Which model is more durable, RV90 or RV75 worm gear reducer

Under the same specifications, operating conditions, and maintenance conditions, RV90 is more durable than RV75, mainly due to its higher load-bearing and fatigue resistance capabilities brought by its larger center distance (90mm vs 75mm). The specific comparison is as follows:

1. Differences in core carrying capacity

The rated torque of RV90 is about 22-850N · m, with a suitable power of 0.09-7.5kW; the rated torque of RV75 is about 12-480N · m, with a suitable power of 0.09-4kW. The worm gear and worm of RV90 are larger in size, with higher tooth contact area and bending strength. Under high load and frequent start stop conditions, the risk of tooth wear, bonding, and tooth breakage is lower, and the bearing specifications are also larger, with stronger resistance to fatigue wear.

2. Structure and heat dissipation advantages

Both are aluminum alloy die-casting enclosures, but the RV90 enclosure has a larger size and wall thickness, better rigidity, can reduce vibration and bolt loosening, and lower the risk of sealing surface oil leakage; At the same time, the heat dissipation area is larger, and the oil temperature is easier to control under high-power conditions such as 7.5kW, which can slow down the deterioration of lubricating oil and the aging speed of oil seals. When installed vertically, the distribution of lubricating oil is also more uniform, and the problem of insufficient starting lubrication is lighter.

3. Factors affecting durability and boundary conditions

(1) Adaptation to working conditions: Under light load, low speed, and stable working conditions, the difference in durability between the two is not significant; Under heavy load, high-frequency impact, and high temperature environments, RV90 has significant advantages.

(2) Maintenance factor: If RV90 is not lubricated according to specifications and installed with coaxiality exceeding tolerance, its durability advantage will be offset; On the contrary, if RV75 is well maintained, it can also operate stably for a long time.

(3) Special scenarios: Space limited, lightweight positioning scenarios, RV75 is more suitable due to its small size and light weight, without the need to pursue the load-bearing redundancy of RV90.

4. Selection suggestions

Priority selection based on load and power: When the load is ≥ 300N · m and the power is ≥ 4kW, RV90 is more durable; When the load is less than 300N · m and the power is ≤ 3kW, RV75 can meet the demand with higher cost-effectiveness.