Constant Velocity Joint Boot

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constant velocity joint (CVJ) is an essential Part of the vehicle driven shaft system, supplying power to the wheeler. The wheels of an Automobile are rotated by the power of an engine transmitted through a rotating shaft, components of the shaft are coupled by a mechanism called Constant Velocity Joint which is required to transmit a constant rotation to the wheels.
The types of CV  by position are inboard and outboard, by function are fixed or plunging and by design are ball type and tripod.



 In front-wheel drive cars, ball-type CV joints are used on the outer side of the drive shafts (outer CV joints), while the tripod-type CV joints mostly used on the inner side (inner CV joints). 

Inner CV joints connect the drive shafts to the transmission, while the outer CV joints connect the drive shafts to the wheels.In the vehicle,CV joints connect the transmission to the half shafts, and again from the half shafts to the wheels.
These joints accommodate the up and down motion of the suspension and the back and forth turning of the wheels while maintaining a comfortable driving experience.  

The CVJ require lubrication and protection against contamination. 
A rubber CVJ boot provides the required function.The CV boot has to withstand the extreme conditions of temperature from -45 degree Celsius to 140 degree Celsius and also need to provide protection against stones, dirt, water and grease.
.These boots are held together by screws or bolts and do not require the disassembly or removal of the half shaft to install.The CVJ boot failure leads to the failure of the joint. On average the CV joint must run 150000 miles of Continuous flexing, Pelting and thermal Cycling.In the past the boots were made of CR rubber, however failure of the boot due to environmental damage initiated the change in the material. with change in material Dupont developed the Hytrel thermolastic Elastomer , which it has celeberated 25 years in the application of CV .

The Dupont Hytrel properties improved the design of the CV boots which helped in supporting the fuel efficieny of the vehicle.As the material combines the resilience, heat and chemical resistance with high strength and durability 
Ethylene acrylic elastomer, which offers high-heat resistance and excellent molding properties.                                      Key performance features of Vamac® include:
  • Low melt viscosity for molding complex shapes.
  • Excellent oil and grease resistance.
  • Heat resistance up to 170°C
  • Little or no distortion during rotation.

Another Vamac® product, DuPont™ Vamac® Ultra, is often selected for hot-side inboard CV joint boots for its combination of cost-effectiveness and its resistance to both grease and punctures.










































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Comments

  1. Simran9 September 2021 at 04:07

    Nice information about the injection molding and thanks for providing this blog post, more details.

    ReplyDelete

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