Camshaft structure of four-stroke gasoline engine

Abstract

The utility model discloses a camshaft structure of a four-stroke gasoline engine, which comprises a camshaft, a cam I, a cam II, a cam gear, a roller pin and a positioning baffle plate, and an engine oil channel, an oil pump transmission groove, an oil filling hole, a first oil outlet hole and a second oil outlet hole are arranged in the camshaft. The oil pump is driven to operate through the oil pump transmission groove in the cam shaft, the oil pump injects lubricating oil pumped out of the oil pool into the cam shaft through the oil injection hole and the engine oil channel in the cam shaft, and the lubricating oil injected into the cam shaft is transmitted to the cam gear and the cam shaft through the first oil outlet hole and the second oil outlet hole in the cam shaft. The cam gear controls the rotating speed of the cam shaft under different rotating speeds of linkage of the crankshaft gear, the speed and the capacity of lubricating oil pumped out of the oil pool by the oil pump are further controlled, lubrication of the gasoline engine under different working conditions is controlled through the rotating speed, engine oil consumption is reduced, and emission pollution is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of four-stroke gasoline engines, and particularly relates to a camshaft structure of a four-stroke gasoline engine. Background Technique

[0002] The current camshaft structure of a four-stroke gasoline engine usually functions for transmission. Through the linkage of the crankshaft gear of the gasoline engine, the opening and closing of the intake and exhaust valves of the four-stroke gasoline engine are controlled. During transmission, most of the components of the camshaft mechanism are in point or line contact with the follower, which is not easy to lubricate, prone to wear, requires frequent maintenance, and has a high usage cost. Summary of the Invention

[0003] The purpose of the utility model is to provide a camshaft structure for a four-stroke gasoline engine that is linked to an oil pump and provides a lubrication function according to speed. Its advantages are simple operation, convenient use, and improved working effect of engine oil lubrication.

[0004] The utility model realizes the above purpose through the following technical solutions:

[0005] A camshaft structure of a four-stroke gasoline engine includes a camshaft, a first cam, a second cam, a cam gear, a needle roller, and a positioning baffle. It is characterized in that: an engine oil channel, an oil pump drive groove, an oil injection hole, a first oil outlet hole, and a second oil outlet hole are arranged inside the camshaft; the cam gear drives the oil pump to operate through the oil pump drive groove on the camshaft under the linkage of the crankshaft gear, and the oil pump injects the lubricating oil pumped out from the oil sump into the camshaft through the oil injection hole and the engine oil channel on the camshaft.

[0006] Furthermore, the lubricating oil injected into the camshaft is transmitted to the cam gear and the camshaft through the first oil outlet hole and the second oil outlet hole on the camshaft.

[0007] Furthermore, the first cam, the second cam, and the cam gear are installed on the camshaft through the needle roller, and the camshaft is installed in the gasoline engine through the positioning baffle.

[0008] The beneficial effects are as follows: The camshaft mechanism structure for the four-stroke gasoline engine realizes several other significant functions while achieving the original effect of controlling the opening and closing of the intake and exhaust valves: one is to provide power for the oil pump to realize the oil suction and oil discharge of the oil pump; the second is that the self-provided oil transmission channel can lubricate itself and also provide lubrication for the engine body; the third is that the oil pump speed can be controlled according to the gasoline engine speed to control the outflow of engine oil, thereby reducing the engine oil consumption, which can not only reduce the usage cost of the gasoline engine but also greatly reduce the impact of harmful substances in the emissions on the environment. Description of the Drawings

[0009] The accompanying drawings described herein are used to provide a further understanding of the present utility model and form a part of the present utility model. The illustrative embodiments and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0010] Figure 1 is a schematic diagram of the external structure of the present utility model;

[0011] Figure 2 is a schematic diagram of the internal structure of the present utility model;

[0012] Figure 3 is a schematic diagram of the flow direction of lubricating oil in the oil passage;

[0013] Explanation of the numbers in the accompanying drawings: 1. Camshaft; 2. Cam; 3. Cam; 4. Cam gear; 5. Needle roller; 6. Positioning baffle; 7. Oil passage; 8. Oil pump drive slot; 9. Oil injection hole; 10. First oil outlet hole; 11. Second oil outlet hole; 12. Oil pump. Detailed implementation manners

[0014] It should be noted that the orientation terms that may be involved in the following paragraphs, including but not limited to "upper, lower, left, right, front, rear, inner, outer", etc., are based on the view orientations shown in the corresponding specification drawings. The purpose is only to facilitate those skilled in the art to better understand the technical solution of the present utility model, and it should not and should not be regarded as a limitation to the protection scope or technical solution of the present utility model.

[0015] In addition, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "assembly", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the creation of the present utility model can be understood according to specific circumstances.

[0016] The present utility model will be further described below with reference to the accompanying drawings.

[0017] As Figures 1 to 3As shown in the figure, a camshaft structure of a four-stroke gasoline engine includes a camshaft 1, a first cam 2, a second cam 3, a cam gear 4, a needle roller 5, and a positioning baffle 6. An oil passage 7, an oil pump drive groove 8, an oil injection hole 9, a first oil outlet hole 10, and a second oil outlet hole 11 are provided inside the camshaft 1. Driven by the crankshaft gear, the cam gear 4 drives the oil pump 12 to operate through the oil pump drive groove 8 on the camshaft 1. The oil pump 12 pumps the lubricating oil drawn from the oil sump and injects the oil into the camshaft 1 through the oil injection hole 9 and the oil passage 7 on the camshaft 1. The lubricating oil injected into the camshaft 1 is transmitted to the cam gear 4 and the camshaft 1 through the first oil outlet hole 10 and the second oil outlet hole 11 on the camshaft 1. The first cam 2, the second cam 3, and the cam gear 4 are installed on the camshaft 1 through the needle roller 5, and the camshaft 1 is installed in the gasoline engine through the positioning baffle 6.

[0018] When the present utility model is in use, the lubricating oil is thrown out again under the action of the centrifugal force generated by the rotation of the cam gear 4, increasing the atomization effect of the lubricating oil and making the lubrication effect more sufficient. At different rotational speeds driven by the crankshaft gear, the cam gear 4 controls the rotational speed of the camshaft 1, further controlling the rate and capacity of the lubricating oil pumped out by the oil pump 12 from the oil sump, and achieving sufficient lubrication of the gasoline engine under different working conditions through speed control, reducing the oil consumption and the impact of emissions on the environment.

[0019] The camshaft structure of the present utility model not only solves the power source of the oil pump, but also increases the lubrication degree of the structure at the location while satisfying its own sufficient lubrication. More prominently, the amount of lubricating oil can be controlled by the rotational speed, meeting the sufficient lubrication of the gasoline engine under different working conditions and different rotational speeds. The oil consumption of a common handheld four-stroke engine is about 6 g / kW·h, while the oil consumption of a handheld four-stroke engine adopting the structure of the present invention is only about 3 g / kW·h. The emissions of CH + NO X of a common handheld four-stroke engine are about (30 - 40) g / kW·h, while the emissions of CH + NO X of a handheld four-stroke engine adopting the structure of the present utility model are only (25 - 30) g / kW·h. The present utility model not only reduces the oil consumption and the use cost of the gasoline engine, but also greatly reduces the emissions of harmful substances.

[0020] Although the structure and method for implementing the present utility model are introduced in detail above, the present utility model is not limited thereto. Without departing from the technical idea and purpose of the present utility model, those skilled in the art can make variations in the shape, size, and other detailed structures of the described embodiments, and the variations made are still included in the present utility model.

Claims

1. A camshaft structure of a four-stroke gasoline engine, comprising a camshaft (1), a cam 1 (2), a cam 2 (3), a cam gear (4), a needle roller (5), and a positioning baffle (6), characterized in that: The camshaft (1) is provided with an oil passage (7), an oil pump transmission groove (8), an oil filling hole (9), a first oil outlet hole (10), and a second oil outlet hole (11); the cam gear (4) drives the oil pump (12) to operate through the oil pump transmission groove (8) on the camshaft (1) under the linkage of the crankshaft gear, and the oil pump (12) draws lubricating oil from the oil pool and injects the oil into the camshaft (1) through the oil filling hole (9) and the oil passage (7) on the camshaft (1).

2. The camshaft structure of a four-stroke gasoline engine according to claim 1, characterized in that: Lubricating oil is injected into the camshaft (1), and the lubricating oil is transmitted to the cam gear (4) and the camshaft (1) through a first oil outlet hole (10) and a second oil outlet hole (11) on the camshaft (1).

3. The camshaft structure of a four-stroke gasoline engine according to claim 1, characterized in that: The cam 1 (2), cam 2 (3), and cam gear (4) are mounted on the camshaft (1) via the needle roller (5), and the camshaft (1) is mounted in the gasoline engine via the positioning baffle (6).

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