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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.


Papers
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Journal ArticleDOI
Lei Li1, Xian Ying Feng1, Zi Ping Zhang1, Xing Chang Han1, Ya Qing Song1 
TL;DR: In this paper, a new type of globoidal indexing cam mechanism with steel ball is presented, and the characteristic of this mechanism has double circular arc section for cam raceway, and it can realize approximate rolling transmission.
Abstract: This paper presents a new type of globoidal indexing cam mechanism with steel ball. The characteristic of this mechanism has double circular arc section for cam raceway. Due to this kind of cam raceway section the mechanism can realize approximate rolling transmission. According to rotary transform tensor theory profile surface equation of globoidal cam is established. Meshing equation is built through meshing theory, and profile surface equation is determined by meshing equation. Based on profile surface equation 3D geometric model for globoidal cam is established. MATLAB software is used to calculate three-dimensional coordinate points, these coordinate points are imported into Pro/E software, and finally 3D model for globoidal cam is established by three-dimensional modeling function of Pro/E software. Pressure angle equation of globoidal cam is also established. On the condition that the other parameters remain unchanged the variation law of values of pressure angle depended on cam angle and indexing plate rotary radius is obtained respectively.

4 citations

Patent
15 Jul 1970
TL;DR: MOROZUMI as mentioned in this paper proposed an internal involute gear in which the number of teeth on the pinion and ring gear differ by 1 or 2 and the contact ratio is greater than 1.
Abstract: 1,198,737. Toothed gearing. M. MOROZUMI. 28 Aug., 1968 [30 Aug., 1967; 30 May, 1968; 31 May, 1968 (2)], No. 41113/68. Heading F2Q. In an internal involute gear in which the number of teeth on the pinion and ring gear differ by 1 or 2 and in which the contact ratio is greater than 1, tooth interference is avoided by addendum modified gear cutting in which the relation between the pinion and ring gear addendum modification coefficients x 1 , x 2 satisfies the equation where α c is the pressure angle, h k the addendum coefficient, and K is 1 when the difference in the number of teeth is 1 or a function of α c when the difference is 2. A reduction gear, Fig. 14, employing such teeth consists of an input shaft 1 with oppositely displaced crank portions 1 1 , 1 11 carrying planet pinions 2, 2 1 meshing with a stationary ring gear 3, the pinions being connected by an Oldham's coupling 7, while a second such coupling 6 connects pinion 2 1 with the output shaft 5. In a modified form, Figs. 16, 17 (not shown), the pinions and output are connected by pins (27) passing through pairs of circular openings (25) in the pinions.

4 citations

Journal ArticleDOI
TL;DR: In this paper, a systematic investigation of effective design parameters for optimum design of a five-speed gearbox is studied, where the tooth bending stress is considered as the objective function, and all geometric design parameters such as module, teeth number etc. are optimised under two different constraints, including tooth contact stress and constant gear center distance.
Abstract: Optimisation of effective design parameters to reduce tooth bending stress for an automotive transmission gearbox is presented. A systematic investigation of effective design parameters for optimum design of a five-speed gearbox is studied. For this aim contact ratio effect on tooth bending stress by the changing of contact ratio with respect to pressure angle is analysed. Additionally, profile modification effects on tooth bending stress are presented. During the optimisation, the tooth bending stress is considered as the objective function, and all the geometric design parameters such as module, teeth number etc. are optimised under two different constraints, including tooth contact stress and constant gear centre distance. It can be concluded that higher the contact ratio results in a reduced tooth bending stress, while higher the pressure angle caused an increase in tooth bending stress and contact stress, since decreases in the contact ratio. In addition, application of positive profile modification on tooth reduces tooth bending stress. All of the obtained optimum solutions satisfy all constraints.

4 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of pressure angle on asymmetric involute spur gears is studied. And the authors present a study on the effect on the asymmetric tooth of the spur gear.
Abstract: A gear is a rotating machine part having cut teeth, which mesh with another toothed part in order to transmit torque. Gears may be spur, helical, bevel or worm in which spur gear is most common type of gear used in engineering applications. In the automobile and aerospace industries, higher strength, higher reliability and lighter weight gears are necessary as lighter automotives continue to be in demand. This has lead to development of new designs, such as gears with asymmetric teeth. The geometry of these teeth is such that the drive side profile is not symmetric to the coast side profile and it is beneficial for special applications where the loading of the gear is uni-directional. In such an instance, the loading on the gear tooth is not symmetric, thus calling for asymmetric teeth. The coefficient of asymmetry is dependent on pressure angle; therefore study of effect on pressure angle on asymmetric tooth is of great importance. This paper presents a study on effect of pressure angle on asymmetric involute spur gear.

3 citations

Journal ArticleDOI
TL;DR: In this article, the authors present the test results about bending fatigue strength of gear tooth under two kinds of repeated 16-step program loads which are gradually increasing or decreasing, and the results show that the longer the program load cycle period is, the longer is the fatigue life.
Abstract: This report presents the test results about bending fatigue strength of gear tooth under two kinds of repeated 16 steps program loads which are gradually increasing or decreasing. Load frequencies are gamma distributed. Materials of test gears are normalized S38C and carburized SCM21. Each of test gears has module 4mm, pressure angle 20 degrees, number of teeth 27 and width 8mm. Miner's cumulative damage theorem is statistically tested and the following facts have become clear : (1) Factor of loading sequence and load frequency distribution are not significant. (2) Factor of material is significant. (3) Fatigue life has a trend that the longer the program load cycle period is, the longer is the fatigue life in comparison with the values calculated from Miner's theorem. (4) Frequency of stress which is higher than fatigue limit strength has little correlation to C. (5) The scatter of Miner's constant C is mainly due to the scatter of fatigue life, and C itself is rather deterministic.

3 citations


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