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What are the concerns of helical gear?

Herringbone gear

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Helical gears have several concerns. One concern is the appearance of edge contact, which can lead to defects in the gear drive . Another concern is the high levels of vibration that can occur in misaligned gear drives . Additionally, the shift of the bearing contact far from the central location is a concern in misaligned gear drives . To address these concerns, various corrections to gear geometry have been applied, such as correcting the lead angle of the pinion and crowning the areas of the tip of the profile and the edge of the teeth . Another concern is the backlash between helical gears, which can affect the smooth transmission of rotary motion . The radial clearance between the gears in their reference meshing state is smaller than the radial gap of the backlash, which can cause issues .

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Patent Helical planetary gear pump Zhang Zhihong, Liu Zhongming, Wang Zhengbing, Yan Shitang - Show less +3 more 06 Aug 2014 1 Citations	The paper does not mention any concerns specifically related to helical gears. The paper discusses the advantages of a helical planetary gear pump, such as canceling out radial forces, reducing stress and abrasion, and increasing the service life and displacement of the gear pump.
Patent Helical gear grinding machine Su Jianxin, Li Chen, Guo Hao, Cheng Chen - Show less +3 more 11 Dec 2020	The provided paper does not mention any concerns of helical gears. The paper is about a helical gear grinding machine and its components.
Patent Helical gear with gap eliminating device Gao Zhijian 02 Feb 2018 2 Citations	The paper does not mention any specific concerns of helical gears. The paper is about a helical gear with a gap eliminating device.
Book Chapter•DOI Gear Geometry and Applied Theory: Involute Helical Gears with Crossed Axes Faydor L. Litvin, Alfonso Fuentes - Show less +1 more 01 Sep 2004 1 Citations	The concerns of helical gears include the appearance of edge contact, high levels of vibration, and the shift of the bearing contact far from the central location.
Patent Helical gear device Yorita Hiroshi, Taketsugu Sasaki, Tsukamoto Kenichiro, Arakawa Kazuya, Hashimoto Manabu - Show less +4 more 04 Jun 2018	The paper does not mention any specific concerns of helical gears.

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How helical coil effect the heat transfer coefficient in two phase flow boiling.?5 answersHelical coils significantly impact the heat transfer coefficient in two-phase flow boiling. The coil diameter plays a crucial role in affecting pressure drop and non-uniform circumferential heat transfer, with smaller coil diameters showing more pronounced effects on heat transfer enhancement. Geometric parameters like coil diameter and pitch, along with operating conditions such as mass flux and vapor quality, influence heat transfer characteristics during condensation and boiling in helical coils. Additionally, the Nusselt number decreases with increasing heat flux during condensation due to the turbulence effect created by secondary flow in helically coiled tubes, which eliminates density-related effects. Numerical analyses of helical coil heat exchangers further explore the impact of D/d ratios on heat transfer rates and pumping power, providing insights into optimal heat transfer conditions for different boundary conditions.

What is the effect of using shell and dimpled helical pipe on fluid flow in industrial applications?5 answersThe use of shell and dimpled helical pipes in industrial applications has been found to have a positive effect on fluid flow. The incorporation of dimples on the tubes of shell-and-tube heat exchangers has been shown to enhance heat transfer and fluid flow characteristics, resulting in a higher overall heat transfer coefficient compared to conventional smooth tubes. Additionally, the use of helical grooves on tube bundles has been found to decrease the hydraulic losses and reduce the hydraulic resistance, resulting in a lower pressure drop. These improvements in fluid flow can lead to increased efficiency and performance of heat exchangers in industrial settings.

What are the proportion for helical gears?5 answersHelical gears have different proportions depending on the specific application. In the context of miniature helical gears, the specifications include a module of 0.3, a number of teeth of 12, and a helix angle of 15°. In the context of high-speed and heavily loaded gearing, the components are designed for high power-to-weight ratios and are fabricated as light as possible. The specific proportions for these gears are not mentioned in the abstract. In the context of direct gear design for spur and helical involute gears, nonstandard gears with custom proportions, such as pressure angle, addendum, and whole depth, are used to achieve the best possible performance for a particular product and application.

What is the history of helical gear?5 answersHelical gears have been used in various applications throughout history. They have been used in power takeoff assemblies for mechanical transmissions, such as loader gearboxes and other engineering machine tools. Injection molding processes have been utilized to create helical gears, with the mold cavity made of mirror-finished hardened stainless steel. The durability of forging dies and form rolling tools has been improved by forming columnar stocks into cylindrical shapes, executing intermediate annealing, forging preliminary helical gears, cutting the end parts, and finishing them to desired helical gear forms through tooth form rolling. Helical gear sets have also been designed for transmissions that can transmit large amounts of power in limited spaces, with stub shafts extending laterally from the gear elements and a coupler to join the gear elements in driving contact. Overall, helical gears have a rich history of being used in various industries and applications.

What is the history of spur gear to helical gear?5 answersSpur gears and helical gears are two types of gear drives used for power and motion transmission between rotating shafts. Spur gears are the simplest and most common type of parallel-shaft gear drives, while helical gears are also popular in this category. The design of gearings typically involves complex diagrams and trial and error, but there are methods proposed in the literature that provide good approximations and easy calculations for gear design. The dynamic characteristics of spur gears and helical gears, including vibration and noise, have been studied using finite element models and analytical models. It has been observed that helical gears have lower natural frequencies compared to spur gears. Additionally, a gear mechanism has been proposed that combines spur gears with helical toothing, where the first spur gear has elevations beyond the tip circle diameter.

How does helical gear help with technology?5 answersHelical gears help with technology by reducing vibration and noise, improving stability, minimizing failures, and optimizing design. They achieve this through gear modification techniques, stress analysis, and changeable helical angles. Gear modification reduces vibration and noise, improving the stability of gear transmission systems. Stress analysis allows for monitoring and estimation of bending and contact stresses on gear teeth, helping to minimize failures and optimize gear design. Changeable helical angles in helical gears result in increased contact surface area, reduced tooth surface contact stress, improved gear contact fatigue strength, prolonged service life, stable gear transmission, reduced noise, and improved overall performance of the bearing system. Helical gears made of composite materials, such as metal matrix composites, provide better performance and increased gear lifetime compared to traditional helical gears.

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