This International Standard specifies the minimum requirements for enclosed, precision, single and double helical,<\/p>\n
one- and two-stage speed increasers and reducers of parallel shaft design with pinion speeds of 3000 min-1 or<\/p>\n
greater, or pitch line velocities of 25 m\/s or greater, for special purpose applications. Such applications will typically<\/p>\n
be required to operate continuously for extended periods, without installed spare equipment and are critical to the<\/p>\n
continued operation of the installation. By agreement this International Standard may be used for other services.<\/p>\n
This International Standard also specifies a method of rating gears which meet the following criteria:<\/p>\n
a) gear accuracy<\/p>\n
? teeth accuracy: accuracy grade 4 or better as given in ISO 1328-1:1995, for both single pitch deviation, f<\/i>pt,<\/p>\n
and total cumulative pitch deviation, F<\/i>p,<\/p>\n
? total helix deviation F<\/i>\u00df between the helices of the pinion and wheel: accuracy grade 4 or better as given in<\/p>\n
ISO 1328-1:1995;<\/p>\n
b) range of the transverse contact ratios: 1,2 < ea < 2,0;<\/p>\n
c) overlap ratio e\u00df W 1,0;<\/p>\n
d) helix angle: 5 u \u00df u 35\u00b0;<\/p>\n
e) working flanks of the pinion or gear: provided with profile modifications to obtain a good conjugate tooth load<\/p>\n
distribution along the path of contact;<\/p>\n
f) working flanks of pinion or gear: modified as necessary to compensate for both torsional and bending<\/p>\n
deflections and, when necessary for gears with pitch line velocities in excess of 100 m\/s, also for thermal<\/p>\n
distortions;<\/p>\n
g) gear lubrication: straight mineral oil, viscosity grade VG-32 or VG-46 (see ISO 3448);<\/p>\n
h) material of the gear teeth: quality MQ or better, in accordance with ISO 6336-5:1996.<\/p>\n","protected":false},"excerpt":{"rendered":"
Petroleum and natural gas industries \u2014 High-speed special-purpose gear units<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ISO<\/b><\/a><\/td>\n 2001-12<\/td>\n 78<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":590913,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[325,2634],"product_tag":[],"class_list":{"0":"post-590899","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-21-200","7":"product_cat-iso","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/590899","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/590913"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=590899"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=590899"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=590899"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}