Displacement pump for fuel vapor recovery
AssigneeTatsuno Corporation
InventorNaohiro Kokura
Life of this patent
Estimating the term…
Abstract
A displacement pump is configured to allow for assembly while properly maintaining side clearances. The displacement pump (100, 101, 102, 103, 104, 105) for sucking and discharging a fluid such as gasoline vapor by changing pressure in a space constituted by an outer peripheral surface of a rotor (1) and an inner wall surface of a casing (2), includes a side clearance adjusting member (4), rotating with respect to the pump main body (6), for moving a shaft (3) integrally formed with the rotor (1) in an axial direction of the shaft (3).
Claims17
A displacement pump for sucking and discharging a fluid by changing pressure in a space constituted by an outer peripheral surface of a rotor and an inner wall surface of a casing, the displacement pump comprising:
- a pump main body having a wall with an opening formed therein;
- a shaft aligned with the opening of the pump main body and coupled to the rotor;
- a first bearing configured to rotatably support the shaft within the pump main body, the first bearing having an outer ring and an inner ring, the outer ring being axially moveable relative to the inner ring;
- and
- a side clearance adjusting member configured to be rotatably moveable and axially moveable relative to the pump main body and configured to be rotatable relative to the shaft;
- the pump main body, the side clearance adjusting member and the shaft being operatively connected such that rotation of the side clearance adjusting member relative to the pump main body and the shaft causes movement of the shaft relative to the pump main body to facilitate adjustment of a clearance between the pump main body and the rotor, and further comprising:
- a second bearing configured to rotatably support the shaft within the pump main body, the second bearing having an outer ring and an inner ring, the outer ring being axially moveable relative to the inner ring;
- and
- a spacer extending between and in contact with the first bearing and the second bearing.
The displacement pump as claimed in 12, further comprising:
- the outer rings of both the first and second bearings being axially moveable relative to the spacer.
A displacement pump for sucking and discharging a fluid by changing pressure in a defined space, the displacement pump comprising:
- a pump main body having a wall with an opening formed therein;
- a shaft aligned with the opening of the pump main body;
- a bearing configured to rotatably support the shaft within the pump main body, the bearing having an outer ring and an inner ring, the outer ring being axially moveable relative to the inner ring;
- a rotor coupled to the shaft and located adjacent the pump main body such that a clearance is defined between the rotor and the pump main body;
- and
- a side clearance adjuster configured to be rotatably moveable and axially moveable relative to the pump main body;
- the pump main body, the shaft, and the side clearance adjuster being configured such that rotation of the side clearance adjuster relative to the pump main body causes movement of the shaft relative to the pump main body via selective incremental action of the side clearance adjuster on the outer ring relative to the inner ring to facilitate adjustment of the clearance between the rotor and the pump main body, and further comprising:
- a second bearing configured to rotatably support the shaft within the pump main body, the second bearing having an outer ring and an inner ring, the outer ring being axially moveable relative to the inner ring;
- and
- a spacer extending between and in contact with the first bearing and the second bearing.
Dependencies are inferred from the claim text.