A.   External shrink-disk bushing. For this configuration Candy must extend the length of the hollow inner shaft to accommodate the bushing. The shrink-disk bushing is placed over the outer diameter of the hollow shaft and the HDC is then placed over the end of the machine shaft. By tightening the locking screws, the bushing clamps down on the hollow shaft and thus securing the connection. This method accommodates larger journal diameters than the compression type bushing.

B.  Internal compression type bushing. The bushing is inserted into the bore of the hollow inner shaft and then the HDC and bushing are placed over the end of the machine shaft. By tightening the locking screws, the bushing expands into the hollow shaft while at the same time clamps down on the machine shaft.

Candy also recommends the use of a suitable support bracket secured to the machine frame. This bracket serves several purposes, the most important of which is to secure the HDC axially to the machine. It may also be used to mount a control motor or locking knob assembly.

When installing the support bracket it is imperative that the HDC assembly is aligned correctly. Misalignment caused by improper installation may damage the differential. If the mounting methods described above are not suitable for your application, please consult the factory for alternative mounting suggestions.

1.  Remove the existing gear or pulley from the machine shaft journal, or for a new design, purchase the appropriate gear or pulley.

2.  Open the bore of the gear or pulley to fit over the pilot diameter (dimension C) on the outer housing of the HDC. After the bore is opened, add mounting holes to the gear or pulley in order to secure it to the HDC's outer housing.

3.  Mount the remachined gear or pulley to the HDC's outer housing using the tapped holes that are provided on each HDC unit (dimension S-BC).

4.  The differential and gear are now ready to be mounted on the end of the machine shaft. Please refer to the installation section above for preferred mounting methods.

After the HDC is mounted on the machine shaft it is important to secure the unit axially with a support bracket. Most brackets are simple "L" type arms which may be anchored to the machine side frame at any attitude. The HDC has a machined surface on the outboard end suitable for a bearing support assembly.

The support bracket also serves as a mounting device for a control motor or locking knob assembly. A control motor may be coupled directly to the HDC control shaft or the motor may be mounted to the bracket above or below the differential with a timing belt stepping across to the control shaft.

Candy Manufacturing can assist you with conversions or new machine designs.

Our services include:

• Running torque and inertia calculations
• Providing alternative mounting suggestions
• Machining and mounting gears or pulleys
• Supplying shaft bushings