Parker Hannifin Corporation

Daedal Division
1140 Sandy Hill Road
Irwin, PA 15642
Phone (800)  245-6903
Phone (724) 861-8200
Fax  (724) 861-3330

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Electromechanical Positioning Systems

Linear modules Technologies

Application Considerations
The HLE drive can be mounted vertically, horizontally with carriage up or carriage down, or with the carriage on its side. Customized carriage lengths, extended stroke lengths, and double units for increased load capabilities are available per customer requirements. A standard feature of the HLE Series is the stainless steel strip seal to prevent ingress of foreign materials.
 
Application Parameters
In general, the main application parameters to be considered when sizing an HLE system are:
The load weight to be transported
Maximum system speed, based on cycle time requirements
Maximum acceleration rate
Mounting orientation of the unit-horizontal or vertical
The mounting arrangement of the load to the carriage. When the load to be transported is not directly or uniformly mounted to the carriage, the resulting moment forces which are applied to the carriage must be evaluated.
Applications requiring long stroke lengths and high accelerations, which may cause concern with extrusion deflection characteristics or belt dynamics, must be evaluated on an individual application basis. Please consult with Parker    Engineering, your local Automation Technology Center.

General Information

The HLE product family is comprised of four basic sizes relating to their cross- sectional area. These are the HLE60, HLE80, HLE100c and HLE150c. The cross- sectional area of these units is 57 x 57 mm (2.3 x 2.3 in), 80 x 80 mm (3.15 x 3.15 in), 1 00 x 1 00 mm (3.93 x 3.93 in), and 150 x 150 mm (5.90 x 5.90 in), respectively. As the unit cross-sectional area and bearing size increase, the load carrying capability also increases.  The larger cross-sectional area also allows for profiles which can be extruded to longer travel lengths.  All of the HLE products are available in the roller bearing design with the composite wheel tread. The HLE60 is also available in a linear bearing version designated the HLE60SR. The following table provides a summary of the HLE product family:
 

Figure 1

To select the proper HLE size, first consider the load to be transported. As depicted in Figure 1.

The maximum load that can be supported by the carriage when mounted in a horizontal orientation is F_z.
The maximum side load is designated by F_y. The maximum belt traction force available to accelerate the load when mounted horizontally, and to hold and accelerate the load when the unit is mounted in a vertical orientation is F_x.
 

Table 1 provides a summary of the maximum values of these forces for HLE units with a standard carriage.  For units with the extended carriage option, all values can be doubled (not valid for HLE60SR), except for the belt traction force.

The forces that a HLE unit can withstand decrease from the maximum values as the carriage velocity increases. Since the allowable forces are speed dependent, the load curves for the HLE model under evaluation must be reviewed in the application analysis. For speeds under 1 m/sec (40 in/sec), the values in Table 1 provide a good starting point.
 

Application Example
 
Mounting orientation: Horizontal, carriage up
Life required: 25,000 km (15,000 miles)
Speed: 500 mm/sec (20 in/sec)
Acceleration time: 0.5 sec
Direct load, Fz: 1,775 N (400 lbs) directly applied to carriage
 
Step 1
 
For units mounted horizontally, select a unit that provides a F2 value greater than the load weight to be transported. A 1,775 N (400 lbs) load force exceeds the maximum F2 value for an HLE60 or HLE80 with a standard carriage speed of 500 mm/sec (20 in/sec). If considering units with a standard carriage only, the choice would be an HLE150. Alternatively, and HLE100 with an extended carriage could be used.
 
Step 2
  
Use the acceleration rate to determine the belt force required for the application. The calculated belt force must be less than the maximum traction force, F x, of the unit selected. The acceleration rate required for this application would be:
 
a = velocity/time = 0.5 meters per sec/0.5 sec = 1 meter/sec²

The belt force required is less then calculated with the following formula:

F_x = ma = 1,775 N/9.81 meters per sec² x 1 meter/sec² = 180 N
 
 
180 N (41 lb) is well below the maximum avaiable traction force of the HLE system. Based on the application data, an HLE100 with an extended carriage or and HLE150 with a standard carriage could be selected.
For units mounted in a vertical orientation, not only must the belt hold the load, it must also accelrate the load against the force of gravity.
For a vertically mounted unit, the belt force required, based on the same application data woud be:
  
F_x = m(a + g ) = 1,775 N/9.81 m/sec² x (1 meter/sec² + 9.81 meter/sec²) = 1,995 N
 
 With a traction force of 1,995 N (449 lb), an HLE150 could be used or a HZR unit, which is specifically designed for vertical applications.
 
⁽¹⁾ For extended carriage designs (VL order code), all force and moment values (excluding F, belt traction force), can be doubled as long as the load is applied equally and uniformly over the full length of the carriage.
 
Double Axis Units
When selecting a double unit, the drive shaft critical speed must be evaluated.  Based on the length of the connecting shaft and the required shaft speed, the drive shaft may be required to be supported in one or more places. The standard connecting shafts are made of solid steel'. The diameters of the drive shafts, by unit are: HLE60-30 mm; HLE80c and HLEl00c-20 mm; and HLE150c-30 mm. Optional pillow block bearings are available from Parker to support the connecting shaft appropriately.  Please consult the connecting shaft critical speed chart for the maximum allowable unsupported length'. Hollow shaft systems and double axis units with center-driven reducers are also available to reduce shaft length and shaft wind up.  Please consult with Parker engineering.

Idler Units
Idler units are commonly used with single-axis units to make a double unit without a drive shaft.  In general, when using an idler it is recommended that the center-to-center distance between the driven
rail and the idler rail be less than or equal to the carriage length of the units selected.

Deflection
The HLE deflection formulas, and the deflection curves (see below) can be used for determining the deflection based on the profile length and the application load weight.  Applications requiring high acceleration forces can place a severe strain on the system stability. In these cases, a solid substructure may be required with the HLE product being supported at frequent intervals.

Note:

• For the HLE80c, HLE100c and HLE150c. The HLE60 uses a hollow drive shaft.
• For the HLE60, we recommend keeping the unsupported shaft length to less than 1.5 meters (60 inches).
   

HLE Deflection Formulas
Formulas listed here take into consideration the self deflection due to the weight of the aluminum profiles along with the weight to be transported.
 

The deflection curves illustrate the deflection F., based on the HLE profile being simply supported at both ends. The graphs take into consideration the self deflection due to the weight of the profile, along with the load to be transported.
The maximum deflection cannot be exceeded. If the maximum deflection is exceeded based on your application parameters, then additional supports are required. Alternatively, the next larger profile size may be considered.
 

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