Roller Ramp Clutch Design Technology

Roller Ramp Clutch

Indexing
Design efficiency is enhanced when the outer ring is the driving component, oscillating back and forth. At intermittent rotation of the inner ring, motion can be made almost continuous by mounting clutches side by side with overlapping actuation. Increased spring force can be supplied for very high indexing requirements. The use of light weight oils and the addition of a second clutch for backstopping will improve efficiency. The above mentioned necessity of some elastic deformation, resulting in a certain angle of twist, has to be taken into consideration to find the best ratio of nominal torque to applied torque.

Overrunning
Overrunning clutches achieve maximum performance when the inner ring is the slowest or stationary part.

Backstopping
Backstops operate best when the outer ring is held stationary allowing the inner ring to rotate freely in one direction. The use of low viscosity lubricants is important. For very high speeds where RPM exceeds catalog ratings we often suggest circulating oil systems. Consult GMN when in doubt.

Transmittable Torque, VS / VSNU / VF/ VGF / VGL / VGLP
The nominal torque M, shown in the data sheets, refers to 107 cycles. It is calculated with a service factor of S = 2.5. Torque peaks in use may never be higher than M x 2.5 [Nm].

Transmittable Torque, Series VGV
The nominal torque M, shown in the data sheets, refers to 105 cycles. It does not include any service factors. Torque peaks in use may never be higher than nominal torque.

Transmittable Torque, Series VEK
In general the nominal torque M, shown in the data sheets, refers to 107 cycles and it is also calculated with a service factor of S = 2.5. Please note also that at series VEK torque peaks referring to the inertia of all accelerated parts have to be expected.

For proper disengagement a minimum of driven mass will be required depending on the speed. Within the limits, shown in the data sheets (nmax; nmin;), the inertia of the VEK clutch itself will be sufficient for proper disengagement (nmin) and reasonable lifetime (nmax).

Bolts - Torque indicating wrench

Bolts Class 8 Class 9 Series Series
Type Tightening Torque [Nm] VGL, VGLP VEK
M4 3,5 4   10
M5 7 8,5 12,15 15,20
M6 12,5 14,5 20,25,30,35 30
M8 30 35 40,45,50 40
M10 60 70 55,60,70,80 50
M12 105 120    

Thread length in outer ring: L = 1.5 x Bolt Type


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