Timing chain pivoting guide having a rubber spring element
View Patent ↗The rubber element is positioned in the drive end of the chain guide and provides dampening and noise reduction for the guide, thereby reducing the overall noise from the meshing of the chain and the guide.
1. A tight side tensioning guide for a timing chain drive system of an internal combustion engine, the system having a drive wheel, at least one driven wheel and a chain connecting the drive wheel and driven wheel, the guide positioned on the tight side between the drive wheel and the driven wheel, the guide comprising:
a guide rail having a guide surface for the chain on one side of the rail;
a drive end facing the drive wheel;
a driven end facing the driven wheel;
a drive end mounting hole for a drive end mounting bolt and driven end mounting hole for a driven end mounting bolt, the drive end mounting hole and the driven end mounting hole being on the other side of the rail; and
a single rubber element positioned entirely within the drive end mounting hole and having a bore for the drive end mounting bolt,
wherein the rubber element extends axially through the drive end mounting hole and includes a rubber ring and a corrugated rubber sleeve, the ring extending radially outwardly from the corrugated rubber sleeve, the sleeve has an outer and an inner profile that both consist of a series of peaks and valleys.
2. The guide of claim 1 , wherein the ring extends axially along the sleeve from one axial end of the sleeve to the axial middle of the sleeve.
3. The guide of claim 2 , wherein the ring has a rubber shoulder extending radially outward from the ring and towards the guide surface.
4. The guide of claim 2 , wherein there are two rubber shoulders each extending radially outward from the ring, one towards the guide surface and one away from the guide surface.
5. The guide of claim 1 , wherein the ring has a plurality of axial blind bores spaced radially outward from the sleeve.
6. The guide of claim 1 , wherein a driven end bushing is positioned in the driven end mounting hole for accommodating the driven end mounting bolt.
7. The guide of claim 1 , wherein a drive end bushing is positioned in the sleeve for accommodating the drive end mounting bolt.
8. The guide of claim 1 , wherein the drive end mounting hole has a stepped wall.