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Pressure angle

About: Pressure angle is a research topic. Over the lifetime, 1373 publications have been published within this topic receiving 10245 citations. The topic is also known as: angle of obliquity.


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Journal ArticleDOI
TL;DR: In this paper , a numerical model for an asymmetric helical gear is developed through analytical equations, and the contact fatigue life (CFL) is estimated based on the Basquin and Coffin-Manson method.

2 citations

01 Jan 1998
TL;DR: In this paper, a gear fatigue test was performed and the dynamic characteristics were analyzed in a time-frequency domain using the wavelet transform, and the tooth surfaces were observed during the fatigue test.
Abstract: This paper deals with a diagnosis of the tooth surface failure by the wavelet transform. A gear fatigue test was performed and the dynamic characteristics were analysed in a time-frequency domain using the wavelet transform. The vibration acceleration of the gear box and the tooth root strain were measured and the tooth surfaces were observed during the fatigue test. The test gear had some tooth profile error due to the pressure angle before the fatigue test. At the initial stage of the fatigue test, this profile error closed to zero by moderate wear. Therefore, the wavelet intensity at each harmonic frequency of the tooth mesh frequency was considerably decreased at the initial stage of the fatigue test. A tooth surface of the gear was damaged by spalling failure with the progress of the fatigue test. The wavelet intensity at each harmonic frequency showed a high value when the spalled gear tooth meshed. It could be understood that a failed tooth can be diagnosed by this analysis when one tooth failed. However, in the case of adjoining plural failed teeth, it was difficult to diagnose each failed tooth.

2 citations

01 Jun 1952
TL;DR: In this paper, the effect of angle of attack on the meridional velocity profile of the laminar boundary layer on a cone is measured by the difference of total pressure recorded by two probes pointing toward the apex and located in the plane of symmetry of the flow.
Abstract: Note presenting a description of an instrument for the measurement of supersonic flow inclination, taking advantage of the effect of angle of attack on the meridional velocity profile of the laminar boundary layer on a cone. The effect of angle of attack may be measured by the difference of total pressure recorded by two probes pointing toward the apex and located in the plane of symmetry of the flow. Results of a single test are presented and discussed.

2 citations

Journal Article
TL;DR: In this paper, the authors present the possibilities of reduction in the root fillet stress of spur gear by introducing circular stress relieving feature of various sizes at different locations, which reduces the root tensile stress.
Abstract: This work presents the possibilities of percentage of reduction in the root fillet stress of spur gear by introducing circular stress relieving feature of various sizes at different locations. Two categories of systematic analyses are carried out using finite element model of spur gear. In the first category of analyses emphasize is given to determine the maximum root fillet stress which is required as reference to determine the stress reduction factor. In addition to this, the effect of number of teeth, pressure angle, and basic parameters of rack cutter on root fillet stress is investigated. In second category which is the prime focus of this work; the effect of introducing geometric stress relief feature is carried out. Circular stress relief feature of different size at strategic locations on a spur gear tooth are introduced. This reduces the root fillet stress. The magnitude of the load shared by a gear tooth depends on the position of the point of contact of teeth engagement along the line of action. It also depends on contact ratio. High contact ratio gear teeth pairs are subjected low load in comparison low contact ratio gear for transmitting same amount of torque. A tooth is released from the load as soon as it disengages with the mating gear tooth and it is taken by the next conjugate tooth. Therefore the gear teeth are subjected varying (fatigue) load. If a gear fails by bending fatigue, the failure is catastrophic and occurs with little or no warnings. The maximum root fillet tensile stress is one of the key factors which determine the fatigue life of the gear. Therefore the magnitude of the maximum value of the root fillet tensile stress can be treated as the index of fatigue life of gear. Even slight reduction in root fillet stress leads to a large increase in fatigue life of the gears designed for the stress level above endurance limit. This type of design consideration is very common, where safety and light weight are the principal design criteria. Therefore for all the reasons cited above, this work is of more practical importance. The program is coded in ANSYS Parametric Design Language (APDL). It automates the task of creation of model, meshing, applying boundary conditions, choosing the appropriate density of the mesh depending on the stress gradient. It also provides a means for defining the diameter and location of the circular stress relief features.

2 citations

Patent
12 Dec 2012
TL;DR: In this paper, a power output mechanical device for a tractor is presented, where the power output transmission shaft is connected with the low-gear driving gear and the high-gear driven gear through an involute spline.
Abstract: The utility model particularly relates to a power output mechanical device for a tractor. The power output mechanical device mainly comprises a power output transmission shaft, a low-gear driving gear, a high-gear driving gear, a high-gear driven gear, a low-gear driven gear, a power output intermediate shaft, a power output shaft and the like, wherein the power output transmission shaft is connected with the low-gear driving gear and the high-gear driving gear through an involute spline; the involute spline has a modulus of 2.5mm, 15 teeth, a major diameter of phi40 -0.337mm and a minor diameter of phi33.75 -0.337mm; each of the low-gear driving gear, the high-gear driving gear, the high-gear driven gear and the low-gear driven gear has a pressure angle of 25 degrees; and the power output shaft is an eight-tooth rectangular spline, and the eight-tooth rectangular spline has a tooth width of 7.98 -0.11mm, a major diameter of phi48 -0.087mm and a minor diameter of phi40 -0.1mm. The strength of each of the gears and the shafts is strengthened, and a center distance and a transmission ratio are not required to be redesigned and changed; and the power output mechanical device is particularly suitable for solving the problem of tooth breakage caused by the weak roots of the gears, and has the characteristics of easiness for implementation and high universality.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202244
202127
202038
201960
201841