Engine, engine cylinder block and tile cover positioning cambered surface design method and vehicle

Abstract

The present application relates to a method for designing positioning arc surfaces for an engine, an engine cylinder block, and a tile cover, and a vehicle, and relates to the technical field of automobile parts assembly structures, including a tile cover, both ends of which are provided with a first positioning boss, the protruding end of the first positioning boss being provided with a convex arc surface; a cylinder block, the inner side of which is provided with a second positioning boss corresponding to the first positioning boss, the second positioning boss being provided with a concave arc surface corresponding to the convex arc surface, the first positioning boss and the second positioning boss being in contact with each other, and being used to position the tile cover and the cylinder block. Horizontal positioning is achieved through the one-way centering characteristics of the convex arc surface and the concave arc surface, and high stability is ensured through the design of the circular arc surface. The circular arc surface is processed by vertical milling or boring, which is easy to manufacture and has low processing difficulty. It can ensure applicability and stability on the basis of simple processing methods, solving the problem that the three solutions in the prior art are difficult to simultaneously ensure simple processing methods, applicability, and stability.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts assembly structures, and in particular to an engine, an engine cylinder block and a tile cover positioning cambered surface design method and a vehicle. Background Art

[0002] In an engine, the crankshaft hole supports the crankshaft-connecting rod mechanism. During engine operation, the inner wall of the hole is subjected to complex and uneven forces, including loads generated by tightening, crankshaft rotation, and friction. Therefore, the processing accuracy must be high enough to improve its fatigue resistance. The use of a tile-type crankshaft hole can improve its load-bearing capacity and shear resistance, and greatly improve the assembly quality and positioning accuracy. The current assembly process of the crankshaft hole mechanism is to first use certain means to fix the tile cover and cylinder block, then machine the crankshaft hole, then remove the tile cover to install the bearing and crankshaft, and finally reinstall the tile cover and cylinder block. The crankshaft hole is required to have an accuracy of 0.008mm and must be able to recover the accuracy after reassembly. Therefore, the positioning requirements of the tile cover and cylinder block are stronger than those of other components.

[0003] In the existing technology, there are three main positioning solutions for the tile cover and the cylinder body. One is positioning through a positioning ring, which is essentially a traditional "one side two pins" technology. One is side positioning, which is performed through a positioning table or a countersink groove. The other is the crankshaft hole laser breaking technology, which is actually a dry cutting processing method.

[0004] However, when implementing the locating ring solution, each tile cover requires two locating rings for positioning. A 6-cylinder diesel engine needs to process 28 pin holes and 14 locating rings. The processing cost is high and the assembly process is complicated. In addition, due to the increase in the assembly surface, the positioning accuracy and stability are poor, and there are problems of complex processing and difficulty in ensuring stability. When implementing the side positioning method, stress is concentrated at the corners of the positioning table, and the cylinder body is prone to cracking along this area. The undercut groove can avoid stress concentration, but the processing process is complicated. In addition, side positioning cannot be axially positioned and is difficult to use on the thrust bearing seat. There are problems of complex processing and difficulty in ensuring applicability. The expansion and breaking process requires a large amount of equipment, and the laser etching and expansion and breaking parameter setting still need further research and verification. There are problems of complex equipment use and increased costs. Summary of the Invention

[0005] The present application provides a method for designing an engine, an engine block and a tile cover positioning arc surface and a vehicle, which can solve the problems in the prior art of implementing a positioning ring solution that is complex to process and difficult to ensure stability, the problem of implementing a side positioning method that is complex to process and difficult to ensure applicability, and the problem that a large amount of equipment is required in the expansion and breaking process, which is complex to use and increases costs.

[0006] In a first aspect, an embodiment of the present application provides an engine, comprising:

[0007] The tile cover has first positioning bosses at both ends, and the protruding ends of the first positioning bosses are provided with convex arc surfaces;

[0008] The cylinder body has a second positioning boss on its inner side corresponding to the first positioning boss. The second positioning boss has a concave arc surface corresponding to the convex arc surface. The first positioning boss and the second positioning boss abut against each other to locate the position of the tile cover and the cylinder body.

[0009] In one embodiment, the angle between the centerline direction of the convex arc surface and the length direction of the tile cover is greater than 0° and less than 20°.

[0010] In one embodiment, the two first positioning bosses are symmetrical along the axis of the crankshaft.

[0011] In a second aspect, an embodiment of the present application further provides a method for designing an engine cylinder block and a tile cover positioning cambered surface, which is used to design the above-mentioned engine, comprising the following steps:

[0012] Establishing a geometric relationship between the intersection points of the two ends of the arc surface and the two sides of the second positioning boss, the center of the arc surface, and the central angle of the arc surface;

[0013] Adjust the intersection points of the two ends of the arc surface and the second positioning boss, the center position of the arc surface, and the direction of the arc surface so that the central angle is within the preset central angle range to determine the arc surface;

[0014] Based on the bolt tightening torque, the arc surface strength is checked to determine whether the maximum concentrated stress on the arc surface is less than the set threshold. If not, the intersection of the second positioning boss, the center position of the arc surface and the direction of the arc surface are readjusted until the maximum concentrated stress on the arc surface is less than the set threshold.

[0015] In one embodiment, the geometric relationship between the intersection points of the two ends of the arc surface and the two sides of the second positioning boss, the center of the arc surface, and the central angle of the arc surface is established, including:

[0016] Establish a coordinate system, assume the coordinates of the intersections of the two ends of the arc surface and the two sides of the second positioning boss based on the width of the second positioning boss, and obtain the coordinates of the midpoint of the line connecting the intersections;

[0017] Obtain a geometric expression related to the center of the arc surface and the coordinates of the intersection points between the two ends of the arc surface and the two sides of the second positioning boss according to the coordinates of the intersection points between the two ends of the arc surface and the two sides of the second positioning boss, as well as the coordinates of the midpoint of the intersection line;

[0018] According to the geometric expression of the intersection of the two ends of the arc surface and the two sides of the second positioning boss, as well as the center of the arc surface, a geometric relationship is established between the central angle of the arc surface and the coordinates of the intersection of the two ends of the arc surface and the two sides of the second positioning boss, as well as the geometric expression of the center of the arc surface.

[0019] In one embodiment, assuming that the plane coordinates of the arc center are O1(X1, Y1), and the connecting line is y=k1x+m1, the connecting line passes through A(a, d) and B(b, 0), Conclusion Let the perpendicular line of the connecting line be y=k2x+m2, k1k2=-1, Perpendicular line passes through Arc center coordinates

[0020] Among them, O1 is the center of the arc surface, X1 is the horizontal coordinate of point O1, Y1 is the vertical coordinate of point O1, m1 is the vertical intercept of the connecting line, k1 is the slope of the connecting line, k2 is the slope of the perpendicular line of the connecting line, m2 is the vertical intercept of the perpendicular line of the connecting line, point A and point B are the intersection points of the two ends of the arc surface and the two sides of the second positioning boss respectively, a is the horizontal coordinate of point A, b is the horizontal coordinate of point B, d is the width of the second positioning boss, and point C is the midpoint of the connecting line of the intersection of the two sides.

[0021] In one embodiment, the geometric relationship between the central angle of the arc surface and the coordinates of the intersection points of the two ends of the arc surface with the two sides of the second positioning boss, and the geometric expression of the center of the arc surface is established, including:

[0022] According to the coordinates of the midpoint of the connecting line and the geometric expression of the center of the arc surface, obtain the distance between the midpoint of the connecting line and the center of the arc surface;

[0023] According to the intersection point of one end of the arc surface and the second positioning boss, and the geometric expression of the center point of the arc surface, the distance between the intersection point on one side and the center point of the arc surface is obtained;

[0024] According to the distance between the midpoint of the connecting line and the center of the arc surface, and the distance between the intersection point on one side and the center of the arc surface, the geometric relationship between the intersection points on both ends of the arc surface and the two sides of the second positioning boss, the center of the arc surface and the central angle of the arc surface is obtained.

[0025] In one embodiment, the geometric relationship is:

[0026] Among them, O1 is the center of the arc surface, X1 is the horizontal coordinate of point O1, point A and point B are the intersection points of the two ends of the arc surface and the two sides of the second positioning boss respectively, a is the horizontal coordinate of point A, b is the horizontal coordinate of point B, d is the width of the second positioning boss, point C is the midpoint of the connecting line of the intersection points on both sides, 2θ is the central angle of the arc surface, and θ is half of the central angle of the arc surface.

[0027] In one embodiment, the intersection points of the two ends of the arc surface and the second positioning boss, the center position of the arc surface, and the direction of the arc surface are adjusted so that the central angle is within a preset central angle range. Before determining the arc surface, a secondary assembly roundness test of the tile cover and the cylinder body after processing is performed based on the length of the second positioning boss and the position of the bolt hole on the tile cover to determine the preset central angle range of the arc surface.

[0028] In a third aspect, an embodiment of the present application further provides a vehicle comprising the above-mentioned engine.

[0029] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0030] When manufacturing the engine, a first positioning boss is provided at both ends of the tile cover, and the protruding end of the first positioning boss is provided with a convex arc surface. A second positioning boss corresponding to the first positioning boss is provided on the inner side of the cylinder body, and the second positioning boss is provided with a concave arc surface corresponding to the convex arc surface. The first positioning boss and the second positioning boss are in contact with each other and are used to position the tile cover and the cylinder body. The first positioning boss and the second positioning boss have the same shape. A geometric relationship is established between the intersection points of the two ends of the arc surface and the two sides of the second positioning boss, the center of the arc surface and the central angle of the arc surface. The intersection points of the two ends of the arc surface and the second positioning boss, the center position of the arc surface and the direction of the arc surface are adjusted so that the central angle is within the preset central angle range. The arc surface is determined. Based on the tightening torque of the bolt, the strength of the arc surface is checked to determine whether the maximum concentrated stress on the arc surface is less than the set threshold. If not, the intersection point of the second positioning boss, the center position of the arc surface and the direction of the arc surface are readjusted until the maximum concentrated stress on the arc surface is less than the set threshold. Horizontal positioning is achieved through the one-way centering characteristics of the convex arc surface and the concave arc surface. High stability is ensured through the design of the arc surface. The arc surface is processed by vertical milling or boring, which is easy to manufacture and has low processing difficulty. It can ensure applicability and stability on the basis of simple processing methods, and solves the problems in the existing technology of complex processing and difficulty in ensuring stability in implementing the positioning ring solution, complex processing and difficulty in ensuring applicability in implementing the side positioning method, and the problem that a large amount of equipment is required in the expansion and breaking process, which makes the equipment operation complicated and increases costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 The figure is a schematic top view of the structure of a tile cover in an engine embodiment of the present invention.

[0033] Figure 2 This is a schematic structural diagram of a tile cover in an engine embodiment of the present invention.

[0034] Figure 3 This is a schematic structural diagram of a cylinder block in an engine embodiment of the present invention.

[0035] Figure 4 This is a design schematic diagram of a method for designing positioning cambered surfaces for an engine cylinder block and a tile cover according to the present invention, in which the centerline direction of the convex cambered surface coincides with the length direction of the tile cover.

[0036] Figure 5 This is a design schematic diagram of a method for designing positioning cambered surfaces for an engine cylinder block and a tile cover according to the present invention, in which an angle exists between the centerline direction of the convex cambered surface and the length direction of the tile cover.

[0037] In the figure: 1, tile cover; 11, first positioning boss; 2, cylinder body; 21, second positioning boss. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] The embodiments of the present application provide a method for designing positioning arc surfaces for an engine, an engine block, and a tile cover, and a vehicle, which can solve the problems in the prior art of the positioning ring solution being complex to process and difficult to ensure stability, the side positioning method being complex to process and difficult to ensure applicability, and the expansion and breaking process requiring a large amount of equipment, resulting in complex equipment use and increased costs.

[0040] like Figure 1 、 Figure 2 and Figure 3As shown, on the one hand, the present application provides an engine, which includes a tile cover 1 and a cylinder body 2, wherein a first positioning boss 11 is provided at both ends of the tile cover 1, and the protruding end of the first positioning boss 11 is provided with a convex arc surface; a second positioning boss 21 is provided on the inner side of the cylinder body 2 corresponding to the first positioning boss 11, and the second positioning boss 21 is provided with a concave arc surface corresponding to the convex arc surface, and the first positioning boss 11 and the second positioning boss 21 abut against each other for positioning the positions of the tile cover 1 and the cylinder body 2.

[0041] When manufacturing the engine, a first positioning boss 11 is provided at both ends of the tile cover 1, and the protruding end of the first positioning boss 11 is provided with a convex arc surface. A second positioning boss 21 corresponding to the first positioning boss 11 is provided on the inner side of the cylinder body 2. The second positioning boss 21 is provided with a concave arc surface corresponding to the convex arc surface. The first positioning boss 11 and the second positioning boss 21 abut against each other to locate the position of the tile cover 1 and the cylinder body 2. The first positioning boss 11 and the second positioning boss 21 have the same shape, and the two ends of the arc surface are connected to the second positioning boss. The geometric relationship between the intersection of the two sides of the platform 21, the center of the arc surface and the center angle of the arc surface is adjusted, and the intersection of the two ends of the arc surface with the second positioning boss 21, the position of the center of the arc surface and the direction of the arc surface are adjusted so that the center angle is within the preset center angle range. The arc surface is determined, and the strength of the arc surface is checked based on the bolt tightening torque. It is judged whether the maximum concentrated stress on the arc surface is less than the set threshold. If not, the intersection of the second positioning boss 21, the position of the center of the arc surface and the direction of the arc surface are readjusted until the maximum concentrated stress on the arc surface is less than the set threshold. Horizontal positioning is achieved through the one-way centering characteristics of the convex arc surface and the concave arc surface. The design of the arc surface ensures high stability. The arc surface adopts vertical milling or boring, which is easy to manufacture and has low processing difficulty. It can ensure applicability and stability on the basis of simple processing methods. It solves the problems of the existing technology that the positioning ring solution is complex in processing and difficult to ensure stability, the side positioning method is complex in processing and difficult to ensure applicability, and the expansion and breaking process requires a large amount of equipment, which is complicated in equipment use and increases costs.

[0042] In some optional embodiments, the angle between the centerline direction of the convex arc surface and the length direction of the tile cover 1 is greater than 0° and less than 20°.

[0043] In this embodiment, the angle between the centerline direction of the convex arc surface and the length direction of the tile cover 1 is set to be greater than 0° and less than 20°. Compared with the solution in which the centerline direction coincides with the length direction of the tile cover 1, a thrust can be applied to the tile cover 1 during assembly, thereby improving positioning accuracy.

[0044] In some optional embodiments, the two first positioning bosses 11 are symmetrical along the axis of the crankshaft.

[0045] In this embodiment, the shoe cover 1 and the cylinder block 2 are used to cooperate in installing the crankshaft. The two first positioning bosses 11 are symmetrical along the axis of the crankshaft, which can improve the positioning accuracy while preventing wrong installation and facilitate installation.

[0046] In this example, when the arc surface opens in a direction away from the operator, tighten the bolts on the left first and then tighten the bolts on the right. When the arc surface opens in a direction close to the operator, tighten the bolts on the right first and then tighten the bolts on the left.

[0047] like Figure 4 and Figure 5 As shown, on the one hand, the present application also provides a method for designing an engine cylinder block and a tile cover positioning cambered surface, which is used to design the above-mentioned engine, comprising the following steps:

[0048] S1: Establishing a geometric relationship between the intersection points of the two ends of the arc surface and the two sides of the second positioning boss 21, the center of the arc surface, and the central angle of the arc surface.

[0049] In some optional embodiments, step S1 specifically includes:

[0050] S11: Establish a coordinate system, assume the coordinates of the intersections between the two ends of the arc surface and the two sides of the second positioning boss 21 according to the width of the second positioning boss 21, and obtain the coordinates of the midpoint of the intersection connection line.

[0051] In this example, step S11 specifically includes: assuming that the coordinates of the intersections of the two ends of the arc surface and the two sides of the second positioning boss 21 are A (a, d) and B (b, 0), the coordinates of point C are Among them, point A and point B are the intersection points of the two ends of the arc surface and the two sides of the second positioning boss 21 respectively, a is the horizontal coordinate of point A, b is the horizontal coordinate of point B, d is the width of the second positioning boss 21, and point C is the midpoint of the connecting line of the two intersection points.

[0052] S12: According to the coordinates of the intersection points between the two ends of the arc surface and the two sides of the second positioning boss 21 and the coordinates of the midpoint of the intersection line, obtain a geometric expression related to the center of the arc surface and the coordinates of the intersection points between the two ends of the arc surface and the two sides of the second positioning boss 21.

[0053] In this example, step S12 specifically includes: assuming that the plane coordinates of the arc center are O1(x1, Y1), setting the connecting line to be y=k1x+m1, and the connecting line passes through A(a, d) and B(b, 0), Conclusion Let the perpendicular line of the connecting line be y=k2x+m2, k1k2=-1, Perpendicular line passes through Arc center coordinates Among them, O1 is the center of the arc surface, X1 is the horizontal coordinate of point O1, Y1 is the vertical coordinate of point O1, m1 is the vertical intercept of the connecting line, k1 is the slope of the connecting line, k2 is the slope of the perpendicular line of the connecting line, m2 is the vertical intercept of the perpendicular line of the connecting line, point A and point B are the intersection points of the two ends of the arc surface and the two sides of the second positioning boss 21 respectively, a is the horizontal coordinate of point A, b is the horizontal coordinate of point B, d is the width of the second positioning boss 21, and point C is the midpoint of the connecting line of the intersection of the two sides.

[0054] S13: According to the geometric expression of the intersection of the two ends of the arc surface and the two sides of the second positioning boss 21, and the center of the arc surface, a geometric relationship between the central angle of the arc surface and the coordinates of the intersection of the two ends of the arc surface and the two sides of the second positioning boss 21, and the geometric expression of the center of the arc surface is established.

[0055] In some optional embodiments, step S13 specifically includes:

[0056] S131: Obtain the distance between the midpoint of the connecting line and the center of the arc surface according to the coordinates of the midpoint of the connecting line and the geometric expression of the center of the arc surface.

[0057] S132: According to the intersection of one end of the arc surface and the second positioning boss 21 and the geometric expression of the center of the arc surface, obtain the distance between the intersection on one side and the center of the arc surface.

[0058] S133: According to the distance between the midpoint of the connecting line and the center of the arc surface, and the distance between the intersection point on one side and the center of the arc surface, obtain the geometric relationship between the intersection points on both sides of the arc surface and the second positioning boss 21, the center of the arc surface and the central angle of the arc surface.

[0059] In this example, the geometric relationship is: Among them, O1 is the center of the arc surface, C1 is the horizontal coordinate of point O1, point A and point B are the intersection points of the two ends of the arc surface and the two sides of the second positioning boss 21 respectively, a is the horizontal coordinate of point A, b is the horizontal coordinate of point B, d is the width of the second positioning boss 21, point C is the midpoint of the connecting line of the intersection points on both sides, 2θ is the central angle of the arc surface, and θ is half of the central angle of the arc surface.

[0060] in,

[0061] S2: Adjust the intersection points of the two ends of the arc surface and the second positioning boss 21, the center position of the arc surface, and the direction of the arc surface so that the central angle is within the preset central angle range to determine the arc surface.

[0062] In some optional embodiments, the intersection points of the two ends of the arc surface and the second positioning boss 21, the position of the center of the arc surface, and the orientation of the arc surface are adjusted so that the central angle is within a preset central angle range. Before determining the arc surface, a secondary assembly roundness test of the tile cover 1 and the cylinder body 2 after processing is performed based on the length of the second positioning boss 21 and the position of the bolt hole on the tile cover 1 to determine the preset central angle range of the arc surface.

[0063] In this example, when the axis of the bolt hole on the tile cover 1 coincides with the center of the arc surface, the tile cover 1 and the cylinder body 2 are finely processed and then subjected to a secondary assembly roundness test. To ensure that the concave arc surface of the second positioning boss 21 satisfies the intersection point located on both sides of the second positioning boss 21, the maximum area of ​​vertical milling or boring is a semicircle, and the preset central angle range of the arc surface is 48° to 180°.

[0064] S3: Based on the bolt tightening torque, check the arc surface strength to determine whether the maximum concentrated stress on the arc surface is less than the set threshold. If not, readjust the intersection of the second positioning boss 21, the center position of the arc surface and the direction of the arc surface until the maximum concentrated stress on the arc surface is less than the set threshold.

[0065] In summary, when manufacturing the engine, a first positioning boss 11 is provided at both ends of the tile cover 1, and the protruding end of the first positioning boss 11 is provided with a convex arc surface. A second positioning boss 21 corresponding to the first positioning boss 11 is provided on the inner side of the cylinder body 2, and the second positioning boss 21 is provided with a concave arc surface corresponding to the convex arc surface. The first positioning boss 11 and the second positioning boss 21 abut against each other to locate the position of the tile cover 1 and the cylinder body 2. The first positioning boss 11 and the second positioning boss 21 have the same shape, and the arc surface at both ends is connected to the second positioning boss 21. The geometric relationship between the intersection of the two sides of the boss 21, the center of the arc surface and the center angle of the arc surface is adjusted, and the intersection of the two ends of the arc surface with the second positioning boss 21, the position of the center of the arc surface and the direction of the arc surface are adjusted so that the center angle is within the preset center angle range. The arc surface is determined, and the strength of the arc surface is checked based on the bolt tightening torque. It is judged whether the maximum concentrated stress on the arc surface is less than the set threshold. If not, the intersection of the second positioning boss 21, the position of the center of the arc surface and the direction of the arc surface are readjusted until the maximum concentrated stress on the arc surface is less than the set threshold. Horizontal positioning is achieved through the self-unidirectional centering characteristics of the convex arc surface and the concave arc surface. The design of the arc surface ensures high stability. The arc surface adopts vertical milling or boring, which is easy to manufacture and has low processing difficulty. It can ensure applicability and stability on the basis of simple processing methods. It solves the problems of the existing technology that the positioning ring solution is complex in processing and difficult to ensure stability, the side positioning method is complex in processing and difficult to ensure applicability, and the expansion and breaking process requires a large amount of equipment, which is complicated in equipment use and increases costs.

[0066] like Figure 1 、 Figure 2 and Figure 3 As shown, on the other hand, the present application also provides a vehicle, which includes the above-mentioned engine.

[0067] When manufacturing the engine, a first positioning boss 11 is provided at both ends of the tile cover 1, and the protruding end of the first positioning boss 11 is provided with a convex arc surface. A second positioning boss 21 corresponding to the first positioning boss 11 is provided on the inner side of the cylinder body 2. The second positioning boss 21 is provided with a concave arc surface corresponding to the convex arc surface. The first positioning boss 11 and the second positioning boss 21 abut against each other to locate the position of the tile cover 1 and the cylinder body 2. The first positioning boss 11 and the second positioning boss 21 have the same shape, and the two ends of the arc surface are connected to the second positioning boss. The geometric relationship between the intersection of the two sides of the platform 21, the center of the arc surface and the center angle of the arc surface is adjusted, and the intersection of the two ends of the arc surface with the second positioning boss 21, the position of the center of the arc surface and the direction of the arc surface are adjusted so that the center angle is within the preset center angle range. The arc surface is determined, and the strength of the arc surface is checked based on the bolt tightening torque. It is judged whether the maximum concentrated stress on the arc surface is less than the set threshold. If not, the intersection of the second positioning boss 21, the position of the center of the arc surface and the direction of the arc surface are readjusted until the maximum concentrated stress on the arc surface is less than the set threshold. Horizontal positioning is achieved through the one-way centering characteristics of the convex arc surface and the concave arc surface. The design of the arc surface ensures high stability. The arc surface adopts vertical milling or boring, which is easy to manufacture and has low processing difficulty. It can ensure applicability and stability on the basis of simple processing methods. It solves the problems of the existing technology that the positioning ring solution is complex in processing and difficult to ensure stability, the side positioning method is complex in processing and difficult to ensure applicability, and the expansion and breaking process requires a large amount of equipment, which is complicated in equipment use and increases costs.

[0068] In summary, this solution sets the ends of the first positioning boss 11 and the second positioning boss 21 on the tile cover 1 and the cylinder body 2 as arc surfaces. By designing the arc surfaces, while ensuring simple processing and improving processing speed, the applicability and stability of the first positioning boss 11 and the second positioning boss 21 are guaranteed by the characteristics of the arc surfaces themselves. This solves the problem that when implementing the positioning ring solution in the existing technology, each tile cover requires two positioning rings for positioning. A 6-cylinder diesel engine needs to process 28 pin holes and 14 positioning rings, which has high processing costs and complex assembly processes. In addition, due to the increase in assembly surfaces, the positioning accuracy and stability are poor, and there are problems of complex processing and difficulty in ensuring stability. When the side positioning method is implemented, stress is concentrated at the corners of the positioning table, and the cylinder body is prone to cracking along this area. The undercut groove can avoid stress concentration, but the processing process is complicated. In addition, the side positioning cannot be axially positioned, and it is difficult to use it on the thrust bearing seat. There are problems of complex processing and difficulty in ensuring applicability. The expansion and breaking process requires a large amount of equipment, and the laser etching and expansion and breaking parameter setting still need further research and verification, which has the problems of complex equipment use and increased costs. The implementation effect is good.

[0069] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0070] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0071] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. An engine, characterized in that: include: The tile cover (1) is provided with a first positioning boss (11) at both ends, and the protruding end of the first positioning boss (11) is provided with a convex arc surface; The cylinder body (2) has a second positioning boss (21) provided on its inner side corresponding to the first positioning boss (11), the second positioning boss (21) having a concave arc surface corresponding to the convex arc surface, the first positioning boss (11) and the second positioning boss (21) abutting against each other to locate the positions of the tile cover (1) and the cylinder body (2); When designing the convex arc surface: establishing a geometric relationship between the intersection points of the two ends of the arc surface and the two sides of the second positioning boss (21), the center of the arc surface and the center angle of the arc surface; Adjust the intersection points of the two ends of the arc surface and the second positioning boss (21), the center position of the arc surface, and the direction of the arc surface so that the center angle is within the preset center angle range, and determine the arc surface; Based on the bolt tightening torque, the arc surface strength is checked to determine whether the maximum concentrated stress on the arc surface is less than a set threshold value. If not, the intersection point of the second positioning boss (21), the center position of the arc surface and the direction of the arc surface are readjusted until the maximum concentrated stress on the arc surface is less than the set threshold value.

2. An engine according to claim 1, characterized in that: The angle between the centerline direction of the convex arc surface and the length direction of the tile cover (1) is greater than 0° and less than 20°.

3. An engine as claimed in claim 2, characterized in that: The two first positioning bosses (11) are symmetrical along the axial direction of the crankshaft.

4. A method for designing positioning cambered surfaces of an engine cylinder block and a tile cover, characterized in that: Designing an engine according to any one of claims 1 to 3, comprising the following steps: Establishing a geometric relationship between the intersection points of the two ends of the arc surface and the two sides of the second positioning boss (21), the center of the arc surface and the center angle of the arc surface; Adjust the intersection points of the two ends of the arc surface and the second positioning boss (21), the center position of the arc surface, and the direction of the arc surface so that the center angle is within the preset center angle range, and determine the arc surface; Based on the bolt tightening torque, the arc surface strength is checked to determine whether the maximum concentrated stress on the arc surface is less than a set threshold value. If not, the intersection point of the second positioning boss (21), the center position of the arc surface and the direction of the arc surface are readjusted until the maximum concentrated stress on the arc surface is less than the set threshold value.

5. The method for designing positioning cambered surfaces of an engine cylinder block and a tile cover according to claim 4, wherein: The geometric relationship between the intersection points of the two ends of the arc surface and the two sides of the second positioning boss (21), the center of the arc surface and the central angle of the arc surface includes: Establish a coordinate system, assume the coordinates of the intersections between the two ends of the arc surface and the two sides of the second positioning boss (21) based on the width of the second positioning boss (21), and obtain the coordinates of the midpoint of the intersection connection line; Obtaining a geometric expression related to the center of the arc surface and the coordinates of the intersection points between the two ends of the arc surface and the two sides of the second positioning boss (21) based on the coordinates of the intersection points between the two ends of the arc surface and the two sides of the second positioning boss (21), and the coordinates of the midpoint of the intersection connection line; According to the intersection points of the two ends of the arc surface and the two sides of the second positioning boss (21), and the geometric expression of the center of the arc surface, a geometric relationship between the central angle of the arc surface and the coordinates of the intersection points of the two ends of the arc surface and the two sides of the second positioning boss (21), and the geometric expression of the center of the arc surface is established.

6. A method for designing positioning cambered surfaces of an engine cylinder block and a tile cover as claimed in claim 5, characterized in that: Assume that the plane coordinates of the arc center are , let the connecting line be , the connecting line passes through and , , we can conclude , let the perpendicular line of the connecting line be , , , the perpendicular line passes through C , , the coordinates of the arc center ; in, is the center of the arc, for The horizontal coordinate of the point, for The vertical coordinate of the point, is the vertical intercept of the connecting line, is the slope of the connecting line, is the slope of the perpendicular line connecting the lines, is the vertical intercept of the perpendicular line connecting the lines, Point and The points are the intersection points of the two ends of the arc surface and the two sides of the second positioning boss (21). for The horizontal coordinate of the point, for The horizontal coordinate of the point, is the width of the second positioning boss (21), and point C is the midpoint of the connecting line of the intersection points on both sides.

7. The method for designing positioning cambered surfaces of an engine cylinder block and a tile cover according to claim 5, wherein: The geometric relationship between the central angle of the arc surface and the coordinates of the intersection points of the two ends of the arc surface with the two sides of the second positioning boss (21), and the geometric expression of the center of the arc surface is established, including: According to the coordinates of the midpoint of the connecting line and the geometric expression of the center of the arc surface, obtain the distance between the midpoint of the connecting line and the center of the arc surface; According to the intersection point of one end of the arc surface and the second positioning boss (21), and the geometric expression of the center point of the arc surface, the distance between the intersection point on one side and the center point of the arc surface is obtained; According to the distance between the midpoint of the connecting line and the center of the arc surface, and the distance between the intersection point on one side and the center of the arc surface, a geometric relationship between the intersection points on both sides of the arc surface and the second positioning boss (21), the center of the arc surface and the center angle of the arc surface is obtained.

8. The method for designing positioning cambered surfaces of an engine cylinder block and a tile cover according to claim 7, wherein: The geometric relationship is: ; in, is the center of the arc, for The horizontal coordinate of the point, Point and The points are the intersection points of the two ends of the arc surface and the two sides of the second positioning boss (21). for The horizontal coordinate of the point, for The horizontal coordinate of the point, is the width of the second positioning boss (21), point C is the midpoint of the connecting line of the intersection points on both sides, is the central angle of the arc surface, It is half of the central angle of the arc.

9. The method for designing positioning cambered surfaces of an engine cylinder block and a tile cover according to claim 4, wherein: The intersection points of the two ends of the arc surface and the second positioning boss (21), the center position of the arc surface and the direction of the arc surface are adjusted so that the center angle is within the preset center angle range. Before determining the arc surface, a secondary assembly roundness test of the tile cover (1) and the cylinder body (2) after processing is performed based on the length of the second positioning boss (21) and the position of the bolt hole on the tile cover (1) to determine the preset center angle range of the arc surface.

10. A vehicle, characterized in that: The invention comprises an engine as claimed in any one of claims 1 to 3.

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