CN219691639U - Long-piston short-connecting rod mechanism for reciprocating piston type internal combustion engine - Google Patents
Long-piston short-connecting rod mechanism for reciprocating piston type internal combustion engine Download PDFInfo
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- CN219691639U CN219691639U CN202321429385.4U CN202321429385U CN219691639U CN 219691639 U CN219691639 U CN 219691639U CN 202321429385 U CN202321429385 U CN 202321429385U CN 219691639 U CN219691639 U CN 219691639U
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- piston
- connecting rod
- combustion engine
- internal combustion
- connecting portion
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 39
- 238000009434 installation Methods 0.000 claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 7
- 239000000446 fuel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The utility model discloses a long-piston short-connecting rod mechanism for a reciprocating piston type internal combustion engine, which comprises a piston and a connecting rod, wherein the piston comprises a piston ring installation part and a piston connecting part integrally connected with the bottom of the piston ring installation part, one end of the piston connecting part, which is far away from the piston ring installation part, is provided with an installation groove for connecting the connecting rod, a small end of the connecting rod is arranged in the installation groove and is connected with a pin of the piston connecting part, a large end of the connecting rod is connected with a journal of a crankshaft, the length of the connecting rod is greater than or equal to 85 percent of piston stroke and less than or equal to 115 percent of piston stroke, and the size of the piston connecting part is required to ensure that the internal combustion engine can freely pass through between two crankshaft balance blocks when in operation. Compared with the traditional internal combustion engine, the internal combustion engine has higher working efficiency and saves more oil.
Description
Technical Field
The utility model relates to the technical field of internal combustion engines, in particular to a long-piston short-connecting rod mechanism for a reciprocating piston type internal combustion engine.
Background
Most of the fuel supplied by modern reciprocating piston internal combustion engines burns near the top dead center, the cylinder pressure rises sharply and reaches a maximum value rapidly near the top dead center, and although the fuel gas pressure is very high at the moment, the piston just passes over the top dead center, the corresponding arm coefficient of torque formed by the connecting rod and the crankshaft is very small, so that the combustion pressure cannot be effectively converted into the torque of the crankshaft. As the piston descends, the working volume of the cylinder increases, the losses of heat transfer, friction and the like increase, the pressure in the cylinder rapidly decreases, so that the gas working capacity is greatly reduced, and the maximum heat efficiency of the traditional internal combustion engine is difficult to exceed 60 percent due to the fact that most of heat energy which can be used for working work is irreversibly lost due to the fact that the gas pressure is reduced too much while the force arm coefficient is increased along with the descending of the piston.
Disclosure of Invention
The utility model aims to provide a long-piston short-connecting rod mechanism for a reciprocating piston type internal combustion engine, which reduces the pressure of fuel gas in a cylinder when an output force arm of the internal combustion engine is in a larger range of values compared with the traditional internal combustion engine by shortening the length of a connecting rod, thereby achieving the purposes of improving the heat efficiency of the internal combustion engine and saving fuel oil.
In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows:
the long-piston short-connecting rod mechanism for reciprocating piston internal combustion engine includes piston and connecting rod, the piston includes piston ring installation portion and piston connecting portion integrally connected with bottom of the piston ring installation portion, one end of the piston connecting portion far away from the piston ring installation portion is equipped with mounting groove for connecting the connecting rod, the small end of the connecting rod is placed in the mounting groove and is pin-connected with the connecting portion of the piston, the large end of the connecting rod is connected with journal of crankshaft, the length of the connecting rod is greater than or equal to 85% of piston stroke, and less than or equal to 115% of piston stroke, and the size of the connecting portion of the piston should ensure that when the internal combustion engine is working, the connecting rod can freely pass between two crankshaft counterweights.
Preferably, the length of the connecting rod is equal to the stroke of the piston.
As one preferable mode, piston pin holes penetrating into the mounting grooves are formed in two sides of the piston connecting portion, the small connecting rod ends are connected with the piston connecting portion through piston pins arranged in the piston pin holes, the piston pins are in interference tight fit with the piston pin holes, and the small connecting rod ends are in sliding fit with the piston pins.
The principle of the utility model is as follows:
compared with the traditional internal combustion engine, the length of the connecting rod is shortened, and when the internal combustion engine works in a large range of the output force arm and the output force arm of the internal combustion engine are the same, the descending distance of the working piston of the traditional internal combustion engine is larger than that of the working piston of the internal combustion engine after improvement. So that the volume of the cylinder of the internal combustion engine after the improvement is smaller than that of the cylinder of the traditional internal combustion engine, the force acting on the crankshaft in the state after the improvement is larger than that acting on the crankshaft before the improvement, and the gas pressure in the cylinder is further converted into the output torque of the crankshaft of the internal combustion engine.
The utility model has the beneficial effects that: compared with the traditional internal combustion engine, the internal combustion engine has higher working efficiency and saves more oil.
Drawings
FIG. 1 is a schematic diagram of an application structure of a long-piston short-link mechanism according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of the working structure of a prior art internal fuel;
fig. 3 is a schematic diagram of the working structure of an internal combustion engine to which the long piston and short connecting rod mechanism of the present utility model is applied.
The figure shows:
1-a piston; 2-a piston ring mounting portion; 3-an arc surface; 4-cross section; 5-a crankshaft balance block; 6-a mounting groove; 7-piston pin holes; 8-connecting rod small end; 9-a piston pin; 10-connecting rod big end; 11-journal; 12-a crankshaft; 13-piston connection.
Detailed Description
The technical solutions in the embodiments of the present utility model are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
As shown in fig. 1, a long-piston short-connecting rod mechanism for a reciprocating piston type internal combustion engine according to an embodiment of the present utility model includes a piston 1 and a connecting rod, the piston 1 includes a piston ring mounting portion 2 and a piston connecting portion 13 integrally connected to the bottom of the piston ring mounting portion 2, one end of the piston connecting portion 13, which is far away from the piston ring mounting portion 2, is provided with a mounting groove 6 for connecting the connecting rod, a small end 8 of the connecting rod is disposed in the mounting groove 6 and is in pin connection with the piston connecting portion 13, a large end 10 of the connecting rod is connected with a journal 11 of a crankshaft 12, the length of the connecting rod is equal to the stroke of the piston, and the size of the piston connecting portion 13 is such that the internal combustion engine can freely pass through between two crankshaft weights 5 when operating.
In the present embodiment, the side surface of the piston connecting portion 13 is formed by the arc surface 3 and the cross section 4, and the dimension between the outer sides of the two cross sections 4 should be smaller than the dimension between the inner sides of the two crankshaft counterweights 5, so that the piston connecting portion 13 can be ensured to freely pass through between the two crankshaft counterweights 5 when the internal combustion engine is in operation. The cross section 4 part of the piston connecting part 13 is provided with a piston pin hole 7 penetrating into the mounting groove 6, the small connecting rod head 8 is connected with the piston connecting part 13 through a piston pin 9 arranged in the piston pin hole 7, the piston pin 9 is in interference tight fit with the piston pin hole 7, and the small connecting rod head 8 is in sliding fit with the piston pin 9.
The specific test:
as shown in FIG. 3, the experimental principle model machine adopts a domestic 170F single-cylinder air-cooled diesel engine, the cylinder diameter is 70mm, the piston stroke is 75mm, and the length of a crankshaft connecting rod is 132mm. As a comparison, 5 principle prototypes were designed, the links of which were shortened to 86.25mm, 81mm, 75mm, 69mm and 63.75mm, respectively.
Bench tests were performed on 6 diesel engines, respectively, and test data were recorded. As shown in fig. 3, a detailed description of the operation of the internal combustion engine is given by taking a principle prototype with a connecting rod length of 75mm as an example, and the dimensions marked in the drawing are the actual dimensions of the principle prototype and the prototype parts. After the working stroke starts, when the maximum force arm coefficient of 37.5mm is formed between the connecting rod and the crankshaft of the principle prototype and the prototype respectively, the piston descending size of the prototype reaches 32.277mm, and the piston descending size of the novel internal combustion engine piston connecting rod mechanism is only 28.647mm because of shortened connecting rod, and the piston descending is reduced by 3.63mm.
The fuel consumption data for several groups of tests are shown in the following table, in which the length of the connecting rod is used as a parameter for distinguishing the tests:
| test | 132mm | 86.25mm | 81mm | 75mm | 69mm | 63.75mm |
| Fuel consumption data (g/kw.h) | 289.7 | 232 | 230 | 229 | 231 | 226 |
Tests prove that the mechanism can be applied to an internal combustion engine to save fuel.
In addition, the junction of all parts in the novel internal-combustion engine piston connecting rod mechanism in 5 sets of comparative experiments can realize low minor face contact structure, accords with the design requirement that the internal-combustion engine driving medium possesses shock resistance and wearability and is good, and the principle model machine is through dismantling the inspection after running through the load of a plurality of hours, and novel internal-combustion engine piston connecting rod mechanism does not appear unusual wearing and tearing.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (3)
1. The utility model provides a long piston short link mechanism that reciprocating piston internal-combustion engine used, including piston (1) and connecting rod, its characterized in that, piston (1) include piston ring installation department (2) and with piston ring installation department (2) bottom body coupling's piston connecting portion (13), piston connecting portion (13) keep away from one end of piston ring installation department (2) and offer mounting groove (6) that are used for connecting the connecting rod, connecting rod tip (8) are arranged in mounting groove (6) and with piston connecting portion (13) pin connection, connecting rod tip (10) link to each other with journal (11) of bent axle (12), the length of connecting rod is greater than or equal to 85% piston stroke, and is less than or equal to 115% piston stroke, the size of piston connecting portion (13) should be guaranteed that the internal-combustion engine during operation can freely pass between two bent axle balancing piece (5).
2. The long piston short link mechanism of claim 1 wherein the length of the link is equal to the stroke of the piston.
3. The long-piston short-connecting rod mechanism according to claim 1, characterized in that piston pin holes (7) penetrating into the mounting grooves (6) are formed in two sides of the piston connecting portion (13), the small connecting rod ends (8) are connected with the piston connecting portion (13) through piston pins (9) mounted in the piston pin holes (7), the piston pins (9) are in interference tight fit with the piston pin holes (7), and the small connecting rod ends (8) are in sliding fit with the piston pins (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321429385.4U CN219691639U (en) | 2023-06-06 | 2023-06-06 | Long-piston short-connecting rod mechanism for reciprocating piston type internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321429385.4U CN219691639U (en) | 2023-06-06 | 2023-06-06 | Long-piston short-connecting rod mechanism for reciprocating piston type internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219691639U true CN219691639U (en) | 2023-09-15 |
Family
ID=87937701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321429385.4U Active CN219691639U (en) | 2023-06-06 | 2023-06-06 | Long-piston short-connecting rod mechanism for reciprocating piston type internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219691639U (en) |
-
2023
- 2023-06-06 CN CN202321429385.4U patent/CN219691639U/en active Active
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