CN206972392U - A kind of engine piston and engine - Google Patents
A kind of engine piston and engine Download PDFInfo
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- CN206972392U CN206972392U CN201720464115.5U CN201720464115U CN206972392U CN 206972392 U CN206972392 U CN 206972392U CN 201720464115 U CN201720464115 U CN 201720464115U CN 206972392 U CN206972392 U CN 206972392U
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Abstract
The utility model provides a kind of engine piston and engine, and engine piston includes：Top land, piston crown and the piston skirt being sequentially connected；Wherein, top land, which is provided with, multiple keeps away valve pool；Piston crown is provided with annular groove, and multiple through holes for leading to engine piston inner chamber by annular groove are provided with annular groove.The utility model solves engine piston because piston-top surface rises, and reduces with valve motion gap, causes to produce the problem of piston collides with valve in engine operation process.
Description
Technical Field
The utility model relates to the technical field of engines, in particular to engine piston and engine.
Background
The piston is the heart of an automobile engine, and in the working cycle of the engine, the piston is used for bearing gas pressure and driving a crankshaft to rotate by a connecting rod through a piston pin, so that chemical energy is converted into mechanical energy and is output outwards. The piston works under the conditions of high temperature, high pressure, high speed and poor lubrication, bears alternating mechanical load and thermal load, and is one of the most severe key parts in the engine under the working condition. The piston crown is also an integral part of the combustion chamber and is in direct contact with the hot gases.
Therefore, the piston needs to have heat resistance, wear resistance, smooth guidance and good sealing function, so as to reduce the friction work loss of the engine as much as possible and reduce oil consumption, noise and emission. In order to improve the performance and efficiency of the engine, on the premise of ensuring that the strength and the rigidity of the piston meet the requirements, the compression ratio of the piston needs to be improved, the friction work loss is reduced, the weight of the piston is reduced, and the clearance between the piston and the valve is ensured.
However, in order to increase the compression ratio of the piston, the compression height of the piston needs to be increased, so that the top surface of the piston rises, the clearance between the top surface of the piston and the valve is reduced, and the problem of collision between the piston and the valve is caused during the operation of the engine.
SUMMERY OF THE UTILITY MODEL
The utility model provides an engine piston and engine, its purpose is in order to solve because of the piston top surface rises, and reduces with valve movement clearance, leads to the engine operation in-process to produce the problem of piston and valve collision.
In order to achieve the above object, an embodiment of the present invention provides an engine piston, including:
the piston top, the piston head and the piston skirt are connected in sequence; wherein,
the top of the piston is provided with a plurality of valve avoiding grooves;
the piston head is provided with a ring groove, and the ring groove is provided with a plurality of through holes leading to the inner cavity of the engine piston through the ring groove.
Preferably, the ring grooves include an oil ring groove and a gas ring groove;
the through hole is arranged on the oil ring groove.
Preferably, the valve avoiding grooves comprise a first valve avoiding groove located at the exhaust side of the piston crown and a second valve avoiding groove located at the intake side of the piston crown.
Preferably, the piston skirt is provided with a pin bore;
the pin hole is a special-shaped pin hole.
Preferably, the eccentricity of the center of the pin bore from the center of the engine piston is 0.8 mm.
In order to achieve the above object, the embodiment of the present invention further provides an engine, including the above engine piston.
The above technical scheme of the utility model has following beneficial effect:
the engine piston provided by the utility model has the advantages that the valve avoiding groove is arranged on the top of the piston, when the top of the piston is close to the valve, the valve is difficult to collide with the top of the piston due to the valve avoiding groove, so that the situation that the position of the valve avoiding groove becomes a local hot spot due to the heat generated by collision can be effectively avoided, and even the engine piston is broken by serious people; the groove wall at the arc-shaped edge of the valve avoiding groove is designed to be an inclined surface, so that the avoiding space is increased, and the detonation risk is reduced; the oil ring groove of the piston head is provided with a through hole leading to the inner diameter, so that cooling oil can flow out of the inner cavity to the oil ring groove, on one hand, the cooling effect is achieved on the piston skirt part, and on the other hand, the lubricating effect is achieved on the oil ring groove. The utility model provides an engine piston because of the piston top surface rises, reduces with valve movement clearance, leads to the engine operation in-process to produce the problem of piston and valve collision.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and 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 these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an engine piston according to an embodiment of the present invention;
FIG. 2 shows a top view of FIG. 1;
3 fig. 3 3 3 shows 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 fig. 32 3. 3
Description of reference numerals:
1. a piston top; 2. a piston head; 3. a piston skirt; 4. a valve avoiding groove; 5. a through hole; 6. an oil ring groove; 7. a gas ring groove; 8. a pin hole; 9. a first valve avoiding groove; 10. and a second valve avoiding groove.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1-3, an embodiment of the present invention provides an engine piston, including:
the piston comprises a piston top 1, a piston head 2 and a piston skirt 3 which are connected in sequence;
the engine piston is a part which reciprocates in the cylinder body of the automobile engine cylinder. The piston crown 1 is the main part that constitutes the combustion chamber and its shape is related to the selected combustion chamber form. In particular, gasoline engines mostly use flat-top pistons, which have the advantage of small heat absorption area. The primary function of an engine piston is to withstand the combustion pressures in the cylinder and transfer this force to the crankshaft via the piston pin and connecting rod.
The piston top 1 is a component of a combustion chamber, so that the piston top is often made into different shapes, and the gasoline engine piston top is mostly flat-topped or concave-topped, so that the combustion chamber has compact structure, small heat dissipation area and simple manufacturing process.
Wherein, below the piston top 1 is a piston head 2, and the part below the piston ring groove of the piston head 2 is a piston skirt 3. The piston skirt 3 serves to guide the piston in the cylinder in a reciprocating motion and to receive side pressure. When the engine works, the piston can generate bending deformation under the action of gas pressure in the cylinder, and after the piston is heated, the expansion amount of the piston pin is larger than that of other parts because the piston pin is provided with more metal.
Specifically, in the embodiment of the present invention, the piston top 1 is provided with a plurality of valve avoiding grooves 4;
under the normal condition, in order to improve the compression ratio of the piston, the compression height of the piston needs to be improved, so that the top surface of the piston rises, the movement clearance with the valve is reduced, and the problem of collision between the piston and the valve is caused in the running process of an engine; therefore, in the embodiment of the present invention, a plurality of valve avoiding grooves 4 for avoiding the valve are provided at the piston top 1; when the piston top 1 is close to the valve, the valve is difficult to collide with the piston top 1 due to the existence of the valve avoiding groove 4, so that the situation that the position of the valve avoiding groove 4 becomes a local hot spot due to collision to cause engine knocking and even engine piston breakage is caused by serious conditions is avoided.
The piston head 2 is provided with a ring groove, and the ring groove is provided with a plurality of through holes 5 leading to the inner cavity of the engine piston from the ring groove;
specifically, the piston head 2 is provided with a ring groove for mounting a piston ring, and the piston ring is used for preventing high-temperature and high-pressure gas from flowing into a crankcase and preventing engine oil from flowing into a combustion chamber; the heat absorbed by the piston crown 1 is also largely transferred to the cylinder via the piston head 2 and thus via the cooling medium.
The piston head 2 is usually formed with a plurality of ring grooves for mounting piston rings, the number of which depends on the sealing requirements and is related to the engine speed and the cylinder pressure.
Preferably, in the embodiment of the present invention, the ring grooves include an oil ring groove 6 and a gas ring groove 7;
the through-hole 5 is provided on the oil ring groove 6.
Wherein, the through hole 5 is communicated to the inner cavity of the piston by the ring groove; in the working process of the engine, a cooling nozzle of the piston can spray cooling engine oil to an inner cavity of the piston; due to the through holes 5, the cooling oil can flow out of the inner cavity to the oil ring groove 6, so that the cooling effect is exerted on the piston skirt 3 on one hand, and the lubricating effect is exerted on the oil ring groove 6 on the other hand.
As a specific example, referring to fig. 3, the engine piston shown in fig. 3 is provided with two gas ring grooves 7 and one oil ring groove 6 in a cross-sectional view; the total height of the engine piston is 53.4 mm, the compressible height is 32.9 mm, the thickness of the top of the piston is 5.5 mm, the depth of a combustion chamber at the top of the piston is 1.4 mm, and the height of a firepower bank (the height of the top bank between the top of the piston and a first ring groove) is 5.8 mm; the width of the first gas ring groove 7 is 1.2 mm, the height of the bank of the first gas ring groove 7 is 5 mm, the width of the second gas ring groove 7 is 1.2 mm, the height of the bank of the second gas ring groove 7 is 2.8 mm, and the width of the oil ring groove 6 is 2 mm.
Optionally, the oil hole radius is 2.5 millimeters.
Preferably, in an embodiment of the invention, the valve avoiding groove 4 comprises a first valve avoiding groove 9 located at the exhaust side of the piston top 1 and a second valve avoiding groove 10 located at the intake side of the piston top 1.
Wherein, the bottom surfaces of the first valve avoiding groove 9 and the second valve avoiding groove 10 are both fan-shaped, and the groove walls at the arc-shaped edges of the first valve avoiding groove 9 and the second valve avoiding groove 10 adopt an inclined plane design, so that the space is avoided in an increasing way, local hot spots are eliminated simultaneously, and the detonation risk is reduced. Since the edge of the second bypass valve groove 10 on the intake side is located a short distance from the fire land, a hot spot is likely to be formed, and therefore, the depth of the second bypass valve groove 10 should be deeper than the depth of the first bypass valve groove 9.
As a specific example, the depth of the second bypass valve groove 10 on the intake side may be 4.2 mm, the distance between the edge and the center line of the piston pin hole 8 is 38 mm, the radius is 18 mm, and the angle is 22 degrees;
the depth of the first valve avoiding groove 9 on the exhaust side is 2.1 mm, the distance between the edge and the central line of the piston pin hole 8 is 39.4 mm, the radius is 16 mm, and the angle is 22 degrees.
Preferably, the piston skirt 3 is provided with pin holes 8;
the pin hole 8 is a special-shaped pin hole 8.
Wherein, the special-shaped pin hole 8 comprises an elliptical hole, an inner taper pin hole 8 and the like; the special-shaped pin hole 8 can effectively reduce the friction work loss.
Preferably, the eccentricity of the center of the pin hole 8 from the center of the engine piston is 0.8 mm.
Referring to fig. 3, point O (the point where the two dotted lines intersect at the position of the pin hole 8 is point O) is the center of the pin hole 8, and a straight line L is a straight line where the center of the engine piston is located; the O point is 0.8 mm from the center of the engine piston.
Alternatively, the friction of the piston may be reduced by reducing the area of the piston skirt 3 to reduce frictional work losses.
The engine piston provided by the utility model, through setting up the valve avoiding groove 4 at the piston top 1, when the piston top 1 is close to the valve, the valve is difficult to collide with the piston top 1 because of the existence of the valve avoiding groove 4, so that the position of the valve avoiding groove 4 can be effectively prevented from becoming a local hot spot due to the heat generated by collision, and even the engine piston is broken by serious people; the groove wall at the arc-shaped edge of the valve avoiding groove 4 adopts an inclined surface design so as to increase the avoiding space and reduce the detonation risk; the oil ring groove 6 of the piston head 2 is provided with a through hole 5 leading to the inner diameter, so that cooling oil can flow out of the inner cavity to the oil ring groove 6, on one hand, the cooling effect is achieved on the piston skirt part 3, and on the other hand, the lubricating effect is achieved on the oil ring groove 6. The utility model provides an engine piston because of the piston top surface rises, reduces with valve movement clearance, leads to the engine operation in-process to produce the problem of piston and valve collision.
In order to achieve the above object, the embodiment of the present invention further provides an engine, including the above engine piston.
It should be appreciated that reference throughout this specification to "a particular embodiment," "at least one embodiment," or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least one embodiment or example of the present invention. Thus, the appearances of the phrases "in one embodiment," "in one embodiment," or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In addition, in one or more embodiments herein, terms such as "comprising" or "including" are used to specify the presence of the stated features or components, but do not preclude the presence or addition of one or more other stated features or one or more other components.
Moreover, in the embodiments of the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and "disposed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. An engine piston, comprising:
the piston top, the piston head and the piston skirt are connected in sequence; wherein,
the top of the piston is provided with a plurality of valve avoiding grooves;
the piston head is provided with the annular, be provided with on the annular a plurality of by the annular accesss to the through-hole of engine piston inner chamber.
2. The engine piston of claim 1, wherein said ring grooves include an oil ring groove and a gas ring groove;
the through hole is arranged on the oil ring groove.
3. The engine piston of claim 1 wherein said valve bypass grooves comprise a first valve bypass groove on an exhaust side of said piston crown and a second valve bypass groove on an intake side of said piston crown.
4. The engine piston of claim 1 wherein said piston skirt is provided with pin bores;
the pin holes are special-shaped pin holes.
5. The engine piston of claim 4 wherein the eccentricity of the center of the pin bore from the center of the engine piston is 0.8 millimeters.
6. An engine, comprising: an engine piston as claimed in any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720464115.5U CN206972392U (en) | 2017-04-28 | 2017-04-28 | A kind of engine piston and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720464115.5U CN206972392U (en) | 2017-04-28 | 2017-04-28 | A kind of engine piston and engine |
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| Publication Number | Publication Date |
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| CN206972392U true CN206972392U (en) | 2018-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720464115.5U Active CN206972392U (en) | 2017-04-28 | 2017-04-28 | A kind of engine piston and engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757152A (en) * | 2018-08-07 | 2018-11-06 | 奇瑞汽车股份有限公司 | Combustion system of direct injection supercharged gasoline engine |
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2017
- 2017-04-28 CN CN201720464115.5U patent/CN206972392U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757152A (en) * | 2018-08-07 | 2018-11-06 | 奇瑞汽车股份有限公司 | Combustion system of direct injection supercharged gasoline engine |
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