Air-cooled motorcycle engine cylinder head

Abstract

The utility model relates to a motorcycle engine, concretely is an air -cooled motorcycle engine cylinder head, including cylinder head body and camshaft support, cylinder head body and camshaft support are split type structure, be equipped with the cavity and chain cavity in cylinder head body, the outer wall of cylinder head body is equipped with multilayer fin structure, its characterized in that, be equipped with the heat dissipation rib in the cavity, and the whole structure is compact and the heat dissipation effect is good.

Description

Technical Field

[0001] This utility model relates to motorcycle engines, specifically an air-cooled motorcycle engine cylinder head. Background Technology

[0002] The market is increasingly demanding better cooling and lighter weight for motorcycles, which in turn places stricter requirements on engine design. For air-cooled motorcycle engines, the cylinder head is a key design element, as it bears most of the valve train components and must also ensure proper intake and exhaust functions. Simultaneously reducing valve train vibration and achieving engine weight reduction is a challenging task.

[0003] Existing document CN212003360U discloses an air-cooled motorcycle engine cylinder head, including a cylinder head body. An air intake is located at the upper part of the cylinder head body, an exhaust port at the lower part, and a combustion chamber at the front end. The air intake communicates with the combustion chamber through an intake passage, and the exhaust port communicates with the combustion chamber through an exhaust passage. The combustion chamber has an intake valve seat hole communicating with the intake passage and an exhaust valve seat hole communicating with the exhaust passage. The cylinder head body has cooling ribs located on the back of the combustion chamber, and the cooling ribs are arranged parallel to the line connecting the centers of the air intake and exhaust ports. In the above document, the cylinder head is a one-piece structure.

[0004] Existing document CN2789442Y discloses a single-cylinder, water-cooled, overhead split-type motorcycle engine cylinder head, which has a split camshaft mounting hole, cooling water passage, and exhaust passage. A secondary air intake passage is provided on the front side of the exhaust passage, and this secondary air intake passage communicates with the exhaust passage. The cylinder head in the aforementioned document is a split-type structure.

[0005] Both split-type and integral-type cylinder head structures have heat dissipation structures on the outer wall of the cylinder head body. However, the split-type cylinder head structure is more compact and small, and the heat dissipation structure on the outer wall has a small area, resulting in poor overall heat dissipation. Overheating of the cylinder head can lead to engine damage and other problems. Utility Model Content

[0006] This solution provides a cylinder head for an air-cooled engine with good heat dissipation, including a cylinder head body and a camshaft support. The cylinder head body and the camshaft support are separate structures. The cylinder head body has a cavity and a chain cavity. The outer wall of the cylinder head body has a multi-layer heat dissipation fin structure. The key feature is that the cavity has heat dissipation ribs.

[0007] For better heat dissipation, the heat dissipation ribs are textured heat dissipation ribs, and the heat dissipation ribs are located inside the cavity.

[0008] To make the overall structure of the cylinder head more stable, the camshaft bracket is located on the top of the cylinder head body, and transverse reinforcing ribs are provided between the exhaust ends of the camshaft bracket.

[0009] To facilitate the installation of the camshaft bracket, the top of the cylinder head body is provided with a large end and a small end of the camshaft for mounting the camshaft bracket, and mounting holes are provided on the large end and the small end of the camshaft.

[0010] To make the overall cylinder head structure more stable and reduce the vibration caused by the movement of the valve train, the transverse reinforcing rib is located between the large end and the small end of the camshaft.

[0011] To further enhance the airflow guidance effect and ensure heat dissipation, a cooling air duct is provided inside the cylinder head body. The air inlet of the cooling air duct is located on the side of the exhaust duct near the chain cavity. The cooling air duct passes through the area between the exhaust duct and the chain cavity and between the exhaust duct and the intake duct in sequence. The air outlet of the cooling air duct is connected to the spark plug mounting cavity.

[0012] To improve heat dissipation, the multi-layer heat sink structure is a stepped structure with a larger top and a smaller bottom.

[0013] Preferably, the multi-layer heat sink structure is distributed on the left and right sides of the outer wall of the cylinder head body and extends to the windward side and the leeward side of the cylinder head body, respectively.

[0014] This utility model has the following beneficial effects: 1. The cylinder head cavity is equipped with heat dissipation fins, which brings advantages to the design of the cylinder head structure strength, increases the contact area between the cylinder head body and the air, and improves the heat dissipation effect. The multi-layer heat dissipation fin structure is distributed in a stepped manner, which not only makes the cylinder head body structure compact, but also makes it lighter than the traditional square heat dissipation structure.

[0015] 2. The cylinder head body is also equipped with multiple reinforcing ribs, which connect the camshaft support through the compact internal structure, making the overall structure of the cylinder head more stable and reducing the vibration caused by the movement of the valve train. Attached Figure Description

[0016] Figure 1 This is a front three-view diagram of the cylinder head of an air-cooled motorcycle engine according to this utility model.

[0017] Figure 2 A schematic diagram of the camshaft bracket mounting structure.

[0018] Figure 3 This is a top view of the cylinder head body.

[0019] Figure 4 This is a schematic diagram of the cooling air duct structure.

[0020] Figure 5 This is a schematic diagram of the multi-layer heat sink structure of the cylinder head body. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: cylinder head body 1, cavity 101, mounting hole 102, camshaft bracket 2, exhaust end 201, reinforcing rib 3, cylinder head surface 4, cooling rib 5, chain cavity 6, camshaft large end 7, camshaft small end 8, intake manifold 9, exhaust manifold 10, air inlet 11, air outlet 12, and multi-layer heat sink structure 13.

[0022] Example 1 like Figure 1-5 As shown, a cylinder head for an air-cooled engine with good heat dissipation includes a cylinder head body 1, a camshaft support 2, and a cylinder head surface 4. The cylinder head body 1 and the camshaft support 2 are separate structures. The cylinder head body 1 has a cavity 101 and a chain cavity 6. The outer wall of the cylinder head body 1 is provided with a multi-layer heat dissipation fin structure 13. The cylinder head surface 4 is located on the top surface of the cylinder head body 1. The cavity 101 is provided with heat dissipation fins 5 on one side except for the chain cavity 6.

[0023] The heat dissipation rib 5 is a mesh heat dissipation rib 5, and the heat dissipation rib 5 is located inside the cavity 101.

[0024] The camshaft bracket 2 is located on the top of the cylinder head body 1, and a transverse reinforcing rib 3 is provided between the exhaust ends 201 of the camshaft bracket 2.

[0025] The top of the cylinder head body 1 is provided with a large end 7 and a small end 8 of the camshaft for mounting the camshaft bracket 2. The large end 7 and the small end 8 of the camshaft are provided with mounting holes 102 for connecting the camshaft bracket 2.

[0026] The transverse reinforcing rib 3 is located between the large end 7 and the small end 8 of the camshaft, making the overall structure of the cylinder head more stable and reducing the vibration caused by the movement of the valve train.

[0027] The cylinder head body 1 is provided with a cooling air duct inside. The air inlet 11 of the cooling air duct is located on the side of the exhaust duct 10 near the chain cavity 6. The cooling air duct passes through the area between the exhaust duct 10 and the chain cavity 6 and between the exhaust duct 10 and the intake duct 9 in sequence. The air outlet 12 of the cooling air duct is connected to the spark plug mounting cavity to enhance the airflow and ensure heat dissipation.

[0028] The multi-layer heat sink structure 13 is a stepped structure with a larger top and a smaller bottom.

[0029] The multi-layer heat sink structure 13 is distributed on the left and right sides of the outer wall of the cylinder head body 1 and extends to the windward side and the leeward side of the cylinder head body 1, respectively.

[0030] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics of the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model, without affecting the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A cylinder head for an air-cooled motorcycle engine, comprising a cylinder head body and a camshaft support, wherein the cylinder head body and the camshaft support are separate structures, the cylinder head body has a cavity and a chain cavity, and the outer wall of the cylinder head body has a multi-layer heat dissipation fin structure, characterized in that, The cavity is equipped with heat dissipation fins.

2. The air-cooled motorcycle engine cylinder head according to claim 1, characterized in that: The heat dissipation ribs are textured heat dissipation ribs, and the heat dissipation ribs are located inside the cavity.

3. The air-cooled motorcycle engine cylinder head according to claim 2, characterized in that: The camshaft bracket is located on top of the cylinder head body, and transverse reinforcing ribs are provided between the exhaust ends of the camshaft bracket.

4. The air-cooled motorcycle engine cylinder head according to claim 3, characterized in that: The top of the cylinder head body is provided with a large end and a small end of the camshaft for mounting the camshaft bracket, and mounting holes are provided on the large end and the small end of the camshaft.

5. The air-cooled motorcycle engine cylinder head according to claim 4, characterized in that: The transverse reinforcing rib is located between the large end and the small end of the camshaft.

6. The air-cooled motorcycle engine cylinder head according to claim 5, characterized in that: The cylinder head body is provided with a cooling air duct inside. The air inlet of the cooling air duct is located on the side of the exhaust duct near the chain cavity. The cooling air duct passes through the area between the exhaust duct and the chain cavity and between the exhaust duct and the intake duct in sequence. The air outlet of the cooling air duct is connected to the spark plug mounting cavity.

7. The air-cooled motorcycle engine cylinder head according to claim 6, characterized in that: The multi-layer heat sink structure is a stepped structure with a larger top and a smaller bottom.

8. The air-cooled motorcycle engine cylinder head according to claim 7, characterized in that: The multi-layer heat sink structure is distributed on the left and right sides of the outer wall of the cylinder head body and extends to the windward side and the leeward side of the cylinder head body, respectively.

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