CN110617156A - Piston with double cooling oil cavities and assembling method thereof - Google Patents
Piston with double cooling oil cavities and assembling method thereof Download PDFInfo
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- CN110617156A CN110617156A CN201910912765.5A CN201910912765A CN110617156A CN 110617156 A CN110617156 A CN 110617156A CN 201910912765 A CN201910912765 A CN 201910912765A CN 110617156 A CN110617156 A CN 110617156A
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- cooling oil
- oil cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention relates to a piston with double cooling oil cavities, which comprises a piston body, wherein the head part of the piston body is provided with a first cooling oil cavity and a second cooling oil cavity which are communicated with each other; the opening direction of the second cooling oil cavity groove faces the direction of the small end of the connecting rod; the steel sheet is used for sealing an opening of the second cooling oil cavity groove to form a second cooling oil cavity, no welding seam exists in the second cooling oil cavity, and an oil drainage hole is formed in the steel sheet. Because the steel sheet is adopted to seal the opening of the second cooling oil cavity, no welding seam exists in the formed second cooling oil cavity, the technical problems that the welding quality of the welding seam in the middle of the welding seam is difficult to detect, the risk of fracture occurs due to the welding problem, the welding seam cannot be cleaned, the cooling effect is influenced, and the risk of cylinder pulling exists in the working process are solved. Because the opening direction of the second cooling oil cavity groove faces the direction of the small end of the connecting rod, the cooling oil in the second cooling oil cavity flows out of the oil drainage hole in the steel sheet to lubricate the small end of the connecting rod, so that the cooling of the piston body is increased, and the cooling effect of the small end of the connecting rod is increased.
Description
Technical Field
The invention relates to the technical field of piston cooling, in particular to a piston with double cooling oil cavities and an assembling method thereof.
Background
With the improvement of emission requirements and the technical progress, trucks, engineering machinery, ship engines and generator sets are all developed towards high power and high load, and steel pistons and iron pistons gradually replace aluminum alloy pistons in the fields. Most of the steel piston is arranged at the periphery of the combustion chamber, a cooling oil cavity is arranged at the annular groove part of the piston, the top of the inner cavity of the piston and the middle part of the combustion chamber are cooled by splashing of the cooling oil, and the cooling effect is poor. Cast iron pistons are also commonly cast with a cooling gallery, subject to the type of forming.
In order to solve the technical problems, the prior art provides a welded type integral forged steel piston with two cooling oil cavities, the head and the skirt part of the integral forged steel piston are respectively forged and welded after rough machining to form a double-oil-channel mode and a middle welding line, the technical problem that the cooling effect of the piston is not good in the prior art is solved, but the welding quality of the middle welding line is difficult to detect, the risk of fracture is caused by the welding problem, in addition, the welding line in the oil cavity cannot be cleaned, the cooling effect is influenced, inevitable oil return chips enter the cooling oil cavities in the machining process, the integral forged steel piston is difficult to clean, and the danger of cylinder pulling exists in the working process.
Therefore, how to provide a dual-chamber piston capable of solving the above technical problems is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art.
Therefore, one purpose of the invention is to provide a piston with double cooling oil cavities, wherein no welding seam exists in the second cooling oil cavity, and the technical problems that the welding quality of the welding seam in the middle of the welding seam is difficult to detect, the risk of fracture occurs due to the welding problem, the welding seam cannot be cleaned, the cooling effect is influenced, and the danger of cylinder pulling exists in the working process are solved.
The invention provides a piston with double cooling oil cavities, which comprises:
the piston comprises a piston body, wherein a first cooling oil cavity and a second cooling oil cavity which are communicated with each other are formed in the head of the piston body; the opening direction of the second cooling oil cavity groove faces the direction of the small end of the connecting rod;
and the steel sheet is used for sealing an opening of the second cooling oil cavity groove to form a second cooling oil cavity, no welding seam is formed in the second cooling oil cavity, an oil drainage hole is formed in the steel sheet, and the shape of the steel sheet depends on the shape and the sealing mode of the second cooling oil cavity groove.
According to the technical scheme, compared with the prior art, the piston with the double cooling oil cavities is disclosed, firstly, the opening of the second cooling oil cavity is sealed by the steel sheet, no welding seam exists in the formed second cooling oil cavity, and the technical problems that the welding quality of the welding seam in the middle of the welding seam is difficult to detect, the risk of fracture occurs due to the welding problem, the welding seam cannot be cleaned, the cooling effect is influenced, and the risk of cylinder pulling exists in the working process are solved. Secondly, because the opening direction of the second cooling oil cavity groove faces the direction of the small end of the connecting rod, the cooling oil in the second cooling oil cavity flows out of an oil drainage hole in the steel sheet to lubricate the small end of the connecting rod, so that the cooling effect of the piston body is increased, and the cooling effect of the small end of the connecting rod is increased.
Preferably, the shape of the inner cavity of the second cooling oil cavity groove is the same as that of the piston combustion chamber, an installation groove is formed in the opening of the second cooling oil cavity groove, and the steel sheet is installed in the installation groove and then connected with the installation groove into a whole. The shape of the inner cavity of the second cooling oil cavity groove is consistent with that of the combustion chamber, the wall thickness is kept uniform, heat transfer is facilitated, the distance from the combustion chamber to the inner cavity is guaranteed to be 5-8mm, and sufficient supporting area is guaranteed.
Preferably, the mounting groove is an annular groove, the diameter of the top of the annular groove is smaller than that of the bottom of the annular groove, and the diameter of the top of the annular groove is 1-2mm smaller than that of the steel sheet. The installation groove upper portion bulges the lower part promptly and forms the step, and the step is favorable to blocking the steel sheet top, conveniently connects between steel sheet top and installation groove.
Preferably, the steel sheet is a rigid steel sheet or an elastic steel sheet.
Preferably, the edge of the steel sheet is installed into the installation groove, and then the steel sheet is welded with the installation groove at the bottom or the end part of the steel sheet to form a whole. The welding can adopt argon arc welding, CO2 gas shielded welding and other full-circle welding or local spot welding, and the welding requirement is reduced because the welding seam is positioned outside the cooling cavity.
Preferably, the edge of the steel sheet is installed into the installation groove, and then the clamp spring is installed between the bottom of the steel sheet and the installation groove, so that the steel sheet and the installation groove are connected to form a whole. By adopting the scheme, the clamp spring adopts a standard part, and is convenient to install.
Preferably, the steel sheet is an elastic steel sheet, the edge of the steel sheet is installed into the installation groove, the middle of the steel sheet is provided with a connecting hole, the steel sheet is inserted into the connecting hole from the bottom to the top of the steel sheet through a hollow bolt, and the end part of the hollow bolt is matched with a threaded hole in the piston body to enable the steel sheet to deform and form a whole with the installation groove; the hollow bolt is provided with a communicating oil hole which communicates the second cooling oil cavity with the inner oil cavity thereof. By adopting the scheme, the steel sheet is extruded through the hollow bolt, so that the steel sheet is deformed and fixed with the mounting groove, and the mounting is more convenient.
Preferably, the bottom of the opening of the second cooling oil cavity groove is provided with a first bolt hole, the edge of the steel sheet is provided with a second bolt hole corresponding to the first bolt hole, and the edge of the steel sheet is attached to the bottom of the second cooling oil cavity groove and then connected with the second cooling oil cavity groove into a whole through bolts. Wherein the bolt connection position is arranged according to the space of the inner cavity of the piston, and the bolt tightening force is more than 10N.M。
Preferably, a flow area of the communication passage between the first cooling gallery and the second cooling gallery is larger than a flow area of the oil drain hole. The oil quantity in the second cooling oil cavity is ensured, and the cooling oil in the second cooling oil cavity vibrates in the piston in the up-and-down reciprocating motion, so that the cooling effect is improved.
Another object of the present invention is to provide a method for assembling a piston having dual cooling oil chambers, comprising the steps of: after the piston body is subjected to rough machining, heat treatment and finish machining, a second cooling oil cavity groove communicated with the first cooling oil cavity is machined at the bottom of the inner cavity of the head of the piston according to the shape of a combustion chamber, and the opening direction of the second cooling oil cavity groove faces to the small end direction of the connecting rod; and after the piston body is cleaned, assembling a steel sheet at the bottom of the second cooling oil cavity groove to form a second cooling oil cavity, and enabling no welding seam to exist in the second cooling oil cavity.
According to the technical scheme, compared with the prior art, the assembling method of the piston with the double cooling oil cavities, disclosed by the invention, solves the technical problems that the welding quality of a middle welding seam of a welding seam is difficult to detect, the risk of fracture is caused due to the welding problem, the welding seam cannot be cleaned, the cooling effect is influenced, and the risk of cylinder pulling exists in the working process. Secondly, because the opening direction of the second cooling oil cavity groove faces the direction of the small end of the connecting rod, the cooling oil in the second cooling oil cavity flows out of an oil drainage hole in the steel sheet to lubricate the small end of the connecting rod, so that the cooling effect of the piston body is increased, and the cooling effect of the small end of the connecting rod is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a dual cooling gallery piston according to one embodiment (welding scheme) of the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of a piston with two cooling oil chambers (welding scheme and different welding positions) provided by the invention;
FIG. 3 is a perspective view of steel plates in a double cooling oil cavity piston welding scheme provided by the invention;
FIG. 4 is a cross-sectional view of steel plates in a double cooling gallery piston weld scheme according to the present invention;
FIG. 5 is a schematic structural diagram of another embodiment of a piston with two cooling oil chambers (snap spring clamping scheme) according to the present invention;
FIG. 6 is a bottom view of the FIG. 5 drawing;
FIG. 7 is a schematic structural diagram of another embodiment (elastic steel sheet and hollow bolt connection scheme) of the piston with double cooling oil chambers, provided by the invention;
FIG. 8 is a schematic illustration of another embodiment of a dual cooling gallery piston (rigid shim bolting scheme) according to the present invention;
FIG. 9 is a bottom view of FIG. 8;
FIG. 10 is a schematic structural view of the steel sheet of the embodiment shown in FIG. 8.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to 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 two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. 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.
The embodiment of the invention discloses a piston with double cooling oil cavities, wherein no welding seam exists in the second cooling oil cavity, and the technical problems that the welding quality of the welding seam in the middle of the welding seam is difficult to detect, the risk of fracture occurs due to the welding problem, the welding seam cannot be cleaned, the cooling effect is influenced, and the risk of cylinder pulling exists in the working process are solved.
Example 1
The present invention provides a piston with double cooling oil chambers, as shown in figures 1-10, comprising:
the piston comprises a piston body 1, wherein a first cooling oil cavity 2 and a second cooling oil cavity groove 3 which are communicated with each other are formed in the head of the piston body 1; the opening direction of the second cooling oil cavity groove 3 faces the direction of the small end of the connecting rod;
and the steel sheet 4 is used for sealing the opening of the second cooling oil cavity groove 3 to form a second cooling oil cavity, no welding seam exists in the second cooling oil cavity, and an oil drainage hole 41 is formed in the steel sheet 4.
The invention discloses a piston with double cooling oil cavities, which is characterized in that firstly, a steel sheet 4 is adopted to seal an opening of a second cooling oil cavity 3, no welding seam exists in the formed second cooling oil cavity, and the technical problems that the welding quality of the welding seam in the middle of the welding seam is difficult to detect, the risk of fracture occurs due to the welding problem, the welding seam cannot be cleaned, the cooling effect is influenced, and the risk of cylinder pulling exists in the working process are solved. Secondly, because the opening direction of the second cooling oil cavity groove 3 faces the direction of the small end of the connecting rod, the cooling oil in the second cooling oil cavity flows out of the oil drainage hole 41 formed in the steel sheet 4 to lubricate the small end of the connecting rod, so that the cooling effect of the piston body 1 is increased, and the cooling effect of the small end of the connecting rod is increased.
Example 2
The invention provides a piston with double cooling oil cavities, referring to figure 1, the shape of the inner cavity of a second cooling oil cavity groove 3 is the same as that of a piston combustion chamber, an installation groove 31 is arranged at the opening of the second cooling oil cavity groove, and a steel sheet 4 is installed in the installation groove 31 and then is connected with the installation groove 31 into a whole. The shape of the inner cavity of the second cooling oil cavity groove 3 is consistent with that of the combustion chamber, the wall thickness is kept uniform, heat transfer is facilitated, the distance from the combustion chamber to the inner cavity is guaranteed to be 5-8mm, and sufficient supporting area is guaranteed.
Example 3
The invention provides a piston with double cooling oil cavities, wherein the shape of the inner cavity of a second cooling oil cavity groove 3 is the same as that of a combustion chamber of the piston, an installation groove 31 is formed in the opening of the second cooling oil cavity groove, and a steel sheet 4 is installed in the installation groove 31 and then is connected with the installation groove 31 into a whole. The mounting groove 31 is an annular groove, the diameter of the top of the annular groove is smaller than that of the bottom of the annular groove, and the diameter of the top of the annular groove is 1-2mm smaller than that of the steel sheet 4. Namely, the upper part of the installation groove 31 protrudes out of the lower part to form a step, and the step is beneficial to blocking the top of the steel sheet 4 and is convenient for connection between the top of the steel sheet 4 and the installation groove 31.
Example 4
The invention provides a piston with double cooling oil cavities, wherein the shape of the inner cavity of a second cooling oil cavity groove 3 is the same as that of a combustion chamber of the piston, an installation groove 31 is formed in the opening of the second cooling oil cavity groove, and a steel sheet 4 is installed in the installation groove 31 and then is connected with the installation groove 31 into a whole. The mounting groove 31 is an annular groove, the diameter of the top of the annular groove is smaller than that of the bottom of the annular groove, and the diameter of the top of the annular groove is 1-2mm smaller than that of the steel sheet 4. The steel sheet 4 is a rigid steel sheet (e.g. 45#), and is shaped like a concave disc, referring to fig. 4 and 5, the edge of the steel sheet 4 is installed into the installation groove 31, and then the steel sheet 4 is welded with the installation groove 31 at the bottom or end of the steel sheet 4 to form a whole (referring to fig. 1 and 2, the position A is a welding position). The welding can adopt argon arc welding, CO2 gas shielded welding and other full-circle welding or local spot welding, and the welding requirement is reduced because the welding seam is positioned outside the cooling cavity.
Example 5
The invention provides a piston with double cooling oil cavities, and referring to figures 5 and 6, the shape of an inner cavity of a second cooling oil cavity groove 3 is the same as that of a combustion chamber of the piston, an installation groove 31 is formed in the opening of the second cooling oil cavity groove, and a steel sheet 4 is installed in the installation groove 31 and then is connected with the installation groove 31 into a whole. The mounting groove 31 is an annular groove, the diameter of the top of the annular groove is smaller than that of the bottom of the annular groove, and the diameter of the top of the annular groove is 1-2mm smaller than that of the steel sheet 4. The steel sheet 4 is a rigid steel sheet (such as 42CrMo), the edge of the steel sheet 4 is installed in the installation groove 31, and then the clamp spring 5 is installed between the bottom of the steel sheet 4 and the installation groove 31 correspondingly, so that the steel sheet 4 and the installation groove 31 are connected into a whole. By adopting the scheme, the clamp spring 5 adopts a standard part, the installation is convenient, the position H in figure 6 is shown as an oil return hole of the piston body, and the position J is an oil inlet hole.
Example 6
The invention provides a piston with double cooling oil cavities, and referring to figure 7, the shape of the inner cavity of a second cooling oil cavity groove 3 is the same as that of a piston combustion chamber, an opening of the second cooling oil cavity groove is provided with an installation groove 31, and a steel sheet 4 is installed in the installation groove 31 and then is connected with the installation groove 31 into a whole. The mounting groove 31 is an annular groove, the diameter of the top of the annular groove is smaller than that of the bottom of the annular groove, and the diameter of the top of the annular groove is 1-2mm smaller than that of the steel sheet 4. The steel sheet 4 is an elastic steel sheet (such as 65Mn, 70Mn), the edge of the steel sheet is installed into the installation groove 31, the middle part of the steel sheet is provided with a connecting hole, the steel sheet 4 is inserted into the connecting hole from the bottom to the top through a hollow bolt 6, and the end part of the hollow bolt 6 is matched with a threaded hole on the piston body 1 to enable the steel sheet 4 to deform and form a whole with the installation groove 31; by adopting the scheme, the steel sheet 4 is extruded through the hollow bolt 6, so that the steel sheet 4 is deformed and fixed with the mounting groove 31, and the mounting is more convenient.
Example 7
The present invention provides a piston with dual cooling gallery, see fig. 8-10, comprising: the piston comprises a piston body 1, wherein a first cooling oil cavity 2 and a second cooling oil cavity groove 3 which are communicated with each other are formed in the head of the piston body 1; the opening direction of the second cooling oil cavity groove 3 faces the direction of the small end of the connecting rod; the steel sheet 4 is used for sealing the opening of the second cooling oil cavity groove 3 to form a second cooling oil cavity, no welding seam exists in the second cooling oil cavity, and the steel sheet 4And has a drain hole 41. The steel sheet 4 is a rigid steel sheet (such as 42CrMo), a first bolt hole is formed in the bottom of an opening of the second cooling oil cavity groove 3, a second bolt hole 42 corresponding to the first bolt hole is formed in the edge of the steel sheet, and the edge of the steel sheet 4 is attached to the bottom of the second cooling oil cavity groove 3 and then connected with the bottom of the second cooling oil cavity groove into a whole through bolts. The bolt connection position is arranged according to the space of the inner cavity of the piston, and the bolt tightening force is more than 10N.M。
In each of the above embodiments, the flow area of the communication passage 21 between the first cooling oil chamber 2 and the second cooling oil chamber is larger than the flow area of the drain hole 41. The oil quantity in the second cooling oil cavity is ensured, and the cooling oil in the second cooling oil cavity vibrates in the piston in the up-and-down reciprocating motion, so that the cooling effect is improved.
Example 8
The invention provides an assembling method of a piston with double cooling oil cavities, which comprises the following steps: after the piston body 1 is subjected to rough machining, heat treatment and finish machining, a second cooling oil cavity groove 3 communicated with the first cooling oil cavity 2 is machined at the bottom of an inner cavity of the head of the piston according to the shape of a combustion chamber, and the opening direction of the second cooling oil cavity groove 3 faces to the small end direction of the connecting rod; and after the piston body 1 is cleaned, assembling a steel sheet 4 at the bottom of the second cooling oil cavity groove 3 to form a second cooling oil cavity, and enabling no welding seam to exist in the second cooling oil cavity. The technical problems that the welding quality of the middle welding seam is difficult to detect, the risk of fracture is caused by the welding problem, the welding seam cannot be cleaned, the cooling effect is influenced, and the risk of cylinder pulling exists in the working process are solved. Secondly, because the opening direction of the second cooling oil cavity groove 3 faces the direction of the small end of the connecting rod, the cooling oil in the second cooling oil cavity flows out of the oil drainage hole 41 formed in the steel sheet 4 to lubricate the small end of the connecting rod, so that the cooling effect of the piston body 1 is increased, and the cooling effect of the small end of the connecting rod is increased.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A dual cooling gallery piston, comprising:
the piston comprises a piston body (1), wherein a first cooling oil cavity (2) and a second cooling oil cavity groove (3) which are communicated with each other are formed in the head part (11) of the piston body (1); the opening direction of the second cooling oil cavity groove (3) faces the direction of the small end of the connecting rod;
the steel sheet (4) is used for sealing an opening of the second cooling oil cavity groove (3) to form a second cooling oil cavity, no welding seam exists in the second cooling oil cavity, and an oil drainage hole (41) is formed in the steel sheet (4).
2. The piston with double cooling oil cavities as claimed in claim 1, wherein the shape of the inner cavity of the second cooling oil cavity groove (3) is the same as that of the combustion chamber of the piston, an installation groove (31) is formed at the opening of the second cooling oil cavity groove, and the steel sheet (4) is installed in the installation groove (31) and then is integrally connected with the installation groove (31).
3. The piston with two cooling oil cavities as defined in claim 2, wherein said mounting groove (31) is an annular groove, the diameter of the top of the annular groove is smaller than that of the bottom of the annular groove, and the diameter of the top of the annular groove is 1-2mm smaller than that of said steel plate (4).
4. The double cooling gallery piston as claimed in claim 2, wherein the steel plate (4) is a rigid steel plate or an elastic steel plate.
5. A double cooling gallery piston as claimed in claim 3, wherein the edge of the steel plate (4) is fitted into the mounting groove (31) and then welded to the mounting groove (31) at the bottom or end of the steel plate (4) to form a single body.
6. The piston with double cooling oil chambers as claimed in claim 3, wherein the edge of the steel sheet (4) is installed into the installation groove (31), and then the clamp spring (5) is installed corresponding to the bottom of the steel sheet (4) and the middle of the installation groove (31), so that the steel sheet (4) and the installation groove (31) are connected into a whole.
7. A double cooling gallery piston as claimed in claim 3, wherein the steel plate (4) is an elastic steel plate, the edge of the steel plate is installed into the installation groove (31), the middle part of the steel plate is provided with a connecting hole, the connecting hole is inserted into the steel plate (4) from the bottom to the top through a hollow bolt (6), and the end part of the hollow bolt (6) is matched with a threaded hole on the piston body (1) to enable the steel plate (4) to be deformed to form a whole with the installation groove (31); the hollow bolt (6) is provided with a communication oil hole (61), and the second cooling oil cavity is communicated with the inner oil cavity of the second cooling oil cavity through the communication oil hole (61).
8. The piston with double cooling oil cavities as claimed in claim 1, wherein a first bolt hole is formed in the bottom of the opening of the second cooling oil cavity groove (3), a second bolt hole corresponding to the first bolt hole is formed in the edge of the steel sheet (4), and the edge of the steel sheet (4) is attached to the bottom of the second cooling oil cavity groove (3) and then connected with the second cooling oil cavity groove into a whole through a bolt (7).
9. The double-cooling gallery piston as claimed in any one of claims 1 to 8, wherein a flow area of a communication passage (21) between the first cooling gallery (2) and the second cooling gallery is larger than a flow area of the oil drain hole (41).
10. A method for assembling a piston with double cooling oil chambers is characterized by comprising the following steps: after the piston body is subjected to rough machining, heat treatment and finish machining, a second cooling oil cavity groove communicated with the first cooling oil cavity is machined at the bottom of the inner cavity of the head of the piston according to the shape of a combustion chamber, and the opening direction of the second cooling oil cavity groove faces to the small end direction of the connecting rod; and after the piston body is cleaned, assembling a steel sheet at the bottom of the second cooling oil cavity groove to form a second cooling oil cavity, and enabling no welding seam to exist in the second cooling oil cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910912765.5A CN110617156A (en) | 2019-09-25 | 2019-09-25 | Piston with double cooling oil cavities and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910912765.5A CN110617156A (en) | 2019-09-25 | 2019-09-25 | Piston with double cooling oil cavities and assembling method thereof |
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| Publication Number | Publication Date |
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| CN110617156A true CN110617156A (en) | 2019-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910912765.5A Pending CN110617156A (en) | 2019-09-25 | 2019-09-25 | Piston with double cooling oil cavities and assembling method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114017192A (en) * | 2021-11-08 | 2022-02-08 | 博罗县标洁精工五金有限公司 | Motor vehicle piston with strong tensile strength at normal temperature |
-
2019
- 2019-09-25 CN CN201910912765.5A patent/CN110617156A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114017192A (en) * | 2021-11-08 | 2022-02-08 | 博罗县标洁精工五金有限公司 | Motor vehicle piston with strong tensile strength at normal temperature |
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