Water jacket sand core structure of engine cylinder cover

Abstract

The utility model discloses an engine cylinder cover water jacket sand core structure, and relates to the technical field of engine cylinder cover water jacket casting, the engine cylinder cover water jacket sand core structure comprises a middle sand core, the upper surface of the middle sand core is fixedly connected with a cavity core, a plurality of first column cores are uniformly arranged on the rear side in the cavity core, and a shaping groove is formed in the middle of the upper surface of the cavity core; and a thickness casting cavity is formed between the inner wall of the middle sand core and the outer surface of the cavity core. According to the utility model, through the arranged cavity core, when the front side sand core is butted and clamped on the middle sand core, the second column core, the third column core and the fourth column core are clamped on the outer surface of the front side of the cavity core, and when the column cores generate extrusion force on the cavity core, the received pressure is dispersed by the arched radian of the outer surface of the cavity core; and the contact surface of the cavity core is prevented from being damaged by concentrated pressure, the compression resistance of the sand core is improved, and the sand core is prevented from being damaged in the splicing process.

Description

Technical Field

[0001] The utility model relates to the field of engine cylinder head water jacket casting, in particular to an engine cylinder head water jacket sand core structure. Background Art

[0002] A large amount of hot air will be generated during the operation of the engine cylinder. In order to dissipate the heat, a water jacket will be installed on the outside of the cylinder head. The water flow stored in the water jacket will dissipate the heat of the cylinder. The engine cylinder head water jacket usually needs to be cast with a sand core.

[0003] The outer surface of the sand core inside the traditional engine cylinder head water jacket is mostly a smooth surface with right angles. When the sand cores are assembled, the smooth sand cores with right angles are easily damaged by the push of external pressure. In addition, the inner wall of the water jacket cast by the sand core of the traditional engine cylinder head water jacket is mostly relatively smooth, which cannot drain the cooling water flow for heat dissipation, making the cooling liquid circulate slowly, thereby reducing the heat dissipation efficiency. Utility Model Content

[0004] The utility model aims to solve the problems that the outer surface of the sand core inside the water jacket of a conventional engine cylinder head water jacket is mostly in the shape of a smooth surface with a right angle, and the sand core with a smooth surface with a right angle is easily damaged under the pushing of external pressure when the sand core is assembled, and the inner wall of the water jacket cast by the sand core of the conventional engine cylinder head water jacket is mostly relatively smooth, and the cooling water flow for heat dissipation cannot be drained, so that the circulation speed of the cooling liquid is relatively slow, thereby making the heat dissipation efficiency low. A water jacket sand core structure of an engine cylinder head is provided.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sand core structure of an engine cylinder head water jacket, comprising a middle sand core, the upper surface of the middle sand core is fixedly connected to a cavity core, a plurality of first column cores are evenly arranged on the rear side of the cavity core, a molding groove is opened in the middle of the upper surface of the cavity core, and a thickness casting cavity is formed between the inner wall of the middle sand core and the outer surface of the cavity core.

[0006] As a further solution of the utility model: a rear side sand core is provided at the rear side of the middle sand core, and a plurality of tongues and grooves are opened in the middle of the front surface of the rear side sand core.

[0007] As a further solution of the utility model: a groove is provided at both left and right ends of the front surface of the rear sand core.

[0008] As a further solution of the utility model: a front sand core is provided on the front side of the middle sand core, and an annular column cavity is opened below one end of the rear surface of the front sand core.

[0009] As a further solution of the utility model: a second column core is fixedly connected to the middle of an inner side of the annular column cavity, and an arc-shaped groove is provided at both upper and lower ends of the middle of the rear surface of the front sand core.

[0010] As a further solution of the utility model: an annular column cavity three is opened above the other end of the rear surface of the front sand core, and a fourth column core is fixedly connected to the middle of the inner side of the annular column cavity three.

[0011] As a further solution of the utility model: an annular column cavity 2 is provided obliquely below the annular column cavity 3, and a third column core is fixedly connected to the middle of the inner side of the annular column cavity 2.

[0012] Compared with the prior art, the utility model has the beneficial effects of: being conducive to improving the pressure resistance of the sand core, preventing the sand core from being damaged during the splicing process, and facilitating improving the effect of water circulation and drainage inside the water jacket formed by sand core casting.

[0013] 1. Through the cavity core, when the front sand core is docked and stuck to the middle sand core, the second column core, the third column core and the fourth column core will be stuck to the outer surface of the front side of the cavity core. When the column core produces extrusion force on the cavity core, the arched curvature of the outer surface of the cavity core disperses the pressure to prevent the pressure concentration from damaging the contact surface of the cavity core, which is beneficial to improve the pressure resistance of the sand core and prevent the sand core from being damaged during the splicing process.

[0014] 2. By setting the shaping groove and the cavity core, the shape of the inner wall of the water jacket formed by casting is the shape of the outer surface of the cavity core. When water flows into the water jacket through the water injection pipe, the water flows along the arc with the same curvature as the inner wall and the outer surface of the cavity core and enters the circulating liquid inlet opened between the liquid drainage arc plates cast by the shaping groove, and flows to the outside of the cylinder head shell formed by the first column core under the guidance of the liquid drainage arc plate, so as to dissipate the heat emitted by the cylinder head provided inside the cylinder head shell, thereby improving the effect of water circulation drainage inside the water jacket formed by sand core casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional structural schematic diagram of a top view of the utility model;

[0016] Figure 2 It is a structural schematic diagram of a three-dimensional view of the front sand core of the utility model;

[0017] Figure 3 It is a structural schematic diagram of a three-dimensional view of the rear sand core of the utility model.

[0018] In the figure: 1. middle sand core; 2. first column core; 3. cavity core; 4. rear sand core; 5. tenon; 6. groove; 7. front sand core; 8. second column core; 9. arc-shaped groove; 10. third column core; 11. fourth column core; 12. annular column cavity one; 13. annular column cavity two; 14. annular column cavity three; 15. shaping groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1 to Figure 3 In the embodiment of the utility model, a sand core structure of a water jacket of an engine cylinder head includes a middle sand core 1, a cavity core 3 is fixedly connected to the upper surface of the middle sand core 1, a plurality of first column cores 2 are evenly arranged on the rear side of the cavity core 3, a shaping groove 15 is opened in the middle of the upper surface of the cavity core 3, a thickness casting cavity is formed between the inner wall of the middle sand core 1 and the outer surface of the cavity core 3, a rear side sand core 4 is arranged on the rear side of the middle sand core 1, a plurality of tenons 5 are opened in the middle of the front surface of the rear side sand core 4, a groove 6 is opened at both ends of the front surface of the rear side sand core 4, and the middle sand core 1 is provided with a plurality of tenons 5. A front sand core 7 is provided on the front side of the core 1, an annular column cavity 12 is provided below one end of the rear surface of the front sand core 7, a second column core 8 is fixedly connected to the middle of the inner side of the annular column cavity 12, an arc-shaped groove 9 is provided at both the upper and lower ends of the middle of the rear surface of the front sand core 7, an annular column cavity 3 14 is provided above the other end of the rear surface of the front sand core 7, a fourth column core 11 is fixedly connected to the middle of the inner side of the annular column cavity 3 14, an annular column cavity 2 13 is provided obliquely below the annular column cavity 3 14, a third column core 10 is fixedly connected to the middle of the inner side of the annular column cavity 2 13.

[0021] In this embodiment: when the front sand core 7 is docked and stuck to the middle sand core 1, the second column core 8, the third column core 10 and the fourth column core 11 will be stuck to the outer surface of the front side of the cavity core 3. When the column core generates an extrusion force on the cavity core 3, the pressure is dispersed by the arched curvature of the outer surface of the cavity core 3 to prevent the pressure concentration from damaging the contact surface of the cavity core 3. When the casting liquid is cast into a thick casting cavity between the inner wall of the middle sand core 1 and the outer surface of the cavity core 3, a water jacket shell is formed. When the liquid is cast into the shaping groove 15, a liquid drainage arc plate is formed. When the liquid is cast into the annular column cavity 12, the annular column cavity 2 13 and the annular column cavity When the three 14 are formed, a water injection pipe will be shaped. When the liquid is cast into the arc groove 9, a positioning card will be formed. When the liquid is cast into the mortise 5, a mounting tenon will be shaped. When the liquid is cast into the groove 6, a limiting clamp will be formed. The shape of the inner wall of the water jacket formed by casting is the shape of the outer surface of the cavity core 3. When the water flows into the water jacket through the water injection pipe, the water flows along the arc with the same curvature as the inner wall and the outer surface of the cavity core 3 and enters the circulating liquid inlet opened between the liquid drainage arc plates. Under the guidance of the liquid drainage arc plates, the water flows to the outside of the cylinder head shell formed by the first column core to dissipate the heat emitted by the cylinder head provided inside the cylinder head shell.

[0022] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An engine cylinder head water jacket sand core structure, comprising a middle sand core (1), characterized in that: The upper surface of the middle sand core (1) is fixedly connected to a cavity core (3), a plurality of first column cores (2) are evenly arranged on the rear side of the cavity core (3), a shaping groove (15) is opened in the middle of the upper surface of the cavity core (3), and a thickness casting cavity is formed between the inner wall of the middle sand core (1) and the outer surface of the cavity core (3).

2. The engine cylinder head water jacket sand core structure according to claim 1, characterized in that: A rear sand core (4) is provided at the rear side of the middle sand core (1), and a plurality of tongue and grooves (5) are provided in the middle of the front surface of the rear sand core (4).

3. The engine cylinder head water jacket sand core structure according to claim 2, characterized in that: A groove (6) is provided at both left and right ends of the front surface of the rear sand core (4).

4. The engine cylinder head water jacket sand core structure according to claim 1, characterized in that: A front sand core (7) is provided on the front side of the middle sand core (1), and an annular column cavity (12) is provided below one end of the rear surface of the front sand core (7).

5. The engine cylinder head water jacket sand core structure according to claim 4, characterized in that: A second column core (8) is fixedly connected to the middle of the inner side of the annular column cavity (12), and an arc-shaped groove (9) is provided at both upper and lower ends of the middle of the rear surface of the front sand core (7).

6. The engine cylinder head water jacket sand core structure according to claim 4, characterized in that: An annular column cavity three (14) is provided above the other end of the rear surface of the front sand core (7), and a fourth column core (11) is fixedly connected to the middle of the inner side of the annular column cavity three (14).

7. The engine cylinder head water jacket sand core structure according to claim 6, characterized in that: An annular column cavity 2 (13) is provided obliquely below the annular column cavity 3 (14), and a third column core (10) is fixedly connected to the middle portion of the inner side of the annular column cavity 2 (13).

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