CN211737308U

CN211737308U - Piston of diesel engine

Info

Publication number: CN211737308U
Application number: CN202020138687.6U
Authority: CN
Inventors: 潘荣国; 林正飞; 周俏山; 薛孝育; 崔乐乐
Original assignee: Zhejiang Dongxin Carter Technology Co ltd
Current assignee: Zhejiang Dongxin Carter Technology Co ltd
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2020-10-23
Anticipated expiration: 2030-01-21

Abstract

The utility model discloses a diesel engine piston, including piston body and the piston key seat that is the dome form, it has annular alloy ring to inlay in the head position of piston body, be equipped with annular first seal groove on the alloy ring, dispose the heat-resisting protective shroud on first seal groove, still be provided with the second seal groove of axial arrangement in proper order on the piston body, be equipped with on the second seal groove with the communicating oil outlet of piston body inner chamber, be equipped with the key seat hole on the piston key seat, be equipped with vertically and horizontally staggered's lubrication way on the pore wall in key seat hole, be equipped with the through-hole of axial setting on the piston key seat, this through-hole one end intercommunication lubrication slide way, the piston key seat is the pipe form, be equipped with the grooving corresponding with piston key seat port on the piston body outer wall, be equipped with the louvre on the groove face of grooving, terminal surface edge sets up and is incurve brush groove under the. This achieves a technical effect that the lubrication is reliable.

Description

Piston of diesel engine

Technical Field

The utility model relates to a part on the engine, concretely relates to diesel engine piston.

Background

The piston is a reciprocating element in the cylinder body of the automobile engine. The basic structure of the piston can be divided into a crown, a crown and a skirt. The piston crown is the main part that makes up the combustion chamber and its shape is related to the combustion chamber form chosen. The top of the piston of the diesel engine is provided with various pits, and the specific shape, the position and the size of the pits are required to be suitable for the requirements of mixture formation and combustion of the diesel engine.

In operation, a spark plug on the cylinder head generates electric sparks through high voltage electricity to ignite the mixed gas, and the combustion time is short and is about 0.015 second; but at a fast speed, up to about 30 meters per second. The gas expands violently, the pressure increases sharply to reach 60 to 75 atmospheres, and the temperature of the combustion gas reaches 2000 to 2500 ℃. During combustion, the local temperature may reach three or four thousand degrees, and the impact force of the gas on the piston may reach 15 tons. The piston moves rapidly to the bottom dead center under the action of strong pressure of fuel gas, the connecting rod is pushed to run downwards, and the connecting rod drives the crankshaft to rotate.

Therefore, the motion of the piston is operated at high speed and high temperature, and the existing piston is easy to cause cylinder pulling because the piston cannot obtain lubrication, so that certain parts on the piston are subjected to dry friction, and the cylinder is damaged. The other is that the piston ring is not cooled in time, and expands due to heating expansion, so that the cylinder is expanded and dead, a cylinder is pulled, and the bent deformation of the crankshaft can be caused in severe cases.

Disclosure of Invention

In order to solve the problem, the utility model aims to provide a lubricated reliable diesel engine piston.

In order to achieve the above purpose, the utility model provides a following technical scheme: a piston of a diesel engine comprises a piston body and a piston pin boss which are in a round cover shape, wherein a circular ring-shaped alloy ring is embedded at the head position of the piston body, a first annular sealing groove is formed in the alloy ring, a heat-resistant retainer is configured on the first sealing groove, second sealing grooves which are sequentially and axially arranged are further formed in the piston body, an oil outlet hole communicated with the inner cavity of the piston body is formed in each second sealing groove, a pin boss hole is formed in each piston pin boss, lubrication channels which are vertically and horizontally staggered are formed in the hole wall of each pin boss hole, a through hole which is axially formed in each piston pin boss is formed in each piston pin boss, one end of each through hole is communicated with the lubrication channels, each piston pin boss is in a pipe shape, a cutting groove corresponding to the port of each piston pin boss is formed in the outer wall of the piston body, and heat dissipation holes are formed in the groove, the edge of the lower end face of the cutting groove is provided with a brush groove which is bent inwards.

The oil outlet is arranged with wide inside and narrow outside.

The outer diameter of the alloy ring is smaller than the outer diameter of the lower end of the piston body.

The structure of the utility model is provided with the piston ring on the second sealing groove, so the port of the oil outlet is sealed by the piston ring, the lubricating oil is difficult to overflow, the oil outlet can obtain a certain overflow pressure under the high-speed movement by adopting the design of wide inside and narrow outside of the oil outlet, so that the lubricating oil can be more easily overflowed and lubricated to the piston ring, the alloy ring has higher hardness, can improve the wear resistance and the high temperature resistance of the head part of the piston body, and can be placed at the position of the head part of the piston body to crack after being provided with the heat-resistant guard ring, meanwhile, the design of the piston pin seat hole can lead lubricating oil to flow to the gap position between the connecting rod and the piston pin seat so as to lead the transmission to be smoother, and the brush groove can be used for driving the lubricating oil to be more lubricated on the inner wall of the piston cylinder, and the heat dissipation holes in the cutting groove can be used for increasing the heat dissipation area, so that the piston is convenient to cool, and the technical effect of reliable lubrication is realized.

The invention is further described with reference to the accompanying drawings and the detailed description.

Drawings

FIG. 1 is a perspective view of an embodiment of the present invention;

fig. 2 is a cross-sectional view of an embodiment of the present invention.

Detailed Description

The present invention is described in detail below with reference to the following examples, which are only used for further illustration of the present invention, and should not be construed as limiting the scope of the present invention.

As shown in fig. 1 and fig. 2, the present embodiment discloses a piston for a diesel engine, which includes a piston body 1 and a piston pin boss 2, wherein a circular ring-shaped alloy ring 3 is embedded at a head position of the piston body 1, a circular first sealing groove 31 is provided on the alloy ring 3, a heat-resistant guard ring 4 is disposed on the first sealing groove 31, a second sealing groove 11 is further provided on the piston body 1, which are axially arranged in sequence, an oil outlet 5 is provided on the second sealing groove 11, which is communicated with an inner cavity of the piston body 1, a pin boss hole 21 is provided on the piston pin boss 2, criss-cross lubrication channels are provided on a hole wall of the pin boss hole 21, a through hole 22 is provided on the piston pin boss 2, one end of the through hole 22 is communicated with a lubrication slide way, the piston pin boss 2 is tubular, a cutting groove 6 corresponding to a port of the piston pin boss 2 is provided on an outer wall of the piston body 1, a heat dissipation, the lower end face edge of the cutting groove 6 is provided with a brush groove 62 which is bent inwards.

The oil outlet 5 is a pinhole, and the inner port is chamfered to form an inner port with a large caliber, so that the inner port can be arranged to be wide at the inner part and narrow at the outer part. The structure can ensure that the piston body 1 can lubricate the piston ring tightly matched on the second sealing groove 11 to a certain degree under the high-speed operation of the piston body, and the lubrication and the working reliability of the piston body are improved.

The outer diameter of the alloy ring 3 is smaller than the outer diameter of the lower end (skirt) of the piston body 1. The head of the piston body 1 is a combustion chamber, so that the temperature of the upper end of the piston body 1 is high in operation, and the thermal expansion of the head is large, so that the piston body 1 can be kept in a cylindrical shape or close to the cylindrical shape in actual operation.

By adopting the technical scheme, because the piston rings are arranged on the second sealing groove 11, the port of the oil outlet 5 is sealed by the piston ring, so that lubricating oil is difficult to overflow, the oil outlet 5 can obtain certain overflow pressure under high-speed motion by adopting the design of wide inside and narrow outside of the oil outlet 5, so that the lubricating oil can be easily overflowed and lubricated to the piston ring, the alloy ring 3 has higher hardness, so that the wear resistance and high temperature resistance of the head part of the piston body 1 can be improved, the cracking of the head part of the piston body 1 can be placed after the heat-resistant guard ring 4 is arranged, meanwhile, the design of the holes of the piston pin base 2 can ensure that the lubricating oil flows to the gap position between the connecting rod and the piston pin base 2, so that the transmission is smoother, the brush groove 62 can bring the lubricating oil to the inner wall of the piston cylinder to be more lubricated, the heat dissipation holes 61 on the cutting groove 6 can improve, this achieves a technical effect that the lubrication is reliable.

Claims

1. The utility model provides a diesel engine piston, is including the piston body and the piston pin boss that are the dome form, its characterized in that: the head position of piston body inlays and has the annular alloy ring be equipped with annular first seal groove on the alloy ring first seal groove on dispose heat-resisting protective ring, still be provided with the second seal groove of axial arrangement in proper order on the piston body the second seal groove on be equipped with the communicating oil outlet of piston body inner chamber, the piston key seat on be equipped with the key seat hole be equipped with vertically and horizontally staggered's lubrication way on the pore wall of key seat hole be equipped with the through-hole of axial setting on the piston key seat, this through-hole one end intercommunication the lubrication way, the piston key seat is the pipe form, be equipped with on the piston body outer wall with the corresponding grooving of piston key seat port be equipped with the louvre on the groove face of grooving, terminal surface edge sets up and is incurve brush groove under the grooving.

2. The diesel engine piston of claim 1, wherein: the oil outlet is arranged with wide inside and narrow outside.

3. The diesel engine piston of claim 1, wherein: the outer diameter of the alloy ring is smaller than the outer diameter of the lower end of the piston body.