Connecting rod and compressor

Abstract

The application discloses a connecting rod and a compressor. The connecting rod comprises a rod body, a first connecting part, a second connecting part and a stepped part. The rod body comprises a first end and a second end opposite in the length direction of the rod body. The first connecting part is arranged at the first end of the rod body and has a first through hole extending in the thickness direction of the rod body. The crankshaft is matched in the first through hole. The second connecting part is arranged at the second end of the rod body and has a second through hole extending in the thickness direction of the rod body. The piston pin is matched in the second through hole. The stepped part is arranged on the rod body and protrudes outward in the thickness direction of the rod body. The stepped part is connected with the first connecting part. The connecting rod can increase the pressure bearing area between the connecting rod and the crankshaft, reduce the rough contact pressure between the crankshaft and the connecting rod, reduce the wear of the crankshaft and the connecting rod, prevent the compressor from being stuck, and improve the reliability of the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a connecting rod and a compressor. BACKGROUND

[0002] In the related art, when the connecting rod moves to the exhaust point during the operation of the compressor, the oil film thickness between the crankshaft and the connecting rod is small due to the small pressure bearing area therebetween, the rough contact pressure between the crankshaft and the connecting rod is large, and the wear between the crankshaft and the connecting rod is serious, thereby affecting the service life of the connecting rod and the crankshaft, and even causing the compressor to be stuck. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, an embodiment of one aspect of the present application proposes a connecting rod capable of increasing the pressure bearing area between the connecting rod and the crankshaft, reducing the rough contact pressure between the crankshaft and the connecting rod, reducing the wear between the crankshaft and the connecting rod, preventing the compressor from being stuck, and improving the reliability of the compressor.

[0005] According to an embodiment of another aspect of the present application, a compressor is proposed.

[0006] The connecting rod according to the embodiment of the first aspect of the present application is adapted to connect a crankshaft and a piston pin, and includes a rod body including a first end and a second end opposite in a length direction thereof, a first connecting portion provided at the first end of the rod body and having a first through hole extending in a thickness direction of the rod body, the crankshaft being fitted in the first through hole, a second connecting portion provided at the second end of the rod body and having a second through hole extending in the thickness direction of the rod body, the piston pin being fitted in the second through hole, and a stepped portion provided on the rod body and protruding outward in the thickness direction of the rod body, the stepped portion being connected with the first connecting portion.

[0007] According to the connecting rod of the embodiment of the present application, the rigidity of the connecting rod is improved by providing the stepped portion, and when the connecting rod moves to the exhaust point, the connecting rod is deformed to be offset to the side of the crankshaft under the pressure of the crankshaft, thereby increasing the contact area between the inner wall surface of the first through hole and the outer peripheral surface of the crankshaft, i.e., increasing the pressure bearing area of the connecting rod, reducing the rough contact pressure between the crankshaft and the connecting rod, reducing the wear between the crankshaft and the connecting rod, preventing the compressor from being stuck, and improving the reliability of the compressor.

[0008] In some embodiments, the shaft further includes a first side surface and a second side surface oppositely arranged in a thickness direction of the shaft, the stepped portion protrudes from the first side surface of the shaft in a direction away from the second side surface of the shaft, the first connecting portion includes a first end surface and a second end surface in the thickness direction of the shaft, and the stepped portion is located between the first end surface of the first connecting portion and the first side surface of the shaft in the thickness direction of the shaft.

[0009] In some embodiments, a dimension of the first side surface of the shaft to the first end surface of the first connecting portion in the thickness direction of the shaft is H, and 0.1H1≤H≤0.6H1, where H1 is a dimension of the first through hole in the thickness direction of the shaft.

[0010] In some embodiments, the stepped portion includes a first side surface and a second side surface oppositely arranged in a thickness direction of the shaft, the second side surface of the stepped portion is connected to the first side surface of the shaft, and a dimension of the first side surface of the stepped portion to the first end surface of the first connecting portion in the thickness direction of the shaft is h, and 0.3H≤h≤0.8H.

[0011] In some embodiments, the stepped portion includes a third side surface and a fourth side surface oppositely arranged in a length direction of the shaft, the third side surface of the stepped portion is connected to an outer circumferential surface of the first connecting portion, a dimension of the fourth side surface of the stepped portion to an inner wall surface of the first through hole in the length direction of the stepped portion is t, and 0.3D≤t≤0.6D, where D is a diameter of the crankshaft, a dimension of the third side surface of the stepped portion to the inner wall surface of the first through hole in the length direction of the stepped portion is t1, and 0.1D≤t1≤0.25D, where D is the diameter of the crankshaft.

[0012] In some embodiments, the first side surface of the stepped portion is arc-shapedly transitioned to the fourth side surface of the stepped portion, and the first side surface of the stepped portion is arc-shapedly transitioned to the outer circumferential surface of the first connecting portion.

[0013] In some embodiments, the stepped portion includes a fifth side surface and a sixth side surface oppositely arranged in a width direction of the shaft, the shaft includes a third side surface and a fourth side surface oppositely arranged in the width direction of the shaft, the third side surface of the shaft is substantially flush with the fifth side surface of the stepped portion in the thickness direction of the shaft, and the fourth side surface of the shaft is substantially flush with the sixth side surface of the stepped portion in the thickness direction of the shaft.

[0014] In some embodiments, the first connecting portion is clearance-fitted with the crankshaft.

[0015] In some embodiments, the first end of the shaft and the outer periphery of the first connecting portion are arc-shaped transitions, and the second end of the shaft and the outer periphery of the second connecting portion are arc-shaped transitions.

[0016] The compressor according to the embodiments of the second aspect of the present application includes the connecting rod according to any one of the above embodiments.

[0017] The compressor according to the embodiments of the present application uses the connecting rod, reduces the wear of the crankshaft and the connecting rod, prevents the compressor from being stuck, and improves the reliability of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the connecting rod according to the embodiments of the present application.

[0019] Figure 2 is Figure 1 is a sectional view of the connecting rod shown in FIG. 1.

[0020] Figure 3 is Figure 1 is a top view of the connecting rod shown in FIG. 1.

[0021] FIGS. 4(a) and 4(b) are stress analysis nephograms when the connecting rod in the related art is matched with the crankshaft.

[0022] Figure 5 is a stress analysis nephogram when the connecting rod according to the embodiments of the present application is matched with the crankshaft.

[0023] REFERENCE NUMERALS:

[0024] shaft 1, first end 101, second end 102, first side of the shaft 103, second side of the shaft 104, third side of the shaft 105, fourth side of the shaft 106,

[0025] first connecting portion 2, first through hole 201, first end surface 202, second end surface 203,

[0026] second connecting portion 3, second through hole 301,

[0027] stepped portion 4, first side of the stepped portion 401, fourth side of the stepped portion 402, fifth side of the stepped portion 403, sixth side of the stepped portion 404. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0029] As Figures 1 to 3As shown, according to the connecting rod of the embodiment of the present application, the connecting rod is adapted to connect the crankshaft and the piston pin, and the connecting rod comprises a rod body 1, a first connecting portion 2, a second connecting portion 3 and a stepped portion 4.

[0030] The rod body 1 comprises a first end 101 (the left end of the rod body 1) and a second end 102 (the right end of the rod body 1) opposite to each other in the left-right direction (the length direction of the rod body 1). Figure 1 Figure 1 Figure 1

[0031] The first connecting portion 2 is arranged at the first end 101 of the rod body 1 and has a first through hole 201 extending along the thickness direction (the up-down direction) of the rod body 1, and the crankshaft is fitted in the first through hole 201. Figure 1

[0032] The second connecting portion 3 is arranged at the second end 102 of the rod body 1 and has a second through hole 301 extending along the thickness direction of the rod body 1, and the piston pin is fitted in the second through hole 301.

[0033] The stepped portion 4 is arranged on the rod body 1 and protrudes outwardly along the thickness direction of the rod body 1. Figure 1 As shown, the stepped portion 4 is arranged on the rod body 1 and protrudes outwardly along the up-down direction, and the stepped portion 4 is connected with the first connecting portion 2.

[0034] According to the connecting rod of the embodiment of the present application, by arranging the stepped portion, the rigidity of the connecting rod is adjusted to be coordinated with the deformation of the crankshaft. When the connecting rod moves to the exhaust stage, the crankshaft is tilted and deformed, the large end surface of the connecting rod is deformed to match the tilt and deformation of the crankshaft, the clearance of the whole surface is more uniform, the oil film thickness is more uniform, the oil film carrying capacity is increased, the rough contact pressure between the crankshaft and the connecting rod is reduced, and the contact area between the inner wall surface of the first through hole and the outer peripheral surface of the crankshaft is increased, the maximum contact pressure is reduced, the wear between the crankshaft and the connecting rod is reduced, the compressor is prevented from being stuck, and the reliability of the compressor is improved.

[0035] As shown in FIG. 4, in one case of the related art, the local rigidity of the connecting rod is too large, and then the local contact stress between the crankshaft and the connecting rod is too large, the contact area is small, and the wear between the crankshaft and the connecting rod is large. Figure 5 As shown in FIG. 4(b), in another case of the connecting rod of the related art, the local rigidity of the connecting rod is too small, and then the local contact stress between the crankshaft and the connecting rod is too large near the rod body, the contact area is small, and the wear between the crankshaft and the connecting rod is large. As shown in FIGS. 4(a) and 4(b), the connecting rod of the embodiment eliminates the local contact between the crankshaft and the connecting rod, that is, reduces the rough contact pressure between the crankshaft and the connecting rod, and the contact between the crankshaft and the connecting rod is more uniform, that is, the contact area between the crankshaft and the connecting rod is increased, and thus the wear between the crankshaft and the connecting rod is reduced.​​​

[0036] In some embodiments, the rod body 1 further includes a first side surface arranged opposite to it in its thickness direction. Figure 1 The upper side of the shaft 1) and the second side ( Figure 1 The lower side of the shaft 1), the stepped portion 4 protrudes from the first side 103 of the shaft in a direction away from the second side 104 of the shaft. The first connecting portion 2 includes a first end face 202 along the thickness direction of the shaft 1 (the lower side of the shaft 1). Figure 1 The upper end face of the first connecting part 2) and the second end face 203 ( Figure 1 (Lower end face of the first connecting part 2 in the middle).

[0037] The stepped portion 4 is located between the first end face 202 of the first connecting portion 2 and the first side face 103 of the rod body in the thickness direction of the rod body. For example... Figure 1 As shown, the stepped portion 4 is located between the upper end face of the first connecting portion 2 and the upper side face of the rod body 1 in the vertical direction. In other words, the upper surface of the stepped portion 4 does not extend beyond the upper end face of the first connecting portion 2 in the vertical direction.

[0038] In some other embodiments, the stepped portion 4 may also protrude from the second side 104 of the shaft in a direction opposite to the first side 103 of the shaft. (See reference...) Figure 1 The stepped portion 4 protrudes from the lower side of the pole body 1 in a direction away from the upper side of the pole body 1, and the lower surface of the stepped portion 4 does not extend beyond the lower end face of the first connecting portion 2 in the vertical direction.

[0039] In some embodiments, the dimension of the first side surface 103 of the rod to the first end face 202 of the first connecting portion 2 in the thickness direction of the rod 1 is H. For example... Figure 1 As shown, H is the dimension of the upper side of the rod body 1 to the upper end face of the first connecting part 2 in the vertical direction, and 0.1H1≤H≤0.6H1, where H1 is the dimension of the first through hole 201 in the thickness direction of the rod body 1. When the dimension of H is within the above range, the flexibility of the connecting rod is improved, so that the connecting rod can deform together with the crankshaft.

[0040] In some embodiments, the stepped portion 4 includes a first side surface 401 arranged opposite to the body 1 along the thickness direction. Figure 1 The upper side of the middle stepped section 4) and the second side ( Figure 2 The lower side of the middle step section 4), the second side of the step section 4 is connected to the first side 103 of the rod body 1, such as Figure 2 As shown, the lower side of the stepped section 4 is connected to the upper side of the rod body 1.

[0041] The dimension of the first side surface 401 of the stepped portion and the first end face 202 of the first connecting portion 2 in the thickness direction of the rod body 1 is h, as shown below. Figure 1As shown, h is the dimension of the upper side of the stepped portion 4 and the upper end surface of the first connecting portion 2 in the up-down direction, and 0.3H≤h≤0.8H.

[0042] In some embodiments, the stepped portion 4 includes a third side surface (left side surface of the stepped portion 4) and a fourth side surface (right side surface of the stepped portion 4) arranged oppositely along the length direction of the rod body 1. Figure 2 Figure 2 The third side surface of the stepped portion 4 is connected to the outer peripheral surface of the first connecting portion 2, and the fourth side surface of the stepped portion 4 is connected to the inner wall surface of the first through hole 201 in the length direction of the stepped portion 4. As shown, the dimension of the right side surface of the stepped portion 4 and the inner wall surface of the first through hole 201 in the left-right direction is t, and 0.3D≤t≤0.6D, where D is the diameter of the crankshaft. The dimension of the third side surface of the stepped portion 4 and the inner wall surface of the first through hole 201 in the length direction of the stepped portion 4 is t1, and 0.1D≤t1≤0.25D. Figure 2

[0043] When the dimensions of h and t are within the above ranges, the connecting rod has both partial flexibility and partial rigidity, so that it has certain load capacity while deforming at the edges, and the contact stress in the thickness direction is more uniform.

[0044] In some embodiments, the first side surface 401 of the stepped portion and the fourth side surface 402 of the stepped portion are arc-shaped transitions, and the first side surface 401 of the stepped portion and the outer peripheral surface of the first connecting portion 2 are arc-shaped transitions. As shown, the upper side of the stepped portion 4 and the right side surface of the stepped portion 4 are arc-shaped transitions, and the upper side of the stepped portion 4 and the outer peripheral surface of the first connecting portion 2 are arc-shaped transitions. The arc-shaped transitions can reduce stress concentration and improve the strength of the connecting rod. Figure 2

[0045] In some embodiments, the stepped portion 4 includes a fifth side surface (front side surface of the stepped portion 4) and a sixth side surface (rear side surface of the stepped portion 4) arranged oppositely in the width direction (front-rear direction) of the rod body 1. Figure 2 Figure 1 Figure 1 The rod body 1 includes a third side surface (front side surface of the rod body 1) and a fourth side surface (rear side surface of the rod body 1) arranged oppositely in the width direction thereof. Figure 3 Figure 1 Figure 3 Figure 1

[0046] ​​​​​​​​​The third side surface 105 of the rod body is substantially flush with the fifth side surface 403 of the stepped portion in the thickness direction of the rod body 1, and the fourth side surface 106 of the rod body is substantially flush with the sixth side surface 404 of the stepped portion in the thickness direction of the rod body 1. In other words, the front side surface of the rod body 1 is in the same plane as the front side surface of the stepped portion 4, and the rear side surface of the rod body 1 is in the same plane as the rear side surface of the stepped portion 4.

[0047] In some embodiments, the first connecting portion 2 is clearance fit with the crankshaft.

[0048] In some embodiments, the first end 101 of the rod body 1 and the outer periphery of the first connecting portion 2 are arc-shaped transitions, and the second end 102 of the rod body 1 and the outer periphery of the second connecting portion 3 are arc-shaped transitions. As shown in the drawings, the left end of the rod body 1 and the outer periphery of the first connecting portion 2 are arc-shaped transitions, and the right end of the rod body 1 and the outer periphery of the second connecting portion 3 are arc-shaped transitions, which can reduce stress concentration and improve the strength of the connecting rod. Figure 1

[0049] The connecting rod of some specific examples of the present application will be described below with reference to the drawings. Figure 1

[0050] As shown in the drawings, the connecting rod of some specific examples of the present application includes a rod body 1, a first connecting portion 2, a second connecting portion 3, and a stepped portion 4. Figures 1 to 3 The first connecting portion 2 and the second connecting portion 3 are respectively connected to the left and right ends of the rod body 1, the first connecting portion 2 extends in the up-down direction and has a first through hole 201, the first through hole 201 is used to cooperate with the crankshaft and the cooperation relationship between them is clearance fit. The second connecting portion 3 extends in the up-down direction and has a second through hole 301, the second through hole 301 is used to cooperate with the piston pin.

[0051] The stepped portion 4 is provided on the upper side surface of the rod body 1 and protrudes upward, the left end of the stepped portion 4 is connected to the outer periphery of the first connecting portion 2, the upper side surface of the stepped portion 4 is lower than the upper end surface of the first connecting portion 2, and the front side surface of the stepped portion 4 and the front side surface of the rod body 1 are in the same vertical plane, and the rear side surface of the stepped portion 4 and the rear side surface of the rod body 1 are in the same vertical plane.

[0052] As shown in the drawings, the size of the upper side surface of the rod body 1 to the upper end surface of the first connecting portion 2 in the up-down direction is H, and 0.1H1≤H≤0.6H1, wherein H1 is the size of the first through hole 201 in the up-down direction. The size of the upper side surface of the stepped portion 4 and the upper end surface of the first connecting portion 2 in the up-down direction is h, and 0.3H≤h≤0.8H.

[0053] Figure 1 Figure 2

[0054] ​​​​The left side surface of the step portion 4 and the inner wall surface of the first through-hole 201 have a dimension t1 in the left-right direction of the step portion 4, and 0.1D ≤ t1 ≤ 0.25D, where D is the diameter of the crankshaft. The right side surface of the step portion 4 and the inner wall surface of the first through-hole 201 have a dimension t in the left-right direction, and 0.3D ≤ t ≤ 0.6D.

[0055] The compressor according to the embodiment of the present application comprises the connecting rod according to the embodiment of the present application.

[0056] The compressor according to the embodiment of the present application adopts the connecting rod, reduces the wear of the crankshaft and the connecting rod, prevents the compressor from being stuck, and improves the reliability of the compressor.

[0057] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0058] In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0059] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the present application, unless otherwise explicitly specified and limited, a first feature "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0061] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the description herein of certain examples does not preclude the presence of additional examples or features in the present application. It is to be understood that different examples or features in the present application can be combined with each other at appropriate locations as is appropriate to the application.

[0062] Although the embodiments of the present application have been shown and described above, it is to be understood that the above-mentioned embodiments are exemplary, and are not to be construed as limiting the present application, and those ordinarily skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A connecting rod, characterized in that, The connecting rod is adapted to connect the crankshaft and the piston pin, the connecting rod comprising: A shaft, the shaft comprising a first end and a second end opposite each other in its length direction; A first connecting portion is provided at the first end of the rod body and has a first through hole extending along the thickness direction of the rod body, and the crankshaft is fitted into the first through hole; The second connecting part is provided at the second end of the rod body and has a second through hole extending along the thickness direction of the rod body, and the piston pin is fitted into the second through hole; A stepped portion is provided on the rod body and protrudes outward along the thickness direction of the rod body; the stepped portion is connected to the first connecting portion. The stepped portion includes a first side and a second side arranged opposite to each other along the thickness direction of the rod body. The second side of the stepped portion is connected to the first side of the rod body. The stepped portion also includes a third side and a fourth side arranged opposite to each other along the length direction of the rod body. The third side of the stepped portion is connected to the outer peripheral surface of the first connecting portion. The stepped portion is provided to adjust the stiffness of the connecting rod so that it is coordinated with the deformation of the crankshaft. The stepped portion is located between the first end face of the first connecting portion and the first side face of the rod body in the thickness direction of the rod body; The dimension of the first side of the rod to the first end face of the first connecting part in the thickness direction of the rod body is H, and 0.1H1≤H≤0.6H1, where H1 is the dimension of the first through hole in the thickness direction of the rod body; The dimension of the fourth side surface of the stepped portion and the inner wall surface of the first through hole in the length direction of the stepped portion is t, and 0.3D≤t≤0.6D, where D is the diameter of the crankshaft. The dimension of the third side surface of the stepped portion and the inner wall surface of the first through hole in the length direction of the stepped portion is t1, and 0.1D≤t1≤0.25D.

2. The connecting rod according to claim 1, characterized in that, The shaft also includes a first side and a second side arranged opposite to each other in its thickness direction, the stepped portion protruding from the first side of the shaft in a direction away from the second side of the shaft, and the first connecting portion including a first end face and a second end face along the thickness direction of the shaft.

3. The connecting rod according to claim 2, characterized in that, The dimension of the first side of the stepped portion and the first end face of the first connecting portion in the thickness direction of the rod body is h, and 0.3H≤h≤0.8H.

4. The connecting rod according to claim 2, characterized in that, The first side of the stepped portion and the fourth side of the stepped portion have an arc transition, and the first side of the stepped portion and the outer peripheral surface of the first connecting portion have an arc transition.

5. The connecting rod according to any one of claims 1-4, characterized in that, The stepped portion includes a fifth side and a sixth side arranged opposite to each other in the width direction of the shaft. The shaft includes a third side and a fourth side arranged opposite to each other in its width direction. The third side of the shaft is substantially flush with the fifth side of the stepped portion in the thickness direction of the shaft. The fourth side of the shaft is substantially flush with the sixth side of the stepped portion in the thickness direction of the shaft.

6. The connecting rod according to any one of claims 1-4, characterized in that, The first connecting part is clearance-fitted with the crankshaft.

7. The connecting rod according to any one of claims 1-4, characterized in that, The first end of the rod body and the first connecting part have an outer arc transition, and the second end of the rod body and the second connecting part have an outer arc transition.

8. A compressor, characterized in that, Includes the link as described in any one of claims 1-7.

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