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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
06 Apr 2006
TL;DR: In this article, a gear with a Cornu's spiral tooth profile is described, where the diameter of the dedendum of the gear can be replaced with a circular arc curve.
Abstract: A gear with a Cornu's spiral tooth profile, wherein a Cornu's spiral is used in the tooth profile thereof. The Cornu's spiral may be two-dimensionally deformed at a specified rate according to the application of the gear. Since the Cornu's spiral comprises a similarity, when a pressure angle is determined, the tooth profile can be standardized by module and can provide high usability. The application of the gear can be further increased by replacing the portions of the addendum and the dedendum of the gear with other curves such as circular arcs. The engagement of the gear is always performed by the surface contact of a projected surface on a recessed surface. Accordingly, since a contact surface pressure is low and the radius of curvature of the dedendum is large, the bending stress of the teeth of the gear is low and the fatigue strength thereof is also high. Even if the number of teeth is low, undercut does not occur in the teeth of the gear. Since the gear can be smoothly engaged without backlash, it can be suitably used for apparatuses for which accurate positioning is requested.

4 citations

Patent
10 Aug 1977
TL;DR: In this article, a W-N gear which has a surface strength at least nearly maximized for a given addendum and minimum pressure angle is realized by selecting a mean radius for the convex and concave circular arcs of the tooth profile in an appropriate range.
Abstract: A W-N gear which has a surface strength at least nearly maximized for a given addendum and minimum pressure angle is realized by selecting a mean radius for the convex and concave circular arcs of the tooth profile in an appropriate range. Also, a dual=line mesh W-N gear of the character described which has a requisite face width minimized is obtained by selecting a mean arc radius which lies in the range referred to above and enables the addendum and dedendum points of meshing contact to appear at equal angle intervals.

4 citations

Patent
25 Mar 2015
TL;DR: In this article, a gear rolling forming method for overcoming a tooth-form lug defect was proposed, in which at least one rolling wheel is used for rolling a blank, the modulus and pressure angle of the rolling wheels are the same as those of a forming gear, all the rolling wheel rotate in the same direction and perform radial feed along the blank, while the rolling horses roll the blank and gradually withdraws in the radial direction so as to make lugs round.
Abstract: The invention discloses a gear rolling forming method for overcoming a tooth-form lug defect. At least one rolling wheel is used for rolling a blank, the modulus and pressure angle of the rolling wheels are the same as those of a forming gear, all the rolling wheels rotate in the same direction and perform radial feed along the blank, while the rolling wheels roll the blank, a cylindrical wheel is used for rolling a gradually-formed tooth-form tooth crest of the blank and gradually withdraws in the radial direction so as to make lugs round through rolling along with radial stretching of the tooth-form tooth crest, the lugs are formed in rolling of the tooth-form tooth crest, and therefore the forming gear of which the tooth crest is relatively flat and free of the lugs or is with small lugs is obtained. According to the method, in the original rolling process, the cylindrical wheel is additionally arranged and used for synchronously flattening the lugs appearing on the tooth-form tooth crest through rolling, the process is simple and convenient and easy to implement, quality is good after forming, extra machining for cutting off the lugs is omitted or substantially reduced, material is saved, the production efficiency of forming the cylindrical gear through rolling is obviously improved, and the production cost is lowered.

4 citations

Patent
30 Aug 1988
TL;DR: In this paper, the developing unit is supported at three points by two pieces of members for maintaining the spacing from a photosensitive drum at both ends of the developing sleeve at two points with the drum.
Abstract: PURPOSE:To assure sure contact of a developing sleeve and photosensitive drum at two points by providing two degrees of turning freedom to a developing unit CONSTITUTION:The developing unit 2 is supported freely tiltably in a radiation direction of the drum 5 on a straight line 6 parallel with the engaging pressure angle direction past a pitch point 13 of a driving gear 17 at the end of the developing sleeve 4 The developing unit 2 is supported freely rotatably around the engaging pressure angle direction in the place nearest the centroid of the developing unit 2 on the tilting axial line 6 thereof The developing unit is constituted to be supported substantially at one point by imparting said two degrees of freedom thereto The developing unit is supported at three points by two pieces of members for maintaining the spacing from a photosensitive drum at both ends of the developing sleeve The developing sleeve is thereby brought into sure contact at two points with the drum

4 citations

Patent
11 Feb 2004
TL;DR: In this article, a gear with different bearing capacity for forward and reverse force transmission is presented, which is suitable for force transmission with basically fixed transmission direction and occasional reverse transmission, where the main operating surfaces are contacted and the main Operating surfaces are in stepped double-arc tooth form with lower bending stress and higher bearing capacity compared with standard double-arrow tooth form.
Abstract: The present invention relates to mechanics, and is one kind of gear with different bearing capacity for forward and reverse force transmission. The gear is suitable for force transmission with basically fixed transmission direction and occasional reverse transmission. During force transmission in the forward direction, the main operating surfaces are contacted and the main operating surfaces are in stepped double-arc tooth form with lower bending stress and higher bearing capacity compared with standard double-arc tooth form. During force transmission in reverse direction, the subsidiary operating surfaces are contacted and the subsidiary operating surfaces are in great pressure angle involute tooth form with bearing capacity lower than that of double-arc tooth form but higher standardinvolute tooth form.

4 citations


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