Slope type air-cooled motorcycle engine cylinder head

Abstract

The utility model discloses a slope type air-cooled motorcycle engine cylinder head which comprises a cylinder head body, an air outlet channel opening, an air supplementing opening, an air inlet channel opening, a suspension seat and a plurality of cooling fins. A top cover sealing surface of the cylinder head main body is an inclined surface; the air outlet opening is formed in the middle of the left side of the cylinder head body, and the air supplementing opening is formed in the side, facing the top cover sealing face, of the air outlet opening; the air inlet opening is formed in the middle of the right side of the cylinder head body, and the hanging base is arranged on the side, facing the top cover sealing face, of the air inlet opening. The multiple cooling fins are arranged outside the cylinder head body in a surrounding mode, avoiding notches are formed in the positions, corresponding to the air outlet channel opening, the air supplementing port, the air inlet channel opening and the hanging base, of the multiple cooling fins, the multiple cooling fins are arranged at intervals in the vertical direction, and an air guide flow channel is formed between every two adjacent cooling fins. The heat dissipation structure is good in heat dissipation effect and beneficial to the space arrangement of the whole vehicle.

Description

Technical Field

[0001] The utility model relates to an engine, in particular to a sloped air-cooled motorcycle engine cylinder head. Background Art

[0002] The cylinder head of a motorcycle engine has a built-in combustion chamber. This design causes the cylinder head to be subjected to high temperatures during operation. In order to effectively manage this high temperature and prevent damage caused by overheating, cooling measures are usually taken for the cylinder head. These cooling measures mainly include air cooling and water cooling. Among them, air cooling usually uses natural wind or wind flow generated by a forced fan to take away the heat on the surface of the cylinder head to achieve a cooling effect. In addition, the existing technology will further improve the cooling effect by arranging heat sinks on the surface of the cylinder head and forming an air duct. However, since the surface of the cylinder head also needs to be arranged with multiple structures (such as air inlet ports, air outlet ports, etc.), the arrangement of the heat sinks is greatly affected, which is not conducive to heat exchange and the formation of air ducts. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a sloped air-cooled motorcycle engine cylinder head, which has good heat dissipation effect and is beneficial to the space layout of the whole vehicle.

[0004] The utility model discloses a sloped air-cooled motorcycle engine cylinder head, comprising a cylinder head body, an air outlet, an air supply port, an air inlet, a suspension seat and a plurality of heat sinks; the top cover sealing surface of the cylinder head body is a slope inclined downward from front to rear; the air outlet is arranged in the middle of the left side of the cylinder head body, and the air supply port is arranged on the side of the air outlet facing the top cover sealing surface; the air inlet is arranged in the middle of the right side of the cylinder head body, and the suspension seat is arranged on the side of the air inlet facing the top cover sealing surface; a plurality of heat sinks are all arranged around the outside of the cylinder head body, and a plurality of heat sinks are provided with avoidance notches corresponding to the positions of the air outlet, the air supply port, the air inlet and the suspension seat, and a plurality of heat sinks are arranged at intervals in the up and down directions, and an air guide channel is formed between two adjacent heat sinks.

[0005] Furthermore, the air supply port is at least partially higher than the lowest point height of the top cover sealing surface, and the suspension seat is at least partially higher than the lowest point height of the top cover sealing surface.

[0006] Furthermore, a camshaft seat is provided in the middle of the cylinder head body, and an exhaust rocker arm shaft hole, an intake rocker arm shaft hole and a first camshaft hole are provided on the camshaft seat. The exhaust rocker arm shaft hole and the intake rocker arm shaft hole are symmetrical to each other, and the axes of the exhaust rocker arm shaft hole, the intake rocker arm shaft hole and the first camshaft hole are distributed in an isosceles inverted triangle.

[0007] Further, the distance between the axis of the first camshaft hole and the axis of the exhaust rocker arm shaft hole is 33.876 ± 0.2 mm; the distance between the axis of the first camshaft hole and the axis of the intake rocker arm shaft hole is 33.876 ± 0.2 mm; the distance between the axis of the exhaust rocker arm shaft hole and the axis of the intake rocker arm shaft hole is 53.4 ± 0.2 mm.

[0008] Further, a second camshaft hole is provided on the cylinder head body, the second camshaft hole is located on the front side of the first camshaft hole, the aperture of the first camshaft hole is 40 mm - 42 mm, and the aperture of the second camshaft hole is 32 mm - 35 mm.

[0009] Further, a combustion chamber is provided at the lower part of the cylinder head body, and a spark plug hole is also provided in the cylinder head body, and the axis of the spark plug hole extends to the middle of the combustion chamber.

[0010] Further, the included angle α between the axis of the spark plug hole and the lower end cylinder surface of the cylinder head is 47° - 50°.

[0011] Further, the included angle β between the upper end surface of the cylinder head body and the lower end cylinder surface of the cylinder head body is 25°.

[0012] Further, an exhaust valve guide, an intake valve guide, an exhaust valve seat ring, and an intake valve seat ring are also provided in the cylinder head body. The axes of the exhaust valve guide and the exhaust valve seat ring are both A, the axes of the intake valve guide and the intake valve seat ring are both B, and the vertical axis of the cylinder head body is C. Among them, the included angle γ between A and C is 24°, and the included angle δ between B and C is 21°.

[0013] Further, two exhaust valve guides, two intake valve guides, two exhaust valve seat rings, and two intake valve seat rings are respectively provided.

[0014] The beneficial effects of the present utility model are as follows:

[0015] (1) The present utility model can ensure the penetration of the air guiding channel from the windward side to the leeward side, ensure the smooth flow path of the air flow, and thus improve the heat dissipation effect.

[0016] (2) The present utility model can reduce the influence of the air supplement port and the suspension seat on the heat dissipation fins and the air guiding channel, and further improve the heat dissipation effect.

[0017] (3) The present utility model is beneficial to reserve a matching space on the motorcycle and is beneficial to the overall vehicle space layout. Description of the Drawings

[0018] To make the objectives, technical solutions, and beneficial effects of the present utility model clearer, the following attached drawings are provided for illustration:

[0019] Figure 1 is a schematic structural view of the present utility model;

[0020] Figure 2 is a right view schematic of the present utility model;

[0021] Figure 3 is a cross-sectional view of the present utility model (along the axial plane of the intake and exhaust valve guides);

[0022] Figure 4 is a cross-sectional view of the present utility model (along the axial plane of the spark plug hole).

[0023] The markings in the attached drawings are as follows: 1 - cylinder head body, 2 - air outlet port, 3 - air supplement port, 4 - air inlet port, 5 - suspension seat, 6 - cooling fins, 7 - top cover sealing surface, 8 - camshaft seat, 9 - exhaust rocker arm shaft hole, 10 - intake rocker arm shaft hole, 11 - first camshaft hole, 12 - second camshaft hole, 13 - combustion chamber, 14 - spark plug hole, 15 - exhaust valve guide, 16 - intake valve guide, 17 - exhaust valve seat ring, 18 - intake valve seat ring. Specific Embodiments

[0024] The following details the technical solutions of the present utility model in conjunction with the attached drawings and embodiments.

[0025] As Figures 1-4 shown, a sloped air-cooled motorcycle engine cylinder head in this embodiment includes a cylinder head body 1, an air outlet port 2, an air supplement port 3, an air inlet port 4, a suspension seat 5, and a plurality of cooling fins 6; the top cover sealing surface 7 of the cylinder head body 1 is an inclined surface that slopes downward from front to back; the air outlet port 2 is provided in the middle of the left side of the cylinder head body 1, and the air supplement port 3 is provided on the side of the air outlet port 2 facing the top cover sealing surface 7; the air inlet port 4 is provided in the middle of the right side of the cylinder head body 1, and the suspension seat 5 is provided on the side of the air inlet port 4 facing the top cover sealing surface 7; a plurality of the cooling fins 6 are all arranged around the outside of the cylinder head body 1, and the plurality of cooling fins 6 are provided with avoidance notches corresponding to the positions of the air outlet port 2, the air supplement port 3, the air inlet port 4, and the suspension seat 5, the plurality of cooling fins 6 are arranged at intervals in the up and down direction, and a wind guiding flow channel is formed between adjacent two of the cooling fins 6.

[0026] The left side is the windward side during use, and the right side is the leeward side during use. That is: the air outlet 2 and the air supplement port 3 are arranged on the windward side, the air inlet 4 and the suspension seat 5 are arranged on the leeward side, and the air flow can blow from the windward side of the cylinder head body 1 to the front and back sides of the cylinder head body 1 along the air guiding channel formed by the heat sinks 6, and finally blow to the leeward side of the cylinder head body 1. Since the air outlet 2 and the air supplement port 3 are located in the middle of the windward side, and the air inlet 4 and the suspension seat 5 are located in the middle of the windward side, there will be no obstructive convex structures that interrupt the air guiding channel on the front and back sides of the cylinder head body 1. Therefore, the air outlet 2, the air supplement port 3, the air inlet 4 and the suspension seat 5 will not prevent the air flow from blowing from the windward side to the leeward side of the cylinder head body 1 along the air guiding channel, which can ensure the penetration of the air guiding channel from the windward side to the leeward side and ensure the smoothness of the air flow path, thereby improving the heat dissipation effect.

[0027] In addition, multiple heat sinks 6 are arranged at intervals in the up and down direction, and the length direction of the heat sink 6 is perpendicular to the up and down direction (that is, the length direction of the heat sink 6 is along the horizontal plane formed by the left and right directions and the front and back directions). Since the top cover sealing surface 7 of the cylinder head body 1 is an inclined surface that slopes downward from front to back, and the top cover sealing surface 7 is connected to the cylinder head, this inclined surface results in a smaller number of heat sinks 6 in the upper part of the cylinder head body 1 than in the lower part of the cylinder head body 1, and a smaller number of air guiding channels in the upper part of the cylinder head body 1 than in the lower part of the cylinder head body 1. Therefore, the heat dissipation effect in the upper part of the cylinder head body 1 is inferior to that in the lower part of the cylinder head body 1. The air supplement port 3 is located on the side of the air outlet 2 facing the top cover sealing surface 7, and the suspension seat 5 is located on the side of the air inlet 4 facing the top cover sealing surface 7, which can reduce the influence of the air supplement port 3 and the suspension seat 5 on the heat sinks 6 and the air guiding channels, and further improve the heat dissipation effect.

[0028] Moreover, the air outlet 2 is adjacent to the air supplement port 3, and the air inlet 4 is adjacent to the suspension seat 5, which is beneficial to reserve a matching space on the motorcycle and is beneficial to the overall vehicle space layout.

[0029] In this embodiment, at least a part of the air supplement port 3 is higher than the lowest point height of the top cover sealing surface 7, and at least a part of the suspension seat 5 is higher than the lowest point height of the top cover sealing surface 7. Preferably, most of the structure of the air supplement port 3 is higher than the lowest point height of the top cover sealing surface 7, and most of the structure of the suspension seat 5 is higher than the lowest point height of the top cover sealing surface 7, which can further reduce the influence of the air supplement port 3 and the suspension seat 5 on the heat sinks 6 and the air guiding channels.

[0030] In this embodiment, a camshaft seat 8 is provided in the middle of the cylinder head body 1. An exhaust rocker arm shaft hole 9, an intake rocker arm shaft hole 10, and a first camshaft hole 11 are provided on the camshaft seat 8. The exhaust rocker arm shaft hole 9 and the intake rocker arm shaft hole 10 are symmetric to each other. The axes of the exhaust rocker arm shaft hole 9, the intake rocker arm shaft hole 10, and the first camshaft hole 11 are distributed in an isosceles inverted triangle. In this embodiment, the distance between the axis of the first camshaft hole 11 and the axis of the exhaust rocker arm shaft hole 9 is 33.876 ± 0.2 mm, preferably 33.876 mm; the distance between the axis of the first camshaft hole 11 and the axis of the intake rocker arm shaft hole 10 is 33.876 ± 0.2 mm, preferably 33.876 mm; the distance between the axis of the exhaust rocker arm shaft hole 9 and the axis of the intake rocker arm shaft hole 10 is 53.4 ± 0.2 mm, preferably 53.4 mm.

[0031] The isosceles inverted triangle distribution of the exhaust rocker arm shaft hole 9, the intake rocker arm shaft hole 10, and the first camshaft hole 11 and the design of the hole pitch dimensions can effectively solve the abnormal valve movement in the single overhead camshaft rocker arm valve train, improve the smoothness of the second and third derivatives of the valve movement and the smallness of the jump, make the valve movement characteristics more conform to the initial design requirements of the cam profile, and have an obvious improvement effect on improving the stability of the valve train, increasing the engine power, and reducing the noise of the valve train.

[0032] In this embodiment, a second camshaft hole 12 is provided on the cylinder head body 1. The second camshaft hole 12 is located on the front side of the first camshaft hole 11. The aperture of the first camshaft hole 11 is 40 mm - 42 mm, preferably 41 mm. The aperture of the second camshaft hole 12 is 32 mm - 35 mm, preferably 33.5 mm.

[0033] The first camshaft hole 11 and the second camshaft hole 12 are coaxial, and the first camshaft hole 11 is larger. When machining the hole positions, it is not necessary to clamp multiple times, which is beneficial to improving the machining accuracy.

[0034] In this embodiment, a combustion chamber 13 is provided at the lower part of the cylinder head body 1. A spark plug hole 14 is also provided in the cylinder head body 1. The axis of the spark plug hole 14 extends to the middle of the combustion chamber 13. In this embodiment, the angle α between the axis of the spark plug hole 14 and the lower end cylinder surface of the cylinder head is 47° - 50°, preferably 48.5°.

[0035] The design of the combustion chamber 13 and the axis of the spark plug hole 14 is beneficial to the formation of the initial flame kernel and rapid combustion of the engine, thereby improving the economy.

[0036] In this embodiment, the included angle β between the upper end face of the cylinder head body 1 and the lower cylinder face of the cylinder head body 1 is 25°.

[0037] In this embodiment, it further includes an exhaust valve guide 15, an intake valve guide 16, an exhaust valve seat ring 17, and an intake valve seat ring 18 disposed in the cylinder head body 1. The axes of both the exhaust valve guide 15 and the exhaust valve seat ring 17 are A, the axes of both the intake valve guide 16 and the intake valve seat ring 18 are B, and the vertical axis of the cylinder head body 1 is C. Among them, the included angle γ between A and C is 24°, and the included angle δ between B and C is 21°. There is no valve interference phenomenon, that is, a reasonable valve timing can be designed. This small included angle intake and exhaust passage reduces the intake and exhaust resistance, thereby achieving the purpose of improving the filling efficiency and the engine power.

[0038] In this embodiment, there are two each of the exhaust valve guide 15, the intake valve guide 16, the exhaust valve seat ring 17, and the intake valve seat ring 18, so that this embodiment is a ramp-type air-cooled four-valve motorcycle cylinder head.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A sloped air-cooled motorcycle engine cylinder head, characterized in that: The invention comprises a cylinder head body (1), an air outlet (2), an air supply port (3), an air inlet (4), a suspension seat (5) and a plurality of heat sinks (6); the top cover sealing surface (7) of the cylinder head body (1) is an inclined surface inclined downward from front to rear; the air outlet (2) is arranged at the middle of the left side of the cylinder head body (1), the air supply port (3) is arranged at a side of the air outlet (2) facing the top cover sealing surface (7); the air inlet (4) is arranged at the cylinder head body (1) The suspension seat (5) is arranged at the middle of the right side of the air inlet (4) facing the top cover sealing surface (7); a plurality of the heat sinks (6) are arranged around the outside of the cylinder head body (1); the plurality of the heat sinks (6) are arranged with avoidance notches corresponding to the positions of the air outlet (2), the air supply port (3), the air inlet (4) and the suspension seat (5); the plurality of the heat sinks (6) are arranged at intervals in the up-down direction, and an air guide channel is formed between two adjacent heat sinks (6).

2. The sloped air-cooled motorcycle engine cylinder head according to claim 1, characterized in that: The air supply port (3) is at least partially higher than the lowest point height of the top cover sealing surface (7), and the suspension seat (5) is at least partially higher than the lowest point height of the top cover sealing surface (7).

3. The sloped air-cooled motorcycle engine cylinder head according to claim 1, characterized in that: A camshaft seat (8) is provided in the middle of the cylinder head body (1), and an exhaust rocker arm shaft hole (9), an intake rocker arm shaft hole (10) and a first camshaft hole (11) are provided on the camshaft seat (8); the exhaust rocker arm shaft hole (9) and the intake rocker arm shaft hole (10) are symmetrical to each other, and the axis of the exhaust rocker arm shaft hole (9), the axis of the intake rocker arm shaft hole (10) and the axis of the first camshaft hole (11) are distributed in the form of an isosceles inverted triangle.

4. The sloped air-cooled motorcycle engine cylinder head according to claim 3, characterized in that: The distance between the axis of the first camshaft hole (11) and the axis of the exhaust rocker arm shaft hole (9) is 33.876±0.2 mm; the distance between the axis of the first camshaft hole (11) and the axis of the intake rocker arm shaft hole (10) is 33.876±0.2 mm; and the distance between the axis of the exhaust rocker arm shaft hole (9) and the axis of the intake rocker arm shaft hole (10) is 53.4±0.2 mm.

5. The sloped air-cooled motorcycle engine cylinder head according to claim 4, characterized in that: The cylinder head body (1) is provided with a second camshaft hole (12), the second camshaft hole (12) being located in front of the first camshaft hole (11), the aperture of the first camshaft hole (11) being 40 mm-42 mm, and the aperture of the second camshaft hole (12) being 32 mm-35 mm.

6. The sloped air-cooled motorcycle engine cylinder head according to claim 1, characterized in that: A combustion chamber (13) is provided at the lower part of the cylinder head body (1), and a spark plug hole (14) is also provided in the cylinder head body (1), wherein the axis of the spark plug hole (14) extends to the middle part of the combustion chamber (13).

7. The sloped air-cooled motorcycle engine cylinder head according to claim 6, characterized in that: The included angle α between the axis of the spark plug hole (14) and the lower cylinder surface of the cylinder head is 47°-50°.

8. The sloped air-cooled motorcycle engine cylinder head according to claim 7, characterized in that: The included angle β between the upper end surface of the cylinder head body (1) and the lower end cylinder surface of the cylinder head body (1) is 25°.

9. The sloped air-cooled motorcycle engine cylinder head according to claim 1, characterized in that: It also includes an exhaust valve guide (15), an intake valve guide (16), an exhaust valve seat ring (17) and an intake valve seat ring (18) arranged in the cylinder head body (1), wherein the axes of the exhaust valve guide (15) and the exhaust valve seat ring (17) are both A, the axes of the intake valve guide (16) and the intake valve seat ring (18) are both B, and the vertical axis of the cylinder head body (1) is C, wherein the angle γ between A and C is 24°, and the angle δ between B and C is 21°.

10. The sloped air-cooled motorcycle engine cylinder head according to claim 9, characterized in that: The exhaust valve conduit (15), the intake valve conduit (16), the exhaust valve seat ring (17) and the intake valve seat ring (18) are each provided with two.

Images