CN114483357B

CN114483357B - Motorcycle engine

Info

Publication number: CN114483357B
Application number: CN202111600140.9A
Authority: CN
Inventors: 刘浏; 李术林; 夏勇; 程志明; 王平; 罗世业
Original assignee: Lifan Technology Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2024-02-27
Anticipated expiration: 2041-12-24
Also published as: CN114483357A

Abstract

The invention discloses a motorcycle engine, which comprises a cylinder head, wherein the cylinder head is provided with two groups of air inlet valves, and two groups of air inlet cams and two groups of air inlet rocker arms corresponding to the two groups of air inlet valves, and the key points of the engine are that: the cylinder head is provided with two groups of supporting seats, an air inlet cam shaft is rotatably assembled on the two groups of supporting seats, the two groups of air inlet cams are sleeved on the air inlet cam shaft, and one group of supporting seats is positioned between the two groups of air inlet cams; one end of the air inlet rocker arm is rotatably arranged on the cylinder head, and the other end of the air inlet rocker arm is arranged between the corresponding air inlet valve and the air inlet cam. The beneficial effects of the invention are as follows: the engine head portion has a more compact structure.

Description

Motorcycle engine

Technical Field

The invention relates to motorcycle parts, in particular to a motorcycle engine.

Background

The engine is used as a power output source of the motorcycle, and the comprehensive performance of the engine has a decisive effect on the competitiveness of the motorcycle in the market.

As is well known, the engine is complex in structure and involves a large number of parts. On the premise of ensuring basic transmission function, how to continuously improve the structural compactness of the engine is a research and development work of related enterprises. In particular the engine cylinder head portion, such as: in the cam rocker arm air inlet structure of the traditional double-air inlet cylinder, the acting points of the cam and the valve are symmetrically arranged at two ends of the rocker arm, and the distribution structure of the cam shaft supporting points can intangibly increase the outline dimension of the cylinder head, so that the engine is poor in compactness.

Disclosure of Invention

In view of the above, the present invention provides a motorcycle engine to solve the technical problems pointed out in the background art.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

the motorcycle engine comprises a cylinder head, wherein two groups of air inlet valves, two groups of air inlet cams and two groups of air inlet rocker arms corresponding to the two groups of air inlet valves are arranged on the cylinder head, and the key points of the engine are that: the cylinder head is provided with two groups of supporting seats, an air inlet cam shaft is rotatably assembled on the two groups of supporting seats, the two groups of air inlet cams are sleeved on the air inlet cam shaft, and one group of supporting seats is positioned between the two groups of air inlet cams; one end of the air inlet rocker arm is rotatably arranged on the cylinder head, and the other end of the air inlet rocker arm is arranged between the corresponding air inlet valve and the air inlet cam.

By adopting the structure, the force contact points of the air inlet valve and the air inlet cam with the air inlet rocker are arranged on the upper side and the lower side of the end part of the air inlet rocker, so that the length of the air inlet rocker can be shortened by almost half, and the length dimension of the cylinder head is reduced; meanwhile, the space between the two groups of air inlet valves is utilized as a supporting seat of the air inlet cam shaft, the supporting seat is prevented from being arranged at one end of the air inlet cam shaft, the width dimension of the cylinder head is shortened, and an assembly space is reserved for the cylinder body connecting bolt, so that the cylinder head structure is more compact.

As preferable: the cylinder head is provided with two groups of exhaust valves, two groups of exhaust cams and two groups of exhaust rocker arms corresponding to the two groups of exhaust valves, the two groups of exhaust cams are connected with an exhaust cam shaft which is rotationally assembled on the cylinder head, the upper end of the cylinder head is provided with a shaft bracket, and a joint surface between the shaft bracket and the cylinder head is obliquely arranged from the exhaust cam shaft to the air inlet cam shaft. And an air inlet channel is arranged at one end of the cylinder head, which is close to the air inlet cam shaft.

By adopting the structure, the joint surface between the shaft bracket and the cylinder head is obliquely arranged, so that the length dimension of the cylinder head in the direction from the exhaust camshaft to the intake camshaft can be further shortened, and the structure of the cylinder head is more compact. Simultaneously, the inclination setting of faying face can also guarantee that the intake duct inclination of lateral part is steeper, forms a dive air flue, makes the engine intake more smooth and easy.

As preferable: the lower end of the shaft bracket is provided with two groups of arc-shaped positioning grooves corresponding to the supporting seat, the bottom of each arc-shaped positioning groove is provided with an oil groove, the shaft bracket is provided with an oil injection hole at a position corresponding to the upper part of the air inlet cam, and the shaft bracket is internally provided with an oil duct communicated with the oil groove and the oil injection hole.

As preferable: the cylinder head is provided with bolt holes at positions other than the end part of the corresponding air inlet cam shaft.

As preferable: an exhaust passage is arranged at one end of the cylinder head, which is close to the exhaust cam shaft, and an air compensating valve mounting hole is arranged at the end part of the exhaust passage. By adopting the structure, the air compensating valve can be directly arranged at the outlet position of the exhaust passage, the air compensating valve is prevented from being arranged on the cylinder head cover, and the structural compactness of the engine is further improved.

As preferable: the lower end of the cylinder head is provided with a downward extending sinking structure corresponding to the position of the engine combustion chamber. By adopting the structure, the sinking structure can compress the height space of the combustion chamber and improve the combustion power.

As preferable: the spark plug of the engine is arranged in an intermediate area surrounded by two groups of air inlet valves and two groups of air outlet valves. With the above structure, the ignition response can be made faster.

As preferable: the upper and lower sides of one end of the air inlet rocker arm are respectively provided with an upper convex cambered surface and a lower convex cambered surface, the upper convex cambered surface is in sliding contact with the air inlet cam, and the lower convex cambered surface is in sliding contact with the upper end of the air inlet valve. By adopting the structure, the working fluency of the cam rocker arm air inlet structure can be fully ensured.

Compared with the traditional double-air-inlet engine, the invention has the beneficial effects that:

in the cylinder head portion, both the length dimension and the width dimension are significantly reduced, and the engine has a more compact assembly structure.

Drawings

FIG. 1 is a schematic view of a cylinder head;

FIG. 2 is a top view of the cylinder head;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken along B-B in FIG. 3;

FIG. 5 is a schematic structural view of a shaft bracket;

fig. 6 is a bottom view of the cylinder head.

Detailed Description

The invention is further described below with reference to examples and figures.

As shown in fig. 1, as can be seen from fig. 4, a cylinder head 1 of a motorcycle engine is provided with two groups of air inlet valves 2, two groups of air inlet cams 3, two groups of air inlet rocker arms 4 and an air inlet cam shaft 5, the air inlet valves 2, the air inlet cams 3 and the air inlet rocker arms 4 are in one-to-one correspondence, the cylinder head 1 is provided with two groups of supporting seats 1a, the air inlet cam shaft 5 is rotatably mounted on the two groups of supporting seats 1a, the two groups of air inlet cams 3 are fixedly sleeved on the air inlet cam shaft 5, and besides a split assembly structure, an embodiment that the air inlet cams 3 are directly and integrally formed on the air inlet cam shaft 5 can be adopted between the air inlet cams 3 and the air inlet cam shaft 5. After the assembly of all parts in the cylinder head 1 is completed, one group of supporting seats 1a is positioned between the two groups of air inlet cams 3, and the group of supporting seats 1a is designed in the space between the two groups of air inlet cams 3, so that the supporting seats 1a are prevented from being arranged at one end of the air inlet cam shaft 5, the effect of shortening the width dimension of the cylinder head 1 is achieved, and the structure of the cylinder head 1 in the width direction is more compact.

As shown in fig. 1, 2 and 6, the cylinder head 1 is also provided with two groups of exhaust valves 6, two groups of exhaust cams 7, two groups of exhaust rocker arms 12 and one exhaust cam shaft 8, the exhaust valves 6, the exhaust cams 7 and the exhaust rocker arms 12 are in one-to-one correspondence, the rotation mounting mode of the exhaust cam shaft 8 and the intake cam shaft 5 on the cylinder head 1 is consistent, the effect of shortening the width dimension of the cylinder head 1 can be achieved, and the detailed structure is not repeated here.

Referring to fig. 2, bolt holes 1c are distributed in the cylinder head 1 at positions other than the ends corresponding to the intake camshaft 5 and the exhaust camshaft 8, and the cylinder body can be assembled and connected by bolts passing through the bolt holes 1 c. One group of supporting seats 1a is designed in the space between the two groups of air inlet cams 3, and the bolt holes 1c can be exposed, so that the assembly is convenient.

In order to facilitate the installation of the intake camshaft 5, the upper end of the cylinder head 1 is provided with a shaft bracket 9, as shown in fig. 5, the lower end of the shaft bracket 9 is provided with two groups of arc-shaped positioning grooves 9a corresponding to the supporting seats 1a one by one, and the arc-shaped positioning grooves 9a are of a semicircular structure, so that the intake camshaft 5 can be locked and attached at the upper end of the cylinder head 1. Further, as can be seen from fig. 3, the joint surface e between the shaft bracket 9 and the cylinder head 1 is obliquely arranged from the exhaust camshaft 8 to the intake camshaft 5, the end of the cylinder head 1 near the intake camshaft 5 is provided with the air inlet channel 1b, and the joint surface e is obliquely arranged to enable the right end of the cylinder head 1 to be higher than the left end, so that the air inlet channel 1b at the side part can be designed to be steeper, a diving air channel is formed, and the air inlet of the engine is smoother. In addition, the joint surface e is inclined, and the length of the cylinder head 1 in the direction from the exhaust camshaft 8 to the intake camshaft 5 can be further shortened, so that the cylinder head 1 can be made more compact.

As shown in fig. 4 and 5, the bottom of the arc-shaped positioning groove 9a is provided with an oil groove b, the shaft bracket 9 is provided with an oil injection hole c at a position corresponding to the upper part of the air inlet cam 3, and an oil duct a communicated with the oil groove b and the oil injection hole c is arranged in the shaft bracket 9.

As shown in fig. 3, one end of an intake rocker arm 4 is rotatably mounted on the cylinder head 1, and the other end is clamped between the intake valve 2 and an intake cam 3, and the intake cam 3 can drive the intake valve 2 to move linearly downwards through the intake rocker arm 4. By the design, the air inlet valve 2 and the air inlet cam 3 are positioned on the upper side and the lower side of the same end of the air inlet rocker arm 4, so that the length of the air inlet rocker arm 4 can be shortened by almost half, the length dimension of the cylinder head 1 is reduced, and the structural compactness of the motorcycle engine is improved. Further, the upper and lower sides at one end of the air inlet rocker arm 4 are respectively provided with an upper convex cambered surface 4a and a lower convex cambered surface 4b, the upper convex cambered surface 4a is in sliding contact with the air inlet cam 3, the lower convex cambered surface 4b is in sliding contact with the upper end of the air inlet valve 2, and the working fluency of the air inlet structure of the cam rocker arm can be fully ensured through the cambered surface contact.

As shown in fig. 3, an exhaust passage 1d is provided at one end of the cylinder head 1 near the exhaust camshaft 8, and an air compensating valve mounting hole 1e is provided at the end of the exhaust passage 1d for mounting an air compensating valve at the outlet of the exhaust passage 1 d. The lower end of the cylinder head 1 is provided with a sinking structure 1f extending downwards at a position corresponding to the combustion chamber of the engine, the sinking structure 1f can compress the height space of the combustion chamber, the combustion power is improved, and in the embodiment, the sinking depth of the sinking structure 1f is preferably 0.5mm. As can be seen from fig. 6, the spark plug 10 of the engine is installed in the middle area surrounded by the two sets of intake valves 2 and the two sets of exhaust valves 6, and the spark plug 10 is designed to be centered, so that the ignition response can be faster.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a motorcycle engine, includes cylinder end (1), be equipped with two sets of air inlet valve (2) on cylinder end (1), and with two sets of air inlet cams (3) and two sets of air inlet rocking arms (4) that correspond of air inlet valve (2), its characterized in that: two groups of supporting seats (1 a) are arranged on the cylinder head (1), an air inlet cam shaft (5) is rotatably assembled on the two groups of supporting seats (1 a), the two groups of air inlet cams (3) are sleeved on the air inlet cam shaft (5), and one group of supporting seats (1 a) is positioned between the two groups of air inlet cams (3); one end of the air inlet rocker arm (4) is rotatably arranged on the cylinder head (1), and the other end of the air inlet rocker arm is arranged between the corresponding air inlet valve (2) and the air inlet cam (3); the cylinder head (1) is provided with bolt holes (1 c) at positions except for the end part of the corresponding air inlet cam shaft (5);

two groups of exhaust valves (6), two groups of exhaust cams (7) corresponding to the two groups of exhaust valves (6) and two groups of exhaust rocker arms (12) are arranged on the cylinder head (1), the two groups of exhaust cams (7) are connected with an exhaust cam shaft (8) rotationally assembled on the cylinder head (1), a shaft bracket (9) is arranged at the upper end of the cylinder head (1), two groups of arc-shaped positioning grooves (9 a) which are in one-to-one correspondence with the supporting seats (1 a) are arranged at the lower end of the shaft bracket (9), the arc-shaped positioning grooves (9 a) are of semicircular structures, the air inlet cam shaft (5) can be locked at the upper end of the cylinder head (1), and a joint surface (e) between the shaft bracket (9) and the cylinder head (1) is obliquely arranged in the direction from the exhaust cam shaft (8) to the air inlet cam shaft (5), and one end, close to the air inlet passage (1 b) of the cylinder head (1), of the cylinder head (5);

an oil groove (b) is formed in the bottom of the arc-shaped positioning groove (9 a), an oil spraying hole (c) is formed in the position, corresponding to the upper part of the air inlet cam (3), of the shaft bracket (9), and an oil duct (a) communicated with the oil groove (b) and the oil spraying hole (c) is formed in the shaft bracket (9);

an exhaust passage (1 d) is arranged at one end of the cylinder head (1) close to the exhaust cam shaft (8), and an air compensating valve mounting hole (1 e) is arranged at the end part of the exhaust passage (1 d).

2. A motorcycle engine as claimed in claim 1, wherein: the lower end of the cylinder head (1) is provided with a downward extending sinking structure (1 f) corresponding to the position of the engine combustion chamber.

3. A motorcycle engine as claimed in claim 1, wherein: a spark plug (10) of the engine is arranged in an intermediate area surrounded by two groups of air inlet valves (2) and two groups of air outlet valves (6).

4. A motorcycle engine as claimed in claim 1, wherein: the upper side and the lower side of one end of the air inlet rocker arm (4) are respectively provided with an upper convex cambered surface (4 a) and a lower convex cambered surface (4 b), the upper convex cambered surface (4 a) is in sliding contact with the air inlet cam (3), and the lower convex cambered surface (4 b) is in sliding contact with the upper end of the air inlet valve (2).