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Help CenterSnake Spring Coupling | High Torque Flexible Shaft Coupling Manufacturer
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Snake Spring Coupling – Detailed Description (Serpentine / Grid Coupling)
1. Product Features & Working Principle
1.1 Structure and Working Principle
The snake spring coupling belongs to the category of flexible couplings. It transmits power and compensates for misalignment through the elastic deformation of a serpentine spring steel grid. Its structure consists of hubs (half-coupling halves), the grid element, and a housing with seals. The hubs are used in pairs, made of high-strength steel with curved tooth grooves, and connect to the shafts. The serpentine spring is the core elastic element, embedded in the curved tooth grooves to transmit torque while sliding within the grooves to adaptively compensate for misalignment. The housing and seals are typically made of aluminum alloy or stainless steel to prevent grease leakage and contaminant ingress; some designs store grease inside the housing wall for noise reduction.
The contact between the spring and the tooth groove surface is point contact, giving the coupling greater flexibility and allowing it to accommodate radial, angular, and axial misalignment simultaneously without affecting power transmission.
1.2 Core Performance Parameters
Parameter |
Value / Description |
Remarks |
|---|---|---|
Vibration damping rate |
Up to 36% |
Spring absorbs shock and vibration |
Transmission efficiency |
99.47% |
Near rigid transmission |
Short-term overload |
2–3 times rated torque |
Reliable operation |
Operating temperature |
–30 ~ +150 °C (heavy/mining standard); Our page: –30 ~ +120 °C, special material ≥250 °C |
High temperature requires customized spring steel heat treatment |
Maximum speed |
Small/medium range ≤ 10,000 rpm; JS heavy/mining range 1,500–5,000 rpm |
|
Torque range |
Our page: 5–500 Nm (customizable up to 2,000 Nm); JS national standard series: 160–160,000 N·m |
1.3 Common Structural Types (Domestic JS Series System)
Note: Your current page focuses on small/medium torque general-purpose models with customization options. The JS heavy/mining series below is provided as an “extended selection for high torque” reference, so you have answers ready when customers ask.
Type |
Code |
Feature |
|---|---|---|
Basic type |
JS |
No brake wheel, most universal |
Axial mounting housing |
JSB |
Housing assembled/disassembled axially |
With brake wheel |
JSZ / JSS |
Cranes, hoists |
With brake disc |
JSP |
Space-limited braking applications |
High-speed type |
JSG |
High rotational speed conditions |
With intermediate shaft |
SJS |
Larger span transmissions |
2. Application Scenarios
Grouped by industry and equipment for easy buyer reference:
Heavy Industry Key Equipment
Mining: Crushers (jaw/cone), ball mills, vibrating screens. In these applications, the snake spring coupling resists strong impact and vibration, extending equipment life.
Metallurgy: Rolling mills, continuous casting machines, hot rolling straighteners. Requires high temperature resistance (+350 °C special material) and ability to handle instantaneous high torque.
Cement production lines: Long-term continuous heavy-load transmission.
Heavy Material Handling & Construction Machinery
Large belt conveyors: Suitable for dusty, high-humidity environments with corrosion-resistant operation.
Crane winches / hoists: Smooth torque transmission; JSS/JSZ types with brake wheels are suitable.
Excavator swing mechanisms: Compensate for dynamic misalignment between hydraulic motor and turntable.
General Industrial Equipment (Your Page’s Main Focus)
Pumps / fans: Reduce starting/stopping shock on shafting, suitable for stable torque conditions.
Gearboxes / reducers: Compensate for installation misalignment, protect bearings.
Compressors, mixers, conveyors.
Servo drives / production lines: Select zero-backlash version with low inertia.
Selection Tip: For stable torque conditions, choose straight-tooth type (JS basic type). For impact load conditions, choose curved-tooth type (optimized load capacity + vibration damping). For heavy duty, prioritize hydraulic expansion sleeve mounting.
3. Purchasing Process (How to Order)
Follow the actual B2B factory-direct path. Buyers can fill in the required information to avoid back-and-forth communication.
Step 1 – Inquiry
Contact the factory/sales and provide the following mandatory technical parameters (missing any one may lead to wrong model selection):
Inquiry Checklist
-
Motor power (kW) + speed (rpm)
-
Shaft diameters on both ends (drive side / driven side – may differ; select based on larger diameter)
-
Installation space constraints (overall length / outer diameter allowance)
-
Misalignment conditions: approximate radial / angular / axial values
-
Operating conditions: continuous or intermittent? Any impact? Ambient temperature? Corrosive environment? (determines spring steel or stainless steel 304/316)
-
Quantity required (affects unit price and delivery time)
The factory can calculate torque and recommend a model based on “power + speed + shaft diameter.” Your page FAQ already promises this – include it in the process.
Step 2 – Model Selection / Drawing
Standard models: Simply provide model number + bore diameter (e.g., SSC-42, drive end Ø30, driven end Ø35).
Non-standard / custom: Provide shaft layout drawing or dimensional sketch; factory provides solution + quotation within 1–2 working days.
Confirmation: Material (spring steel / SS304/316), surface treatment (zinc plating / black oxide / nickel), bore type (keyway / clamp hub).
Step 3 – Sample (Optional)
Sample orders supported; delivery in 7–10 days.
For large first-time orders, sample cost deduction may be negotiable.
Step 4 – Order Confirmation
MOQ: 10 pcs (as stated on your page).
Payment: T/T 30% deposit + 70% against copy of bill of lading (standard international trade terms).
Delivery time: Standard models 15–20 days, custom models 25–35 days; faster if stock available.
Step 5 – Production & Quality Inspection
ISO 9001 process control.
Static balancing (for high-speed models), torque spot check, full dimensional inspection before shipment.
Step 6 – Shipment
Port of loading: Tianjin (also Shanghai or Qingdao available).
Packaging: Wooden case / carton / pallet, standard export packing.
Documents provided: Packing list, commercial invoice, material certificate, certificate of conformity.
Step 7 – After-Sales Service
Installation guidance (video / drawings).
The spring is a wear part; normal service life is long but may shorten under overload or excessive misalignment. After-sales support allows separate purchase of spring strips without replacing the entire coupling – this is a key advantage of the snake spring coupling and should be highlighted in the process.
Send Inquiry to This Supplier
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