CN217176764U

CN217176764U - Piston body

Info

Publication number: CN217176764U
Application number: CN202221445107.3U
Authority: CN
Inventors: 王飒
Original assignee: Hebei Jiyu Machinery Manufacturing Co ltd
Current assignee: Hebei Jiyu Machinery Manufacturing Co ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-08-12
Anticipated expiration: 2032-06-10

Abstract

The utility model discloses a piston body, including the piston top and with the piston skirt that the piston top is brazed connection, the piston top side has seted up a plurality of gas ring grooves, the piston top side has seted up the oil groove, the oil groove is located the gas ring groove below, the piston top side has seted up the combustion chamber, the piston top bottom surface has seted up the upper oil storage tank, the piston skirt top surface has seted up down the oil storage tank, the upper oil storage tank forms the oil storage chamber with lower oil storage tank closure, the oil groove with communicate through a plurality of oilholes between the oil storage chamber, the gas ring groove is overlapped and is equipped with the sealing ring, the oil groove is overlapped and is equipped with the oil ring, the piston skirt lateral wall symmetry has seted up the fixed orifices, adopts brazing welding together after piston top and piston skirt are processed respectively to accomplish, makes piston top and piston skirt form integrated structure, and the rigidity is better, and the machining precision is higher, reduces the assembly clearance between piston body and the cylinder body, reduce the wearing and tearing of sealing ring and gas ring groove, the life of extension piston body.

Description

Piston body

Technical Field

The utility model relates to a piston technical field especially relates to a piston body.

Background

Mechanical parts reciprocating along the cylinder axis in the cylinder of reciprocating piston type internal combustion engines (see internal combustion engines), compressors, pumps and other machines. The piston has 3 forms of a disc shape, a cylinder shape and a cylinder shape. In an internal combustion engine, a piston works under the push of high-temperature and high-pressure fuel gas. In compressors and pumps, a piston exerts a force against fluid within a cylinder to cause the fluid to flow and increase its pressure. In the hydraulic cylinder, a piston does work under the pushing of pressure oil. The closed end surface of the piston bears the pressure of the working fluid and forms a combustion chamber or compression volume with the cylinder cover and the cylinder wall. Piston rings or rubber seals are installed on the piston to prevent fluid leakage. The piston can be made of cast iron, forged steel, cast steel or aluminum alloy and the like.

Although the aluminum piston has the advantage of light weight, the aluminum piston can not meet the requirements of high speed, high load and high strengthening of the current diesel engine, and various steel and iron pistons are continuously emerged. The hinged pendulum piston is a combined piston and consists of a piston head bearing axial force and a piston skirt bearing lateral force and guiding, because the piston head and the piston skirt are manufactured separately, and the two parts are connected through high-precision high-strength bolts. The steel has good high-temperature and normal-temperature performances and is an ideal material for resisting mechanical load and thermal load of a piston top, but the threaded connection is connection with great stress concentration and is easy to damage, so that the threaded connection fails, and the piston fails.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to provide a piston body, which aims to solve or improve at least one of the above technical problems.

In order to achieve the above object, the utility model provides a following scheme: the utility model provides a piston body, including the piston crown and with the piston skirt of piston crown brazed connection, a plurality of gas ring grooves have been seted up to the piston crown side, the oil groove has been seted up to the piston crown side, the oil groove is located the gas ring groove below, the combustion chamber has been seted up to the piston crown top, the oil storage tank has been seted up to the piston crown bottom surface, the oil storage tank has been seted up down to the piston skirt top surface, go up the oil storage tank and form the oil storage chamber with the oil storage tank closure down, the oil groove with communicate through a plurality of oilholes between the oil storage chamber, the cover is equipped with the sealing ring on the gas ring groove, the cover is equipped with the oil ring on the oil groove, the fixed orifices that is used for installing the piston pin is seted up to piston skirt lateral wall symmetry.

Preferably, the piston top bottom surface is fixedly provided with a limiting ring, the piston skirt top surface is provided with a limiting groove, and the limiting ring is matched with the limiting groove.

Preferably, a fixing block is fixedly arranged on the inner side of the piston skirt corresponding to the fixing hole, and the fixing hole penetrates through the fixing block.

Preferably, the side wall of the piston skirt is symmetrically provided with mounting grooves, and the fixing holes are located in the mounting grooves.

Preferably, a weight reduction cavity is formed in the center of the bottom surface of the piston top and is communicated with the inner cavity of the piston skirt.

Preferably, the sealing ring is a martensite alloy steel ring body, a nitrided layer is arranged on the outer side of the martensite alloy steel ring body, and a ceramic coating is coated on the outer side of the nitrided layer.

Preferably, the bottom of the outer side wall of the sealing ring is provided with an oil scraping groove.

Preferably, oil pockets are distributed on the contact surface of the oil ring and the cylinder body, and the oil pockets are distributed in a net shape in a staggered mode.

The utility model discloses a following technological effect: during processing, the piston crown and the piston skirt are processed respectively, the oil storage tank and the lower oil storage tank are conveniently processed, a closed oil storage cavity can be formed after the piston crown and the piston skirt are closed, the processing difficulty is reduced, the piston crown and the piston skirt are welded together by brazing after being processed respectively, the piston crown and the piston skirt are enabled to form an integrated structure, the rigidity is better, the processing precision is higher, the assembly clearance between the piston body and the cylinder body is reduced, the abrasion of the sealing ring and the air ring groove is reduced, and the service life of the piston body is prolonged.

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 embodiments will be briefly described 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 view of the outer structure of a piston body;

FIG. 2 is a schematic view of the inner structure of the piston body;

FIG. 3 is an enlarged view of a portion A of FIG. 2;

FIG. 4 is a schematic view of the internal structure of the seal ring;

FIG. 5 is a bottom view of the piston body;

in the figure: 1. a piston top; 2. a piston skirt; 3. a gas ring groove; 4. an oil sump; 5. a combustion chamber; 6. an oil storage chamber; 7. an oil hole; 8. a seal ring; 9. a fixing hole; 10. a limiting ring; 11. a limiting groove; 12. a fixed block; 13. mounting grooves; 14. a weight-reducing cavity; 15. an oil ring; 16. a martensitic alloy steel ring body; 17. a ceramic coating; 18. an oil scraping groove; 19. and a nitride layer.

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.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

The utility model provides a piston body, including piston crown 1 and the piston skirt 2 of being connected with 1 braze welding in piston crown, a plurality of gas ring grooves 3 have been seted up to 1 side in piston crown, oil groove 4 has been seted up to 1 side in piston crown, oil groove 4 is located gas ring groove 3 below, combustion chamber 5 has been seted up to 1 top surface in piston crown, the oil storage tank has been seted up to 1 bottom surface in piston crown, the oil storage tank has been seted up down to 2 top surfaces in piston skirt, go up oil storage tank and lower oil storage tank closed formation oil storage chamber 6, through a plurality of oilholes 7 intercommunication between oil groove 4 and the oil storage chamber 6, the cover is equipped with sealing ring 8 on the gas ring groove 3, the cover is equipped with oil ring 15 on the

oil groove

4, 2 lateral wall symmetries of piston skirt offer the fixed orifices 9 that are used for installing the piston pin (not shown in the picture).

During processing, process piston crown 1 and piston skirt 2 respectively, oil storage tank and lower oil storage tank in convenient processing, can form confined oil storage chamber 6 after making it closed, be provided with the brazing filler metal between piston crown 1 and the piston skirt 2, adopt the brazing welding together after piston crown 1 and the piston skirt 2 are processed respectively, make piston crown 1 and piston skirt 2 form the integrated structure, the rigidity is better, the machining precision is higher, reduce the assembly clearance between piston body and the cylinder body, reduce the wearing and tearing of sealing ring 8 and gas ring groove 3, make the inner wall of the cylinder body of laminating more in the course of the work of piston crown 1 and piston skirt 2, avoid appearing the condition of piston crown 1 and piston skirt 2 disalignment, effectively prolong the life of piston body.

Further optimize the scheme, 1 bottom surface fixed mounting of piston crown has spacing ring 10, and spacing groove 11 has been seted up to 2 top surfaces of piston skirt,

spacing ring

10 and 11 looks adaptations of spacing groove, during 1 and 2 fixed mounting of piston crown, insert spacing ring 10 in the spacing groove 11, take place the dislocation when preventing 1 and 2 fixed mounting of piston skirt of piston crown, effectively strengthen the connection accuracy of 1 and 2 piston skirts of piston crown, increase the coaxial rate of 1 and 2 piston skirts of piston crown.

Further optimize the scheme, the inboard fixed mounting that corresponds fixed orifices 9 of piston skirt 2 has fixed block 12, and fixed orifices 9 runs through fixed block 12, can improve the intensity of fixed orifices 9, increases the area of contact of fixed orifices 9 and piston pin, increases the steadiness of being connected with the piston pin.

Further optimize the scheme, mounting groove 13 has been seted up to 2 lateral walls symmetries of piston skirt, and fixed orifices 9 are located mounting groove 13, and when avoiding installation piston pin in fixed orifices 9, the both ends and the cylinder body surface contact of piston pin cause the cylinder body to damage.

According to the further optimized scheme, the weight reducing cavity 14 is formed in the center of the bottom surface of the piston top 1, the weight reducing cavity 14 is communicated with the inner cavity of the piston skirt 2, the weight of the piston body is effectively reduced through the large-surface weight reducing cavity 14, and materials are saved.

According to the further optimized scheme, the sealing ring 8 is a martensite alloy steel ring body 16, the use strength is met, a nitriding layer 19 is arranged on the outer side of the martensite alloy steel ring body 16, the outer surface of the martensite alloy steel ring body 16 is subjected to gas nitriding, and the martensite alloy steel ring body has excellent wear resistance, fatigue resistance, corrosion resistance and high temperature resistance after nitriding treatment, wherein the hardness of the nitriding layer is 700-1200 HV0.1, and the depth is 0.03-0.07 mm; the ceramic coating 17 coats the outer side of the nitrided layer 19, the ceramic coating 17 is a CrN ceramic coating, the hardness of the ceramic coating 17 is 1200-1800 HV0.05, the thickness of the ceramic coating 17 is 0.01-0.03 mm, and the nitrided layer 19 and the ceramic coating 17 improve the wear resistance of the sealing ring 8 and the capability of bearing combustion pressure and combustion temperature.

Further optimization scheme, 8 lateral wall bottoms of sealing ring have been seted up and have been scraped oil groove 18, scrape oil groove 18 and can retrieve the machine oil of scraping down and scrape in oil groove 18, reduced the machine oil dynamic pressure of ring excircle department, be favorable to reducing the machine oil and consume, scrape oil groove 18 and have the effect of just warping simultaneously, the end face seal ability obtains strengthening.

According to the further optimized scheme, the contact surface of the oil ring 15 and the cylinder body is subjected to napping honing treatment, oil holes are fully distributed on the contact surface of the oil ring 15 and the cylinder body, the oil storage performance is good, the oil holes are distributed in a net-shaped staggered manner, the oil ring 15 has the advantages of high wear resistance and short running-in period, and meanwhile, the abrasion of the working surface is reduced.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "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 merely for convenience of description of the present invention, and do not indicate or imply that the device or element so 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.

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims

1. A piston body, characterized in that: comprises a piston top (1) and a piston skirt (2) connected with the piston top (1) in a brazing way, a plurality of gas ring grooves (3) are arranged on the side surface of the piston top (1), an oil groove (4) is arranged on the side surface of the piston top (1), the oil groove (4) is positioned below the gas ring groove (3), the top surface of the piston top (1) is provided with a combustion chamber (5), the bottom surface of the piston top (1) is provided with an upper oil storage tank, the top surface of the piston skirt (2) is provided with a lower oil storage tank, the upper oil storage tank and the lower oil storage tank are closed to form an oil storage cavity (6), the oil tank (4) is communicated with the oil storage cavity (6) through a plurality of oil holes (7), the gas ring groove (3) is sleeved with a sealing ring (8), the oil groove (4) is sleeved with an oil ring (15), and fixing holes (9) for mounting piston pins are symmetrically formed in the side wall of the piston skirt (2).

2. The piston body of claim 1, wherein: piston top (1) bottom surface fixed mounting has spacing ring (10), spacing groove (11) have been seted up to piston skirt (2) top surface, spacing ring (10) with spacing groove (11) looks adaptation.

3. The piston body of claim 1, wherein: the inner side of the piston skirt (2) is fixedly provided with a fixed block (12) corresponding to the position of the fixed hole (9), and the fixed hole (9) penetrates through the fixed block (12).

4. The piston body of claim 1, wherein: mounting grooves (13) are symmetrically formed in the side wall of the piston skirt (2), and the fixing holes (9) are located in the mounting grooves (13).

5. The piston body of claim 1, wherein: and a weight-reducing cavity (14) is formed in the center of the bottom surface of the piston top (1), and the weight-reducing cavity (14) is communicated with the inner cavity of the piston skirt (2).

6. The piston body of claim 1, wherein: the sealing ring (8) is a martensite alloy steel ring body (16), a nitride layer (19) is arranged on the outer side of the martensite alloy steel ring body (16), and a ceramic coating (17) is coated on the outer side of the nitride layer (19).

7. The piston body of claim 6, wherein: and an oil scraping groove (18) is formed in the bottom of the outer side wall of the sealing ring (8).

8. The piston body of claim 1, wherein: the contact surface of the oil ring (15) and the cylinder body is full of oil holes which are distributed in a net shape in a staggered mode.