Internal gear machine with rotary valve disk

An internal gear machine, comprising a housing defining an intake port and a discharge port;

• a fluid displacement unit arranged in said housing and including a rotary shaft defining a central axis;
• an outer gear coupled for joint rotation to said shaft;
• an inner gear in sliding engagement with said outer gear and supported for performing a wobbling movement in said housing about said center axis, said inner and outer gears defining a plurality of variable chambers therebetween;
• flow control means including a rotary disk coupled for joint rotation to said shaft and forming a lateral boundary wall for said chambers, said rotary disk having a plurality of first control openings communicating with the interstices between the teeth of said outer gear, and a stationary control plate adjoining said rotary disk and being formed with a plurality of second control openings cooperating with said first control openings, a part of said second control openings communicating with said intake port and another part of said second control openings communicating with said discharge port, and wherein the root circle of said outer gear extends approximately to the middle of the radial extension of said first control openings.

An internal gear machine, comprising a housing defining an intake port and a discharge port;

• a fluid displacement unit arranged in said housing and including a rotary shaft defining a center axis;
• an outer gear coupled for joint rotation to said shaft;
• an inner gear in sliding engagement with said outer gear and supported for performing a wobbling movement in said housing about said center axis, said inner and outer gears defining a plurality of variable chambers therebetween;
• a rotary disk coupled for joint rotation to said shaft and forming a lateral boundary wall for said chambers;
• said rotary disk having a plurality of first control openings communicating with the interstices between the teeth of said outer gear;
• a stationary control plate adjoining said rotary disk and being formed with a plurality of second control openings cooperating with said first control openings, a part of said second control openings communicating with said intake port and another part of said second control openings communicating with said discharge port;
• said housing further including a housing cover connected to the outer face of said stationary control plate, said housing cover having a stepped central bore, a stepped plunger accommodated in said stepped central bore and defining therewith two annular spaces connected respectively to said intake port and to said discharge port and communicating with said second control openings in said stationary plate;
• said plunger being spring-biased against said stationary control plate;
• and said plunger and said housing cover being provided with aligned central passages for discharging leakage fluid from said housing.