Oblique notch connecting rod

Abstract

The invention belongs to the technical field of engines, and particularly relates to an oblique notch connecting rod. The upper bush first thinning area is arranged outside the connecting rod big end, the upper bush second thinning area is arranged inside the connecting rod big end, an acute included angle alpha is formed between a bush opening of the upper bush and the end face of the connecting rod big end, and intervals are formed between the upper bush first thinning area and the edge of the heavy load area and between the upper bush second thinning area and the edge of the heavy load area respectively; the first lower tile thinning area is arranged inside the connecting rod cover, the second lower tile thinning area is arranged outside the connecting rod cover, and an acute included angle alpha is formed between a tile opening of the lower tile and the cover surface of the connecting rod cover; and an acute included angle alpha is formed between the tile opening pressing combination surface of the upper tile and the connecting rod splitting surface as well as between the tile opening pressing combination surface of the lower tile and the connecting rod splitting surface. Due to the fact that the upper bush first thinning area is arranged outside the connecting rod big end, and the intervals are arranged between the upper bush first thinning area and the edge of the heavy load area and between the upper bush second thinning area and the edge of the heavy load area respectively, the problem that a connecting rod bearing bush thinning area of an existing oblique notch connecting rod is prone to causing overload of a connecting rod bearing bush is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and more specifically, to an inclined cut connecting rod. Background Art

[0002] At present, diesel engines are widely used in fields such as ships, transportation, and power generation due to their advantages of a large power range, high fuel efficiency, and convenient maintenance. As the average effective pressure and explosion pressure of diesel engines continue to increase, the load on the connecting rod bearings also becomes greater and greater. Among them, the connecting rod is one of the key components of a diesel engine, and its function is to convert the reciprocating motion of the piston into the rotational motion of the crankshaft and transmit the gas explosion pressure received by the piston to the crankshaft. The connecting rod mainly includes a connecting rod body, a connecting rod small end and a connecting rod big end respectively provided at both ends of the connecting rod body, and a connecting rod cap for covering the connecting rod big end. A crankshaft mounting hole sleeved on the crankshaft journal is formed between the connecting rod cap and the connecting rod big end, and a connecting rod bearing is installed on the inner circumferential side of the crankshaft mounting hole. Among them, the hole wall part of the crankshaft mounting hole corresponding to the side of the connecting rod small end is a heavy load area.

[0003] For an inclined cut connecting rod, thinning areas are respectively provided on the inner side surfaces on both sides of the mouth of the upper bearing shell and the lower bearing shell to eliminate the compensation for the extrusion deformation of the mouth pressing joint surface of the upper bearing shell and the lower bearing shell into the bearing hole after interference pressing, and prevent the deformation amount from squeezing the crankshaft and causing the connecting rod bearing to be overloaded. Since the center line of the connecting rod split surface of the inclined cut connecting rod coincides with the mouth pressing joint surface of the upper bearing shell and the lower bearing shell, correspondingly, the thinning area of the upper bearing shell and the thinning area of the lower bearing shell are respectively located on both sides of the center line of the connecting rod split surface.

[0004] With the development of technology, the average effective pressure and explosion pressure of diesel engines continue to increase, and the crankshaft journal and the big end of the connecting rod also continue to increase. To meet the need for cylinder overhaul, the angle of the connecting rod split surface of the inclined cut connecting rod is increased. Since the center line of the connecting rod split surface of the inclined cut connecting rod coincides with the mouth pressing joint surface of the upper bearing shell and the lower bearing shell, an overlapping area appears between the thinning area and the heavy load area, forming a heavy load weakening area. As the angle of the connecting rod split surface increases, the angular range of the corresponding heavy load weakening area also continuously increases, resulting in an increasing load on the connecting rod bearing, exceeding the allowable bearing pressure of the connecting rod bearing. The existing bearing arrangement structure of the inclined cut connecting rod can no longer meet the use requirements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an inclined cut connecting rod, aiming to solve the problem that the thinning area of the connecting rod bearing of the existing inclined cut connecting rod easily causes the connecting rod bearing to be overloaded, and can improve the reliability of the connecting rod bearing.

[0006] The present invention discloses an inclined-cut connecting rod, which includes a connecting rod body, a connecting rod small end and a connecting rod big end respectively arranged at two ends of the connecting rod body, a connecting rod cap for fastening to the connecting rod big end, and a fastener for fixedly connecting the connecting rod cap and the connecting rod big end. A crankshaft mounting hole is formed between the connecting rod cap and the connecting rod big end, and the obtuse angle θ range on the side corresponding to the connecting rod small end of the crankshaft mounting hole is a heavy-load area. It is characterized in that it further includes an upper bearing shell arranged on the connecting rod big end. On the inner sides of both sides of the bearing shell opening of the upper bearing shell, there are respectively an upper bearing shell first thinning area and an upper bearing shell second thinning area. The upper bearing shell first thinning area corresponding to the side where the connecting rod big end is close to the connecting rod body is arranged outside the connecting rod big end, and the upper bearing shell second thinning area corresponding to the side where the connecting rod big end is far from the connecting rod body is arranged inside the connecting rod big end. An acute angle α is provided between the bearing shell opening of the upper bearing shell and the end face of the connecting rod big end. There are intervals respectively between the upper bearing shell first thinning area, the upper bearing shell second thinning area and the edge of the heavy-load area. A lower bearing shell is arranged on the connecting rod cap. On the inner sides of both sides of the bearing shell opening of the lower bearing shell, there are respectively a lower bearing shell first thinning area and a lower bearing shell second thinning area. The lower bearing shell first thinning area corresponding to the side where the connecting rod big end is close to the connecting rod body is arranged inside the connecting rod cap, and the lower bearing shell second thinning area corresponding to the side where the connecting rod big end is far from the connecting rod body is arranged outside the connecting rod cap. An acute angle α is provided between the bearing shell opening of the lower bearing shell and the cover surface of the connecting rod cap. The connecting rod cap is fastened to the connecting rod big end, and an acute angle α is provided between the bearing shell opening pressing joint surface of the upper bearing shell, the bearing shell opening pressing joint surface of the lower bearing shell and the connecting rod split surface.

[0007] As an improvement, the acute angle α is greater than or equal to 50 degrees and less than or equal to 60 degrees, and the obtuse angle θ is greater than or equal to 100 degrees and less than or equal to 120 degrees; the central angles corresponding to the lower bearing shell first thinning area and the lower bearing shell second thinning area are acute angles β, and the acute angle β is greater than or equal to 17.5 degrees and less than or equal to 22.5 degrees.

[0008] As an improvement, a big end first oil groove is arranged on the inner side surface of the side where the connecting rod big end is close to the connecting rod body, and a big end second oil groove is arranged on the inner side surface of the side where the connecting rod big end is far from the connecting rod body. The first oil groove and the big end second oil groove are arranged along the circumferential direction of the inner side surface of the connecting rod big end and respectively extend to the fastening surfaces on the corresponding sides between the connecting rod big end and the connecting rod cap; a cover body oil groove is arranged on the inner side surface of the connecting rod cap. The cover body oil groove is arranged along the circumferential direction of the inner side surface of the connecting rod cap, and both ends of the cover body oil groove respectively extend to the fastening surfaces on the corresponding sides between the connecting rod cap and the connecting rod big end; the connecting rod cap is fastened to the connecting rod big end, and both ends of the cover body oil groove are respectively communicated with the big end first oil groove and the big end second oil groove.

[0009] As an improvement, a first oil groove of the upper bearing shell is provided on the inner side surface of the upper bearing shell corresponding to one side of the first thinning area of the upper bearing shell, and a second oil groove of the upper bearing shell is provided on the inner side surface of the upper bearing shell corresponding to one side of the second thinning area of the upper bearing shell. The first oil groove of the upper bearing shell and the second oil groove of the upper bearing shell are arranged along the circumferential direction of the upper bearing shell and respectively extend to the side edges of the bearing shell opening; a first oil outlet hole is provided between the first oil groove of the upper bearing shell and the cover body oil groove, and the first oil outlet hole is arranged at the end of the first oil groove of the upper bearing shell away from the fastening surface between the big end of the connecting rod and the connecting rod cover; a second oil outlet hole is provided between the second oil groove of the upper bearing shell and the second oil groove of the big end, and the second oil outlet hole is arranged at the end of the second oil groove of the upper bearing shell away from the fastening surface between the big end of the connecting rod and the connecting rod cover.

[0010] As an improvement, the ends of the second oil groove of the upper bearing shell and the second oil groove of the big end away from the fastening surface between the big end of the connecting rod and the connecting rod cover extend to the heavy load area. At least two third oil outlet holes are further provided between the second oil groove of the upper bearing shell and the second oil groove of the big end. The at least two third oil outlet holes are arranged at intervals along the circumferential direction of the upper bearing shell and are arranged on the side of the second oil outlet hole away from the heavy load area.

[0011] As an improvement, the diameter of the first oil outlet hole is equal to the diameter of the second oil outlet hole, and the diameter of the third oil outlet hole is larger than the diameter of the second oil outlet hole.

[0012] As an improvement, the upper bearing shell and the lower bearing shell are respectively semi-circular ring-shaped bodies. The thinning amounts △T of the first thinning area of the upper bearing shell, the second thinning area of the upper bearing shell, the first thinning area of the lower bearing shell, and the second thinning area of the lower bearing shell increase in sequence from the inside of the semi-circular ring-shaped body to the bearing shell opening. The thinning amount △T is 0.01% - 0.02% of the diameter of the semi-circular ring-shaped body.

[0013] As an improvement, an upper bearing shell positioning structure is provided between the big end of the connecting rod and the upper bearing shell, and a lower bearing shell positioning structure is provided between the connecting rod cover and the lower bearing shell. The upper bearing shell positioning structure is arranged outside the heavy load area.

[0014] As an improvement, the upper bearing shell positioning structure includes an upper bearing shell positioning member fixed to the big end of the connecting rod and an upper bearing shell positioning hole correspondingly arranged on the upper bearing shell. The lower bearing shell positioning structure includes a lower bearing shell positioning member fixed to the connecting rod cover and a lower bearing shell positioning hole correspondingly arranged on the lower bearing shell.

[0015] As an improvement, the upper bearing shell positioning member and the lower bearing shell positioning member are positioning screws. The upper bearing shell positioning hole and the lower bearing shell positioning hole are arranged as stepped holes. The large hole ends of the stepped holes are arranged close to the positioning screws, and the heads of the positioning screws are stuck into the large hole ends of the stepped holes.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0017] The inclined cut connecting rod of the present invention includes a connecting rod body, a connecting rod small end and a connecting rod big end respectively arranged at both ends of the connecting rod body, a connecting rod cap for buckling on the connecting rod big end, and a fastener for fixedly connecting the connecting rod cap and the connecting rod big end. A crankshaft installation hole is formed between the connecting rod cap and the connecting rod big end. The obtuse angle θ range on the side of the crankshaft installation hole corresponding to the connecting rod small end is the heavy load area; it also includes an upper bearing shell arranged on the connecting rod big end. On the inner side surfaces on both sides of the bearing shell opening of the upper bearing shell, there are respectively an upper bearing shell first thinning area and an upper bearing shell second thinning area. The upper bearing shell first thinning area corresponding to the side of the connecting rod big end close to the connecting rod body is arranged outside the connecting rod big end, and the upper bearing shell second thinning area corresponding to the side of the connecting rod big end far from the connecting rod body is arranged inside the connecting rod big end. An acute angle α is provided between the bearing shell opening of the upper bearing shell and the end face of the connecting rod big end. There are intervals respectively between the upper bearing shell first thinning area, the upper bearing shell second thinning area and the edge of the heavy load area; a lower bearing shell arranged on the connecting rod cap. On the inner side surfaces on both sides of the bearing shell opening of the lower bearing shell, there are respectively a lower bearing shell first thinning area and a lower bearing shell second thinning area. The lower bearing shell first thinning area corresponding to the side of the connecting rod big end close to the connecting rod body is arranged inside the connecting rod cap, and the lower bearing shell second thinning area corresponding to the side of the connecting rod big end far from the connecting rod body is arranged outside the connecting rod cap. An acute angle α is provided between the bearing shell opening of the lower bearing shell and the cover surface of the connecting rod cap; the connecting rod cap is buckled on the connecting rod big end, and a connecting rod split surface is formed between the connecting rod cap and the connecting rod big end. An acute angle α is provided between the bearing shell opening pressing joint surface of the upper bearing shell, the bearing shell opening pressing joint surface of the lower bearing shell and the connecting rod split surface.

[0018] Since the upper bearing shell first thinning area corresponding to the side of the connecting rod big end close to the connecting rod body is arranged outside the connecting rod big end, and the upper bearing shell second thinning area corresponding to the side of the connecting rod big end far from the connecting rod body is arranged inside the connecting rod big end, and there are intervals respectively between the upper bearing shell first thinning area, the upper bearing shell second thinning area and the edge of the heavy load area, it is avoided that the upper bearing shell first thinning area coincides with the heavy load area, so that the non-thinned part of the upper bearing shell body corresponds to the heavy load area, avoiding overload of the connecting rod bearing shell. The inclined cut connecting rod of the embodiment of the present invention solves the problem that the thinning area of the connecting rod bearing shell of the existing inclined cut connecting rod is prone to cause overload of the connecting rod bearing shell, and can improve the reliability of the connecting rod bearing shell. Description of the Drawings

[0019] Figure 1 is a schematic cross-sectional structure diagram of the inclined cut connecting rod of the embodiment of the present invention;

[0020] Figure 2 is an enlarged schematic cross-sectional structure diagram of the upper bearing shell of the inclined cut connecting rod of the embodiment of the present invention;

[0021] Figure 3 is an enlarged schematic bottom view structure diagram of the upper bearing shell of the inclined cut connecting rod of the embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the second thinning area of the upper bearing shell of the inclined cut connecting rod according to an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of the installation structure of the upper bearing shell and the lower bearing shell of the inclined cut connecting rod according to an embodiment of the present invention;

[0024] Wherein, 11, connecting rod body; 12, small end of connecting rod; 13, big end of connecting rod; 14, first oil groove at big end; 15, second oil groove at big end; 17, oil groove at small end; 18, communicating oil groove; 20, connecting rod cap; 21, oil groove on cap body; 30, heavy load area; 40, upper bearing shell; 41, first thinning area of upper bearing shell; 42, second thinning area of upper bearing shell; 43, first oil groove of upper bearing shell; 44, second oil groove of upper bearing shell; 45, first oil outlet hole; 46, second oil outlet hole; 47, third oil outlet hole; 48, positioning hole of upper bearing shell; 50, lower bearing shell; 51, first thinning area of lower bearing shell; 52, second thinning area of lower bearing shell; 53, oil groove of lower bearing shell; 54, positioning hole of lower bearing shell; 61, positioning member of upper bearing shell; 62, positioning member of lower bearing shell. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Figures 1 to 5 It is a schematic diagram of the structure of the inclined cut connecting rod according to an embodiment of the present invention, wherein, Figure 1 It shows a schematic cross-sectional structure diagram of the inclined cut connecting rod according to an embodiment of the present invention, Figure 2 It shows a schematic enlarged cross-sectional structure diagram of the upper bearing shell of the inclined cut connecting rod according to an embodiment of the present invention, Figure 3 It shows a schematic enlarged bottom view structure diagram of the upper bearing shell of the inclined cut connecting rod according to an embodiment of the present invention, Figure 4 It shows a schematic diagram of the second thinning area of the upper bearing shell of the inclined cut connecting rod according to an embodiment of the present invention, Figure 5 It shows a schematic diagram of the installation structure of the upper bearing shell and the lower bearing shell of the inclined cut connecting rod according to an embodiment of the present invention. For the convenience of description, only the parts related to the embodiments of the present invention are shown in the figure.

[0027] It should be noted that if the present invention involves directional indications (such as up, down, front, back, etc.), the directional indications are only used to explain the relative position relationship between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly; if the present invention involves descriptions such as "first" and "second", the descriptions of "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0028] As shown Figures 1 to 5 in the figure, an inclined cut connecting rod is disclosed in an embodiment of the present invention, which includes a connecting rod body 11, a connecting rod small head 12 and a connecting rod big head 13 respectively arranged at two ends of the connecting rod body 11, a connecting rod cap 20 for buckling on the connecting rod big head 13, and a fastener for fixedly connecting the connecting rod cap 20 and the connecting rod big head 13. A crankshaft installation hole is formed between the connecting rod cap 20 and the connecting rod big head 13. The obtuse angle θ range on the side of the crankshaft installation hole corresponding to the connecting rod small head 12 is a heavy load area 30. Usually, the fastener is a bolt. It also includes an upper bearing shell 40 arranged on the connecting rod big head 13. On the inner side surfaces on both sides of the mouth of the upper bearing shell 40, there are respectively an upper bearing shell first thinning area 41 and an upper bearing shell second thinning area 42. The central angle corresponding to the upper bearing shell first thinning area 41 and the upper bearing shell second thinning area 42 is an acute angle β. The upper bearing shell first thinning area 41 corresponding to the side of the connecting rod big head 13 close to the connecting rod body 11 is arranged outside the connecting rod big head 13, and the upper bearing shell second thinning area 42 corresponding to the side of the connecting rod big head 13 far from the connecting rod body 11 is arranged inside the connecting rod big head 13. There is an acute angle α between the mouth of the upper bearing shell 40 and the end face of the connecting rod big head 13. There are intervals between the upper bearing shell first thinning area 41, the upper bearing shell second thinning area 42 and the edge of the heavy load area 30 respectively. A lower bearing shell 50 arranged on the connecting rod cap 20. On the inner side surfaces on both sides of the mouth of the lower bearing shell 50, there are respectively a lower bearing shell first thinning area 51 and a lower bearing shell second thinning area 52. The central angle corresponding to the lower bearing shell first thinning area 51 and the lower bearing shell second thinning area 52 is an acute angle β. The lower bearing shell first thinning area 51 corresponding to the side of the connecting rod big head 13 close to the connecting rod body 11 is arranged inside the connecting rod cap 20, and the lower bearing shell second thinning area 52 corresponding to the side of the connecting rod big head 13 far from the connecting rod body 11 is arranged outside the connecting rod cap 20. There is an acute angle α between the mouth of the lower bearing shell 50 and the cover surface of the connecting rod cap 20. Usually, the acute angle α is greater than or equal to 50 degrees and less than or equal to 60 degrees. The connecting rod cap 20 is buckled on the connecting rod big head 13, and a connecting rod split surface is formed between the connecting rod cap 20 and the connecting rod big head 13. There is an acute angle α between the compression joint surface at the mouth of the upper bearing shell 40, the compression joint surface at the mouth of the lower bearing shell 50 and the connecting rod split surface.

[0029] Since the upper bearing shell first thinning area 41 corresponding to the side of the connecting rod big head 13 close to the connecting rod body 11 is arranged outside the connecting rod big head 13, and the upper bearing shell second thinning area 42 corresponding to the side of the connecting rod big head 13 far from the connecting rod body 11 is arranged inside the connecting rod big head 13, and there are intervals between the upper bearing shell first thinning area 41, the upper bearing shell second thinning area 42 and the edge of the heavy load area 30 respectively, it is avoided that the upper bearing shell first thinning area 41 coincides with the heavy load area 30, so that the non-thinned part of the upper bearing shell 40 is arranged corresponding to the heavy load area 30, and it is avoided that the connecting rod bearing shell is overloaded. The inclined cut connecting rod in the embodiment of the present invention solves the problem that the thinning area of the connecting rod bearing shell of the existing inclined cut connecting rod is easy to cause the overload of the connecting rod bearing shell, and can improve the reliability of the connecting rod bearing shell.

[0030] In an embodiment of the present invention, the upper bearing shell 40 is provided on the big end 13 of the connecting rod, corresponding to the heavy load area 30. Generally, the obtuse angle θ is greater than or equal to 100 degrees and less than or equal to 120 degrees, and the acute angle β is greater than or equal to 17.5 degrees and less than or equal to 22.5 degrees. On the premise of avoiding overload of the connecting rod bearing shell, the heavy load bearing range can be increased.

[0031] In an embodiment of the present invention, a first big end oil groove 14 is provided on the inner side surface of the big end 13 of the connecting rod close to the connecting rod body 11, and a second big end oil groove 15 is provided on the inner side surface of the big end 13 of the connecting rod far from the connecting rod body 11. The first big end oil groove 14 and the second big end oil groove 15 are arranged circumferentially along the inner side surface of the big end 13 of the connecting rod, and respectively extend to the fastening surfaces on the corresponding sides between the big end 13 of the connecting rod and the connecting rod cover 20; a cover body oil groove 21 is provided on the inner side surface of the connecting rod cover 20, and the cover body oil groove 21 is arranged circumferentially along the inner side surface of the connecting rod cover 20, and both ends of the cover body oil groove 21 respectively extend to the fastening surfaces on the corresponding sides between the connecting rod cover 20 and the big end 13 of the connecting rod; a communicating oil groove is provided between the first big end oil groove 14 and the small end oil groove provided on the inner side surface of the small end 12 of the connecting rod; the connecting rod cover 20 is fastened to the big end 13 of the connecting rod, and both ends of the cover body oil groove 21 are respectively communicated with the first big end oil groove 14 and the second big end oil groove 15.

[0032] Correspondingly, a first upper bearing shell oil groove 43 is provided on the inner side surface of the upper bearing shell 40 corresponding to the first thinning area 41 of the upper bearing shell, and a second upper bearing shell oil groove 44 is provided on the inner side surface of the upper bearing shell 40 corresponding to the second thinning area 42 of the upper bearing shell. The first upper bearing shell oil groove 43 and the second upper bearing shell oil groove 44 are arranged circumferentially along the upper bearing shell 40 and respectively extend to the side edges of the mouth of the upper bearing shell 40; a first oil outlet hole 45 is provided between the first upper bearing shell oil groove 43 and the cover body oil groove 21, and the first oil outlet hole 45 is provided at the end of the first upper bearing shell oil groove 43 far from the fastening surface between the big end 13 of the connecting rod and the connecting rod cover 20; a second oil outlet hole 46 is provided between the second upper bearing shell oil groove 44 and the second big end oil groove 15, and the second oil outlet hole 46 is provided at the end of the second upper bearing shell oil groove 44 far from the fastening surface between the big end 13 of the connecting rod and the connecting rod cover 20. The first oil outlet hole 45 and the second oil outlet hole 46 can effectively lubricate the part of the upper bearing shell 40 corresponding to the heavy load area 30.

[0033] Furthermore, the ends of the second upper bearing shell oil groove 44 and the second big end oil groove 15 far from the fastening surface between the big end 13 of the connecting rod and the connecting rod cover 20 extend to the heavy load area 30. At least two third oil outlet holes 47 are further provided between the second upper bearing shell oil groove 44 and the second big end oil groove 15. The at least two third oil outlet holes 47 are arranged at intervals circumferentially along the upper bearing shell 40, and are provided on the side of the second oil outlet hole 46 far from the heavy load area 30, which can further enhance the lubrication effect of the part of the upper bearing shell 40 corresponding to the heavy load area 30.

[0034] Specifically, the diameter of the first oil outlet hole 45 is equal to that of the second oil outlet hole 46, and the diameter of the third oil outlet hole 47 is larger than that of the second oil outlet hole 46. Generally, there are two third oil outlet holes 47.

[0035] Meanwhile, an inner oil groove 53 of the lower bearing shell 50 is provided on the inner side surface of the lower bearing shell 50. The inner oil groove 53 is arranged along the circumferential direction of the inner side surface of the lower bearing shell 50, and both end portions of the inner oil groove 53 extend to the bearing shell opening of the lower bearing shell 50 respectively; the lower bearing shell 50 is not provided with a lower bearing shell oil outlet hole, which can further ensure the lubrication effect of the bearing shell part of the upper bearing shell 40 corresponding to the heavy load area 30.

[0036] In the embodiment of the present invention, the upper bearing shell 40 and the lower bearing shell 50 are respectively semi-circular bearing shell bodies. The thinning amounts △T of the first thinning area 41 of the upper bearing shell, the second thinning area 42 of the upper bearing shell, the first thinning area 51 of the lower bearing shell, and the second thinning area 52 of the lower bearing shell increase successively from the inside of the semi-circular bearing shell body to the bearing shell opening. The thinning amount △T is 0.01% - 0.02% of the diameter of the semi-circular bearing shell body, as Figure 4 shown.

[0037] In the embodiment of the present invention, as Figure 5 shown, an upper bearing shell positioning structure is provided between the big end 13 of the connecting rod and the upper bearing shell 40, and a lower bearing shell positioning structure is provided between the connecting rod cap 20 and the lower bearing shell 50. The upper bearing shell positioning structure is arranged outside the heavy load area 30 to avoid having an adverse impact on the bearing surface of the upper bearing shell 40.

[0038] Specifically, the upper bearing shell positioning structure includes an upper bearing shell positioning member 61 fixed to the big end 13 of the connecting rod and an upper bearing shell positioning hole 48 correspondingly arranged on the upper bearing shell 40. The lower bearing shell positioning structure includes a lower bearing shell positioning member 62 fixed to the connecting rod cap 20 and a lower bearing shell positioning hole 54 correspondingly arranged on the lower bearing shell 50. Generally, the upper bearing shell positioning member 61 and the lower bearing shell positioning member 62 are positioning screws. The upper bearing shell positioning hole 48 and the lower bearing shell positioning hole 54 are arranged as stepped holes. The large hole ends of the stepped holes are arranged close to the positioning screws, and the heads of the positioning screws are stuck into the large hole ends of the stepped holes, which can avoid the positioning screws from damaging the crankshaft journal.

[0039] The above are examples of the best implementation manners of the present invention, and the parts not described in detail therein are all common general knowledge of those skilled in the art. The protection scope of the present invention shall be subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present invention is also within the protection scope of the present invention.

Claims

1. An inclined cut connecting rod, comprising a connecting rod body, a connecting rod small end and a connecting rod big end respectively arranged at two ends of the connecting rod body, a connecting rod cap for buckling on the connecting rod big end, and a fastener for fixedly connecting the connecting rod cap and the connecting rod big end. A crankshaft mounting hole is formed between the connecting rod cap and the connecting rod big end, and the obtuse angle θ range on the side corresponding to the connecting rod small end of the crankshaft mounting hole is a heavy load area; it is characterized in that, It further includes an upper half bearing provided at the big end of the connecting rod. On the inner sides of both sides of the bearing mouth of the upper half bearing, there are respectively provided an upper half bearing first thinning area and an upper half bearing second thinning area. The upper half bearing first thinning area corresponding to the side of the big end of the connecting rod close to the connecting rod body is provided outside the big end of the connecting rod, and the upper half bearing second thinning area corresponding to the side of the big end of the connecting rod away from the connecting rod body is provided inside the big end of the connecting rod. An acute angle α is provided between the bearing mouth of the upper half bearing and the end face of the big end of the connecting rod. There are intervals respectively between the upper half bearing first thinning area, the upper half bearing second thinning area and the edge of the heavy load area; a lower half bearing provided at the connecting rod cap. On the inner sides of both sides of the bearing mouth of the lower half bearing, there are respectively provided a lower half bearing first thinning area and a lower half bearing second thinning area. The lower half bearing first thinning area corresponding to the side of the big end of the connecting rod close to the connecting rod body is provided inside the connecting rod cap, and the lower half bearing second thinning area corresponding to the side of the big end of the connecting rod away from the connecting rod body is provided outside the connecting rod cap. An acute angle α is provided between the bearing mouth of the lower half bearing and the cover face of the connecting rod cap; the connecting rod cap is buckled on the big end of the connecting rod, a connecting rod parting surface is formed between the connecting rod cap and the big end of the connecting rod, and an acute angle α is provided between the bearing mouth pressing joint surface of the upper half bearing, the bearing mouth pressing joint surface of the lower half bearing and the connecting rod parting surface.

2. The inclined cut link according to claim 1, wherein The acute angle α is greater than or equal to 50 degrees and less than or equal to 60 degrees, and the obtuse angle θ is greater than or equal to 100 degrees and less than or equal to 120 degrees; the central angles corresponding to the lower half bearing first thinning area and the lower half bearing second thinning area are acute angles β, and the acute angle β is greater than or equal to 17.5 degrees and less than or equal to 22.5 degrees.

3. The inclined cut connecting rod according to claim 1, wherein, On the inner side surface of the side of the big end of the connecting rod close to the connecting rod body, there is provided a big end first oil groove, and on the inner side surface of the side of the big end of the connecting rod away from the connecting rod body, there is provided a big end second oil groove. The first oil groove and the big end second oil groove are arranged circumferentially along the inner side surface of the big end of the connecting rod and respectively extend to the buckling surfaces on the corresponding sides between the big end of the connecting rod and the connecting rod cap; on the inner side surface of the connecting rod cap, there is provided a cap body oil groove. The cap body oil groove is arranged circumferentially along the inner side surface of the connecting rod cap, and both ends of the cap body oil groove respectively extend to the buckling surfaces on the corresponding sides between the connecting rod cap and the big end of the connecting rod; the connecting rod cap is buckled on the big end of the connecting rod, and both ends of the cap body oil groove are respectively communicated with the big end first oil groove and the big end second oil groove.

4. The inclined cut link according to claim 3, characterized in that, On the inner side of the upper half bearing shell corresponding to one side of the first thinning area of the upper half bearing shell, there is a first oil groove of the upper half bearing shell. On the inner side of the upper half bearing shell corresponding to one side of the second thinning area of the upper half bearing shell, there is a second oil groove of the upper half bearing shell. The first oil groove of the upper half bearing shell and the second oil groove of the upper half bearing shell are arranged along the circumferential direction of the upper half bearing shell and respectively extend to the side edge of the bearing shell opening; between the first oil groove of the upper half bearing shell and the cover body oil groove, there is a first oil outlet hole, and the first oil outlet hole is arranged at the end of the first oil groove of the upper half bearing shell far away from the fastening surface between the big end of the connecting rod and the connecting rod cover; between the second oil groove of the upper half bearing shell and the second oil groove of the big end, there is a second oil outlet hole, and the second oil outlet hole is arranged at the end of the second oil groove of the upper half bearing shell far away from the fastening surface between the big end of the connecting rod and the connecting rod cover.

5. The inclined cut link according to claim 4, wherein The ends of the second oil groove of the upper half bearing shell and the second oil groove of the big end far away from the fastening surface between the big end of the connecting rod and the connecting rod cover extend to the heavy load area. Between the second oil groove of the upper half bearing shell and the second oil groove of the big end, there are also at least two third oil outlet holes. The at least two third oil outlet holes are arranged at intervals along the circumferential direction of the upper half bearing shell and are arranged on the side of the second oil outlet hole far away from the heavy load area.

6. The inclined cut connecting rod according to claim 5, wherein, The diameter of the first oil outlet hole is equal to the diameter of the second oil outlet hole, and the diameter of the third oil outlet hole is larger than the diameter of the second oil outlet hole.

7. The inclined cut link according to claim 1, wherein The upper half bearing shell and the lower half bearing shell are respectively semi-circular bearing shell bodies. The thinning amounts △T of the first thinning area of the upper half bearing shell, the second thinning area of the upper half bearing shell, the first thinning area of the lower half bearing shell, and the second thinning area of the lower half bearing shell increase sequentially from the inside of the semi-circular bearing shell body to the bearing shell opening. The thinning amount △T is 0.01% - 0.02% of the diameter of the semi-circular bearing shell body.

8. The inclined cut connecting rod according to any one of claims 1 to 7, characterized in that, There is an upper half bearing shell positioning structure between the big end of the connecting rod and the upper half bearing shell, and there is a lower half bearing shell positioning structure between the connecting rod cover and the lower half bearing shell. The upper half bearing shell positioning structure is arranged outside the heavy load area.

9. The inclined cut connecting rod according to claim 8, wherein, The upper half bearing shell positioning structure includes an upper half bearing shell positioning part fixed to the big end of the connecting rod and an upper half bearing shell positioning hole correspondingly arranged on the upper half bearing shell. The lower half bearing shell positioning structure includes a lower half bearing shell positioning part fixed to the connecting rod cover and a lower half bearing shell positioning hole correspondingly arranged on the lower half bearing shell.

10. The inclined cut connecting rod according to claim 9, characterized in that, The upper half bearing shell positioning part and the lower half bearing shell positioning part are positioning screws. The upper half bearing shell positioning hole and the lower half bearing shell positioning hole are arranged as stepped holes. The large hole end of the stepped hole is arranged close to the positioning screw, and the head of the positioning screw is stuck into the large hole end of the stepped hole.

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