Pressure Distribution in Journal Bearings Apparatus | FrixoDynamics FX-529
Product Overview
A CE-certified precision laboratory apparatus for engineering experimentation and technical education, manufactured by Scientico India to ISO 9001:2015 standards. Supplied with calibration certificate, operation manual, and complete export documentation. Designed for Forces and Friction laboratories in engineering colleges and technical institutions.
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Technical Specifications
| Parameter | Specification |
|---|---|
| Model | FrixoDynamics FX-529 |
| Shaft Diameter | 50 mm |
| Shaft Length | 50 mm |
| Shaft Material | Stainless steel |
| Bearing Shell Internal Diameter | 52.5 mm |
| Bearing Gap Range | 0 – 2.5 mm |
| Bearing Shell | Transparent, open (partial enclosure) |
| Bearing Shell Mounting | Two spring plates, moveable |
| Pressure Measurement Points | 13 radial points around bearing circumference |
| Pressure Display | 13 tube manometers (oil column height) |
| Pressure Measurement Range | 360 mm oil column |
| Bearing Housing Adjustment | Micrometer screw, 0 – 25 mm range, 0.01 mm graduation |
| Motor Power | 200 W geared motor |
| Speed Range | 0 – 200 rpm (continuously adjustable) |
| Speed Display | Digital display on control panel |
| Lubricant | Oil, ISO VG class (0.5 L supplied) |
| Scope of Delivery | 1 experimental unit, 1 x 0.5 L oil, 1 set of instructional material |
Key Features
Key Features
- 13 radial pressure measurement points around the bearing shell circumference, each connected to an individual tube manometer, the full circumferential pressure profile is visible simultaneously without sensor repositioning
- Transparent bearing shell allows direct visual observation of the lubricating film and hydrodynamic gap during operation
- Micrometer screw bearing gap adjustment (0–25 mm range, 0.01 mm graduation) enables precise, repeatable gap width setting for systematic pressure distribution and stability experiments
- Spring plate bearing shell mounting replicates the self-aligning behaviour of a real bearing housing under hydrodynamic and load forces
- Continuously variable shaft speed 0–200 rpm with digital display for systematic speed-dependent pressure profile investigation
- Pressure measurement range of 360 mm oil column provides adequate resolution for the full operating speed and gap range of the apparatus
- 200 W geared motor delivers stable, consistent shaft speed for steady-state pressure distribution measurements
- Compact, self-contained unit with rapid assembly onto the drive unit frame
Applications
- Visualisation and measurement of the circumferential pressure distribution in a hydrodynamically lubricated journal bearing
- Investigation of the effect of shaft speed on the radial pressure profile in the bearing gap
- Investigation of the effect of bearing gap width on pressure distribution magnitude and profile shape
- Study of the bearing stability limit as a function of gap width
- Demonstration of the hydrodynamic pressure support mechanism, how the lubricant film carries the shaft load without metal contact
- Comparison of pressure distributions at different load and speed combinations
- Undergraduate and postgraduate laboratory practicals in tribology, machine elements, lubrication engineering, and mechanical engineering design
- Supplementary demonstration for courses covering hydrodynamic bearing theory, Reynolds equation, and bearing design
Construction and System Design
The FX-529 is designed for rapid assembly onto a drive unit frame, with all major components, motor, shaft, bearing shell assembly, manometer bank, and control panel, arranged in a compact, accessible layout. The 200 W geared motor is coupled to the 50 mm stainless steel shaft through the frame, driving the shaft at speeds set and displayed via the control panel. The shaft runs within the open bearing shell, which partially encloses it to simulate the journal bearing geometry.
The bearing shell is secured in a radially movable housing supported by two spring plates. The spring plate mounting allows the shell to deflect slightly under hydrodynamic and load forces, as a real bearing housing would. The micrometer screw on the housing provides fine, graduated radial positioning of the shell relative to the shaft axis, setting the bearing gap with 0.01 mm resolution. The gap is confirmed by direct micrometer reading, not inferred from motor parameters, ensuring precise gap setting for each experiment condition.
Thirteen pressure tapping ports are distributed around the bearing shell circumference at defined angular intervals. Each port is connected via a small-bore tube to one of the 13 tube manometers mounted on a vertical panel beside the apparatus. As hydrodynamic pressure builds in the bearing gap, oil is forced into the manometer tubes, and the column heights provide a direct, visual, and quantitative representation of the local pressure at each angular position. The pressure profile across all 13 points is readable simultaneously, allowing the full circumferential pressure distribution to be recorded at any operating condition without repositioning any sensor.
The transparent bearing shell allows the lubricant meniscus and film condition to be observed directly during operation. Lubricating oil is supplied to the bearing via the included 0.5 L quantity, with the system designed for recirculation or replenishment as required during the experiment programme.
Export and Supply Capability
The SCIENTICO FrixoDynamics FX-529 is available for supply to engineering colleges, technical universities, mechanical engineering departments, research institutions, and industrial training centres. SCIENTICO manufactures and exports laboratory equipment to institutions and distributors across multiple regions. Standard packaging is suitable for international shipment. Bulk orders, customised configurations, and institutional procurement enquiries are welcomed. Please contact SCIENTICO directly for pricing, lead times, and shipping terms.
Standards & Compliance
- Manufactured under ISO 9001:2015 Quality Management System
- CE Marking - European Conformity where applicable
- Supplied with calibration certificate, operation manual, and experiment guide
- 12-month manufacturer's warranty (parts & labour from installation)
Ordering & Delivery
- Incoterms: CIF to destination seaport, FOB Mundra/Nhava Sheva, or Ex-Works Ambala
- Lead time: 3–5 weeks production + sea transit to destination
- Payment: LC (Letter of Credit) or T/T bank transfer against proforma invoice
- Documentation: commercial invoice, packing list, bill of lading, certificate of origin, insurance certificate
Frequently Asked Questions
Q1: What does the pressure distribution in journal bearings apparatus demonstrate?
The FX-529 demonstrates how a rotating shaft journal generates a non-uniform pressure distribution within the lubricating film of a hydrodynamic journal bearing. The pressure rises on the loaded side of the shaft as the lubricant is drawn into the converging gap between the shaft and bearing shell, and it falls on the unloaded side. The 13 tube manometers display this pressure profile simultaneously around the full circumference, making the hydrodynamic support mechanism directly visible and quantifiable.
Q2: How does shaft speed affect the pressure distribution in the FX-529?
As shaft speed increases, the hydrodynamic effect strengthens, the rotating shaft pumps more lubricant into the converging gap, generating higher pressures. Students observe that the peak oil column height in the manometers increases with speed, and that the asymmetry of the pressure profile, with higher pressure on the loaded side and lower on the other, becomes more pronounced. This directly demonstrates the speed dependency of hydrodynamic bearing load capacity.
Q3: What is the bearing stability limit, and how is it investigated on the FX-529?
The bearing stability limit is the minimum bearing gap width at which stable hydrodynamic operation can be maintained. As the gap is reduced below a critical value, the pressure distribution can become asymmetric to a degree that causes the shaft to be pushed further toward the shell wall rather than self-centering, a condition of instability that can lead to contact. The FX-529 allows the gap to be reduced in controlled steps using the micrometer screw, and students can observe the changes in pressure profile and shaft behaviour as the stability limit is approached.
Q4: Why are tube manometers used instead of electronic pressure sensors on the FX-529?
Tube manometers provide a simultaneous, visual, real-time display of all 13 pressure values without any electronic instrumentation, calibration, or signal processing. The oil column heights are directly proportional to the local gauge pressure at each tapping point and can be read and recorded immediately. This makes the full circumferential pressure profile visible at a glance, a significant pedagogical advantage for demonstrating the pressure distribution concept compared to reading 13 separate digital values. The 360 mm oil column measurement range is appropriate for the pressure levels generated in this apparatus at operating speeds up to 200 rpm.
Q5: What is included in the scope of delivery for the FX-529?
The FX-529 is supplied as a complete unit including: one pressure distribution experimental unit with 50 mm stainless steel shaft, transparent open bearing shell on spring plate mounting, micrometer-adjustable bearing housing, 13-point circumferential pressure tapping system, 13 tube manometers, 200 W geared motor with continuously variable speed control, and digital speed display; one 0.5 L quantity of lubricating oil; and one set of comprehensive instructional material covering assembly, experimental procedures, theory, and data recording guidance.