Air-cooled motorcycle engine cylinder head

Abstract

The utility model relates to the technical field of motorcycle engines, and discloses an air-cooled motorcycle engine cylinder head, which comprises a cylinder head body, a chain cavity, a cam shaft support and a multi-layer radiating fin structure, and is characterized in that the multi-layer radiating fin structure is of a stepped structure, and a guide plate is arranged on the multi-layer radiating fin structure. And the heat dissipation effect is ensured while the size is lighter.

Description

TECHNICAL FIELD

[0001] The utility model relates to motorcycle engine technical field, concretely relates to a cylinder head of air -cooled motorcycle engine. BACKGROUND

[0002] As the key component of motorcycle engine, the cylinder head bears the functions of sealing combustion chamber, controlling valve, heat dissipation and installing key components (such as spark plug, camshaft) etc. At present, the market demand for heat dissipation effect and lightweight of motorcycle is increasing, and thus puts forward more strict requirements for the design of engine. For air-cooled motorcycle engine, the cylinder head is the key point of design, which bears most of the parts of valve train, and also needs to ensure the functions of intake and exhaust.

[0003] Chinese patent document CN221942580U discloses a motorcycle engine cylinder head, which comprises a cylinder head body, an air inlet, an air outlet, a spark plug mounting cavity and a timing chain cavity are arranged on the cylinder head body, a plurality of cooling fins are arranged on the outer side of the cylinder head body, the spark plug mounting cavity and the air outlet are located on the adjacent two sides of the cylinder head body, a cooling air duct is arranged in the cylinder head body, the air inlet of the cooling air duct is located on one side of the air outlet close to the timing chain cavity, the cooling air duct sequentially passes through the regions between the air outlet and the timing chain cavity and the air outlet and the air inlet, the air outlet of the cooling air duct is in communication with the spark plug mounting cavity, and a partition rib for dividing cooling airflow is arranged in the cooling air duct between the air inlet and the air outlet.

[0004] Chinese patent document CN213175848U discloses a double-cylinder air-cooled motorcycle engine cylinder head, which comprises cooling fins, the cooling fin assembly comprises air inlet cooling fins located on the air inlet face, air outlet cooling fins located on the air outlet face and two side cooling fins located between the air inlet face and the air outlet face; the air outlet cooling fins comprise two groups of first cooling fins, two groups of second cooling fins and a group of third cooling fins; the two groups of first cooling fins are respectively located on the outer sides of the first air outlet and the second air outlet, and the two groups of second cooling fins are respectively located on the top sides of the first air outlet and the second air outlet; the two groups of first cooling fins are symmetrically arranged with respect to the first air outlet and the second air outlet, the two groups of second cooling fins are symmetrically arranged with respect to the first air outlet and the second air outlet, and the third cooling fins are located on the lower sides between the first air outlet and the second air outlet; the horizontal cross-sectional area of each group of first cooling fins gradually increases from bottom to top, and the horizontal cross-sectional area of the third cooling fins gradually decreases from bottom to top.

[0005] In the prior art, the outer surface of the cylinder head is provided with multiple layers of cooling fins. During the driving of the motorcycle, the cooling fins enable the engine to dissipate heat quickly. In order to ensure the heat dissipation effect, the area and volume of the cooling fins are increased as much as possible, and thus the weight of the cylinder head is also increased, which does not meet the lightweight requirement of the cylinder head. UTILITY MODEL CONTENT

[0006] The utility model discloses in order to solve how to satisfy the technical problem of light weight requirement and guarantee the heat dissipation effect, provide a kind of air-cooled motorcycle engine cylinder head, including cylinder head body, chain cavity, two camshaft supports and multilayer fin structure, it is characterized in that, the multilayer fin structure is in ladder type structure, the multilayer fin structure is connected with the deflector near the wind side of the cylinder head body.

[0007] Preferably, the multilayer fin structure is also connected with the deflector on the leeward side of the cylinder head body.

[0008] Preferably, the deflector is inclined outward. The inclined deflector can actively "press" the airflow into the fin gap, preventing the airflow from deviating from the heat dissipation area due to inertia or external interference.

[0009] To avoid local overheating, the multilayer fin structure is in a ladder type structure with a large upper part and a small lower part. The upper part of the multilayer fin structure is closer to the high-temperature area of the engine combustion chamber, requiring more heat dissipation. The multilayer fin structure is larger at the top, allowing for faster heat dissipation.

[0010] To improve the heat dissipation effect, the multilayer fin structure is distributed on the left and right sides of the cylinder head body and extends to the windward and leeward sides of the cylinder head body, respectively.

[0011] Preferably, the chain cavity is located on the left side of the cylinder head body, and the slope of the multilayer fin structure on the left side is smaller than that on the right side.

[0012] To further reduce weight without affecting engine performance, a weight reduction groove is provided below the shaft hole of the cylinder head body, close to the intake and exhaust ports. The weight reduction groove is located on one side of the chain cavity.

[0013] To increase the stability of the internal structure of the cylinder head, two camshaft supports are located on the top of the cylinder head body, and a horizontal reinforcing rib is provided between the two camshaft supports.

[0014] Further, the camshaft support is connected to the cylinder head cover through a longitudinal reinforcing rib.

[0015] Further, a vertical reinforcing rib is provided on the longitudinal reinforcing rib, and the vertical reinforcing rib is attached to the camshaft support.

[0016] The utility model has the following beneficial effects:

[0017] 1. The multi-layer fin structure of the utility model is distributed in a stepped manner, and flow guides are arranged around, which can not only reinforce the fin design structure, but also ensure the heat dissipation effect by playing a role of wind field flow guiding, and the stepped structure not only makes the cylinder head body structure compact, but also is more lightweight compared with traditional fins; the stepped fin and the double-sided flow guide are designed in cooperation to realize airflow dynamic optimization.

[0018] 2. The cylinder head body is also provided with multiple reinforcing ribs, which are connected by the compact structure in the cavity to make the overall structure of the cylinder head more stable, and also reduce the vibration caused by the movement of the valve train. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic view of the embodiment of the air-cooled motorcycle engine cylinder head of the utility model;

[0020] Figure 2 It is a schematic view of one side of the weight reduction groove of the embodiment of the air-cooled motorcycle engine cylinder head of the utility model;

[0021] Figure 3 It is a top view of Figure 1 ;

[0022] Figure 4 It is an A-A sectional view of Figure 3 ; DETAILED DESCRIPTION

[0023] The embodiment will be further described in detail as follows:

[0024] The reference signs in the drawings of the specification include: cylinder head body 1, chain cavity 2, camshaft support 3, cylinder head cover surface 4, multi-layer fin structure 5, windward side 6, leeward side 7, flow guide 8, shaft hole 9, intake and exhaust passage 10, weight reduction groove 11, transverse reinforcing rib 12, longitudinal reinforcing rib 13, vertical reinforcing rib 14.

[0025] Embodiment 1

[0026] As shown in Figures 1-4 , an air-cooled motorcycle engine cylinder head comprises a cylinder head body 1, a chain cavity 2, two camshaft supports 3, a cylinder head cover surface 4 and a multi-layer fin structure 5, the two camshaft supports 3 are located at the top of the cylinder head body 1, the cylinder head cover surface 4 surrounds the top of the cylinder head body 1, the multi-layer fin structure 5 is in a stepped structure, and the multi-layer fin structure 5 is connected with flow guides 8 on the windward side 6 and the leeward side 7 of the cylinder head body 1.

[0027] The flow guides 8 are inclinedly arranged outward. The inclined flow guides 8 can actively “press” the airflow into the fin gap, avoiding the airflow from deviating from the heat dissipation area due to inertia or external interference (such as vehicle body turbulence).

[0028] The multi-layered fin structure 5 is a stepped structure with the top larger than the bottom, that is, the fins are shorter from top to bottom, and the end portions are inwardly retracted. The upper part of the multi-layered fin structure 5 is closer to the high-temperature area of the engine combustion chamber, and the heat dissipation demand is higher. The top of the multi-layered fin structure 5 is larger, and the heat can be dissipated faster.

[0029] The multi-layered fin structure 5 is distributed on the left and right sides of the cylinder head body 1 and extends to the windward side 6 and the leeward side 7 of the cylinder head body 1, respectively.

[0030] The chain cavity 2 is located on the left side of the cylinder head body 1, and the slope of the multi-layered fin structure 5 on the left side is smaller than that on the right side.

[0031] Two weight-reducing grooves 11 are arranged below the shaft hole 9 of the cylinder head body 1 and close to the intake and exhaust passages 10, and the weight-reducing grooves 11 are located on one side of the chain cavity 2.

[0032] The two camshaft supports 3 are located on the top of the cylinder head body 1, and a transverse reinforcing rib 12 is arranged between the two camshaft supports 3.

[0033] The camshaft support 3 is connected to the cylinder head cover 4 through a longitudinal reinforcing rib 13.

[0034] A vertical reinforcing rib 14 is arranged on the longitudinal reinforcing rib 13, and the vertical reinforcing rib 14 is attached to the camshaft support 3.

[0035] The above is only an embodiment of the present application, and the specific structure and characteristics of the scheme are not described in detail. The ordinary technical personnel in the art knows all the ordinary technical knowledge in the technical field of the present application before the application date or the priority date, can know all the prior art in the field, and has the ability to apply conventional experimental means before that date. The ordinary technical personnel in the art can improve and implement the present scheme based on their own ability under the guidance of the present application. Some typical known structures or known methods should not be an obstacle for the ordinary technical personnel in the art to implement the present application. It should be noted that for the technical personnel in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be considered as the protection scope of the present application. These do not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode in the specification can be used to explain the content of the claims.

Claims

1. An air-cooled motorcycle engine cylinder head comprising a cylinder head body, a chain cavity, a camshaft support and a multi-layered fin structure, characterized in that, The multilayer fin structure is in a stepped structure, and a flow guide plate is arranged on the multilayer fin structure.

2. The air-cooled motorcycle engine cylinder head according to claim 1, characterized in that: The multilayer fin structure close to the leeward side of the cylinder head body is also connected with a flow guide plate.

3. The air-cooled motorcycle engine cylinder head of claim 2, wherein: The flow guide plate is arranged obliquely outward.

4. The air-cooled motorcycle engine cylinder head according to claim 3, characterized in that: The multilayer fin structure is in a stepped structure with the upper part being larger and the lower part being smaller.

5. The air-cooled motorcycle engine cylinder head of claim 4, wherein: The multilayer fin structure is distributed on the left and right sides of the cylinder head body and extends to the windward side and the leeward side of the cylinder head body respectively.

6. The air-cooled motorcycle engine cylinder head of claim 5, characterized in that: The chain cavity is located on the left side of the cylinder head body, and the slope of the multilayer fin structure on the left side is smaller than that on the right side.

7. The air-cooled motorcycle engine cylinder head of claim 6, characterized in that: A weight-reducing groove is arranged below the shaft hole of the cylinder head body.

8. The air-cooled motorcycle engine cylinder head according to any of claims 1-7, characterized in that: Two camshaft supports are arranged on the top of the cylinder head body, and a transverse reinforcing rib is arranged between the two camshaft supports.

9. The air-cooled motorcycle engine cylinder head of claim 8, characterized in that: The camshaft supports are connected with the cylinder head cover through longitudinal reinforcing ribs.

10. The air-cooled motorcycle engine cylinder head of claim 9, characterized in that: Vertical reinforcing ribs are arranged on the longitudinal reinforcing ribs, and the vertical reinforcing ribs are attached to the camshaft supports.

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