RA-Gears - 32 Pages

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RA-Gears

Catalog excerpts

High Precision Gearheads

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The includes gearheads for high precision control of ATC magazines, ATC arms, APC, and turret drives of lathe machining centers.

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For NC Lathe or Combined Lathe Life Rating Allowable Acceleration/Deceleration Torque Momentary Maximum Allowable Torque Allowable Output Speed [Continuous] Allowable Output Speed [Intermittent] Torsional Rigidity, Lost Motion, Backlash Calculation of Torsion Angle Allowable Moment and Maximum Thrust Load Momentary Maximum Allowable Moment Allowable Moment Diagram Low-temperature Characteristics No-load Running Torque Appendix 1 Quick Selection Table of Product Codes RA-EA Series (Case rotating type) 21 to 24 RA-EC Series (Shaft rotating type) 25 to 28

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Examples of Use For Machining Center ATC magazine drive Cam drive for ATC arms Rotary table Contact us for NT Series rotary tables.

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For NC lathe or combined lathe ATC magazine drive Lathe turret drive RA-EA Series

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Features and Congurations High shock load capability High rigidity High precision High torque The double-ended support design and unique pin gear mechanism provide the following advantages: Heavy load support A set of internal main bearings (large angular ball bearings) enables complete support of heavy external loads. Three benets due to the above features (1) Capable of high shock load 5 times the rated torque (2) High torsional rigidity (3) Small backlash [1 arc.min] (4) High torque density (capable of high torque with downsized gear) 1. Maintenance: Trouble free 2. Compact design with a...

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Rotation of the servo motor is transmitted through the input gear to the spur gears, and the speed is reduced according to the gear ratio between the input gear and the spur gears. Since the crankshafts are directly connected to the spur gears, they have the same rotational speed as the spur gears. Fig. 1. First reduction section Crankshaft Spur gear Two RV gears are mounted around the needle bearings on the eccentric section of the crankshaft. (In order to balance the equal amount of force, two RV gears are mounted.) When the crankshafts rotate, the two RV gears mounted on the eccentric...

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Rated Torque Rated Output Speed Rated Life Speed Ratio Allowable Momentary Acceleration/ Maximum Deceleration Allowable Torque Torque The Rating Table shows the specication values of each individual reduction gear. The allowable output speed may be limited by heat depending on the operating rate. For the inertia moment of the reduction gears, refer to the Product Summary Sheet. For dimensions α and L, refer to “Allowable Moment and Maximum Thrust Load.”

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Capacity of main bearing Ns1 Allowable Allowable Backlash Output Output Speed Speed [Continuous] [Intermittent] Lost Motion Torsional Allowable Momentary Maximum Dimension Dimension Rigidity Moment Maximum Thrust α L (Spring Allowable Load Constant) Moment N-m/ arc.min. (kgf-m/ arc.min.) RA-EA Series (Case rotating type) RA-EC Series (Shaft rotating type) Servo motor Fixed part Rotating part (Case) Servo motor Rotating part (Shaft) Fixed part

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Glossary Life Rating Torsional Rigidity, Lost Motion, Backlash The life time when driven at the rated torque and rated output speed is called the “life rating.” When a torque is applied to the output shaft while the input shaft is xed, torsion is generated according to the torque value. The torsion can be shown in the hysteresis curve. The value of b/a is referred to as “torsional rigidity.” The torsion angle at the mid point of the hysteresis curve width within ±3% of the rated torque is referred to as “lost motion.” The torsion angle when the torque indicated by the hysteresis curve is...

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Allowable Moment and Maximum Thrust Load The external load moment may be applied to the reduction gear during normal operation. . The allowable values of the external moment and the external axial load at this time are each referred to as “allowable moment” and “maximum thrust load.” Note: 1. When the load moment and the thrust load are applied concurrently, ensure that the reduction gear is used within the corresponding allowable moment range, which is indicated in the allowable moment diagram. 2. When W1 load is applied in the area of the dimension L, use it within the allowable radial...

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Performance Efciency Case temperature: 30°C Lubricant: Grease (Molywhite RE00) Low-temperature characteristics (No-load running torque for low-temperature range) RA Series: Input speed Lubricant: Grease (Molywhite RE00) Speed ratio No-load running torque Input axis (N-m) No-load running torque Input axis (N-m) Speed ratio Speed ratio No-load running torque Input axis (N-m) No-load running torque Input axis (N-m)

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No-load running torque Case temperature: 30°C Lubricant: Grease (Molywhite RE00) No-load running torque on the output shaft side (N-m) No-load running torque on the output shaft side (N-m) Output shaft speed (rpm) Output shaft speed (rpm) The no-load running torque that is converted to the input shaft side value should be calculated using the following equation: No-load running torque on No-load running torque on the output shaft side (N-m) the input shaft side (N-m) = Speed ratio

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Selection Flowchart Check the load torque applied to the reduction gear. An example is shown in the load cycle diagram. (1) Examine the load characteristics ● Examine the average load torque (Tm) ● Examine the average output speed (Nm) External impact torque Tem Temporary selection of the model from the rating table Increase the model number of the reduction gear Max. torque for startup Constant torque Acceleration Constant Deceleration time time drive time Rotation load torque Load cycle diagram Lh ≥ Required life YES Examine the input speed Input YES speed Maximum allowable output Speed ≤...

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(2) Examine the main bearing capacity Check the external load applied to the reduction gear. When the load moment and the thrust load are applied concurrently, ensure that the reduction gear is used within the corresponding allowable moment range, which is indicated in the allowable moment diagram. Selection examples (1) Examine the load characteristics Usage conditions T1 = 2,500N-m T2 = 500N-m T3 = 1,500N-m Tem = 7,000N-m t1 = 0.2sec t2 = 0.5sec t3 = 0.2sec tem = 0.05sec N1 = N3 = 10r.p.m. N2 = 20r.p.m. Nem = 20r.p.m. Calculation of average load torque 10 Calculation of average output...

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