VARIABLE VALVE DEVICE FOR INTERNAL COMBUSTION ENGINE

Title:

VARIABLE VALVE DEVICE FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2014/010550

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide a variable valve device for an internal combustion engine that can suppress the occurrence of noise resulting from rattling vibration between inner teeth and a roller even when alternating torque is applied. This variable valve device is provided with: a timing sprocket (1) to which the rotational force is conveyed from the crankshaft, and which has an annular inner tooth configuration unit (19) comprising multiple inner teeth (19a) formed in the inner periphery; a cylindrical eccentric shaft (39) which is provided on the motor output shaft (13) of an electric motor (12), the outer peripheral surface of the cylindrical eccentric shaft being eccentric relative to the rotation center; and multiple rollers (48) which are arranged between the inner teeth and the eccentric shaft, the number of said rollers being less than the number of the inner teeth. Laser sintering is performed from the tips (19b) of the inner teeth of the inner tooth configuration unit to both tooth surfaces (19c, 19c), imbuing a high degree of hardness, and meanwhile, the tooth bottom surface (19d) is not laser sintered, making the thin portion (19e), including said tooth bottom, flexibly deformable.

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Inventors:

YAMANAKA ATSUSHI (JP)
TADOKORO RYO (JP)

Application Number:

PCT/JP2013/068632

Publication Date:

January 16, 2014

Filing Date:

July 08, 2013

Export Citation:

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Assignee:

HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

International Classes:

F01L1/352

Foreign References:

JP2011231700A	2011-11-17
JP2011132808A	2011-07-07
JP2010090889A	2010-04-22
JPS61284519A	1986-12-15

Attorney, Agent or Firm:

KOBAYASHI, Hiromichi et al. (JP)
Hiromichi Kobayashi (JP)

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