Hydraulic continuously variable transmission and power transmission apparatus

A hydraulic continuously variable transmission for use with working oil, the hydraulic continuously variable transmission comprising:

• a variable displacement type first hydraulic system having a first plunger and a plunger abutting section which actuates the first plunger;
• a second hydraulic system having a second plunger and provided with an output rotary section which rotates with abutment on the second plunger;
• a cylinder block constructed so as to be rotatable about an axis and provided with a first plunger hole and a second plunger hole which respectively retain the first and second plungers;
• a hydraulic closing circuit for connecting the first and second plunger holes and circulating working oil between the first and second lunger holes;
• a distributing valve for controlling circulation of the working oil in said hydraulic closing circuit;
• a valve hole, formed in said cylinder block, for retaining the distributing valve;
• and
• a shaft which penetrates said cylinder block and rotates in synchronism with the cylinder block and around which said output rotary section is rotatably supported,
• wherein said valve hole is formed in parallel to said shaft, and
• wherein restriction means is provided which is arranged inclined with respect to said shaft and rotates in synchronism with said cylinder block to reciprocate said distributing valve with the distributing valve being restricted, the restriction means including a retainer which has a top surface facing said cylinder block and a bottom surface opposite to the top surface, and the retainer moves said distributing valve toward the insider of said valve hole via contact with said top surface and moves said distributing valve toward the outside of said valve hole via contact with said bottom surface.