Test device and method for friction force of cylinder sleeve and piston assembly

A technology of piston assembly and testing device, applied in measuring devices, force/torque/work measuring instruments, instruments, etc., can solve problems such as lack of deviation between measured values ​​and actual values, and reduce the influence of tightening pressure on test results. Eliminate the interference of test results and the effect of accurate test results

Active Publication Date: 2015-04-29
DALIAN MARITIME UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the present invention, the air inlet and the air outlet are arranged on the piston, so that the high-pressure gas enters from the air inlet, exits from the air outlet, and finally acts on the back of the first air ring, the second air ring, and the contact surface of the cylinder liner. , to achieve radial loading on multiple piston rings to simulate the radial pressure on the piston rings in the ignition state; at the same time, only rely on the cylinder liner's own weight to seal the cylinder liner with the cylinder body, so that the cylinder liner is "floa

Method used

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  • Test device and method for friction force of cylinder sleeve and piston assembly
  • Test device and method for friction force of cylinder sleeve and piston assembly
  • Test device and method for friction force of cylinder sleeve and piston assembly

Examples

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Embodiment 1

[0024] A test device for the friction force of a cylinder liner and a piston assembly, the device includes a motor 1, a coupling 2, a torque sensor 3, a flywheel disc 4, a crankshaft 5, a bearing 6, a connecting rod 7, a support platform 8, and a piston pin 9 , piston 10, air intake hole 101, air outlet hole 102, first air ring 11, second air ring 12, scraper ring 13, cylinder liner 14, heating / cooling chamber 15, cylinder block 16, baffle plate 17, Friction sensor 18, air compressor 19, high pressure cylinder 20, pressure reducing valve 21, high pressure hose 22, high pressure hard pipe 23, guide rail 24, described motor 1 and cylinder body 16 are fixed on the support platform 8, described The motor 1 is connected with the crankshaft 5 through the shaft coupling 2, the torque sensor 3, the flywheel disc 4, the crankshaft 5 is fixed on the cylinder block 16 through the bearing 6, one end of the connecting rod 7 is connected with the crankshaft 5, and the connecting rod The oth...

Embodiment 2

[0026] A method utilizing the device described in Embodiment 1 to test the frictional force of the cylinder liner and the piston assembly, said method comprising the steps of:

[0027] Open the heating / cooling chamber 15, and adjust the temperature of the inner wall of the cylinder liner 14 to 70°C;

[0028] ② Turn on the motor 1, the motor 1 drives the crankshaft 5 to rotate, and the crankshaft 5 drives the connecting rod 7 to convert the rotational motion into the reciprocating motion of the piston 10;

[0029] ③ Turn on the air compressor 19, adjust the air pressure to 10MPa, so that the high-pressure gas enters from the air inlet 101 and exits from the air outlet 102, and applies radial pressure to the first air ring 11 and the second air ring 12;

[0030] ④ The friction force between the first air ring 11, the second air ring 12, the piston 10 and the cylinder liner 14 is transmitted to the friction force sensor 18 through the cylinder liner 14 for measurement.

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Abstract

The invention relates to a test device and method for friction force of a cylinder sleeve and a piston assembly, and belongs to the technical field of friction and abrasion tests. A power unit of the test device is connected with a piston through a piston pin, the piston is connected with the cylinder sleeve in a sealed mode through a first gas ring, a second gas ring and an oil scraping ring arranged in annular grooves of the piston, the cylinder sleeve is fixed to a cylinder body with a heating/cooling cavity in a sealed mode, a baffle is fixed to the cylinder body, a gap is formed between the baffle and the cylinder body, a friction force sensor is fixed in the gap between the baffle and the cylinder body, a gas supply unit is connected with a gas inlet hole of the piston, and a plurality of gas outlet holes are evenly distributed along the periphery of the piston at the position, between the annular groove I provided with the first gas ring and the annular groove II provided with the second gas ring, of the piston. The test device and method for friction force of the cylinder sleeve and the piston assembly have the advantages that the device adopts high-pressure gas to simulate fuel gas pressure, radial loading is carried out on the multiple piston rings, the restraint of mechanical radial loading to peripheral rotation of the piston rings is eliminated, and the test device and method enable the movement state of the piston rings to be more similar to that of the piston rings in an ignition state.

Description

technical field [0001] The invention relates to a device and a method for testing the friction force of a cylinder liner and a piston assembly, belonging to the technical field of friction and wear testing. Background technique [0002] At present, the research on the friction power consumption of the cylinder liner and piston assembly generally adopts the backward drag method, and this method is tested in the non-ignition state. Due to the lack of radial loading pressure on the piston ring, the measured friction power consumption is different from that under the actual working state. The difference is large. The patent "A Cylinder Liner Piston Ring Parts Friction and Wear Test Equipment" (Patent No.: ZL 200520146126.6) for radial loading of piston rings adopts disc springs to mechanically load piston rings radially, which can simulate the ignition of piston rings. However, the mechanical radial loading method limits the movement of the piston ring in the circumferential di...

Claims

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Application Information

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IPC IPC(8): G01L5/00
Inventor 徐久军单英春韩晓光沈岩刘德良朱峰金梅张凯
Owner DALIAN MARITIME UNIVERSITY
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