Product Description
Product Description
>Introduction
ZLYJ series Reduction Gearbox (speed reducer) is a transmission part for most single screw extrusion line, wihch also possesses high precision hard gear surface and thrust block designed. Designed with standard ZBJ19009-88, it combines well with most of machines from different suppliers. Also the gear and axis parts are made of high strength alloy steel with surface hardness HRC54~62. In the front end of hollow input axis there is large specification thrust bearing that will bear axial thrust force while the screw is working
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>Applied Circumstance
1. All kind of extrusion & blowing machinery
2. High speed shaft rotation Speed <1500RPM
3. Working Environment Temp. -40~45°C, with temperature below 0°C, should pre-heat lubrication oil to above 0°C
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>Major Technical Index
1. Output Speed: 16-100 RPM
2. Output Torque: Max.4300 Nm
3. Motor Power: 5.5-200 Kw
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>Selection of Gearbox
1. Select speed ratio
e.g. input speed n1=1000rpm, output speed n2=70rpm, ratio i=n1/n2=14.28, should select ratio 14
2. Select model type according to input power
e.g. input power P=26kw, after checking form, 29kw>26kw, most ecomonic should be ZLYJ200
3. Select assemble type
as per actual use, select horizontal or vertical type
4. Calculate axial thrust Fa=π*Ds²*Ps/(4*1000)
e.g. Screw diameter Ds=75mm, Screw pressure Ps=26MPa
Fa=π*Ds²*Ps/(4*1000)=114.8kN
187kN>114.8kN, ZLYJ200 can bear the axial thrust and economic to select
5. Confirm connection size
6. Confirm cooling type
Parameters Concerned
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| Standard: | DIN, GB, JIS |
|---|---|
| Technics: | Forging |
| Feature: | Recycle |
| Material: | Metal |
| Gearing Arrangement: | Helical |
| Input Speed: | 600-1500rpm |
| Samples: |
US$ 2000/Set
1 Set(Min.Order) | |
|---|
| Customization: |
Available
| Customized Request |
|---|
Types of Helical Gear Arrangements
Yes, there are different types of helical gear arrangements available to suit various applications and requirements. Some of the common helical gear arrangements include:
Parallel Shaft Arrangement: In this arrangement, the axes of the driving and driven shafts are parallel to each other. It is the most straightforward configuration and is often used in applications where space is not a constraint, and the gearboxes can be placed side by side.
Right-Angle Shaft Arrangement: In a right-angle arrangement, the driving and driven shafts are positioned at a 90-degree angle to each other. This arrangement is space-saving and is commonly used in applications where the layout requires a change in direction of the power transmission.
Double Helical Gear Arrangement (Herringbone Gears): Double helical gears consist of two sets of helical teeth facing each other. This arrangement helps to cancel out axial forces and reduces the net thrust load on bearings. It is often used in heavy-duty applications to minimize wear and vibration.
Crossed Helical Gear Arrangement (Screw Gears): In this configuration, the axes of the driving and driven shafts are neither parallel nor intersecting. It is suitable for applications requiring non-parallel and non-intersecting shafts.
The choice of helical gear arrangement depends on factors such as available space, power transmission requirements, and the desired layout of the machinery or equipment. Each arrangement has its advantages and disadvantages, and selecting the appropriate one is crucial for achieving optimal performance and efficiency.
Relationship Between Helix Angle and Load Capacity in Helical Gears
The helix angle of helical gears plays a significant role in determining their load-carrying capacity and overall performance. Here’s the relationship between the helix angle and load capacity:
1. Load Distribution: The helix angle affects how the load is distributed along the gear teeth. A larger helix angle results in a more gradual tooth engagement, allowing for smoother load sharing across multiple teeth. This improves the gear’s ability to handle higher loads.
2. Contact Ratio: The contact ratio, which indicates the number of teeth in contact at any given time, increases with a larger helix angle. A higher contact ratio helps distribute the load over a larger area of the gear teeth, enhancing load-carrying capacity.
3. Tooth Meshing: The helix angle affects how the teeth mesh with each other. A higher helix angle promotes gradual and smoother meshing, reducing the concentration of stress on individual teeth. This results in improved resistance to wear and fatigue.
4. Axial Thrust: Helical gears produce axial thrust due to their helical nature. This thrust can affect the gear’s ability to handle radial loads. Proper consideration of the helix angle can help manage axial thrust and prevent overloading.
5. Lubrication: The helix angle affects the lubrication conditions between gear teeth. A larger helix angle may allow better oil flow and lubrication, reducing friction and wear, thereby enhancing load capacity.
6. Noise and Vibration: The helix angle also influences noise and vibration levels in helical gears. Optimal helix angle selection can minimize noise and vibration, contributing to smoother operation and prolonged gear life.
Optimal Helix Angle Selection: While a larger helix angle generally increases load capacity, it’s important to strike a balance. Extremely large helix angles can lead to reduced tooth strength and efficiency. Engineers consider factors like application requirements, tooth strength, and noise considerations when selecting the optimal helix angle for a specific gear design.
The relationship between the helix angle and load capacity underscores the importance of proper gear design to ensure optimal performance, durability, and reliability in various applications.
Handling High Torque and Heavy Loads in Helical Gearboxes
Helical gearboxes are well-suited for handling high torque and heavy loads due to their unique design and meshing characteristics:
- Helical Teeth: The helical shape of the gear teeth allows for gradual and continuous contact between the teeth during meshing. This results in smoother load distribution and reduced impact forces, making helical gears capable of handling heavy loads.
- Multiple Tooth Contact: Helical gears have multiple teeth in contact at any given time, spreading the load over a larger area of gear teeth. This helps to distribute the load evenly and prevent localized wear and stress concentrations.
- Increased Tooth Strength: The inclined orientation of helical gear teeth increases the tooth width, leading to greater tooth strength and improved load-carrying capacity.
- Bearings and Shaft Design: The gearbox housing is designed to support heavy loads and provide proper alignment for the shafts and bearings. High-quality bearings and shafts help distribute the load and reduce wear.
- Lubrication: Adequate lubrication is crucial to minimize friction and heat generation between gear teeth. Proper lubrication also helps to dissipate heat generated by the heavy loads.
- Material Selection: High-strength materials with good wear resistance properties are chosen for helical gears to ensure they can withstand the demands of heavy loads.
Overall, the gradual engagement of helical gear teeth and their ability to handle multiple tooth contact positions them as a reliable choice for applications that require high torque and can handle heavy loads. Engineers carefully design helical gearboxes to ensure they can withstand the stresses imposed by the application’s specific requirements.
editor by CX 2024-03-28