PTO Clutch/Brakes for Outdoor Power Equipment Sealed bearings with high temp grease Solid forged rotor Component parts e-coated Heavy duty back plate High temperature Epoxy coil One piece design pre-adjusted at factory

Introduction Introduction The Ogura Clutch Company was founded in 1938. Since that time, it has grown to be the largest manufacturer of electromagnetic clutches in the world. Ogura has technical and manufacturing representation worldwide. Ogura’s numerous quality awards reflect a desire for continuous improvement which we apply not only to our products; but, also to our personnel. We believe the cornerstone of quality begins with people. This is why our personnel are continually trained on the latest manufacturing techniques and design principles. Our plants currently conform to ISO9001 and some...

Products In This Catalog Products In This Catalog There are tw o basic models of clutches described in this catalog. PTO Clutch/Brakes: These are used to engage and to also help stop cutting blades that are used on tractors and commercial cutting machines. They can be either flange or bearing mounted. They are typically used on gas and diesel engines which can be up to 31 horsepower. (Sometimes higher, depending upon how much horsepower can go through the clutch.) Information contained in this catalog is as accurate as possible; however, we cannot be held responsible for errors and omissions.

PTO clutch/brakes are primarily made up of three major sub-assemblies. They are: 1 . Field/rotor assembly: This is the coil, backing plate and rotor. The coil provides the magnetic flux that allows the clutch to pull in. The rotor provides the input rotation and is mounted on the input shaft. 2. Pulley/armature assembly: This includes the armature disk, springs, hub and pulley. This is the output of the clutch. In some instances, a mounting flange is used instead of a pulley. 3. Brake assembly: This includes the brake shroud, adjustment nuts and springs. By controlling the force against this...

PTO Clutch/Brake Components ROTOR ARMATURE PULLEY ARM. SPRING FIELD COIL BACKING PLATE BEARING BEARING BEARING COLLAR FIELD/ROTOR ASSEMBLY ARMATURE/ PULLEY ASSEMBLY BRAKE ASSEMBLY BRAKE COVER GAP ADJUSTMENT NUT Magnetic Flux Path COIL SPRING

Reasons For Using An Electromechanical PTO Clutch/Brake Compact unit: Both the clutch and the brake functions are contained in one single unit taking up a relatively small amount of space. Simple control set up: Since the clutches run directly off the battery, all that is required is a switch. This allows the clutch to be placed into tight locations since wires can be easily routed to a simple switch on the control panel versus linkages that would be required with mechanical units. Operator convenience: Rather than an operator trying to fight against a mechanical linkage or a belt idler, a simple...

Typical Applications for PTO Clutch/Brakes In almost all lawn and garden applications, the objective of the PTO clutch/brake is to start the cutting rotation of the blades and assist in stopping. Most applications require the addition of the brake to meet industry stop time recommendations; however, depending upon the size of the machine and the internal friction, some machines may only require a PTO clutch. We have provided PTO clutches and/or brakes for the following applications: CONSUMER RIDE-ON TRACTORS ZERO TURN RADIUS MACHINE COMMERCIAL WALK BEHIND MOWERS

Sealed Bearings with High Temp Grease Solid Forged Rotor Heavy Duty Back Plate Component Parts E-Coated High Temperature Epoxy Coil Reduced Burnishing Coating One Piece Design Pre-Adjusted at Factory

Typical Ogura PTO Clutch/Brake Design Advantages 1. Simple installation: Since the majority of Ogura clutches are one piece designs that come in pre-set, there are no adjustments to make either at the mower manufacturer or with the end user. Solid forged rotor: Different coil voltages available: High temperature longer life grease: High temperature epoxy coil: Reduced burnishing time: A one-piece solid forged rotor means no chance of internal parts separation. Our rotors also have an even wall thickness around the coil which gives optimum flux distribution, maximizing torque. Although 12 volt...

Ogura Part (ft-lbs) Clutch Type Field Type Voltage / Watt Pitch Diameter Nominal Over Ball Diameter Gauge Ball Diameter

Ogura PTO Field Types

FIELD TYPE A B Field Back Plate Mounting Options All PTO clutch / brakes need to have the field backing plate restrained. The restraining for the backing plate is equal to the brake torque in the unit. This could be anywhere from 3 to 10 lbs. depending upon the size of the PTO clutch / brake. There are a variety of methods acceptable. Some general acceptable methods are as follows: J Put a flat metal piece through the slots (F) of types A (1/4" X 5/8") or B (3/8" X 5/8"). Restrain one of the triangular pieces of the backing plate of type A or B inside a triangular cup coming from the frame....

Ogura Flange Mounted PTO Clutch/Brakes A flange mounted clutch does not have a field bearing. Although this makes installation more time consuming, there is also no possibility of bearing failure in this area. This means that flange mounted clutches are ideal for installations that would remain engaged for long periods of time. The drawing below shows a typical flange mounted PTO clutch/brake assembly. Although we have many designs of flange mounted PTO clutch/brakes (these were first used in the 1970's), there are very few that are still used in production today. These clutches are made so that...

Things to check before installation: Engine shaft size: Most of the time, PTO clutch/brakes are mounted directly on the engine shaft. If the installation is not on an engine shaft, please make sure that the tolerances are close enough to provide a snug fit between the bore of our clutch and the shaft. (All engine manufacturers should produce shafts within the required tolerances.) Also, a standard rule of thumb is that the minimum diameter of the shaft, for one piece designs, is also the minimum amount of shaft engagement. (Two-piece designs would require shaft engagement in both pieces.) The...