Introduction
There is a market need for a device that allows constrained relative motion between two or more parts in a rotational or linear sense without causing excessive wear. The bearing is intended to fulfill this need by providing a smooth surface and mechanism that allows a shaft or component to move independently without causing damage in the form of wear to its support. Bearings themselves can be classified in terms of the motions that they allow, the particular principle of operation that they implement and the direction of applied loads that they are capable of handling. The specific design of bearing that will be evaluated in this report is the plain bearing [1].
Plain bearings tend to be the most inexpensive type of bearing available. Key features of this type of bearing include that they are light weight, compact and have high load-carrying capacity when compared to other varieties [7].
From this a brief initial product design specification can be made:
The bearing must be:
- light weight
- compact
- easily manufactured
- able to have a high load carrying capacity
- easily machined to be smooth
Plain Bearing Design
The factor that influences the specific design of a plain bearing is the type of motion that the bearing must accommodate. The three types of motion that are applicable for use with the plain bearing are journal or friction bearing, thrust and linear. The journal bearing, which is effectively a radial or rotary bearing, is the most common application; this is where a shaft rotates inside the bearing. As the journal bearing is the most common application, it is the particular principle of operation that will be covered by this report [7].
Plain bearings acting as independen...
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... Journal Bearing Systems (Mechanical Engineering Series). Springer.
5. ISO TC 123/SC 1, 1997. ISO 4378-1:1997, Plain bearings – Terms, definitions and classification – Part 1: Design, bearing materials and their properties. ANSI.
6. ISO TC 123, 1981. ISO 4385:1981, Plain bearings – Compression testing of metallic bearing materials. ANSI.
7. Surhone, M., Timpledon, M., Marseken, S., 2010. Plain Bearing: Bearing (Mechanical), Bearing Surface, Thrust Bearing, Linear Bearing, Journal Bearing, SAE International. Betascript Publishing.
8. Shahinpoor, M., Schneider, H., 2007. Intelligent Materials. Royal Society of Chemistry Publishing.
9. Knonsari, M., Booser, E., 2001. Applied Tribology: Bearing Design and Lubrication. John Wiley & Sons.
10. Totten, G., 2006. The Handbook of Lubrication and Tribology: Theory and Practice. 2nd Edition. CRC Publications.
Braham, Jones. “Keep Your Eye on the Bat.” Machine Design 63.13(1997). 29 Mar. 2002 http://newfirstsearch.oclc.org
Cappa, John, Sean Holman, and Ken Brubaker. "Automobiles- Springs and Suspension." Fourwheeler. NC WiseOwl, May 2012. Web. 17 Feb. 2014. .
A connecting rod subjected to an axial load F may buckle with x-axis as neutral axis in the plane of motion of the connecting rod, {or} y-axis is a neutral axis. The connecting rod is considered like both ends hinged for buckling about x axis and both ends fixed for buckling about y-axis. A connecting rod should be equally strong in buckling about either axis [8].
Webb, Scott, and Andy Kraushaar. John Deere Tractors. St. Paul, MN: MBI Pub., 2007. Print.
For this scope of this assignment a study in the surface modification of a titanium alloy stem, used in a hip joint implant is going to be studied. A total hip joint implant consists of an articulating bearing basically the femoral head and cup and the stem. The stem is made from titanium alloy - Ti- 6Al- 4V where titanium is alloyed with aluminium and vanadium. When titanium is alloyed with these materials excellent properties are achieved such as high strength-to-weight ratio and exceptional corrosion resistance.2 However, this alloy gives poor tribological properties and tends to seize when it is subjected to sliding motion due to its low hardness of 36HRC.3 Several surface modification techniques are done on ti...
Roller screws are accustomed remodel rotary movement into linear movement and the other way around. The bearing components are threaded rollers positioned between the screw and therefore the nut. The massive variety of contact points permits roller screws to support terribly high loads. The roller screw is comparable to the ball screw with the distinction that the load transfer components are threaded rollers. When put next to standard ball screws, have the subsequent advantages: the most advantage of roller screws is that they need an outsized variety of contact points to support the load with higher permissible static and dynamic load capability. Due to the larger variety of contact points the bearing perform is ensured by uniform spreading of load over the threaded rollers rather than balls just in case of ball screws. It's higher mechanics and dynamics in operating condition, generates less vibration and lower noise. The transmission exactitude of PRS is higher and may add a lot of more durable condition. Because to these compensation, a lot of analysis on roller screw has been administrated, and therefore the roller screw has been utilized in the medical, aerospace, military, assembly, Food and drink, Plastics, textiles and machine tools industries.
The steering column is the shaft directly under the steering wheel in which the ignition and automatic shift levers are often located. When the steering column was first invented, it consisted of a single, long, steel rod connecting the steering wheel to the steering gear box. While this single-piece construction was efficient, and effective in controlling the vehicle, it soon became apparent that its design was unsafe in frontal collisions. Under the single-piece system, when such an impact occurred, the steering column would often impale the driver as it was rammed toward the rear of the vehicle. The unsafe attributes of single-piece steering columns called for the invention of a safer steering column design, which is why BelaBarenyi designed the collapsible steering column to replace it. The safely enhanced construction of the collapsible steering column, no matter which design is used, absorbs, rather than transfers, frontal impact energy by collapsing or breaking upon impact. In this way, drivers involved in frontal impact collisions are able to avoid the dangers of non-collapsible steering parts. Though the designs for steering columns have varied since their inception, a typical collapsible steering column looks like two interlocking shafts that attach directly to the steering wheel and the
Coating the bearings of high speed motors since allows for the even distribution of lubricating oil.
This paper will concentrate on the disk brake, but drum brakes are still very common in today’s cars and trucks. The fundamental difference between the two is how, and from what direction the force of the braking material contacts the braking surface. The disk brake uses a caliper that pinches the disk, which rides between the two brake pads on both sides. This lateral force squeezes the disk, and therefore stops it.
Journal bearings are some of the most important machine elements used in industrial applications. They are widely used in IC engines, steam and gas turbines, pumps, compressors, etc. When well designed and maintained, they have benefits of supporting high load carrying capacity with a wide range of speeds and unlimited life in comparison with the expense and limited life of ball and roller bearings. Cylindrical journal bearing normally consists of a journal supported by a simple sleeve and sufficient supply of lubricant. The circular hydrodynamic journal bearing becomes noncircular when it was subjected to the wear due to successive starts and stops for a long period of work. This local variation in geometry of the
The larger the circumference of the bearings, the faster it would roll down the v-ramp as the force is pushing behind the larger amount of surface as well as completing one full turn rather than smaller turns to make a whole.
This has the benefit of reducing friction and surface fatigue together with reduced heat generation, operating noise and vibrations. Lubricants achieve this by several ways. The most common is by forming a physical barrier i.e. a thin layer of lubricant separates the moving parts.
...aft for six feet stretched 2006 Hummer H2. I had to design the shaft for critical speed and its torsional strength by taking into consideration for minimal vibrations in operation at different engine speeds. I’m thankful to my Manager Mr. Ayaz Patel for believing in me and giving an opportunity to demonstrate my skills.
?Robotics will boost quality and transfer efficiency levels.? Coatings (Jul.-Aug. 1991): 66 InfoTrac. Online. Nov. 2002. .
In my undergraduate years, I have acquired a strong background in the fundamentals of basic mechanical engineering, having studied subjects such as Strength of Materials, Thermodynamics, Fluid Mechanics, Heat and Mass Transfer, Design of Machine Elements and Automobile Engineering. Whilst pursuing my diploma & degree courses, my interest for Automotive Engineering grew even more having learnt more on the different types of internal combustion engines, their configuration and importance. However, what I lacked was a practical understanding on these core areas of Automotive Engineering. To gain a better understandi...