English
The QY series is a series of special hardened helical gear reducers designed specifically for crane mechanisms. The hardened tooth surface technology is used and is suitable for the trolley operation, winch, and carriage operation of cranes. It can also be extended to lifting transmission occasions of machinery in transportation, metallurgy, mining, chemical industry, and light industry. The QY series is characterized by high load capacity, long life and low noise. It supports reliable operation under heavy load conditions, has a wide range of transmission ratios and high efficiency, and is widely used in bridge cranes, gantry cranes and other equipment.
1. (a)QY...S - 3 Point Mounting
2. (b)QY...D - Foot Mounted
| Item | Parameters |
| Gear Circumferential Speed | ≤20m/s |
| High Speed Shaft Speed | ≤1500r/min |
| Operating Temperature | -40℃~+45℃ |
| Capable of Forward and Reverse Operation | |
High Load Capacity: Carburized, quenched, and ground teeth offer load capacity far exceeding that of reducers with soft or medium-hard tooth surfaces.
Compact and Lightweight: The size is reduced by 2 to 4 frame sizes for the same load capacity, replacing older models such as ZQ, QJ, and ZSC.
High Efficiency and Low Noise: NILES tooth grinding and gear shaping achieve an efficiency of 0.98 per stage, significantly reducing vibration and noise.
Multi-stage Design: Small speed ratios and multiple stages, with a maximum transmission ratio of 400, meet the needs of slow-speed cranes.
Flexible Installation: Three fulcrums support vertical, horizontal, and tilting installation, providing strong adaptability.
Various Shaft Ends: Cylindrical (P), splined (H), and geared (C) shaft ends for easy installation and disassembly.
1.What is the QY Type Gear Reducer used for?
The QY Type is a hard-tooth surface gear reducer designed for crane mechanisms, including hoisting, trolley travel, and gantry travel in bridge, gantry, and tower cranes. It is also suitable for heavy-duty applications in industries like metallurgy, mining, chemical, and light industry, particularly for intermittent (S3~S5) and heavy-load conditions.
2.What are the main advantages of the QY Type Reducer?
High load-bearing capacity due to carburized, quenched, and ground gears. Compact size and lightweight, reducing 2~4 frame sizes compared to soft-tooth or medium-hard-tooth reducers. High efficiency (up to 98% per stage) with low noise (≤85dB) and vibration. Multi-stage design with transmission ratios up to 400, ideal for low-speed cranes. Flexible installation (vertical, horizontal, or angled) with three-point (QYS) or base-mounted (QYD) options. Multiple output shaft types: cylindrical (P), spline (H), or gear (C) for easy installation and maintenance.
3.What are the differences between QYS and QYD models?
QYS (Three-Point Support): Designed for suspended installation, suitable for hoisting mechanisms or compact crane setups. It offers flexibility for vertical, horizontal, or angled mounting. QYD (Base-Mounted): Features a stable base for bottom-mounted installation, ideal for heavy-duty applications like gantry travel mechanisms. Both support three-stage, four-stage, or combined configurations.
4.What power and transmission ratio ranges are available?
Power Range: 1.1 kW to 55 kW, depending on the model and stage configuration. Transmission Ratio:
Three-stage: 31.5~178 Four-stage: 112~710 Combined (three-four stage): Customizable, up to 400 for slow-speed applications.Center distance: 100~400 mm.
5.Can the QY Type Reducer replace older models like ZQ or QJ?
Yes, the QY series can replace older soft-tooth (ZQ, QJ) or medium-hard-tooth (ZSC) reducers. Its compact design and higher load capacity allow it to match or exceed the performance of these models while occupying less space and offering improved efficiency.
6.What are the output shaft options, and when are they used?
Cylindrical Shaft (P): Uses flat key connection, ideal for standard crane couplings. Spline Shaft (H): Involute spline connection, suitable for high-torque applications requiring precise alignment. Gear Shaft (C): Involute gear connection, designed for easy installation and maintenance in heavy-duty setups. Choose based on the coupling type and maintenance needs of your crane system.
7.What are the operating conditions for the QY Reducer?
Ambient Temperature: -20°C to +40°C. Altitude: ≤1000 m. Duty Cycle: Suitable for intermittent operation (S3~S5, 25%~40% duty). Environment: Non-explosive, non-corrosive settings. For special conditions (e.g., high humidity, corrosive media), consult Guomao for customized solutions.
8.How is the QY Reducer maintained?
Lubrication: Use gear oil (e.g., ISO VG220 or VG320) and check oil levels every 3~6 months. Replace oil annually or after 5000 hours of operation. Inspection: Regularly check for abnormal noise, vibration, or oil leaks. Inspect gear wear every 12 months. Cleaning: Keep the reducer clean to prevent dust or debris from affecting cooling or seals. Guomao provides maintenance manuals with detailed schedules.
