Measurement of Piston Pin-Bore Oil Film Pressure under Engine Operation
Abstract
:1. Introduction
2. EHL Simulation of Piston Pin-Bore Oil Film Pressure
- Nominal oil film thickness
- Local oil film thickness
- Mean hydrodynamic pressure
- Viscosity
- Sliding velocity
- Combined roughness
- Pressure flow factor
- Shear flow factor
- Contact pressure
- Standard devitations of combined roughness
- Peak radius at surface summit
- Surface density of asperity peaks on each surface
- Composite young’s modulus in contact area
- Contact load by shape factor
3. Experimental Equipment and Methodology
3.1. Engine Specifications and Experimental System
3.2. Structure of Thin-Film Pressure Sensors and Fabricated Positions
3.3. Pressure and Temperature Sensitivities
3.4. Lubrication Method between Piston and Pin
4. Experimental Results
4.1. Oil Film Pressure Results Measured with Thin-Film Pressure Sensors
4.2. Correlation between Actual Engine and Unit Fatigue Tester
5. Conclusions
- The oil film pressure at the piston pin-bore interface was measured during engine operation using thin-film pressure sensors fabricated on the sliding surface of the piston pin.
- The durability of the thin-film sensor was improved by using DLC as a protective film, and oil film pressure measurement was achieved up to 3000 rpm and full load.
- Simultaneous measurement of the oil film pressure at each part of the pin boss was performed using a multi-point type thin film sensor, and the pressure change at each measurement position was obtained. Also, the pressure generation state from the start of the engine to the idling of the engine could be measured over time. As a result, we were able to confirm the load sharing state and oil lubrication state of the piston pin boss at each measurement position.
- Immediately after engine startup, oil supply was not sufficient, and locally high pressures of 100 MPa or higher were detected. Especially at the 7 mm position corresponding to the edge of the pin bore, the pressure was over 120 MPa.
- In this study, tests were not conducted under high engine speed and load conditions owing to the nature of the test engine used, but it is planned to conduct tests and evaluations under such conditions in future work.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Item | Specification |
---|---|
Engine type | In-line 4-cylinder gasoline engine |
Bore × Stroke (mm) | 90 × 98 |
Displacement (cm3) | 2494 |
Compression ratio | 10.4 |
Engine Speed (rpm) | Load (Nm) | Oil Temp. (°C) | Water Temp. (°C) | Piston Pin Temp. (°C) |
---|---|---|---|---|
Engine start to 1000 rpm | No load | 32.0 | 40.4 | 50.5–52.1 |
2000 | Partial load | 86.1 | 57.3 | 111.4 |
3000 | Full load | 107.0 | 78.8 | 141.7 |
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Iwata, T.; Owashi, M.; Oikawa, M.; Mihara, Y.; Kobayashi, K.; Yamakawa, N. Measurement of Piston Pin-Bore Oil Film Pressure under Engine Operation. Lubricants 2022, 10, 258. https://doi.org/10.3390/lubricants10100258
Iwata T, Owashi M, Oikawa M, Mihara Y, Kobayashi K, Yamakawa N. Measurement of Piston Pin-Bore Oil Film Pressure under Engine Operation. Lubricants. 2022; 10(10):258. https://doi.org/10.3390/lubricants10100258
Chicago/Turabian StyleIwata, Takumi, Michiyasu Owashi, Masakuni Oikawa, Yuji Mihara, Kunihiko Kobayashi, and Naoki Yamakawa. 2022. "Measurement of Piston Pin-Bore Oil Film Pressure under Engine Operation" Lubricants 10, no. 10: 258. https://doi.org/10.3390/lubricants10100258