R Series

High Torque / Small Envelope

The R series design provides maximum torque within a small envelope. In the R Series design, the piston and actuating cylinder, which is integral with the mounting hub, rotate. Bearings are not required. The shaft on which the hub mounts is rifled and cross drilled to provide passage for the actuating media. A press fit or cap seals are necessary to prevent media pressure loss due to seepage past the hub and shaft interface.

Although the R series design can withstand high rotational speeds, consideration must be given to disengaging and freewheeling speeds when the units are hydraulically actuated. Review the maximum disengaging speed for each standard model.

Operation: Pressurizing the cylinder with fluid or air forces the piston to clamp and lock the friction and separator discs, and release springs. Torque is transferred through the clutch to the drive cup. When
pressure is removed, the release springs separate the separator discs and maintain a running clearance between separator and friction disc surfaces.

Mounting: The shaft on which the clutch hub mounts is rifled and cross-drilled to provide passage for the actuating media. A press fit or cap seals are necessary to prevent media pressure loss due to seepage past the hub and shaft interface.

Lubrication: R Series clutches and brakes
are designed for wet or dry operation.

Features
• Maximum Torque / Minimum Envelope
• Does Not Require Bearings
• Short Axial Length
• Fast Response
• Minimal Drag, Positive Disengagement
• Light Weight
• Minimal Actuating Flow
• Hydraulic or Pneumatic Actuation
• Fast Engagement / Quick Release
• Modified Standards for Specific
Design Requirements

R Series Dimensions
Model	Units	E	G	F	J	N	R	S*	V	W
350	in mm	3.50 89	3.81 97	6	.734 18.7	3.88 98	1.328 33.7	1.000 25.4	0.22 5.5	0.188 4.8
450	in mm	4.50 114	4.88 124	6	.797 20.2	4.88 124	1.656 42.1	1.000 25.4	0.28 7	0.219 5.6
550	in mm	5.50 140	6.00 152	12	.609 15.5	5.94 152	1.859 47.2	2.000 50.8	0.31 8	0.188 4.8
600	in mm	6.00 152	6.56 167	12	.609 15.5	6.56 167	2.000 50.8	2.000 50.8	0.38 10	0.188 4.8
700	in mm	7.00 178	7.63 194	12	.734 18.7	7.69 195	2.172 55.2	2.000 50.8	0.38 10	0.281 7.1
800	in mm	8.00 203	8.63 219	12	.734 18.7	8.69 221	2.406 61.1	2.500 63.5	0.38 10	0.344 8.7
900	in mm	9.00 229	9.75 248	12	1.250 31.8	9.88 250	2.969 75.4	2.500 63.5	0.44 11	0.500 12.75

Model	Units	A 1	D	H	K	L	U2	X	Y
350	in mm	1.250 32	1.660 42.2	0.25 6	1.30 33	2.072 52.6	60°	0.063 1.6	0.067 1.7
450	in mm	1.781 45	1.970 50.0	0.25 6	1.63 41	2.475 62.9	60°	0.063 1.6	0.088 2.2
550	in mm	2.281 58	2.210 56.1	0.31 8	1.77 45	2.716 69.0	60°	0.063 1.6	0.094 2.4
600	in mm	2.656 67	2.435 61.9	0.38 10	1.94 49	3.00 76.3	60°	0.094 2.4	0.145 3.7
700	in mm	3.125 79	2.623 66.6	0.38 10	2.10 53	3.284 83.4	60° note 3	0.063 1.6	0.099 2.5
800	in mm	3.500 89	3.115 79.1	0.44 11	2.48 63	3.839 96.5	60° note 3	0.063 1.6	0.101 2.6
900	in mm	4.125 104	3.382 85.9	0.44 11	2.61 66	4.325 109.9	60° note 3	0.078 2.0	134 3.4

R Series Torque and Speed Capacities @ 150 PSI (10.3) BAR
Model	Unit	Torque	Max. RPM	Disengaging
350	Ft. lbs	188	6700	2700
	Nm	255
450	Ft. lbs	329	4600	2500
	Nm	500
550	Ft. lbs	601	3800	1800
	Nm	815
600	Ft. lbs	874	3500	1500
	Nm	1185
700	Ft. lbs	1230	3000	1400
	Nm	1668
800	Ft. lbs	1711	2600	1300
	Nm	2320
900	Ft lbs	2311	2300	1200
	Nm	3134

*See the chart on page 7 for incremental torque ratings. Modified standards available for specific design
units are inches; lower value units are millimeters.

Notes:
Unless otherwise noted, upper value units are inches; lower value units are millimeters.

Customer to specify dimensions A, B and C. Hub bore dimension A not to exceed maximum allowable bore.

1. Maximum allowable hub bore with rectangular key.
2. Maximum allowable hub bore with square key.
3. American National Pipe Thread.
4. Consult Logan Clutch Corporation if your application requires greater torque capacity or higher speeds.