Šnekový převod VRV030 | Náhrada pro Ondrives Rino P70

VRV030 Large-Frame Worm Gearbox — P70 Series, 6.4 kg, Fr2 800 N

Technical Specifications — VRV030 P70

Mechanical & Lubrication Parameters

P70 Series — Ratio, Efficiency, Backlash & Inertia Table

Suffixes: norma = backlash ≤0.50°; A = ≤0.13°; AR = ≤0.066°. Efficiency at nominal 1,000 rpm input. Reflected inertia at input in kg·m². Lead direction: Right Hand throughout.

Values are at nominal input speed, for guidance. Test in your application. Cooling may be needed at higher duty cycles or ambient temperatures.

Ratio Selection and Load Capacity Guidance

The P70 large centre distance allows the worm shaft to sustain much higher input shaft radial loads (200 N) than the P45 (60 N) or P15 (10 N). This matters when a timing pulley, gear, or belt drive is mounted on the worm shaft input — any eccentric load from the drive geometry contributes directly to Fr1. At 200 N, the P70 can accommodate a 2GT belt drive or small spur gear on the input shaft without approaching the radial load limit, whereas the P45 and P15 are essentially restricted to direct coupling inputs to stay within Fr1.

On the output side, Fr2=800 N at the P70 frame opens up applications that P45 cannot handle: a 5 kg robotic arm link at 0.25 m radius generates approximately 490 N of radial force at the wrist joint output shaft under 1g gravity load (neglecting dynamic effects) — which puts the P45 at Fr2=450 N over limit in the static case, but remains within the P70's 800 N limit with margin for dynamics. At the 10:1 ratio and 90% efficiency, the P70 is also well-suited to back-drivable joint designs in heavier collaborative robots.

The 120:1 P70 with 50% efficiency provides reliable static self-locking for vertical mechanisms. At 50% efficiency, the lock is marginally less secure than the P45's 47% at 120:1 (the P70 is 3 percentage points closer to the theoretical self-locking boundary) — in practice both are securely self-locking under the design static loads, but for safety-critical holding applications the static lock should always be confirmed experimentally under the actual load and temperature conditions of the installation.

Why the P70 Large Frame is Specified

Primary Applications

▸ Heavy Industrial Robotics & Large Robot Joints

Industrial robots with payload ratings of 10–30 kg use shoulder, elbow, and wrist joints that must sustain significant gravity and dynamic loads on the output shaft bearings. The P70 at 15:1 or 20:1 with class A or AR backlash covers this segment. At 20:1 (85% efficiency, Fr2=800 N, Fa2=600 N), a robot elbow joint carrying a 6 kg forearm plus a 5 kg end-effector generates output shaft radial loads in the 100–400 N range depending on arm configuration — well within the P70 envelope. For articulated robot bases using a worm gearbox for the base slew rotation, the 30:1 or 60:1 P70 provides suitable self-locking for safe stopping.

▸ Antenna Pointing, Satellite Positioning & Optical Drives

Ku-band and Ka-band VSAT terminals in the 60–120 cm aperture class, tracking antennas for UAV communications, and electro-optical telescope mounts all require fine angular positioning with minimal backlash under substantial structural loads. The P70-AR at 20:1 or 30:1 provides the combination of precision (≤0.066° backlash), load capacity (Fr2=800 N), and efficiency (85%/78%) that these applications demand. For a 90 cm antenna dish weighing 12 kg, the radial load on the elevation axis output shaft can reach 400–600 N under maximum wind loading — within P70's Fr2 limit. The grease lubrication performs reliably in outdoor environments from −20°C to +60°C without oil level inspection or drain-back concerns.

▸ Military Equipment & Precision Optical Systems

Unmanned ground vehicle steering joints, turret slew mechanisms (at reduced scale), electro-optical gimbal axes, and surveillance camera pan/tilt units in the 5–15 kg camera/sensor class are natural applications for the P70. The load capacity handles the structural weight; the AR class provides the angular precision; the grease lubrication eliminates oil management in deployed environments. The reflected inertia data in the specification table is the kind of quantified parameter that defence procurement engineers need for control system verification — and it is available for every ratio across all three backlash classes.

Ondrives & Rino P70 Replacement Compatibility

The VRV030 P70 is an aftermarket-compatible replacement for the Ondrives & Rino P70 worm gear reducer. Korea Ever-Power is not affiliated with Ondrives & Rino and the VRV030 is not an OEM part. For original parts, contact the original manufacturer.

Kontakt Korea Ever-Power for dimensional drawings and test certificates. Sample testing before fleet replacement is recommended for all precision applications.

Shodné komponenty pohonu

At the P70 load level, replacing the worm wheel with an incorrect alloy grade or profile tolerance can quickly degrade the backlash class of an AR-specified unit during early service. Sourcing wear components from Korea Ever-Power ensures the replacement wheel and shaft maintain the original precision class.

Často kladené otázky

Why is the P70's reflected inertia at 10:1 so much higher than the P45's?

→ Reflected inertia scales with the fourth power of the worm gear radius — doubling the worm diameter increases the reflected inertia by 16×. The P70 has a significantly larger worm and wheel than the P45 to achieve 800 N Fr2 from the output shaft bearing. That larger geometry is what makes the P70's 6.04×10⁻⁵ kg·m² (at 10:1) approximately 10× the P45's 6.15×10⁻⁶ kg·m². When upgrading from P45 to P70, the servo drive must be retuned for this increased reflected inertia.

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Is the P70 truly self-locking at 120:1?

→ At 50% efficiency the P70 at 120:1 is in the self-locking range under static conditions. However, the self-locking condition is sensitive to temperature, vibration, and lubrication state — at elevated temperatures, grease viscosity decreases and the friction coefficient drops, moving the operating point closer to the back-drive threshold. For safety-critical hold applications, always test the static lock under the actual load, temperature, and vibration conditions of the installation. Do not rely solely on the efficiency figure for safety-critical mechanical holding without experimental verification.

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What is the maximum static axial load the P70 output shaft can sustain?

→ The rated maximum output axial load is Fa2=600 N in the published specification. This is the continuous rated value. Short-duration peak loads above this can be tolerated by the output shaft bearing, but continuous loading above Fa2=600 N will reduce bearing life. If your application has an axial load component that exceeds 600 N, contact Korea Ever-Power with the load profile — it may be possible to accommodate higher axial loads through bearing selection or preload adjustment, or a different frame size may be more appropriate.

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Can the P70 be used in a horizontal shaft orientation?

→ Yes. The grease lubrication (Shell Gadus S5) makes the P70 fully orientation-independent — horizontal, vertical, inverted, or angled shaft configurations all work without oil displacement concerns. This is one of the primary design advantages over oil-bath gearboxes when used in robotic or gimbal applications where the housing orientation changes during operation.

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How often should the Shell Gadus S5 grease be replenished in the P70?

→ Shell Gadus S5 V4P 2.5 is a long-life synthetic grease designed for continuous duty in precision gearboxes. Under normal operating conditions (ambient temperature within the rated range, load within the rated Fr2 and Fa2), the grease life in the P70 is typically 8,000–12,000 hours. At elevated temperatures (above 50°C continuous) or under sustained high load near the Fr2 limit, grease life shortens. For critical applications, we recommend a grease replacement at the first 1,000-hour interval and then every 5,000 hours thereafter — or after any period of unusual overload or overtemperature.

Co říkají zákazníci

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Kim Tae-young, Robot Design Engineer, Incheon Industrial Robot OEM (2024)

"Used P70-20A for the shoulder joint on a 10 kg payload industrial robot. The 85% efficiency at 20:1 allows back-drivability for our collaborative mode. Measured backlash at delivery: 0.10°, within A-class spec. Servo tuning took longer than expected due to the high reflected inertia — the published 3.57×10⁻⁵ figure at 20:1 matched our measured system inertia closely. Cost about 45% less than the OEM unit."

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Choi Sung-hyun, RF Systems Engineer, Seoul Defence Electronics Co. (Q3 2024)

"Antenna azimuth drive on a tactical communications vehicle — P70-30AR. The 78% efficiency at 30:1 gives us enough self-locking to hold pointing in field conditions without a supplementary brake. AR class backlash tested at 0.055° on the first sample unit. Compact enough to fit the available envelope. Delivered with dimensional certificate as requested."

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Park Jae-hyun, Mechanical Design Lead, Daejeon Telescope Equipment Maker (2025)

"P70-15AR for an amateur observatory mount elevation axis. 86% efficiency and 800 N Fr2 capacity handles a 12 kg OTA at slew rates up to 5°/second without any resonance issues. The reflected inertia data enabled accurate servo design from simulation — no surprises during commissioning. Running six months without backlash degradation."

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Lee Dong-hoon, Automation Engineer, Gyeonggi-do Precision Machine Tool Maker (late 2024)

"P70-20AR for a tool turret rotation axis where we replaced a heavier planetary stage + brake combination. The worm's self-locking at higher ratios was not what we needed (we use 20:1 for back-drivability), but the AR class backlash gave us the positioning we needed on a much smaller mechanical package. Weight saving of 2.1 kg vs the previous solution."

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Yoon Beom-seok, Systems Integration Engineer, Busan UAV Technology Co. (Q4 2024)

"Gimbal elevation axis on a payload stabilisation mount — P70-12A. The grease lubrication was the key requirement: the gimbal tilts through ±90° so an oil-bath unit was not an option. A class backlash was adequate for the stabilisation loop bandwidth. Three units deployed for over 8 months without any lubrication-related issues."