Drive Unit For Tribological Investigations

Drive Unit For Tribological Investigations The unit is perform the following experiments and investigations: Learning Objectives / Experiments: Supplied with experimental units; Rolling friction in friction wheels Elasto-hydrodynamic behaviour Dynamic friction in pin – disk Frictional vibrations Dynamic friction in cylindrical pin – roller Pressure distribution in journal bearings Specifications: Base module with drive unit and display and control unit for studying tribological phenomena Horizontal or vertical position of the drive shaft by means of pivotable motor block Various experimental units available as accessories Drive unit and experimental units secured by quick-action chucks Drive unit comprising dc motor with worm gear Speed of the dc motor is continuously adjustable Speed measured by incremental encoder frictional force measured by force sensor force and speed displayed on display and control unit Technical Data: DC motor Rated speed: 3000rpm Torque: 18,5nm Worm gear: ratio 15:1 Operating speed: 0...200rpm, electronically controlled Measuring ranges Force: 0...50n Speed: 0...200rpm 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase UL/CSA optional Dimensions and Weight Length x Width x Height: 500x450x280mm (base module) Weight: 10kg Length x Width x Height: 360x330x170mm (display and control unit) Weight: 6kg 1. Rolling friction in Friction Wheels Determine the frictional forces as a function of load, lubrication and operating speed How slip affects the frictional force Determine the coefficients of friction Specifications: Frictional forces in two rolling friction wheels Quick and easy assembly of the experimental unit on the frame of the drive unit Driving wheel is driven by a clampable coupling between drive unit and gear unit Slip between friction wheels kept constant at 4% by means of gear unit Load on the friction wheels via lever arm and stepped weights Friction wheels materials pair: aluminium/rubber Use of different lubricants Frictional force measured by force sensor Displays of force and speed and speed adjustment on the drive unit Technical Data: Load application device Load: 80N Lever arm ratio: 2:1 Friction wheels Ø=49mm Ø=45mm, incl. rubber ring Gear ratio i: 0,96, slip 23% Force sensor for frictional force 0...50N Weights 1x 5N (hanger) 1x 5N 1x 10N 1x 20N Dimensions and Weight Length x Width x Height: 480x250x150mm Weight: 7kg 2. Elasto-hydrodynamic behaviour Learning Objectives / Experiments: Together with the drive unit Determine the thickness of the lubricating film at the contact point of a sphere with a plane surface - compare with theoretical value Study the effect of load and speed on the thickness of the lubricating film Specifications: Elasto-hydrodynamic behaviour of a lubricating film layer between sphere and rotating glass plate Quick and easy assembly of the experimental unit on the frame of the drive unit Determine the thickness of the lubricating film by optical interference Glass plate is driven by a clampable coupling between drive unit and gear unit Hardened steel sphere, polished Rotating plane-parallel glass plate with dielectric coating Continuous load on the sphere via lever arm Load measured by force sensor Displays of force and speed and speed adjustment on the drive unit Technical Data: Load application device Load: 150N Lever arm ratio: 3:1 Sphere Diameter: 25,4mm Hardened steel, polished Glass plate Diameter: 150mm, plane-parallel Coating: bk 7, dielectric, r=30% Microscope Magnification: x50 Halogen lamp: 10w Force sensor: 0...50N Dimensions and Weight Length x Width x Height: 350x250x550mm Weight: 8kg 3. Dynamic friction in pin - disk Frictional forces in different friction pairs and loads Frictional forces with different lubrication Frictional forces at different relative speeds of the friction partners Wear under different friction parameters and lubrication conditions Specifications: [1] frictional forces in pin and disk, which slide against each other, disk subjected to axial load [2] quick and easy assembly of the experimental unit on the frame of the drive unit [3] disk is driven by a clampable coupling between drive unit and gear unit [4] fixed pin made of different materials: aluminium, brass or steel [5] rotating disk made of hardened and ground stainless steel [6] load on the pin via lever arm and stepped weights [7] use of different lubricants, e.g. water or oil [8] frictional force measured by force sensor [9] displays of force and speed and speed adjustment on the drive unit Technical Data: Load application device - max. load: 80N - lever arm ratio: 2:1 Disk - Ø=50mm - hardened stainless steel, ground Pin, ØxH: 4x25mm - 3x aluminium - 6x brass 6x steel Force sensor for frictional force - 0...50N Weights - 1x 5N (hanger) - 1x 20N - 1x 10N - 1x 5N Dimensions and Weight Length x Width x Height: 350x430x230mm Weight: 8kg 4. Frictional vibrations Observation of the transition from static to dynamic friction Influence of lubrication on slip–stick phenomenon Influence of the force between the friction partners on the slip–stick phenomenon Influence of the relative velocity of the friction partners on the slip–stick phenomenon Specification: [1] friction oscillations at static and dynamic friction [2] quick and easy assembly of the experimental unit on the frame of the drive unit [3] rotating stainless steel disk [4] disk is driven by a clampable coupling between drive unit and gear unit [5] friction ring of different materials: stainless steel, brass or plastic (PA) [6] friction pair subject to load by stepped weights [7] frictional force measured by force sensor [8] displays of force and speed and speed adjustment on the drive unit Technical Data: Disk - Ø: 60mm - stainless steel Friction ring - outer diameter: 80mm - inner diameter: 50mm - 1x stainless steel - 1x brass - 1x plastic (PA) Force sensor for frictional force - 0...50N Weights - 1x 5N - 3x 10N Dimensions and Weight Weight: 7kg 5. Dynamic friction in cylindrical pin - roller Together with the drive unit Frictional forces in different friction pairs and loads Frictional forces with different lubrication Frictional forces at different relative speeds of the friction partners Wear under different friction parameters Specification [1] frictional forces in cylindrical pin and roller that slide on each other (point contact) [2] quick and easy assembly of the experimental unit on the frame of the drive unit [3] rotating roller made of hardened and ground stainless steel [4] roller is driven by a clampable coupling between drive unit and gear unit [5] fixed cylindrical pin made of different materials: aluminium, brass or steel [6] load on the cylindrical pin via lever arm and stepped weights [7] use of different lubricants, e.g. oil or water [8] frictional force measured by force sensor [9] displays of force and speed and speed adjustment on the drive unit Technical Data: Load application device - max. load: 80N - lever arm ratio: 2:1 Roller - Ø=40mm - hardened stainless steel, ground Cylindrical pin, ØxH: 10x20mm - 3x aluminium - 6x brass - 6x steel Force sensor for frictional force - 0...50N Weights - 1x 5N (hanger) - 1x 20N - 1x 10N - 1x 5N Dimensions and Weight Length x Width x Height: 570x100x120mm Weight: 8kg 6. Pressure distribution in journal bearings Learning Objectives / Experiments: Together with the drive unit Pressure distribution in the journal bearing depending on speed Pressure distribution in the journal bearing depending on load or bearing gap width Stability limit as a function of the gap width Specification [1] demonstration and visualisation of the pressure distribution in a journal bearing with hydrodynamic lubrication [2] quick and easy assembly of the experimental unit on the frame of the drive unit [3] roller is driven by a clampable coupling between drive unit and gear unit [4] bearing housing is completely transparent [5] moveable bearing housing, adjustable bearing gap [6] 13 radial pressure measuring points on the bearing shell [7] radial pressure distribution indicated with 13 tube manometers [8]base module required for operation Technical Data Shaft - diameter: 50mm - length: 50mm - material: stainless steel Bearing shell - diameter: 52,5mm - bearing gap adjustable from: 0...2,5mm Adjustment mechanism for bearing shell - graduation: 0,01mm Oil - ISO viscosity grade: VG 32 Measuring ranges - pressure: 360mm oil column - speed: 0...200rpm Dimensions and Weight Length x Width x Height: 350x150x450mm Weight: 4kg.

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