Engine mounts

On the other hand, CR is a versatile material that is able to take advantage of new opportunities. Right now, these are in dynamic appHcations such as air bags, air springs, and heat-resistant engine mounts. 

A pressurized lubrication system using an engine-mounted pump is the choice of most manufacturers. A sump in the crankcase or an external drain tank together with filters and coolers complete the system. The choice of oil should be consistent with the manufacturer s recommendation, and should only be varied if the engine is to be operated in unusual or extreme conditions. 

These have been developed for special uses. For example, since petroleum-based materials harm natural rubber, a grease based on castor oil and lead stearate is available for use on the steel parts of rubber bushes, engine mountings, hydraulic equipment components, etc. (but not on copper or cadmium alloys). Some soft-film solvent-deposited materials have water-displacing properties and are designed for use on surfaces which cannot be dried properly, e.g. water-spaces of internal combustion engines and the cylinders or valve chests of steam engines. 

Conveyor belt cover Engine mount Tank pad Oil seal... 

The essential performance properties for an engine mount are low heat buildup and low dynamic compression set. These have been determined for a typical engine mount compound based on NR, with and without Perkalink 900—Table 14.50. 

Compared to the previous example, the engine mount formulation contains a cure package tending to an SEV system this will provide a greater degree of reversion resistance compared to a CV cure system. Nonetheless, the antireversion agent is still able to provide significant, additional benefit. 

FE simulations of the stress-strain properties of fiUer-reinforced elastomers are an important tool for predicting the service live performance of mbber goods. Typical examples are the evaluation of rolling resistance of tires due to hysteresis energy losses, mainly in the tire tread or the adjustment of engine mounts in automotive applications. 

Reuvekamp, L.A.E.M., Reactive Mixing of Silica and Rubber for Tyres and Engine Mounts, Twente University Press, Enschede, The Netherlands, 2003. 

Little comment can be made on the uses of this material except that it is used in some mouldings where the advantages of heat resistance, low temperature performance and oil resistance, roughly equivalent to that of polychloroprene, can be utilised. It has been investigated for use in engine mounts and transmission belting. 

Engine-Mounted Mechanical Fan Shroud on 2004 DaimlerChrysler RAM HD Pick-Up is manufactured from a TPE (NexPrene 1087A) overmoulded on a plastic ring, leading to a lower cost. 

PIB and various copolymers are called butyl rubber. Butyl rubbers have lower permeability and higher damping than other elastomers making them ideal materials for tire inner liners and engine mounts. 

Figure 2-L Choices for compression testing an engine mount...

To be able to estimate bond strength by a non-destructive method is extremely attractive, especially for quality control purposes. The possibility of using ultrasonics for this application has been recognised for a long time36 and efforts have been made to standardise a procedure for the inspection of such components as engine mountings. 

Rubber industries produce various types of complicated products like tyre, cable, belt, seal, bearings, engine mounts, etc. The products are composed of rubber, plastics, fibre, metal, fillers and many other additives like antioxidants, accelerators, etc. Reverse engineering is a technique by which a rubber technologist can reconstruct the composition of the products based on thermal analysis. Dormagen [178] and Baranwal [179] reconstructed the formulation of a tyre, based on analyses of FTIR, spectra, thermal analysis and high performance liquid chromatography. 

The largest use of natural rubber is in the manufacture of tires. Over 70 percent of its consumption is in this area. The next largest use is as latex in dipped goods, adhesives, rubber thread, and foam. These uses account for approximately another 10 percent. The remainder is used in a variety of applications such as conveyor belts, hoses, gaskets, footwear, and antivibration devices such as engine mounts. 

The photo shows an X-15 rocket-powered aircraft used to test the effects of high-speed, high-altitude flight on humans and materials. The rocket engines, mounted under the wing of a B52 bomber, are powered by the reaction of H2 and O2. Data from 199 runs made by such aircraft were used in the development of the space shuttle. 

Engine tests are performed with an engine mounted on a computer-controlled brake, with an exhaust gas cooler or heater installed in between the engine outlet and the catalytic converter inlet. Several catalytic activity tests can be performed using this setup. 

As time and cost constraints make it impossible to use a fleet test as the test procedure in the development of emission control catalysts, several simplified durability tests have been developed. In order of decreasing complexity, these tests are a vehicle driven on the road according to a well defined driving schedule, a vehicle mounted on a vehicle dynamometer driven according to a well defined procedure by robots, tests with an engine mounted on an engine dynamometer, and tests in a laboratory furnace (Table 19). 

Thus, as an elastomer is compressed in, say, the Z-direction (as in an isolator on a rubber grommet, engine mount, or transmission mount), the mount will deform in the X and Y directions. This value is nearly 0.5 for natural rubbers (typically used for mounts in automotive systems). For steel, Poisson ratios are around 0.3. The Poisson ratio has no units. 

Ethylene-propylene diene monomer (EPDM) rubbers are used in mass predominantly in isolation systems such as CRFM (condenser, radiator, fan module) or engine mounting. More varied are the sealing applications, which include transmission seals and o-rings, HVAC module seals and gaskets, radiator seals, weather stripping... 

---