CN105257406A

CN105257406A - Crankshaft connecting rod component

Info

Publication number: CN105257406A
Application number: CN201510779861.9A
Authority: CN
Inventors: 陈彪; 吕昂; 覃星念; 谭达辉; 张锦; 蔚兴建
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2015-11-13
Filing date: 2015-11-13
Publication date: 2016-01-20

Abstract

The invention discloses a crankshaft connecting rod component. The crankshaft connecting rod component comprises a crank pin positioned on a crankshaft, and a connecting rod mechanism for connecting a piston with the crankshaft. The connecting rod mechanism comprises a rod body, a connecting rod small head and a connecting rod large head. The connecting rod small head is positioned at one end of the rod body; the connecting rod small head is provided with a small head pin hole; and the small head pin hole is connected with a piston pin of the piston. The connecting rod large head is positioned at the other end of the rod body, and is provided with a large head pin hole; the large head pin hole is connected with the crank pin; and the large head pin hole and the crank pin have one center shaft. A fit surface between the large head pin hole and the crank pin is a rotating curved surface with the center shaft as a rotating shaft, wherein the generatrix of the rotating curved surface is a circular arc; and the circle center of the circular arc is positioned on a vertical parting line of the center shaft. The crankshaft connecting rod component can increase a working area between the crank pin and the large head pin hole; and on the other hand, the edge structures of the crank pin and the large head pin hole are optimized to prevent the problem of edge stress concentration.

Description

Crankshaft-link rod assembly

Technical field

The present invention relates to technical field of internal combustion engines, particularly a kind of crankshaft-link rod assembly.

Background technique

The linkage mechanism of internal-combustion engine, for connecting piston and bent axle, makes the to-and-fro motion of piston be converted to the rotary motion of bent axle, and linkage mechanism is one of piston-engined main movement bearing member.Linkage mechanism generally comprises connecting rod small end, shaft and connnecting rod big end.Connecting rod small end is used for installing wrist pin, to connect piston; The crank pin of connnecting rod big end and bent axle is in mating connection.In prior art, as depicted in figs. 1 and 2, the connnecting rod big end 11 of linkage mechanism 1 (only part illustrates) all adopts regular pin with the crank pin (not shown) of bent axle, hole is connected.Wherein the axial cross section of pin-and-hole 111 is generally rectangle, and namely the profile line of hole wall is straight line, and the edge of usual pin-and-hole 111 is also provided with lead angle or small round corner.But by the restriction of arrangement space in internal-combustion engine, pin regular like this, hole connection can cause the problem such as strength deficiency, stress raisers.Only by strengthen pin, hole dimension meet intensity can make again space arrange compact not, part is both bulk comparatively, and edge zone stress concentrate problem also can not get alleviate.

The information being disclosed in this background technique part is only intended to increase the understanding to general background of the present invention, and should not be regarded as admitting or imply in any form that this information structure has been prior art that persons skilled in the art are known.

Summary of the invention

The object of the present invention is to provide a kind of crankshaft-link rod assembly, thus overcome the shortcoming of strength deficiency, stress raisers between crankshaft-link rod assembly in prior art.

For achieving the above object, the invention provides a kind of crankshaft-link rod assembly, it comprises and is positioned at the crank pin on bent axle and the linkage mechanism for connecting piston and bent axle.Linkage mechanism comprises shaft, connecting rod small end and connnecting rod big end.Connecting rod small end is positioned at one end of shaft, and connecting rod small end is provided with microcephaly's pin-and-hole, and microcephaly's pin-and-hole is connected with the wrist pin of piston.Connnecting rod big end is positioned at the other end of shaft, and connnecting rod big end is provided with major part pin-and-hole, and major part pin-and-hole is connected with crank pin, and major part pin-and-hole and crank pin have same central shaft.The face that major part pin-and-hole matches with crank pin is take central shaft as the surface of revolution of running shaft, and wherein the bus of surface of revolution is circular arc, and the center of circle of circular arc is positioned on the perpendicular bisector of central shaft.

Preferably, in technique scheme, the hole wall of major part pin-and-hole is convex surface, and the sidewall of crank pin is concave surface.

Preferably, in technique scheme, circular arc is semi-circle.

Preferably, in technique scheme, circular arc is minor arc.

Compared with prior art, the present invention has following beneficial effect:

1. increase effective work area by the change of the shape of the fitting surface between the crank pin of crankshaft-link rod assembly and the major part pin-and-hole of linkage mechanism, reduce specific pressure, thus improve join strength and reliability;

2. by adopting the bus of surface of revolution to be circular arc, can arrangement space be saved, being conducive to reducing accessory size, and then realizing compacter design;

2. designed arc-shaped appearance of the present invention can avoid conventional pin, hole is when connecting, the problem that the stress caused because of edge wedge angle or small round corner is concentrated.

Accompanying drawing explanation

Fig. 1 is the partial schematic diagram of linkage mechanism in prior art.

Fig. 2 is the generalized section of Fig. 1 along AA line.

Fig. 3 is the partial schematic diagram according to linkage mechanism of the present invention.

Fig. 4 is the generalized section of Fig. 3 along AA line.

Fig. 5 is the assembling schematic diagram according to crankshaft-link rod assembly of the present invention.

Fig. 6 is the cross sectional representation of Fig. 5.

Main Reference Numerals illustrates:

1-linkage mechanism, 11-connnecting rod big end, 111-pin-and-hole, 2-linkage mechanism, 21-connnecting rod big end, 211-major part pin-and-hole, 22-shaft, 3-bent axle, 31-crank pin, R1-bus.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention not by the restriction of embodiment.

Clearly represent unless otherwise other, otherwise in whole specification and claims, term " comprise " or its conversion as " comprising " or " including " etc. by be understood to include the element of stating or constituent element, and do not get rid of other elements or other constituent elements.

Fig. 3 to Fig. 4 shows the partial structurtes according to the linkage mechanism 2 in the crankshaft-link rod assembly of the specific embodiment of the invention.Particularly, linkage mechanism 2 comprises shaft 22, connecting rod small end (not shown) and connnecting rod big end 21.Usually, connecting rod small end is positioned at one end of shaft 22, and connecting rod small end is provided with microcephaly's pin-and-hole, and microcephaly's pin-and-hole is connected with the wrist pin of piston.The connection of connecting rod small end and wrist pin belongs to the technology of well known to a person skilled in the art, does not repeat them here.Connnecting rod big end 21 is positioned at the other end of shaft 22, and connnecting rod big end 21 is provided with major part pin-and-hole 211.Major part pin-and-hole 211 is with the difference of the structure of the pin-and-hole of the prior art 11 shown in Fig. 1 and Fig. 2, the surface of revolution that the hole wall of major part pin-and-hole 211 is is running shaft with the central shaft of major part pin-and-hole 211, and the bus of surface of revolution is one section of circular arc, and the center of circle of this circular arc R 1 is positioned on the perpendicular bisector of the central shaft of major part pin-and-hole 211.

As shown in Figure 5 and Figure 6, crankshaft-link rod assembly of the present invention also comprises the crank pin 31 matched with linkage mechanism 2, and wherein crank pin 31 is positioned on bent axle 3.Major part pin-and-hole 211 is connected with crank pin 31, and the two has same central shaft.The sidewall shape of crank pin 31 matches with the shape of hole wall of major part pin-and-hole 211, is to be running shaft with the two common central shaft, to take circular arc R 1 as the surface of revolution of common bus.

Preferably, in one or more optional mode of execution, the hole wall of major part pin-and-hole 211 is convex surface, and correspondingly the sidewall of crank pin 31 is concave surface.

Preferably, in one or more optional mode of execution, circular arc R 1 is minor arc or semi-circle.Scrutable, those skilled in the art can design the concrete shape of circular arc according to actual needs, and the shape of circular arc of the present invention is not limited with disclosed mode of execution.

As shown in Figure 2 in prior art, the fitting surface of crank pin and pin-and-hole is common cylinder face (its section is rectangle), and in crankshaft-link rod assembly provided by the present invention, the surface of revolution (its section has the edge of circular arc R 1 shape, see Fig. 4 or Fig. 6) of the fitting surface of crank pin and major part pin-and-hole to be bus be circular arc.Therefore, one aspect of the present invention can increase the work area between crank pin and major part pin-and-hole, reduces specific pressure; Optimize the marginal texture of crank pin and major part pin-and-hole on the other hand, avoid the problem that edge stress is concentrated.In addition, crankshaft-link rod assembly of the present invention also helps space and arranges, thus can realize compacter design.

The aforementioned description to concrete exemplary of the present invention is to illustrate and the object of illustration.These descriptions not want the present invention to be defined as disclosed precise forms, and obviously, according to above-mentioned instruction, can much change and change.The object selected exemplary embodiment and describe is to explain certain principles of the present invention and practical application thereof, thus those skilled in the art can be realized and utilize various different exemplary of the present invention and various different selection and change.Scope of the present invention is intended to limited by claims and equivalents thereof.

Claims

1. a crankshaft-link rod assembly, it comprises:

Crank pin, it is positioned on bent axle; And

Linkage mechanism, it is for connecting piston and bent axle, and described linkage mechanism comprises:

Shaft,

Connecting rod small end, it is positioned at one end of described shaft, and described connecting rod small end is provided with microcephaly's pin-and-hole, and described microcephaly's pin-and-hole is connected with the wrist pin of described piston; And

Connnecting rod big end, it is positioned at the other end of described shaft, and described connnecting rod big end is provided with major part pin-and-hole, and described major part pin-and-hole is connected with described crank pin, and described major part pin-and-hole and described crank pin have same central shaft;

It is characterized in that, the surface of revolution that the face that described major part pin-and-hole matches with described crank pin is is running shaft with described central shaft, the bus of wherein said surface of revolution is circular arc, and the center of circle of described circular arc is positioned on the perpendicular bisector of described central shaft.

2. crankshaft-link rod assembly according to claim 1, is characterized in that, the hole wall of described major part pin-and-hole is convex surface, and the sidewall of described crank pin is concave surface.

3. crankshaft-link rod assembly according to claim 1, is characterized in that, described circular arc is semi-circle.

4. crankshaft-link rod assembly according to claim 1, is characterized in that, described circular arc is minor arc.