YL/JLAYL / YLD Flange Coupling (GB/T 5843-86), YL-I/II/III Flange Coupling (JB/ZQ 4376-2006), JLA / JLB Radial-Key Rigid Coupling (JB/ZQ 4377-2006)
YL, JLA/JLB Rigid Flange Couplings LONGXUAN YL/JLA
Longxuan rigid couplings: they do not compensate shaft misalignment and require accurate alignment. YL/YLD are flange couplings to GB/T 5843-86 (YLD with a centring spigot): 18 sizes, 10–20,000 N·m, bores 10–180 mm, hubs of cast iron or cast steel. YL-I/II/III to JB/ZQ 4376-2006: 10 sizes, 63–100,000 N·m, bores 22–250 mm. JLA/JLB to JB/ZQ 4377-2006 transmit torque through a radial key between the hubs and are fixed to the shafts with tangential or gib-head keys: 1,000–80,000 N·m, bores 40–250 mm; JLA allows axial movement. Counterpart: GOST 20761-96 flange couplings.
Specifications
- Type
- rigid couplings — no misalignment compensation, accurate alignment required
- Rated torque
- YL/YLD 10–20,000 N·m; YL-I/II/III 63–100,000 N·m; JLA/JLB 1,000–80,000 N·m
- Bore range
- YL/YLD 10–180 mm; YL-I/II/III 22–250 mm; JLA/JLB 40–250 mm
- Max. speed
- YL/YLD 1,400–8,100 rpm (cast iron), 2,300–13,000 rpm (steel); YL-I/II/III 1,200–6,300 rpm; JLA/JLB — rim speed up to 50 m/s
- Versions
- YL basic, YLD with centring spigot; YL-I with centring tenon, YL-II with centring ring, YL-III without centring; JLA axially movable, JLB fixed
- Shaft connection
- keyed; JLA/JLB with tangential keys (12,500–80,000 N·m) or gib-head keys (1,000–63,000 N·m)
- Standards
- GB/T 5843-86 (YL/YLD), JB/ZQ 4376-2006 (YL-I/II/III), JB/ZQ 4377-2006 (JLA/JLB)
- GOST counterpart
- GOST 20761-96 (flange couplings)
Applications
- Built-up line shafts and shaft lines
- Common-baseplate drives with accurate alignment and steady load
- Low-speed heavy-machine shafts on tangential keys (JLA/JLB)
- Shaft lines needing axial mobility of the joint (JLA)
We will select the right size for your task and prepare a quotation under a direct SDS contract.
