Camshaft of engine of generator set

Abstract

The utility model discloses a generator set engine camshaft which comprises an air inlet cam and an exhaust cam which are arranged in the axial direction of the camshaft, and the exterior line of the air inlet cam comprises an air inlet cam base circle section and an air inlet cam working section which are connected end to end. The air inlet cam working section comprises an air inlet cam valve opening lift section and an air inlet cam valve closing lift section, the angle of the air inlet cam valve opening lift section ranges from 89 degrees to 180 degrees, the corresponding polar coordinate lift ranges from 0.00001 mm to 6.55 mm, the angle of the air inlet cam valve closing lift section ranges from 180 degrees to 271 degrees, and the corresponding polar coordinate lift ranges from 6.55 mm to 0.00003 mm. Through the optimized design of the cam, the stability of engine gas distribution is improved, and meanwhile operation noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of generator sets, in particular to a camshaft of a generator set engine. Background Art

[0002] The valve mechanism is the core part of the engine, and the valve cam profile design is one of the important ways to optimize the valve mechanism design. The rationality of its design is directly related to the power, economy and reliability of the engine. A good cam profile design can make full use of the intake inertia and improve the charging efficiency, thereby improving the performance of the engine. A poor cam profile design will lead to low engine charging efficiency, low power torque, poor lubrication between the cam and the tappet, abnormal wear of parts, and in severe cases, valve seat rebound and valve mechanism flying off. Therefore, designing a camshaft with a reasonable profile structure has become a hot topic in current research. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a generator set engine camshaft with stable valve timing and low noise.

[0004] The technical solution is as follows: a generator set engine camshaft, including an intake cam and an exhaust cam arranged along the axial direction of the camshaft, the main points of which are: the outer profile of the intake cam includes an intake cam base circle segment and an intake cam working segment connected end to end, the intake cam working segment includes an intake cam valve opening lift segment and an intake cam valve closing lift segment, the angle of the intake cam valve opening lift segment is 89°~180°, and the corresponding polar coordinate lift is 0.00001mm~6.55mm, the angle of the intake cam valve closing lift segment is 180°~271°, and the corresponding polar coordinate lift is 6.55mm~0.00003mm.

[0005] Preferably, the lift angle of the intake cam working section starts from 89° and ends at 271°, and the maximum lift of the intake cam is 6.55 mm.

[0006] As a preference, the lift table of the intake cam working section is as follows:

[0007]

[0008]

[0009]

[0010] Preferably, the outer profile of the exhaust cam includes an exhaust cam base circle segment and an exhaust cam working segment connected end to end, the exhaust cam working segment includes an exhaust cam valve opening lift segment and an exhaust cam valve closing lift segment, the angle of the exhaust cam valve opening lift segment is 89° to 180°, and the corresponding polar coordinate lift is 0.002mm to 6.3mm, the angle of the intake cam valve closing lift segment is 180° to 273°, and the corresponding polar coordinate lift is 6.3mm to 0.0003mm.

[0011] Preferably, the lift angle of the exhaust cam working section starts from 89° and ends at 273°, and the maximum lift of the intake cam is 6.3 mm.

[0012] As a preference, the lift table of the intake cam working section is as follows:

[0013]

[0014]

[0015]

[0016]

[0017] Beneficial effects: 1. The optimized design of the cam profile makes the engine's valve train more stable and greatly reduces the noise during operation;

[0018] 2. After optimization, the acceleration is reduced and the acceleration jump disappears;

[0019] 3. After optimization, the intake and exhaust cam flying off and valve bounce phenomena disappear. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the profile of the intake cam of the utility model;

[0021] Figure 2 It is a schematic diagram of the profile of the exhaust cam of the utility model. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with embodiments and drawings.

[0023] like Figure 1As shown, a camshaft of a generator engine includes an intake cam and an exhaust cam arranged along the axial direction of the camshaft, the outer profile of the intake cam includes an intake cam base circle section and an intake cam working section connected end to end, the intake cam working section includes an intake cam valve opening lift section and an intake cam valve closing lift section, the angle of the intake cam valve opening lift section is 89° to 180°, and the corresponding polar coordinate lift is 0.00001mm to 6.55mm, the angle of the intake cam valve closing lift section is 180° to 271°, and the corresponding polar coordinate lift is 6.55mm to 0.00003mm. The lift angle of the intake cam working section starts from 89° and ends at 271°, and the maximum lift of the intake cam is 6.55mm.

[0024] The lift table of the intake cam working section is as follows:

[0025]

[0026]

[0027]

[0028] See also Figure 2 The outer profile of the exhaust cam includes an exhaust cam base circle segment and an exhaust cam working segment connected end to end. The exhaust cam working segment includes an exhaust cam valve opening lift segment and an exhaust cam valve closing lift segment. The angle of the exhaust cam valve opening lift segment is 89° to 180°, and the corresponding polar coordinate lift is 0.002mm to 6.3mm. The angle of the intake cam valve closing lift segment is 180° to 273°, and the corresponding polar coordinate lift is 6.3mm to 0.0003mm. The lift angle of the exhaust cam working segment starts from 89° and ends at 273°, and the maximum lift of the intake cam is 6.3mm.

[0029] The lift table of the intake cam working section is as follows:

[0030]

[0031]

[0032]

[0033] The technical solution provided by the utility model solves the problems of the prior art that the positive acceleration peak value of the intake and exhaust cams is too large, resulting in jumping in the buffer section in front of the exhaust cam and flying off of the cam and the contact between the cam and the valve stop. After optimization: 1. The acceleration is reduced, the acceleration jump disappears, and the intake and exhaust cam flying off and valve rebound phenomena disappear; 2. After optimization, the maximum lift of the intake valve is about 6.55mm for intake and about 6.3mm for exhaust. The lift curves of the intake and exhaust valves are continuous and smooth and have no fluctuations at the closed position, and there is no valve rebound phenomenon; 3. After optimization, the flying off phenomenon disappears, and the maximum contact force of the cam is significantly reduced, with the maximum contact force of the intake being about 435N and that of the exhaust being about 407N.

[0034] Therefore, through the optimized design of the intake cam and the exhaust cam, the stability of the engine valve timing is improved and the operating noise is reduced.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. A camshaft for a generator engine, comprising an intake cam and an exhaust cam arranged along the axial direction of the camshaft, characterized in that: The outer profile of the intake cam includes an intake cam base circle section and an intake cam working section connected end to end. The intake cam working section includes an intake cam valve opening lift section and an intake cam valve closing lift section. The angle of the intake cam valve opening lift section is 89° to 180°, and the corresponding polar coordinate lift is 0.00001mm to 6.55mm. The angle of the intake cam valve closing lift section is 180° to 271°, and the corresponding polar coordinate lift is 6.55mm to 0.00003mm.

2. The camshaft of the generator engine according to claim 1, characterized in that: The lift angle of the intake cam working section starts from 89° and ends at 271°, and the maximum lift of the intake cam is 6.55mm.

3. The camshaft of the generator engine according to claim 2, characterized in that: The lift table of the intake cam working section is as follows:

4. The camshaft of the generator engine according to claim 1, characterized in that: The outer profile of the exhaust cam includes an exhaust cam base circle section and an exhaust cam working section connected end to end, the exhaust cam working section includes an exhaust cam valve opening lift section and an exhaust cam valve closing lift section, the angle of the exhaust cam valve opening lift section is 89° to 180°, and the corresponding polar coordinate lift is 0.002mm to 6.3mm, the angle of the intake cam valve closing lift section is 180° to 273°, and the corresponding polar coordinate lift is 6.3mm to 0.0003mm.

5. The camshaft of the generator engine according to claim 4, characterized in that: The lift angle of the exhaust cam working section starts from 89° and ends at 273°, and the maximum lift of the intake cam is 6.3mm.

6. The camshaft of the generator engine according to claim 5, characterized in that: The lift table of the intake cam working section is as follows:

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