The RV series worm gear reducer Selection must follow the three core principles of ' working condition priority, parameter matching, and safety redundancy '. Follow the following steps to gradually determine the model to ensure that it meets actual application needs:
1. Clarify core working condition parameters
(1) Load torque: Calculate the output load torque under actual working conditions
(Including rated load and impact load), the formula is =9550, where is the motor power (kW) and is the transmission efficiency of the reducer (RV series is usually 0.4-0.7, the smaller the reduction ratio, the higher the efficiency),
is the output speed (r/min). It is necessary to reserve 1.2-1.5 times the impact coefficient (1.5 for high-frequency start-stop and heavy-load conditions).
(2) Speed requirement: Determine the motor input speed
(usually 1450r/min) and the required output speed of the equipment, calculate the reduction ratio
, give priority to the standard reduction ratio of the reducer (such as 5, 10, 20, 40, 100, etc.).
(3) Installation method: clearly define horizontal, vertical, flange installation or shaft installation. Different installation methods affect the distribution of lubricating oil and the stress state (pay attention to whether the lubrication is sufficient for vertical installation).
(4) Working environment: Confirm the temperature (-10℃~40℃ is the normal range, if it exceeds the required high and low temperature resistant accessories), dust, corrosive media, etc., harsh environments require the installation of protective covers and anti-corrosion coatings.
(5) Operation mode: distinguish between continuous operation, intermittent operation, and frequent start and stop. Frequent start and stop conditions require strengthening the fatigue resistance of the bearings and worm gears.
2. Match the center distance specifications of the reducer
(1) The center distance of RV series reducers (such as RV30, RV50, RV75, RV90, RV110, etc.) is the core indicator of load-bearing capacity. The larger the center distance, the stronger the rated torque and impact resistance.
(2) Compare the manufacturer's sample and select the corresponding center distance model based on the calculated rated load torque (including impact coefficient) to ensure that the rated output torque of the reducer ≥ the calculated torque.
(3) For example: Load torque 300N·m, impact coefficient 1.3 → You need to choose a model with rated torque ≥ 390N·m. The rated torque upper limit of RV75 is 480N·m. If the load reaches 500N·m, you need to upgrade to RV90.
3. Confirm the compatibility between reduction ratio and motor power
(1) Prioritize the standard reduction ratio. Non-standard reduction ratios may reduce transmission efficiency and increase costs.
(2) Check the upper limit of the input power of the reducer to ensure that the motor power is ≤ the rated input power of the reducer to avoid excessive temperature rise and tooth surface gluing due to overload.
(3) Pay attention to the need for self-locking: If you need the self-locking function, you need to choose a single-head worm model with a reduction ratio ≥ 40 (lead angle ≤ 3.5°), and pay attention to the instability of self-locking in actual working conditions. High-risk scenarios require the installation of a brake.
4. Check additional parameters and safety redundancy
(1) Shaft diameter and connection method: Confirm the connection dimensions of the input shaft and motor shaft (such as keyway specifications), and the installation dimensions of the output shaft and load (flange, shaft extension length) to avoid installation interference.
(2) Temperature rise check: The oil temperature needs to be calculated under continuous operating conditions. If the ambient temperature is high or the heat dissipation is poor, a larger center distance model needs to be selected or a cooling fan must be installed.
(3) Protection level: Outdoor or dusty environments require IP54 or above protection level to prevent foreign matter intrusion or lubricating oil leakage.
(4) Safety redundancy: In vertical load scenarios such as lifting and lifting, whether self-locking or not, an electromagnetic power-off brake must be installed to eliminate the risk of self-locking failure.
5. Selection Verification and adjustment
(1) Combined with the manufacturer's technical support, review the Selection parameters to avoid 'small horse-drawn carts' or 'large horse-drawn carts' (the former is prone to overload damage, while the latter increases costs and reduces efficiency).
(2) If the working conditions have special requirements (such as low noise, high-precision positioning), it is necessary to choose a model equipped with a gear grinding process worm gear and precision bearing.
