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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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Patent
05 Feb 1969
TL;DR: In this paper, a gear train consisting of driving and driven gear-wheel units 4, 5 (Fig. 2), the distance between their axes of rotation being variable, connected by an idler gear unit 12, each unit comprising a gearwheel 8, 10, 13, and at least one coaxial cylindrical spacer 9,11, 14, the spacer 14 of the idler unit being in rolling contact with those of the driven units when the gear teeth are in correct mesh, the relative disposition of the units is such that the resultant of the forces applied to
Abstract: 1,141,884. Toothed gearing. IMPERIAL METAL INDUSTRIES (KYNOCH) Ltd. 27 April, 1967 [23 May, 1966], No. 22873/66. Heading F2Q. In a gear train comprising driving and driven gear-wheel units 4, 5 (Fig. 2), the distance between their axes of rotation being variable, connected by an idler gear unit 12, each unit comprising a gear-wheel 8, 10, 13, and at least one coaxial cylindrical spacer 9,11, 14, the spacer 14 of the idler unit being in rolling contact with those of the driving and driven units when the gear teeth are in correct mesh, the relative disposition of the units is such that the resultant of the forces applied to the idler gear teeth acts in a line passing between the axes of rotation of units 4, 5 to hold the idler teeth constantly in correct mesh with those of the driving and driven gears. This is so when the angle between a line through the axes of rotation of the units 4, 12 and a line through the axes of rotation of the units 5, 12 is greater than twice the pressure angle of the meshing gear teeth. The spacers have diameters equal to the pitch circle diameters of their respective gear-wheels and are integral therewith. To retain the idler unit when stationary, or on overrun, a spring 15 may be used, or a slipper block (22) (Fig. 6, not shown), or a fixed peg (19) within an annular idler unit (18) (Fig. 5, not shown). If the axes of the units 4, 5 lie substantially in the same horizontal plane and the idler is above them, gravity suffices. In Fig. 7, a belt 29 round pulleys 30, 31 forming axial extensions of the driving and driven units 25, 26 prevents relative rotation of the latter when they are unloaded, to prevent the idler unit 24 from falling out of mesh. In Fig. 8 (not shown) an idler (12) is carried on an arm (34) pivoted on the shaft (6) of the driving unit (4) for use in opposite directions of rotation, a friction coupling between the arm (34) and the shaft (6) moving the idler from one drive position to the other when the drive is reversed. In Fig. 11 the pitch circles of the driving and driven units 35, 40 overlap, the unit 35 having two gear-wheels 36 spaced apart and the spacers 43 of the unit 40 being axially spaced from the gear-wheel 41. Gears 36, 41 mesh a wide idler gear (46) (Fig. 10, not shown). In Fig. 13, a driving unit 52 lies within an internally toothed annular driven unit 49 and is connected thereto by an idler unit 53. The gears may be of metal, rubber, or plastics

2 citations

Journal Article
TL;DR: In this paper, a gear tooth bending test was developed which uses a single tooth specimen having a strain gauge bonded in its fillet region, under the application of load a strain indicator reads out the strain.
Abstract: Altered tooth-sum gearing is a unique type of non-standard gearing having their profiles shifted due to altering the tooth-sum for a specified center distance and module. This approach is aptly termed as Z± gearing because it involves increasing the sum of teeth (positively altered toot-sum or aptly Z+ gearing) or decreasing the sum of teeth (negatively altered tooth-sum or aptly Z− gearing) of the mating gears working on an operating pressure angle. Here, both the center distance and gear ratio remains unaltered, such a study is less explored in gear research. This paper deals with determining experimental bending stress in standard and altered tooth-sum spur gears having involute form, further the results are compared with AGMA bending stress. For this purpose a Gear Tooth Bending Test (GTBT) fixture is developed which uses a single tooth specimen having a strain gauge bonded in its fillet region. Under the application of load a strain indicator reads out the strain. The specimen is a single tooth model having accurate involute profile and circular fillet, it is developed using advanced modeling software and manufactured using CNC machine. From the experiment it is observed that the tooth of Z− gearing subjected to positive profile shift has a lower bending stress (favorable) and the tooth of Z+ gearing subjected to negative profile shift has a higher bending stress (unfavorable, of course with higher contact ratio) compared to the tooth of standard gearing. This infers that the bending strength of a gear tooth can be influenced by altered tooth-sum design. The results obtained closely agree with AGMA values.

2 citations

Journal ArticleDOI
TL;DR: In this paper, a profile modification of steel gear is proposed to prevent tooth profile change of a nylon gear, which meshes with a steel gear, and a reasonable amount of modification is obtained by experiments.
Abstract: As a prevention method of tooth profile change of a nylon gear, which meshes with a steel gear, this paper proposes a profile modification of steel gear. And a reasonable amount of modification is obtained by experiments. From the results, it is clear that the expression of the amount of profile modification Δα (minutes) of steel gear is as follows. Δα = ζ (Tc·T/9.8b) + ξ ζ : Change value of pressure angle change (minutes)/(N·m/m)·s, Tc : Contact period of teeth of nylon gear (second), T : Torque acting on nylon gear (N·m), b : Face width (m), ξ : Basic value of pressure angle change (minutes).

2 citations

Journal Article
TL;DR: In this paper, the force model of a cam is presented, which considers the factors of different materials, different working loads and the acceleration's magnitude of the follower, and a formula for accurate calculation of its pressure angle is also given.
Abstract: The force model of a cam is presented, which considers the factors of different materials, different working loads and the acceleration's magnitude of the follower. A formula for accurate calculation of its pressure angle is also given.

2 citations

Patent
23 Nov 1988
TL;DR: In this paper, the rotor profiles are defined with contiguous elliptic and involute sections to improve the pressure angle, and the profiles are configured to define rotor-to-rotor sealing surfaces in closure of a compressed gas pocket in which, the pocket gas pressure always urges or torques the driven rotor in the positive or forward-rotary direction.
Abstract: The invention concerns helical- or screw-type driving and driven rotors having lands and intervening grooves for coacting engagement, within a housing of a machine, such as a gas compressor or expander, the rotors having improved, more efficient, profiles. The profiles are defined with contiguous elliptic and involute sections to improve the pressure angle, and the profiles are configured to define rotor-to-rotor sealing surfaces in closure of a compressed gas pocket in which, the pocket gas pressure always urges or torques the driven rotor in the positive or forward-rotary direction.

2 citations


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