Topic
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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25 Oct 2019
TL;DR: In this article, an asymmetric gear design method based on tooth profile inclination deviation was proposed, in which a left-right tooth surface and tooth root complete symmetry small pressure angle tooth profile gear can be designed according to a standard cylinder gear design.
Abstract: The invention provides an asymmetric gear design method based on tooth profile inclination deviation. According to the method, a left-right tooth surface and tooth root complete symmetry small pressure angle tooth profile gear can be designed according to a standard cylinder gear design method, the pressure angle of a large pressure angle tooth profile gear is calculated according to the standardcylinder gear design method and the strength requirement needed for the drive work condition, accordingly, the tooth profile inclination deviation is calculated, then, shape correction is conducted from the involute start circle position on the drive tooth surface of the small pressure angle tooth profile gear according to the tooth profile inclination deviation, and the large pressure angle toothprofile is obtained; and finally, tooth thickness compensation is conducted at the pitch circle position for the large pressure angle tooth profile, and an asymmetric gear in which the drive tooth surface and the reverse dragging tooth surface are different in pressure angle but side clearance is normal is finally obtained. According to the asymmetric gear design method, tooth profile inclinationdeviation shape correction is conducted on the drive tooth surface, the large pressure angle tooth profile is obtained, accordingly, the drive tooth surface can meet the large-torque drive requirement, and the reverse dragging tooth surface meets the low-torque NVH requirement.
1 citations
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TL;DR: In this article, the feasible design spaces of the pressure angle for spur gears are presented by using polar angular functions and the possibility of cusp occuring in each design space is also investigated.
1 citations
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10 Dec 2014
TL;DR: In this article, a planar linkage demonstrator consisting of connecting rods (1), length digital display devices (2), a hinge (3), a pen (4), an angle digital display device (5), fixed hinges (6), and a demonstrating board (7) is presented.
Abstract: The utility model relates to the field of teaching instrument equipment, and particularly to a planar linkage demonstrator. The planar linkage demonstrator comprises the components of: connecting rods (1), length digital display devices (2), a hinge (3), a pen (4), an angle digital display device (5), fixed hinges (6) and a demonstrating board (7). The planar linkage demonstrator is characterized in that: the connecting rods (1) are respectively connected in an one-to-one manner; the length digital display device (2), the hinge (3), the pen (4) and the angle digital display device (5) are successively connected at the middle part; the left end and the right end of each horizontal connecting rod (1) are respectively connected with a fixed hinge (6); and the fixed hinges (6) are connected with the demonstrating board (7). The planar linkage demonstrator has advantages of simple structure and reasonable structure. The planar linkage demonstrator conveniently demonstrates mechanisms of double-crank mechanism, double-rocking-bar mechanism, multiple-rod mechanism, etc. Motion tracks of different points on the linkage can be drawn. A limit position angle can be read through the tracks. The arranged angle digital display device can read a transmission angle and a pressure angle. When the demonstrating mechanism is at a dead center position, the transmission angle is zero.
1 citations
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TL;DR: In this paper, a study of friction loss of spur gears was carried out, using test gears with a center distance a=183 mm and the load for the test gears was comparatively high, i.e., the load was applied up to about 60 % of the Hertzian pressure of tooth surface strength in endurance strength range and the range of circumferential velocity was extended up to 120 m/s.
Abstract: The study of friction loss of spur gears was carried out, using test gears with a center distance a=183 mm. The load for the test gears was comparatively high, i. e., the load was applied up to about 60 % of the Hertzian pressure of tooth surface strength in endurance strength range and the range of circumferential velocity was extended up to about 120 m/s. Generally speaking, we obtained that, the higher the lubricating oil viscosity, the lower the friction loss. Further we found that a most suitable oil viscosity in order to reduce the friction loss exists for the gear unit, including not only the test gears but also the bearings and the gear box. As far as tooth form is concerned, the cutter pressure angle a0=25°gives the lowest friction loss for the gear unit.
1 citations
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19 Feb 2019
TL;DR: In this paper, the screw pitch of a pitch circle is equal to the relation between the pitch circle gear thickness of the machined gear and the pitch diameter of the brute force gear cutting cutter, and the end face pitch circle pressure angle is calculated and obtained.
Abstract: The invention discloses a brute force gear cutting cutter design method. When a gear is cut with brute force, a crossed axis angle is formed between the axis of a brute force gear cutting cutter and the axis of a machined gear, namely, a pair of staggering shafts is formed between the brute force gear cutting cutter and the machined gear, according to the engagement principle of no-gap engagementof a cylinder and the gear, namely, the screw pitch of a pitch circle is equal to the relation between the pitch circle gear thickness of the machined gear and the pitch circle gear thickness of the brute force gear cutting cutter, the end face pitch circle pressure angle of the brute force gear cutting cutter and the end face pitch circle pressure angle of the machine gear are calculated and obtained, and thus, in combination with other known parameters, design of the brute force gear cutting cutter is achieved. When the brute force gear cutting cutter designed by adopting the method machinesthe gear, in comparison with a common gear inserting cutter, the machining efficiency can be improved by 4-8 times, the gear surface roughness Rz is improved by 2-3 levels, and the gear machining precision reaches the ISO7 level.
1 citations