Valve operating mechanism with roller rocker arm, 4-cycle engine, and motorcycle having 4-cycle engine mounted thereon

Valve operating mechanism with roller rocker arm, 4-cycle engine, and motorcycle having 4-cycle engine mounted thereon

CN
  • CN 1,833,096 A
  • Filed: 07/23/2004
  • Published: 09/13/2006
  • Est. Priority Date: 08/18/2003
  • Status: Active Application
First Claim
Patent Images

1. valve actuating gear comprises:

  • Camshaft with the first valve actuating gear cam and duaspiracle driving mechanism cam,First and second pitman arm shafts, described pitman arm shaft are arranged to make camshaft to be arranged between them,Be bearing in swingably on first pitman arm shaft and have and roll first rocking arm of the roller wheel bearing spare that contacts of the first valve actuating gear cam at the one end, andBe bearing in swingably on second pitman arm shaft and have and roll second rocking arm of the roller wheel bearing spare that contacts of duaspiracle driving mechanism cam at the one end, andWherein, the first and second valve actuating gear cams of camshaft comprise basic circle portion respectively and from the cam nose of described basic circle portion projection, first pitman arm shaft that supports first rocking arm is positioned at by the place ahead at the upwardly extending center line of cylinder axis, camshaft center along the sense of rotation of camshaft, second pitman arm shaft that supports second rocking arm is positioned at the rear of described center line along the sense of rotation of camshaft, andWhen the roller wheel bearing spare of first rocking arm contacted with the basic circle portion of the first valve actuating gear cam, first pitman arm shaft more shifted near described camshaft than the center of rotation of roller wheel bearing part.

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