JP2015094252A5 - - Google Patents

Description

In one embodiment, it has formed one of the tooth side surface 3B of the internal 3A arc may be formed with trochoidal curve or a cycloid curve. The inner one of the tooth side surface 3B of the tooth 3A is formed in an arc, but one of the teeth side surface 4B of the external teeth 4A was formed by an envelope curve that is created by the arc, on the contrary, one of the external teeth 4A forming a tooth side surface 4B in an arc, it may be formed one of the tooth side surface 3B of the internal 3A with envelope curves created by the arc. Further, although the two discharge ports 8 and 9 are provided, three or more discharge ports may be provided. Furthermore, although the discharge port 8 located on the rear side in the rotational direction A of the gears 3 and 4 is set to a high pressure, the discharge port 9 located on the front side in the rotational direction A is set to a low pressure, but located on the rear side in the rotational direction A. Needless to say, the discharge port 8 that is positioned on the front side in the rotation direction A may be set to a high pressure with the discharge port 8 that performs the low pressure.

1: Pump body 2: Housing hole 2A: Bottom surface (sliding contact surface)
3: internal gear 3A: internal teeth 3B, 4B: one tooth side face 3C, 4C: other tooth side surface 4: external gear 4A: outer teeth 7: suction port 8, 9: discharge port 10: Hanarekabe V1, V2, V3, V4, V5, V6, V7, V8, V9, V10: pump chamber S: suction area space P: discharge area space X: first partition gap Y1, Y2: second partition gap

Claims (3)

A ring-shaped internal gear having internal teeth is rotatably accommodated in the accommodation hole of the pump body, and the external gear having external teeth that mesh with the internal teeth of the internal gear is eccentric to the internal gear. A suction area space is formed between the two gears in a region where the meshing gap between both teeth is increased by the rotation of both gears, and a discharge region space is defined in a region where the meshing gap between both teeth is decreased by the rotation of both gears. The pump chamber is partitioned by the internal teeth of the internal gear and the external teeth of the external gear, and the pump chamber increases in volume in the suction area and decreases in discharge area by rotation of both gears. The slidable contact surface of the pump body, in which the side surfaces of both gears accommodated in the accommodation hole are in slidable contact, opens the suction port in communication with the suction region space, and rotates both gears in communication with the discharge region space. Open at least two discharge ports that are spaced apart Comprising a Hanarekabe the intercluster, the internal teeth and external teeth, one tooth side surface of the opposite rotational directions to each other on Hanarekabe, the pump chamber and the other discharge port communicating with one of the discharge port thereby shaped to set the first partition gap for partitioning between the pump chamber communicating with the other of the tooth side surface serving as a one opposite rotational direction so as to oppose each other in the suction zone space, the first partition gap An internal gear pump characterized in that it is formed in a shape that sets a second partition gap that communicates between a plurality of pump chambers that communicate with the suction port with a larger gap . Wherein one of the inner teeth and the outer teeth, the other of the tooth side surface, the apex of the tooth tip a maximum curvature, it is formed by the curve gradually reducing the curvature toward the tooth bottom, and the outer teeth and the other of the inner teeth, the internal gear pump according to claim 1, characterized by forming said other of the tooth side surface, in the envelope curves created by the curve. One of the inner teeth and the outer teeth, the one tooth side surface, is formed in a circular arc, the other of the inner teeth and the outer teeth, the one tooth side surface, by the arc The internal gear pump according to claim 1, wherein the internal gear pump is formed by an envelope curve created.