VARIABLE CAPACITY OIL PUMP
First Claim
1. A variable capacity oil pump comprising:
- a pump constituting member which operatively discharges a working oil sucked from a suction section through a discharge section, with a volume of a plurality of pump chambers varied by a rotational drive through an internal combustion engine;
a movable member which is operatively moved to modify a volume variation quantity of the plurality of pump chambers according to a movement of the movable member;
a biasing mechanism which is installed in a state in which a set load is provided to bias the movable member in a direction in which the volume variation quantity of the plurality of pump chambers is increased;
a first control oil chamber configured to act a force in a direction in which the volume variation quantity of the plurality of pump chambers is decreased upon the movable member in response to a supply of the working oil into the first control oil chamber;
a second control oil chamber configured to act a force in a direction in which the volume variation quantity of the plurality of pump chambers is increased upon the movable member in response to a supply of the working oil into the second control oil chamber;
a switching mechanism formed to enable a switching between a state in which the working oil from the second control oil chamber is exhausted and another state in which the working oil is introduced into the second control oil chamber; and
a control mechanism configured to take a state in which the working oil within the first control oil chamber is exhausted and another state in which the working oil whose pressure is decreased than a discharge pressure from the discharge section is introduced into the first control oil chamber and to perform a pressure regulation for the working oil while applying the pressure to the working oil within the first control oil chamber by introducing the working oil into the first control oil chamber as the discharge pressure becomes larger, in a case where the switching mechanism is in the state in which the working oil is exhausted from the second control oil chamber, and to take a further another state in which the working oil whose pressure is decreased than the discharge pressure from the discharge section is introduced into the second control oil chamber and a still further another state in which an introduction of the working oil into the second control oil chamber via the switching mechanism is interrupted and the working oil within the second control oil chamber is exhausted and to perform the pressure so regulation for the working oil while reducing the pressure to the working oil within the second control oil chamber by exhausting the working oil within the second control oil chamber as the discharge pressure becomes larger, in a case where the switching mechanism is in the other state in which the working oil is introduced into the second control oil chamber, wherein the control mechanism is controlled by a hydraulic pressure of the working oil and a biasing force of a biasing member and the working oil is not introduced into a location of the control mechanism at which the biasing member is arranged.
1 Assignment
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Accused Products
Abstract
A variable capacity oil pump controlling a pump discharge pressure to a two-stage characteristic includes: an electromagnetic switching valve formed to enable a switching between a state in which oil is discharged from a second control oil chamber and a state in which oil is introduced into the second control oil chamber; a pilot valve controlled by a discharge pressure by oil and a biasing force by a control spring and configured to supply a hydraulic pressure to a first control oil chamber in accordance with oil, to interrupt the supply of the hydraulic pressure, and to supply or exhaust the hydraulic pressure to or from second control oil chamber; and an intermediate passage. Oil exhausted from the first and second control oil chambers is not introduced into an inside of a control spring housing chamber in which a control spring of the pilot valve is arranged.
11 Citations
18 Claims
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1. A variable capacity oil pump comprising:
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a pump constituting member which operatively discharges a working oil sucked from a suction section through a discharge section, with a volume of a plurality of pump chambers varied by a rotational drive through an internal combustion engine; a movable member which is operatively moved to modify a volume variation quantity of the plurality of pump chambers according to a movement of the movable member; a biasing mechanism which is installed in a state in which a set load is provided to bias the movable member in a direction in which the volume variation quantity of the plurality of pump chambers is increased; a first control oil chamber configured to act a force in a direction in which the volume variation quantity of the plurality of pump chambers is decreased upon the movable member in response to a supply of the working oil into the first control oil chamber; a second control oil chamber configured to act a force in a direction in which the volume variation quantity of the plurality of pump chambers is increased upon the movable member in response to a supply of the working oil into the second control oil chamber; a switching mechanism formed to enable a switching between a state in which the working oil from the second control oil chamber is exhausted and another state in which the working oil is introduced into the second control oil chamber; and a control mechanism configured to take a state in which the working oil within the first control oil chamber is exhausted and another state in which the working oil whose pressure is decreased than a discharge pressure from the discharge section is introduced into the first control oil chamber and to perform a pressure regulation for the working oil while applying the pressure to the working oil within the first control oil chamber by introducing the working oil into the first control oil chamber as the discharge pressure becomes larger, in a case where the switching mechanism is in the state in which the working oil is exhausted from the second control oil chamber, and to take a further another state in which the working oil whose pressure is decreased than the discharge pressure from the discharge section is introduced into the second control oil chamber and a still further another state in which an introduction of the working oil into the second control oil chamber via the switching mechanism is interrupted and the working oil within the second control oil chamber is exhausted and to perform the pressure so regulation for the working oil while reducing the pressure to the working oil within the second control oil chamber by exhausting the working oil within the second control oil chamber as the discharge pressure becomes larger, in a case where the switching mechanism is in the other state in which the working oil is introduced into the second control oil chamber, wherein the control mechanism is controlled by a hydraulic pressure of the working oil and a biasing force of a biasing member and the working oil is not introduced into a location of the control mechanism at which the biasing member is arranged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A variable capacity oil pump comprising:
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a rotor configured to be drivingly rotated by an internal combustion engine; a plurality of vanes movable out and into an outer peripheral section of the rotor; a cam ring configured to partition an inner peripheral side of the cam ring into a plurality of pump chambers while accommodating the rotor and the vanes into an inner peripheral side of the cam ring, to move to vary an eccentricity quantity with respect to an axial center of the rotor, and thereby to vary a volume variation quantity of the plurality of pump chambers; a suction section which is open to a suction region of the plurality of pump chambers in which a volume is increased in association with a rotation of the rotor; a discharge section which is open to a discharge region of the plurality of pump chambers in which the volume is decreased in association with the rotation of the rotor; a biasing mechanism disposed to have a set load and to bias the cam ring in a direction in which the eccentricity quantity becomes large; a first control oil chamber configured to act a force in a direction in which the eccentricity quantity becomes small upon the cam ring in response to a supply of the working oil into the first control oil chamber; a second control oil chamber configured to act a force in a direction in which the eccentricity quantity becomes large upon the cam ring in response to a supply of the working oil into the second control oil chamber; a switching mechanism formed to enable a switching between a state in which the working oil from the second control oil chamber is exhausted and a state in which the working oil is introduced into the second control oil chamber; and a control mechanism configured to take a state in which the working oil within the first control oil chamber is exhausted and another state in which the working oil whose pressure is decreased than a discharge pressure from the discharge section is introduced into the first control oil chamber and to perform a pressure regulation for the working oil while applying the pressure to the working oil within the first control oil chamber by introducing the working oil into the first control oil chamber as the discharge pressure becomes larger, in a case where the switching mechanism is in the state in which the working oil is exhausted from the second control oil chamber, and to take a further another state in which the working oil whose pressure is decreased than the discharge pressure from the discharge section is introduced into the second control oil chamber and a still further another state in which an introduction of the working oil into the second control oil chamber via the switching mechanism is interrupted and the working oil within the second control oil chamber is exhausted and to perform the pressure regulation for the working oil while reducing the pressure to the working oil within the second control oil chamber by exhausting the working oil within the second control oil chamber as the discharge pressure becomes larger, in a case where the switching mechanism is in the other state in which the working oil is introduced into the second control oil chamber, wherein the control mechanism is controlled by a hydraulic pressure of the working oil and a biasing force of a biasing member and the working oil is not introduced into a location of the control mechanism at which the biasing member is arranged. - View Dependent Claims (18)
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Specification