Vane pump

Abstract

The purpose of the present invention is to provide a vane pump that is able to prevent decrease of power transmission efficiency when the vane pump is used in combination with a device such as a transmission device, for example. Therefore, this vane pump (10, 20, 50, 60, 70, 80, 90) has a hollow shaft (1, 21, 51, 61, 71, 81, 91), the hollow shaft (1, 21, 51, 61, 71, 81, 91) is configured such that a hollow portion thereof allows a rotation driving shaft (which is, for example, an input shaft 103 of a transmission device as illustrated in FIG. 1, and, which also includes an input shaft which is inserted directly into the transmission device from a driving source 102 without having a coupling interposed therebetween) of the driving source (102) to be inserted therethrough, and the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotation driving shaft (103) are coupled by means of a mechanism (spline, key and key groove, etc.) for transmitting a torque but transmitting no thrust.

1 . A vane pump comprising a hollow shaft, wherein
 the hollow shaft is constructed such that a rotation driving shaft of a driving source can be inserted into a hollow portion; and   the hollow shaft and the rotation driving shaft are connected by a mechanism for transmitting a torque but transmitting no thrust.   
     
     
         2 . The vane pump according to  claim 1 , wherein
 a rotor is mounted on said hollow shaft.   
     
     
         3 . The vane pump according to  claim 2 , wherein
 said hollow shaft and the rotor are mounted such that relative rotation is not possible and movement in an axial direction is limited by a wire ring; and   the wire ring is disposed in a mode across a shaft-side recess portion and a rotor-side stepped portion in a state where the shaft-side recess portion formed on said hollow shaft and the rotor-side stepped portion formed on the rotor are aligned.   
     
     
         4 . The vane pump according to  claim 1 , wherein
 a mechanical seal is provided on both end portions in the axial direction of said hollow shaft; and   a circuit for allowing the mechanical seals on the both end portions to communicate is formed.   
     
     
         5 . The vane pump according to  claim 1 , wherein
 said mechanism for transmitting a torque but transmitting no thrust is splines formed on an inner peripheral surface of the hollow shaft and an outer peripheral surface of the rotation driving shaft.   
     
     
         6 . The vane pump according to  claim 1 , wherein
 said mechanism for transmitting a torque but transmitting no thrust is a key and a keyway.   
     
     
         7 . The vane pump according to  claim 1 , wherein
 said mechanism for transmitting a torque but transmitting no thrust preferably has an engagement groove penetrating the hollow shaft, a through hole of the rotation driving shaft, and a spring pin capable of insertion into the engagement groove and the through hole.   
     
     
         8 . The vane pump according to  claim 1 , wherein
 said mechanism for transmitting a torque but transmitting no thrust is constructed by splines formed on the outer peripheral surface of the rotation driving shaft and the inner peripheral surface of the hollow shaft;   the spline is formed only in a region in the vicinity of the vane in the axial directions of the rotation driving shaft and the hollow shaft;   a region where the splines are not provided in the rotation driving shaft and the hollow shaft constructs a lubricant-oil filling space in which a lubricant oil is filled; and   a sealing member for the lubricant oil is provided in a region on a side separated from a cover portion.   
     
     
         9 . The vane pump according to  claim 1 , wherein
 said mechanism for transmitting a torque but transmitting no thrust is constructed by splines formed on the whole region in the axial direction of the outer peripheral surface of the rotation driving shaft and the inner peripheral surface of the hollow shaft;   a sealing member for the lubricant oil is disposed in a region on a side separated from the cover portion;   the sealing member has projections and recesses formed on an outer periphery thereof; and   the projections and recesses are formed correspondingly to the spline formed on the inner peripheral surface of the hollow shaft.   
     
     
         10 . The vane pump according to  claim 1 , wherein
 the hollow shaft is supported by a supporting member disposed on a side separated from the cover portion and a supporting member disposed in the vicinity of the cover portion.   
     
     
         11 . The vane pump according to  claim 10 , wherein
 a circuit allowing a mechanical seal on the cover portion side and an intake portion to communicate is formed.   
     
     
         12 . The vane pump according to  claim 5 , wherein
 the hollow shaft is supported by a supporting member disposed on a side separated from the cover portion and a supporting member disposed in the vicinity of the cover portion.   
     
     
         13 . The vane pump according to  claim 12 , wherein
 a circuit allowing a mechanical seal on the cover portion side and an intake portion to communicate is formed.