close the sensor channel to prevent dust from entering. When the vehicle starts, the self-opening and closing mechanism will automatically unseal the channel and restore the normal working state of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of this application;

[0014] Figure 2 This is a schematic diagram of the internal structure of the sensor for this application;

[0015] Figure 3 This is a schematic diagram of the internal structure of the fixed ring frame for this application;

[0016] Figure 4 This is a schematic diagram of the channel structure of this application.

[0017] Among them: 1. Fixed frame; 2. Measured gear ring; 3. Sensor magnet housing; 4. Soft iron core; 5. Inductor coil; 6. Fixed ring frame; 7. Channel; 8. Gear ring frame; 9. Plate shaft; 10. Opening and closing plate; 11. Outer bar shaft; 12. Driving bar; 13. Inner bar shaft; 14. Motor; 15. Small gear ring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] See also Figure 1-4 An engine speed sensor includes a fixing frame 1, the outer surface of which is rotatably connected to a gear ring 2 to be measured, a sensor magnet housing 3 is fixedly penetrated through the top of the fixing frame 1, a soft iron core 4 is arranged inside the sensor magnet housing 3, an inductor coil 5 is wound around the outer surface of the soft iron core 4, a fixing ring frame 6 is arranged on the outer surface of the sensor magnet housing 3, a channel 7 is arranged on the fixing ring frame 6, and a self-opening and closing mechanism is arranged on the fixing ring frame 6.

[0020] Through the above technical solution, the motor 14 of the speed sensor will be turned on synchronously when the vehicle starts, so that the channel 7 under the soft iron core 4 is in an open state through the self-opening and closing mechanism to facilitate normal speed sensing. After the vehicle stops, the channel 7 can be blocked by the multiple sets of opening and closing plates 10 in the self-opening and closing mechanism to prevent dust from entering.

[0021] Specifically, the self-opening and closing mechanism includes a gear ring frame 8 rotatably connected to a fixed ring frame 6 , and a plate shaft 9 is fixedly connected to the top of the channel 7 .

[0022] Through the above technical solution, the gear ring frame 8 will drive the outer bar shaft 11 to rotate synchronously during the rotation process, thereby pulling the driving bar 12.

[0023] Specifically, the outer surface of the plate shaft 9 is rotatably connected with the opening and closing plate 10 , and the outer surface of the gear ring frame 8 is fixedly connected with the outer shaft 11 .

[0024] Through the above technical solution, five groups of outer shafts 11 are designed, and the opening and closing plates 10 and other components related thereto are also arranged in the same number. When the five groups of opening and closing plates 10 are completely closed together, the entire channel 7 can be in a closed state.

[0025] Specifically, the outer surface of the outer shaft 11 is rotatably connected to the driving bar 12, the upper surface of the opening and closing plate 10 is fixedly connected to the inner shaft 13, and the outer surface of the inner shaft 13 is rotatably connected to the end of the driving bar 12 away from the outer shaft 11.

[0026] Through the above technical solution, the driving bar 12 can drive the opening and closing plate 10 through the inner bar shaft 13 during the swinging process, so that the opening and closing plate 10 rotates along the plate shaft 9.

[0027] Specifically, a motor 14 is fixedly mounted on the fixed ring frame 6 , and a small gear ring 15 is fixedly connected to the output end of the motor 14 . The outer surface of the small gear ring 15 is meshedly connected with the outer surface of the gear ring frame 8 .

[0028] Through the above technical solution, the motor 14 can drive the small gear ring 15 to rotate after being turned on, and then link the gear ring frame 8 to rotate.

[0029] Working principle: During the use of the device, the speed sensor measures the speed of the lowered gear ring 2. Considering that dust is easy to enter from the bottom of the sensor magnet housing 3 and accumulate on the soft iron core 4 and the inductor 5, a self-opening and closing mechanism is designed. When the vehicle stops, the motor 14 will be turned on synchronously. During this process, the small gear ring 15 will drive the gear ring frame 8 to rotate, and the outer shaft 11 on the gear ring frame 8 will perform circular motion synchronously, and the drive bar 12 will be pulled by the outer shaft 11, so that The driving bar 12 pulls the opening and closing plate 10 through the inner bar shaft 13, and the opening and closing plate 10 will rotate along the plate shaft 9 until the multiple groups of opening and closing plates 10 are completely fitted together in the process of closing together, thereby blocking the channel 7 to prevent dust from entering the sensor and reducing the impact on the sensor performance. When the vehicle starts, the motor 14 will drive the small gear ring 15 to rotate in the opposite direction, so that the gear ring frame 8 rotates in the opposite direction, that is, the opening and closing plates 10 are pulled away from each other, that is, the channel 7 is no longer blocked, and the normal speed measurement of the vehicle by the speed sensor will not be affected.

[0030] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An engine speed sensor, comprising a fixing frame (1), characterized in that: The outer surface of the fixed frame (1) is rotatably connected to the gear ring (2) to be measured, the top of the fixed frame (1) is fixedly penetrated with a sensor magnet housing (3), a soft iron core (4) is arranged inside the sensor magnet housing (3), an inductor (5) is wound around the outer surface of the soft iron core (4), a fixed ring frame (6) is arranged on the outer surface of the sensor magnet housing (3), a channel (7) is arranged on the fixed ring frame (6), and a self-opening and closing mechanism is arranged on the fixed ring frame (6).

2. The engine speed sensor according to claim 1, characterized in that: The self-opening and closing mechanism comprises a gear ring frame (8) rotatably connected to a fixed ring frame (6), and a plate shaft (9) is fixedly connected to the top of the channel (7).

3. The engine speed sensor according to claim 2, characterized in that: The outer surface of the plate shaft (9) is rotatably connected to an opening and closing plate (10), and the outer surface of the gear ring frame (8) is fixedly connected to an outer bar shaft (11).

4. The engine speed sensor according to claim 3, characterized in that: The outer surface of the outer shaft (11) is rotatably connected to a driving bar (12), the upper surface of the opening and closing plate (10) is fixedly connected to an inner shaft (13), and the outer surface of the inner shaft (13) is rotatably connected to an end of the driving bar (12) away from the outer shaft (11).

5. The engine speed sensor according to claim 1, characterized in that: A motor (14) is fixedly mounted on the fixed ring frame (6), and a small gear ring (15) is fixedly connected to the output end of the motor (14), and the outer surface of the small gear ring (15) is meshedly connected to the outer surface of the gear ring frame (8).

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