An engine block having an optimized main bearing cap structure

Abstract

The utility model discloses an engine cylinder with optimized main bearing cover structure relates to engine field. This engine cylinder with optimized main bearing cover structure, including cylinder main body and main bearing cover main part, the bottom both sides of cylinder main body are all seted up with the mounting slot, the mounting slot is by cooperation top wall and cooperation side wall is composed, and the top both ends of main bearing cover main part are installed in the mounting slot of two sides respectively. This engine cylinder with optimized main bearing cover structure, and the contact area adjustment of optimized cooperation surface is 59.5mm square, and the unit area contact stress adjustment is 230N / mm square, and it is lower than the yield strength 300N / mm square of the cylinder main body of aluminium alloy material, and while aiming at the material difference of the cylinder main body of aluminium alloy material and the main bearing cover main part of nodular cast iron material, realizes load distribution through the slope design of 60 DEG, and the axial component force is borne by the cylinder, and the radial component force is borne by the high -strength main bearing cover, avoids aluminium alloy overload.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, specifically to an engine cylinder block with an optimized main bearing cap structure. Background Technology

[0002] In engine manufacturing, the assembly quality of the cylinder block and main bearing cap directly affects the overall performance and reliability of the engine. Traditional assembly processes often result in assembly difficulties and crushing of mating surfaces after assembly, especially when the cylinder block is made of aluminum alloy and the main bearing cap is made of ductile iron, as the crushing problem is more pronounced due to the significant differences in the material properties of the two materials.

[0003] Aluminum alloys have advantages such as low density and good corrosion resistance, but their strength and hardness are relatively low. Ductile iron, on the other hand, has high strength, high toughness, and good wear resistance. During assembly, if the mating surfaces are poorly designed or the assembly force is not properly controlled, the mating surfaces of the aluminum alloy cylinder block are prone to crushing due to excessive assembly force, leading to a decrease in cylinder block strength and even engine failure.

[0004] To address these issues, traditional methods often involve adjusting assembly process parameters or increasing the thickness of the cylinder block material. However, these methods are often limited in effectiveness and may bring other negative consequences, such as reduced assembly efficiency and increased costs. Therefore, there is an urgent need for an optimized design scheme that can both ensure assembly quality and improve assembly efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an engine cylinder block with an optimized main bearing cap structure. This solves the problem that while aluminum alloys have advantages such as low density and good corrosion resistance, their strength and hardness are relatively low. Ductile iron, on the other hand, possesses high strength, high toughness, and good wear resistance. During assembly, if the mating surface design is unreasonable or the assembly force is not properly controlled, the mating surfaces of the aluminum alloy cylinder block are prone to crushing due to excessive assembly force, leading to a decrease in cylinder block strength and even engine malfunction.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an engine cylinder block with an optimized main bearing cap structure, comprising:

[0007] The cylinder body has mounting grooves on both sides of its bottom, and the mounting grooves are composed of a mating top wall and a mating side wall.

[0008] The main bearing cover body has its top two ends respectively installed in the mounting grooves on both sides. The top of the main bearing cover body is provided with a contact surface, and the top side of the main bearing cover body is provided with a mating surface. An inclined surface is provided between the contact surface and the mating surface. The mating height of the mating surface is 3.5mm, and the inclination angle of the inclined surface is 60°.

[0009] Preferably, the contact surface fits tightly against the mating top wall.

[0010] Preferably, the mating surface is in close contact with the mating sidewall.

[0011] Preferably, the length of the mating surface is 17 mm, and the interference contact area between the mating surface and the mating sidewall is 59.5 mm². 2 .

[0012] Preferably, the average contact stress caused by the interference fit between the mating surface and the mating sidewall is 230 N / mm². 2 .

[0013] Preferably, the coefficient of friction between the mating surface and the mating sidewall is 0.15, and the pressing force of the equipment is 2052.75N.

[0014] Preferably, the angle between the mating top wall and the mating side wall is provided with an arc surface.

[0015] Preferably, the bottom of the cylinder body is provided with a first semi-circular hole.

[0016] Preferably, the top of the main bearing cover body is provided with a second semi-circular hole, and the first semi-circular hole and the second semi-circular hole form a main shaft hole.

[0017] This utility model discloses an engine cylinder block with an optimized main bearing cap structure, which has the following beneficial effects:

[0018] The engine block with an optimized main bearing cap structure has an optimized mating surface contact area of ​​59.5 mm² and a unit area contact stress of 230 N / mm², which is lower than the yield strength of 300 N / mm² of the aluminum alloy cylinder block body. At the same time, in response to the material difference between the aluminum alloy cylinder block body and the ductile iron main bearing cap body, a 60° inclined surface design is used to achieve load distribution. The axial force is borne by the cylinder block, and the radial force is borne by the high-strength main bearing cap, avoiding overload of the aluminum alloy and thus reducing the crush rate of the aluminum alloy cylinder block body. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a partial assembly diagram of the present invention;

[0022] Figure 3 This is a partial schematic diagram of the cylinder body of this utility model;

[0023] Figure 4 This is a schematic diagram of the main bearing cover of this utility model.

[0024] In the figure: 1. Cylinder body; 11. Mounting groove; 111. Top wall; 112. Side wall; 12. First semi-circular hole; 2. Main bearing cap body; 21. Contact surface; 22. Mating surface; 23. Inclined surface; 24. Second semi-circular hole. Detailed Implementation

[0025] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0026] This utility model discloses an engine cylinder block with an optimized main bearing cap structure.

[0027] According to the appendix Figure 1-4 As shown, it includes:

[0028] The cylinder body 1 has mounting grooves 11 on both sides of its bottom. The mounting grooves 11 are composed of a mating top wall 111 and a mating side wall 112.

[0029] The main bearing cover body 2 has its top two ends installed in the mounting grooves 11 on both sides. The top of the main bearing cover body 2 is provided with a contact surface 21, and the top side of the main bearing cover body 2 is provided with a mating surface 22. An inclined surface 23 is provided between the contact surface 21 and the mating surface 22. The mating height of the mating surface 22 is 3.5mm, and the inclination angle of the inclined surface 23 is 60°.

[0030] The optimized mating surface 22 has a contact area of ​​59.5 mm² and a contact stress per unit area of ​​230 N / mm², which is lower than the yield strength of the aluminum alloy cylinder body 1 (300 N / mm²). In addition, considering the material difference between the aluminum alloy cylinder body 1 and the ductile iron main bearing cap body 2, a 60° inclined surface 23 is designed to distribute the load. The axial force is borne by the cylinder body, and the radial force is borne by the high-strength main bearing cap, thus avoiding overload of the aluminum alloy and reducing the crushing rate of the aluminum alloy cylinder body 1.

[0031] Furthermore, the contact surface 21 is in close contact with the mating top wall 111.

[0032] Furthermore, the mating surface 22 is in close contact with the mating sidewall 112.

[0033] Furthermore, the length of the mating surface 22 is 17 mm, and the interference contact area between the mating surface 22 and the mating sidewall 112 is 59.5 mm. 2 .

[0034] Furthermore, the average contact stress caused by the interference fit between the mating surface 22 and the mating sidewall 112 is 230 N / mm². 2 .

[0035] Furthermore, the coefficient of friction between the mating surface 22 and the mating sidewall 112 is 0.15, and the pressing force of the equipment is 2052.75N.

[0036] Furthermore, an arc surface 113 is provided at the angle between the top wall 111 and the side wall 112.

[0037] Furthermore, a first semi-circular hole 12 is provided at the bottom of the cylinder body 1.

[0038] Furthermore, a second semicircular hole 24 is provided on the top of the main bearing cover body 2, and the first semicircular hole 12 and the second semicircular hole 24 form the main shaft hole.

[0039] The optimized mating surface 22 has a contact area of ​​59.5 mm² and a contact stress per unit area of ​​230 N / mm², which is lower than the yield strength of the aluminum alloy cylinder body 1 (300 N / mm²). In addition, considering the material difference between the aluminum alloy cylinder body 1 and the ductile iron main bearing cap body 2, a 60° inclined surface 23 is designed to distribute the load. The axial force is borne by the cylinder body, and the radial force is borne by the high-strength main bearing cap, thus avoiding overload of the aluminum alloy and reducing the crushing rate of the aluminum alloy cylinder body 1.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An engine block with an optimized main bearing cap structure, characterized in that, include: The cylinder body (1) has mounting grooves (11) on both sides of its bottom. The mounting grooves (11) are composed of a mating top wall (111) and a mating side wall (112). The main bearing cover body (2) has its top two ends installed in the mounting grooves (11) on both sides. The top of the main bearing cover body (2) is provided with a contact surface (21), and the top side of the main bearing cover body (2) is provided with a mating surface (22). An inclined surface (23) is provided between the contact surface (21) and the mating surface (22). The mating height of the mating surface (22) is 3.5 mm, and the inclination angle of the inclined surface (23) is 60°.

2. An engine block with an optimized main bearing cap structure according to claim 1, characterized in that, The contact surface (21) is in close contact with the mating top wall (111).

3. An engine block with an optimized main bearing cap structure according to claim 1, characterized in that, The mating surface (22) is in close contact with the mating sidewall (112).

4. An engine block with an optimized main bearing cap structure according to claim 1, characterized in that, The length of the mating surface (22) is 17 mm, and the interference contact area between the mating surface (22) and the mating sidewall (112) is 59.5 mm. 2 .

5. An engine block with an optimized main bearing cap structure according to claim 1, characterized in that, The average contact stress caused by the interference fit between the mating surface (22) and the mating sidewall (112) is 230 N / mm². 2 .

6. An engine block with an optimized main bearing cap structure according to claim 1, characterized in that, The friction coefficient of the mating surface (22) and the mating sidewall (112) is 0.15, and the pressing force of the equipment is 2052.75N.

7. An engine block with an optimized main bearing cap structure according to claim 1, characterized in that, An arc surface (113) is provided at the angle between the mating top wall (111) and the mating side wall (112).

8. An engine block with an optimized main bearing cap structure according to claim 1, characterized in that, The bottom of the cylinder body (1) is provided with a first semi-circular hole (12).

9. An engine block with an optimized main bearing cap structure according to claim 8, characterized in that, The top of the main bearing cover body (2) is provided with a second semi-circular hole (24), and the first semi-circular hole (12) and the second semi-circular hole (24) form the main shaft hole.

Images