Single Universal Joints

Single universal joints can compensate an angular offset of up to 45° between the input and output shaft.
They typically operate at larger angles and higher torques than other types of couplings. They are also torsionally rigid and do not flex or wind up.

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Single joints are subject to non-uniform speeds at input and output shafts. This means that when the speed at the input shaft is constant, the speed at the output shaft fluctuates.

Double Universal Joints

Double Universal Joints can be created from two single joints by pinning or butting the hubs together, or specially designing the double joints with a single center section, to eliminate additional machining and assembling.

The advantage over a single joint is either an increased operating angle (W configuration) or the capacity to compensate parallel misalignment
(Z Configuration). They can also compensate the non-constant veloctiy between driving and driven shaft on a Single Universal Joint as long as they are oriented correctly.

Telescopic Joints

Telescopic drive shafts or double cardan joints are essentially a double joint with a section in the center that allows a flexible length of the center piece. The adjustable center element of a double cardan joint allows the shaft's length to be varied for easy installation or to compensate for axial play. This type of shaft can be used wherever a drive and its output shaft have not only parallel and angular misalignment, but axial displacement as well. Anywhere the position of the motor (drive) or the load (output) is frequently changed, an articulated shaft with a telescopic segment allows quicker, simpler repositioning than possible with a rigid two-joint shaft.
 

There are also applications that require a length change of the drive shaft in operation since one or both ends move. Depending on the application and environment, different profiles can be selected to design the center sliding feature. The simplest form is a square or hex shaft on one side with a mating hub on the other side. These connections are robust and cost-efficient.

For more precision and /or torque capacity, parallel-sided splines or shafts with multiple keys are a better option. Angled or involute spline profiles are available for extreme cases, but they come at a significantly higher cost.

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Wear on the shaft can be an issue when the sliding features move under load and during rotation &#; especially for stainless steels. Heat treatment or special coatings can be used to counter the negative effects.

In some cases, ball splines may offer a low friction and low wear option for long life.

Differences between Single-Acting and Double-Acting Hydraulic Cylinders

For industrial heavy lifting packed with power, hydraulic cylinders offer you the unidirectional force needed to power your industrial equipment. Ideal for dump trailers and platform truck trailers, telescopic hydraulic cylinders provide the long stroke lengths needed for a variety of mobile applications.

When deciding to purchase telescopic hydraulic cylinders, buyers are often tasked with choosing between single-acting and double-acting hydraulic cylinders. Learn what differentiates the two telescopic cylinder types to see which cylinder is best for your high-power hydraulic needs.

Single-Acting Hydraulic Cylinders

Offering a simple cylinder design with easy maintenance, single-acting hydraulic cylinders extend by relying on pressure from one side of the piston. The cylinders retract via gravity or weight of the load.

Advantages of Single-Acting Telescopic Cylinders

• Simplistic design with one line
  • Works best for one direction powered movement applications
• Compact/space-saving
• Cost-effective
• Perfect for mobile equipment

Double-Acting Hydraulic Cylinders

Double-acting cylinders provide more versatility than single-acting cylinders. Single-acting hydraulic cylinders have fluid pressure applied on one side of the piston, whereas double-acting cylinders have hydraulic fluid applied to both sides of the piston.

Advantages of Double-Acting Telescopic Cylinders

• Ideal for two-directional power options for mobile equipment
• Multi-directional power provides versatility
• More acceleration control than single-acting cylinders

Factors to Consider for Double-Acting Cylinders

• Less output force than single-acting cylinders
• More complex than single-acting cylinders

Single-Acting and Double-Acting Cylinder Comparison

Single-acting cylinders have power up and gravity down capabilities, whereas double-acting cylinders have power up and power down options.

• Two-directional power provides double-acting cylinders more control and versatility.
• Double-acting cylinders offer more precise stroke movements and increased flexibility.
• Single-acting cylinders provide robust, single direction heavy-duty lifting.

Get the Industrial Power You Need with a Single or Double-Acting Hydraulic Cylinder

Not sure where to begin? Our hydraulic cylinder experts can help you find the right single or double-acting hydraulic cylinder.

Know what you need? Check out our replacement telescopic hydraulic cylinders. We stock a wide selection of cylinders, well-suited for a variety of mobile equipment types and functions. We also manufacture custom telescopic cylinders built to spec.

Read more about hydraulic cylinder maintenance and how-to guides in our latest blog posts.

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