Large-displacement engine body

Abstract

A large-displacement engine body is characterized in that a plurality of cylinder holes are distributed on the engine body at intervals, six cylinder cover bolt lugs are arranged on the periphery of each cylinder hole, and a water jacket with the lower portion communicated with the cylinder hole is arranged on the periphery of each cylinder hole. And the upper water jackets on the exhaust sides of the two adjacent cylinder holes are communicated. The machine body is provided with a continuous upper water channel, the cooling effect is good, the size of a cylinder hole can be increased, the displacement is increased, and sand cleaning is convenient.

Description

Technical Field

[0001] The utility model relates to an engine body, in particular to a compact engine body with a water jacket having a flow-guiding structure. Background Art

[0002] The small size and high power of the engine means that the engine power density is high and the maximum explosion pressure in the cylinder is high. In order to ensure the effective sealing of the cylinder, six bolts are usually arranged in each cylinder. Due to the compact structure, the bolts will divide the upper water jacket of the engine body, making the upper layer of the water jacket discontinuous, and the cooling water flow rate is low and uneven, which in turn affects the cooling of the high-heat area of ​​the engine body, which will limit the increase in engine power.

[0003] In order to improve the problem of low and uneven water flow rate in the high-temperature area on the exhaust side of the water jacket, the water jacket of the engine body disclosed in 202021063670.5 "A six-cylinder diesel engine dry body" adopts the form of adding a water passage on the exhaust side, which can play a certain improvement role, but the improvement is not thorough, and it is found that the above-mentioned water passage is relatively closed, which is not convenient for sand cleaning, and it can only be found out whether it is blocked through dissection, resulting in a low engine body yield, and blocked products are not discovered, causing cylinder pulling failures during engine operation. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a large-displacement engine body with a continuous upper water channel, which has a good cooling effect, can increase the cylinder hole size, increase the displacement, and is convenient for sand cleaning.

[0005] In order to achieve the above technical purpose, the technical solution adopted is: a large-displacement engine body, on which a plurality of cylinder holes are arranged at intervals, six cylinder head bolt brackets are arranged around each cylinder hole, and a water jacket connected at the bottom is provided on the periphery of each cylinder hole, characterized in that: the cylinder head bolt bracket located on the exhaust side is separated from the outer walls of the two adjacent cylinder holes, so that the upper water jackets on the exhaust sides of the two adjacent cylinder holes are connected.

[0006] Preferably, the cylinder head bolt boss located on the exhaust side is separated from the outer walls of two adjacent cylinder holes by eccentric arc thinning to form a smooth outer wall surface.

[0007] Preferably, a bowl plug hole connected to the water jacket is provided below the cylinder head bolt bracket on the exhaust side between two adjacent cylinder holes.

[0008] Preferably, the diameter of the bowl plug hole is 26 mm to 30 mm, and its height to the top surface of the body is 76 mm to 80 mm.

[0009] Preferably, the local minimum thickness of the water jacket cavity between the cylinder head bolt boss on the exhaust side and the adjacent cylinder bore wall is 4 mm to 6 mm.

[0010] Preferably, when the distance between the two cylinders is 127 mm, the cylinder bore diameter is increased to 108 mm to 110 mm.

[0011] The beneficial effects of the utility model are:

[0012] 1. The engine body of the present invention is connected to the water jacket cavity of each cylinder through the main water pipe. Water flows through the main water pipe and enters the water jacket on the intake side of each cylinder. Under the guidance of the water flow channel formed by the bolt bracket on the exhaust side of each cylinder and the wall surface of the two adjacent cylinder bores, water flows through the water jacket cavity between the two cylinders from the intake side to the exhaust side, and flows from the water hole on the exhaust side water jacket to the cylinder head water jacket. A water flow channel is formed between the bolt bracket on the exhaust side and the wall surface of the two adjacent cylinders, so that the water jacket of each cylinder is unobstructed, improving the cooling of the high-heat area of ​​the cylinder jacket of the engine body. In addition, the bolt bracket is separated from the cylinder bore walls on both sides, and sand can be cleaned between the cylinder bore and the bolt bracket. At the same time, because the cylinder bore diameter can be increased by this structure, the displacement is increased compared with the existing engine power.

[0013] 2. By eccentrically thinning the bolt bracket and partially thinning the outer wall of the cylinder liner, the wall structure of the newly formed bolt bracket can be made smoother and more fluent, preventing interference between water flows and improving the inter-cylinder cooling effect.

[0014] 3. In addition, a sand cleaning hole is set at the lower part of the bolt bracket on the exhaust side of the engine body. The foundry manufacturer can use this hole to clean the sand and inspect the relatively closed area between the two cylinders, which greatly improves the casting yield of the engine body.

[0015] 4. Reasonable setting of the size and height of the bowl plug hole can achieve the optimal sand cleaning position, and the plug can play a supporting role when the sand is not cleaned, reducing the impact on the engine body strength and the downward force transmitted by the cylinder head screw.

[0016] 5. Through the innovative design of the water jacket structure, the problem of low cooling water flow rate caused by the water jacket cavity in the high-temperature area of ​​the engine body being divided by bolts due to the compression of the engine body cylinder center distance is solved, making the engine structure more compact. In addition, the product casting yield rate is improved, meeting the use requirements under high power density, and improving product reliability and competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the planar structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the machine body;

[0019] Figure 3 for Figure 2 AA section view;

[0020] In the figure: 1. Engine body, 2. Cylinder hole, 3. Cylinder head bolt bracket, 4. Bowl plug hole, 5. Water jacket, 6. Main water pipe, 3.1. Exhaust side bolt bracket, 3.2. Intake side bolt bracket. DETAILED DESCRIPTION

[0021] The preferred embodiments of the utility model are given below in conjunction with the accompanying drawings to explain the technical solution of the utility model in detail. Here, the corresponding drawings will be given to explain the utility model in detail. It should be particularly noted that the preferred embodiments described here are only used to illustrate and explain the utility model, and are not used to limit or restrict the utility model.

[0022] like Figure 1 , Figure 2 As shown, a large displacement engine body, a plurality of cylinder holes 2 are arranged on the body 1 at a certain cylinder center distance interval, six cylinder head bolts 3 are arranged around each cylinder hole 2, a water jacket 5 is arranged on the periphery of each cylinder hole 2 and is connected at the bottom, a water jacket cavity is formed between the cylinder hole 2 and the adjacent cylinder holes 2 and the surrounding partitions, and a main water pipe 6 is arranged on the outside of the intake side partition of the body, and the main water pipe 6 is connected to the water jacket cavity, as shown in FIG. Figure 3 As shown, a slope is arranged on the top surface of the water jacket cavity between the two cylinders, gradually rising from the bolt bracket 3.2 on the intake side to the bolt bracket 3.1 on the exhaust side, and connected to the top surface water cavity.

[0023] A cylinder bore diameter larger than the conventional design will cause the cylinder bore 2 to be connected to the cylinder head bolt 3, which will lead to poor and uneven water flow in the upper layer of the engine body water jacket, affecting the cooling of the high heat load area in the upper layer of the engine body, limiting the engine power increase. In addition, since the water jacket core is divided between the two cylinders by the bolt jack, an independent tall and thin sand core is formed between the two cylinders, which is easy to break during casting. In order to prevent the core from breaking, the height of the water jacket needs to be lowered, which will cause a lack of water flow cooling at the high position with high heat load between the two cylinders of the engine body, which will also limit the upper limit of engine power. For example: when the distance between the two cylinders is 127mm, the diameter of the cylinder bore 2 is increased to 108mm~110mm.

[0024] like Figure 1 As shown, the cylinder head bolt bracket 3 on the exhaust side is separated from the outer wall of the two adjacent cylinder holes 2, so that the upper water jackets 5 on the exhaust side of the two adjacent cylinder holes 2 are connected. Through the above structure, the water flow is guided from the intake side main water pipe to each cylinder, flows around the cylinder sleeve to the exhaust side at the same time, and flows from the water hole on the exhaust side water jacket to the cylinder head water jacket. With this improved structure, a cylinder bore diameter larger than the conventional design can be arranged under a limited cylinder center distance, which can increase the engine displacement, thereby increasing the upper limit of the engine output power and improving product competitiveness.

[0025] The present invention patent makes innovative design of the structure through the following implementation methods, refer to the attached Figure 2 and 3As shown, the water jacket 5 between the two cylinder holes is divided by the exhaust side bolt bracket 3.1 and the intake side bolt bracket 3.2. By designing two eccentric arcs on the exhaust side bolt bracket 3.1, an arc radius C is set corresponding to the front cylinder sleeve, and the arc center is offset by d from the center of the exhaust side bolt bracket. Another arc radius E is set corresponding to the rear cylinder sleeve, and the arc center is offset by F from the center of the exhaust side bolt bracket. A water cavity is formed between the exhaust side bolt bracket 3.1 and the outer wall of the two adjacent cylinder holes, guiding the water flow between the two cylinders to flow from the intake side to the exhaust side, and flowing to the cylinder head water jacket through the water hole on the exhaust side of the water jacket. Based on the above structure, the water jacket core between the two cylinders of the engine body is connected to the exhaust side water jacket core, which improves the strength of the water jacket core between the two cylinders, and can increase the height of the water jacket core here, so that the water flow of each cylinder can flow around the cylinder sleeve smoothly, meeting the cooling demand of the high heat load area of ​​the water jacket between the two cylinders of the engine body. For example, the cylinder head bolt bracket 3 (exhaust side bolt bracket 3.1) located on the exhaust side is thinned by an eccentric 7mm~9mm arc to form a smooth outer wall surface separated from the outer walls of the two adjacent cylinder holes 2, and the arc radius is 15mm~25mm.

[0026] A bowl plug hole 4 connected to the water jacket 5 is provided below the cylinder head bolt bracket 3 on the exhaust side between two adjacent cylinder holes 2. The bowl plug hole has a diameter B and a distance H from the top surface of the engine body. By reasonably setting its diameter and position, it can meet the sand cleaning requirements of the closed area between the two cylinders while avoiding affecting the engine body strength and the downward force transmission of the cylinder head screw. For example: the diameter of the bowl plug hole 4 is 26mm~30mm, and its height to the top surface of the engine body is 76mm~80mm. The bowl plug hole 4 is blocked when sand is not cleaned.

[0027] The local minimum thickness of the water jacket cavity between the cylinder head bolt bracket 3 on the exhaust side and the adjacent cylinder bore 2 wall is 4mm~6mm, which ensures smooth water flow and meets cooling requirements, while increasing the cylinder bore diameter as much as possible to improve displacement.

[0028] The above are only preferred examples of the present invention and are not intended to limit or restrict the present invention. For researchers or technicians in this field, the present invention may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection declared by the present invention.

Claims

1. A large-displacement engine body, wherein a plurality of cylinder holes (2) are arranged at intervals on the body, six cylinder head bolt brackets (3) are arranged around each cylinder hole (2), and a water jacket (5) is provided on the periphery of each cylinder hole (2) and is connected to the bottom. Features: The cylinder head bolt bracket (3) located on the exhaust side is separated from the outer walls of two adjacent cylinder holes (2), so that the upper water jackets (5) on the exhaust sides of the two adjacent cylinder holes (2) are connected.

2. A large displacement engine body as claimed in claim 1, Features: The cylinder head bolt bracket (3) located on the exhaust side is thinned by an eccentric arc to form a smooth outer wall surface and is separated from the outer walls of two adjacent cylinder holes (2).

3. A large displacement engine body as claimed in claim 1, Features: A bowl plug hole (4) connected to the water jacket (5) is provided below the cylinder head bolt bracket (3) located on the exhaust side between two adjacent cylinder holes (2).

4. A large displacement engine body as claimed in claim 3, Features: The bowl plug hole (4) has a diameter of 26 mm to 30 mm, and a height from the bowl plug hole (4) to the top surface of the machine body of 76 mm to 80 mm.

5. A large displacement engine body as claimed in claim 1, Features: The local minimum thickness of the water jacket cavity between the cylinder head bolt bracket (3) on the exhaust side and the wall of the adjacent cylinder hole (2) is 4 mm to 6 mm.

6. A large displacement engine body as claimed in claim 1, Features: When the distance between the two cylinders is 127 mm, the diameter of the cylinder bore (2) is increased to 108 mm to 110 mm.

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