Engine cylinder block, engine and vehicle

Abstract

The utility model discloses an engine cylinder block, an engine and a vehicle. The engine cylinder block comprises a cylinder block body, and the cylinder block body comprises a plurality of cylinder holes arranged in the first direction; the cylinder hole is in sliding fit with an engine piston in the second direction; wherein the second direction is the axis direction of the cylinder hole, and the first direction is perpendicular to the second direction; the weight reducing hole is formed in the hole wall between any two adjacent cylinder holes; in the second direction, the first surface of the weight reducing hole is located between the first position and the second position; wherein the first surface is the surface of one side, deviating from the bottom of the cylinder hole, of the lightening hole; the distance between the first position and the bottom of the cylinder hole is configured to be the distance between one side plane, close to the bottom of the cylinder hole, of the three-ring groove of the piston and the bottom of the cylinder hole when the piston runs to a lower dead center; and the distance between the second position and the bottom of the cylinder hole is configured to be the distance between the piston pin mounting part of the piston and the bottom of the cylinder hole when the piston runs to a lower dead center. The engine cylinder block can reduce the weight of the cylinder hole wall.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine cylinder, an engine, and a vehicle. Background Art

[0002] Many existing engines utilize a liner-less engine block. To ensure cylinder bore wall rigidity and prevent deformation, the wall thickness between the cylinder bores is typically thicker. However, during engine operation, the cylinder bore is primarily subjected to force at the point of contact between the piston and the bore wall, while other areas of the bore are subject to less force. This results in redundant cylinder bore wall thickness, resulting in excessive engine weight and high manufacturing costs. Utility Model Content

[0003] The present application discloses an engine cylinder block, an engine and a vehicle, which can reduce the weight of the cylinder bore wall while ensuring the rigidity of the cylinder bore, thereby achieving the purpose of reducing costs.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides an engine cylinder block, comprising:

[0006] A cylinder body, the cylinder body comprising a plurality of cylinder holes arranged along a first direction; the cylinder holes being adapted to slide with the engine piston along a second direction; wherein the second direction is the axial direction of the cylinder holes, and the first direction is perpendicular to the second direction;

[0007] A weight reduction hole is provided on the hole wall between any two adjacent cylinder holes; along the second direction, the first surface of the weight reduction hole is located between the first position and the second position; wherein, the first surface is the side surface of the weight reduction hole facing away from the bottom of the cylinder hole; the distance between the first position and the bottom of the cylinder hole is configured as the distance between the plane of the three-ring groove of the piston close to the bottom of the cylinder hole and the bottom of the cylinder hole when the piston runs to the bottom dead center; the distance between the second position and the bottom of the cylinder hole is configured as the distance between the surface of the piston pin mounting part of the piston facing away from the bottom of the cylinder hole and the bottom of the cylinder hole when the piston runs to the bottom dead center.

[0008] The cylinder body of the above-mentioned engine cylinder block includes a plurality of cylinder bores arranged along a first direction. The interior of the cylinder bore is used for sliding connection with a piston, which can reciprocate along a second direction, the second direction being the axial direction of the cylinder bore, and the first direction being perpendicular to the second direction. A weight-reducing hole is provided on the bore wall between any two adjacent cylinder bores, with the first surface of the weight-reducing hole located between a first position and a second position. The first surface is the surface of the weight-reducing hole facing away from the bottom of the cylinder bore. The distance between the first position and the bottom of the cylinder bore is configured to be the distance between the plane of the piston's three-ring groove near the bottom of the cylinder bore and the bottom of the cylinder bore when the piston reaches bottom dead center. The distance between the second position and the bottom of the cylinder bore is configured to be the distance between the surface of the piston pin mounting portion facing away from the bottom of the cylinder bore and the bottom of the cylinder bore when the piston reaches bottom dead center. By providing weight-reducing holes on the bore wall between any two adjacent cylinder bores, the present application can reduce the weight of the inter-cylinder engine block, thereby achieving the purpose of reducing costs. Furthermore, the first surface of the weight-reducing hole is located between the first position and the second position, which can maximize the size of the weight-reducing hole and further reduce the weight of the inter-cylinder engine block. Since the weight-reducing hole is arranged on the hole wall between two adjacent cylinder holes, rather than being arranged in the main interaction area between the piston and the cylinder hole wall, the rigidity of the cylinder hole can be guaranteed during the operation of the piston.

[0009] In some embodiments, when the piston moves to the bottom dead center, a vertical distance between the first surface of the weight-reducing hole and the first position along the second direction is greater than or equal to 5 mm.

[0010] In some embodiments, the outer wall of the weight-reducing hole facing the piston is arc-shaped.

[0011] In a second aspect, the present application provides an engine, comprising: a piston and an engine cylinder block as described in the first aspect;

[0012] The piston comprises a piston body and a piston pin mounting portion which are fixedly connected; the piston pin mounting portion is arranged on the side of the piston body facing the bottom of the cylinder hole;

[0013] The piston body includes three ring grooves, and the three ring grooves are arranged on the peripheral side of the outer wall of the piston body;

[0014] The piston body includes a frustum, which is arranged on one side of the piston body close to the piston pin mounting portion; along the second direction, the radial dimension of the frustum gradually decreases;

[0015] When the piston moves to the bottom dead center, the outer wall of the weight-reducing hole of the engine cylinder body facing the piston is matched with the outer contour of the frustum.

[0016] In some embodiments, the piston pin mounting portion has a piston pin hole, the axial direction of the piston pin hole is parallel to the first direction; the dimension of the weight reduction hole along the third direction is smaller than the radial dimension of the piston pin hole; wherein, the first direction, the second direction and the third direction are perpendicular to each other.

[0017] In some embodiments, when the piston is at the bottom dead center, the size of the piston pin hole exposed from the bottom of the cylinder hole is 1 / 3-1 / 2 of the diameter of the piston pin hole.

[0018] In some embodiments, the engine further comprises a connecting rod accommodating cavity, wherein the connecting rod accommodating cavity is in communication with a cylinder hole of the engine cylinder block;

[0019] The weight-reducing hole is arranged at the connection between the cavity wall of the connecting rod accommodating cavity and the hole wall of the cylinder hole. The cavity wall of the connecting rod accommodating cavity has a blowby hole, and the blowby hole is communicated with the weight-reducing hole.

[0020] In some embodiments, the weight-reducing hole is partially provided on the cavity wall of the connecting rod accommodating cavity.

[0021] In some embodiments, the engine further includes a piston pin, a first support member and a second support member, the piston pin is disposed inside the piston pin hole, and the first support member and the second support member are disposed on opposite sides of the piston pin mounting portion along a third direction.

[0022] In a third aspect, the present application provides a vehicle comprising the engine as described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an engine provided in an embodiment of the present application;

[0024] Figure 2 A schematic structural diagram of a piston provided in an embodiment of the present application;

[0025] Figure 3 A schematic side view of an engine according to an embodiment of the present application;

[0026] Icons: 1. Cylinder body; 2. Cylinder bore; 3. Piston; 301. Main thrust side; 302. Auxiliary thrust side; 31. Piston body; 311. Three-ring groove; 312. Cone; 32. Piston pin mounting portion; 321. Piston pin hole; 322. Piston pin; 4. Weight-reducing hole; 401. Side boundary; 402. Top boundary; 5. Connecting rod accommodating chamber; 51. Blow-by hole; 6. First support member; 7. Second support member; A. First surface; B. Second surface. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0029] First, as Figure 1 As shown, an embodiment of the present application provides an engine cylinder block, comprising:

[0030] The cylinder body 1 includes a plurality of cylinder holes 2 arranged along a first direction. The cylinder holes 2 are configured to slide with the engine piston 3 along a second direction. The second direction is the axial direction of the cylinder hole 2, and the first direction is perpendicular to the second direction.

[0031] The weight reduction hole 4 is arranged on the hole wall between any two adjacent cylinder holes 2; along the second direction, the first surface A of the weight reduction hole 4 is located between the first position and the second position; wherein, the first surface A is the side surface of the weight reduction hole 4 facing away from the bottom of the cylinder hole 2; the distance between the first position and the bottom of the cylinder hole 2 is configured as the distance between the plane of the three-ring groove 311 of the piston 3 close to the bottom of the cylinder hole 2 and the bottom of the cylinder hole 2 when the piston 3 runs to the bottom dead center; the distance between the second position and the bottom of the cylinder hole 2 is configured as the distance between the surface of the piston pin mounting part 32 of the piston 3 facing away from the bottom of the cylinder hole 2 and the bottom of the cylinder hole 2 when the piston 3 runs to the bottom dead center.

[0032] The cylinder body 1 of the engine cylinder block includes a plurality of Figure 1 The cylinder holes 2 are arranged in the x direction. The interior of the cylinder hole 2 is used for sliding connection with the piston 3, and the piston 3 can move along the second direction ( Figure 1The first direction is the y-direction, and the second direction is the axial direction of the cylinder bore 2. The first direction is perpendicular to the second direction. A weight-reducing hole 4 is provided on the wall between any two adjacent cylinder bores 2. The first surface A of the weight-reducing hole 4 is located between the first position and the second position. The first surface A is the side surface of the weight-reducing hole 4 facing away from the bottom of the cylinder bore 2. The distance between the first position and the bottom of the cylinder bore 2 is configured as the distance between the plane of the three-ring groove 311 of the piston 3 close to the bottom of the cylinder bore 2 and the bottom of the cylinder bore 2 when the piston 3 reaches the bottom dead center. The distance between the second position and the bottom of the cylinder bore 2 is configured as the distance between the surface of the piston pin mounting portion 32 of the piston 3 facing away from the bottom of the cylinder bore 2 and the bottom of the cylinder bore 2 when the piston 3 reaches the bottom dead center. The present application can reduce the weight of the inter-cylinder body by providing a weight-reducing hole 4 on the wall between any two adjacent cylinder bores 2, thereby achieving the purpose of reducing costs. In addition, the first surface A of the weight-reducing hole 4 is provided between the first position and the second position, which can maximize the size of the weight-reducing hole 4 and further reduce the weight of the inter-cylinder body. Since the weight-reducing hole 4 is arranged on the hole wall between two adjacent cylinder holes 2, rather than being arranged in the main action area between the piston 3 and the hole wall of the cylinder hole 2, the rigidity of the cylinder hole 2 during the operation of the piston 3 can be guaranteed.

[0033] In some embodiments, when the piston 3 runs to the bottom dead center, it moves in the second direction ( Figure 1 In the y direction), the vertical distance between the first surface A of the weight-reducing hole 4 and the first position is greater than or equal to 5 mm.

[0034] One possible implementation method is Figure 1 As shown, when the piston 3 runs to the bottom dead center, it moves in the second direction ( Figure 1 In the y-direction, the vertical distance between the first surface A of the weight-reducing hole 4 and the first position is h, and h is greater than or equal to 5 mm. For example, the vertical distance between the first surface A of the weight-reducing hole 4 and the first position is 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6 mm, 6.1 mm, 6.3 mm, etc., and the specific values ​​are not limited. This arrangement can ensure that the piston 3 effectively fits the wall of the cylinder bore 2, and will not cause jamming during the operation of the piston 3, thereby ensuring the normal use of the piston 3.

[0035] In some embodiments, as Figure 1 As shown, the outer wall of the weight-reducing hole 4 facing the piston 3 is arc-shaped.

[0036] Second, as Figure 1-Figure 3 As shown, an embodiment of the present application provides an engine, comprising a piston 3 and an engine cylinder block of the first aspect;

[0037] The piston 3 includes a piston body 31 and a piston pin mounting portion 32 that are fixedly connected; the piston pin mounting portion 32 is provided on the side of the piston body 31 that faces the bottom of the cylinder bore 2;

[0038] The piston body 31 includes three annular grooves 311 , which are arranged on the outer peripheral side of the piston body 31 ;

[0039] The piston body 31 includes a truncated cone 312, which is arranged on one side of the piston body 31 close to the piston pin mounting portion 32; along the second direction ( Figure 1 When the piston 3 reaches the bottom dead center, the outer wall of the weight-reducing hole 4 facing the piston 3 matches the outer contour of the cone 312.

[0040] The above engine includes a piston 3 and an engine cylinder. The engine cylinder includes a cylinder body 1, and the cylinder body 1 includes a plurality of Figure 1 The cylinder holes 2 are arranged in the x direction. The piston 3 is slidably connected to the inside of the cylinder hole 2. The piston 3 can move along the second direction ( Figure 1 The first direction is the y direction, the second direction is the axial direction of the cylinder bore 2, and the first direction is perpendicular to the second direction. The piston 3 includes a piston body 31 and a piston pin mounting portion 32, which are fixedly connected. The piston pin mounting portion 32 is arranged on the side of the piston body 31 facing the bottom of the cylinder bore 2. The piston body 31 includes a three-ring groove 311, and the three-ring groove 311 is arranged on the circumference of the piston body 31. A weight reduction hole 4 is provided on the hole wall between any two adjacent cylinder bores 2. The first surface A of the weight reduction hole 4 is located between the first side of the three-ring groove 311 and the second surface B of the piston pin mounting portion 32, wherein the first surface A is the surface of the weight reduction hole 4 away from the bottom of the cylinder bore 2, the second surface B is the surface of the piston pin mounting portion 32 facing the piston body 31, and the first side is the side of the three-ring groove 311 close to the piston pin mounting portion 32. This application reduces the weight of the inter-cylinder body by providing a weight-reducing hole 4 on the wall between any two adjacent cylinder bores 2, thereby achieving the goal of reducing costs. Furthermore, the first surface A of the weight-reducing hole 4 is provided between the first side of the triple-ring groove 311 and the second surface B of the piston pin mounting portion 32, thereby maximizing the size of the weight-reducing hole and further reducing the weight of the inter-cylinder body. Because the weight-reducing hole 4 is provided on the wall between two adjacent cylinder bores 2, rather than in the primary interaction area between the piston 3 and the wall of the cylinder bore 2, the rigidity of the cylinder bore 2 during operation of the piston 3 is ensured. Furthermore, by providing a conformal design on the outer wall of the weight-reducing hole 4 to match the outer contour of the cone 312, the weight of the inter-cylinder body can be reduced while ensuring the required fit of the piston 3 and the rigidity of the cylinder bore 2, further reducing costs.

[0041] In some embodiments, when the piston 3 runs to the bottom dead center, it moves in the second direction ( Figure 1In the y direction), the vertical distance between the first surface A of the weight-reducing hole 4 and the first side of the three-annular groove 311 is greater than or equal to 5 mm.

[0042] One possible implementation method is Figure 1 As shown, when the piston 3 runs to the bottom dead center, it moves in the second direction ( Figure 1 In the y-direction, the vertical distance between the first surface A of the weight-reducing hole 4 and the first side of the three-ring groove 311 is h, and h is greater than or equal to 5 mm. For example, the vertical distance between the first surface A of the weight-reducing hole 4 and the first side of the three-ring groove 311 is 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6 mm, 6.1 mm, 6.3 mm, etc., and the specific values ​​are not limited. This arrangement can ensure that the piston 3 effectively fits the wall of the cylinder bore 2, and will not cause jamming during the operation of the piston 3, thereby ensuring the normal use of the piston 3.

[0043] In some embodiments, the piston pin mounting portion 32 has a piston pin hole 321, and the axial direction of the piston pin hole 321 is aligned with the first direction ( Figure 1 The weight-reducing hole 4 is parallel to the third direction ( Figure 1 The dimension in the first direction ( z direction) is smaller than the radial dimension of the piston pin hole 321; Figure 1 x direction), the second direction ( Figure 1 y direction) and the third direction ( Figure 1 z direction) are perpendicular to each other.

[0044] One possible implementation method is Figure 2 As shown, Figure 2 The dotted line in the middle represents the outline of the weight reduction hole 4. Figure 2 It can be seen that the weight reduction hole 4 is along the third direction ( Figure 2 The dimension of the piston pin hole 321 in the z direction is smaller than the radial dimension of the piston pin hole 321. The embodiment of the present application designs the side boundary 401 of the weight reduction hole 4 according to the hole wall boundary of the piston pin hole 321. The side boundary is the side boundary of the weight reduction hole 4 along the third direction ( Figure 2 By setting the dimension of the weight-reducing hole 4 along the third direction to be smaller than the radial dimension of the piston pin hole 321, good contact between the wall of the cylinder bore 2 and the piston 3 can be ensured, ensuring effective support of the cylinder bore 2 wall for the piston, thereby improving structural stability.

[0045] In some embodiments, the outer wall of the weight-reducing hole 4 facing the piston 3 is arc-shaped.

[0046] One possible implementation method is Figure 1As shown, the arc-shaped outer wall of the weight-reducing hole 4 is adapted to the arc-shaped outer contour of the truncated cone 312. Under the premise of ensuring the matching requirements of the piston 3 and the rigidity of the cylinder bore 2, the weight of the engine body can be reduced, further reducing costs. Figure 2 As shown, along the third direction ( Figure 2 The top edge 402 of the weight-reducing hole 4 is designed with a large arc, which can reduce stress concentration and ensure the strength of the cylinder bore 2. At the same time, the vertical distance between the top edge 402 of the weight-reducing hole 4 and the first side of the triple-ring groove 311 is greater than or equal to 5 mm to ensure effective contact between the piston 3 and the wall of the cylinder bore 2, allowing the piston 3 to operate normally.

[0047] In some embodiments, when the piston 3 is at the bottom dead center, the size of the piston pin hole 321 exposed from the bottom of the cylinder hole 2 is 1 / 3-1 / 2 of the diameter of the piston pin hole 321 .

[0048] One possible implementation method is Figure 2 As shown, the bottom boundary line of the cylinder bore 2 is 201. When the piston 3 runs to the bottom dead center, the size of the piston pin hole 321 exposed at the bottom of the cylinder bore 2 is 1 / 3-1 / 2 of the diameter of the piston pin hole 321, such as 1 / 3, 3 / 8, 5 / 12, 11 / 24, 1 / 2, etc. The specific value is not limited, as long as the maximum diameter of the profile near the piston pin hole 321 is ensured not to be exposed at the bottom of the cylinder bore 2. Such a setting can ensure the stability of the piston 3 during operation and avoid shaking. The embodiment of the present application designs the top boundary 402 of the weight reduction hole 4 on the basis of the above, which can reduce the weight of the body between the cylinder bores as much as possible and ensure the normal operation of the piston 3. At the same time, designing the weight reduction hole 4 based on the bottom dead center position can also increase the oil and gas contact area between the piston pin 322 and the connecting rod accommodating cavity 5, thereby improving the lubrication environment of the front and rear ends of the piston pin 322.

[0049] It should be noted that, with other components remaining unchanged, when the piston 3 is at the bottom dead center, if the size of the piston pin hole 321 exposed from the bottom of the cylinder hole 2 is to be 1 / 3-1 / 2 of the diameter of the piston pin hole 321, the bottom of the cylinder hole 2 needs to be designed upward, thereby reducing excess material at the bottom of the cylinder hole 2 and reducing the machining allowance of the cylinder hole 2, which is beneficial to increasing the tool life.

[0050] In some embodiments, the engine also includes a connecting rod accommodating chamber 5, which is connected to the cylinder hole 2; the weight reduction hole 4 is arranged at the connection between the cavity wall of the connecting rod accommodating chamber 5 and the hole wall of the cylinder hole 2, and the cavity wall of the connecting rod accommodating chamber 5 has a blowby hole 51, which is connected to the weight reduction hole 4.

[0051] One possible implementation method is Figure 1 and Figure 3As shown, the connecting rod accommodating chamber 5 is connected to the cylinder hole 2 to facilitate the operation of the piston 3. It can be understood that the embodiment of the present application includes a plurality of connecting rod accommodating chambers 5, and the plurality of connecting rod accommodating chambers 5 correspond one-to-one to the plurality of cylinder holes 2 and are respectively connected. The weight reduction hole 4 is provided at the connection between the cavity wall of the connecting rod accommodating chamber 5 and the hole wall of the cylinder hole 2. The cavity wall of the connecting rod accommodating chamber 5 has a blowby hole 51, and the blowby hole 51 is connected to the weight reduction hole 4. The weight reduction hole 4 of the embodiment of the present application is integrated with the blowby hole 51 and designed to be a communicating structure. As a part of the blowby hole 51, the cross-sectional area of ​​the blowby gas flow between the cylinders is increased, which is beneficial to balancing the pressure of the connecting rod accommodating chamber 5 between the cylinders and improving the pressure between the cylinders.

[0052] In some embodiments, as Figure 1 As shown, the weight-reducing hole 4 is partially provided on the wall of the connecting rod accommodating cavity 5. By partially providing the weight-reducing hole 4 on the wall of the connecting rod accommodating cavity 5, it is beneficial to reduce the wall weight of the connecting rod accommodating cavity 5, and further reduce the weight of the engine body.

[0053] In some embodiments, the engine further includes a piston pin 322, a first support member 6 and a second support member 7, the piston pin 322 is disposed inside the piston pin hole 321, and the first support member 6 and the second support member 7 are arranged along the third direction ( Figure 1 z direction) are arranged on opposite sides of the piston pin mounting portion 32.

[0054] In some embodiments, as Figure 2 As shown, the primary thrust side 301, secondary thrust side 302, first support member 6, and second support member 7 of the piston 3 all contact the wall of the cylinder bore 2. During operation, the piston 3 transmits the forces received via these portions to the wall of the cylinder bore 2. This embodiment of the present application determines the boundary conditions of the weight-reducing hole 4 based on the force conditions of the cylinder bore 2, which helps ensure the rigidity of the cylinder bore 2 and the structural stability during operation. Furthermore, the weight-reducing hole 4 can be designed as a through hole or a countersunk hole, depending on the rigidity of the cylinder bore 2.

[0055] In a third aspect, an embodiment of the present application provides a vehicle comprising the engine of the second aspect. Since the vehicle comprises all technical features of the engine, the vehicle also comprises all beneficial effects of the engine, which will not be described in detail here.

[0056] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. An engine cylinder block, characterized in that: include: A cylinder body, the cylinder body comprising a plurality of cylinder holes arranged along a first direction; the cylinder holes being adapted to slide with the engine piston along a second direction; wherein the second direction is the axial direction of the cylinder holes, and the first direction is perpendicular to the second direction; A weight reduction hole is provided on the hole wall between any two adjacent cylinder holes; along the second direction, the first surface of the weight reduction hole is located between the first position and the second position; wherein, the first surface is the side surface of the weight reduction hole facing away from the bottom of the cylinder hole; the distance between the first position and the bottom of the cylinder hole is configured as the distance between the plane of the three-ring groove of the piston close to the bottom of the cylinder hole and the bottom of the cylinder hole when the piston runs to the bottom dead center; the distance between the second position and the bottom of the cylinder hole is configured as the distance between the surface of the piston pin mounting part of the piston facing away from the bottom of the cylinder hole and the bottom of the cylinder hole when the piston runs to the bottom dead center.

2. The engine block according to claim 1, wherein: When the piston moves to the bottom dead center, along the second direction, a vertical distance between the first surface of the weight-reducing hole and the first position is greater than or equal to 5 mm.

3. The engine block according to claim 2, wherein: The outer wall of the weight-reducing hole facing the piston is arc-shaped.

4. An engine, characterized in that: comprising a piston and an engine cylinder block according to any one of claims 1 to 3; The piston comprises a piston body and a piston pin mounting portion which are fixedly connected; the piston pin mounting portion is arranged on the side of the piston body facing the bottom of the cylinder hole; The piston body includes three ring grooves, and the three ring grooves are arranged on the peripheral side of the outer wall of the piston body; The piston body includes a frustum, which is arranged on one side of the piston body close to the piston pin mounting portion; along the second direction, the radial dimension of the frustum gradually decreases; When the piston moves to the bottom dead center, the outer wall of the weight-reducing hole of the engine cylinder body facing the piston is matched with the outer contour of the frustum.

5. The engine according to claim 4, characterized in that The piston pin mounting portion has a piston pin hole, the axial direction of the piston pin hole is parallel to the first direction; the size of the weight reduction hole along the third direction is smaller than the radial size of the piston pin hole; wherein, the first direction, the second direction and the third direction are perpendicular to each other.

6. The engine according to claim 5, characterized in that When the piston is located at the bottom dead center, the size of the piston pin hole exposed from the bottom of the cylinder hole is 1 / 3-1 / 2 of the diameter of the piston pin hole.

7. The engine according to claim 4, characterized in that The engine further comprises a connecting rod accommodating chamber, wherein the connecting rod accommodating chamber is in communication with the cylinder hole of the engine cylinder block; The weight-reducing hole is arranged at the connection between the cavity wall of the connecting rod accommodating cavity and the hole wall of the cylinder hole. The cavity wall of the connecting rod accommodating cavity has a blowby hole, and the blowby hole is communicated with the weight-reducing hole.

8. The engine according to claim 7, characterized in that The weight-reducing hole is partially arranged on the cavity wall of the connecting rod accommodating cavity.

9. The engine according to claim 5, characterized in that The engine further includes a piston pin, a first support member and a second support member. The piston pin is disposed inside the piston pin hole. The first support member and the second support member are disposed on opposite sides of the piston pin mounting portion along a third direction.

10. A vehicle, characterized in that: Comprising an engine as described in any one of claims 4-9.

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