Engine cooling air duct structure

Abstract

The utility model belongs to the technical field of engine heat dissipation, and particularly relates to an engine cooling air duct structure which comprises a cylinder head, an air guide cover and a cylinder head shell, the air guide cover is installed on one side of the cylinder head, the cylinder head shell is installed on the cylinder head, and the side, away from a combustion chamber, of the cylinder head and the cylinder head shell form a first air duct. A barrier plate is arranged between the cylinder head and the wind scooper, one end of the barrier plate is located above the combustion chamber, and the other end of the barrier plate penetrates through the first air duct; the barrier plate is arranged above the combustion chamber, so that airflow is not easy to flow to the upper end of the cylinder head, the air circulation amount near the combustion chamber is increased, the circulation amount distribution of all positions of the engine is more reasonable, and the heat dissipation effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of engine heat dissipation, in particular to an engine cooling air duct structure. Background Art

[0002] The cylinder cooling of the engine is generally water-cooled or air-cooled. Among them, the air-cooled engine includes an air shroud and a fan, which are arranged on one side of the engine, and the air is sucked between the air shroud and the engine, passes through the cylinder, and then discharged through the other side of the engine. An air guide channel is arranged between the air shroud shell and the engine, so that the air flows to the cylinder head, the combustion chamber and the outside of the crankcase respectively; and the main heat generated by the engine comes from the combustion in the combustion chamber. The heat generated by the rocker arm movement in the cylinder head is less than the heat generated by the combustion chamber. When the total air flow rate remains unchanged, part of the air flows to the upper end of the cylinder head, which will reduce the flow rate near the combustion chamber and reduce the heat dissipation effect near the combustion chamber. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide an engine cooling air duct structure, which solves the technical problem that part of the air flows to the upper end of the cylinder head, which reduces the flow rate near the combustion chamber and reduces the heat dissipation effect near the combustion chamber.

[0004] The technical solution adopted by the utility model is as follows:

[0005] An engine cooling air duct structure includes a cylinder head, an air guide cover and a cylinder head shell. The side of the cylinder head away from the combustion chamber forms a first air duct with the cylinder head shell. A blocking plate is arranged between the cylinder head and the air guide cover. One end of the blocking plate is located above the combustion chamber, and the other end of the blocking plate passes through the first air duct.

[0006] Working principle: air enters between the air shroud and the engine through the fan, and flows from bottom to top through the outside of the crankcase to the outside of the cylinder head. By setting a baffle above the combustion chamber, the air flowing to the upper end of the cylinder head is reduced. The baffle, the cylinder head shell and the inner wall of the air shroud block the airflow, reducing the opening of the first air duct, so that less air flows into the first air duct, thereby increasing the air flowing to the combustion chamber.

[0007] Compared with the prior art, the beneficial effects of the present invention are:

[0008] By arranging a baffle plate above the combustion chamber, the airflow is not easily flowed to the upper end of the cylinder head, so that the air flow near the combustion chamber is increased, the flow distribution at various positions of the engine is more reasonable, and the heat dissipation effect is better.

[0009] As a preferred embodiment of the utility model, a second air duct and a third air duct are further provided on the cylinder head, and the second air duct and the third air duct are respectively located on both sides of the intake pipe of the combustion chamber.

[0010] Beneficial effect: By setting the first air duct, the second air duct and the third air duct, the air flow direction and circulation volume are reasonably distributed, and the upper part of the first air duct is blocked by the first blocking plate, the air inlet of the first air duct is reduced, thereby reducing the air circulation volume near the rocker arm, so that most of the air passes near the combustion chamber, thereby improving the heat dissipation effect.

[0011] As a preferred embodiment of the utility model, the blocking plate includes a first side plate and a second side plate, the first side plate is fixedly connected in the first air duct of the cylinder head and rests on the cylinder head outer shell, the second side plate is fixedly connected to the side of the cylinder head close to the intake pipe of the combustion chamber, one end of the second side plate is fixedly connected to the first side plate, the other end of the second side plate is fixedly connected to the upper end of the intake pipe of the combustion chamber, the second side plate rests on the air guide cover, the inner wall of the air guide cover is provided with a third side plate, the third side plate rests on the second side plate, the air guide cover is provided with an arc-shaped opening, and the arc-shaped opening is engaged with the intake pipe of the combustion chamber.

[0012] Beneficial effect: the first air duct is blocked by the first side panel, and by setting the third side panel and the arc-shaped opening, it can be directly installed with the intake pipe of the combustion chamber. The side wall of the intake pipe of the combustion chamber, the second side panel and the third side panel are used to block the gap between the air guide cover and the cylinder head, so that air cannot enter the upper end of the cylinder head, thereby ensuring the heat dissipation effect near the combustion chamber.

[0013] As a preferred embodiment of the present invention, the second side plate is tilted, and the end of the second side plate connected to the first side plate is lower than the end of the second side plate connected to the air inlet.

[0014] Beneficial effect: By means of the inclined second side plate, air can flow through the side of the combustion chamber intake pipe while the blocking range of the first air duct is increased as much as possible.

[0015] As a preferred embodiment of the present invention, mounting holes are provided in the middle of the second side plate and the third side plate.

[0016] Beneficial effect: Since the second side panel is generally made of aluminum, and the third side panel is generally made of plastic, which has a certain elasticity, by setting a mounting hole in the middle and tightening the screws, the plastic and aluminum parts are made closer, ensuring the sealing effect.

[0017] As a preferred embodiment of the present utility model, the cylinder head, the first side plate and the second side plate are integrally formed, and the third side plate and the air guide cover are integrally formed.

[0018] Beneficial effects: The one-piece molding process improves the structural strength and sealing of components and ensures the barrier effect.

[0019] As a preferred embodiment of the present utility model, the cylinder head is provided with multiple layers of heat sinks in the first air duct, the second air duct and the third air duct.

[0020] Beneficial effect: By providing the heat sink, the contact area between the air and the cylinder head in each air duct is increased, thereby improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the engine cooling air duct structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the internal structure of an embodiment of the engine cooling air duct structure of the utility model;

[0023] Figure 3 It is a structural schematic diagram of a cylinder head and a cylinder head housing in an embodiment of the engine cooling air duct structure of the utility model;

[0024] Figure 4 It is a structural schematic diagram of a cylinder head in an embodiment of the engine cooling air duct structure of the utility model;

[0025] Figure 5 It is a structural schematic diagram of an air guide cover in an embodiment of the engine cooling air duct structure of the utility model.

[0026] The reference numerals include: cylinder head 1, sealing cavity 11, first air duct 12, second air duct 13, third air duct 14, air guide cover 2, third side plate 21, arc-shaped opening 22, cylinder head housing 3, blocking plate 4, first side plate 41, second side plate 42, combustion chamber intake pipe 5, and mounting hole 6. DETAILED DESCRIPTION

[0027] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.

[0028] In the description of the present application, the terms "first", "second", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] See also Figure 1 , Figure 2As shown, this embodiment discloses an engine cooling air duct structure, including a cylinder head 1, an air guide cover 2 and a cylinder head shell 3, wherein the air guide cover 2 is installed on one side of the cylinder head 1, and the cylinder head shell 3 is installed on the cylinder head 1. A blocking plate 4 is provided on the side of the cylinder head 1 close to the air guide cover 2, and the blocking plate 4 is located above the combustion chamber. The cylinder head shell 3, the cylinder head 1, the blocking plate 4 and the air guide cover 2 form a sealed cavity 11 (the upper end of the cylinder head 1), and the blocking plate 4 prevents the air flow from flowing to the upper end of the cylinder head 1, thereby increasing the flow volume near the combustion chamber, making the flow volume distribution at various positions of the engine more reasonable, and achieving a better heat dissipation effect.

[0030] Among them, see Figure 3 As shown, the cylinder head 1 is provided with a first air duct 12, a second air duct 13 and a third air duct 14, the first air duct 12 is located on the side of the cylinder head 1 away from the combustion chamber, the second air duct 13 is respectively located on both sides of the combustion chamber intake pipe 5, and the baffle plate 4 is located in the middle of the first air duct 12; by arranging the first air duct 12, the second air duct 13 and the third air duct 14, the air flow direction and circulation amount are reasonably distributed, and the upper half of the first air duct 12 is blocked by the first baffle plate 4, so that the air inlet of the first air duct 12 is reduced, thereby reducing the air circulation amount near the rocker arm, so that most of the air passes near the combustion chamber, thereby improving the heat dissipation effect.

[0031] Among them, see Figure 4 and Figure 5 As shown, the blocking plate 4 includes a first side plate 41 and a second side plate 42, the first side plate 41 is fixedly connected to the first air duct 12 of the cylinder head 1 and abuts against the cylinder head housing 3, the second side plate 42 is fixedly connected to the side of the cylinder head 1 close to the combustion chamber intake pipe 5, one end of the second side plate 42 is fixedly connected to the first side plate 41, the other end of the second side plate 42 is fixedly connected to the upper end of the combustion chamber intake pipe 5, the second side plate 42 abuts against the air guide cover 2, and the inner wall of the air guide cover 2 is provided with a third side plate 2 1, the third side plate 21 is pressed against the second side plate 42, the air guide cover 2 is provided with an arc-shaped opening 22, and the arc-shaped opening 22 is engaged with the combustion chamber intake pipe 5: the first air duct 12 is blocked by the first side plate 41, and the third side plate 21 and the arc-shaped opening 22 can be directly installed with the combustion chamber intake pipe 5, and the side wall of the combustion chamber intake pipe 5, the second side plate 42 and the third side plate 21 are used to block the gap between the air guide cover 2 and the cylinder head 1, so that air cannot enter the upper end of the cylinder head 1, thereby ensuring the heat dissipation effect near the combustion chamber.

[0032] Among them, the second side panel 42 is inclined, and the end of the second side panel 42 connected to the first side panel 41 is lower than the end of the second side panel 42 connected to the air inlet; through the inclined second side panel 42, air can flow through the side of the combustion chamber intake pipe 5 while increasing the blocking range of the first air duct 12 as much as possible.

[0033] Wherein, the middle parts of the second side plate 42 and the third side plate 21 are both provided with mounting holes 6 .

[0034] In this embodiment, the cylinder head 1, the first side panel 41 and the second side panel 42 are integrally formed and are made of aluminum parts, and the third side panel 21 and the air guide cover 2 are integrally formed and are made of plastic parts; the integral molding process improves the sealing of the structural strength of the components and ensures the barrier effect, and after being tightened by screws, the plastic parts and the aluminum parts are made tighter, ensuring the sealing effect.

[0035] In other embodiments, the first side plate 41 and the second side plate 42 may be welded to the cylinder head 1 .

[0036] The cylinder head 1 is provided with multiple layers of heat sinks in the first air duct 12 , the second air duct 13 and the third air duct 14 . The heat sinks are provided to increase the contact area between the air and the cylinder head 1 in each air duct, thereby improving the heat dissipation effect.

[0037] The working principle of this embodiment is as follows:

[0038] The fan of the engine draws outside air into the inner side of the air guide cover 2, flows to the cylinder head 1, and flows to the first air duct 12, the second air duct 13, and the third air duct 14 respectively. Since the first side plate 41 is provided to partially block the first air duct 12, the air circulation amount entering the first air duct 21 is reduced. The second side plate 42 and the third side plate 21 block the upper end portion between the cylinder head 1 and the air guide cover 2, thereby increasing the air circulation amount entering the second air duct 13 and the third air duct 14.

[0039] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An engine cooling air duct structure, comprising a cylinder head, an air guide cover and a cylinder head shell, wherein the air guide cover is mounted on one side of the cylinder head, and the cylinder head shell is mounted on the cylinder head, characterized in that: A side of the cylinder head away from the combustion chamber forms a first air duct with the cylinder head shell, a blocking plate is arranged between the cylinder head and the air guide cover, one end of the blocking plate is located above the combustion chamber, and the other end of the blocking plate passes through the first air duct.

2. The engine cooling air duct structure according to claim 1, characterized in that: The cylinder head is also provided with a second air duct and a third air duct, and the second air duct and the third air duct are respectively located on both sides of the combustion chamber intake pipe.

3. The engine cooling air duct structure according to claim 2, characterized in that: The blocking plate includes a first side plate and a second side plate, the first side plate is fixedly connected in the first air duct of the cylinder head and rests on the cylinder head shell, the second side plate is fixedly connected to a side of the cylinder head close to the combustion chamber intake pipe, one end of the second side plate is fixedly connected to the first side plate, the other end of the second side plate is fixedly connected to the upper end of the combustion chamber intake pipe, the second side plate rests on the air guide cover, the inner wall of the air guide cover is provided with a third side plate, the third side plate rests on the second side plate, the air guide cover is provided with an arc-shaped opening, and the arc-shaped opening is engaged with the combustion chamber intake pipe.

4. The engine cooling air duct structure according to claim 3, characterized in that: The second side plate is arranged obliquely, and an end of the second side plate connected to the first side plate is lower than an end of the second side plate connected to the air inlet.

5. The engine cooling air duct structure according to claim 3, characterized in that: The middle parts of the second side plate and the third side plate are both provided with mounting holes.

6. The engine cooling air duct structure according to claim 3, characterized in that: The cylinder head, the first side plate and the second side plate are integrally formed, and the third side plate and the air guide cover are integrally formed.

7. The engine cooling air duct structure according to claim 2, characterized in that: The cylinder head is provided with multiple layers of heat sinks in the first air duct, the second air duct and the third air duct.

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