JP2007192117A - Oil pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil pump device capable of appropriately performing the discharge pressure control of a working fluid according to an engine load by a simple configuration. <P>SOLUTION: This oil pump device is provided with an oil pump having a first discharge port 31 and a second discharge port 32 for discharging a working fluid; a first oil passage 9 connecting an oil feeding passage 5 for feeding oil to a part to which the working fluid is fed with the first discharge port 31 of the oil pump, and feeding the working fluid from the first discharge port 31 to the oil feeding passage 5; a second oil passage 10 connected to the first discharge port 31 and different from the first oil passage 9; a third oil passage 11 connected with the second discharge port 32; an oil return passage 7 communicated with an intake port 2 and returning the working fluid from the first and second discharge ports 31, 32 to the intake port 2; and a first valve element 4 making the second oil passage 10 communicate with the third oil passage 11 and shutting off the second oil passage from the third oil passage. The drive source of the first valve element 4 is depression at engine manifold. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil pump device having a characteristic that an oil pressure increases as an engine load of a vehicle increases.

  As a technique related to an oil pump capable of controlling the discharge pressure of the working oil, for example, the following Patent Document 1 discloses the following oil pump configuration. As shown in FIG. 5, the oil pump includes a pump body 101 having a pump chamber 110, a rotor 102 that is rotated in the pump chamber 110 by a drive source, and a working oil in the pump chamber 110 as the rotor 102 rotates. And a discharge port 105 that communicates with a supply destination of the working oil, and includes a first discharge port 131 and a second discharge port 132 that discharge the working oil from the pump chamber 110 as the rotor 102 rotates. And the first discharge port 131, the first oil passage 151 for supplying the working oil from the first discharge port 131 to the discharge oil passage 105, the discharge oil passage 105 and the second discharge port 132, A second oil passage 152 that feeds the working oil from the second discharge port 132 to the discharge oil passage 105, and is connected to the second oil passage 152 and sucked in. A feedback oil passage 106 communicating with the port 136, a control device 107 that outputs a control signal in accordance with the oil pressure of the first oil passage 151, the oil temperature, the throttle opening, the rotational speed of the engine that is a drive source, A control valve 104 is provided that is connected to the first oil passage 151, the second oil passage 152, and the return oil passage 106 and operates based on a control signal from the control device 107.

  Here, the control valve 104 is specifically driven by the proportional electromagnetic control means 108. The control device 107 directly or indirectly detects the hydraulic pressure, the oil temperature, the throttle opening degree, and the engine speed of the first oil passage 151, and a predetermined discharge characteristic is obtained based on the detection signal. A control signal for operating the control valve 104 is output. Thereby, according to the use conditions of an engine, it can set to optimal discharge pressure by electromagnetic control, and can reduce useless pump work.

  However, in the configuration of the oil pump as described above, the electromagnetic control means 108 such as a solenoid for driving the control valve 104, the control device 107 for generating a control signal for the electromagnetic control means 108, and further this control It is necessary to provide detection means such as a sensor for outputting information such as oil pressure, oil temperature, throttle opening degree, etc. to the device 107, and the configuration for controlling the discharge pressure of the oil pump becomes complicated, and the oil pump There was a problem that this would cause an increase in manufacturing costs.

Further, Patent Document 1 discloses a method for controlling the discharge characteristics of the oil pump by operating the control valve 104 in accordance with the hydraulic pressure of the first oil passage 151 instead of the electromagnetic control means 108. However, since the oil pressure in the first oil passage 151 changes according to the engine speed, there is a problem that oil cannot be supplied to each part of the engine according to the engine load.
Japanese Patent No. 3531769 (pages 1-2, 6 and 8-9)

  The present invention has been made in view of the above problems, and has an object to provide an oil pump device capable of appropriately performing discharge pressure control of hydraulic oil according to engine load with a simple configuration. To do.

The first technical measure taken to solve the above problems is as follows:
A pump body that divides the pump chamber, a rotor that is rotated in the pump chamber by a drive source, a suction port that sucks hydraulic oil into the pump chamber as the rotor rotates, and hydraulic oil from the pump chamber as the rotor rotates. An oil pump having a first discharge port and a second discharge port for discharging, a supply oil passage for supplying hydraulic oil to a hydraulic oil supply portion, and a first discharge port of the oil pump are connected, and the first discharge A first oil passage for supplying hydraulic oil from a port to the supply oil passage, a second oil passage connected to the first discharge port, and different from the first oil passage, and connected to the second discharge port And a first valve body that communicates and blocks the second oil path and the third oil path, and the first valve body uses an intake negative pressure of the engine as a drive source. It is.

The second technical means is the first technical means,
A feedback oil passage communicating with the suction port and returning the hydraulic oil from the first and second discharge ports to the suction port is provided, and the first valve body includes the second oil passage and the third oil passage. The third oil passage and the return oil passage are communicated with each other.

The third technical means is the first technical means,
It has a second valve body that reciprocates due to the pressure of the hydraulic oil in the first oil passage and communicates and blocks the first oil passage and the return oil passage.

The fourth technical means is the first technical means,
The first valve body is driven by a negative pressure actuator using an intake negative pressure of the engine as a power source.

  According to the first aspect of the present invention, the first valve body communicates and blocks the second oil passage and the third oil passage using the intake negative pressure of the engine as a drive source, so that the first discharge port and the second discharge port are communicated. It becomes possible to control the discharge amount of the working oil from the discharge port group including the ports. In other words, when the engine load is large, the intake negative pressure is reduced, and when the engine load is small, the intake negative pressure is increased. When the engine load is small, the amount of hydraulic oil supplied to each part of the engine is reduced. When the engine load is large, the amount of hydraulic oil supplied to each part of the engine can be increased. In this way, there is no need for a sensor for outputting information such as oil pressure, oil temperature, throttle opening, or the like that detects the state of the engine, or a control device that performs processing based on the detection signal. It is possible to appropriately control the discharge pressure of the corresponding hydraulic oil.

  According to the invention of claim 2, when the first valve body shuts off the second oil passage and the third oil passage, the first discharge port is made to communicate with the third oil passage and the return oil passage. The oil discharged from the oil can be returned to the suction port via the return oil passage, and the oil pump is not locked.

  According to the third aspect of the present invention, even when the hydraulic pressure of the hydraulic oil supplied to the oil supply section becomes excessive, the excess hydraulic oil can be returned to the suction port. Thus, the oil pump does not perform useless work. In addition, the oil pressure of the supplied oil supply section does not become excessively high and does not cause an abnormality such as oil leakage.

  According to the fourth aspect of the present invention, the first valve body is driven by the negative pressure actuator that uses the intake negative pressure of the engine as a power source to thereby control the electromagnetic control means such as a solenoid or the control signal to generate the control signal. It is possible to control the discharge pressure of the working oil with a simple configuration without using a device.

  Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, an oil pump device that is mounted on a vehicle, generates hydraulic pressure using an engine as a drive source, and supplies hydraulic oil to each part of the engine will be described as an example. FIG. 1 is a conceptual diagram showing a configuration of an oil pump device according to the present embodiment. A known pump main body 1 including a rotor (not shown) that is rotationally driven by a crankshaft (not shown), The valve body 8 controls the discharge amount of the working oil, and the negative pressure actuator 12 attached to the valve body 8.

  The pump body 1 includes a first discharge port 31 and a second discharge port 32 through which hydraulic oil is discharged, an intake port 2 for sucking the hydraulic oil, and various parts of the engine to which the hydraulic oil is supplied (the hydraulic oil supply unit). And a suction oil passage 13 that communicates with the oil pan 20 and the like.

  The first discharge port 31 communicates with the feed oil passage 5 via the first oil passage 9 and also communicates with the valve chamber 14 of the valve body 8 via the second oil passage 10. The second discharge port 32 communicates with the valve chamber 14 of the valve body 8 through the third oil passage 11.

  The valve body 8 includes a first valve body 4 that controls the discharge amount of the working oil from the pump body 1 and a second valve body 6 that controls the discharge pressure of the working oil from the pump body 1 in the valve chamber 14. Then, the negative pressure actuator 12 that operates the first valve body 4 with the negative pressure of the intake pipe of the engine, and the feedback that returns the excess hydraulic oil that has passed through the first valve body 4 or the second valve body 6 to the suction port 2 side. And an oil passage 7. Although illustration is omitted, it is possible to adopt a configuration in which the return oil passage 7 is connected to the oil pan 20 or the like to form a drain oil passage.

  The first valve body 4 has a bottomed cylindrical shape and has a concave portion 41 on the side periphery, and is provided in the valve main body 8 so as to be able to reciprocate. The second oil passage 10 and the third oil passage 11 are communicated or blocked.

  The second valve body 6 has a cylindrical shape and is provided in the first valve body 4 so as to be capable of reciprocating. The second valve body 6 is urged in a direction away from the first valve body 4 by the first spring 15, and is fed to the return oil passage 7. The fourth oil passage 16 communicating with the oil supply passage 5 is closed.

  The negative pressure actuator 12 has a well-known structure, and has a first space 12a and a second space 12b divided by a diaphragm 18 that is caulked and attached to a rod 17 that integrally extends from the bottom of the first valve body 4. The second spring 19 is disposed in the second space 12b to urge the rod 17 toward the first space 12a. The second space 12b is connected to an intake pipe of an engine (not shown) through a negative pressure inlet 12c.

  Next, the operation will be described.

  In a state where the engine load is small, that is, in a state where the engine speed is low, the throttle opening of the engine is small, so the intake pipe negative pressure becomes large, and the second space 12b of the negative pressure actuator 12 becomes negative pressure. Then, the diaphragm 18 is sucked, the rod 17 moves in the direction of the second space 12b against the urging force of the second spring 19, and the first valve body 4 closes the second oil passage 10, and the state of FIG. Become.

  In this state, the hydraulic oil discharged from the second discharge port 32 flows from the third oil passage 11 through the first valve body 4 into the return oil passage 7 and is sent to the suction oil passage 13. Only the working oil discharged from the port 31 is sent to the supply oil passage 5. That is, since the amount of oil feeding is small and the work amount of the pump body 1 is also small, the engine load as a drive source is also small.

  Next, as the engine load increases and the throttle opening increases, the intake pipe negative pressure gradually decreases, so the negative pressure in the second space 12b of the negative pressure actuator 12 also decreases gradually. Then, the rod 17 moves in the direction of the first space 12a due to the urging force of the second spring 19, and the first valve body 4 gradually opens the second oil passage 10, and the middle of the opening area of the second oil passage 10 is small. After passing through the position, the second oil passage 10 finally communicates with the third oil passage 11 as shown in FIG.

  In this state, the hydraulic oil discharged from the second discharge port 32 flows into the first discharge port from the third oil passage 11 via the first valve body 4, and therefore, together with the discharge amount from the first discharge port. Thus, the oil pump is sent from the first oil passage to the oil feeding passage, and the oil pump exhibits the maximum oil feeding capacity. That is, the oil supply amount is increased in accordance with an increase in engine load from a state where the oil supply amount is small.

  Further, when the engine speed increases and the amount of oil supplied to the pump body 1 increases and more oil is supplied than is necessary for each part of the engine to which the operating oil is supplied, the operating oil pressure of the oil supply pipe 5 increases. . Then, the second valve body 6 that has closed the fourth oil passage 16 communicating with the return oil passage 7 and the feed oil passage 5 by the urging force of the first spring 15 is moved in the direction of the first valve body 4 by the hydraulic pressure. It moves and it will be in the state of FIG. 3 which connects the return oil path 7 and the feed oil path 5. As shown in FIG.

  In this state, surplus working oil out of the working oil discharged from the first discharge port 31 and the second discharge port 32 of the pump body 1 flows into the return oil passage 7 via the fourth oil passage 16 and the suction oil passage. 13, the amount of hydraulic oil sucked from the oil pan 20 is small, so that the work volume of the pump body 1 is reduced and the engine load as a drive source is also reduced.

  As described above, according to the present embodiment, information such as electromagnetic control means such as a solenoid or oil pressure, oil temperature, throttle opening, etc., for detecting the state of the engine by the negative pressure actuator 12 operated by the intake negative pressure of the engine. It is possible to control the discharge pressure of the working oil in accordance with the engine load with a simple configuration without using a sensor for outputting and a control device that performs processing based on the detection signal.

  In addition, although FIG. 4 shows the structure which contact | abutted the 1st spring 155 to the outer peripheral step part of the 2nd valve body 6 and the end of the 1st valve body 4 as other embodiment, since an action | operation is the same, it is the details. Description of is omitted.

It is a lineblock diagram of the oil pump device concerning this embodiment. It is a block diagram of the oil pump apparatus in an engine low rotation area | region. It is a block diagram of the oil pump apparatus in an engine high rotation area | region. It is a block diagram of the oil pump apparatus which concerns on another embodiment. It is a block diagram which shows the conventional oil pump apparatus schematically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pump main body 2 ... Suction port 31 ... 1st discharge port 32 ... 2nd discharge port 4 ... 1st valve body 5 ... Supply oil path 6 ... 2nd valve Body 7 ... Return oil passage 8 ... Valve body 9 ... First oil passage 10 ... Second oil passage 11 ... Third oil passage 12 ... Negative pressure actuator 13 ... Suction Oil passage 14 ... valve chamber 15 ... first spring 16 ... fourth oil passage
17 ... Rod
18 ... Diaphragm
19 ... Second spring 20 ... Oil pan

Claims (4)

A pump body that divides the pump chamber, a rotor that is rotated in the pump chamber by a drive source, a suction port that sucks hydraulic oil into the pump chamber as the rotor rotates, and hydraulic oil from the pump chamber as the rotor rotates. An oil pump having a first discharge port and a second discharge port for discharging;
A first oil that connects a supply oil passage for supplying hydraulic oil to the hydraulic oil supply section and a first discharge port of the oil pump, and supplies the hydraulic oil from the first discharge port to the supply oil passage. Road,
A second oil passage connected to the first discharge port and different from the first oil passage;
A third oil passage connected to the second discharge port;
A first valve body that communicates and blocks the second oil passage and the third oil passage;
An oil pump device characterized in that the first valve body uses an intake negative pressure of an engine as a drive source. In claim 1,
A feedback oil passage communicating with the suction port and returning the hydraulic oil from the first and second discharge ports to the suction port is provided, and the first valve body includes the second oil passage and the third oil passage. An oil pump device, wherein the third oil passage and the return oil passage are in communication with each other. In claim 1,
An oil pump device comprising: a second valve body that reciprocates due to the pressure of the hydraulic oil in the first oil passage to communicate and block the first oil passage and the return oil passage. In claim 1,
The oil pump device according to claim 1, wherein the first valve body is driven by a negative pressure actuator that uses an intake negative pressure of the engine as a power source.

Images