CN212296647U - Piston, piston assembly and engine - Google Patents
Piston, piston assembly and engine Download PDFInfo
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- CN212296647U CN212296647U CN202020985800.4U CN202020985800U CN212296647U CN 212296647 U CN212296647 U CN 212296647U CN 202020985800 U CN202020985800 U CN 202020985800U CN 212296647 U CN212296647 U CN 212296647U
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- oil
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- annular cavity
- piston body
- connecting rod
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- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The utility model discloses a piston, a piston assembly and an engine, wherein the piston comprises a piston body, the piston body is provided with a matching cavity for mounting a piston pin and a connecting rod, the matching cavity comprises an annular cavity section arranged corresponding to a shaft sleeve, and the peripheral side wall of the piston body is provided with an oil groove; the piston body is also provided with an oil duct which is communicated with the oil groove and the annular cavity section, and the oil duct is used for guiding oil in the oil groove into the annular cavity section. In the utility model, the oil groove of the piston body is internally provided with the oil scraped from the inner wall of the engine cylinder, so that the lubricating oil is not required to be additionally input, and the piston has the advantages of simple structure and lower cost; the oil duct directly guides fluid to annular cavity segment department from oil groove department, reduces the loss that fluid produced at the circulation in-process, helps providing comparatively sufficient oil mass for piston pin and connecting rod shaft sleeve hole kinematic pair within a definite time, realizes good lubrication to avoid this department to produce the abnormal sound because of lubricated not enough.
Description
Technical Field
The utility model relates to an engine piston technical field, concretely relates to piston, piston assembly and engine.
Background
When the engine is in cold start and idling at low rotating speed, if insufficient lubricating oil is available between the piston pin and the connecting rod shaft sleeve hole kinematic pair, abnormal noise of the engine can be caused. In order to solve the problems, the existing piston pin and connecting rod shaft sleeve hole kinematic pair is generally lubricated in two ways of circulating oil mist in a crankcase or oil mist of a piston cooling nozzle, however, along with the continuous development of an engine, the power and the torque are continuously improved, the existing scheme of circulating oil mist in the crankcase is increasingly difficult to meet the requirement of the lubricating oil quantity between the piston pin and the connecting rod shaft sleeve hole, and the abnormal sound problem is not well solved; and adopt and increase piston cooling nozzle fuel injection quantity scheme, the cost is higher, consumes more engine consumption simultaneously, is unfavorable for popularizing and applying.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a piston, piston assembly and engine, aim at solving lubricated not enough and the problem that leads to the abnormal sound between traditional piston pin and connecting rod shaft sleeve hole kinematic pair.
In order to achieve the above object, the present invention provides a piston for an engine, the piston comprising a piston body, the piston body being provided with a matching cavity for mounting a piston pin and a connecting rod, the matching cavity comprising an annular cavity section corresponding to a shaft sleeve, the circumferential side wall of the piston body being provided with an oil groove;
the piston body is further provided with an oil duct communicated with the oil groove and the annular cavity section, and the oil duct is used for guiding oil in the oil groove to the annular cavity section.
Optionally, the oil passages include a first oil passage and a second oil passage which are sequentially communicated in a direction close to the annular cavity;
the first oil duct and the second oil duct are arranged in a crossed included angle.
Optionally, the piston body has a lower end for insertion of a connecting rod, and an upper end disposed opposite to the lower end;
the oil passage is gradually and obliquely arranged downwards in the direction close to the annular cavity section.
Optionally, the angle of inclination of the first oil passage is greater than the angle of inclination of the second oil passage.
Optionally, the oil passage is provided in plurality at intervals along the circumferential direction of the piston body.
Alternatively, the axes of any two of the oil passages in the plurality of oil passages are not arranged in line.
Optionally, the oil passage comprises an oil outlet section disposed adjacent to the annular cavity section;
the oil outlet section of each oil passage extends along the tangential direction of the annular cavity section at the position of the oil outlet section.
Optionally, the diameter of the oil passage is 2-4 mm.
Furthermore, in order to achieve the above object, the present invention also provides a piston assembly for an engine, comprising:
a piston as described above;
the connecting rod is arranged in the matching cavity and is provided with a small head end extending into the matching cavity and a large head end positioned outside the matching cavity, and the small head end of the connecting rod is provided with a mounting hole;
the piston pin is arranged in the mounting hole in a penetrating mode; and the number of the first and second groups,
and the shaft sleeve is arranged between the mounting hole and the piston pin.
In addition, in order to achieve the above object, the present invention also provides an engine including the piston assembly as described above.
In the technical scheme provided by the utility model, the oil groove of the piston body is internally provided with the oil scraped from the inner wall of the engine cylinder, so that the lubricating oil does not need to be additionally input, and the piston has the advantages of simple structure and lower cost; the oil duct directly guides fluid to annular cavity segment department from oil groove department, reduces the loss that fluid produced at the circulation in-process, helps providing comparatively sufficient oil mass for piston pin and connecting rod shaft sleeve hole kinematic pair within a definite time, realizes good lubrication to avoid this department to produce the abnormal sound because of lubricated not enough.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic longitudinal sectional view of an embodiment of a piston assembly provided by the present invention;
FIG. 2 is a schematic illustration of the oil gallery of FIG. 1 mated with an annular cavity segment;
FIG. 3 is an enlarged schematic view of the oil gallery of FIG. 1;
fig. 4 is an enlarged schematic view of a second embodiment of a piston assembly provided by the present invention at an oil passage.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Piston |
141 | |
| 1 | Piston |
142 | |
| 11 | |
14a | |
| 12 | |
2 | Connecting |
| 13 | |
3 | Piston |
| 14 | |
4 | Shaft sleeve |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
When the engine is in cold start and idling at low rotating speed, if insufficient lubricating oil is available between the piston pin and the connecting rod shaft sleeve hole kinematic pair, abnormal noise of the engine can be caused. In order to solve the problems, the existing piston pin and connecting rod shaft sleeve hole kinematic pair is generally lubricated in two ways of circulating oil mist in a crankcase or oil mist of a piston cooling nozzle, however, along with the continuous development of an engine, the power and the torque are continuously improved, the existing scheme of circulating oil mist in the crankcase is increasingly difficult to meet the requirement of the lubricating oil quantity between the piston pin and the connecting rod shaft sleeve hole, and the abnormal sound problem is not well solved; and adopt and increase piston cooling nozzle fuel injection quantity scheme, the cost is higher, consumes more engine consumption simultaneously, is unfavorable for popularizing and applying.
In view of this, the present invention provides an engine including a piston assembly disposed within an engine cylinder, and fig. 1-4 illustrate an embodiment of a piston assembly according to the present invention.
Referring to fig. 1, in the present design, the piston assembly 100 includes a piston, a connecting rod 2, a piston pin 3, and a shaft sleeve 4, wherein the piston includes a piston body 1, the piston body 1 is provided with a matching cavity 11 for mounting the piston pin 3 and the connecting rod 2, the matching cavity 11 includes an annular cavity section 12 corresponding to the shaft sleeve 4, and an oil groove 13 is formed on a peripheral side wall of the piston body 1; the piston body 1 is further provided with an oil duct 14 which is communicated with the oil groove 13 and the annular cavity section 12, and the oil duct 14 is used for guiding oil in the oil groove 13 into the annular cavity section 12. The connecting rod 2 is arranged in the matching cavity 11 and is provided with a small end extending into the matching cavity 11 and a large end positioned outside the matching cavity 11, and the small end of the connecting rod 2 is provided with a mounting hole; the piston pin 3 is arranged in the mounting hole in a penetrating way; the bushing 4 is provided between the mounting hole and the piston pin 3.
In the technical scheme provided by the utility model, the oil groove 13 of the piston body 1 is internally provided with the oil scraped from the inner wall of the engine cylinder, so that the lubricating oil is not required to be additionally input, and the piston has the advantages of simple structure and lower cost; the oil duct 14 directly guides oil from the oil groove 13 to the annular cavity section 12, so that loss of the oil in the circulation process is reduced, sufficient oil is provided for a hole kinematic pair of the piston pin 3 and the shaft sleeve 4 of the connecting rod 2, good lubrication is realized, and abnormal sound caused by insufficient lubrication at the position is avoided.
The outer side wall of the piston body 1 is provided with an oil groove 13 along the circumferential direction; the piston assembly 100 further comprises piston rings (not shown in the drawings) disposed in the oil groove 13; the piston body 1 has a fitting cavity 11 with an open lower end, and the piston pin 3 and the connecting rod 2 are at least partially disposed in the fitting cavity 11. Specifically, the connecting rod 2 comprises a rod body, a small head end and a large head end, wherein the small head end and the large head end are formed at two opposite ends of the rod body, the small head end is accommodated in the matching cavity 11, and the large head end is used for connecting a crankshaft; the small end is provided with a mounting hole, and a shaft sleeve 4 arranged at the mounting hole is connected with the piston pin 3. In application, the piston assembly 100 is movably disposed in a cylinder of an engine, the piston is subjected to air pressure, and the air pressure is transmitted to the connecting rod 2 through the piston pin 3, and the connecting rod 2 pushes a crankshaft to rotate. Other structures and operation mechanisms of the piston assembly 100 are well known and will not be described in detail herein.
When the engine is in a cold start state and a low-speed idling state, if sufficient lubricating oil is not available between the piston pin 3 and the shaft sleeve 4, abnormal noise is generated between the piston pin 3 and the shaft sleeve 4 due to friction interference. Therefore, in the present embodiment, by providing the oil passage 14 between the oil groove 13 and the ring cavity section 12, the oil scraped from the inner wall of the engine cylinder by the piston ring and retained in the oil groove 13 can be collected, and the collected oil is guided to the ring cavity section 12 and directly acts on the joint between the piston pin 3 and the shaft sleeve 4, so as to lubricate the joint, thereby avoiding oil loss and improving the lubricating effect.
It is understood that the specific representation of the oil passage 14 is not limited in this design, for example, for ease of forming, the oil passage 14 may be provided as a straight passage extending from the oil groove 13 directly toward the annular cavity section 12. Referring to fig. 3, in the present embodiment, the oil passages 14 include a first oil passage 141 and a second oil passage 142 sequentially communicated in a direction close to the annular cavity section 12; the first oil passage 141 and the second oil passage 142 are arranged at a crossed included angle. With such an arrangement, the opening positions, the extending directions and the lengths of the first oil passage 141 and the second oil passage 142 on the piston body 1 can be specifically adjusted according to actual needs, and it is only required to ensure that the oil passage 14 formed by the first oil passage 141 and the second oil passage 142 can communicate the oil groove 13 and the annular cavity section 12; the arrangement of the first oil passage 141 and the second oil passage 142 is helpful to flexibly adjust the specific structure of the oil passage 14 according to different practical application environments of the piston body 1 and the piston body 1, so that the piston has more universality.
It should be noted that, in the present design, the number of the first oil passages 141 and the second oil passages 142 is not limited, for example, one end of each first oil passage 141 away from the oil groove 13 may be correspondingly communicated with one or more second oil passages 142, and at this time, the plurality of second oil passages 142 may be arranged at intervals along the circumferential direction of the annular cavity section 12; alternatively, one end of the plurality of first oil channels 141 far away from the oil groove 13 may be communicated with the same second oil channel 142, and at this time, one end of the plurality of first oil channels 141 communicated with the oil groove 13 may be arranged at different oil grooves 13; alternatively, each of the first oil passages 141 is correspondingly communicated with one of the second oil passages 142.
Due to the fact that the actual orientation and the actual direction of movement of the piston in different applications are different, for example, vertical or lateral. Therefore, for convenience of description, the piston body 1 is defined as having a lower end into which the connecting rod 2 is inserted and an upper end disposed opposite to the lower end, that is, a direction from the upper end of the piston body 1 to the lower end of the piston body 1 is a vertical direction. The oil passage 14 is inclined gradually downwards in the direction close to the annular cavity section 12. When the piston reciprocates up and down in the engine cylinder, oil scraped off by the piston ring has a tendency of moving upwards or downwards relative to the piston body 1; the oil duct 14 is obliquely arranged to form an obliquely extending flow guide surface, so that oil entering the oil duct 14 can flow into the annular cavity section 12 along the flow guide surface, the flow velocity of the oil is accelerated, and the lubricating effect on the piston pin 3 and the shaft sleeve 4 is optimized.
Next, referring to fig. 4, in an embodiment, the inclination angle of the first oil passage 141 is larger than the inclination angle of the second oil passage 142. Because the first oil passage 141 is closer to the oil groove 13 than the second oil passage 142, by setting the inclination angle of the first oil passage 141 larger than that of the second oil passage 142, the flow rate of oil at the first oil passage 141 is larger than that at the second oil passage 142, and then the oil remained at the oil groove 13 can rapidly enter the oil passage 14, so as to avoid the oil from accumulating at the communication part of the oil groove 13 and the first oil passage 141, which leads to the blockage of the oil passage 14, the obstruction of the oil circulation, and the influence on the lubricating effect at the piston pin 3 and the shaft sleeve 4; in addition, the inclination angle of the second oil passage 142 is smaller than that of the first oil passage 141, so that the flow rate of oil flowing to the second oil passage 142 is gradually gentle, the potential energy is reduced, the oil can uniformly enter the annular cavity section 12, and a better lubricating effect is achieved.
In addition, referring to fig. 2, in the present embodiment, a plurality of oil passages 14 are arranged at intervals along the circumferential direction of the piston body 1. So set up for remain oil liquid homoenergetic at each department of oil groove 13 can get into oil duct 14, just right annular chamber section 12 lubricates everywhere along its circumferencial direction, helps increasing the oil solution volume, dispersion and even fluid distribution, accelerates the fluid velocity of flow simultaneously, thereby improves lubricating efficiency.
Based on the above, in the present embodiment, the axes of any two of the oil passages 14 in the plurality of oil passages 14 are not arranged in line. It can be understood that the axes of any two oil passages 14 are not collinear, that is, the connecting line between any two oil passages 14 is ensured not to penetrate through the radial direction of the piston body 1, which helps to reduce the influence of the opening of the oil passages 14 on the strength of the piston body 1 as much as possible.
Further, in the present embodiment, the oil passage 14 includes an oil outlet section 14a disposed adjacent to the annular cavity section 12; the oil outlet section 14a of each oil passage 14 extends along the tangential direction of the annular cavity section 12 at the position. According to the arrangement, the oil entering the annular cavity section 12 through the oil passage 14 has a tendency of moving along the circumferential direction of the annular cavity section 12, so that the oil can be dispersed at each circumferential position of the joint of the piston pin 3 and the connecting rod 2 as much as possible, and the phenomenon that the oil entering the annular cavity section 12 through the oil passage 14 is unevenly distributed to cause excessive oil in partial areas and the partial areas cannot be lubricated in time is avoided.
Certainly, the specific size of the oil passage 14 is not limited in the design, but it should be noted that, taking the diameter of the oil passage 14 as an example, if the diameter of the oil passage 14 is too small, the flow of oil in the oil passage 14 is affected, and the interference effect of the inner side wall of the oil passage 14 on the oil is possibly greater than the kinetic energy of the oil, so that the oil is retained and blocked in the oil passage 14; on the contrary, if the diameter of the oil passage 14 is too large, the strength of the piston body 1 is affected. Therefore, the diameter of the oil passage 14 in this embodiment is 2-4mm, which not only can ensure smooth flow of oil in the oil passage 14, but also helps to reduce the influence of the opening of the oil passage 14 on the strength of the piston body 1.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A piston is used for an engine and is characterized by comprising a piston body, wherein the piston body is provided with a matching cavity for mounting a piston pin and a connecting rod, the matching cavity comprises an annular cavity section corresponding to a shaft sleeve, and the peripheral side wall of the piston body is provided with an oil groove;
the piston body is further provided with an oil duct communicated with the oil groove and the annular cavity section, and the oil duct is used for guiding oil in the oil groove to the annular cavity section.
2. The piston of claim 1 wherein said oil passages include a first oil passage and a second oil passage in series in a direction adjacent said annular cavity section;
the first oil duct and the second oil duct are arranged in a crossed included angle.
3. The piston according to claim 2, wherein said piston body has a lower end for insertion of a connecting rod, and an upper end disposed opposite to said lower end;
the oil passage is gradually and obliquely arranged downwards in the direction close to the annular cavity section.
4. The piston of claim 3 wherein the angle of inclination of said first oil gallery is set greater than the angle of inclination of said second oil gallery.
5. The piston according to claim 1, wherein said oil passage is provided in plurality at intervals in a circumferential direction of said piston body.
6. The piston of claim 5 wherein the axes of any two of said oil passages in said plurality of oil passages are not co-linearly disposed.
7. The piston of claim 5 wherein said oil gallery includes an oil outlet section disposed adjacent said annular cavity section;
the oil outlet section of each oil passage extends along the tangential direction of the annular cavity section at the position of the oil outlet section.
8. The piston according to any one of claims 1 to 7 wherein said oil gallery has a diameter of 2-4 mm.
9. A piston assembly for use in an engine cylinder, comprising:
the piston according to any one of claims 1 to 8;
the connecting rod is arranged in the matching cavity and is provided with a small head end extending into the matching cavity and a large head end positioned outside the matching cavity, and the small head end of the connecting rod is provided with a mounting hole;
the piston pin is arranged in the mounting hole in a penetrating mode; and the number of the first and second groups,
and the shaft sleeve is arranged between the mounting hole and the piston pin.
10. An engine comprising the piston assembly of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020985800.4U CN212296647U (en) | 2020-06-01 | 2020-06-01 | Piston, piston assembly and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020985800.4U CN212296647U (en) | 2020-06-01 | 2020-06-01 | Piston, piston assembly and engine |
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| Publication Number | Publication Date |
|---|---|
| CN212296647U true CN212296647U (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020985800.4U Active CN212296647U (en) | 2020-06-01 | 2020-06-01 | Piston, piston assembly and engine |
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| CN (1) | CN212296647U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112594026A (en) * | 2021-03-02 | 2021-04-02 | 山东交通职业学院 | Engine lubricating structure |
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2020
- 2020-06-01 CN CN202020985800.4U patent/CN212296647U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112594026A (en) * | 2021-03-02 | 2021-04-02 | 山东交通职业学院 | Engine lubricating structure |
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