Variable-capacity vane pump
a vane pump, variable-capacity technology, applied in the direction of machines/engines, rotary/oscillating piston pump components, liquid fuel engines, etc., can solve the problems of increased space and cost requirements, difficult to raise the freedom of control range, and increase the number of components. , to achieve the effect of excellent durability and reliability, reducing installation space and reducing the number of components
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first embodiment
[0035]There are two embodiments for the internal housing 3. A first embodiment for the internal housing 3 is a linear moving type. The internal housing 3 can move inside the accommodating chamber 12 of the pump housing 1 due to external oil pressure. As stated above, the vane rotor 2 has an immovable position with respect to the accommodating chamber 12 of the pump housing 1, and the internal housing 3 is able to move with respect to the accommodating chamber 12. In other words, the vane rotor 2 and the internal housing 3 move positions relative to each other.
[0036]The rotor chamber 32 moves with the movement of the internal housing 3, and due to the movement of the rotor chamber 32, the interval between the centre of rotation Pa of the vane rotor 2 and the centre of diameter Pb of the rotor chamber 32 varies and the oil discharge volume changes. When the interval between the centre of rotation Pa of the vane rotor 2 and the centre of diameter Pb of the rotor chamber 32 becomes smal...
second embodiment
[0051]Alternatively, the temperature-sensitive valve 4 and the flow passage near the intake section 13 of the pump housing 1 are communicated via the third control oil passage J3 on the downstream side (see the third control oil passage J3 indicated by the dotted line in FIG. 11). In the specifications of the temperature-sensitive valve 4, a flow passage to the third control oil chamber S3 is not provided in the pump housing 1, and hence there is no inflow and outflow of oil to and from the third control oil chamber S3 (see FIG. 11).
[0052]The pressure adjustment valve 5 discharges the oil in the second control oil chamber S2. There are a plurality of embodiments for the pressure adjustment valve 5. Firstly, a first embodiment for the pressure adjustment valve 5 is described. The pressure adjustment valve 5 is mainly provided with a cylinder 51, a spool valve body 52, an elastic member 53, and the like. A cylinder inflow section 510, a first inflow port 511, a second inflow port 512,...
third embodiment
[0075]Moreover, when the spool valve body 52 moves towards the opposite side from the cylinder inflow section 510 due to the increase in the pressure of the discharge oil, the valve interior inflow hole 525 and the second inflow port 512, and the second discharge port 514 and the valve interior outflow hole 526 are communicated with each other via the valve interior chamber section 524, and a second-stage oil discharge of the oil inside the second control oil chamber S2 is performed. In this third embodiment, at an oil pressure between the first-stage oil discharge and the second-stage oil discharge, there is a range where discharge of oil stops.
[0076]Next, the operation of the first control oil chamber S1, the second control oil chamber S2, the third control oil chamber S3, the temperature-sensitive valve 4, and the pressure adjustment valve 5 of the variable-capacity vane pump according to the present invention will be described. Firstly, the first branch oil k1 is communicated wi...
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