| 摘要 |
A pressure balancing system for an engine (148), comprising an engine valve (155), the head (157) of the engine valve (155) including an outer face (160) adjacent the cylinder (12); a balance piston (159) on the stem (145) of the engine valve (155) and movable in a balance chamber (94), the balance chamber (94) formed by an outer face (161) of the balance piston (159) and recess (86) connected to and extending from the passage (24); and a first balance port (152) including a first control valve (154) therein, the first balance port (152) configured to provide fluid communication between the balance chamber (94) and the cylinder (12), thereby substantially balancing pressure on both the outer face (160) of the head (157) of the engine valve (155) and the outer face (161) of the balance piston (159).
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