Engine starter with impact absorber

  • US 20040180746A1
  • Filed: 03/09/2004
  • Published: 09/16/2004
  • Est. Priority Date: 03/11/2003
  • Status: Active Grant
First Claim
Patent Images

1. An engine starter comprising:

  • a motor working to output torque;

    a torque transmitting mechanism working to transmit the torque outputted by said motor to a ring gear of an engine, said torque transmitting mechanism including (a) a planetary gear train equipped with planet gears supported rotatably by gear spindles which are joined to a carrier plate, (b) an overrunning clutch including a clutch outer to which torque produced by reducing speed of an output of said motor through said planetary gear train is added through the carrier plate, a clutch inner having an inner helical spline formed on an internal circumferential wall thereof, and rollers, said overrunning clutch working to transmit the torque of the clutch outer to the clutch inner through the rollers, (c) an output shaft having an external helical spline which meshes with the internal helical spline of the clutch inner of said overrunning clutch for establishing travel of said output shaft within the clutch inner through a relative rotation between the external and internal helical splines, and (d) a pinion gear installed on said output shaft to be displaceable by the travel of said output shaft away from said motor to establish mechanical engagement with the ring gear of the engine; and

    an impact absorber working to absorb an, undesirable impact energy applied to said power transmitting mechanism, said impact absorber including at least one friction plate between the carrier plate and the clutch outer, when an impact torque added to said torque transmitting mechanism is smaller than a given level, the friction plate working to hold the carrier plate and the clutch outer from rotating relative to each other;

    when the impact torque is greater to the given level, the friction plate permitting the carrier plate and the clutch outer from rotating relative to each other to absorb the undesirable impact energy acting on said power transmitting mechanism.

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