A New Tribological Test Bench for Lightweight Hydraulic Components

Transcription

1 A New Tribological Test Bench for Lightweight Hydraulic Components IPROD-Meeting , Nis, Serbia IPEK M. Sc. Markus Blust 1 KIT University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association

2 Topics Introduction and Motivation Test Bench Model / Test Bench Design Measurement Results Conclusion and Outlook

3 Introduction and Motivation Reducing masses in motion becomes increasingly relevant. Lightweight design Hydraulic drive trains tend to be oversized High masses High costs Main component: Axial piston variable pump Cooperation with Bosch-Rexroth Figures: Bosch-Rexroth

4 Introduction and Motivation Approach: Replacing steel with polymeric material or hybrid design components Consequence: Changed tribology of the system Lack of knowledge regarding tribological behavior of polymeric or hybrid design components Objective: Gain insights into tribological effects in pump made of lightweight material components

5 Research approach: Test bench RPR Analysis of tribology between cylinder and control plate of the pump made of lightweight materials Modeling of tribological conditions Cylinder Tribological Contact Control Plate

6 Test Bench Model ØD F D Disk 1 Disk 2 T Fluid n Disk Similar to real pump: Disk s surface design Disk s surface roughness Source: youtube.de

7 Test Bench Model Characterisics Diameter of the test disks D Range mm 7 8 ØD 1 Pressure Load F D 0,5-6kN 6 F D 2 Maximum rotating speed n Disk /min Disk 1 Lubricant Temperature T Fluid C Friction force measurement system Indirect wear measurement Possibility for testing 8 tribological contacts at the same time T Fluid 5 Disk 2 4 n Disk 3 Friction Force (Wear)

8 Test Bench Model 7 8 ØD 1 6 F D Disk Disk Assumptions: Oil-bath lubrication Minimum temperature: 20 C T Fluid n Disk (only heating is possible, a cooling system is planed) Constant pressure load

9 Test Bench Design Main Components Electrical drive Test chamber Belt transmission Mounts for test components with friction force measurement system Table Mounts for test components

10 Test Bench Design Test Chamber Rotating test component (green) Nonrotating test component (blue)

11 Test Bench Design Test Chamber Input shaft Rotating test component shaft Gear drive

12 Test Bench Design Test Chamber Hydraulic cylinder Torque sensor

13 Test Bench Design Test Chamber Testfluid Oil-bath gear drive Sealing

14 Validation Test Procedure Common materials are used Fixed test component Validation Parameters Material rotating disk brass Material non-rotating disk modular cast iron Lubricant H-LP 32 (DIN 51524) Number of test 6 Validation test procedure Rotating test component

15 Conclusion and Outlook A test bench for the analysis of the tribological behavior of the contact between cylinder and control plate in the axial piston variable pump was developed. Main aim testing of the tribological behavior of lightweight materials Measurement results for validation reproducible test results according to literature There will be further tests with different lightweight materials in the future

16 Acknowledgements Thanks to the German Federal Ministry of Education and Research for the financial support within the framework of the research project LHYDIA Leichtbauhydraulik im Automobil

17 A New Tribological Test Bench for Lightweight Hydraulic Components IPROD-Meeting , Nis, Serbia IPEK M. Sc. Markus Blust 17 KIT University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association