An engine breathing system

Abstract

The present invention discloses an engine breathing system, including an oil-gas separator provided in a cylinder head cover above a cylinder block, a camshaft cavity connected to a crankcase at the bottom of the cylinder block on one side of the cylinder block, a tappet chamber provided on the top of the cylinder block, a tappet hole connected to the tappet chamber and the camshaft cavity provided in the cylinder block, and a tappet hole corresponding to the tappet chamber provided in the cylinder head at the top of the cylinder block. The engine breathing system of the present invention belongs to the field of engine technology, has a compact structure, and can effectively balance the oil and gas pressure inside the entire engine; the entire engine body is only provided with one oil-gas separator, which can separate the oil and gas in the crankcase and the cylinder head and discharge the gas, without the need to provide two oil-gas separators, thereby reducing the cost of engine manufacturing, achieving a good separation effect, and a compact structure of the entire engine body.

Description

Technical Field

[0001] The present invention relates to engine technology, and more particularly to an engine breathing system. Background Art

[0002] In the prior art, a breather is separately opened at the position of the cylinder crankcase, and a breather is also opened on the cylinder head cover. Therefore, the prior art requires two breathers, which does not meet the lean design requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. The purpose of the present invention is to provide an engine breathing system which has a compact structure and can effectively balance the oil and gas pressure inside the entire engine.

[0004] To achieve the above-mentioned purpose, the present invention provides an engine breathing system, including an oil-gas separator arranged in a cylinder head cover above a cylinder block, a camshaft cavity connected to a crankcase at the bottom of the cylinder block is arranged on one side of the cylinder block, a tappet chamber is arranged on the top of the cylinder block, a tappet hole connecting the tappet chamber with the camshaft cavity is arranged in the cylinder body, and a tappet hole corresponding to the tappet chamber is arranged in the cylinder head at the top of the cylinder block and passes through from top to bottom.

[0005] Furthermore, a balancing hole connecting the crankcase and the camshaft cavity is provided in the cylinder body.

[0006] Furthermore, the balancing hole is arranged on one side of the top wall of the crankcase.

[0007] Furthermore, the balancing hole is inclined outward and extends to the bottom of the camshaft cavity wall; the tappet hole is vertically extended in the cylinder body, and the tappet hole is vertically extended in the cylinder head.

[0008] Furthermore, the tappet chamber is a groove extending along the long direction of the top end of the cylinder body.

[0009] Beneficial Effects

[0010] Compared with the prior art, the engine breathing system of the present invention has the following beneficial effects:

[0011] (1) The engine breathing system has a compact structure and can effectively balance the oil and gas pressure inside the entire engine;

[0012] (2) In the breathing system of the engine, the oil and gas in the crankcase can enter the camshaft cavity to assist in lubricating the camshaft in the camshaft cavity, and finally enter the cylinder head cover, and are discharged from the engine body after being separated by the oil and gas separator. The entire engine body is only provided with one oil and gas separator, which can separate the oil and gas in the crankcase and the cylinder head and discharge the gas. There is no need to set up two oil and gas separators, which reduces the cost of engine manufacturing, has a good separation effect, and has a compact structure of the entire engine body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a front structural cross-sectional view of the engine breathing system of the present invention;

[0014] Figure 2 It is a side structural cross-sectional view of the engine breathing system of the present invention.

[0015] Among them: 1-cylinder block, 2-cylinder head, 3-cylinder head cover, 4-crankcase, 5-oil pan, 6-oil-gas separator, 7-camshaft cavity, 8-tappet chamber, 9-tappet hole, 10-tappet hole, 11-balance hole. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0017] See also Figure 1-Figure 2 An engine breathing system of the present invention includes an engine body, which includes a cylinder block 1, a cylinder head 2, a cylinder head cover 3 and an oil pan 5 connected to a crankcase 4. The engine body also includes an oil-gas separator 6 provided in the cylinder head cover 3 above the cylinder block 1, a camshaft cavity 7 connected to the crankcase 4 at the bottom of the cylinder block 1 is provided on one side of the cylinder block 1, a tappet chamber 8 is provided on the top of the cylinder block 1, a tappet hole 9 connecting the tappet chamber 8 with the camshaft cavity 7 is provided in the cylinder block 1, and a tappet hole 10 corresponding to the tappet chamber 8 is provided in the cylinder head 2 at the top of the cylinder block 1.

[0018] In the breathing system of the engine, the oil and gas in the crankcase 4 can enter the camshaft cavity 7 to assist in lubricating the camshaft in the camshaft cavity 7, and then the oil and gas in the camshaft cavity 7 can enter the tappet chamber 8 from the tappet hole 9, and then enter the tappet hole 10 of the cylinder head 2 from the tappet chamber 8, and finally enter the cylinder head cover 3, and are discharged from the engine body after being separated by the oil and gas separator 6. Only one oil and gas separator 6 is provided for the entire engine body, so that the oil and gas in the crankcase 4 and the cylinder head 2 are separated and the gas is discharged. There is no need to set up two oil and gas separators, which reduces the cost of engine manufacturing, has a good separation effect, and has a compact structure of the entire engine body.

[0019] The engine body is an engine with a mid-camshaft structure. The camshaft is in the middle of the engine cylinder block 1, that is, in the camshaft cavity 7 on one side of the middle of the cylinder block 1. This structural feature is fully utilized, including the camshaft cavity 7, tappet holes 9, tappet chambers 8, tappet holes 10, etc., to connect the oil and gas in the crankcase 4 with the oil and gas in the cylinder head cover 3, thereby balancing the oil and gas pressure inside the entire engine, and finally the gas is discharged through the oil-gas separator 6.

[0020] In this embodiment, a balancing hole 11 is provided in the cylinder block 1 to connect the crankcase 4 with the camshaft cavity 7 . The balancing hole 11 allows the oil and gas at the top of the crankcase 4 to flow into the camshaft cavity 7 .

[0021] In this embodiment, the balancing hole 11 is arranged on one side of the top wall of the crankcase 4, and the balancing hole 11 extends outwardly at an angle to the bottom of the wall of the camshaft cavity 7; the tappet hole 9 is vertically extended in the cylinder body 1, and the tappet hole 10 is vertically extended in the cylinder head 2.

[0022] In this embodiment, the tappet chamber 8 is a groove extending along the long direction of the top of the cylinder body 1. The tappet chamber 8 can accommodate the swinging tappet and has good adaptability. At the same time, the tappet chamber 8 can store a certain amount of lubricating oil, which will flow back downward into the camshaft cavity 7 to lubricate the camshaft.

[0023] In the engine breathing system of the present invention arranged in the engine body, the oil and gas in the crankcase 4 reaches the camshaft cavity 7 through the balance hole 11, then reaches the tappet chamber 8 from the camshaft cavity 7 through the tappet hole 9, and then reaches the cylinder head cover 3 from the tappet chamber 8 through the tappet hole 10 on the cylinder head 2, and finally passes through the oil and gas separator 6 in the cylinder head cover 3 for filtration before the gas is discharged into the atmosphere. The whole process makes full use of the existing structural features of the engine, forms an upward passage between the cylinder head cover 3 and the crankcase 4, and at the same time makes full use of the principle of upward heat flow to connect the oil and gas in the crankcase 4 with the oil and gas in the cylinder head cover 3, thereby balancing the oil and gas pressure inside the entire engine, and finally discharges the gas through the oil and gas separator 6.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. An engine breathing system, comprising an oil-gas separator (6) provided in a cylinder head cover (3) above a cylinder block (1), characterized in that: A camshaft cavity (7) is provided on one side of the cylinder block (1) and is connected to a crankcase (4) at the bottom thereof; a tappet chamber (8) is provided on the top of the cylinder block (1); a tappet hole (9) is provided in the cylinder block (1) and connects the tappet chamber (8) with the camshaft cavity (7); a tappet hole (10) corresponding to the tappet chamber (8) is provided in the cylinder head (2) at the top of the cylinder block (1); a balancing hole (11) is provided in the cylinder block (1) and connects the crankcase (4) with the camshaft cavity (7); the balancing hole (11) extends outwardly and obliquely to the bottom of the wall of the camshaft cavity (7); the tappet hole (9) is vertically extended in the cylinder block (1); the tappet hole (10) is vertically extended in the cylinder head (2); and the tappet chamber (8) is a groove extending along the length direction at the top of the cylinder block (1).

2. An engine breathing system according to claim 1, characterized in that: The balancing hole (11) is arranged on one side of the top wall of the crankcase (4).

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