Червячный редуктор серии RV / Синхронный червячный редукторный двигатель для винтового домкрата

 

RV Series Worm Gear Reducer — RV025 to RV150, Motor Direct-Coupled

Технические характеристики

The configuration table below covers housing material, shaft material, input/output options, installation methods, lubrication type, and ratio range. The model parameter table that follows gives the specific shaft diameters and power range for each RV frame size — use these figures when verifying motor shaft and coupling compatibility.

Model Parameters — RV025 to RV150

All shaft diameters below are nominal; actual dimensions are confirmed on dimensional drawings supplied with order. Input/output hole diameters in parentheses indicate alternative sizes available within that frame.

How the RV Worm Drive Reduces Speed and Multiplies Torque

The RV червячный редуктор converts the high-speed rotary motion from the input motor to low-speed, high-torque output through a crossed-axis worm-and-wheel mesh. The worm shaft — a helical screw thread precision-ground from 20Cr steel and hardened to 56–62 HRC — engages the worm wheel at 90 degrees. Each complete turn of the worm advances the wheel by one tooth, so a wheel with 40 teeth and a single-start worm produces a 40:1 ratio.

Contact geometry is line-contact along the worm helix rather than point-contact as in a crossed helical gear. This spreads load over a longer arc, improving torque capacity and heat distribution across the tooth mesh. At gear ratios of 20:1 and higher with a single-start worm, the output shaft is self-locking under static load — a property that eliminates the need for a separate holding brake on vertical screw jacks, gate actuators, and vertical conveyors.

The worm shaft surface hardness of 56–62 HRC with a residual carburised layer of 0.3–0.5 mm after precision grinding ensures the worm contact face resists wear even under continuous cyclic loading characteristic of screw jack and jump form systems, where the gearbox operates under repeated load reversal as the form moves up and resets.

Why the RV Series Is Specified for Synchronous Drive Systems

 

Where the RV Series Worm Gear Reducer Is Used

▸ Screw Jack Jump Form Systems — Construction

A jump form system for high-rise concrete construction uses multiple screw jacks positioned around the formwork perimeter. Each jack must extend and retract in synchrony — within a few millimetres of each other — to prevent the formwork from racking. The RV series червячный редуктор is coupled directly to a synchronous AC motor or controlled by a servo drive at each jack point. The self-locking worm holds the formwork in position during concrete pour without continuous motor power. Typical configuration: RV090 or RV110 at 30:1–50:1, motor power 0.75–2.2 kW per jack.

▸ Industrial Screw Jacks — Multi-Point Lifting

Multi-point screw jack arrays used for lifting and positioning heavy industrial loads — press platens, machine bases, mould clamping systems — require all jack points to move at identical speed and stop within sub-millimetre tolerance. A common driveshaft or synchronised servo drives all RV gearboxes simultaneously. The worm gear's inherent self-locking protects the load if any single drive fails mid-lift. RV110–RV150 at 50:1–100:1 covers the typical torque range for 5–50 tonne multi-point jack arrays.

▸ Food Processing Conveyor Lines

In multi-zone conveyor systems — such as a pasteuriser tunnel with separate approach, treatment, and exit belt sections — the speed of each zone must be independently controlled but synchronised to the overall line speed. Small RV series units (RV040–RV063) at ratios of 20:1 to 40:1, paired with AC or servo motors, provide the independent speed control and positional stability needed for each conveyor zone, with the stainless steel housing option available for the wash-down zones. For more червячный редуктор options across all configurations and frame sizes, see the product category.

Motor-to-Gearbox Connection — What to Check Before Assembly

Four items must be verified before finalising the motor and gearbox combination:

• ◉ Motor shaft diameter vs. input hole diameter. The motor output shaft must fit within the gearbox input hole — or within the acceptable alternative diameters listed in the model parameter table (figures in parentheses). Do not force an oversized shaft into the bore.
• ◉ Motor input speed vs. gearbox maximum input speed. The motor's rated speed must be less than or equal to the gearbox's maximum input speed for the selected frame size. Exceeding the maximum input speed accelerates worm-to-wheel sliding wear.
• ◉ Motor rated torque × reduction ratio vs. gearbox rated output torque. The product of motor torque and reduction ratio must not exceed the gearbox rated output torque. Overloading output torque breaks bronze worm wheel teeth.
• ◉ Motor flange size vs. gearbox input flange standard. IEC-normalised flange codes (e.g. 71B14, 80B5) must match between motor and gearbox. Confirm the IEC frame code from the motor nameplate against the table for the relevant gearbox frame.

For applications requiring precise positioning or synchronisation, a servo motor paired with an RV series червячный редуктор and feedback encoder provides closed-loop position control.

Согласованные компоненты привода

The gearbox is one link in the drive chain. Worm wheel alloy, worm shaft surface hardness, and coupling alignment each affect the system's service life and reliability. The three component types below are supplied alongside this gearbox — ask for combined pricing when placing your order and we will verify dimensional compatibility before dispatch.

Часто задаваемые вопросы

What is the difference between the aluminium housing (RV025–RV090) and cast iron housing (RV110–RV150)?

→ The aluminium alloy die-cast housings on smaller frames provide lower weight and adequate rigidity for torques up to approximately 800 Nm. Above that range, cast iron offers higher housing stiffness, better damping of gear mesh vibration, and greater resistance to distortion under heavy radial and axial shaft loads. The material change at the RV110 boundary reflects the engineering trade-off: lighter aluminium where weight matters, stiffer cast iron where load rigidity matters more.

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Can the RV series be used with a brake motor for vertical load applications?

→ Yes, and it is sometimes recommended in combination. At ratios of 20:1 and above, the worm gear is self-locking under static load, so the load holds position when the motor is off. However, a brake motor is advisable in applications where dynamic braking during deceleration (rather than just static holding) is required, or where the application must satisfy formal fail-safe certification requirements that demand a positive braking mechanism independent of the drive.

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What is the maximum input speed for these worm gear reducers?

→ Maximum input speed is frame-size and ratio dependent. As a general guide for the RV series, the rated maximum input is 1,400–1,500 rpm (standard 4-pole 50 Hz motor speed) for most frame sizes and ratios. At ratios of 5:1 and 7.5:1, the higher output speed means oil film formation is more demanding — confirm maximum input speed against the specific performance table for your chosen model and ratio before specifying a variable speed drive that will run above motor rated speed.

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How do I synchronise multiple RV gearboxes in a screw jack system?

→ Two methods are standard. The simpler approach is a common driveshaft: all gearboxes share a single input shaft driven by one motor, so they rotate at exactly the same speed by mechanical constraint. The more flexible approach uses individual motors per gearbox, controlled by a PLC or motion controller that synchronises drive commands via encoder feedback. The second approach allows variable load distribution across jack points and can compensate for small position errors detected by position sensors on each jack.

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What output shaft configurations are available and when would I choose each?

→ Keyed hollow shaft output accepts a leadscrew, spindle, or shaft with a key connection — the most common configuration for screw jacks. Hollow shaft with output flange connects to a flange-type coupling or directly to the driven component face plate. Plug-in solid shaft output provides a protruding shaft for belt pulley, chain sprocket, or coupling hub mounting. The right choice depends on your downstream component connection type; dimensional confirmation against the product drawing is required before ordering.

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Is grease lubrication or oil-bath lubrication better for my application?

→ Oil-bath and splash lubrication is standard for continuous-duty, higher-speed applications — the worm and wheel are partially submerged in oil for consistent film formation under load. Grease lubrication is specified for low-speed, intermittent duty or where an oil-bath unit would leak (e.g. certain vertical mounting positions where the oil would drain away from the mesh). For screw jack and jump form applications that cycle under heavy load, oil-bath lubrication with ISO VG 220 gear oil is the standard specification.

Что говорят клиенты

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Bae Seong-jun, Construction Equipment Engineer, Gyeonggi-do (2024)

"Specified RV110 at 40:1 with servo motors for a 6-point jump form system. The synchronisation precision was better than we expected — all six units tracked within 0.5 mm across a 12-metre form span. Self-locking held the form dead during a 90-minute power outage on site without any movement. Very pleased."

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Kim Sang-hyuk, Plant Machinery Technician, Incheon (Q4 2024)

"We run three RV090 units on a 4-tonne press platen levelling system. The cast iron transition at RV110 was the right call for us — we actually stepped down to RV090 aluminium to save weight, and it has held up fine at the load levels we're running. Already on the second year of operation."

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Choi Min-soo, Automation Engineer, Busan (2025)

"Used RV040 and RV050 on a food conveyor multi-zone line. Easy motor swap — IEC flange matched our existing motors without any adapters. Noise level is low enough that we don't need acoustic enclosures in the production area."

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Park Joon-ho, Mechanical Engineer, Seoul OEM (late 2024)

"Documentation is thorough — dimensional drawings in DWG format available on request made integration into our CAD model straightforward. The RV130 stainless option resolved our corrosion issue in the wash-down zone without needing to switch to a different product family."

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Lee Kang-won, Procurement, Daejeon Construction Equipment Co. (Q1 2025)

"Ordered 12 RV110 units for a jump form rental fleet. Delivery was 7 days from confirmation. Units were pre-filled, tested, and packed with inspection records. Saved us incoming inspection time on each unit."

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Yoon Ji-hwan, Production Manager, Ulsan Industrial Machinery Maker (2024)

"We manufacture multi-point screw jack lifting tables for the automotive assembly sector. The RV series covers our entire torque range with one supplier. Having the same housing bolt pattern scale consistently across frame sizes simplified our table design significantly."