CN219911475U - Crankshaft and plunger pump - Google Patents

Abstract

The utility model belongs to the technical field of crankshaft design, and particularly relates to a crankshaft and a plunger pump. The crankshaft comprises a plurality of main journals arranged at intervals, connecting rod journals are arranged between two adjacent main journals, the crankshaft is provided with oil inlets, first oil ways are arranged in each connecting rod journal, each first oil way is provided with a first oil supply end, at least one first oil way is provided with a second oil supply end which is arranged at intervals with the first oil supply ends, one of the first oil supply ends and the second oil supply ends is an upper bearing bush oil supply end, the other is a lower bearing bush oil supply end, the first oil supply ends and the second oil supply ends are all extended to the outer peripheral surface of the connecting rod journals, the two adjacent first oil ways are communicated, and the oil inlets are communicated with the first oil ways. The crankshaft provided by the utility model can lubricate the lower bearing bush without arranging an oil groove on the lower bearing bush, so that the integrity of an oil film formed at the lower bearing bush can be ensured, and the problem that the lower bearing bush is easy to damage is solved.

Description

Crankshaft and plunger pump

Technical Field

The utility model belongs to the technical field of crankshaft design, and particularly relates to a crankshaft and a plunger pump.

Background

The crank-link mechanism can convert the rotary motion of the prime motor into reciprocating linear motion, so as to realize pumping operation. The crank connecting rod mechanism comprises a crankshaft and a cross head connected with the crankshaft, and the connecting rod bearing bush and the cross head bearing bush are important parts for connecting the crankshaft and the connecting rod, wherein the connecting rod bearing bush comprises an upper bearing bush and a lower bearing bush, and the upper bearing bush and the lower bearing bush need to be lubricated in the operation process of the crank connecting rod mechanism so as to form an oil film and reduce friction, thereby improving the bearing capacity of the connecting rod bearing bush and ensuring that the crank connecting rod mechanism can stably operate.

In the related art, the crankshaft comprises a connecting rod journal, the crankshaft is provided with a lubricating oil duct, the outer peripheral surface of the connecting rod journal is provided with a lubricating port, the lubricating port is communicated with the lubricating oil duct, the inner peripheral surfaces of the upper bearing bush and the lower bearing bush are respectively provided with an arc-shaped oil groove, the upper bearing bush is communicated with the arc-shaped oil grooves of the lower bearing bush, and the lubricating port is opposite to one of the two arc-shaped oil grooves, so that the upper bearing bush and the lower bearing bush can be lubricated. But in the motion process of the crank connecting rod mechanism, the lower bearing bush is a bearing bush, the acting force born by the lower bearing bush is large, and an arc-shaped oil groove formed in the lower bearing bush can damage the integrity of an oil film formed at the lower bearing bush, so that the bearing capacity of the lower bearing bush can be reduced, and the lower bearing bush can be damaged.

Disclosure of Invention

The embodiment of the utility model aims to provide a crankshaft and a plunger pump, and an oil groove is not required to be formed in a lower bearing bush, so that the problem that the lower bearing bush is easy to damage can be solved.

In order to solve the technical problems, the utility model is realized as follows:

in a first aspect, an embodiment of the present utility model provides a crankshaft, including a plurality of main journals disposed at intervals, connecting rod journals are disposed between two adjacent main journals, the crankshaft has an oil inlet, each connecting rod journal is internally provided with a first oil path, each first oil path has a first oil supply end, at least one first oil path has a second oil supply end disposed at intervals with the first oil supply end, one of the first oil supply end and the second oil supply end is an upper bearing bush oil supply end, the other is a lower bearing bush oil supply end, the first oil supply end and the second oil supply end extend to an outer peripheral surface of the connecting rod journals, the two adjacent first oil paths are communicated, and the oil inlet is communicated with the first oil path.

In a second aspect, an embodiment of the present utility model provides a plunger pump, including a crankshaft as described above.

In an embodiment of the utility model, the crankshaft comprises main journals and connecting rod journals, each connecting rod journal is provided with a first oil way, the first oil way is provided with a first oil supply end, at least one first oil way is provided with a second oil supply end, one of the first oil supply end and the second oil supply end can supply oil for the upper bearing bush, the other one can supply oil for the lower bearing bush, that is, when the upper bearing bush and the lower bearing bush are assembled on the connecting rod journals provided with the first oil supply end and the second oil supply end, the lubricating oil flowing out of the first oil supply end can lubricate the upper bearing bush or the lower bearing bush, and the lubricating oil flowing out of the second oil supply end can lubricate the lower bearing bush or the upper bearing bush. Therefore, the utility model can lubricate the lower bearing bush without arranging an oil groove on the lower bearing bush, thereby ensuring the integrity of an oil film formed at the lower bearing bush and further solving the problem that the lower bearing bush is easy to damage.

Drawings

FIG. 1 is a schematic view of a crankshaft according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 in accordance with the present utility model;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1 in accordance with the present utility model;

FIG. 4 is an exploded view of a part of the structure of a plunger pump according to an embodiment of the present utility model;

FIG. 5 is a partial cross-sectional view of a plunger pump when a crankshaft is rotated to a first position in accordance with an embodiment of the present utility model;

FIG. 6 is a partial cross-sectional view of a plunger pump when a crankshaft is rotated to a front dead center position in accordance with an embodiment of the present utility model;

FIG. 7 is a partial cross-sectional view of a plunger pump when the crankshaft is rotated to a second position in accordance with an embodiment of the present utility model;

FIG. 8 is a partial cross-sectional view of a plunger pump when the crankshaft is rotated to a rear dead center position in accordance with an embodiment of the present utility model.

Reference numerals illustrate:

100-main journal, 110-second oil way, 111-bearing oil supply end, 200-connecting rod journal, 210-first oil way, 211-first oil supply end, 212-second oil supply end, 300-oil inlet, 310-first oil inlet, 320-second oil inlet, 400-connecting rod, 410-first end, 411-second oil guiding groove, 420-second end, 500-upper bearing bush, 510-first oil guiding groove, 520-first oil guiding hole, 600-lower bearing bush, 710-cross head, 720-rotating shaft, 730-cross head bearing bush, 740-shaft sleeve, 741-fourth oil guiding groove, 810-cross head bearing bush oil supply end, 820-oil way, 830-third oil guiding groove, 840-second oil guiding hole, 910-connecting oil way, 920-rotating bearing.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that some, but not all embodiments of the utility model are described. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present utility model may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

The crankshaft and the plunger pump provided by the embodiment of the utility model are described in detail through specific embodiments and application scenes thereof by combining the accompanying drawings.

As shown in fig. 1 to 3, an embodiment of the present utility model discloses a crankshaft, which includes a plurality of main journals 100 arranged at intervals, connecting rod journals 200 are disposed between two adjacent main journals 100, and the crankshaft has an oil inlet 300. Specifically, the axis of the main journal 100 and the axis of the connecting rod journal 200 are not collinear, the axes of the two main journals 100 may be parallel to each other, the main journal 100 may be directly connected to the connecting rod journal 200, or may be indirectly connected to the connecting rod journal 200 through an intermediate member, where the intermediate member may be a crank arm, in this case, the connecting rod journal 200 is disposed between two adjacent crank arms, and the crank is formed by the two adjacent crank arms and one connecting rod journal 200, and the crank is disposed between the two adjacent main journals 100.

Each connecting rod journal 200 is internally provided with a first oil path 210, each first oil path 210 is provided with a first oil supply end 211, at least one first oil path 210 is provided with a second oil supply end 212 which is arranged at intervals with the first oil supply end 211, one of the first oil supply end 211 and the second oil supply end 212 is an upper bearing bush oil supply end, the other is a lower bearing bush oil supply end, the first oil supply end 211 and the second oil supply end 212 extend to the peripheral surface of the connecting rod journal 200, two adjacent first oil paths 210 are communicated, and an oil inlet 300 is communicated with the first oil path 210.

In the embodiment of the present utility model, the crankshaft includes the main journal 100 and the connecting rod journals 200, each connecting rod journal 200 is provided with a first oil path 210, the first oil path 210 has a first oil supply end 211, and at least one first oil path 210 has a second oil supply end 212, one of the first oil supply end 211 and the second oil supply end 212 may supply oil to the upper bearing shell 500, and the other may supply oil to the lower bearing shell 600, that is, when the upper bearing shell 500 and the lower bearing shell 600 are assembled on the connecting rod journal 200 provided with the first oil supply end 211 and the second oil supply end 212, the lubricating oil flowing out from the first oil supply end 211 may lubricate the upper bearing shell 500 or the lower bearing shell 600, and the lubricating oil flowing out from the second oil supply end 212 may lubricate the lower bearing shell 600 or the upper bearing shell 500. Therefore, the utility model can lubricate the lower bearing bush 600 without arranging an oil groove on the lower bearing bush 600, thereby ensuring the integrity of an oil film formed at the lower bearing bush 600 and further solving the problem that the lower bearing bush 600 is easy to be damaged.

It should be noted that, when a portion of the first oil path 210 in the connecting rod journal 200 has only the first oil supply end 211, the first oil supply end 211 may be opposite to one of the upper bearing shell 500 or the lower bearing shell 600, where an arc-shaped oil groove is disposed on a surface of the upper bearing shell 500 facing the connecting rod journal 200 and a surface of the lower bearing shell 600 facing the connecting rod journal 200, and the two arc-shaped oil grooves are in communication, so that the upper bearing shell 500 and the lower bearing shell 600 can be lubricated by the first oil supply end 211. To prevent all of the lower bearing shells 600 from being damaged, all of the first oil passages 210 may be provided with both the first oil supply end 211 and the second oil supply end 212.

The outer portion of the main journal 100 is sleeved with a rotating bearing 920 so that the main journal 100 is rotatably disposed in the crankcase, and it is generally necessary to lubricate the rotating bearing 920 to reduce the rotating friction of the rotating bearing 920 and reduce the heat generated during friction. In an alternative embodiment, each main journal 100 is provided with a second oil passage 110, and the first oil passage 210 communicates with an adjacent second oil passage 110, that is, the first oil passage 210 communicates with an adjacent second oil passage 110, and at least one second oil passage 110 has a bearing oil supply end 111, and the bearing oil supply end 111 extends to the outer peripheral surface of the main journal 100. Optionally, a connecting oil path 910 is further provided on the crankshaft, and the adjacent first oil path 210 and second oil path 110 are communicated through the connecting oil path 910. The connecting oil passage 910 may be provided in the main journal 100 and the connecting rod journal 200.

In this embodiment, the second oil path 110 on the main journal 100 has a bearing oil supply end 111, the bearing oil supply end 111 may be opposite to the rolling bearing 920, the second oil path 110 may be communicated with the oil inlet 300 through the first oil path 210, and the lubricating oil introduced from the oil inlet 300 may flow out through the bearing oil supply end 111, so as to lubricate the rolling bearing 920. It can be seen that this embodiment passes through the same oil supply circuit, namely: the oil supply circuit communicating with the oil inlet 300 can lubricate the lower bearing bush 600, the upper bearing bush 500 and the rotating bearing 920 at the same time, so that the pipe structure of the oil supply circuit can be simplified.

Of course, a lubrication oil path may be provided on the crankcase, and a lubrication port of the lubrication oil path is opposite to the rolling bearing 920, so as to lubricate the rolling bearing 920, and the present utility model is not limited to a lubrication manner of the rolling bearing 920.

Alternatively, the number of the oil inlets 300 may be one, and the oil inlets 300 are located at one end of the crankshaft, where one end of the crankshaft refers to any end of the crankshaft in the length direction thereof, and because the length of the crankshaft is long, oil pressure loss is large during the process of flowing the lubricating oil entering from the oil inlet 300 located at one end of the crankshaft to the other end of the crankshaft, so that the oil pressure in the first oil path 210 in the connecting rod journal 200 further from the oil inlets 300 is low, and at this time, the lubricating oil in the first oil path 210 may not flow out from the first oil supply end 211, or may not flow out from the first oil supply end 211 and the second oil supply end 212, which may cause the lubricating oil entering from the oil inlets 300 to not lubricate the upper bearing bush 500 and the lower bearing bush 600 on the connecting rod journal 200 further from the oil inlets 300.

In an alternative embodiment, the oil inlet 300 includes a first oil inlet 310 and a second oil inlet 320, and the first oil inlet 310 and the second oil inlet 320 are disposed at two ends of the crankshaft, respectively, where the two ends of the crankshaft refer to two ends of the crankshaft in a length direction thereof. In this embodiment, the oil inlet 300 includes a first oil inlet 310 and a second oil inlet 320 respectively located at two ends of the crankshaft, the first oil path 210 in the connecting rod journal 200 farther from the first oil inlet 310 may be supplied with oil from the second oil inlet 320, and the second oil inlet 320 is closer to the connecting rod journal 200, so that the oil pressure is larger when the lubricating oil entering from the second oil inlet 320 reaches the first oil path 210 in the connecting rod journal 200, and the lubricating oil may smoothly flow out from the first oil supply end 211 or may smoothly flow out from the first oil supply end 211 and the second oil supply end 212.

Alternatively, the oil inlet 300 may be disposed on the outer peripheral surface of the main journal 100 at the end of the crankshaft, where the oil inlet 300 may be in communication with the oil supply circuit, but after the oil inlet 300 is connected to the oil supply circuit, the oil supply circuit occupies the installation position of the rolling bearing 920, so that the outer peripheral surface of the main journal 100 cannot be further provided with the rolling bearing 920, and the main journal 100 is supported on the crankcase by the rolling bearing 920, so that the disposition of the oil inlet 300 on the outer peripheral surface of the main journal 100 reduces the supporting point of the crankcase on the crankshaft. In an alternative embodiment, the oil inlet 300 is disposed on the end face of the main journal 100 at the end of the crankshaft, so that the installation position on the outer peripheral surface of the main journal 100 is not occupied by the oil supply circuit, and thus the outer peripheral surface thereof may be provided with the rotating bearing 920, thereby solving the problem of less supporting points of the crankcase to the crankshaft.

Alternatively, the axis of the first oil path 210 may be curved or folded, and the path of the first oil path 210 is longer, so that the pressure loss of the lubricating oil passing through the first oil path 210 is larger, which may reduce the lubricating effect of the lubricating oil on the upper bearing shell 500 and the lower bearing shell 600. In an alternative embodiment, the axis of the first oil passage 210 is a straight line. In this embodiment, the axis of the first oil path 210 is a straight line, and compared with the previous embodiment, the path of the first oil path 210 is shorter in this embodiment, so that the pressure loss of the lubricating oil passing through the first oil path 210 is smaller, and the lubricating effect of the lubricating oil on the upper bearing bush 500 and the lower bearing bush 600 can be improved.

As shown in fig. 4 to 8, the embodiment of the present utility model also discloses a plunger pump, including the crankshaft according to any one of the above embodiments. The crankshaft adopting the embodiment of the utility model can lubricate the lower bearing bush 600 without arranging an oil groove on the lower bearing bush 600, thereby ensuring the integrity of an oil film formed at the position of the lower bearing bush 600 and further solving the problem that the lower bearing bush 600 is easy to damage.

In an alternative embodiment, the plunger pump further includes a plurality of spaced apart links 400, the links 400 having a first end 410 and a second end 420. Alternatively, the first end 410 may be a large head end and the second end 420 may be a small head end.

Each first end 410 is rotatably sleeved outside each connecting rod journal 200, that is, at least a portion of each connecting rod journal 200 is located in the inner hole of each first end 410, an upper bearing bush 500 and a lower bearing bush 600 are further disposed between each first end 410 and each connecting rod journal 200, and each lower bearing bush 600 is located between each second end 420 and each upper bearing bush 500. Specifically, the inner hole of the first end 410 is provided with an upper bearing bush 500 and a lower bearing bush 600, and the upper bearing bush 500 and the lower bearing bush 600 are provided on the outer circumferential surface of the connecting rod journal 200; in addition, the lower bearing shell 600 is closer to the second end 420 than the upper bearing shell 500, and as an example, in the position shown in fig. 5, there is lubricant in the inner cavity located at the left side of the cross head 710, and there is no lubricant in the inner cavity located at the right side of the cross head 710, so that during the process that the connecting rod 400 pushes the cross head 710 to slide leftwards, the lubricant in the inner cavity located at the left side of the cross head 710 applies a force to the cross head 710, so that the connecting rod 400 applies a force to the connecting rod 400, and thus the lower bearing shell 600; while the connecting rod 400 pulls the crosshead 710 to slide rightward, the upper bearing bush 500 does not receive the force exerted by the lubricating oil because the lubricating oil does not exist in the inner cavity located on the right side of the crosshead 710. It can be seen that the lower bearing shell 600 is subjected to a greater force than the upper bearing shell 500, and therefore the lower bearing shell 600 is a load bearing shell.

One of the first oil supply end 211 and the second oil supply end 212 faces the upper bearing shell 500, the other faces the lower bearing shell 600, and a face of the lower bearing shell 600 facing the connecting rod journal 200 is a flat face, that is, a face of the lower bearing shell 600 facing the connecting rod journal 200 has no groove, boss or other structure. In this embodiment, the lubricating oil flowing out from the first oil supply end 211 can lubricate the upper bearing bush 500 or the lower bearing bush 600, the lubricating oil flowing out from the second oil supply end 212 can lubricate the lower bearing bush 600 or the upper bearing bush 500, and one surface of the lower bearing bush 600 facing the connecting rod journal 200 is a flat surface, so that the integrity of an oil film formed at the lower bearing bush 600 can be ensured, and the problem that the lower bearing bush 600 is easily damaged is solved.

The first oil feed end 211 faces the upper bearing shell 500 and the second oil feed end 212 faces the lower bearing shell 600, and the crankshaft is rotatable between a front dead center position and a rear dead center position. Specifically, the front dead center position is the position where the crankshaft is when the crosshead 710 moves to the position furthest away from the crankshaft, i.e.: the position shown in fig. 6; the rear dead center position is the position where the crankshaft is when the crosshead 710 moves to the position closest to the crankshaft, i.e.: fig. 8 shows the position.

Taking the position shown in fig. 6 as an example, when the crankshaft rotates to the front dead center position, the left end of the connecting rod journal 200 contacts the lower bushing 600, and if the vertical line between the second oil supply end 212 and the central axis of the connecting rod journal 200 is aligned with the first direction, the first direction is the direction extending from the first end 410 to the second end 420, and at this time, the second oil supply end 212 is located at the left end of the connecting rod journal 200, so that the second oil supply end 212 is just blocked by the lower bushing 600, which can prevent the lubricating oil from flowing out from the second oil supply end 212, and thus cannot lubricate the lower bushing 600. Thus, in an alternative embodiment, the perpendicular line between the second oil feed end 212 and the central axis of the connecting rod journal 200 is angled with respect to a first direction extending from the first end 410 to the second end 420 as the crankshaft rotates to a front dead center position. In this embodiment, when the crankshaft rotates to the front dead center position, an angle is formed between the vertical line between the second oil supply end 212 and the connecting rod journal 200 and the first direction, so that an oil supply gap is formed between the second oil supply end 212 and the lower bearing bush 600, and lubricating oil can flow out of the oil supply gap, so that the second oil supply end 212 is prevented from being blocked by the lower bearing bush 600. Alternatively, the angle between the perpendicular line between the second oil feed end 212 and the connecting rod journal 200 and the first direction may be 20 ° to 70 °.

It should be noted that, the perpendicular line between the second oil supply end 212 and the connecting rod journal 200 is parallel to the x line in fig. 2, and the first direction is parallel to the y line in fig. 2.

In an alternative embodiment, the plunger pump further includes a plurality of spaced-apart crossheads 710, the crosshead 710 is provided with a rotation shaft 720, each second end 420 is rotatably sleeved outside the rotation shaft 720, that is, at least a portion of the rotation shaft 720 is located in an inner hole of the second end 420, a crosshead bearing bush 730 is disposed between the crosshead 710 and the second end 420, a first oil guiding groove 510 is disposed between the upper bearing bush 500 and the connecting rod journal 200, the first oil supply end 211 is communicated with the first oil guiding groove 510, and a second oil guiding groove 411 is disposed on a surface of the inner hole of the first end 410 facing the connecting rod journal 200. Alternatively, the first oil guide groove 510 may be an arc-shaped groove, which may be provided at the outer circumferential surface of the connecting rod journal 200 or the inner circumferential surface of the upper bearing shell 500. Further, the first oil guiding groove 510 is provided at the inner circumferential surface of the upper bearing bush 500, and the first oil guiding groove 510 extends along the circumferential direction of the upper bearing bush 500, so that the problem that the structural strength of the connecting rod journal 200 is reduced by providing the first oil guiding groove 510 to the connecting rod journal 200 can be solved; the second oil guiding groove 411 may be an annular groove, and the second oil guiding groove 411 extends along a circumference of the inner hole of the first end 410.

The upper bearing bush 500 is provided with a first oil guide hole 520, the first oil guide groove 510 is communicated with the second oil guide groove 411 through the first oil guide hole 520, the plunger pump is further provided with a third oil path, the third oil path is communicated with the second oil guide groove 411, and the third oil path is provided with a cross-head bearing bush oil supply end 810, and the cross-head bearing bush oil supply end 810 is opposite to the cross-head bearing bush 730. In this embodiment, the lubricating oil flowing out from the first oil supply end 211 may flow to the third oil path through the first oil guiding groove 510, the first oil guiding hole 520 and the second oil guiding groove 411, and then may flow out from the crosshead bushing oil supply end 810, so as to lubricate the crosshead bushing 730. It can be seen that this embodiment passes through the same oil supply circuit, namely: the oil supply circuit communicating with the oil inlet 300 can lubricate the lower bearing bush 600, the upper bearing bush 500, the rotating bearing 920 and the cross-head bearing bush 730 at the same time, so that the pipe structure of the oil supply circuit can be simplified.

In an alternative embodiment, the third oil path includes an oil path 820, a third oil guiding groove 830 and a second oil guiding hole 840, the oil path 820 is disposed in the connecting rod 400, the third oil guiding groove 830 is disposed between the inner hole of the second end 420 and the rotating shaft 720, the second oil guiding hole 840 is disposed in the second end 420, the second oil guiding hole 840 has a cross-head bearing bush oil supply end 810, two ends of the oil path 820 are respectively communicated with the second oil guiding groove 411 and the third oil guiding groove 830, and the second oil guiding hole 840 is communicated with the third oil guiding groove 830. In this embodiment, the third oil path includes an oil passage 820, a third oil guiding groove 830 and a second oil guiding hole 840, the lubricating oil flowing out from the second oil guiding groove 411 can reach the third oil guiding groove 830 through the oil passage 820, and the second oil guiding hole 840 with the cross-head bush oil supply end 810 is further communicated with the third oil guiding groove 830, so that the lubricating oil can flow to the second oil guiding hole 840 through the third oil guiding groove 830, and further flow out from the cross-head bush oil supply end 810 to lubricate the cross-head bush 730; meanwhile, since the third oil guiding groove 830 is provided between the inner hole of the second end 420 and the rotating shaft 720, the rotating shaft 720 can be lubricated from the lubricating oil entering the third oil guiding groove 830. Alternatively, the third oil guide groove 830 may be provided on the inner hole of the second end 420, or may be provided on the outer circumferential surface of the rotation shaft 720. Of course, the third oil path may extend directly to the cross-head bush 730 through the solid portion of the second end 420 instead of through the inner bore of the second end 420.

Further, the plunger pump further comprises a shaft sleeve 740, the shaft sleeve 740 is sleeved outside the rotating shaft 720, so that the rotating shaft 720 can be prevented from being worn, the outer circumferential surface of the shaft sleeve 740 is provided with the third oil guiding groove 830, the inner circumferential surface of the shaft sleeve 740 is provided with the fourth oil guiding groove 741, and the third oil guiding groove 830 and the fourth oil guiding groove 741 can be communicated through the third oil guiding hole, so that the rotating shaft 720 is lubricated.

The foregoing embodiments of the present utility model mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in view of brevity of line text, no further description is provided herein. The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims (10)

1. A crankshaft is characterized by comprising a plurality of main journals (100) which are arranged at intervals, connecting rod journals (200) are arranged between two adjacent main journals (100), the crankshaft is provided with an oil inlet (300),

each connecting rod journal (200) is internally provided with a first oil way (210), each first oil way (210) is provided with a first oil supply end (211), at least one first oil way (210) is provided with a second oil supply end (212) which is arranged at intervals with the first oil supply end (211), one of the first oil supply end (211) and the second oil supply end (212) is an upper bearing bush oil supply end, the other is a lower bearing bush oil supply end, the first oil supply end (211) and the second oil supply end (212) are all extended to the outer peripheral surface of the connecting rod journal (200), two adjacent first oil ways (210) are communicated, and the oil inlet (300) is communicated with the first oil way (210).

2. A crankshaft according to claim 1, wherein each main journal (100) is provided with a second oil passage (110), the first oil passage (210) communicates with the adjacent second oil passages (110), at least one of the second oil passages (110) has a bearing oil supply end (111), and the bearing oil supply end (111) extends to the outer peripheral surface of the main journal (100).

3. The crankshaft according to claim 1, wherein the oil inlet (300) includes a first oil inlet (310) and a second oil inlet (320), the first oil inlet (310) and the second oil inlet (320) being disposed at two ends of the crankshaft, respectively.

4. The crankshaft according to claim 1, characterized in that the oil inlet (300) is provided on an end face of the main journal (100) at an end of the crankshaft.

5. The crankshaft according to claim 1, wherein the axis of the first oil passage (210) is a straight line.

6. A plunger pump comprising a crankshaft according to any one of claims 1 to 5.

7. The plunger pump of claim 6, further comprising a plurality of connecting rods (400) disposed at intervals, wherein each connecting rod (400) has a first end (410) and a second end (420), each first end (410) is rotatably sleeved outside each connecting rod journal (200), an upper bearing bush (500) and a lower bearing bush (600) are further disposed between each first end (410) and each connecting rod journal (200), each lower bearing bush (600) is disposed between each second end (420) and each upper bearing bush (500), one of the first oil supply end (211) and the second oil supply end (212) faces the upper bearing bush (500), the other one faces the lower bearing bush (600), and a face of each lower bearing bush (600) facing the connecting rod journal (200) is a flat face.

8. The plunger pump according to claim 7, wherein the first oil supply end (211) is directed towards the upper bearing bush (500), the second oil supply end (212) is directed towards the lower bearing bush (600), the crankshaft being rotatable between a front dead center position and a rear dead center position,

in the case of a rotation of the crankshaft to the front dead center position, an angle is formed between a perpendicular line between the second oil supply end (212) and the central axis of the connecting rod journal (200) and a first direction,

wherein the first direction is a direction extending from the first end (410) to the second end (420).

9. The plunger pump according to claim 7, further comprising a plurality of spaced-apart cross heads (710), wherein a rotation shaft (720) is provided on the cross heads (710), each of the second ends (420) is rotatably sleeved outside the rotation shaft (720), a cross head bearing bush (730) is provided between the cross heads (710) and the second ends (420),

the novel oil guide device is characterized in that a first oil guide groove (510) is formed between the upper bearing bush (500) and the connecting rod journal (200), a first oil supply end (211) is communicated with the first oil guide groove (510), a second oil guide groove (411) is formed in the inner hole of the first end (410) towards one face of the connecting rod journal (200), a first oil guide hole (520) is formed in the upper bearing bush (500), the first oil guide groove (510) and the second oil guide groove (411) are communicated through the first oil guide hole (520), a third oil way is further formed in the plunger pump and is communicated with the second oil guide groove (411), and the third oil way is provided with a cross-head bearing bush oil supply end (810), and the cross-head bearing bush oil supply end (810) is opposite to the cross-head bearing bush (730).

10. The plunger pump according to claim 9, wherein the third oil path includes an oil path (820), a third oil guiding groove (830) and a second oil guiding hole (840), the oil path (820) is provided in the connecting rod (400), the third oil guiding groove (830) is provided between an inner hole of the second end (420) and the rotating shaft (720), the second oil guiding hole (840) is provided in the second end (420), the second oil guiding hole (840) has the cross-head bearing bush oil supplying end (810), two ends of the oil path (820) are respectively communicated with the second oil guiding groove (411) and the third oil guiding groove (830), and the second oil guiding hole (840) is communicated with the third oil guiding groove (830).