Description
Size-specific context
Where JDLB 50 sits in the range
JDLB 50 is a compact step above size 45 with the same 15 mm documented input-shaft diameter but a narrower listed axial clearance-adjustment range. The dual-lead principle lets the assembled mesh be adjusted by moving the worm axially; it does not make the bare shaft interchangeable with another family size.
JDLB 50 and 45 share some envelope values, so do not identify a replacement from one diameter alone. Use the reducer size mark, ratio and complete shaft interface dimensions.
JDLB 50 size and adjustment data
| Parameter | Specification / guidance |
|---|---|
| Series size | JDLB 50 |
| Drive concept | Dual-lead worm drive with axial backlash adjustment |
| Documented ratio contexts | 14.5, 19.5, 24.5*, 30, 40*, 50*, 60 |
| Lead-angle examples | 11°18′ at 14.5; 9°04′ at 19.5; 5°42′ at 30; 3°17′ at 60 |
| Adjustment distance V | 8 mm |
| Adjustment coefficient k | 0.015–0.03 mm⁻¹ |
| Clearance adjustment ΔSd | 0.12–0.24 mm |
| Input shaft diameter J | 15 mm |
| Envelope A / B / C | 108 / 138 / 53 mm |
| Drive-level P0 grade | 2 arc minutes |
| Drive-level P1 grade | 3–5 arc minutes |
| Documented output radial load Fr2 | 5500 N |
| Documented output axial load Fa2 | 3800 N |
| Material / heat treatment of replacement shaft | Confirm from ordered drawing or approved project specification |
Selected JDLB 50 performance references
| Ratio context | Documented performance reference |
|---|---|
| Ratio 14.5 | At n1=1400 min⁻¹: dynamic efficiency 0.80; rated input power 0.9 kW; output torque 74 Nm; output speed 96.6 min⁻¹. |
| Ratio 30 | At n1=1400 min⁻¹: dynamic efficiency 0.70; rated input power 0.6 kW; output torque 84 Nm; output speed 46.7 min⁻¹. |
| Ratio 60 | At n1=1400 min⁻¹: dynamic efficiency 0.57; rated input power 0.3 kW; output torque 68 Nm; output speed 23.3 min⁻¹. |
Adjustment data for JDLB 50
The documented adjustment range for size 50 uses V=8 mm, k=0.015–0.03 mm⁻¹ and ΔSd=0.12–0.24 mm. These values describe the reducer adjustment context and should not be converted into a standalone tooth tolerance on a replacement shaft.
Ratio, starts and replacement identification
The size-50 mesh table spans these documented ratio contexts: 14.5, 19.5, 24.5*, 30, 40*, 50*, 60. Worm start count and lead angle change with the selected ratio, so the reducer size alone is not enough to manufacture a replacement worm.
When the old shaft is worn, read the ratio plate or gearbox record and inspect the mating wheel before finalizing tooth geometry. For JDLB 50, also include the shaft end interfaces and bearing-journal dimensions in the same RFQ.
Replacement RFQ
What to send for a JDLB 50 quote
Send the size-50 reducer reference, ratio, quantity, current worm-shaft drawing or measured sample, and the mating-wheel condition. Mark any surfaces affected by wear so measured damage is not treated as intended geometry.
For JDLB 50, the order review should reflect that a compact step above size 45 with the same 15 mm documented input-shaft diameter but a narrower listed axial clearance-adjustment range. State the requested 2 arc minutes P0 or 3–5 arc minutes P1 drive grade as an assembled-mesh target and include the wheel condition plus the documented V=8 mm adjustment context.
Frequently asked questions
Why can JDLB 45 and 50 be confused during replacement?
Some documented dimensions and the input-shaft diameter overlap. The size marking, ratio, mesh data and complete shaft geometry are needed to separate them reliably.
Can JDLB 50 be ordered from the size number alone?
No. The 50 family still contains different ratio/start/lead conditions. Send the ratio and current shaft or wheel data so the tooth relationship can be confirmed.
What if the JDLB 50 wheel is also worn?
Quote the size-50 worm and wheel together when wear or contact condition makes the original mesh uncertain. Pair-level review avoids treating a damaged mating member as a valid reference.
Replacement / service
Use JDLB 50 as a drive-family reference, then confirm the actual shaft
The JDLB 50 page carries documented series context for a dual-lead worm drive, including size-specific envelope, adjustment and selected drive-performance references already shown above. Those figures describe the drive family; they do not define every bearing journal, end feature or replacement shaft dimension.
For JDLB 50 service work, tie the replacement request to the actual reducer identity and mating wheel, then compare the current adjustment condition with the reason the part is being replaced. Shaft dimensions should come from the controlled drawing, sample or trusted measurements.
JDLB 50 order-release checklist
| Release item | Information to supply |
|---|---|
| Drive identity | JDLB 50 size reference plus ratio / model information. |
| Existing shaft | Drawing, sample, or trusted dimensions for journals, shoulders and input/end interfaces. |
| Mating wheel | Current wheel condition and identifying data; include it when tooth geometry or contact is uncertain. |
| Adjustment state | Current axial adjustment/reference position and the reason for replacement or backlash correction. |
| Duty | Input speed, load/torque context, reversals and lubrication condition. |
| Inspection | State whether the order needs dimensional records, material/treatment evidence or pair/assembly checks. |
Where the JDLB 50 shaft sits in a multi-unit drive context
When several size-50 stations are connected by a common shaft line, include the complete station order and coupling interfaces. Quoting one isolated component without that layout can hide an axial-location or alignment constraint.
Quote from the real interfaces
Request a Quote / Send RFQ
Send the model or drawing reference, quantity, application and the geometry that controls fit and mesh. Unknown values can be identified for confirmation rather than guessed.
