Engine gear integrated camshaft signal acquisition mechanism

Abstract

The utility model relates to a camshaft signal acquisition mechanism, in particular to an engine gear integrated camshaft signal acquisition mechanism, which comprises a sensor fixing bolt, a gasket, a cam phase sensor, a gear chamber cover, a flange face bolt, a camshaft gear, a gear chamber and a camshaft. The cam shaft penetrates through a mounting hole formed in the gear chamber; the cam shaft gear is fastened on the cam shaft through four flange face bolts; the gear chamber cover covers the gear chamber and is mounted together with the gear chamber through a mounting bolt; according to the utility model, the engine can be selectively provided with fuel pumps with various speed ratios, so that different matching requirements are met; according to the utility model, the distribution diameter of the signal teeth is large, the gap between the signal teeth is large, the collected signal is more stable and accurate, and the change of parts is less.

Description

Technical Field

[0001] The utility model relates to a camshaft signal acquisition mechanism, in particular to an engine gear-integrated camshaft signal acquisition mechanism. Background Art

[0002] With the improvement of national environmental protection requirements, more stringent non-road emission regulations have been introduced. In order to meet the requirements of lower emissions and fuel consumption, modern engines generally use electronically controlled high-pressure common rail fuel systems; electronically controlled high-pressure common rail fuel systems need to collect crankshaft speed signals when working to identify the engine operating speed and the engine top dead center position, and also need to collect cam phase signals to determine the engine ignition top dead center and accurately control the engine fuel injection timing; the cam phase signal needs to be collected from a shaft with a speed of half the crankshaft speed. There are currently two commonly used layouts. One is to add a cam phase signal disk in front of the fuel pump gear for collection, but the working speed of this fuel pump must be half the engine speed, which limits the selection of the fuel pump; the other is to arrange a model disk on the shaft diameter of the camshaft. This type of signal disk has a small diameter, the collected signal is unstable, and is easily interfered with. The camshaft is difficult to manufacture and has high cost. Therefore, in response to the above problems, it is necessary to design and provide a camshaft signal collection mechanism that does not limit the selection of fuel pumps, has a reasonable signal disk size, a small number of parts, low cost, and collects stable camshaft phase signals. Utility Model Content

[0003] The utility model aims to provide a camshaft signal acquisition mechanism integrated with engine gears, which has a scientific overall structural design, integrates the camshaft signal teeth and the camshaft gears together, has a simple overall structure, low production and processing costs and stable signal acquisition.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A camshaft signal acquisition mechanism integrated with engine gears, comprising a sensor fixing bolt, a gasket, a cam phase sensor, a gear chamber cover, a flange bolt, a camshaft gear, a gear chamber and a camshaft, wherein a mounting hole is provided on the gear chamber, and the camshaft passes through the mounting hole provided on the gear chamber; the camshaft gear is fastened to the camshaft by four flange bolts; the gear chamber cover is covered on the gear chamber and installed with the gear chamber by mounting bolts; a cam phase sensor is arranged on the gear chamber cover, and the cam phase sensor is installed on the gear chamber cover by means of sensor fixing bolts and gaskets.

[0006] Furthermore, a pin hole I is provided on the camshaft gear, a pin hole II corresponding to the pin hole I is provided on the camshaft, and positioning pins are installed in the pin hole I and the pin hole II to establish an accurate phase relationship between the camshaft gear and the camshaft.

[0007] Furthermore, six cam signal teeth are arranged in the circumferential direction of the camshaft gear, and the six cam signal teeth are evenly arranged in the circumferential direction of the camshaft gear.

[0008] Furthermore, a cam signal multi-tooth is arranged in the circumferential direction of the camshaft gear, and an angle c between the cam signal multi-tooth and its nearest adjacent cam signal tooth is 15°±0.5°.

[0009] Furthermore, a crankshaft gear matching mark point is arranged on the camshaft gear.

[0010] Furthermore, the camshaft gear and the crankshaft gear are assembled at matching mark points, the angle between the crankshaft gear matching mark point and the cam signal multi-tooth is a, and the angle b between the cam signal multi-tooth and the cam phase sensor is 20.5°±0.5°.

[0011] Furthermore, a distance d from the head of the cam phase sensor to the end surface of the cam signal tooth is 0.8 mm to 1.0 mm to ensure the stability of the cam phase sensor signal.

[0012] The beneficial effects of the utility model are as follows: the overall structural design of the camshaft signal acquisition mechanism integrated with the engine gear of the utility model is scientific. Compared with the existing camshaft signal acquisition mechanism structure, the camshaft signal acquisition mechanism of the utility model can, through the coordinated action of components such as the cam phase sensor, the gear chamber cover, the camshaft gear, the gear chamber, the locating pin and the camshaft, enable the engine to be equipped with fuel pumps with various speed ratios, thereby meeting the needs of different matching; at the same time, compared with the previous camshaft shaft diameter integrated signal teeth, the signal teeth in the utility model have a large distribution diameter, a large gap between the signal teeth, the collected signal is more stable and accurate, and the parts are less modified, the structure is simple, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the exploded assembly of the camshaft signal acquisition mechanism of the utility model;

[0014] Figure 2 This is a schematic diagram of the front-end assembly structure of the camshaft signal acquisition mechanism of the utility model;

[0015] Figure 3 for Figure 2 AA section view;

[0016] The numbers in the figure are: 1. Sensor fixing bolt, 2. Gasket, 3. Cam phase sensor, 4. Gear chamber cover, 5. Flange face bolt, 6. Camshaft gear, 7. Gear chamber, 8. Locating pin, 9. Camshaft, 6.1. Cam signal multi-tooth, 6.2. Cam signal tooth, 6.3. Crankshaft gear matching mark point. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly or indirectly connected to the other element. When an element is referred to as "connected to" another element, it can be directly or indirectly connected to the other element. The terms "left" and "right" used to indicate orientation in this application document are based on the specific structure shown in the accompanying drawings and do not constitute a limitation on the structure.

[0018] Specific embodiment 1: As shown in the specification of the utility model Figure 1 , Instruction Manual Figure 2 As shown, the utility model provides an engine gear integrated camshaft signal acquisition mechanism, which mainly includes a sensor fixing bolt 1, a gasket 2, a cam phase sensor 3, a gear chamber cover 4, a flange surface bolt 5, a camshaft gear 6, a gear chamber 7 and a camshaft 9. A mounting hole is provided on the gear chamber 7. During installation, the camshaft 9 passes through the mounting hole provided on the gear chamber 7. At the same time, the camshaft gear 6 is fastened to the camshaft 9 by four flange surface bolts 5; the gear chamber cover 4 covers the gear chamber 7 and is installed together with the gear chamber 7 by means of mounting bolts; a cam phase sensor 3 for detecting signals is arranged on the gear chamber cover 4, and the cam phase sensor 3 is installed on the gear chamber cover 4 by means of the sensor fixing bolt 1 and the gasket 2.

[0019] As the specification in this utility model Figure 2 As shown, in order to ensure that the camshaft gear 6 and the camshaft 9 establish an accurate phase relationship, a pin hole I is opened on the camshaft gear 6, and a pin hole II corresponding to the pin hole I is opened on the camshaft 9. Positioning pins 8 are installed in the pin holes I and II to ensure that the camshaft gear 6 and the camshaft 9 establish an accurate phase relationship.

[0020] As the specification in this utility model Figure 1 , Instruction Manual Figure 2As shown, six cam signal teeth 6.2 are evenly arranged in the circumferential direction of the camshaft gear 6, and a cam signal multi-tooth 6.1 is arranged at the same time, and the angle c between the cam signal multi-tooth 6.1 and one of the cam signal teeth 6.2 is 15°±0.5°. In addition, a camshaft gear and crankshaft gear matching mark point 6.3 is arranged on the camshaft gear 6, and a cam phase sensor 3 is arranged on the gear chamber cover 4. The cam phase sensor 3 is installed on the gear chamber cover 4 through the sensor fixing bolts 1 and the gasket 2; when the camshaft gear 4 and the crankshaft gear are assembled according to the crankshaft gear matching mark point 6.3, when the crankshaft rotates to the compression top dead center position, the angle b between the cam signal multi-tooth 6.1 and the cam phase sensor 3 can be made to be 20.5°±0.5° by reasonably adding up the angle a between the crankshaft gear matching mark point 6.3 and the cam signal multi-tooth 6.1. When the utility model is used in a specific way, when the engine runs to the ignition top dead center, the crankshaft gear is aligned with the camshaft gear mark 6.3, and the cam phase sensor 3 first detects the cam signal tooth 6.2, and then detects the cam signal multi-tooth 6.1 after 15°, and then detects 20.5°. At this time, the ECU determines that this is the engine ignition top dead center through this signal.

[0021] As the specification in this utility model Figure 3 As shown, in order to ensure the stability of the cam phase sensor signal, the distance from the head of the cam phase sensor 3 to the end face of the cam signal tooth 6.2 needs to be controlled during installation. During specific installation, the distance d from the head of the cam phase sensor 3 to the end face of the cam signal tooth is controlled between 0.8mm and 1.0mm to ensure the stability of the cam phase sensor signal.

[0022] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. An engine gear integrated camshaft signal acquisition mechanism, characterized in that: The invention comprises a sensor fixing bolt (1), a gasket (2), a cam phase sensor (3), a gear chamber cover (4), a flange face bolt (5), a camshaft gear (6), a gear chamber (7) and a camshaft (9); a mounting hole is provided on the gear chamber (7), and the camshaft (9) passes through the mounting hole provided on the gear chamber (7); the camshaft gear (6) is fastened to the camshaft (9) by four flange face bolts (5); the gear chamber cover (4) covers the gear chamber (7) and is installed with the gear chamber (7) by means of mounting bolts; a cam phase sensor (3) is arranged on the gear chamber cover (4), and the cam phase sensor (3) is installed on the gear chamber cover (4) by means of the sensor fixing bolt (1) and the gasket (2).

2. The engine gear integrated camshaft signal acquisition mechanism according to claim 1, characterized in that: A pin hole I is provided on the camshaft gear (6), a pin hole II corresponding to the pin hole I is provided on the camshaft (9), and positioning pins (8) are installed in the pin holes I and II to establish an accurate phase relationship between the camshaft gear (6) and the camshaft (9).

3. The engine gear integrated camshaft signal acquisition mechanism according to claim 2, characterized in that: Six cam signal teeth (6.2) are arranged in the circumferential direction of the camshaft gear (6), and the six cam signal teeth (6.2) are evenly arranged in the circumferential direction of the camshaft gear (6).

4. The engine gear integrated camshaft signal acquisition mechanism according to claim 3, characterized in that: A cam signal multi-tooth (6.1) is also arranged in the circumferential direction of the camshaft gear (6), and the angle c between the cam signal multi-tooth (6.1) and the nearest adjacent cam signal tooth (6.2) is 15°±0.5°.

5. The engine gear integrated camshaft signal acquisition mechanism according to claim 4, characterized in that: A crankshaft gear matching mark point (6.3) is arranged on the camshaft gear (6).

6. The engine gear integrated camshaft signal acquisition mechanism according to claim 5, characterized in that: The camshaft gear (6) is assembled with the crankshaft gear matching mark point (6.3), the included angle between the crankshaft gear matching mark point (6.3) and the cam signal multi-tooth (6.1) is a, and the included angle b between the cam signal multi-tooth (6.1) and the cam phase sensor (3) is 20.5°±0.5°.

7. The engine gear integrated camshaft signal acquisition mechanism according to claim 3, characterized in that: The distance d from the head of the cam phase sensor (3) to the end surface of the cam signal tooth (6.2) is 0.8 mm to 1.0 mm, so as to ensure the stability of the cam phase sensor signal.

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