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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMitsuhiro Umeyama, Masana Kato, Katsumi Inoue
Estimating the term…
Amplitude of transmission error of tooth pair of a gear is obtained in relation to actual contact ratio (.epsilon..sub.r) which is an angular range (.theta..sub.r) of actual contact of the surfaces of the tooth pair divided by an angular pitch (.theta..sub.p) of the gear. The specifications and/or tooth surface modification of the gear is/are are determined so as to reduce the transmission error amplitude under non-load condition in which the actual contact ratio (.epsilon..sub.r) is 1.0. Alternatively, the specifications and/or tooth surface modifications is/are determined so as to increase an effective contact ratio (.epsilon..sub.n) which is an angular range (.theta..sub.n) divided by the angular pitch (.theta..sub.p), the angular range (.theta..sub.n) corresponding to a portion of a path of the tooth contact point in which an edge contact of the tooth pair does not take place at the tooth top or at the ends of the face width of the teeth. These arrangements permit efficient and easy designing of a gear having a reduced noise, without simulations or tests.
A method of designing a gear, wherein at least one of specifications and a tooth surface modification of said gear is determined based on an actual contact ratio of said gear, said actual ratio varying with a load acting on said gear.
A method of designing a gear, wherein at least one of specifications and a tooth surface modification of said gear is determined based on an actual contact ratio of said gear, said actual contact ratio load acting on said gear and being equal to a value .theta..sub.r /.theta..sub.p, wherein .theta..sub.r represents an angular range in which a pair of teeth actually contact each other, while .theta..sub.p represents an angular pitch of said gear, said at least one of said specifications and said tooth surface modification being determined so as to reduce an amplitude of a transmission error of said pair of teeth under a non-load condition in which said actual contact ratio .theta..sub.r /.theta..sub.p is equal to 1.0.
A method of designing a gear, wherein at least one of specifications and a tooth surface modification of said gear is determined based on an effective contact ratio of said gear, said effective contact ratio being equal to a value .theta..sub.n /.theta..sub.p, wherein .theta..sub.n represents an angular range corresponding to a portion of a path of a contact point of a pair of teeth in which said pair of teeth does not have an edge contact on a tooth top thereof or at an end of a face width thereof, while .theta..sub.p represents an angular pitch of said gear, said path of said contact point being determined based on said specifications and said tooth surface modification of said gear.
Dependencies are inferred from the claim text.