Timing gear transmission mechanism of engine

Abstract

The utility model provides an engine timing gear transmission mechanism, and belongs to the technical field of engines. Comprising a crankshaft gear, an idle gear, a camshaft gear and an air compressor gear which are meshed in sequence, the modulus of the gear set is 1.5, the number of teeth of the crankshaft gear is 43, the number of teeth of the idle gear is 75, the number of teeth of the camshaft gear is 86, the number of teeth of the air compressor gear is 73, and the contact ratio of the crankshaft gear is 2.97. On the premise that the original engine structure is not changed, the modulus of the gear set is reduced, and the number of teeth of gears such as crankshaft gears is increased, so that the overlap ratio of the crankshaft gears is improved, the operation noise of a timing gear train is reduced, and the quality of the whole engine is improved. Meanwhile, as the center distance of the gear train in the original diesel engine is not changed, the natural gas engine can be refitted after the gear of the original diesel engine is directly replaced, and the effects of quiet operation and good universality are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine timing gear transmission mechanism. Background Art

[0002] Engine is a machine that can convert other forms of energy into mechanical energy. In the fields of vehicles and industry, the engine is the power center of the equipment, transmitting the converted mechanical energy to various parts of the equipment through transmission methods such as belts.

[0003] At present, agricultural machinery, trucks, and other vehicles usually use more economical diesel engines. In order to meet the gear strength requirements, the original diesel engine uses a gear set with a module of 2.5, a crankshaft gear with 26 teeth, an idler gear with 45 teeth, a camshaft gear with 52 teeth, an air compressor gear with 43 teeth, and a crankshaft gear overlap of 2.35. However, with the emphasis on pollution issues, some equipment has also switched to natural gas engines fueled by natural gas. The timing gear system in the natural gas engine no longer has a high-pressure oil pump, and the driving load is half of the original diesel engine. Continuing to use the original gear matching design will increase the operating noise between the gears and affect the quality of the entire engine. Utility Model Content

[0004] In view of the above problems, the utility model provides an engine timing gear transmission mechanism.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the utility model is as follows:

[0006] Provided is an engine timing gear transmission mechanism, comprising a gear set arranged at one end of the engine, the gear set comprising a crankshaft gear, an idler gear, a camshaft gear and an air compressor gear meshed in sequence;

[0007] The crankshaft gear is connected to the crankshaft in the engine, the idler gear is rotatably arranged on the engine, the camshaft gear is connected to the camshaft in the engine, and the air compressor gear is connected to the air compressor in the engine;

[0008] The module of the gear set is 1.5, the number of teeth on the crankshaft gear is 43, the number of teeth on the idler gear is 75, the number of teeth on the camshaft gear is 86, the number of teeth on the air compressor gear is 73, and the crankshaft gear overlap is 2.97.

[0009] Furthermore, the crankshaft gear, the idler gear, the camshaft gear and the air compressor gear are all helical gears.

[0010] Furthermore, the crankshaft gear, idler gear, camshaft gear and air compressor gear are all made of 40Cr material.

[0011] Furthermore, a plurality of filling cavities are spaced apart along the circumference of the idle gear, an oil outlet connected to the filling cavity is provided in the tooth groove of the idle gear, the filling cavity is filled with an oil-soaked sponge, and a filling port connected to the filling cavity and used for placing the oil-soaked sponge is provided on the outer wall of the idle gear.

[0012] Furthermore, two circles of filling cavities are coaxially arranged on the idle gear, and two adjacent circles of filling cavities are staggered with each other.

[0013] The beneficial effects of the utility model are: under the premise of not changing the original engine structure, the gear set module is reduced, the number of teeth of the crankshaft gear and other gears is increased, thereby improving the overlap of the crankshaft gear, thereby reducing the running noise of the timing gear train and improving the quality of the entire engine. At the same time, since the structure does not change the center distance of the gear train in the original diesel engine, the original diesel engine gear can be directly replaced and converted into a natural gas engine, which has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the engine timing gear transmission mechanism of an embodiment of the present application.

[0015] Figure 2 This is a schematic diagram of the overall structure of the idler gear according to an embodiment of the present application.

[0016] Figure 3 This is a schematic diagram of the overall structure of the idle gear after the oil-soaked sponge is removed from the embodiment of the present application.

[0017] Among them, 1. crankshaft gear; 2. idler gear; 21. oil outlet; 22. oil-soaked sponge; 23. filling port; 24. filling chamber; 3. camshaft gear; 4. air compressor gear. DETAILED DESCRIPTION

[0018] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] The present application embodiment discloses an engine timing gear transmission mechanism, referring to Figure 1 , including a crankshaft gear 1, an idler gear 2, a camshaft gear 3 and an air compressor gear 4, the crankshaft gear 1 is connected to the crankshaft in the engine, the idler gear 2 is rotatably set on the engine, the camshaft gear 3 is connected to the camshaft in the engine, and the air compressor gear 4 is connected to the air compressor in the engine, and the crankshaft gear 1, the idler gear 2, the camshaft gear 3 and the air compressor gear 4 are meshed in sequence.

[0020] In the embodiment of the present application, the module of the gear set is 1.5, the number of teeth of crankshaft gear 1 is 43, the number of teeth of idler gear 2 is 75, the number of teeth of camshaft gear 3 is 86, the number of teeth of air compressor gear 4 is 73, and the overlap degree of crankshaft gear 1 is 2.97.

[0021] Under the premise of not changing the original engine structure, the gear set module is reduced, and the number of teeth of gears such as crankshaft gear 1 is increased, thereby increasing the overlap of crankshaft gear 1, thereby reducing the running noise of the timing gear train and improving the quality of the entire engine. At the same time, since this structure does not change the center distance of the gear train in the original diesel engine, it can directly replace the original diesel engine gear and be converted into a natural gas engine, with good versatility.

[0022] Specifically, the crankshaft gear 1 , the idler gear 2 , the camshaft gear 3 and the air compressor gear 4 are all made of 40Cr material, and the crankshaft gear 1 , the idler gear 2 , the camshaft gear 3 and the air compressor gear 4 are all helical gears.

[0023] Reference Figure 2 and Figure 3 Furthermore, in order to maintain the transmission lubrication between the gear trains and thereby reduce the friction noise between the teeth, in the embodiment of the present application, a plurality of filling cavities 24 are provided in the idle gear 2 along its own circumferential intervals, an oil outlet 21 connected to the filling cavity 24 is provided in the tooth groove of the idle gear 2, the filling cavity 24 is filled with an oil-soaked sponge 22, and a filling port 23 connected to the filling cavity 24 and used to place the oil-soaked sponge 22 is provided on the outer wall of the idle gear 2. During the operation of the idle gear 2, the lubricating oil absorbed by the oil-soaked sponge 22 in the filling cavity 24 is squeezed into the oil outlet 21 by centrifugal force, so that the lubricating oil can accurately flow into the tooth groove of the idle gear 2 and the top of the teeth of the crankshaft gear 1 and the camshaft gear 3 meshing with the idle gear 2, thereby improving the lubrication effect on the gear train, and the lubricating oil can be sprayed into the filling port 23 through the oil spray head inside the engine to be absorbed by the oil-soaked sponge 22.

[0024] Two circles of filling cavities 24 are coaxially disposed on the idle gear 2 , and two adjacent circles of filling cavities 24 are staggered with each other, so that more oil outlets 21 can be opened on the idle gear 2 and the structure of the idle gear 2 is kept stable.

[0025] Furthermore, the filling port 23 is arranged on the side of the filling cavity 24 close to the center of the idle gear 2, so that the filling cavity 24 forms a receiving groove for receiving the oil-soaked sponge 22 on the side away from the center of the idle gear 2, and the oil-soaked sponge 22 can be stably received therein during the rotation of the idle gear 2.

[0026] It should be understood by those skilled in the art that, although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An engine timing gear transmission mechanism, characterized in that: The invention comprises a gear set arranged at one end of the engine, wherein the gear set comprises a crankshaft gear (1), an idler gear (2), a camshaft gear (3) and an air compressor gear (4) which are meshed in sequence; The crankshaft gear (1) is connected to a crankshaft in an engine, the idler gear (2) is rotatably arranged on the engine, the camshaft gear (3) is connected to a camshaft in the engine, and the air compressor gear (4) is connected to an air compressor in the engine; The module of the gear set is 1.5, the number of teeth of the crankshaft gear (1) is 43, the number of teeth of the idler gear (2) is 75, the number of teeth of the camshaft gear (3) is 86, the number of teeth of the air compressor gear (4) is 73, and the overlap degree of the crankshaft gear (1) is 2.

97.

2. An engine timing gear transmission mechanism according to claim 1, characterized in that: The crankshaft gear (1), the idler gear (2), the camshaft gear (3) and the air compressor gear (4) are all helical gears.

3. An engine timing gear transmission mechanism according to claim 2, characterized in that: The crankshaft gear (1), the idler gear (2), the camshaft gear (3) and the air compressor gear (4) are all made of 40Cr material.

4. The engine timing gear transmission mechanism according to claim 1, characterized in that: The idle gear (2) has a plurality of filling cavities (24) spaced apart along its circumference, the tooth groove of the idle gear (2) has an oil outlet (21) connected to the filling cavity (24), the filling cavity (24) is filled with an oil-soaked sponge (22), and the outer wall of the idle gear (2) has a filling port (23) connected to the filling cavity (24) and used to place the oil-soaked sponge (22).

5. An engine timing gear transmission mechanism according to claim 4, characterized in that: The idle gear (2) is coaxially provided with two circles of filling cavities (24), and two adjacent circles of the filling cavities (24) are staggered with each other.

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