CN110779700A - Piston excircle wear test device - Google Patents
Piston excircle wear test device Download PDFInfo
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- CN110779700A CN110779700A CN201911102006.9A CN201911102006A CN110779700A CN 110779700 A CN110779700 A CN 110779700A CN 201911102006 A CN201911102006 A CN 201911102006A CN 110779700 A CN110779700 A CN 110779700A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- Testing Of Engines (AREA)
Abstract
The invention discloses a piston excircle abrasion test device, which comprises: a support body; the piston cylinder is used for mounting the test piston and is arranged on the support body; the crankshaft connecting rod assembly is used for driving the test piston to reciprocate; the cylinder pressure assembly is used for applying cylinder pressure to the test piston; and a power source component for powering the crankshaft connecting rod assembly and the cylinder pressure assembly. According to the piston excircle abrasion test device provided by the invention, the test piston is supported by the piston cylinder, the crankshaft connecting rod assembly is used for driving the test piston to reciprocate, the cylinder pressure assembly is used for simulating the cylinder pressure load of the internal combustion engine, the crankshaft connecting rod assembly and the cylinder pressure assembly are connected with the same power source component, the applied inertia force load and the cylinder pressure load of the internal combustion engine can be synchronously simulated, and the test accuracy is improved; the device can carry out the wear individual test of piston excircle, provides the basis for the design of piston excircle circular curve optimal design and contrast design, and the device simple structure, the experiment is with low costs, the cycle is short.
Description
Technical Field
The invention relates to the field of piston excircle detection equipment, in particular to a piston excircle abrasion test device.
Background
After the emission is upgraded, the requirements of the engine oil consumption and the friction loss of the internal combustion engine are further improved, in order to reduce the oil consumption and the abrasion, the verification of the engine oil consumption and the friction loss is generally carried out by utilizing a piston excircle abrasion test device, the piston excircle design which is beneficial to reducing the engine oil consumption and the friction loss is realized, and the power and the economical efficiency of the internal combustion engine are improved.
In the prior art, piston excircle wear test generally utilizes internal-combustion engine bench test to accomplish, however, adopts and carries out piston excircle wear test in the current internal-combustion engine bench test, and is with high costs, and the cycle length leads to the test cost to rise.
Therefore, how to improve the efficiency of the piston outer circle abrasion test device is a technical problem to be solved by the technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a piston excircle abrasion test device which can efficiently perform a single test of piston excircle abrasion, and has the advantages of simple structure, low test cost and short period.
In order to achieve the purpose, the invention provides the following technical scheme:
a piston outer circle wear test device, comprising:
a support body;
the piston cylinder is used for mounting a test piston and is arranged on the support body;
the crankshaft connecting rod assembly is used for driving the test piston to reciprocate;
a cylinder pressure assembly for applying cylinder pressure to the test piston;
and a power source component for powering the crankshaft connecting rod assembly and the cylinder pressure assembly.
Preferably, the crankshaft connecting rod component comprises a crankshaft with variable crank radius and a connecting rod component arranged between the crankshaft and the test piston; one end of the crankshaft is connected with the power source component.
Preferably, the cylinder pressure assembly comprises an elastic pressure plate arranged at the top of the test piston, and a cam matched with the surface of the elastic pressure plate, wherein the cam applies pressure to the elastic pressure plate in the rotating process.
Preferably, the cylinder pressure assembly further includes a cam shaft for supporting the cam, and a mechanical transmission member for transmitting power of the power member to the cam shaft.
Preferably, the power source assembly further comprises an L-shaped assembly table, the power source assembly and the support body are both mounted on the horizontal edge of the L-shaped assembly table, one end of the cam shaft penetrates through the support body, and the other end of the cam shaft is mounted on the vertical edge of the L-shaped assembly table.
Preferably, the elastic pressing plate comprises a first pressing plate, a second pressing plate and a spring positioned between the first pressing plate and the second pressing plate, the cam can be abutted against the first pressing plate, and the second pressing plate is positioned at the top of the test piston.
Preferably, an oil injection part for supplying lubricating oil to the test piston is further arranged in the support main body.
Preferably, the power source component is a servo motor.
Preferably, the outer wall of the piston cylinder is also provided with a heater.
The invention provides a piston excircle abrasion test device, comprising: a support body; the piston cylinder is used for mounting a test piston and is arranged on the support body; the crankshaft connecting rod assembly is used for driving the test piston to reciprocate; a cylinder pressure assembly for applying cylinder pressure to the test piston; and a power source component for powering the crankshaft connecting rod assembly and the cylinder pressure assembly. According to the piston excircle abrasion test device provided by the invention, the test piston is supported by the piston cylinder, the crankshaft connecting rod assembly is used for driving the test piston to reciprocate, the cylinder pressure assembly is used for simulating the cylinder pressure load of an internal combustion engine, and the crankshaft connecting rod assembly and the cylinder pressure assembly are connected with the same power source component, so that the synchronous simulation of the applied inertia force load and the cylinder pressure load of the internal combustion engine can be realized on the test piston, and the test accuracy is improved; the device can carry out the wear individual test of piston excircle, provides the basis for the design of piston excircle circular curve optimal design and contrast design, and the device simple structure, the experiment is with low costs, the cycle is short.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a piston outer circle wear test device provided by the invention;
FIG. 2 is a schematic diagram of a design principle of a cam in the piston outer circle wear test device provided by the invention;
wherein: the device comprises a support body (1), a camshaft (2), a heater (3), a cylinder pressure compensation spring pressing plate (4), a piston cylinder (5), an oil injection component (6), an L-shaped device platform (7), a cam (8), a test piston (9), a connecting rod component (10), a crankshaft (11), a mechanical transmission component (12) and a power source component (13).
Detailed Description
The core of the invention is to provide a piston excircle abrasion test device, which can efficiently carry out a single test of piston excircle abrasion, and has the advantages of simple structure, low test cost and short period.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an embodiment of a piston outer circle wear test device provided in the present invention; fig. 2 is a schematic diagram of a design principle of a cam in the piston outer circle wear test device provided by the invention.
In this embodiment, the piston outer circle wear test device includes a support body 1, a piston cylinder 5, a crankshaft connecting rod assembly, a cylinder pressure assembly, and a power source component 13, and the power source component 13 is preferably a servo motor.
The support body 1 is used for supporting components such as a piston cylinder 5, the piston cylinder 5 can be fixedly arranged in the support body 1, the piston cylinder 5 is used for installing a test piston 9, and the test piston 9 can reciprocate in the piston cylinder 5 to carry out an abrasion test; the crankshaft connecting rod assembly is used for driving the test piston 9 to reciprocate; the cylinder pressure assembly is used for applying cylinder pressure to the test piston 9, namely simulating the application of cylinder pressure load of the internal combustion engine; the power source component 13 is used to power the crankshaft connecting rod assembly and the cylinder pressure assembly.
According to the piston excircle abrasion test device provided by the invention, the test piston 9 is supported by the piston cylinder 5, the crankshaft connecting rod assembly is used for driving the test piston 9 to reciprocate, the cylinder pressure assembly is used for simulating the cylinder pressure load of an internal combustion engine, and the crankshaft connecting rod assembly and the cylinder pressure assembly are connected with the same power source component 13, so that the synchronous simulation of the applied inertia force load and the cylinder pressure load of the internal combustion engine can be realized on the test piston 9, and the test accuracy is improved; the device can carry out the wear individual test of piston excircle, provides the basis for the design of piston excircle circular curve optimal design and contrast design, and the device simple structure, the experiment is with low costs, the cycle is short.
Further, the crankshaft connecting rod component comprises a crankshaft 11 and a connecting rod component 10, wherein the crankshaft 11 is the crankshaft 11 with the variable crank radius, the connecting rod component 10 is arranged between the crankshaft 11 and the test piston 9, one end of the connecting rod component 10 is sleeved at the position of the variable diameter of the crankshaft 11, the other end of the connecting rod component is hinged with the bottom of the test piston 9, the connecting rod component 10 is used for transmitting the rotation of the crankshaft 11 to the test piston 9 and converting the rotation of the crankshaft 11 into the reciprocating movement of the test piston 9, one end of the crankshaft 11 is connected with a power source component 13, and the crankshaft 11 can rotate along with the power source component 13.
On the basis of the above embodiments, the cylinder pressure assembly comprises an elastic pressure plate arranged on the top of the test piston 9 and a cam 8 matched with the surface of the elastic pressure plate, wherein the cam 8 applies pressure to the elastic pressure plate during rotation, and the cam 8 is used for simulating the application of the cylinder pressure load of the internal combustion engine to the test piston 9.
Further, the cylinder pressure assembly further includes a camshaft 2 for supporting the cam 8, and a mechanical transmission member 12 for transmitting power of the power member to the camshaft 2. Specifically, one end of the mechanical transmission part 12 is connected with an output shaft of the servo motor, and the other end of the mechanical transmission part is connected with the camshaft 2, and the mechanical transmission part 12 can transmit the rotation of the output shaft of the servo motor to the camshaft 2. More specifically, the mechanical transmission member 12 may be implemented by two sets of gear transmissions.
On the basis of the above embodiments, the camshaft device further comprises an L-shaped device platform 7, the power source component 13 and the support body 1 are both installed on the horizontal edge of the L-shaped device platform 7, one end of the camshaft 2 penetrates through the support body 1, and the other end of the camshaft is installed on the vertical edge of the L-shaped device platform 7. The L-shaped mounting base 7 can improve the stability of the camshaft 2.
In addition to the above embodiments, the elastic pressing plate includes a first pressing plate, a second pressing plate, and a spring located between the first pressing plate and the second pressing plate, and constitutes the cylinder pressure compensation spring pressing plate 4, the cam 8 may abut against the first pressing plate, and the second pressing plate is located on the top of the test piston 9.
In addition to the above embodiments, an oil injection member 6 for supplying lubricating oil to the test piston 9 is further provided in the support body, so as to lubricate the test piston 9.
In addition to the above embodiments, the heater 3 is further provided on the outer wall of the piston cylinder 5. Specifically, the heater 3 is preferably arranged on the outer wall of the upper section of the piston cylinder 5, and a constant thermal load is loaded in the test to simulate the actual use environment of the piston.
Further, since the present embodiment provides a test apparatus in which the cam 8 is a non-standard cam 8, i.e. a cam 8 of standard size not used on the market, its profile design and its selection and cooperation with the cylinder pressure compensating spring plate 4 determine the pressure profile of the cylinder pressure compensating spring plate 4 exerted on the top surface of the test piston 9. Fig. 2 is a mechanism schematic diagram of cylinder pressure curve simulation.
The cam 8 profile design method comprises the following steps:
in a four-stroke internal combustion engine, the transmission ratio of the mechanical transmission part 12 is 2:1, so that the rotation period of the non-standard cam 8 is 2 times of the reciprocating period of the test piston 9, and the lower limit point of the profile of the non-standard cam 8 in the calibration graph 2 is the initial intake point of the internal combustion engine, and the test piston 9 is at the top dead center. Setting the radius of the non-standard cam 8 at the lower limit point as R0, setting the radius of the non-standard cam 8 at a certain angle as R0+ Δ R, and setting Δ R as a radius drop; meanwhile, a coordinate system is established, the position of the test piston 9 at the top dead center is marked as a point 0, and other optional positions are marked as x, so that the displacement formula of the test piston 9 is as follows
Wherein r is the crank radius, α is the crank angle, λ is the ratio of the crank radius to the length of the connecting rod, and then according to Hooke's law, the spring pressure formula in the cylinder pressure compensating spring pressure plate 4 is F
Press and pressK is the spring constant of the spring, Δ L is the spring compression length, and Δ L is R-R0-x, which can be calculated from the relative movement. The spring pressure simulating the cylinder pressure load, i.e.
Wherein P is the cylinder pressure, S is the radial cross-sectional area of the piston, and D is the cylinder diameter of the piston, thereby
After transformation
The full-circumference profile of the non-standard cam 8 can be designed according to the selected cylinder pressure curve of the engine, the radius of a crank, the length of a connecting rod, the diameter of a piston cylinder and the elastic coefficient of a pressure spring.
Specifically, according to the piston excircle wear test device provided by this embodiment, the servo motor outputs a corresponding rotation speed according to a required characteristic parameter of the internal combustion engine, drives the crankshaft 11 with a variable crank radius to rotate, and then drives the test piston 9 to reciprocate up and down through transmission of the connecting rod component 10, so as to form a reciprocating inertia force of the test piston 9. Meanwhile, the output shaft of the servo motor is transmitted to the cam shaft 2 through the mechanical transmission part 12, so that the cam 8 is driven to rotate, the cylinder is jacked to press the compensation elastic pressing plate in the rotating process of the cam 8, and pressure load is further formed to be applied to the top surface of the test piston 9. In this way, the inertia force load and the internal combustion engine cylinder pressure load can be synchronously simulated and applied to the test piston 9.
According to the piston excircle wear test device provided by the embodiment, when a certain part of a test piston is seriously worn, the design size of the part to be reduced should be adjusted, and the device not only can be used for the later-stage optimization design and verification of the excircle line of the piston, but also can be used for the test and guidance of the earlier-stage design of the excircle line of the piston; the mechanism is simple, the cost is low, and the realization is easy; the test period is short, and the anti-interference performance is high.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The piston excircle wear test device provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a piston excircle wear test device which characterized in that includes:
a support body (1);
the piston cylinder (5) is used for installing a test piston (9), and the piston cylinder (5) is arranged on the support body (1);
the crankshaft connecting rod assembly is used for driving the test piston (9) to reciprocate;
a cylinder pressure assembly for applying cylinder pressure to the test piston (9);
and a power source component (13) for powering the crankshaft connecting rod assembly and the cylinder pressure assembly.
2. Piston cylindrical wear test device according to claim 1, characterized in that the crankshaft connecting rod assembly comprises a crankshaft (11) of variable crank radius, a connecting rod part (10) arranged between the crankshaft (11) and the test piston (9); one end of the crankshaft (11) is connected with the power source component (13).
3. The piston cylindrical wear test device according to claim 1, characterized in that the cylinder pressure assembly comprises an elastic pressure plate arranged on the top of the test piston (9), and a cam (8) matched with the surface of the elastic pressure plate, wherein the cam (8) applies pressure to the elastic pressure plate during rotation.
4. The piston cylindrical wear test device according to claim 3, characterized in that the cylinder pressing assembly further comprises a camshaft (2) for supporting the cam (8), and a mechanical transmission member (12) for transmitting the power of the power member to the camshaft (2).
5. The piston excircle wear test device according to claim 4, characterized by further comprising an L-shaped device platform (7), wherein the power source component (13) and the support body (1) are both installed on the horizontal side of the L-shaped device platform (7), one end of the camshaft (2) penetrates through the support body (1), and the other end is installed on the vertical side of the L-shaped device platform (7).
6. The piston cylindrical wear test device according to claim 3, characterized in that the elastic pressure plate comprises a first pressure plate, a second pressure plate and a spring between the first pressure plate and the second pressure plate, the cam (8) can be abutted with the first pressure plate, and the second pressure plate is located on top of the test piston (9).
7. Piston cylindrical wear test device according to claim 1, characterized in that an oil injection part (6) for supplying lubricating oil to the test piston (9) is also provided in the support body.
8. The piston outer circle wear test device according to claim 1, characterized in that the power source component (13) is a servo motor.
9. The piston cylindrical wear test device according to any one of claims 1 to 8, characterized in that the outer wall of the piston cylinder (5) is further provided with a heater (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911102006.9A CN110779700A (en) | 2019-11-12 | 2019-11-12 | Piston excircle wear test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911102006.9A CN110779700A (en) | 2019-11-12 | 2019-11-12 | Piston excircle wear test device |
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| CN110779700A true CN110779700A (en) | 2020-02-11 |
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| CN201911102006.9A Pending CN110779700A (en) | 2019-11-12 | 2019-11-12 | Piston excircle wear test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2618669A (en) * | 2022-04-12 | 2023-11-15 | Univ Harbin Eng | Jet experiment bench for measurement of temperature field of engine piston |
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Application publication date: 20200211 |