Product Description
LYMC Factory Wholesales CNC Machine Helical Tooth Rack Gear And Pinion Gear In Fast Shipping
There are many types of gears such as spur gears, helical gears, bevel gears, worm gears, gear rack, etc. These can be broadly classified by looking at the positions of axes such as parallel shafts, intersecting shafts and non-intersecting shafts.
It is necessary to accurately understand the differences among gear types to accomplish necessary force transmission in mechanical designs. Even after choosing the general type, it is important to consider factors such as: dimensions (module, number of teeth, helix angle, face width, etc.), standard of precision grade (ISO, AGMA, DIN), need for teeth grinding and/or heat treating, allowable torque and efficiency, etc.
Spur Gear
Gears having cylindrical pitch surfaces are called cylindrical gears. Spur gears belong to the parallel shaft gear group and are cylindrical gears with a tooth line which is straight and parallel to the shaft. Spur gears are the most widely used gears that can achieve high accuracy with relatively easy production processes. They have the characteristic of having no load in the axial direction (thrust load). The larger of the meshing pair is called the gear and smaller is called the pinion.
Helical Gear
Helical gears are used with parallel shafts similar to spur gears and are cylindrical gears with winding tooth lines. They have better teeth meshing than spur gears and have superior quietness and can transmit higher loads, making them suitable for high speed applications. When using helical gears, they create thrust force in the axial direction, necessitating the use of thrust bearings. Helical gears come with right hand and left hand twist requiring opposite hand gears for a meshing pair.
Gear Rack
Same sized and shaped teeth cut at equal distances along a flat surface or a straight rod is called a gear rack. A gear rack is a cylindrical gear with the radius of the pitch cylinder being infinite. By meshing with a cylindrical gear pinion, it converts rotational motion into linear motion. Gear racks can be broadly divided into straight tooth racks and helical tooth racks, but both have straight tooth lines. By machining the ends of gear racks, it is possible to connect gear racks end to end.
Bevel Gear
Bevel gears have a cone shaped appearance and are used to transmit force between 2 shafts which intersect at 1 point (intersecting shafts). A bevel gear has a cone as its pitch surface and its teeth are cut along the cone. Kinds of bevel gears include straight bevel gears, helical bevel gears, spiral bevel gears, miter gears, angular bevel gears, CHINAMFG gears, zerol bevel gears and hypoid gears.
Screw Gear
Screw gears are a pair of same hand helical gears with the twist angle of 45° on non-parallel, non-intersecting shafts. Because the tooth contact is a point, their load carrying capacity is low and they are not suitable for large power transmission. Since power is transmitted by the sliding of the tooth surfaces, it is necessary to pay attention to lubrication when using screw gears.
Worm Gear
A screw shape cut on a shaft is the worm, the mating gear is the worm wheel, and together on non-intersecting shafts is called a worm gear. Worms and worm wheels are not limited to cylindrical shapes. There is the hour-glass type which can increase the contact ratio, but production becomes more difficult. Due to the sliding contact of the gear surfaces, it is necessary to reduce friction. For this reason, generally a hard material is used for the worm, and a soft material is used for worm wheel. Even though the efficiency is low due to the sliding contact, the rotation is smooth and quiet. When the lead angle of the worm is small, it creates a self-locking feature.
Internal gear
Internal gears have teeth cut on the inside of cylinders or cones and are paired with external gears. The main use of internal gears are for planetary gear drives and gear type shaft couplings. There are limitations in the number of teeth differences between internal and external gears due to involute interference, trochoid interference and trimming problems. The rotational directions of the internal and external gears in mesh are the same while they are opposite when 2 external gears are in mesh.
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Product name |
Spur Gear & Helical Gear & Gear Shaft |
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Materials Available |
Stainless Steel, Carbon Steel, Brass, Bronze, Iron, Aluminum Alloy etc |
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Heat Treatment |
Quenching & Tempering, Carburizing & Quenching, High-frequency Hardening, Carbonitriding…… |
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Surface Treatment |
Carburizing and Quenching,Tempering ,Tooth suface high quenching Hardening,Tempering |
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BORE |
Finished bore, Pilot Bore, Special request |
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Processing Method |
Molding, Shaving, Hobbing, Drilling, Tapping, Reaming, Manual Chamfering, Grinding etc |
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Pressure Angle |
20 Degree |
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Hardness |
55- 60HRC |
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Size |
Customer Drawings & ISO standard |
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Package |
Wooden Case/Container and pallet, or made-to-order |
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Certificate |
ISO9001:2008 |
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Machining Process |
Gear Hobbing, Gear Milling, Gear Shaping, Gear Broaching, Gear Shaving, Gear Grinding and Gear Lapping |
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Applications |
Toy, Automotive, instrument, electrical equipment, household appliances, furniture, mechanical equipment,daily living equipment, |
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Advantages |
1. Produce strictly in accordance with ANSI or DIN standard dimension |
Product Process
Application:
About Us:
HangZhou MC Bearing Technology Co.,Ltd (LYMC),who is manufacture located in bearing zone, focus on Slewing bearing, cross roller bearing and pinion,Dia from 50mm-8000mm, Our team with technical and full experience in the bearing industry.
*Professional in researching, developing, producing & marketing high precision bearings for 16 years;
*Many series bearings are on stock; Factory directly provide, most competitive price;
*Advanced CNC equipment, guarantee product accuracy & stability;
*One stop purchasing, product include cross roller bearing, rotary table bearing, robotic bearing, slewing bearing, angular contact ball bearing, large and extra large custom made bearing, diameter from 50~9000mm;
*Excellent pre-sale & after sale service. We can go to customers’ project site if needed.
*Professional technical & exporting team ensure excellent product design, quotation, delivering, documentation & custom clearance.
Our Service:
FAQ:
1.Q: Are you trading company or manufacturer ?
A: We are professional slewing bearing manufacturer with 20 years’ experience.
2.Q: How long is your delivery time?
A: Generally it is 4-5 days if the goods are in stock. or it is 45 days if the goods are not in
stock, Also it is according to quantity.
3.Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample, it is extra.
4.Q: What is your terms of payment ?
A: Payment=1000USD, 30% T/T in advance, balance before shipment.
5.Q: Can you provide special customization according to the working conditions?
A: Sure, we can design and produce the slewing bearings for different working conditions.
6.Q: How about your guarantee?
A: We provide lifelong after-sales technical service.
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| Application: | Motor, Machinery, Marine, Agricultural Machinery, Mining, Petroleum, Automatic,Excavator,Crane, |
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| Hardness: | Hardened Tooth Surface |
| Gear Position: | External Gear |
| Toothed Portion Shape: | Helical Bevel Gear |
| Material: | Stainless Steel |
| Type: | Non-Circular Gear |
| Customization: |
Available
| Customized Request |
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What are the advantages and disadvantages of using helical gears?
Helical gears offer several advantages and disadvantages compared to other types of gears. It’s important to consider these factors when selecting the appropriate gear type for a specific application. Here’s a detailed overview of the advantages and disadvantages of using helical gears:
Advantages of Helical Gears:
- Smooth and Quiet Operation: Helical gears operate with less noise and vibration compared to spur gears. The inclined tooth profile allows for gradual tooth engagement, resulting in smooth and quiet gear meshing. This advantage makes helical gears suitable for applications that require low noise levels and improved operator comfort.
- High Load-Carrying Capacity: The inclined teeth of helical gears provide a larger contact area compared to other gear types. This increased contact area enables helical gears to handle higher loads and transmit greater torque without excessive wear or risk of tooth failure. Helical gears are known for their high load-carrying capacity, making them suitable for heavy-duty applications.
- Efficient Power Transmission: Helical gears offer efficient power transmission due to their inclined tooth design. The gradual engagement of helical teeth reduces impact and shock loads, minimizing energy losses and improving overall system efficiency. This advantage makes helical gears suitable for applications where power efficiency is critical.
- Higher Gear Ratios: Helical gears can achieve higher gear ratios compared to other gear types. This capability allows for more precise speed control and torque conversion in various applications. Helical gears are ideal for systems that require fine-tuning of rotational speed and torque output.
- Compact Design: Helical gears have a compact design that allows for efficient use of space within a system. The inclined tooth profile enables multiple gear sets to be positioned on parallel or intersecting shafts, facilitating compact gear arrangements. This advantage is particularly useful in applications with space constraints.
- Good Meshing Characteristics: Helical gears exhibit excellent meshing characteristics, including smooth gear engagement and minimal backlash. The inclined tooth profile ensures precise gear meshing, resulting in accurate motion control and reduced vibration. This advantage is desirable in applications that require precise positioning and synchronization of components.
Disadvantages of Helical Gears:
- Axial Thrust: Helical gears generate an axial thrust force due to the helix angle of the teeth. This axial thrust must be properly supported to prevent axial movement of the gear shafts. Additional thrust bearings or thrust plates may be required, adding complexity and cost to the gear system design.
- Complex Manufacturing: The manufacturing process of helical gears is more complex compared to spur gears. The inclined tooth profile requires specialized cutting tools and machinery to produce accurate helical gears. This complexity can result in higher manufacturing costs and longer lead times for custom gears.
- Efficiency Reduction at High Speeds: Helical gears may experience a reduction in efficiency at high rotational speeds. This reduction is due to an increase in axial thrust forces, which generate additional friction and energy losses. Proper lubrication and design considerations are necessary to mitigate this efficiency reduction.
- Thrust Load Sensitivity: Helical gears are sensitive to axial thrust loads. Uneven distribution of axial loads or improper alignment of gears can lead to increased wear and premature failure. Careful consideration of gear design, proper alignment, and adequate thrust load support are essential to ensure gear longevity and reliable operation.
- Limited Ratios: Although helical gears can achieve higher gear ratios compared to spur gears, their range of available gear ratios is limited compared to other gear types, such as worm gears or bevel gears. If a very high or very low gear ratio is required for a specific application, other gear types may be more suitable.
Considering these advantages and disadvantages, engineers can make informed decisions when selecting helical gears for their specific applications. By carefully evaluating the requirements and constraints of the system, they can leverage the strengths of helical gears while mitigating any potential limitations.
Can helical gears be used in heavy-duty machinery and equipment?
Yes, helical gears can be used in heavy-duty machinery and equipment. The design characteristics of helical gears make them well-suited for demanding applications that involve high loads, high speeds, and continuous operation. Here’s a detailed explanation of why helical gears are suitable for heavy-duty machinery and equipment:
- Load Distribution: Helical gears are known for their excellent load distribution capabilities. The inclined tooth profile of helical gears allows for multiple tooth contact, which helps distribute the load over a larger surface area. This feature enables helical gears to handle high loads encountered in heavy-duty applications, preventing concentrated stresses on individual teeth and promoting reliable power transmission.
- Smooth Operation: Helical gears operate with a rolling contact between the teeth, resulting in smoother and quieter operation compared to other gear types. The gradual engagement and disengagement of helical gears reduce impact forces and minimize vibrations. This smooth operation is advantageous for heavy-duty machinery and equipment, as it helps reduce wear, noise, and stress on the gear components.
- High Efficiency: Helical gears exhibit high efficiency due to their rolling contact and continuous tooth engagement. The inclined tooth profile allows for larger contact ratios, resulting in efficient power transmission with minimal energy losses. This characteristic is beneficial for heavy-duty machinery and equipment, as it helps optimize overall system efficiency and minimize energy consumption.
- Wide Range of Sizes and Ratios: Helical gears are available in a wide range of sizes and ratios, making them versatile for various heavy-duty applications. Whether it’s large-scale industrial machinery or heavy construction equipment, helical gears can be designed and manufactured to meet specific size and ratio requirements. This flexibility allows engineers to tailor the gear system to the demands of the heavy-duty application.
- Compatibility with High Speeds: Helical gears can effectively handle high rotational speeds, making them suitable for heavy-duty machinery and equipment that operate at high speeds. The helical gear design minimizes the risk of tooth-to-tooth impact and reduces the likelihood of gear tooth failures, such as pitting or chipping, even at elevated speeds. This compatibility with high speeds ensures reliable performance in heavy-duty applications that demand rapid operation.
- Ability to Handle Shock Loads: Heavy-duty machinery and equipment often experience shock loads during their operation. Helical gears are capable of withstanding moderate shock loads due to their robust construction and tooth engagement characteristics. However, if the application involves high shock loads, additional measures such as using hardened gears, optimizing gear materials, or incorporating shock-absorbing elements may be necessary.
- Compatibility with Lubrication Systems: Effective lubrication is vital for heavy-duty gear applications to minimize wear, reduce friction, and dissipate heat. Helical gears can be incorporated into lubrication systems that ensure proper oil flow and distribution. The inclined teeth of helical gears facilitate lubricant film formation and retention, helping to maintain optimal operating conditions and prolonging gear life in heavy-duty machinery and equipment.
- Manufacturing Expertise: The manufacturing processes for helical gears have been well-established and refined over many years. Gear manufacturers have extensive experience and expertise in producing helical gears, including large-scale and heavy-duty versions. This expertise ensures the production of high-quality helical gears that can meet the demands of heavy-duty machinery and equipment.
In summary, helical gears are well-suited for heavy-duty machinery and equipment due to their load distribution capabilities, smooth operation, high efficiency, adaptability to different sizes and ratios, compatibility with high speeds, ability to handle shock loads, compatibility with lubrication systems, and the manufacturing expertise available for their production. These factors make helical gears a reliable choice for heavy-duty applications across various industries.
Can you explain the concept of helical gear teeth and their orientation?
The concept of helical gear teeth and their orientation is essential to understanding the design and operation of helical gears. Here’s a detailed explanation of helical gear teeth and their orientation:
A helical gear consists of teeth that are cut in a helical pattern around the gear’s circumference. Unlike spur gears, which have teeth that are perpendicular to the gear axis, helical gears have teeth that are angled or inclined with respect to the gear axis. This inclination gives the teeth a helix shape, resulting in the name “helical” gears.
The orientation of helical gear teeth is defined by two main parameters:
- Helix Angle: The helix angle represents the angle formed between the tooth surface and an imaginary line perpendicular to the gear axis. It determines the degree of inclination or spiral of the gear teeth. The helix angle is typically measured in degrees. Positive helix angles indicate a right-hand helix, where the teeth slope in a right-hand direction when viewed from the gear’s end. Negative helix angles represent a left-hand helix, where the teeth slope in a left-hand direction. The helix angle affects the gear’s performance characteristics, including tooth engagement, load distribution, and axial thrust.
- Lead Angle: The lead angle is the angle formed by the helical tooth and a plane perpendicular to the gear axis. It represents the angle of advance of the helix over one revolution of the gear. The lead angle is equal to the helix angle divided by the gear’s number of teeth. It is commonly used to define the helical gear’s size and pitch.
The helical tooth orientation offers several advantages over spur gears:
- Smooth and Quiet Operation: The helical shape of the teeth allows for gradual engagement and disengagement during gear rotation. This results in smoother and quieter operation compared to spur gears, which often produce noise due to the sudden contact between teeth.
- Increased Load-Carrying Capacity: The helical tooth design provides a larger contact area between meshing gears compared to spur gears. This increased contact area allows helical gears to transmit higher loads and handle greater torque without excessive wear or tooth failure.
- Load Distribution: The helical orientation of the teeth enables load distribution along the tooth face. Multiple teeth are engaged simultaneously, distributing the load across a broader surface area. This characteristic helps minimize stress concentrations and increases the gear’s durability.
- Axial Thrust Load: The helical tooth engagement introduces axial forces and thrust loads along the gear axis. These forces must be properly supported and managed in the gear system design to ensure smooth operation and prevent excessive wear or failure.
The design and manufacturing of helical gears require specialized cutting tools and machining processes. The helical teeth are typically generated using gear hobbing or gear shaping methods. The tooth profile is carefully designed to ensure proper meshing and minimize noise, vibration, and wear.
In summary, helical gear teeth have a helical or spiral shape, which distinguishes them from the perpendicular teeth of spur gears. The orientation of helical gear teeth is defined by the helix angle and lead angle. Helical gears offer advantages such as smooth operation, increased load-carrying capacity, load distribution, and axial thrust load. These characteristics make helical gears suitable for applications that require efficient power transmission, precise motion control, and reduced noise and vibration.
editor by Dream 2024-05-08