CN209818171U

CN209818171U - Piston connecting rod device with variable compression ratio

Info

Publication number: CN209818171U
Application number: CN201920438834.9U
Authority: CN
Inventors: 李岳
Original assignee: Shanghai Wisdom Power Technology Co Ltd
Current assignee: Shanghai Wisdom Power Technology Co Ltd
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2019-12-20
Anticipated expiration: 2029-04-02

Abstract

The utility model provides a compression ratio variable piston connecting rod device in internal-combustion engine technical field, includes piston, connecting rod lid, bottom plate, big elastic element, arc backing plate, little elastic element, baffle, retaining ring, bottom plate, big elastic element, arc backing plate, little elastic element, baffle equipartition are arranged in the inboard cavity of piston skirt portion, the bottom plate is close to the piston top at the innermost, little elastic element arranges with big elastic element with one heart and is located between bottom plate and the arc backing plate, the arc backing plate is in the same place with the upper end contact of connecting rod. In the utility model, when the explosion pressure in the cylinder is larger, the piston can properly descend under the action of the large and small elastic elements; when the explosion pressure in the cylinder is small, the piston can properly move upwards under the action of the large elastic element and the small elastic element, so that the variable compression ratio is realized. The utility model relates to a rationally, simple structure can realize the nimble control of engine, realizes the initiative control of jar implosion pressure through variable compression ratio.

Description

Piston connecting rod device with variable compression ratio

Technical Field

The utility model relates to a piston rod device in the technical field of internal-combustion engines, in particular to a variable compression ratio piston rod device which can realize flexible control of an engine.

Background

An internal combustion engine is a power machine, which is a heat engine that directly converts heat energy released by burning fuel inside the machine into power. The internal combustion engine in the broad sense includes not only reciprocating piston, rotary piston and free piston engines but also jet engines of the rotary vane type, but the internal combustion engine is generally referred to as a piston engine. Piston type internal combustion engines, which are the most common in the past, mix fuel and air and burn in their cylinders, and the released heat energy causes the cylinders to produce high-temperature and high-pressure gas. The gas expands to push the piston to do work, and then the mechanical work is output through a crank-link mechanism or other mechanisms to drive the driven machinery to work. Diesel engines and gasoline engines are common, and convert internal energy into mechanical energy.

With the increasing requirements for environmental protection and energy saving, the variable compression ratio technology is a trend in the development of internal combustion engines. The compression ratio is one of the main parameters of engine design, which affects both the engine efficiency and the maximum explosion pressure, and a military diesel engine with high explosion pressure must be optimally designed. From the existing research, the different operating modes of the engine have different requirements on the compression ratio, the efficiency of the engine can be improved by improving the compression ratio under the low operating mode, and the compression ratio is properly reduced to ensure the reliable work of the engine due to the limited detonation pressure bearing capacity under the high operating mode. Accordingly, the variable compression ratio technology becomes a hot spot of current engine research, and different schemes are adopted abroad to realize the variable compression ratio control technology, but the variable compression ratio control technology is difficult to be applied to actual products at present due to the complex control mechanism, poor reliability, high price and the like.

Disclosure of Invention

The utility model discloses to for military use high power density diesel engine's characteristics, provide a variable compression ratio scheme, realize the initiative control of jar implosion pressure through variable compression ratio. When the engine is in low load, the compression ratio is increased, so that the efficiency of low working conditions is improved; when the engine is in high load, when the compression pressure in the cylinder exceeds a certain value, the actual stroke is changed by pushing the piston, and the function of reducing the compression ratio is achieved, so that the constant-pressure combustion of the diesel engine under high working conditions is realized, and the reliability problem caused by overhigh detonation pressure is reduced. The research of the project provides a new variable compression ratio technology, and provides a solution for realizing flexible control of the engine and solving different working condition requirements.

The utility model is realized by the following technical proposal, the utility model comprises a piston, a connecting rod cover, a bottom plate, a large elastic element, an arc-shaped backing plate, a small elastic element, a baffle plate, a retainer ring and a groove, wherein, an air ring groove and an oil ring groove are respectively arranged on the outer surface of the upper end of the piston, the lower end of the connecting rod is connected with the connecting rod cover by a bolt, the inner side cavity of the skirt part of the piston is of a step structure, the cross section of the upper step department is smaller, and the cross section of the lower step; the cross section of the bottom plate is of a circular structure, and the cross sections of the large elastic element and the small elastic element are of circular ring structures; the bottom plate, the large elastic element, the arc-shaped base plate, the small elastic element and the baffle are all arranged in the inner side cavity of the piston skirt, the bottom plate is closest to the top of the piston at the innermost part, the small elastic element and the large elastic element are concentrically arranged and are positioned between the bottom plate and the arc-shaped base plate, the arc-shaped base plate is contacted with the upper end of the connecting rod, the outer edge of the upper end of the connecting rod is fixed with the outer edge of the arc-shaped base plate through the baffle, the groove is arranged on the wall surface of a lower step of the inner side cavity of the piston skirt; the upper end of the connecting rod connected with the arc-shaped base plate adopts a spherical surface design.

Further, in the present invention, the number of the gas ring grooves of the outer surface of the upper end of the piston is two, and the number of the oil ring grooves is one.

Furthermore, the utility model discloses in, bottom plate, big elastic element, little elastic element arrange in the upper step of the inboard cavity of piston skirt portion, arc backing plate, baffle, retaining ring are put in the lower step of the inboard cavity of piston skirt portion.

Furthermore, in the present invention, the top of the piston and the arc-shaped pad have symmetrically-structured pits.

Furthermore, in the present invention, the number of the concave pits at the top of the piston is one, and the number of the concave pits at the top of the arc-shaped cushion plate is three.

Furthermore, in the present invention, the connecting rod and the arc-shaped backing plate are both provided with an oil cooling channel inside.

Furthermore, in the present invention, the large elastic element and the small elastic element are both disc springs.

Furthermore, in the present invention, the large elastic element and the small elastic element may be combined into a same component.

Compared with the prior art, the utility model discloses have following beneficial effect and do: the utility model relates to a rationally, simple structure realizes the initiative control of jar implosion pressure through vary compression ratio. When the engine is in low load, the compression ratio is increased, so that the efficiency of low working conditions is improved; when the engine is in high load, when the compression pressure in the cylinder exceeds a certain value, the actual stroke is changed by pushing the piston, and the function of reducing the compression ratio is achieved, so that the constant-pressure combustion of the diesel engine under high working conditions is realized, and the reliability problem caused by overhigh detonation pressure is reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a schematic structural view of section A-A in FIG. 2;

fig. 4 is an exploded view of the present invention;

wherein: 1. the piston comprises a piston body, 2, a connecting rod, 3, a connecting rod cover, 4, a bottom plate, 5, a large elastic element, 6, an arc-shaped backing plate, 7, a small elastic element, 8, a baffle plate, 9, a retainer ring, 10 and a groove.

Detailed Description

The embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the embodiments of the present invention are based on the technical solution of the present invention and provide detailed embodiments and specific operation processes, but the scope of the present invention is not limited to the following embodiments.

Examples

Fig. 1 to 4 show the specific embodiment, the present invention includes a piston 1, a connecting rod 2, a connecting rod cap 3, a bottom plate 4, a large elastic element 5, an arc-shaped backing plate 6, a small elastic element 7, a baffle 8, a retainer ring 9 and a groove 10, wherein an air ring groove and an oil ring groove are respectively arranged on the outer surface of the upper end of the piston 1, the lower end of the connecting rod 2 is connected with the connecting rod cap 3 through a bolt, the inner cavity of the skirt part of the piston 1 is of a step structure, the cross section of the upper step door is smaller, and the cross section of the lower step part; the cross section of the bottom plate 4 is of a circular structure, and the cross sections of the large elastic element 5 and the small elastic element 7 are of circular ring structures; bottom plate 4, big elastic element 5, arc backing plate 6, little elastic element 7, 8 equipartitions of baffle are arranged in the inboard cavity of 1 skirt part of piston, bottom plate 4 is being close to the piston top at the innermost, little elastic element 7 and big elastic element 5 are arranged with one heart and are located between bottom plate 4 and arc backing plate 6, arc backing plate 6 is in the same place with the upper end contact of connecting rod 2, the upper end outward flange of connecting rod 2 passes through baffle 8 with the outward flange of arc backing plate 6 and fixes mutually, recess 10 is arranged on the lower step wall of the inboard cavity of 1 skirt part of piston, retaining ring 9 installs in recess 10 and fixed stop 8. The number of the gas ring grooves on the outer surface of the upper end of the piston 1 is two, and the number of the oil ring grooves is one. The bottom plate 4, the large elastic element 5 and the small elastic element 7 are arranged in an upper step of a cavity on the inner side of the skirt portion of the piston 1, the arc-shaped base plate 6, the baffle plate 8 and the retainer ring 9 are arranged in a lower step of the cavity on the inner side of the skirt portion of the piston 1, and pits with symmetrical structures are arranged at the tops of the piston 1 and the arc-shaped base plate 6. The upper end of the connecting rod 2 connected with the arc-shaped backing plate 6 adopts a spherical surface design, and the large elastic element 5 and the small elastic element 7 are disc springs.

The utility model discloses an in the implementation, when the engine when the high load operation, when the in-cylinder compression pressure surpassed a definite value, changed actual stroke through promoting big elastic element 5, little elastic element 7 pistons, compression ratio reduces to realize the diesel engine at the level pressure burning of high operating mode. When the engine runs at low load, the piston 1 is reset under the action of the elastic force of the large elastic element 5 and the small elastic element 7, the compression ratio is increased, and therefore the combustion efficiency under low working conditions is improved.

Claims

1. A compression ratio variable piston connecting rod device comprises a piston (1), a connecting rod (2) and a connecting rod cover (3), wherein a gas ring groove and an oil ring groove are respectively arranged on the outer surface of the upper end of the piston (1), the lower end of the connecting rod (2) is connected with the connecting rod cover (3) through a bolt, the compression ratio variable piston connecting rod device is characterized by further comprising a bottom plate (4), a large elastic element (5), an arc-shaped base plate (6), a small elastic element (7), a baffle plate (8), a retainer ring (9) and a groove (10), the inner side cavity of the skirt part of the piston (1) is of a step structure, the cross section of an upper step door is smaller, and the; the cross section of the bottom plate (4) is of a circular structure, and the cross sections of the large elastic element (5) and the small elastic element (7) are of circular ring structures; the piston comprises a bottom plate (4), a large elastic element (5), an arc-shaped base plate (6), a small elastic element (7) and a baffle plate (8), wherein the bottom plate (4) is arranged in an inner side cavity of a skirt portion of a piston (1) in a manner that the bottom plate (4) is closest to the top of the piston at the innermost side, the small elastic element (7) and the large elastic element (5) are arranged concentrically and are positioned between the bottom plate (4) and the arc-shaped base plate (6), the arc-shaped base plate (6) is contacted with the upper end of a connecting rod (2), the outer edge of the upper end of the connecting rod (2) is fixed with the outer edge of the arc-shaped base plate (6) through the baffle plate (8), a groove (10) is arranged on the lower step wall surface of the inner side cavity of the; the upper end of the connecting rod (2) connected with the arc-shaped base plate (6) adopts a spherical surface design.

2. The variable compression ratio piston connecting rod apparatus according to claim 1, wherein the number of the gas ring grooves and the number of the oil ring grooves of the outer surface of the upper end of the piston (1) are two and one.

3. The piston connecting rod device with the variable compression ratio according to claim 2 is characterized in that the bottom plate (4), the large elastic element (5) and the small elastic element (7) are arranged in an upper step of a cavity inside the skirt part of the piston (1), and the arc-shaped backing plate (6), the baffle plate (8) and the retainer ring (9) are arranged in a lower step of the cavity inside the skirt part of the piston (1).

4. A variable compression ratio piston rod assembly according to claim 3 wherein the top of the piston (1) and the arcuate shim plate (6) are provided with symmetrically configured dimples.

5. The variable compression ratio piston connecting rod apparatus according to claim 4, wherein the number of the depressions formed in the top of the piston (1) is one, and the number of the depressions formed in the top of the arc-shaped shim plate (6) is three.

6. The variable compression ratio piston connecting rod apparatus according to claim 5, wherein the connecting rod (2) and the arc shim plate (6) are provided inside with an oil cooling passage.

7. A variable compression ratio piston rod assembly according to claim 1 characterized in that said large elastic element (5) and said small elastic element (7) are disc springs.

8. The variable compression ratio piston connecting rod device according to claim 1, characterized in that the large elastic element (5) and the small elastic element (7) can be combined into one and the same component.