Honda Giken Kogyo Kabushiki Kaisha

Shigeru Nagai

Hiromitsu Sato

Masayuki Kumada

Takanao Uchida

Hiromi Shimada

Yasuhide Sakamoto

Masashi Kawamata

Hideji Ohura

The present invention provides a design method, which makes the product development more efficient. The design is performed with the process including the following steps; a first step to prepare a three-dimensional CAM model S, a second step to perform a CAE analysis for the three-dimensional CAM model S, a third step to correct the three-dimensional CAM model on the basis of the CAE analysis if the defects exist S, a fourth step to manufacture a mold on the basis of the three-dimensional CAM model S, a fifth step to manufacture a trial product with the mold S, a sixth step to test the trial product S, a seventh step to correct the three-dimensional CAM model if the defects exist S, an eighth step to iterate the fourth through seventh steps until the defects are solved (S, Sthrough S), a ninth step to prepare the drawings on basis of the three-dimensional CAM model obtained at the eighth step S

Method of designing product using 3-dimensional model

Disclosed is a centrifugal spark-advance control device for an ignition system of an internal combustion engine, comprising: a base plate which rotates at a speed corresponding to the rotational speed of the engine; a timing plate which is rotatably supported on the base plate; a spring for biasing the timing plate in a certain direction; a centrifugal weight which is pivoted to the base plate at a point spaced from the center of gravity of the centrifugal weight and which is provided with a cam surface for rotatably driving the timing plate in an opposite direction against the biasing force of the spring by cooperating with a corresponding cam follower surface provided in the timing plate; a spark generating device coupled to the timing plate for generating ignition sparks in synchronism with the rotational angle of the timing plate; a mass member attached to the timing plate by way of an elastic member. Since the mass member is elastically supported by the timing plate, undesirable vibration of the timing plate is minimized by the action of a dynamic damper provided by the mass member and the accuracy in ignition timing is assured.

Centrifugal spark-advance control device

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Saitama, Japan

Shigeru Nagai