CN219159070U

CN219159070U - Three-valve internal combustion engine piston

Info

Publication number: CN219159070U
Application number: CN202223326600.6U
Authority: CN
Inventors: 林维楼; 蔡德见
Original assignee: Zhejiang Tianma Piston Industry Co ltd
Current assignee: Zhejiang Tianma Piston Industry Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-06-09
Anticipated expiration: 2032-12-09

Abstract

The utility model relates to the technical field of pistons, in particular to a three-valve internal combustion engine piston, which comprises a piston skirt, a piston head and a piston top, wherein the upper end of the piston skirt is provided with the piston head, the upper end of the piston head is provided with the piston top, two sides of the upper part of the piston skirt are provided with piston pin seats, a first limit groove is arranged in each piston pin seat, a piston pin is connected in each piston pin seat, two sides of the outer part of each piston pin are provided with a second limit groove, limit rings are connected in the second limit grooves, movable grooves are arranged at the positions, close to the front surface and the back surface, of the lower end of the piston skirt, the inner wall of the piston skirt is connected with steel sheets, the outer part of the piston head is provided with a plurality of ring grooves, a plurality of ring grooves are connected with an air ring and an oil ring, the upper end of the piston top is provided with a plurality of groups of limit protrusions close to the edges, and the middle part of the upper end of the piston top is provided with limit grooves.

Description

Three-valve internal combustion engine piston

Technical Field

The utility model relates to the technical field of pistons, in particular to a three-valve internal combustion engine piston.

Background

The three-valve internal combustion engine comprises three hollow cylinders, in which there is a chamber for the working fluid, the chamber having one end closed by a head, and an opposite end closed by a piston which reciprocates in the chamber between a bottom dead center and a top dead center, and a means for converting the reciprocating rectilinear motion into rotary motion of a drive shaft. For a three valve internal combustion engine, its thermal efficiency is ideally a function of compression ratio, with higher compression ratios leading to higher thermal efficiencies. However, the high compression ratio can cause knocking of the gasoline engine and rough operation of the diesel engine under the working condition of large load, and the compression ratio can be properly improved under the working condition of difficult knocking and rough operation of small load so as to improve the thermal efficiency of the internal combustion engine under the working condition.

The piston skirt plays a role in guiding the reciprocating motion of the piston in the cylinder and bears lateral pressure, the piston is easy to be blocked in the cylinder after the piston skirt is heated, expanded and deformed, the top of the piston is one of the components of the combustion chamber and mainly bears the pressure of combustion gas, the internal space is limited, the combustion is insufficient, and the integral operation is influenced.

Therefore, there is a need to design a three-valve internal combustion engine piston to solve the above-described problems in the background art.

Disclosure of Invention

The utility model aims to solve the problems that in the prior art, a piston skirt plays a role in guiding the reciprocating motion of a piston in a cylinder and bears lateral pressure, the piston is easy to be blocked in the cylinder after the piston skirt is heated, expanded and deformed, the top of the piston is one of the components of a combustion chamber and mainly bears the pressure of combustion gas, the internal space is limited, the combustion is insufficient and the integral operation is influenced, and the three-valve internal combustion engine piston is provided.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the three-valve internal combustion engine piston comprises a piston skirt part, a piston head part and a piston top part, wherein the piston head part is arranged at the upper end of the piston skirt part, and the piston top part is arranged at the upper end of the piston head part;

the piston comprises a piston skirt, wherein piston pin seats are formed in two sides of the upper part of the piston skirt, first limit grooves are formed in the piston pin seats, piston pins are connected in the piston pin seats, second limit grooves are formed in two sides of the outer part of each piston pin, limit rings are connected in the second limit grooves, movable grooves are formed in the lower end of the piston skirt, close to the front face and the back face, of each piston skirt, and steel sheets are connected to the inner wall of the piston skirt;

a plurality of groups of ring grooves are arranged outside the piston head, and a gas ring and an oil ring are connected in the ring grooves;

the upper end of the top of the piston is provided with a plurality of groups of limiting protrusions near the edge, and the middle of the upper end of the top of the piston is provided with a limiting groove.

As a preferable scheme of the utility model, the piston skirt, the piston head and the piston top are of an integrated structure.

As a preferable scheme of the utility model, the gas ring and the oil ring are sleeved in the ring groove.

As a preferable scheme of the utility model, the limiting rings are sleeved in the first limiting groove and the second limiting groove, and the piston pin is inserted in the piston pin seat.

As a preferable scheme of the utility model, the steel sheet is embedded on the inner wall of the skirt part.

As a preferable scheme of the utility model, a plurality of groups of limit protrusions are distributed in an annular equidistant manner, and the middle of each limit groove is provided with a protrusion structure.

In summary, the technical effects and advantages of the present utility model are: the three-valve internal combustion engine piston is characterized in that a steel sheet is embedded on the inner wall of a piston skirt, the steel sheet with a low expansion coefficient is embedded on the inner wall of the piston skirt with a high expansion coefficient, the thermal expansion amount of the piston skirt is reduced, the steel sheet is connected with the piston skirt, the thermal expansion deformation amount of a piston pin seat and the piston skirt is restrained, the lower end of the piston skirt is provided with a movable groove, the whole weight is lightened, the inertia force is reduced, the thermal deformation amount near the piston pin seat is reduced, the piston skirt has good elasticity and small mass, the fit clearance between a piston and a cylinder is small, the limiting groove can improve the flow performance of mixed gas, improve the combustion process, and the valve lift is increased and the valve top is prevented from being bumped.

Drawings

FIG. 1 is an overall block diagram of the present utility model;

FIG. 2 is a cross-sectional structural view of the present utility model;

fig. 3 is a split structure diagram of the present utility model.

In the figure: 1. a piston skirt; 101. a movable groove; 102. a piston pin boss; 103. a first limit groove; 2. a piston pin; 201. the second limit groove; 3. a piston head; 301. a ring groove; 4. a piston top; 401. a limit protrusion; 402. a limit groove; 5. a steel sheet; 6. a gas ring; 7. an oil ring; 8. and a limiting ring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1-3, a three-valve internal combustion engine piston comprises a piston skirt 1, a piston head 3 and a piston top 4, wherein the piston head 3 is arranged at the upper end of the piston skirt 1, and the piston top 4 is arranged at the upper end of the piston head 3; the piston skirt 1 is provided with piston pin seats 102 on two sides at the upper part, first limit grooves 103 are formed in the piston pin seats 102, piston pins 2 are connected in the piston pin seats 102, second limit grooves 201 are formed in two sides outside the piston pins 2, limit rings 8 are connected in the second limit grooves 201, movable grooves 101 are formed in the positions, close to the front face and the back face, of the lower end of the piston skirt 1, and steel sheets 5 are connected on the inner wall of the piston skirt 1; the outside of the piston head 3 is provided with a plurality of groups of ring grooves 301, and the ring rings 6 and the oil rings 7 are connected with the ring grooves 301; a plurality of groups of limiting protrusions 401 are arranged at the upper end of the piston top 4 near the edge, and a limiting groove 402 is arranged in the middle of the upper end of the piston top 4.

Referring to fig. 1, 2 and 3, the piston skirt plays a guiding role on the reciprocating motion of the piston in the cylinder and bears lateral pressure, the piston is easy to be blocked in the cylinder after the piston skirt is heated and expanded and deformed, the gas ring 6 and the oil ring 7 are sleeved in the ring groove 301, the limiting ring 8 is sleeved in the first limiting groove 103 and the second limiting groove 201, the piston pin 2 is inserted in the piston pin seat 102, the piston skirt 1, the piston head 3 and the piston top 4 are of an integrated structure, the steel sheet 5 is embedded on the inner wall of the piston skirt 1, the steel sheet 5 with low expansion coefficient is embedded on the inner wall of the piston skirt 1 with high expansion coefficient, the thermal expansion amount of the piston skirt 1 is reduced, the steel sheet 5 is connected with the piston skirt 1, the thermal expansion deformation amount of the piston pin seat 102 and the piston skirt 1 is restrained, the movable groove 101 arranged at the lower end of the piston skirt 1 is reduced, the whole weight is lightened, the inertia force is reduced, the amount near the piston pin seat 102 is reduced, the elasticity of the piston skirt 1 is good, the mass is small, and the fit clearance between the piston and the cylinder is small.

Referring to fig. 1 and 3, the top of the piston is one of the components of the combustion chamber, mainly bears the pressure of combustion gas, has limited internal space, is insufficient in combustion, affects the overall operation, and has a plurality of groups of limiting protrusions 401 distributed in an annular equidistant manner, the middle of each limiting groove 402 is in a protruding structure, and each limiting groove 402 can improve the flow performance of the mixed gas, improve the combustion process, and is beneficial to increasing the valve lift and preventing the top of the piston from touching the valve.

Working principle: the gas ring 6 and the oil ring 7 of the piston of the three-valve internal combustion engine are sleeved in the ring groove 301, the limiting ring 8 is sleeved in the first limiting groove 103 and the second limiting groove 201, the piston pin 2 is inserted in the piston pin seat 102, the piston skirt 1, the piston head 3 and the piston top 4 are of an integrated structure, the steel sheet 5 is embedded on the inner wall of the piston skirt 1, the steel sheet 5 with low expansion coefficient is embedded on the inner wall of the piston skirt 1 with high expansion coefficient, the thermal expansion amount of the piston skirt 1 is reduced, the steel sheet 5 is connected with the piston skirt 1, the thermal expansion deformation amount of the piston pin seat 102 and the piston skirt 1 is restrained, the movable groove 101 arranged at the lower end of the piston skirt 1 lightens the whole weight, so that inertia force is reduced, the thermal deformation amount near the piston pin seat 102 is reduced, the piston skirt 1 has good elasticity and small mass, the matching gap between a piston and a cylinder is small, a plurality of groups of limiting bulges 401 are distributed in an annular equidistant mode, the middle of the limiting grooves 402 are of a bulge structure, the limiting grooves 402 can improve the flow performance of mixed gas, improve the combustion process, and are beneficial to increasing the valve top collision.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Three valve internal combustion engine piston, including piston skirt (1), piston head (3) and piston top (4), its characterized in that: the upper end of the piston skirt (1) is provided with a piston head (3), and the upper end of the piston head (3) is provided with a piston top (4);

piston pin seats (102) are formed in two sides of the upper portion of the piston skirt (1), first limit grooves (103) are formed in the piston pin seats (102), piston pins (2) are connected in the piston pin seats (102), second limit grooves (201) are formed in two outer sides of each piston pin (2), limit rings (8) are connected in the second limit grooves (201), movable grooves (101) are formed in the positions, close to the front face and the back face, of the lower end of the piston skirt (1), and steel sheets (5) are connected to the inner wall of the piston skirt (1);

a plurality of groups of ring grooves (301) are arranged outside the piston head (3), and a gas ring (6) and an oil ring (7) are connected in the plurality of groups of ring grooves (301);

a plurality of groups of limiting protrusions (401) are arranged at the upper end of the piston top (4) close to the edge, and a limiting groove (402) is formed in the middle of the upper end of the piston top (4).

2. The three-valve internal combustion engine piston according to claim 1, wherein: the piston skirt (1), the piston head (3) and the piston top (4) are of an integrated structure.

3. The three-valve internal combustion engine piston according to claim 1, wherein: the gas ring (6) and the oil ring (7) are sleeved in the ring groove (301).

4. The three-valve internal combustion engine piston according to claim 1, wherein: the limiting rings (8) are sleeved in the first limiting grooves (103) and the second limiting grooves (201), and the piston pins (2) are inserted in the piston pin seats (102).

5. The three-valve internal combustion engine piston according to claim 1, wherein: the steel sheet (5) is embedded on the inner wall of the piston skirt (1).

6. The three-valve internal combustion engine piston according to claim 1, wherein: the limiting protrusions (401) are distributed in an annular equidistant mode, and the middle of each limiting groove (402) is of a protruding structure.