A type of air-cooled engine cylinder head

Abstract

This utility model relates to the field of engine cooling technology, specifically proposing an air-cooled engine cylinder head, including a base, a combustion chamber, spark plug holes, a sensor hole, and heat sink fins. The combustion chamber is embedded in the base and is inclined, with its opening end contacting the base to form a mating surface. The combustion chamber includes a first frustum chamber and a second frustum chamber that expand outward from the inside of the base and are connected in sequence. The conical surface of the second frustum chamber has a greater inclination angle than that of the first frustum chamber. The sensor hole is located on the side of the base, and the spark plug holes are symmetrically arranged about the sensor holes. The spark plug holes penetrate the base from the end away from the mating surface and connect to the combustion chamber. The spark plug holes are inclined, and the centers of the two spark plug holes intersect. This utility model optimizes the air-fuel mixture flow through the inclined bathtub-shaped combustion chamber, making engine ignition easier. Furthermore, the inverted cone shape at the lower end of the combustion chamber facilitates rapid outward flame propagation, improving engine performance.

Description

Technical Field

[0001] This utility model belongs to the field of engine cooling technology, and specifically relates to an air-cooled engine cylinder head. Background Technology

[0002] Traditional air-cooled cylinder head fins have a uniform thickness and spacing, resulting in low heat dissipation and making them prone to problems such as cylinder head deformation and spark plug carbon buildup. Most existing engine cylinder heads have a single spark plug ignition design, which has weak ignition capability and lacks redundancy. In addition, traditional cylinder heads do not have a design for installing temperature sensors, and the combustion chamber is mostly spherical, which is not conducive to the use of engines that require enhanced performance. Utility Model Content

[0003] To address the existing technical problems, this utility model proposes an air-cooled engine cylinder head. The purpose of this utility model and the solution to its technical problems are achieved by the following technical solutions.

[0004] According to this utility model, an air-cooled engine cylinder head includes a base, a combustion chamber, a spark plug hole, a sensor hole, and a heat sink. The combustion chamber is embedded in the base and is inclined, with the opening end of the combustion chamber contacting the base to form a mating surface. The combustion chamber includes a first frustum chamber and a second frustum chamber that expand outward from the inside of the base and are connected in sequence. The conical surface of the second frustum chamber has a greater inclination angle than that of the first frustum chamber. The sensor hole is located on the side of the base. The spark plug hole is symmetrically arranged with respect to the sensor hole, and the spark plug hole penetrates the base from the end away from the mating surface and connects to the combustion chamber. The spark plug hole is inclined, and the centers of the two spark plug holes intersect.

[0005] Furthermore, the outer surface of the substrate is provided with several heat sinks along the circumference, and the thickness of the heat sinks gradually decreases from the root to the end.

[0006] Furthermore, the heat sink on the substrate is divided into region A and region B with the bottom surface of the combustion chamber as the dividing line, wherein the length of the heat sink in region A is greater than that in region B.

[0007] Furthermore, the heat sinks in region A are more densely distributed than those in region B, and the heat sinks in region A are perforated.

[0008] Furthermore, the included angle between the two spark plug holes is 50°.

[0009] Furthermore, an annular clearance groove is provided circumferentially on the inner wall of the spark plug hole at the end away from the substrate.

[0010] Furthermore, the sensor hole includes an interconnected internal threaded hole and a probe hole, with the probe hole positioned close to the combustion chamber.

[0011] In summary, this utility model has the following advantages: (1) When the piston moves upward, the bathtub-type combustion chamber is more likely to form gas tumble in the upper small area and form a richer mixture at the spark plug ignition position. At the same time, the inclined design optimizes the flow of the mixture and makes it easier for the engine to ignite. Moreover, the inverted cone shape at the lower end of the combustion chamber is conducive to the rapid outward spread of the flame, which improves the engine performance. The combination of the frustum and the trumpet shape of the combustion chamber enhances turbulence and can improve combustion efficiency.

[0012] (2) The dual spark plug design achieves redundant ignition and enhances ignition capability; at the same time, the annular relief groove is set, which not only facilitates spark plug installation and prevents spark plug carbon buildup, but also avoids local high temperature points and reduces thermal stress concentration.

[0013] (3) Setting up sensor mounting holes can monitor the cylinder head temperature gradient in real time. At the same time, the probe hole is deep into the base to ensure that the sensor head is in close contact with the bottom of the hole, ensuring the reliability of heat transfer. The internal threaded hole ensures that the sensor is installed firmly and will not loosen due to vibration.

[0014] (4) The heat sink is partitioned and the length and density of the heat sinks in different areas are different. At the same time, the thickness gradient design increases the heat dissipation area and the heat conduction cross-sectional area, thereby improving the heat dissipation capacity of the cylinder head.

[0015] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, preferred embodiments are given below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an air-cooled engine cylinder head according to the present invention.

[0017] Figure 2 for Figure 1 Front view.

[0018] Figure 3 for Figure 2 A sectional view of CC.

[0019] Figure 4 for Figure 1 Rear view.

[0020] Figure 5 for Figure 4 A sectional view of DD. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and preferred embodiments.

[0022] Please see Figure 1A cylinder head for an air-cooled engine includes a base, a combustion chamber 1, a spark plug hole 4, a sensor hole 3, and a heat sink 2. The combustion chamber 1 is embedded in the base and is inclined. The opening end of the combustion chamber 1 contacts the base to form a mating surface 6. The combustion chamber 1 is circular and bathtub-shaped. Specifically, the combustion chamber 1 includes a first frustum chamber 5 and a second frustum chamber that are interconnected. The first frustum chamber 5 and the second frustum chamber expand outward from the inside of the base, and the inclination angle of the cone surface of the second frustum chamber is greater than the inclination angle of the cone surface of the first frustum chamber 5. (Note: The last sentence appears to be incomplete and possibly refers to a different context.) Figure 1 As shown, the extension length of the second frustum conical surface gradually increases from the top to the bottom. With the help of the aforementioned structure, the combustion chamber 1 can more easily form gas tumble in the small area at the top (i.e., inside the first frustum chamber 5) when the piston moves upward, and form a richer mixture at the spark plug ignition position. At the same time, the inclined design optimizes the flow of the mixture, making it easier for the engine to ignite. Moreover, the trumpet-shaped structure at the bottom of the combustion chamber 1 is conducive to the rapid outward propagation of the flame, improving engine performance. The combination of the frustum and trumpet-shaped structure in the combustion chamber 1 enhances turbulence and can improve combustion efficiency.

[0023] Please see Figures 2-3 Sensor hole 3 is located on the side of the substrate, for reference. Figure 2 As shown, the sensor hole 3 is located on the top of the substrate, and the spark plug hole 4 is symmetrically arranged about the sensor hole 3. The spark plug hole 4 passes through the substrate from the end away from the mating surface and communicates with the combustion chamber 1. The spark plug hole 4 is inclined and the centers of the two spark plug holes 4 intersect, and the included angle between the two spark plug holes 4 is 50°. With the help of the aforementioned structure, redundant ignition is achieved, and the ignition capability is enhanced.

[0024] Please see Figure 1 , Figure 3 The base has several heat sinks 2 arranged circumferentially on its outer surface. The thickness of the heat sinks 2 gradually decreases from the root to the end. In this embodiment, the thickness of the heat sink at the root is 4 mm, and it is reduced to 2.5 mm at the end. At the same time, the axial length of the heat sink is greater than 60 mm. The heat sinks on the base are divided into region A and region B with the bottom surface of the combustion chamber 1 (i.e., the upper end of the frustum structure 5) as the dividing line. The length of the heat sink in region A is greater than that in region B. Specifically, in this embodiment, the length of the heat sink in region A is 15%-30% longer than that in region B. At the same time, the heat sinks in region A are more densely distributed than those in region B, and the heat sinks in region A are hollow. With the help of the aforementioned structure, the heat dissipation area and heat conduction cross-sectional area of ​​the cylinder head are increased, and the heat dissipation capacity of the cylinder head is improved.

[0025] Please see Figure 4An annular relief groove 7 is provided circumferentially on the inner wall of the spark plug hole 4 at the end away from the base. Since the annular relief groove 7 is located inside the spark plug hole 4, that is, the annular relief groove 7 is also inclined, the aforementioned design not only facilitates spark plug installation and prevents spark plug carbon buildup, but also avoids local high temperature points and has the effect of reducing thermal stress concentration.

[0026] Please see Figure 5 The sensor hole 3 includes an internally threaded hole 8 and a probe hole 9 that are interconnected, and the probe hole 9 is located close to the combustion chamber 1. Specifically, in this embodiment, the sensor hole 3 has a hole depth of 10mm, and the internally threaded hole 8 has an M10X1 precision thread structure. With the help of the aforementioned design, the cylinder head temperature gradient can be monitored in real time. At the same time, the probe hole 9 extends deep into the base to ensure that the sensor head and the bottom of the hole are in close contact, ensuring the reliability of heat transfer. The internally threaded hole 8 ensures that the sensor is firmly installed and will not loosen due to vibration.

[0027] The above description is merely a preferred embodiment of this utility model. Any simple modifications, equivalent changes, and alterations made by those skilled in the art to the above embodiments based on the technical essence of this utility model without departing from the scope of the technical solution of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A cylinder head for an air-cooled engine, characterized in that: It includes a substrate, a combustion chamber (1), a spark plug hole (4), a sensor hole (3), and a heat sink (2); The combustion chamber (1) is embedded in the base in the front and is inclined. The opening end of the combustion chamber (1) contacts the base to form a joint surface (6). The combustion chamber (1) includes a first frustum chamber (5) and a second frustum chamber that are arranged to expand outward from the inside of the base and are connected in sequence. The inclination angle of the cone surface of the second frustum chamber is greater than that of the first frustum chamber (5). The sensor hole (3) is located on the side of the substrate. The spark plug hole (4) is symmetrically arranged with respect to the sensor hole (3). The spark plug hole (4) passes through the substrate from the end away from the mating surface and communicates with the combustion chamber (1). The spark plug hole (4) is inclined and the centers of the two spark plug holes (4) intersect.

2. The air-cooled engine cylinder head according to claim 1, characterized in that: The base has several heat sinks (2) arranged circumferentially on its exterior. The thickness of the heat sinks (2) gradually decreases from the root to the end.

3. A cylinder head for an air-cooled engine according to claim 2, characterized in that: The heat sink on the substrate is divided into region A and region B by the bottom surface of the combustion chamber (1), where the length of the heat sink in region A is greater than that in region B.

4. A cylinder head for an air-cooled engine according to claim 3, characterized in that: The heat sinks in area A are more densely distributed than those in area B, and the heat sinks in area A are perforated.

5. A cylinder head for an air-cooled engine according to claim 1, characterized in that: The included angle between the two spark plug holes (4) is 50°.

6. A cylinder head for an air-cooled engine according to claim 1, characterized in that: The spark plug hole (4) has an annular clearance groove (7) on the inner wall of the end away from the substrate.

7. A cylinder head for an air-cooled engine according to claim 1, characterized in that: The sensor hole (3) includes an internally threaded hole (8) and a probe hole (9) that are interconnected, and the probe hole (9) is located close to the combustion chamber (1).

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