One-way clutch
A one-way clutch is a power transmission component that transmits torque in one rotational direction only and freewheels in the opposite direction. It is also called a one-way clutch. The products listed are compact roller-type units in which the cylindrical rollers, located on wedge-shaped surfaces on the inner side of the outer ring, are pressed by springs. In the locking direction, the rollers wedge between the outer ring and the shaft to transmit torque; in the opposite direction, they disengage and freewheel. Springs are available in synthetic resin and metal types, and high-load and low-load types are offered. Grease is pre-packed, so no lubrication is required. Applications include paper feed in copiers, transport mechanisms in ATMs and ticket vending machines, and reverse-rotation prevention in fishing reels.
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One-way clutch
Small One-Way Clutch 1WC1216
Model: 1WC1216
High-load small one-way clutch with metal spring. For 12 mm shaft diameter, torque capacity 6.28 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch 1WC1012
Model: 1WC1012
High-load small one-way clutch with metal spring for 10 mm shaft diameter. Torque capacity is 2.35 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC1012C
Model: EWC1012C
High-load small one-way clutch with synthetic resin spring. For 10 mm shaft diameter, torque capacity is 2.35 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC1012A
Model: EWC1012A
Low-load small one-way clutch with synthetic resin spring. For 10 mm shaft diameter, torque capacity is 1.37 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC1010C
Model: EWC1010C
High-load small one-way clutch with synthetic resin spring. For 10 mm shaft diameter, torque capacity 1.96 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC1010A
Model: EWC1010A
Low-load small one-way clutch with synthetic resin spring. For 10 mm shaft diameter, torque capacity is 1.18 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0812C
Model: EWC0812C
High-load small one-way clutch with synthetic resin spring. For 8 mm shaft diameter, torque capacity 1.96 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0812A
Model: EWC0812A
Low-load small one-way clutch with synthetic resin spring. For 8 mm shaft diameter, torque capacity is 1.18 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch 1WC0815
Model: 1WC0815
A high-load small one-way clutch with metal spring. For 8 mm shaft diameter, with torque capacity of 2.65 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch 1WC0812
Model: 1WC0812
A small, high-load one-way clutch with metal spring. For 8 mm shaft diameter, torque capacity is 1.96 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0809C
Model: EWC0809C
Small high-load one-way clutch with synthetic resin spring. For 8 mm shaft diameter, torque capacity 0.88 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0809A
Model: EWC0809A
Low-load, small one-way clutch with synthetic resin spring, for 8 mm shaft diameter. Torque capacity is 0.49 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch 1WC0612
Model: 1WC0612
High-load small one-way clutch with metal spring. For shaft diameter 6 mm, torque capacity 0.88 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch 1WC0608
Model: 1WC0608
High-load small one-way clutch with metal spring. For shaft diameter 6 mm, torque capacity is 0.44 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0608C
Model: EWC0608C
High-load small one-way clutch with synthetic resin spring. For 6 mm shaft diameter, torque capacity is 0.44 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0608A
Model: EWC0608A
Small low-load one-way clutch with synthetic resin spring. For 6 mm shaft diameter, torque capacity is 0.25 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0406A
Model: EWC0406A
Low-load small one-way clutch with synthetic resin spring. For shaft diameter 4 mm, torque capacity is 0.08 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0608XC
Model: EWC0608XC
Compact high-load one-way clutch with synthetic resin spring. For shaft diameter 6 mm, torque capacity is 0.44 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0608XA
Model: EWC0608XA
Low-load small one-way clutch with synthetic resin spring. For shaft diameter 6 mm, torque capacity is 0.25 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0606XC
Model: EWC0606XC
High-load compact one-way clutch with synthetic resin spring. For shaft diameter 6 mm, torque capacity is 0.19 N-m.
JTEKT Corporation
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One-way clutch
Small One-Way Clutch EWC0406C
Model: EWC0406C
High-load small one-way clutch with synthetic resin spring. Suitable for 4 mm shaft diameter, with torque capacity of 0.15 N-m.
JTEKT Corporation
How to choose One-way clutch
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1. Select an inner diameter that matches the shaft diameter
The applicable shaft diameter of the listed products is 4 to 12 mm. Because the rollers contact the shaft surface directly to transmit torque, the shaft's outer diameter, surface hardness, and surface finish affect clutch operation and service life. Verify the shaft dimensional tolerances and surface treatment against the manufacturer's recommended values.
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2. Allow margin in the load torque
The torque capacity of the listed products is 0.08 to 6.28 N·m. Even at the same shaft diameter of 10 mm, capacity ranges from 1.18 N·m for the low-load type to 2.35 N·m for the high-load type. Estimate the maximum load, including impact torque during start-up and stopping, and select a model with sufficient capacity margin.
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3. Match the outer diameter to the housing dimensions
The outer diameter is 8 to 18 mm. Because the outer ring is fixed in the housing by press fitting or molding, design the bore diameter and fit to match the outer diameter. Even at the same shaft diameter, the outer profile varies with width and load type, so confirm it together with the available mounting space.
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4. Prevent creep with the outer ring projections
Projections on the outer circumference of the outer ring prevent creep, the phenomenon in which the outer ring slips and rotates within the housing. The number of projections is 4 to 8. The housing requires matching groove shapes for the projections, so confirm the number and arrangement on the drawing.
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5. Choose the spring material and mounting method
Metal-spring types support high loads. Synthetic-resin-spring types support insert molding (a method in which the part is embedded during molding of a resin component). When integrating the clutch into a resin gear or pulley, confirm whether the product is suitable for insert molding.
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6. Check the operating temperature
The characteristics of the pre-packed grease and resin springs change with temperature. Consider internal heat generation and the installation environment, and confirm that the ambient temperature falls within the product's specified operating temperature range.
This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.