Valve mechanism lift adjustment device and method

A lift adjustment device for a valve mechanism connected by a plurality of links to a valve cam that contacts and lifts intake/exhaust valves and a rotating drive shaft connected to a crankshaft, the device comprising:

• a connector pin, inserted into two of the plurality of links, the connects both links and allows for their relative rotation;
• a lift adjustment means wherein the connector pin position is adjustable from a single direction using a prescribed adjustment tool;
• first and second holder mating holes that extend along an adjustment direction at a pin mating portion, with an end open to a pin guide hole, and into which the first and second holders are screwed;
• a first tool-mating portion formed at one end of the first holder to which first adjustment tool mates and turns the first holder;
• and
• a second tool-mating portion formed at one end of the second holder to which second adjustment tool mates and turns the second holder wherein tool insertion holes penetration-formed to allow the second adjustment tool to be inserted through the first holder and the connector pin.

A lift adjustment device for a valve mechanism connected by a plurality of links to a valve cam that contacts and lifts intake/exhaust valves and a rotating drive shaft connected to a crankshaft, the device comprising:

• a connector pin, inserted into two of the plurality of links, that connects both links and allows for their relative rotation;
• and
• a lift adjustment means wherein the connector pin position is adjustable from a single direction using a prescribed adjustment tool;
• an eccentric drive shaft portion located eccentrically to the drive shaft, a control shaft, an eccentric control shaft portion located eccentrically to the control shaft, a rocker arm rotatably supported to the eccentric control shaft portion, a first link that links one end of the rocker arm and the eccentric drive shaft portion, a second link that links the other end of the rocker arm and the valve cam, and an actuator that changes and maintains the rotational position of the control shaft to adjust the valve lift characteristics of the intake and exhaust valves wherein the connector pin is rotatably connected to the rocker arm and the second link.

A lift adjustment device for a valve mechanism connected by a plurality of links to a valve cam that contacts and moves intake/exhaust valves and a rotating drive shaft connected to a crankshaft, the device comprising:

• a connector pin, insertable into a first and a second link of the plurality of links, that connects both links and allows for their relative rotation, the connector pin having an opening;
• a threaded first holder that is insertable into a first threaded hole of the first link under and immediately adjacent to the connector pin, the first holder having an opening adapted to accept an adjustment tool, the first holder opening substantially aligning with the connector pin opening when the first holder is screwed into the first threaded hole;
• and
• a threaded second holder comprising an opening that extends the length of the second holder, the second holder insertable into a second threaded hole of the first link above and adjacent to the connector pin such that the second holder opening aligns with the connector pin opening and the first holder opening allowing insertion of the adjustment tool through the second holder.