Claims
- 1. A belt drive device, comprising:
- a driving sprocket;
- a plurality of driven sprockets;
- an endless toothed belt adapted to transmit a driving force from said driving sprocket to said plurality of driven sprockets; and
- a dynamic damper having a mass body and an elastic body for holding the mass body mounted on a predetermined one of said plurality of driven sprockets that has the largest amplitude of torque fluctuation among said plurality of driven sprockets.
- 2. The belt drive device of claim 1, wherein, among said plurality of driven sprockets, said predetermined one of said plurality of driven sprockets is located on the most tensile side of said endless toothed belt.
- 3. The belt drive device of claim 1, wherein said predetermined one of said plurality of driven sprockets is the sprocket of a fuel pump, and the sprocket of a camshaft is included in said plurality of driven sprockets.
- 4. The belt drive device of claim 1, further comprising:
- an autotensioner adapted to adjust tension of said endless toothed belt to maintain the natural frequency of the belt drive system constant, such that the natural frequency is maintained in agreement with the natural frequency of said dynamic damper, said autotensioner including an idler pulley in engagement with said endless toothed belt and a spring unit adapted to apply the tension to said belt through said idler pulley.
- 5. The belt drive device of claim 1, wherein said driving sprocket is the sprocket for a crankshaft.
- 6. The belt drive device of claim 1, wherein said predetermined one of said plurality of driven sprockets includes,
- an inner annular portion,
- an outer annular portion, and
- a wall extending between said inner annular portion and said outer annular portion in a radial direction of said predetermined one of said plurality of driven sprockets.
- 7. The belt drive device of claim 6, wherein said dynamic damper includes,
- a pipe fixedly fitted on an outer peripheral surface of said inner annular portion, and
- an elastic rubber ring fixedly attached to an outer peripheral surface of said pipe,
- wherein said mass body is fixedly attached to an outer peripheral surface of said elastic rubber ring, and
- wherein outer surfaces of said mass body is spaced apart from an inner peripheral surface of said outer annular portion and said wall.
- 8. The belt drive device of claim 6, wherein said dynamic damper includes,
- a pipe fixedly fitted on an inner peripheral surface of said outer annular portion, and
- an elastic rubber ring fixedly attached to an inner peripheral surface of said pipe,
- wherein said mass body is fixedly attached to an inner peripheral surface of said elastic rubber ring, and
- wherein outer surfaces of said mass body is spaced apart from an outer peripheral surface of said inner annular portion and said wall.
- 9. The belt drive device of claim 6, wherein said dynamic damper includes,
- an elastic rubber ring fixedly attached to said wall,
- wherein said mass body is fixedly attached to said elastic rubber ring, and
- wherein outer and inner peripheral surfaces of said mass body are spaced apart from an inner peripheral surface of said outer annular portion and an outer peripheral surface of said inner annular portion, respectively.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-102179 |
Apr 1996 |
JPX |
|
Government Interests
This application claims the benefit under 35 U.S.C. .sctn.371 of prior PCT International Appliction No. PCT/JP97/01362 which has an International filing date of Apr. 21, 1997 which designated the United States of America, the entire contents of which are hereby incorporated by reference.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/JP97/01362 |
4/21/1997 |
|
|
12/9/1997 |
12/9/1997 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO97/40291 |
10/30/1997 |
|
|
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5405296 |
Cerny et al. |
Apr 1995 |
|
Foreign Referenced Citations (8)
Number |
Date |
Country |
4426529A1 |
Feb 1996 |
DEX |
196 20 745A1 |
Dec 1996 |
DEX |
61-198746 U |
Dec 1986 |
JPX |
62-20950 |
Jan 1987 |
JPX |
5288250 |
Nov 1993 |
JPX |
673374 U |
Oct 1994 |
JPX |
175429 |
Feb 1922 |
GBX |
9218754 A1 |
Oct 1992 |
WOX |