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LICAT linear transmission systems are highly adaptable and customizable to meet specific customer needs. They feature rack and pinion mechanisms available in thirteen metric module sizes, constructed from various materials with different heat treatments, quality levels, and surface finishes. These systems can support weights exceeding 36,000 Kg on the rack axis. The racks and pinions undergo hardening heat treatment to ensure smooth and silent motion transmission, even under heavy loads. Helical versions offer an increased coverage ratio, reducing stress on the teeth.
Type A: Made from UNI C45 (AISI-SAE 1045) material, hardened and tempered to R ≥ 70 Kg/mm², suitable for standard applications with low performance requirements.
Type B: Also made from UNI C45, but with induction hardening and tempering to HRC ≥ 52, providing excellent performance at relatively low costs.
Type C: Made from UNI 18NiCrMo5 (AISI-SAE 4320), casehardened and tempered to HRC 58-62, offering high performance and safety characteristics for high-performance applications.
The DMD and DME diagrams assist in selecting the appropriate rack module and number of pinion teeth for different toothing types and material versions.
The document outlines guidelines for selecting the appropriate rack and pinion module based on the required tangential force and linear speed. It details the process for determining the correct number of pinion teeth, considering factors such as torque, motor-reduction unit availability, and rotation speed. Static and dynamic safety coefficients are used in calculations to ensure flexibility and appropriate Hertz pressure for the materials and heat treatments used. These calculations assume ideal operating conditions without shocks or structural distortion, with continuous lubrication and correct assembly. A safety coefficient between 2 and 4 should be applied based on specific experience and actual operating conditions.
Input Data: Mass to be lifted: 500 daN, Rack-pinion mechanism output: ≅ 0.95, Linear speed: 1 m/sec, Gravity acceleration: 9.81 m/sec², Acceleration: 3 m/sec², Safety coefficient: 3.
Output Data: Real vertical tangential force (Fvr): 640.5 daN, Virtual vertical tangential force (Fvv): 1921.5 daN. The rack and pinion mechanism is defined using the "DMD – DME" module choice diagrams with induction hardened and tempered material, straight toothing, module 5, and declared tangential force ≥ 2800 daN. Material: UNI C45 (AISI-SAE 1045) Hardened & Tempered HRc≥52.
Input Data: Mass to be moved: 500 daN, Rack-pinion mechanism output: ≅ 0.95, Linear speed: 1 m/sec, Friction coefficient: 0.05, Acceleration: 3 m/sec², Safety coefficient: 3, Gravity acceleration: 9.81 m/sec².
Output Data: Real horizontal tangential force (For): 174.5 daN, Virtual horizontal tangential force (Fov): 523.5 daN. The rack and pinion mechanism is defined using the "DMD – DME" module choice diagrams with hardened and tempered material, helical toothing, module 4, and declared tangential force ≥ 810 daN. Material: UNI C45 (AISI-SAE 1045) Hardened & Tempered.
For users with dimensional constraints, such as pinion clearance or distance between centers, the correct number of teeth can be established using the characteristics of the chosen motor-reduction unit. Example calculations provide guidance on determining the pitch diameter and number of pinion teeth based on available specifications.
Catalog excerpts
SRL Sistemi di trasmissione lineare di alta precisione High-precision linear transmission systems Systèmes de transmission linéaire de haute précision Linearen Hochpräzision Antriebssystemen Sistemas de transmisión lineal de alta precisión
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Technical spcifications and dimensions
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DESCRIPTION AND CHARACTERISTICS “LICAT” linear transmission systems have many uses and can also be adapted to Customers specific requirements. In order to satisfy Customers requirements, LICAT can offer rack and pinion mechanisms in thirteen metric module sizes, made up of different materials, together with differing heat treatments, quality levels and surface finishing, to cover a range of liftable weights corresponding to over 36000 Kg on the rack axis. In particular, the racks and pinions which undergo hardening heat treatment have quality finishing on both flat surfaces and on tooth profiles....
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This allows for better specific friction distribution, with good contact between the teeth along the whole meshing area, higher contact and covering ratios, to giving longer life, smoothness and lack transmission noise under load, with considerably lower vibrations and stress at the e toothing base. In addition, all the surface except the toothing is suitably protected from heat treatment to allow for any subsequent machining operations. DIAGRAMS TO HELP WITH THE CHOICE OF RACK MODULE AND NUMBER OF PINION TEETH The “DMD – DME” diagrams have been prepared for each type of toothing (straight and...
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N. B.: Should the user have any dimensional restraints (pinion clearance, distance between centres, etc.), it is possible to establish the correct number of teeth by using the characteristics of the chosen motor-reduction unit. Supposing a pinion outside diameter of no more than 110 mm, the characteristics of the motor-reduction unit to be applied to the pinion are defined as follows: Number of pinion teeth available in table (Z) Z = 18 Corresponding pitch diameter (dp) dp = 95,5 Torque on pinion (M) 2 100 ç dp Fvr M × × = × 322 N m 2 100 0,95 95,5 640,5 M = × × = × Pinion speed (n) Z m ð V 60...
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32 PINION WITH STRAIGHT TEETH m=12 CASEHARDENED &TEMPERED MATERIAL TABLE PDR-C-1200 Revision:"00" Material: UNI 18NiCrMo5 (AISI-SAE 4320) - Casehardened & tempered teeth HRC 58+62 0.8/ Toothing accuracy: class 6 DIN 3962 - Tooth finishing V- Toothing with crawned profile - Pressure angle: 20° m=Module - Z=Number of teeth - D=Assembly clearance - dp=Correct pitch diameter |1^10.021 A~|ח| 122 r-|/|0.02| A~h| L 1 1 1 .120 y co V7^777\ (D Q-| "O"O Q G 0.8/t :.4-V«&- W77ZZA Forma 1 Forma 2 H@|0.03| Identifier code example : PDR - C -1200 -18/1 N FOR MESHING WITH RACK CDF-A-SF / CDF-A-CF D©nomination Shape...
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49 PINIONWITHADAPTERTYPEPH CASEHARDENED & TEMPERED MATERIAL TABLE PFA-PH Revision:"00" PH7/PH8 PH9 0,01 CMCO Q 0,01 "D Q co co Q 11x0S4 Identifier code example for pinion with straight teeth m=4 - Z=18 : PFA-PH7-4 / PDR-C-400-18/1S Identifier code example for pinion with helical teeth m=4 - Z=18 : PFA-PH7-4 / PER-C-400-18/1S FOR MESHING WITH RACK -CDR-B-SF / CDR-B-CF / CDR-C-SF / CDR-C-CF -CER-B-SF / CER-B-CF / CER-C-SF / CER-C-CF Dnomination module d e V a b C f L S2H7 S3 S4 h PFA-PH7-4 / PINION TYPE 4 50 80 100 36 15 5 39 55 8 15 9 CD PFA-PH7-5 / PINION TYPE 5 50 80 100 50 15 5 53 69 co 15...
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50 PINIONWITHADAPTERTYPEPHQ CASEHARDENED & TEMPERED MATERIAL TABLE PFA-PHQ Revision:"00" Identifier code example for pinion with straight teeth m=4 - Z=18 : PFA-PHQ7-4 / PDR-C-400-18/1S Identifier code example for pinion with helical teeth m=4 - Z=18 : PFA-PHQ7-4 / PER-C-400-18/1S FOR MESHING WITH RACK -CDR-B-SF / CDR-B-CF / CDR-C-SF / CDR-C-CF -CER-B-SF / CER-B-CF / CER-C-SF / CER-C-CF Dnomination module d e V a b C f L S3 S4 h PFA-PHQ7-4 / PINION TYPE 4 50 80 100 36 18 5 39 58 18 11 10 PFA-PHQ7-5 / PINION TYPE 5 50 80 100 50 18 5 53 72 18 11 10 PFA-PHQ8-6 / PINION TYPE 6 80 125 160 55 24 7...
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53 D GEAR BOX ZERO BACKLASH VERTICAL MOTOR INSIDE LUBRICATION TABLE MCCA Revision:"01" si L 016 H7 (2x) 018 (6x) *\ K9 ail le 1 130 191 130 12 :o 1" n 344 Module Dnomination f V t i MCCA-401-DM 700 12 5 68 MCCA-401-DV 700 18 7 45 MCCA-401-EM 700 12 5 68 MCCA-401-EV 700 18 7 45 MCCA-501-DM 1000 12 7 80 MCCA-501-DV 1000 18 10 53 MCCA-501-EM 1000 12 7 80 MCCA-501-EV 1000 18 10 53 J 22 D 91,87 99,13 36 20 E 90,31 100,69 20 D 112,32 78,68 50 18 E 110,07 80.93 f [doN] = tangential force tooth/rack v [m/T] = max speed to rack t [Nm] = input torque motor 3000 r.p.m i = total ratio r = size reducer Z...
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55 ZERO BACKLASH GEAR BOX VERTICAL MOTOR RECIRCULATING LUBRICATION TABLE MCCC Revision:"01" si ^§^r<^ii~| 016 H7 (2x) Ԡ 018 (6x) 130 130 c 1 1: :o 191 344 Module Dnomination f V t i MCCC-401 -DM 700 12 5 68 MCCC-401 -DV 700 18 7 45 MCCC-401-EM 700 12 5 68 MCCC-401-EV 700 18 7 45 MCCC-501 -DM 1000 12 7 80 MCCC-501 -DV 1000 18 10 53 MCCC-501-EM 1000 12 7 80 MCCC-501-EV 1000 18 10 53 Z D A a J 22 D 91,87 99,13 36 20 E 90,31 100,69 20 D 112,32 78,68 50 18 E 110,07 80.93 f [doN] = tangential force tooth/rack v [m/V] = max speed to rack t [Nm] = input torque motor 3000 r.p.m i = total ratio r = size...
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56 m^1 GEAR BOX ZERO BACKLASH HORIZONTAL MOTOR INSIDE LUBRICATION TABLE MCKA Revision:"01 " S 016 H7 (2x) luntm 018 (6x) -a /Sa. CM 130 130 !36 191 L m o CM O) N- 60 145 145 344 Module Dnomination f V t i Z D MCKA-401 DM MCKA-401-DV 700 700 12 18 5 7 68 45 22 D 91,87 MCKA-401-EM MCKA-401-EV 700 700 12 18 5 7 68 45 20 E 90,31 MCKA-501-DM 1000 12 7 80 MCKA-501-DV 1000 18 10 53 20 D 112,32 MCKA-501-EM 1000 12 7 80 MCKA-501-EV 1000 18 10 53 18E 110,07 36 50 f [doN] = tangential force tooth/rack v [m/1'] = max speed to rack t [Nm] = input torque motor 3000 r.p.m i = total ratio r = slze reducer Z...
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57 n n/nr>/vi-1 ZERO BACKLASH GEAR BOX TABLE HORIZONTAL MOTOR MCKB OUTSIDE LUBRICATION Revision:"01" | Module Dnomination f V t i MCKB-401 -DM 700 12 5 68 MCKB-401 -DV 700 18 7 45 MCKB-401-EM 700 12 5 68 MCKB-401-EV 700 18 7 45 MCKB-501 -DM 1000 12 7 80 MCKB-501 -DV 1000 18 10 53 MCKB-501-EM 1000 12 7 80 MCKB-501-EV 1000 18 10 53 H-HHr J 22 D 91,87 99,13 J 20 E 36 90,31 100,69 -h \ 20 D 112,32 78,68 50 18 E 110,07 80.93 f [doN] = tangential force tooth/rack v [m/T] = max speed to rack t [Nm] = input torque motor 3000 r.p.m i = total ratio r = size reducer Z = number teeth pignon D = straight...
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