Automatic transmission damper mechanism

An automatic transmission damper mechanism provided between a first hydraulic passage to which an oil is supplied and a second hydraulic passage from which the oil is supplied to a friction element and adapted to damp a pressure of the oil supplied to the first hydraulic passage and then supply the pressure-damped oil to the friction element via the second hydraulic passage, comprising:

• a container provided between the first hydraulic passage and the second hydraulic passage;
• a slide member provided in the container such that it can slide therein;
• an elastic member provided between the slide member and an inner face of the container,
• a pressure chamber defined in the container by the slide member and another inner face of the container and communicating with a branch hydraulic passage branching from the first hydraulic passage;
• a communication hole which is formed in the slide member and through which the first hydraulic passage and the second hydraulic passage are placed in communication with each other by the elastic member contracting under the pressure of the oil supplied into the pressure chamber of the container through the branch hydraulic passage and
• the slide member having the communication hole is configured so that an axis of the communication hole is offset downward from an axis of the first hydraulic passage and from an axis of the second hydraulic passage when the elastic member is in the most expanded state, and when the oil is supplied to the first hydraulic passage when the elastic member is in the most expanded state, the oil is guided from the first hydraulic passage to both the communication hole and the branch hydraulic passage, and the oil that is guided to the branch hydraulic passage is supplied to the pressure chamber of the container.