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

Abstract

The invention relates to an engine, an engine cylinder block and tile cover positioning cambered surface design method and a vehicle, and relates to the technical field of automobile part assembly structures, the engine comprises a tile cover, first positioning bosses are arranged at the two ends of the tile cover, and convex cambered surfaces are arranged at the extending ends of the first positioning bosses; the inner side of the cylinder body is provided with a second positioning boss corresponding to the first positioning boss, the second positioning boss is provided with a concave arc face corresponding to the convex arc face, and the first positioning boss and the second positioning boss abut against each other and are used for positioning the tile cover and the cylinder body. Horizontal positioning is achieved through the one-way centering characteristic of the convex cambered surface and the concave cambered surface, high stability is guaranteed through the design of the arc surface, the arc surface is subjected to vertical milling or boring, machining difficulty is low, manufacturing is easy, applicability and stability can be guaranteed on the basis that the machining mode is simple, and machining efficiency is improved. The problem that in the prior art, it is difficult for three schemes to guarantee the simple machining mode, applicability and stability at the same time is solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts assembly structure, 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 the engine, the crankshaft hole plays the role of supporting the crankshaft connecting rod mechanism. During the operation of the engine, 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 is required to be high enough to improve its fatigue resistance. The use of a crankshaft hole with a cap can improve its load-bearing capacity and shear resistance, and greatly improve the assembly quality and positioning accuracy. At present, the assembly process of the crankshaft hole mechanism is to first fix the cap and cylinder block by certain means, then process the crankshaft hole, then remove the cap to install the bearing and crankshaft, and finally reinstall the cap and cylinder block. The accuracy of the crankshaft hole is required to reach 0.008mm, and it is required to have the ability to restore accuracy after reinstallation. Therefore, the positioning requirements of the cap and cylinder block are stronger than other parts.

[0003] In the existing technology, there are three main positioning solutions for the cylinder head and the cylinder block. One is to position through a positioning ring, which is essentially a traditional "one side, two pins" technology. One is to use side positioning, which is performed through a positioning table or a countersunk 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 bearing cover requires two locating rings to achieve 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 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 countersunk groove can avoid stress concentration, but the processing technology is complicated. In addition, the 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, and 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 that the positioning ring solution is complicated to process and difficult to ensure stability, the side positioning method is complicated to process and difficult to ensure applicability, and the expansion and breaking process requires a large amount of equipment, which makes the equipment operation complicated 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 center line 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 axial direction of the crankshaft.

[0011] In a second aspect, the present application also provides a method for designing an engine cylinder block and a cambered surface for positioning a bearing cap, which is used to design the above-mentioned engine and includes 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 center 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 center angle is within the preset center angle range, and 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 center angle of the arc surface includes:

[0016] 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 according to the width of the second positioning boss, and obtain the coordinates of the midpoint of the intersection connection line;

[0017] 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, and the coordinates of the midpoint of the intersection connection line, obtain the 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;

[0018] According to the geometric expression of the intersection points of the two ends of the arc surface and the two sides of the second positioning boss, and 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, and the geometric expression of the center of the arc surface is established.

[0019] In one implementation, assuming that the plane coordinates of the arc center are O1 (X1, Y1), and assuming that the connecting line is y=k1x+m1, the connecting line passes through A (a, d) and B (b, 0), Conclusion Assume the perpendicular line of the connecting line is y=k2x+m2, k1k2=-1, Vertical 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 and 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 sides of the arc surface and 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 position of the center of the arc surface, and the direction of the arc surface are adjusted so that the center angle is within a preset center 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 center angle range of the arc surface.

[0028] In a third aspect, an embodiment of the present application further provides a vehicle, which includes an engine as described above.

[0029] The beneficial effects brought by the technical solution 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 a convex arc surface is provided at the protruding end of the first positioning boss. 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 locate the position of the tile cover and the cylinder body. The first positioning boss and the second positioning boss have the same shape. 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 center angle of the arc surface is established, and 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 center angle is within a preset center angle range, and 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 a 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 machined by vertical milling or boring, which has low processing difficulty and is easy to manufacture. Applicability and stability can be guaranteed on the basis of simple processing methods, which solves the problems in the prior art of implementing the positioning ring solution, which has the problem of complex processing and difficulty in ensuring stability, the problem of 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 has the problem of complex equipment operation and increased costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 creative work.

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

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

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

[0035] Figure 4 It is a design schematic diagram of a method for designing positioning cambered surfaces of 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 It is a design schematic diagram of an engine cylinder block and tile cover positioning arc surface design method of the present invention, in which the center line direction of the convex arc surface and the length direction of the tile cover have an angle.

[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 solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below 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 creative work are within the scope of protection of this application.

[0039] The embodiments of the present application provide 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 that the implementation of the positioning ring solution is complicated in processing and it is difficult to ensure stability, the implementation of the side positioning method is complicated in processing and it is difficult to ensure applicability, and the expansion and breaking process requires a large amount of equipment, which leads to complex equipment operation 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 block 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 corresponding to the first positioning boss 11 is provided on the inner side of the cylinder block 2, 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 tile cover 1 and the cylinder block 2.

[0041] When manufacturing the engine, a first positioning boss 11 is provided at both ends of the tile cover 1, and a convex arc surface is provided at the protruding end of the first positioning boss 11. 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 positions 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 points on both sides of the platform 21, the center of the arc surface and the center angle of the arc surface is adjusted to adjust the intersection points 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 so that the center angle is within the preset center angle range, determine the arc surface, check the arc surface strength based on the bolt tightening torque, and judge whether the maximum concentrated stress on the arc surface is less than the set threshold. If not, readjust the intersection points of the second positioning boss 21, the position of the center 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. 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, and the arc surface adopts vertical milling or boring, which has low processing difficulty and is easy to manufacture. It can ensure applicability and stability on the basis of simple processing methods, and solves the problems of complex processing and difficulty in ensuring stability in the implementation of the positioning ring solution in the prior art, complex processing and difficulty in ensuring applicability in the implementation of the side positioning method, 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 center line 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 center line 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 center line direction coincides with the length direction of the tile cover 1, a thrust can be applied to the tile cover 1 during assembly to improve the positioning accuracy.

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

[0045] In this embodiment, the bearing cap 1 and the cylinder block 2 are used to cooperate in installing the crankshaft, and the two first positioning bosses 11 are symmetrical along the axial direction of the crankshaft, which can improve the positioning accuracy and prevent wrong installation, thereby facilitating 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 cambered surface for positioning a bearing cap, which is used to design the above-mentioned engine, and comprises 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 center angle of the arc surface.

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

[0050] S11: Establishing a coordinate system, assuming 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 obtaining 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 intersections 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, obtain a geometric expression related to the center of the arc surface and the coordinates of the intersections 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 Assume the perpendicular line of the connecting line is y=k2x+m2, k1k2=-1, Vertical 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 expressions of the intersections of the two ends of the arc surface with 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 intersections of the two ends of the arc surface with the two sides of the second positioning boss 21 and 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 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.

[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 center 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: adjusting 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 a preset center angle range, thereby determining the arc surface.

[0062] In some optional embodiments, the intersection points 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 a 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.

[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 secondary assembly roundness test is performed after the tile cover 1 and the cylinder body 2 are finely processed. 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 ​​the vertical milling or boring is a semicircle, and the preset center 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 arc surface center position and the arc surface orientation 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 a convex arc surface is provided at the protruding end of the first positioning boss 11. 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 positions 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 with 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 to adjust 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 so that the center angle is within the preset center angle range, determine the arc surface, check the arc surface strength based on the bolt tightening torque, and judge 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 position of the center 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. 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, and the arc surface adopts vertical milling or boring, which is easy to manufacture. The applicability and stability can be guaranteed on the basis of simple processing methods, which solves the problems of complex processing and difficulty in ensuring stability in the implementation of the positioning ring solution in the prior art, the problem of complex processing and difficulty in ensuring applicability in the implementation of the side positioning method, and the problem that a large amount of equipment is required for the expansion and breaking process, and the equipment is complicated to use and the cost is increased.

[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 a convex arc surface is provided at the protruding end of the first positioning boss 11. 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 positions 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 points on both sides of the platform 21, the center of the arc surface and the center angle of the arc surface is adjusted to adjust the intersection points 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 so that the center angle is within the preset center angle range, determine the arc surface, check the arc surface strength based on the bolt tightening torque, and judge whether the maximum concentrated stress on the arc surface is less than the set threshold. If not, readjust the intersection points of the second positioning boss 21, the position of the center 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. 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, and the arc surface adopts vertical milling or boring, which has low processing difficulty and is easy to manufacture. It can ensure applicability and stability on the basis of simple processing methods, and solves the problems of complex processing and difficulty in ensuring stability in the implementation of the positioning ring solution in the prior art, complex processing and difficulty in ensuring applicability in the implementation of the side positioning method, 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, designs the arc surfaces, ensures the applicability and stability of the first positioning boss 11 and the second positioning boss 21 through the characteristics of the arc surfaces themselves, while ensuring the simplicity of processing and improving the processing speed. This solves the problem that when the positioning ring solution is implemented in the prior art, each tile cover requires two positioning rings to achieve positioning, and 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 corner of the positioning table, and the cylinder body is prone to cracking along this place, while 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, and 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, and there are problems of complex equipment use and increased costs. The implementation effect is good.

[0069] In the description of the present application, it should be noted that the terms "upper", "lower", etc. 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 the present application and simplifying the description, rather than indicating or implying 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 the present 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present 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 only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such 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 including 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, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0071] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An engine, characterized in that: include: The tile cover (1) has first positioning bosses (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) on its inner side which is arranged corresponding to the first positioning boss (11); the second positioning boss (21) has 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 positions of the tile cover (1) and the cylinder body (2).

2. An engine as claimed in claim 1, characterized in that: The angle between the center line 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 bearing cover, characterized in that: For designing an engine as claimed in 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 between 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 a preset center angle range, thereby determining 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 arc surface center position and the arc surface direction are readjusted until the maximum concentrated stress on the arc surface is less than the set threshold value.

5. A method for designing positioning cambered surfaces of an engine cylinder block and a bearing cover as claimed in claim 4, characterized in that: 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 center angle of the arc surface includes: Establishing a coordinate system, assuming 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 obtaining the coordinates of the midpoint of the intersection connection line; 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 connection line, 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) is obtained; 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 center 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 bearing cap as claimed in claim 5, characterized in that: Assume that the plane coordinates of the arc center are O1(X1, Y1), and the connecting line is y=k1x+m1, which passes through A(a, d) and B(b, 0). Conclusion Assume the perpendicular line of the connecting line is y=k2x+m2, k1k2=-1, Vertical 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), 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 points on both sides.

7. A method for designing positioning cambered surfaces of an engine cylinder block and a bearing cap as claimed in claim 5, characterized in that: 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. A method for designing positioning cambered surfaces of an engine cylinder block and a bearing cap as claimed in claim 7, characterized in that: The geometric relationship is: 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 (21), 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 two intersection points, 2θ is the center angle of the arc surface, and θ is half of the center angle of the arc surface.

9. A method for designing positioning cambered surfaces of an engine cylinder block and a bearing cover as claimed in claim 4, characterized in that: 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 direction of the arc surface are adjusted so that the center angle is within a 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: Comprising an engine as described in any one of claims 1-3.

Images