CN209818178U - Heat insulation piston - Google Patents
Heat insulation piston Download PDFInfo
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- CN209818178U CN209818178U CN201920330730.6U CN201920330730U CN209818178U CN 209818178 U CN209818178 U CN 209818178U CN 201920330730 U CN201920330730 U CN 201920330730U CN 209818178 U CN209818178 U CN 209818178U
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Abstract
The utility model relates to a thermal-insulated piston, include: the piston comprises a piston body, a piston body and a piston body, wherein the piston body is made of forged steel, the top of the piston body is a piston head, and a groove is formed in the piston head; the heat insulation piece is arranged in the groove; and the fixing piece is abutted against the heat insulation piece and is integrated with the heat insulation piece and the groove into a whole through spinning processing or secondary forging. According to the technical scheme, the heat insulation piece is arranged in the groove, and the fixing piece is fixed on the heat insulation piece and is integrated with the heat insulation piece and the groove through spinning processing or secondary forging; the heat insulation piece is added, so that the heat insulation performance of the piston head is improved, and the heat insulation piece and the groove are integrated into a whole through the fixing piece, so that the phenomena of cracks, ablation and the like caused by the fact that a heat insulation coating cannot bear high temperature in the prior art are effectively prevented, and the problem that the bonding strength of the heat insulation piece and the piston body is insufficient is solved; the utility model discloses simple structure, the operational reliability is high.
Description
Technical Field
The utility model relates to an internal-combustion engine technical field, more specifically the utility model relates to a thermal-insulated piston that says so.
Background
Along with the upgrading of the emission standard of an engine, the explosion pressure of the engine is higher and higher, the temperature and the pressure of a combustion chamber and a top surface of a piston are increased along with the explosion pressure, and in order to ensure that the temperature of a ring groove, a pin hole and a skirt part is not too high, the conventional forged steel piston generally has a large cooling oil cavity, so that the heat exchange among the combustion chamber, the top surface and the cooling oil cavity of the piston is remarkable; but simultaneously, the heat loss of the combustion chamber and the top surface is larger, the heat efficiency of the engine is lower, and according to statistics, about 25 percent of energy generated by combustion of the piston combustion chamber is dissipated through the cylinder sleeve and the cooling oil passage; and the temperature difference between the high temperature on the surface of the combustion chamber and the cooling oil duct is huge, so that the thermal stress of the combustion chamber part of the piston is large, and the cracking risk is increased.
Currently, to solve the above problems, many piston manufacturers use thermal barrier coatings on the combustion chamber, top surface, but because the thickness of the coating is only 0.03-0.3mm, such relatively thin coatings have little effect on the temperature barrier to the piston rings and skirt portions. The heat insulation piston disclosed in patent document CN201610539558 is mainly applied to an aluminum piston, because of blocking of a heat insulation layer to heat of a combustion chamber, the temperature of the combustion chamber of the piston, particularly the temperature of a throat of the combustion chamber, rises sharply, and a spray sealing layer of 0.1-0.5mm cracks and ablates due to failure of bearing high temperature, and meanwhile, the heat insulation layer is directly poured on a substrate, so that the problem of insufficient bonding strength between the heat insulation layer and the piston body is easily caused.
Therefore, it is an urgent need to solve the problem of providing a piston with good heat insulation effect and high safety.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a heat-insulating piston has solved among the prior art that the heat-insulating coating heat-proof quality is not good, and the direct spraying of insulating layer is on the piston body, and crackle, the problem of damage appear easily in the high temperature.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an insulated piston, comprising:
the piston comprises a piston body, a piston body and a piston body, wherein the piston body is made of forged steel, the top of the piston body is a piston head, and a groove is formed in the piston head;
the heat insulation piece is arranged in the groove;
and the fixing piece is abutted against the heat insulation piece and is integrated with the heat insulation piece and the groove into a whole through spinning processing or secondary forging.
According to the technical scheme, compared with the prior art, the utility model discloses a heat insulation piston, because the heat insulation piece is arranged in the groove, the fixing piece is fixed on the heat insulation piece, and is integrated with the heat insulation piece and the groove through spinning processing or secondary forging; the heat insulation piece is added, so that the heat insulation performance of the piston head is improved, and the heat insulation piece and the groove are integrated into a whole through the fixing piece, so that the phenomena of cracks, ablation and the like caused by the fact that a heat insulation coating cannot bear high temperature in the prior art are effectively prevented, and the problem that the bonding strength of the heat insulation piece and the piston body is insufficient is solved; the utility model discloses simple structure, the operational reliability is high.
Preferably, the heat insulation piece is made of a material with the thermal conductivity coefficient of less than 20W/mk through processing or casting forming; the thickness is 1-5 mm; to increase the insulating effect.
Preferably, the insulation material is made of ceramic fibers.
Preferably, the piston body and the piston head are integrally connected or separately welded; the universality is strong, and the piston is applicable to both split pistons and integral pistons.
Preferably, an annular fixing table for fixing the fixing piece is arranged on the outer circular surface of the top of the piston head, so that the fixing piece can be fixed, and the use safety of the piston in operation is ensured.
Preferably, the edge of the fixing piece is bent and extended to form a fixing sleeve; the inner wall of the fixed sleeve is in interference fit with the piston body or the outer wall of the piston head; the end surface of the bottom of the fixed sleeve is welded with the top surface of the annular fixed table; by adopting the scheme, the strength of the fixing heat insulation piece through the fixing piece is increased, and the safety of normal work of the heat insulation piston is ensured.
Preferably, the fixing piece is made of plastic metal material, and the thickness of the fixing piece is 3-6 mm; by adopting the scheme, the fixing piece is ensured to have certain ductility, and the heat insulation piece and the piston head are tightly fixed together through the deformation of the fixing piece.
The specific shape and the structural size of the heat insulation piece are selected according to different types of pistons; the specific shape and the structural size of the fixing piece can be selected and designed according to the corresponding heat insulation piece; however, all technical solutions related to the above-mentioned concepts of the present invention should fall within the scope of the present invention.
The utility model provides a pair of machining method of heat insulation piston, including following step:
s1, providing a piston body with a groove at the piston head, and a heat insulation piece and a fixing piece with the same specification;
s2, placing the heat insulation piece in the groove; and/or fixture heating;
s3, taking the piston body with the heat insulation piece placed in the S2 as a lower die of a forging die, and fixing a heated fixing piece in the upper die of the forging die; starting the mold, pressing down the upper mold of the mold to deform the fixing piece, extruding the heat insulation piece and forming a whole with the piston body; welding the fixing piece and the connecting end surface of the piston body;
or placing a fixing piece on the heat insulation piece in S2, primarily fixing the heat insulation piece, and welding the fixing piece and the connecting end face of the piston body; and after welding, spinning on a spinning machine to deform the fixing piece to form a whole with the heat insulation piece and the piston body.
According to the technical scheme, compare with prior art, the utility model discloses a processing method of thermal-insulated piston adopts this method, passes through spin-pressing processing or secondary forging with the mounting and combines and integrative with the piston body, and the heat insulating part is in between the two, and deformation oppression secondary through the mounting is fixed, and then has guaranteed the fastness that the heat insulating part is fixed, and then guarantees the security that the piston used.
Preferably, in S3, the temperature is 200 ℃ to 400 ℃ during spinning. The temperature during forging is 1100-1200 ℃. The above temperature control ensures the coupling of the fixing member with the piston body.
The specific process parameters in the above method are selected and designed according to the piston with different specifications, but all the technical solutions related to the conception by the above method should fall into the protection scope of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required 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 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 structural diagram of an embodiment of a heat insulation piston according to the present invention;
FIG. 2 is a schematic diagram of another embodiment of a thermally insulated piston according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a piston head in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of an embodiment of an insulation member of an insulation piston according to the present invention;
fig. 5 is a schematic structural diagram of an embodiment of a fixing member of a heat insulation piston according to the present invention.
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 work belong to the protection scope of the present invention.
The embodiment of the utility model discloses thermal-insulated piston has solved among the prior art that the heat-proof quality of piston thermal-insulated coating is not good, and the direct spraying of insulating layer is on the piston body, and crackle, the problem of damage appear easily in the high temperature.
Referring to fig. 1 and 2, the present invention provides a heat insulating piston, comprising:
the piston comprises a piston body 1, wherein the piston body 1 is made of forged steel, the top of the piston body is provided with a piston head 2, and the piston head 2 is provided with a groove 21;
the heat insulation piece 3, the heat insulation piece 3 is installed in the groove 21;
and a fixing member 4, wherein the fixing member 4 is abutted against the heat insulating member 3 and is integrated with the heat insulating member 3 and the groove 21 by spinning or secondary forging.
The utility model discloses a heat insulation piston, because the heat insulation piece 3 is installed in the groove 21, the fixing piece 4 is fixed on the heat insulation piece 3 and is integrated with the heat insulation piece 3 and the groove 21 through spinning processing or secondary forging; the heat insulation piece 3 is added, so that the heat insulation performance of the piston head 2 is improved, and the heat insulation piece 3 and the groove 21 are integrated through the fixing piece 4, so that the phenomena of cracks, ablation and the like caused by the fact that a heat insulation coating cannot bear high temperature in the prior art are effectively prevented, and the problem that the bonding strength of the heat insulation piece 3 and the piston body 1 is insufficient is solved; the utility model discloses simple structure, the operational reliability is high.
Advantageously, with reference to fig. 4, the thermal insulation element 3 is formed by machining or casting a material having a thermal conductivity of less than 20W/mk; the thickness is 1-5 mm; to increase the insulating effect.
More advantageously, the insulating element 3 is made of ceramic fibres.
Referring to the attached drawings 1 and 2, a piston body 1 and a piston head 2 are integrally connected or welded in a split manner; the universality is strong, and the piston is applicable to both split pistons and integral pistons.
The utility model discloses an in the embodiment, offer the annular fixed station that is used for fixed mounting 4 on the outer disc in 2 tops of piston head, be favorable to fixed mounting 4, guarantee the safety in utilization in the piston operation.
In another embodiment of the present invention, referring to fig. 5, the fixing member 4 is bent and extended to form a fixing sleeve 41; the inner wall of the fixed sleeve 41 is in interference fit with the outer wall of the piston body 1 or the piston head 2; and the end surface of the bottom of the fixed sleeve 41 is welded with the top surface of the annular fixed table (the welding part marked with the number 5 in the attached figures 1 and 2); adopt this scheme to increase the intensity through fixed heat insulating part 3 of mounting 4, guaranteed the security of the normal work of thermal-insulated piston.
In the above embodiments, the fixing member 4 is made of plastic metal material, and the thickness is 3-6 mm; by adopting the scheme, the fixing piece 4 is ensured to have certain ductility, and the heat insulation piece 3 and the piston head 2 are tightly fixed together through the deformation of the fixing piece.
The specific shape and the structural size of the heat insulation piece 3 are selected according to different types of pistons; the specific shape and the structural size of the fixing piece 4 can be selected and designed according to the corresponding heat insulation piece 3; however, all technical solutions related to the above-mentioned concepts of the present invention should fall within the scope of the present invention.
The utility model provides a pair of machining method of heat insulation piston, including following step:
s1, providing a piston body with a groove at the piston head, and a heat insulation piece and a fixing piece with the same specification;
s2, placing the heat insulation piece in the groove; and/or fixture heating;
s3, taking the piston body with the heat insulation piece placed in the S2 as a lower die of a forging die, and fixing a heated fixing piece in the upper die of the forging die; starting the mold, pressing down the upper mold of the mold to deform the fixing piece, extruding the heat insulation piece and forming a whole with the piston body; welding the fixing piece and the connecting end surface of the piston body;
or placing a fixing piece on the heat insulation piece in S2, primarily fixing the heat insulation piece, and welding the fixing piece and the connecting end face of the piston body; and after welding, spinning on a spinning machine to deform the fixing piece to form a whole with the heat insulation piece and the piston body.
By adopting the method, the fixing piece is combined and integrated with the piston body through spinning processing or secondary forging, the heat insulation piece is positioned between the fixing piece and the piston body, and secondary fixing is pressed through deformation of the fixing piece, so that the fixing firmness of the heat insulation piece is ensured, and the use safety of the piston is further ensured.
Preferably, in S3, the temperature is 200 ℃ to 400 ℃ during spinning. The temperature during forging is 1100-1200 ℃. The above temperature control ensures the coupling of the fixing member with the piston body.
The specific process parameters in the above method are selected and designed according to the piston with different specifications, but all the technical solutions related to the conception by the above method should fall into the protection scope of the present invention.
Specific application example 1
Referring to the attached drawing 1, the utility model discloses a piston body, the recess of processing out and heat insulating part lower surface looks adaptation at piston body's piston head and carry out the shot-blasting and handle, the heat insulating part is carried out the design heat insulating part size of zooming according to the shape of different piston body combustion chambers to through processing or casting shaping heat insulating part. The fixing piece is made of plastic metal material, wherein the diameter of the fixing sleeve is 0.05-0.10mm smaller than that of the piston body at the upper part of the annular fixing table, so that the interference magnitude of assembly between the fixing sleeve and the piston body is ensured. The processed heat insulation piece is placed in the groove, and then the fixing piece is buckled on the head of the piston, so that the heat insulation piece is preliminarily fixed. Welding the bottom end face of the fixed sleeve and the top face of the annular positioning table, extruding the fixed piece, the piston body and the heat insulation piece into a whole through spinning after welding, and then finely machining the top face of the piston and the combustion chamber to obtain the shape and the size of a finished product.
The spinning process is to fix flat or hollow blank onto the mold of spinning machine, and press the blank with spinning wheel or driving rod while the blank rotates along with the main shaft of the machine to produce local plastic deformation. Spinning is a special forming method. The spinning method can be used for drawing, flanging, necking, bulging, curling and the like of the rotating bodies with various shapes.
Concrete application example 2
Referring to fig. 2, the present invention includes a piston body skirt portion and a piston head portion, which are forged separately, the piston body skirt portion is prepared by machining, the upper portion of the piston head portion is processed into a shape corresponding to the lower surface of a heat insulation member, the heat insulation member is cast or formed according to the shape of a combustion chamber, then the heat insulation member and the piston head portion are used as a lower die for secondary forging, a heated fixing member is placed on the upper die of the die, the piston head portion, the heat insulation member and the fixing member are tightly combined together by extrusion of the die, and the piston head portion bottom is welded to the piston body skirt portion; welding is carried out on the bottom end surface of the fixed sleeve and the top surface of the annular positioning table. The welding surface of the piston head and the skirt part of the piston body is welded through friction welding (the welding surface is a welding part indicated by a reference number 8 in the attached drawing 2), after the contact surface is welded, the bottom end surface of the fixed sleeve and the top surface of the annular positioning table are welded, so that the skirt part of the piston body, the piston head, the heat insulation part and the fixing part are integrated, and the piston finished product is obtained through subsequent heat treatment and finish machining.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An insulated piston, comprising:
the piston comprises a piston body (1), wherein the piston body (1) is made of forged steel, the top of the piston body is provided with a piston head (2), and the piston head (2) is provided with a groove (21);
a heat insulation piece (3), wherein the heat insulation piece (3) is arranged in the groove (21);
and the fixing piece (4) is abutted against the heat insulation piece (3), and is integrated with the heat insulation piece (3) and the groove (21) through spinning processing or secondary forging.
2. An insulated piston according to claim 1, characterized in that the thermal insulation element (3) is formed by machining or casting a material with a thermal conductivity of less than 20W/mk; the thickness is 1-5 mm.
3. An insulated piston according to claim 2, characterized in that the material of the insulating element (3) is ceramic fibres.
4. A heat-insulating piston according to any one of claims 1 to 3, characterised in that the piston body (1) and the piston head (2) are integrally connected or separately welded.
5. The heat insulation piston as claimed in claim 4, wherein an annular fixing table for fixing the fixing member (4) is formed on the outer circumferential surface of the top of the piston head (2).
6. An insulated piston as claimed in claim 5, characterized in that the fixing element (4) is bent and extended at its edge to form a fixing sleeve (41); the inner wall of the fixed sleeve (41) is in interference fit with the outer wall of the piston body (1) or the piston head (2); and the bottom end face of the fixed sleeve (41) is welded with the top surface of the annular fixed table.
7. An insulated piston according to claim 6, characterised in that the fixing element (4) is made of plastic metal material and has a thickness of 3-6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920330730.6U CN209818178U (en) | 2019-03-15 | 2019-03-15 | Heat insulation piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920330730.6U CN209818178U (en) | 2019-03-15 | 2019-03-15 | Heat insulation piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209818178U true CN209818178U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920330730.6U Active CN209818178U (en) | 2019-03-15 | 2019-03-15 | Heat insulation piston |
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| CN (1) | CN209818178U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915277A (en) * | 2019-03-15 | 2019-06-21 | 滨州东海龙活塞有限公司 | A kind of insulating piston and its processing method |
-
2019
- 2019-03-15 CN CN201920330730.6U patent/CN209818178U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915277A (en) * | 2019-03-15 | 2019-06-21 | 滨州东海龙活塞有限公司 | A kind of insulating piston and its processing method |
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