Engine block and engine assembly

Abstract

The present disclosure relates to an engine block and an engine assembly, the engine block comprising a main body and flanges formed at front and rear ends of the main body, and a profile of at least one of the flanges at the two ends is configured with an arc-shaped curved surface, which is configured to curve towards the middle from the end of the flange to the direction of the main body. The flange is configured with the arc-shaped curved surface, which can increase the rigidity of the flange on the one hand, and on the other hand, compared with the overall thickened flat structure flange, can effectively reduce the weight of the engine block, greatly improve the modal of the engine block, and improve the stability and reliability application. The engine block in the embodiment of the present disclosure can maximize the material utilization rate, realize the lightweight design of the engine block, and save the cost under the premise of ensuring the low-order stiffness of the engine assembly and improving the NVH performance.

Description

Technical Field

[0001] This disclosure relates to the field of engine technology, and in particular to an engine block and engine assembly. Background Technology

[0002] The engine block is the core structural component of the engine. Its main function is to act as the engine's skeleton, supporting moving parts such as the crankshaft, pistons, and connecting rods, and bearing combustion pressure, inertial forces, and vibration loads. The flanges at both ends of the engine block are primarily used for component connection and fixation, sealing and protection, and load transfer; they are key structures connecting the engine block to surrounding components. For example, the structural design of the rear flange of the engine block is crucial to the connection, sealing, and overall rigidity of the transmission and generator. In related technologies, the design of the rear flange involves thickening the entire flange, which increases the weight of the engine block and has limited improvement on the engine block's modal characteristics. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides an engine block and an engine assembly.

[0004] According to a first aspect of the present disclosure, an engine block is provided, including a main body and flanges formed at both ends of the main body, wherein at least one of the flanges at both ends has an arcuate surface profile configured to converge toward the center in a direction from the end of the flange toward the main body.

[0005] Constructing the flange with an arc-shaped curved surface increases its rigidity. Furthermore, compared to a solid, thickened flange, it effectively reduces the engine block weight, significantly improves the engine block's modal characteristics, and enhances its stability and reliability. The engine block in this embodiment maximizes material utilization, achieving lightweight design and cost savings while ensuring low-order rigidity of the engine assembly and improving NVH performance.

[0006] In some possible implementations, the radius of curvature of the arcuate surface is 50mm to 200mm.

[0007] Setting the radius of curvature of the curved surface within this range ensures both lightweight design and effective improvement of engine block modal characteristics. A radius of curvature less than 50mm results in excessive material usage and excessive engine weight, while a radius of curvature greater than 200mm fails to effectively distribute stress and has little impact on improving engine block modal characteristics.

[0008] In some possible implementations, a plurality of outer reinforcing ribs are formed on the outer surface of the flange, and the plurality of outer reinforcing ribs extend along the outer surface of the arcuate surface in the front-rear direction of the body and extend to the end of the flange.

[0009] The extension direction of the outer reinforcing ribs is consistent with the stress transmission path of the curved surface, which can effectively resist deformation and enhance the overall rigidity of the flange outer surface.

[0010] In some possible implementations, the body has a plurality of attachment structures protruding from it, and at least a portion of the outer reinforcing ribs extend from one end away from the flange end to the attachment structure.

[0011] Extending the outer reinforcing ribs to the accessory structure can establish a force transmission path between the flange end and the accessory structure, and disperse stress concentration through the outer reinforcing ribs.

[0012] In some possible implementations, the outer reinforcing rib is 4mm to 6mm lower than the accessory structure in the protruding direction perpendicular to the extension direction.

[0013] This design avoids interference from the outer reinforcing ribs affecting the installation of accessories. If the outer reinforcing ribs are too low, such as 10mm lower than the accessory structure, their reinforcing effect will be affected. If the outer reinforcing ribs are too high, such as 2mm lower than the accessory structure, they cannot properly avoid interference during accessory installation, and there is still a risk of interference.

[0014] In some possible implementations, at least a portion of the plurality of said outer reinforcing ribs extends from one end of one flange to the end of another flange.

[0015] This integral reinforcing rib structure, which runs through the entire fuselage in the front and rear directions, makes the overall rigidity of the front and rear flanges and the main body stronger, effectively resisting the torsional reaction force when the engine is working.

[0016] In some possible implementations, the width of the outer reinforcing rib in the width direction perpendicular to the extension direction is 5.5mm to 6.5mm.

[0017] This width range ensures the strength of the reinforcing ribs while also fitting the compact layout of the product, avoiding interference with other structures.

[0018] In some possible implementations, a plurality of inner reinforcing ribs are formed on the inner surface of the flange, and the plurality of inner reinforcing ribs extend from the inner surface of the arcuate surface.

[0019] The inner reinforcing ribs can resist compression or shear on the inner surface, improving the body's modal characteristics. The inner and outer reinforcing ribs, through their combination, make the overall stress distribution of the flange more uniform.

[0020] In some possible implementations, two inner reinforcing ribs are provided in the region of the flange corresponding to the cylinder bore of the machine body in the front-rear direction, and the two inner reinforcing ribs are arranged intersectingly.

[0021] By setting two intersecting inner reinforcing ribs in the corresponding cylinder bore area, local stiffness can be enhanced and fatigue damage can be avoided. The cross-shaped structure can disperse the local stress transmitted by the cylinder bore.

[0022] In some possible implementations, the flange has multiple mounting holes, and the inner surface of the flange is formed with multiple radially arranged reinforcing ribs, some of which are angled to the radially arranged reinforcing ribs in the area near the mounting holes.

[0023] The radially arranged reinforcing ribs disperse local stress along the radial direction. The inner reinforcing ribs are connected at an angle to further disperse the stress formed by the mounting holes with greater stress, forming a multi-level dispersion path and extending the fatigue life of the flange.

[0024] In some possible implementations, the width of the inner reinforcing rib in the width direction perpendicular to the extension direction is 5.5mm to 6.5mm.

[0025] This width range ensures the strength of the reinforcing ribs while also fitting the compact layout of the product, avoiding interference with other structures.

[0026] In some possible implementations, the first-order modal frequency of the engine block is 541.6 Hz.

[0027] This first-order modal frequency meets the single-unit modal evaluation standard of the engine body, which is greater than 500Hz, thus avoiding resonance and reducing vibration and noise. According to a second aspect of the present disclosure, an engine assembly is also provided, the engine assembly including the engine block provided in the present disclosure.

[0028] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: constructing the flange with an arc-shaped curved surface can increase the flange's rigidity on the one hand, and on the other hand, compared with a flat flange with overall thickening, it can effectively reduce the weight of the engine block, significantly improve the engine block's modal characteristics, and enhance its stability and reliability. The engine block in the embodiments of this disclosure can maximize material utilization and achieve lightweight design while ensuring the low-order rigidity of the engine assembly and improving NVH performance, thus saving costs.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0031] Figure 1 This is a perspective view of an engine body according to an exemplary embodiment; Figure 2 This is a schematic diagram of the exhaust side of an engine block according to an exemplary embodiment; Figure 3 This is a schematic diagram of the intake side of an engine block according to an exemplary embodiment; Figure 4 This is a schematic diagram of the rear side of an engine block according to an exemplary embodiment; Figure 5 This is a modal analysis diagram of an engine block according to an exemplary embodiment; Figure 6 This is a modal analysis diagram of an engine assembly according to an exemplary embodiment.

[0032] Explanation of reference numerals in the attached figures 10-Main body, 11-Cylinder bore, 20-Flange, 21-Front flange, 22-Rear flange, 200-Arc-shaped surface, 201-Mounting hole, 30-Outer reinforcing rib, 31-First outer reinforcing rib, 32-Second outer reinforcing rib, 33-Third outer reinforcing rib, 34-Fourth outer reinforcing rib, 35-Fifth outer reinforcing rib, 36-Sixth outer reinforcing rib, 37-Seventh outer reinforcing rib, 38-Eighth outer reinforcing rib, 39-Ninth outer reinforcing rib, 40-Accessory structure, 50-Inner reinforcing rib, 51-First inner reinforcing rib, 52-Second inner reinforcing rib, 53-Third inner reinforcing rib, 54-Fourth inner reinforcing rib, 55-Fifth inner reinforcing rib, 60-Radial reinforcing rib. Detailed Implementation

[0033] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0034] The engine block is the core structural component of the engine. Its main function is to act as the engine's skeleton, supporting moving parts such as the crankshaft, pistons, and connecting rods, and bearing combustion pressure, inertial forces, and vibration loads. The flanges at both ends of the engine block are primarily used for component connection and fixation, sealing and protection, and load transfer; they are key structures connecting the engine block to surrounding components. For example, the structural design of the rear flange of the engine block is crucial to the connection, sealing, and overall rigidity of the transmission and generator. In related technologies, the design of the rear flange involves thickening the entire flange, which increases the weight of the engine block and has limited improvement on the engine block's modal characteristics.

[0035] Therefore, this disclosure provides an engine block, with reference to Figures 1 to 4 The engine block includes a main body 10 and flanges 20 formed at the front and rear ends of the main body 10, for example, referring to Figure 2 and Figure 3 The main body 10 has a front flange 21 at its front end and a rear flange 22 at its rear end. At least one of the flanges 20 at both ends has an arcuate surface 200 in its profile. For example, the rear flange 22 may have an arcuate surface 200, or, depending on structural strength requirements, the front flange 21 may also have an arcuate surface 200. The arcuate surface 200 is constructed to curve towards the center from the end of the flange 20 towards the main body 10. Figure 2 Taking the rear flange 22 as an example, the arc-shaped curved surface 200 gradually converges and bends towards the middle from the right end of the rear flange 22 to the left, so that the arc-shaped curved surface 200 is constructed as a hemispherical contour, and both the outer and inner surfaces of the rear flange 22 are constructed as arc-shaped curved surfaces.

[0036] Through the above technical solution, the flange 20 is constructed with an arc-shaped curved surface 200. On the one hand, this increases the rigidity of the flange 20; on the other hand, compared with a flat flange with overall thickening, it can effectively reduce the weight of the engine block, significantly improve the modal characteristics of the engine block, and enhance its stability and reliability. The engine block in this embodiment can maximize material utilization and achieve lightweight design while ensuring the low-order rigidity of the engine assembly and improving NVH performance, thus saving costs.

[0037] In one embodiment, the radius of curvature of the arc-shaped surface 200 is 50mm to 200mm. Setting the radius of curvature of the arc-shaped surface 200 within this range can ensure both lightweight design and effective improvement of engine block modal characteristics. A radius of curvature less than 50mm would result in excessive material and excessive engine block weight, while a radius of curvature greater than 200mm would fail to effectively distribute stress and have little impact on improving engine block modal characteristics.

[0038] In this embodiment, the engine block's modal characteristics can also be improved by adding reinforcing ribs. In related technologies, the arrangement of flange reinforcing ribs is typically a uniform radial empirical arrangement, without considering the engine block's vibration characteristics or optimizing the engine assembly's modal characteristics, resulting in low material utilization. In this embodiment, by combining the engine block's vibration characteristics and the engine assembly's modal analysis, reinforcing ribs are designed specifically to effectively improve the engine block's modal characteristics while minimizing material usage.

[0039] Reference Figures 1 to 3 Multiple outer reinforcing ribs 30 may be formed on the outer surface of the flange 20, such as a first outer reinforcing rib 31, a second outer reinforcing rib 32, a third outer reinforcing rib 33, a fourth outer reinforcing rib 34, a fifth outer reinforcing rib 35, a sixth outer reinforcing rib 36, a seventh outer reinforcing rib 37, an eighth outer reinforcing rib 38, and a ninth outer reinforcing rib 39. These multiple outer reinforcing ribs 30 may extend along the outer surface of the arc-shaped curved surface 200 in the front-rear direction of the body, and may extend to the end of the flange 20. The extension direction of the outer reinforcing ribs 30 is consistent with the stress transmission path of the arc-shaped curved surface 200, which can effectively resist deformation and enhance the overall rigidity of the flange's outer surface.

[0040] Reference Figure 2 and Figure 3 Multiple accessory structures 40 may protrude from the main body 10. These accessory structures 40 may be formed on the outer surface of the main body 10 for mounting intake and exhaust manifolds or as liquid flow channels. At least a portion of the outer reinforcing ribs 30 extend from the end furthest from the flange 20 to the accessory structure 40. For example, Figure 2 The first outer reinforcing rib 31, the third outer reinforcing rib 33, the fourth outer reinforcing rib 34, the fifth outer reinforcing rib 35, the sixth outer reinforcing rib 36, and the ninth outer reinforcing rib 39 shown can all extend to the accessory structure 40. Extending the outer reinforcing ribs 30 to the accessory structure 40 establishes a force transmission path between the end of the flange 20 and the accessory structure 40, dispersing stress concentration through the outer reinforcing ribs 30. In other embodiments, the end of the outer reinforcing rib 30 away from the end of the flange 20 can also extend to the reinforcing rib of the body 10.

[0041] In this embodiment, in the protruding direction perpendicular to the extension direction of the outer reinforcing rib 30, that is, in the direction in which the outer reinforcing rib 30 protrudes from the outer surface of the main body 10, the outer reinforcing rib 30 can be set to be 4mm to 6mm lower than the accessory structure 40, such as 5mm lower. This setting can avoid the outer reinforcing rib 30 interfering with the installation of the accessory. If the outer reinforcing rib 30 is too low, such as 10mm lower than the accessory structure 40, its reinforcing effect will be affected. If the outer reinforcing rib 30 is too high, such as 2mm lower than the accessory structure 40, it cannot properly avoid the installation of the accessory, and there is still a risk of interference.

[0042] In this embodiment of the present disclosure, at least a portion of the plurality of outer reinforcing ribs 30 may extend from the end of one flange 20 to the end of another flange 20. For example, in Figure 3 In this configuration, the seventh outer reinforcing rib 37 and the eighth outer reinforcing rib 38 can extend between the ends of the two flanges 20. These reinforcing ribs can be arranged in two ways: either the seventh outer reinforcing rib 37 inserts the accessory structure 40 along its extension path, or the eighth outer reinforcing rib 38 extends into a single, continuous reinforcing rib. This integrated reinforcing rib structure, running the entire length of the engine body, enhances the overall rigidity of the front and rear flanges and the main body 10, effectively resisting the torsional reaction force during engine operation.

[0043] In this embodiment, multiple inner reinforcing ribs 50 can be formed on the inner surface of the flange 20. These inner reinforcing ribs 50 extend along the inner surface of the arcuate surface 200 and may include a first inner reinforcing rib 51, a second inner reinforcing rib 52, a third inner reinforcing rib 53, a fourth inner reinforcing rib 54, and a fifth inner reinforcing rib 55. The inner reinforcing ribs 50 can resist compression or shearing of the inner surface, improving the body's modal characteristics. The inner reinforcing ribs 50 and the outer reinforcing ribs 30 are combined internally and externally, resulting in a more uniform stress distribution on the flange 20 as a whole.

[0044] Reference Figure 4 Two inner reinforcing ribs 50 can be provided in the region of the flange 20 corresponding to the cylinder bore 11 along the front-rear direction. The two inner reinforcing ribs 50 are arranged intersectingly, for example, the first inner reinforcing rib 51 and the second inner reinforcing rib 52 are arranged intersectingly. In this embodiment of the present disclosure, the flange with such an arc-shaped curved surface 200 will result in a thinner wall of the adjacent cylinder bore. Therefore, in this embodiment of the present disclosure, by providing two intersecting inner reinforcing ribs in the region corresponding to the cylinder bore, the local stiffness can be enhanced, fatigue damage can be avoided, and the cross-shaped structure can disperse the local stress transmitted by the cylinder bore.

[0045] Flange 20 has multiple mounting holes 201 for mounting structures such as flywheel housings. Bolt preload creates stress around the mounting holes 201. Multiple uniformly radiating radial reinforcing ribs 60 can be formed on the inner surface of flange 20, dispersing localized stress radially. Some inner reinforcing ribs 50 near the mounting holes 201 can be angled to the radial reinforcing ribs 60 to further disperse the stress generated by the heavily stressed mounting holes, creating multi-level stress dispersion paths and extending the fatigue life of flange 20. For example, the third inner reinforcing rib 53, the fourth inner reinforcing rib 54, and the fifth inner reinforcing rib 55 are angled to the radial reinforcing ribs 60.

[0046] In this embodiment, the width of the outer reinforcing rib 30 or the inner reinforcing rib 50 in the width direction perpendicular to their respective extension direction can be 5.5mm to 6.5mm, such as 6mm. This width range ensures the strength of the reinforcing rib while also adapting to the compact layout of the product and avoiding interference with other structures.

[0047] Through the structural optimization of flange 20 in this embodiment, the design of the arc-shaped curved surface 200 can reduce weight while meeting stiffness requirements. The design of the reinforcing ribs effectively enhances the stiffness and strength of the flange, enabling it to remain stable under high loads and high speeds, thus improving the modal characteristics of the engine block. (Refer to...) Figure 5 The first-order modal frequency of the engine block can reach 541.6Hz, which meets the single-unit modal evaluation standard of the engine block greater than 500Hz, avoids resonance, and reduces vibration and noise.

[0048] According to a second aspect of the present disclosure, an engine assembly is provided that includes the engine block described above and has all the beneficial effects of the engine block. (Refer to...) Figure 6 The diagram shows the modal analysis of the engine assembly in this embodiment. The first bending mode of the engine assembly can reach 208Hz, which is about 10Hz higher than that of the engine assembly in the prior art, and can effectively reduce the vibration and noise of the whole machine.

[0049] In the above detailed description, reference has been made to the accompanying drawings, which illustrate specific aspects of this disclosure by way of illustration. In this regard, terms indicating direction or positional relationship, such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential,” are used with reference to the orientation of the described figures. Since components of the described device can be positioned in multiple different orientations, directional terms are used for illustrative purposes and not for limitation. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of this disclosure. Therefore, the following detailed description should not be considered limiting.

[0050] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term “and / or” includes any one of the relevant listed items and any combination of any two or more; similarly, “at least one of…” includes any one of the relevant listed items and any combination of any two or more.

[0051] It should be understood that, unless otherwise expressly specified and limited, the terms "joining," "attaching," "installing," "connecting," "linking," "fixing," etc., used in the embodiments of this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms herein based on the specific circumstances.

[0052] Furthermore, the term "above" as used herein with respect to components, elements, or material layers formed or located "above" a surface may be used to indicate that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are arranged between the surface and the component, element, or material layer. However, the term "above" as used with respect to components, elements, or material layers formed or located "above" a surface may also optionally have a specific meaning: that the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, for example, in direct contact with the surface.

[0053] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0055] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0056] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding the specification and drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous for any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0057] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0058] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An engine block, characterized in that, The device includes a body and flanges formed at both ends of the body. At least one of the flanges at both ends has an arcuate surface profile, which is configured to bend towards the center from the end of the flange toward the body.

2. The engine block according to claim 1, characterized in that, The radius of curvature of the arc-shaped surface is 50mm~200mm.

3. The engine block according to claim 1, characterized in that, Multiple outer reinforcing ribs are formed on the outer surface of the flange. These multiple outer reinforcing ribs extend along the outer surface of the arc-shaped surface in the front-rear direction of the body and extend to the end of the flange.

4. The engine block according to claim 3, characterized in that, The main body has a plurality of attachment structures protruding therefrom, and at least a portion of the outer reinforcing ribs extend from the flange end to the attachment structure.

5. The engine block according to claim 4, characterized in that, In the protruding direction perpendicular to the extension direction of the outer reinforcing rib, the outer reinforcing rib is 4mm to 6mm lower than the accessory structure.

6. The engine block according to claim 3, characterized in that, At least a portion of the plurality of said outer reinforcing ribs extends from one end of one flange to the end of another flange.

7. The engine block according to claim 3, characterized in that, In the width direction perpendicular to the extension direction of the outer reinforcing rib, the width of the outer reinforcing rib is 5.5mm to 6.5mm.

8. The engine block according to claim 1, characterized in that, Multiple inner reinforcing ribs are formed on the inner surface of the flange, and the multiple inner reinforcing ribs extend from the inner surface of the arc-shaped curved surface.

9. The engine block according to claim 8, characterized in that, Two inner reinforcing ribs are provided in the region of the flange corresponding to the cylinder bore of the machine body along the front-rear direction, and the two inner reinforcing ribs are arranged intersectingly.

10. The engine block according to claim 8, characterized in that, The flange has multiple mounting holes, and multiple radial reinforcing ribs are formed on the inner surface of the flange in a uniform radial pattern. Some of the inner reinforcing ribs are connected at an angle to the radial reinforcing ribs in the area near the mounting holes.

11. The engine block according to claim 8, characterized in that, In the width direction perpendicular to the extension direction of the inner reinforcing rib, the width of the inner reinforcing rib is 5.5mm to 6.5mm.

12. An engine assembly, characterized in that, Includes the engine block according to any one of claims 1-11.

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