CN214007761U - Connecting rod upper bearing bush, connecting rod bearing bush and engine - Google Patents
Connecting rod upper bearing bush, connecting rod bearing bush and engine Download PDFInfo
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- CN214007761U CN214007761U CN202022759500.7U CN202022759500U CN214007761U CN 214007761 U CN214007761 U CN 214007761U CN 202022759500 U CN202022759500 U CN 202022759500U CN 214007761 U CN214007761 U CN 214007761U
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Abstract
The utility model provides a connecting rod upper bearing shell, connecting rod axle bush and engine. The connecting rod upper bearing bush comprises an upper bearing bush body, two symmetrical thinning areas are arranged on two sides of the inner side surface of the upper bearing bush body, and the wall thickness of the upper bearing bush body in the thinning areas is gradually reduced from the middle of the upper bearing bush body to two sides. The one-time thinning area in the prior art is eliminated, the thinning area with the thickness gradually reduced from the middle part to two sides is adopted, the gap between the thinning area and the crankshaft is reduced, the thinning area and the shaft diameter can be better attached, and the range of a bearing area of the bearing bush is enlarged, so that the specific pressure of the bearing bush is reduced, and the fatigue risk of the bearing bush is reduced. And the thickness mutation of the thinning area is eliminated, so that the oil film is more continuous, and the problems of serious abrasion of the primary thinning transition position and the secondary thinning transition position caused by the thickness mutation of the transition positions of the two thinning areas and discontinuous oil film of the thinning area are solved.
Description
Technical Field
The utility model relates to an engine part and engine especially relate to a connecting rod upper bearing shell, connecting rod axle bush and engine.
Background
The connecting rod bearing bush is composed of an upper connecting rod bearing bush and a lower connecting rod bearing bush, is generally arranged at the connecting part of the connecting rod and the crankshaft, is used for reducing the abrasion between the crankshaft and the connecting rod, and plays roles in abrasion resistance, connection, support and transmission.
At present, the thickness of a bearing bush on a connecting rod is usually thinned twice during processing. The thickness reduction of the shaft bushing in a certain distance from the bushing opening position of the bearing bushing along the running surface is called primary reduction, and the thickness reduction of the shaft bushing in the middle position of the bearing bushing along the running surfaces at two sides is called secondary reduction.
However, because the surface of the primary thinning area of the upper bearing bush of the connecting rod is lower than the surface of the secondary thinning area, the clearance between the primary thinning area and the crankshaft is large and is difficult to be attached to the shaft diameter, so that the bearing of the bearing bush is limited in the secondary thinning area, the specific pressure of the bearing bush is high, and the fatigue risk of the bearing bush is high. Meanwhile, thickness mutation is formed at the transition position of the two thinning areas, and oil films in the thinning areas are discontinuous, so that the transition positions of primary thinning and secondary thinning are seriously abraded.
SUMMERY OF THE UTILITY MODEL
The bearing bush bearing device aims to solve the problems that in the background art, because the surface of a primary thinning area of an upper bearing bush of a connecting rod is lower than the surface of a secondary thinning area, the bearing bush bearing is limited in the secondary thinning area due to the fact that the gap between the primary thinning area of the upper bearing bush of the existing connecting rod and a crankshaft is large and the bearing bush bearing is difficult to fit with the shaft diameter, the bearing bush is high in specific pressure and high in fatigue risk, and the transition positions of two thinning areas are suddenly changed in thickness, oil films of the thinning areas are discontinuous, and the abrasion of the transition positions of primary thinning and secondary thinning is serious.
The utility model provides a connecting rod upper bearing shell, including the upper bearing shell body, the inboard surface both sides of upper bearing shell body are equipped with two of symmetry and reduce thin district, the upper bearing shell body is in the wall thickness that reduces thin district is followed the middle part of upper bearing shell body reduces to both sides gradually.
The connecting rod upper bearing bush provided by the embodiment comprises an upper bearing bush body, two symmetrical thinning areas are arranged on two sides of the inner side surface of the upper bearing bush body, and the wall thickness of the upper bearing bush body in the thinning areas is gradually reduced from the middle of the upper bearing bush body to two sides. The one-time thinning area in the prior art is eliminated, the thinning area with the thickness gradually reduced from the middle to two sides is adopted, the gap between the thinning area and the crankshaft is reduced, the thinning area can be better attached to the shaft diameter, the range of the bearing area of the bearing bush is enlarged, the specific pressure of the bearing bush is reduced, and the fatigue risk of the bearing bush is reduced. The problem of on the current connecting rod bearing bush once reduce the area and the clearance of bent axle big and be difficult to bear the weight of the bearing bush that leads to with the laminating of shaft diameter and limit in the area of reducing of secondary, cause the bearing bush to compare highly, bearing bush fatigue risk is high is solved. And the change of the wall thickness of the upper bearing shell body in the thinning area is more gradual, the thickness mutation of the thinning area is eliminated, and the oil film is more continuous, so that the problems that the thickness mutation of the transition positions of the two thinning areas is discontinuous, and the abrasion of the transition positions of primary thinning and secondary thinning is serious are solved.
Optionally, the thinning region includes a first thinning region and a second thinning region, the first thinning region extends from the middle of the upper bearing shell body to the start of the second thinning region, and the second thinning region extends from the end of the first thinning region to the end of the thinning region, wherein the following relationship is satisfied:
W1-W2＝0.015(mm)
W2-W3＜0.010(mm)
in the above formula, W1 is the wall thickness of the upper bushing body at the initial position of the first thinning area, W2 is the wall thickness of the upper bushing body at the end position of the first thinning area, and W3 is the wall thickness of the upper bushing body at the end of the second thinning area.
Therefore, the thinning area is divided into a first thinning area and a second thinning area, the wall thickness W1 of the upper bearing shell body at the initial position of the first thinning area, the wall thickness W2 of the upper bearing shell body at the tail end of the first thinning area and the wall thickness W3 of the upper bearing shell body at the tail end of the second thinning area are introduced, and the upper bearing shell body is restrained through the relation among W1, W2 and W3, so that the thickness change range of the upper bearing shell body in the thinning area is controlled, and the wall thickness change of the upper bearing shell body in the thinning area is ensured to be stable.
Optionally, the degree of the central angle α between the starting position of the first thinning-out zone and the end position of the first thinning-out zone is 70 ° to 75 °.
Optionally, the degree of the central angle β between the starting position of the second thinning-out zone and the end position of the thinning-out zone is 15 ° to 20 °.
Optionally, the thickness M of the upper bushing body at x of the first thinning zonexThe following formula is satisfied:
Mx＝aθx+b
in the above formula, θxThe central angle between the middle part of the upper bearing bush body and the x position of the first thinning area is a degree, and a and b are constants.
Optionally, the thickness M of the upper bushing body at y of the second thinning zoneyThe following formula is satisfied:
in the above formula, θyThe central angle between the middle part of the upper bearing bush body and the y position of the second thinning area is a degree, and e and f are constants.
Thus, at a first thinning zone of greater extent and near the middle of the upper shoe body, the thickness M of the upper shoe body at x of the first thinning zonexAnd thetaxThe relation between the two is a linear function, so that the processing difficulty is reduced. In a second thinning zone of smaller extent and close to the shoe mouth of the upper shoe body, the thickness M of the upper shoe body at y of the second thinning zoneyAnd thetayThe relation between the first thinning area and the second thinning area is a quadratic function, so that the transition between the first thinning area and the second thinning area is smoother, an oil film and a bearing area of the bearing bush are more continuous, and the lubrication of the bearing bush is facilitated.
Optionally, a is-0.0001 and b is 1.981.
Optionally, said e ═ 2.04 × 10-6Said f＝1.981。
The utility model also provides a connecting rod axle bush, including connecting rod lower bearing bush and the aforesaid arbitrary connecting rod upper bearing bush.
The utility model also provides an engine includes above-mentioned connecting rod axle bush at least.
The utility model provides a connecting rod upper bearing shell, connecting rod axle bush and engine, wherein, the connecting rod upper bearing shell is through including the upper bearing shell body, and the inboard surface both sides of upper bearing shell body are equipped with two regions of thinning of symmetry, and the upper bearing shell body reduces from the middle part of upper bearing shell body to both sides at the wall thickness in thinning region gradually. The one-time thinning area in the prior art is eliminated, the thinning area with the thickness gradually reduced from the middle to two sides is adopted, the gap between the thinning area and the crankshaft is reduced, the thinning area can be better attached to the shaft diameter, the range of the bearing area of the bearing bush is enlarged, the specific pressure of the bearing bush is reduced, and the fatigue risk of the bearing bush is reduced. The problem of on the current connecting rod bearing bush once reduce the area and the clearance of bent axle big and be difficult to bear the weight of the bearing bush that leads to with the laminating of shaft diameter and limit in the area of reducing of secondary, cause the bearing bush to compare highly, bearing bush fatigue risk is high is solved. And the change of the wall thickness of the upper bearing shell body in the thinning area is more gradual, the thickness mutation of the thinning area is eliminated, and the oil film is more continuous, so that the problems that the thickness mutation of the transition positions of the two thinning areas is discontinuous, and the abrasion of the transition positions of primary thinning and secondary thinning is serious are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of thinning of a bushing on a connecting rod in the prior art;
fig. 2 is a schematic diagram of thinning a connecting rod upper bearing shell according to an embodiment of the present invention;
fig. 3 is a schematic view of a bearing shell on a connecting rod according to an embodiment of the present invention;
FIG. 4 is a line graph showing the thickness of a bearing bush on a connecting rod according to the prior art as a function of the angle from the middle of the bearing bush to the bush opening;
fig. 5 is a line graph showing the thickness of the bearing bush on the connecting rod varying with the angle from the middle of the bearing bush to the bush opening.
Description of reference numerals:
10-connecting rod upper bearing shell body;
20-a secondary thinning zone;
30-primary thinning zone;
40-a first thinning zone;
50-second thinning zone.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are embodiments of a unit of the present invention, not embodiments of a whole unit. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
FIG. 1 is a schematic view of a prior art upper bushing for a connecting rod; fig. 2 is a schematic view of a bearing shell on a connecting rod according to an embodiment of the present invention; fig. 3 is a schematic view of a bearing shell on a connecting rod according to an embodiment of the present invention; FIG. 4 is a line graph showing the thickness of a bearing bush on a connecting rod according to the prior art as a function of the angle from the middle of the bearing bush to the bush opening; fig. 5 is a line graph showing the thickness of the bearing bush on the connecting rod varying with the angle from the middle of the bearing bush to the bush opening.
In this embodiment, referring to fig. 2 and 3, the upper bushing of the connecting rod includes an upper bushing body, two symmetrical thinning regions are disposed on two sides of the inner side surface of the upper bushing body, and the wall thickness of the upper bushing body in the thinning regions is gradually reduced from the middle of the upper bushing body to two sides.
The connecting rod upper bearing bush provided by the embodiment comprises an upper bearing bush body, two symmetrical thinning areas are arranged on two sides of the inner side surface of the upper bearing bush body, and the wall thickness of the upper bearing bush body in the thinning areas is gradually reduced from the middle of the upper bearing bush body to two sides. The primary thinning area 30 in the prior art is omitted, the thinning area with the thickness gradually reduced from the middle to two sides is adopted, the gap between the thinning area and the crankshaft is reduced, the thinning area and the shaft diameter can be better attached, and the range of a bearing area of the bearing bush is enlarged, so that the specific pressure of the bearing bush is reduced, and the fatigue risk of the bearing bush is reduced. The problem of on the existing connecting rod bearing bush the bearing bush bear the weight of and limit in secondary area of thinning 20 that the clearance of the first area of thinning 30 and bent axle of being difficult to and the shaft diameter laminating leads to, cause the bearing bush specific pressure height, bearing bush fatigue risk is high is solved. And the change of the wall thickness of the upper bearing shell body in the thinning area is more gradual, the thickness mutation of the thinning area is eliminated, and the oil film is more continuous, so that the problems that the thickness mutation of the transition positions of the two thinning areas is discontinuous, and the abrasion of the transition positions of primary thinning and secondary thinning is serious are solved.
In this embodiment, referring to fig. 2 and 3, the thinning region includes a first thinning region 40 and a second thinning region 50, the first thinning region 40 extends from the middle of the upper bearing shell body to the beginning of the second thinning region 50, and the second thinning region 50 extends from the end of the first thinning region 40 to the end of the thinning region, wherein the following relationships are satisfied:
W1-W2＝0.015(mm)
W2-W3＜0.010(mm)
in the above formula, W1 is the wall thickness of the upper bushing body at the start position of the first thinning section 40, W2 is the wall thickness of the upper bushing body at the end position of the first thinning section 40, and W3 is the wall thickness of the upper bushing body at the end of the second thinning section 50.
In this way, the thinning region is divided into the first thinning region 40 and the second thinning region 50, the wall thickness W1 of the upper bearing shell body at the initial position of the first thinning region 40, the wall thickness W2 of the upper bearing shell body at the tail end of the first thinning region 40 and the wall thickness W3 of the upper bearing shell body at the tail end of the second thinning region 50 are introduced, and the relation among W1, W2 and W3 is used for restraining, so that the thickness variation range of the upper bearing shell body in the thinning region is controlled, and the wall thickness variation of the upper bearing shell body in the thinning region is ensured to be smooth.
In the present embodiment, referring to fig. 2 and 3, the central angle α between the start position of the first thinning-out section 40 and the end position of the first thinning-out section 40 is 70 ° to 75 °.
In the present embodiment, referring to fig. 2 and 3, the central angle β between the start position of the second thinning-out section 50 and the end position of the thinning-out section is 15 ° to 20 °.
Wherein, in the present embodiment, the thickness M of the upper bearing shell body at the x position of the first thinning area 40xThe following formula is satisfied:
Mx＝aθx+b
in the above formula, θxThe central angle between the middle of the upper bearing shell body and the x of the first thinning area 40 is a, b is constant.
Optionally, the thickness M of the upper bushing body at y of the second thinned region 50yThe following formula is satisfied:
in the above formula, θyThe central angle between the middle of the upper bearing shell body and the y position of the second thinning area 50 is a number of degrees, and e and f are constants.
Thus, at the first thinning zone 40, which is relatively extensive and close to the middle of the upper shoe body, the thickness M of the upper shoe body at x of the first thinning zone 40xAnd thetaxThe relation between the two is a linear function, so that the processing difficulty is reduced. At a second thinning zone 50 of lesser extent and close to the shoe mouth of the upper shoe body, the thickness M of the upper shoe body at y of the second thinning zone 50yAnd thetayThe relationship between the two areas is a quadratic function, so that the transition between the first thinning area 40 and the second thinning area 50 is smoother, and the oil film and the bearing area of the bearing bush are more continuous, which is beneficial to the lubrication of the bearing bush.
In this embodiment, a is — 0.0001, and b is 1.981.
In this example, e is-2.04 × 10-6，f＝1.981。
The embodiment also provides a connecting rod bearing shell which comprises a connecting rod lower bearing shell and any one connecting rod upper bearing shell.
The embodiment also provides an engine, which at least comprises the connecting rod bearing bush.
In the prior art, referring to fig. 1, the thickness reduction of the inner bearing shell is generally referred to as a primary reduction from the position of the shell opening of the upper bearing shell body 10 of the connecting rod along a certain distance of the running surface, and corresponds to a primary reduction area 30. Starting from the middle position of the connecting rod upper bearing bush body 10, the thickness of the bearing bush wall is gradually reduced along the running surfaces at two sides to be called secondary reduction, and the secondary reduction area 20 is correspondingly formed, and the formula is as follows:
thickness M of the upper bushing body at x' of the secondary thinning-out zone 20x′Comprises the following steps: mx′＝aθx′+b
Thickness M of the upper shell body at y' of the primary thinning-out zone 30y′Comprises the following steps: my′＝cθy′+d
In the above formula, θx′Is the central angle number theta between the middle part of the upper bearing shell body and the x' position of the primary thinning area 30y′A, b, c, d are constants for the central angle between the middle of the upper bushing body and y' of the second thinning zone 50.
In the prior art, the relationship between the bearing thickness and the angle of the primary thinning-out area 30 and the secondary thinning-out area 20 is a linear function, so that the transition area of the primary thinning-out area 30 and the secondary thinning-out area 20 has abrupt change.
In the embodiment, the relationship between the bearing thickness and the angle of the first thinning-out region 40 and the second thinning-out region 50 is a linear function, but the relationship between the bearing thickness and the angle of the second thinning-out region 50 is a quadratic function, so that the transition between the first thinning-out region 40 and the second thinning-out region 50 is more gradual.
For example, in this embodiment, let a be-0.0001, b be 1.981, c be-0.0014, d be 2.0655, and e be-2.04 × 10-6，f＝1.981，α＝α′＝70°，β＝β′＝20°。
Introducing each parameter into a calculation formula in the prior art, and drawing a calculation result into a graph 4; the parameters are introduced into the calculation formula of the embodiment, and the calculation result can be plotted as fig. 5.
As can be seen from fig. 4 and 5, the relationship between the thickness of the bearing bush and the angle change is consistent in the α section and the α ' section, the abrupt change occurs in the thickness of the bearing bush at the transition position between the α ' section and the β ' section, and the transition position between the α section and the β section is relatively gentle.
Thus, the transition between the first and second thinning zones 40, 50 is smoother, making the oil film and bearing pad bearing zones more continuous, facilitating the lubrication of the bearing pads. And the transition position between the first thinning area and the second thinning area does not generate mutation, so that the bearing bush abrasion caused by mutation is avoided.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, which are used to indicate the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, and do not indicate or imply that the position or element referred to must have a particular orientation, be of particular construction and operation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a connecting rod upper bearing shell, includes the upper bearing shell body, the inboard surface both sides of upper bearing shell body are equipped with two zones of thinning of symmetry, its characterized in that: the wall thickness of the upper bearing shell body in the thinning area is gradually reduced from the middle of the upper bearing shell body to two sides.
2. The upper bearing shell for a connecting rod of claim 1, wherein: the thinning zone comprises a first thinning zone and a second thinning zone, the first thinning zone extends from the middle of the upper bearing shell body to the starting point of the second thinning zone, the second thinning zone extends from the tail end of the first thinning zone to the tail end of the thinning zone, wherein the following relations are satisfied:
W1-W2＝0.015(mm) ，
W2-W3＜0.010(mm)
in the above formula, W1 is the wall thickness of the upper bushing body at the initial position of the first thinning area, W2 is the wall thickness of the upper bushing body at the end position of the first thinning area, and W3 is the wall thickness of the upper bushing body at the end of the second thinning area.
3. The upper bearing shell for a connecting rod of claim 2, wherein: the degree of the central angle alpha between the starting position of the first thinning-out zone and the end position of the first thinning-out zone is 70-75 deg.
4. The upper bearing shell for a connecting rod of claim 2, wherein: the degree of the central angle beta between the starting position of the second thinning-out zone and the end position of the thinning-out zone is 15-20 deg.
5. A bearing shell on a connecting rod according to any of claims 2 to 4, wherein: a thickness M of the upper bushing body at x of the first thinning zonexThe following formula is satisfied:
Mx＝aθx+b
in the above formula, θxThe central angle between the middle part of the upper bearing bush body and the x position of the first thinning area is a degree, and a and b are constants.
6. A bearing shell on a connecting rod according to any of claims 2 to 4, wherein: a thickness M of the upper bushing body at y of the second thinning-out regionyThe following formula is satisfied:
in the above formula, θyThe central angle between the middle part of the upper bearing bush body and the y position of the second thinning area is a degree, and e and f are constants.
7. The upper bearing shell for a connecting rod of claim 5, wherein: the a is-0.0001, and the b is 1.981.
8. The upper bearing shell for a connecting rod of claim 6, wherein: said e ═ 2.04X 10-6And f is 1.981.
9. A connecting rod bearing shell is characterized in that: comprising a connecting rod lower shell and a connecting rod upper shell according to any of the preceding claims 1-8.
10. An engine, characterized in that: comprising at least a bearing shell for a connecting rod according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022759500.7U CN214007761U (en) | 2020-11-25 | 2020-11-25 | Connecting rod upper bearing bush, connecting rod bearing bush and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022759500.7U CN214007761U (en) | 2020-11-25 | 2020-11-25 | Connecting rod upper bearing bush, connecting rod bearing bush and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214007761U true CN214007761U (en) | 2021-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022759500.7U Active CN214007761U (en) | 2020-11-25 | 2020-11-25 | Connecting rod upper bearing bush, connecting rod bearing bush and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214007761U (en) |
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2020
- 2020-11-25 CN CN202022759500.7U patent/CN214007761U/en active Active
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