Product Description
Product Description
Application
Marine Gearbox D300A is suitable for fishing, tug, engineering and transport boats.
Description
Marine Gearbox D300A possesses functions of speed reduction, ahead and astern clutching and bearing propeller thrust. It is designed of vertically offset and one-stage transmission, featuring in small in volume, large in ratio, light in weight and easy in dismantle & reassemble and maintain.
ADVANCE D300A – 4:1
MEDIUM/HEAVY DUTY GEARBOX
| Reference number | A-D300A-4 |
| Brand | Advance |
| Model | D300A |
| Ratio | 4:1 |
| Power | 630 HP @ 1800 RPM |
| Max. Power | 805 HP @ 2300 RPM |
| RPM Range | 1000-2300 |
| Rated propeller thrust | 60 kn |
| N/n | 0,35 hp/rpm |
FEATURES & OPTIONS
| Sae housing | Without/sae-0/sae-1 |
| Controls | Mechanical/ electrical |
| Pto | Available |
| Note | If using flexible couping, rate will rise 8% |
| Coupling size | 18 /16 /14 inch |
| Coupling type | Rubber block drive, with alu. ring/(high) flexible coupling |
DIMENSIONS
| Vertical offset | 355 mm |
| LxWxH | 786x920x1040 mm |
| Net. weight | 940 kg |
AVAILABLE ARRANGEMENTS
| Ratio | 4,48:1 | 4:1 | 5,05:1 | 5,52:1 | 5,9:1 | 6,56:1 | 7,06:1 | 7,63:1 |
| Rate | 0,33 hp/rpm | 0,35 hp/rpm | 0,30 hp/rpm | 0,25 hp/rpm | 0,20 hp/rpm | 0,17 hp/rpm | ||
Main Data
|
Input speed |
1000-2500r/min |
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|
Reduction ratio |
4.00 |
Trans. capacity |
0.257kw/r/min |
|
4.48 |
0.243kw/r/min |
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5.05 |
0.221kw/r/min |
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5.52,5.90 |
0.184kw/r/min |
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|
6.56,7.06 |
0.147kw/r/min |
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7.63 |
0.125kw/r/min |
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Control way |
Push-and-pull flexible shaft, electrically, pneumatically |
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Rated thrust |
60KN |
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|
Center distance |
355mm |
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|
L×W×H |
786×980×1041mm |
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|
Net weight |
940kg |
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Flywheel |
12V135,SAE18,16,14 |
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|
CHINAMFG housing |
12V135,SAE0,1 |
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Our Service
Pre-Sales Service
* Inquiry and consulting support.
* Sample testing support.
* View our Factory.
After-Sales Service
* Training how to instal the machine, training how to use the machine.
* Engineers available to service machinery overseas.
Our Company
We can provide:
WEICHAI
Sales of Chinese marine engines and gearboxes, generator sets, pump units, providing modification, upgrades, consulting services
Products China marine engine parts and engineering machinery parts. Products include: CHINAMFG HOWO, CHINAMFG Power, SHXIHU (WEST LAKE) DIS.I, service
Provide cargo warehousing, packaging, transportation and export agency services
Agency procurement, inspection and inspection agency
HangZhou CHINAMFG power Co., Ltd
Contaction Person: ceci lee
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| Application: | Motor, Marine |
|---|---|
| Function: | Change Drive Direction, Speed Changing, Speed Reduction, Speed Increase |
| Hardness: | Hardened Tooth Surface |
| Installation: | Horizontal Type |
| Step: | Single-Step |
| Type: | Worm Gear Box |
| Customization: |
Available
| Customized Request |
|---|
Self-Locking Properties in a Worm Gearbox
Yes, worm gearboxes exhibit self-locking properties, which can be advantageous in certain applications. Self-locking refers to the ability of a mechanism to prevent the transmission of motion from the output shaft back to the input shaft when the system is at rest. Worm gearboxes inherently possess self-locking properties due to the unique design of the worm gear and worm wheel.
The self-locking behavior arises from the angle of the helix on the worm shaft. In a properly designed worm gearbox, the helix angle of the worm is such that it creates a mechanical advantage that resists reverse motion. When the gearbox is not actively driven, the friction between the worm threads and the worm wheel teeth creates a locking effect.
This self-locking feature makes worm gearboxes particularly useful in applications where holding a load in position without external power is necessary. For instance, they are commonly used in situations where there’s a need to prevent a mechanism from backdriving, such as in conveyor systems, hoists, and jacks.
However, it’s important to note that while self-locking properties can be beneficial, they also introduce some challenges. The high friction between the worm gear and worm wheel during self-locking can lead to higher wear and heat generation. Additionally, the self-locking effect can reduce the efficiency of the gearbox when it’s actively transmitting motion.
When considering the use of a worm gearbox for a specific application, it’s crucial to carefully analyze the balance between self-locking capabilities and other performance factors to ensure optimal operation.
Worm Gearbox vs. Helical Gearbox: A Comparison
Worm gearboxes and helical gearboxes are two popular types of gear systems, each with its own set of advantages and disadvantages. Let’s compare them:
| Aspect | Worm Gearbox | Helical Gearbox |
| Efficiency | Lower efficiency due to sliding friction between the worm and worm wheel. | Higher efficiency due to rolling contact between helical gear teeth. |
| Torque Transmission | Excellent torque transmission and high reduction ratios achievable in a single stage. | Good torque transmission, but may require multiple stages for high reduction ratios. |
| Noise and Vibration | Generally higher noise and vibration levels due to sliding action. | Lower noise and vibration levels due to smoother rolling contact. |
| Backlash | Higher inherent backlash due to the design. | Lower backlash due to meshing of helical teeth. |
| Efficiency at Higher Speeds | Less suitable for high-speed applications due to efficiency loss. | More suitable for high-speed applications due to higher efficiency. |
| Overload Protection | Natural self-locking feature provides some overload protection. | May not have the same level of inherent overload protection. |
| Applications | Commonly used for applications requiring high reduction ratios, such as conveyor systems and heavy-duty machinery. | Widely used in various applications including automotive transmissions, industrial machinery, and more. |
Both worm and helical gearboxes have their place in engineering, and the choice between them depends on the specific requirements of the application. Worm gearboxes are preferred for applications with high reduction ratios, while helical gearboxes are chosen for their higher efficiency and smoother operation.
How Does a Worm Gearbox Compare to Other Types of Gearboxes?
Worm gearboxes offer unique advantages and characteristics that set them apart from other types of gearboxes. Here’s a comparison between worm gearboxes and some other common types:
- Helical Gearbox: Worm gearboxes have higher torque multiplication, making them suitable for heavy-load applications, while helical gearboxes are more efficient and offer smoother operation.
- Bevel Gearbox: Worm gearboxes are compact and can transmit motion at right angles, similar to bevel gearboxes, but worm gearboxes have self-locking capabilities.
- Planetary Gearbox: Worm gearboxes provide high torque output and are cost-effective for applications with high reduction ratios, whereas planetary gearboxes offer higher efficiency and can handle higher input speeds.
- Spur Gearbox: Worm gearboxes have better shock load resistance due to their sliding motion, while spur gearboxes are more efficient and suitable for lower torque applications.
- Cycloidal Gearbox: Cycloidal gearboxes have high shock load capacity and compact design, but worm gearboxes are more cost-effective and can handle higher reduction ratios.
While worm gearboxes have advantages such as high torque output, compact design, and self-locking capability, the choice between gearbox types depends on the specific requirements of the application, including torque, efficiency, speed, and space limitations.
editor by CX 2024-03-15
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