Vane pump and vane pump manufacturing method

Patent metadata

Field	Value
Publication number	US-2017067462-A1
Application number	US-201515123029-A
Country	US
Kind code	A1
Filing date	Mar 4, 2015
Priority date	Mar 13, 2014
Publication date	Mar 9, 2017
Grant date	—

Abstract

A vane pump includes a rotor; a plurality of vanes; a cam ring; and a pump body having an accommodating concave portion accommodating the cam ring. The cam ring includes a ring fitting portions formed in a plurality of regions on an outer circumference and a ring small-diameter portions formed on the outer circumference so as to have an outer diameter smaller than those of the ring fitting portions. The accommodating concave portion has a body fitting portion to which the ring fitting portions is fitted and a body large-diameter portions formed on the inner circumference in a plurality of regions so as to have an inner diameter lager than that of the body fitting portions.

First claim

1 . A vane pump comprising:
a rotor that is linked to a driving shaft; a plurality of vanes that are provided so as to be able to reciprocate in a radial direction relative to the rotor; a cam ring that has an inner circumferential surface on which tip ends of the vanes slide by rotation of the rotor; and a pump body that has an accommodating concave portion accommodating the cam ring, wherein: the cam ring includes a first ring outer circumferential portion formed on an outer circumference and a second ring outer circumferential portion that has an outer diameter smaller than that of the first ring outer circumferential portion and is formed on the outer circumference; the accommodating concave portion of the pump body has a first body inner circumferential portion formed on an inner circumference and a second body inner circumferential portion that has an inner diameter greater than that of the first body inner circumferential portion and is formed on the inner circumference; and the accommodating concave portion of the pump body and the cam ring are not fitted to each other in a state in which the first ring outer circumferential portion faces against the second body inner circumferential portion, and the accommodating concave portion and the cam ring are fitted to each other by relatively rotating the cam ring with respect to the pump body from this state such that the first ring outer circumferential portion faces against the first body inner circumferential portion.

2 . The vane pump according to claim 1 , wherein,
each region of the first ring outer circumferential portion and respectively corresponding each region of the second body inner circumferential portion are formed such that an angle range of the first ring outer circumferential portion is equal to or less than an angle range of the second body inner circumferential portion.

3 . The vane pump according to claim 1 , wherein,
the cam ring has a ring connecting portion connecting the first ring outer circumferential portion and the second ring outer circumferential portion, the accommodating concave portion has a body connecting portion connecting the first body inner circumferential portion and the second body inner circumferential portion, and at least one of the ring connecting portion and the body connecting portion functions as a guiding portion that guides entrance of the first ring outer circumferential portion to the first body inner circumferential portion by relative rotation of the cam ring with respect to the pump body.

4 . The vane pump according to claim 3 , wherein,
at least one of the ring connecting portion and the body connecting portion functioning as the guiding portion is formed such that a diameter is gradually reduced from the first ring outer circumferential portion or the second body inner circumferential portion formed to have a large diameter towards the second ring outer circumferential portion or the first body inner circumferential portion formed to have a small diameter.

5 . The vane pump according to claim 1 , wherein,
pump chambers are defined by the adjacent vanes and the inner circumferential surface of the cam ring, and the first ring outer circumferential portion faces against the first body inner circumferential portion in a discharge region where the pump chambers are contracted as the rotor is rotated and the cam ring and the pump body are fitted to each other.

6 . A vane pump manufacturing method in which
the vane pump includes: a rotor that is linked to a driving shaft; a plurality of vanes that are provided so as to be able to reciprocate in a radial direction relative to the rotor; a cam ring that has an inner circumferential surface on which tip ends of the vanes slide; and a pump body that has an accommodating concave portion accommodating the cam ring, the cam ring has a first ring outer circumferential portion formed on an outer circumference and a second ring outer circumferential portion that has an outer diameter smaller than that of the first ring outer circumferential portion and is formed on the outer circumference, and the accommodating concave portion of the pump body has a first body inner circumferential portion formed on an inner circumference and a second body inner circumferential portion that has an inner diameter greater than that of the first body inner circumferential portion and is formed on the inner circumference, wherein the manufacturing method comprises an inserting step of accommodating the cam ring into the accommodating concave portion of the pump body such that the first ring outer circumferential portion coincides with the second body inner circumferential portion, and a fitting step of making the first ring outer circumferential portion enter the first body inner circumferential portion to achieve fitting by relatively rotating the cam ring with respect to the pump body.

Assignees

• Kyb Corp

Inventors

• Sugihara Masamichi
• Fujita Tomoyuki
• Nakagawa Tomoyuki
• Komiya Tsutomu

Classifications

• F04C15/00

  Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00 (of pumps specially adapted for elastic fluids F04C18/00 - F04C29/00) · CPC title

• F04C2240/20

  Rotors · CPC title

• F04C2/3448 Primary

  with axially movable vanes · CPC title

• F04C2240/10

  Stators · CPC title

• F04C2230/603

  Centering; Aligning · CPC title