JP2018150886A - Oil pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil pump of which sucking-up performance immediately after start-up of an oil pump is improved.SOLUTION: In an oil pump, a communication part communicated to a cylinder storing a pump element of an oil suction path communicating to a suction port is disposed upward in a gravity direction relative to the suction port.SELECTED DRAWING: Figure 2

Description

The present invention relates to an improvement in the arrangement of a suction passage of an oil pump.

  Patent Document 1 discloses an oil reservoir formed by opening an oil suction path communicating with a suction port at a position higher than the lowermost portion of the pump element, and being formed below the opening.

Japanese Patent Laid-Open No. 10-30417

  However, in the technique of Patent Document 1, since the oil reservoir is relatively shallow, the pump is not sufficiently filled with oil, and the pumping performance of the pump immediately after starting may not be sufficiently improved.

The present invention has been made in view of such technical problems, and an object thereof is to provide a pump having improved suction performance immediately after the pump is started.
The oil pump according to the present invention is characterized in that the communicating portion with the cylinder that houses the pump element of the oil suction path communicating with the suction port is disposed above the suction port in the gravity direction.

  Therefore, in the oil pump of the present invention, the oil backflow from the suction port can be suppressed even when the oil pump is stopped, and the oil can be sufficiently stored in the suction port. Can be improved.

1 is a schematic configuration diagram of a vehicle including an electric pump according to a first embodiment. It is sectional drawing which shows the structure of the principal part of the electric oil pump of Example 1. FIG.

[Example 1]
FIG. 1 is a schematic configuration diagram of a vehicle including the electric pump according to the first embodiment.

  This vehicle includes an engine 1 as a drive source, and the output rotation of the engine 1 is a torque converter 2 with a lockup clutch, a first gear train 3, a continuously variable transmission (hereinafter simply referred to as “transmission 4”), and a first. It is transmitted to the drive wheels 7 through the two gear trains 5 and the final reduction gear 6. The second gear train 5 is provided with a parking mechanism 8 that mechanically locks the output shaft of the transmission 4 at the time of parking.

  The transmission 4 includes a mechanical oil pump 10 m that receives rotation of the engine 1 and is driven by using a part of the power of the engine 1, and an electric oil pump 10 e that is driven by receiving power supply from the battery 13. Is provided. The electric oil pump 10e includes an oil pump main body, an electric motor and a motor driver that rotationally drive the oil pump main body, and can control the operation load to an arbitrary load or in multiple stages. Further, the transmission 4 is provided with a hydraulic control circuit 11 that regulates the hydraulic pressure (hereinafter referred to as “line pressure PL”) from the mechanical oil pump 10 m or the electric oil pump 10 e and supplies it to each part of the transmission 4. It has been.

  The transmission 4 includes a belt-type continuously variable transmission mechanism (hereinafter referred to as “variator 20”) and an auxiliary transmission mechanism 30 provided in series with the variator 20. “Provided in series” means that the variator 20 and the auxiliary transmission mechanism 30 are provided in series in the power transmission path from the engine 1 to the drive wheels 7. The auxiliary transmission mechanism 30 may be directly connected to the output shaft of the variator 20 as in this example, or may be connected via another transmission or power transmission mechanism (for example, a gear train). Alternatively, the auxiliary transmission mechanism 30 may be connected to the front stage (input shaft side) of the variator 20.

  The variator 20 includes a primary pulley 21, a secondary pulley 22, and a V belt 23 that is wound around the pulleys 21 and 22. Each of the pulleys 21 and 22 includes a fixed conical plate, a movable conical plate that is arranged with a sheave surface facing the fixed conical plate, and forms a V-groove between the fixed conical plate, and the movable conical plate. The hydraulic cylinders 23a and 23b are provided on the back surface of the movable cylinder to displace the movable conical plate in the axial direction. When the hydraulic pressure supplied to the hydraulic cylinders 23a and 23b is adjusted, the width of the V groove changes, the contact radius between the V belt 23 and each pulley 21 and 22 changes, and the transmission ratio of the variator 20 changes steplessly. .

  The subtransmission mechanism 30 is a transmission mechanism having two forward speeds and one reverse speed. The sub-transmission mechanism 30 is connected to a Ravigneaux type planetary gear mechanism 31 in which two planetary gear carriers are connected, and a plurality of friction elements connected to a plurality of rotating elements constituting the Ravigneaux type planetary gear mechanism 31 to change their linkage state. Fastening elements (Low brake 32, High clutch 33, Rev brake 34) are provided. When the hydraulic pressure supplied to each of the frictional engagement elements 32 to 34 is adjusted and the engagement / release state of each of the frictional engagement elements 32 to 34 is changed, the gear position of the auxiliary transmission mechanism 30 is changed.

  For example, if the Low brake 32 is engaged and the High clutch 33 and the Rev brake 34 are released, the gear position of the subtransmission mechanism 30 is the first speed. If the high clutch 33 is engaged and the low brake 32 and the rev brake 34 are released, the speed stage of the subtransmission mechanism 30 becomes the second speed having a smaller speed ratio than the first speed. Further, if the Rev brake 34 is engaged and the Low brake 32 and the High clutch 33 are released, the shift speed of the subtransmission mechanism 30 is reverse. In the following description, it is expressed that “the transmission 4 is in the low speed mode” when the shift speed of the auxiliary transmission mechanism 30 is the first speed, and “the transmission 4 is in the high speed mode” when the speed is the second speed. ".

  The controller 12 is a controller that integrally controls the engine 1 and the transmission 4. The controller 12 receives an output signal of an accelerator opening sensor 41 that detects an accelerator opening APO that is an operation amount of an accelerator pedal, an output signal of a rotation speed sensor 42 that detects an input rotation speed of the transmission 4, and a vehicle speed VSP. The output signal of the vehicle speed sensor 43 to detect, the output signal of the line pressure sensor 44 to detect the line pressure PL, the output signal of the inhibitor switch 45 to detect the position of the select lever, the output of the brake fluid pressure sensor 46 to detect the brake fluid pressure A signal, an output signal of the acceleration sensor 47 for detecting the acceleration of the vehicle, and the like are input.

  The hydraulic control circuit 11 includes a plurality of flow paths and a plurality of hydraulic control valves. The hydraulic control circuit 11 controls a plurality of hydraulic control valves on the basis of the shift control signal from the controller 12 to switch the hydraulic pressure supply path, and at the same time, obtains the necessary hydraulic pressure from the hydraulic pressure generated by the mechanical oil pump 10m or the electric oil pump 10e. It is prepared and supplied to each part of the transmission 4. As a result, the gear ratio of the variator 20 and the gear position of the subtransmission mechanism 30 are changed, and the transmission 4 is shifted.

  Here, the operation of the mechanical oil pump 10m and the electric oil pump 10e will be described.

  Since the mechanical oil pump 10 m is driven by using a part of the power of the engine 1, the hydraulic pressure cannot be supplied to the hydraulic control circuit 11 while the engine 1 is stopped. Therefore, in order to ensure the hydraulic pressure while the engine is stopped, the electric oil pump 10e is driven while the engine 1 is stopped.

  That is, when the electric oil pump 10e operates, the engine 1 is stopped by the idle stop control or the coast stop control, that is, the engine 1 is in the idle stop state or the coast stop state.

  FIG. 2 is a cross-sectional view illustrating a configuration of a main part of the electric oil pump according to the first embodiment.

  The electric oil pump 10e includes a drive shaft 51 driven by a motor (not shown), a substantially cylindrical rotor 53 that rotates integrally with the drive shaft 51, and a substantially elliptical shape that surrounds the rotor 53 from the outside of the outer peripheral surface 53a. A plurality of (10 in the figure) plate-like vanes 52 and the rotor 53 provided so as to protrude from the outer peripheral surface 53a of the cylinder 59 and the rotor 53 toward the inner peripheral surface 59a of the cylinder 59. And a two-divided oil pump housing 54 fixed so as to block both end faces of the cylinder 59.

The cylinder 59 has a pair of suction ports 55 and a pair of discharge ports 56 formed therein.
The pair of suction ports 55 communicates with an oil pan 63 filled with oil by suction passages 57 and 57a formed in the oil pump housing 54 and the transmission housing 60, and when the electric oil pump 10e is operated, the suction port 55 Oil can be sucked into.
The pair of discharge ports 56 is also compressed by the hydraulic control circuit 11 disposed in the oil pan 63 via the check valve 62 by the discharge passages 58 and 58 a formed in the oil pump housing 54 and the transmission housing 60. Oil is supplied.

Here, the communication portion 57b of the suction passage 57 formed in the oil pump housing 54 communicating with the pair of suction ports 55 and the cylinder 59 is directed in the direction of gravity (upper and lower in the drawing) from the pair of suction ports 55 formed in the cylinder 59. Direction).
Further, a communication portion 58 b of the discharge path 58 formed in the oil pump housing 54 communicating with the discharge port 56 and the cylinder 59 is a horizontal line P passing through the center of the drive shaft 51 of the pair of discharge ports 56 formed in the cylinder 59. It is arranged above the one discharge port 56 below the gravitational direction (the vertical direction in the figure).
That is, the communicating portion 57 b of the suction passage 57 formed in the oil pump housing 54 with the cylinder 59 and the communicating portion 58 b of the discharge passage 58 with the cylinder 59 are in the direction of gravity (in the figure) with respect to the horizontal line P passing through the center of the drive shaft 51. One suction port and one discharge port are formed below the horizontal line P that is formed above (vertical direction) and passes through the center of the drive shaft 51 in the gravity direction (vertical direction in the figure).
Next, the function and effect will be described.
The electric oil pump according to the first embodiment has the following effects.

(1) The communicating portion 57b of the oil suction passage 57 communicating with the pair of suction ports 55 and the cylinder 59 is arranged above the suction port 55 in the gravity direction.
Therefore, even when the electric oil pump 10e is stopped, the backflow of oil from the pair of suction ports 55 can be suppressed, and the pair of suction ports 55 and the outer peripheral surface of the rotor 53 communicating with the suction ports 55 and the pair of Oil is sufficiently stored in the internal space of the electric oil pump 10e constituted by the vane 52 and the inner peripheral surface 59a of the cylinder 59, and the suction performance immediately after the electric oil pump 10e is started can be improved.

(2) Further, the communicating portion 58 b of the oil discharge passage 58 communicating with one discharge port 56 and the cylinder 59 is disposed above the one discharge port 56 in the gravity direction.
Therefore, even when the electric oil pump 10e is stopped, the backflow of oil from the one discharge port 56 can be suppressed, and the outer peripheral surface of the rotor 53 communicating with the one discharge port 56 and the discharge port 56 and a pair of Oil is sufficiently stored in the internal space of the electric oil pump 10e constituted by the vane 52 and the inner peripheral surface 59a of the cylinder 59, and the discharge performance immediately after the electric oil pump 10e is started can be improved.

(3) Further, the check valve 62 is arranged in the oil discharge passage 58 a communicating with the pair of discharge ports 56.
Therefore, even when the electric oil pump 10e is stopped, the backflow of oil below the set pressure from the pair of discharge ports 56 can be suppressed, and the oil is stored in the discharge passages 58 and 58a. The discharge performance immediately after the start of 10e can be further improved.

(4) Further, each has a pair of suction ports 55 and a pair of discharge ports 56, and one suction port 55 and one discharge port 56 are in the direction of gravity with respect to a horizontal line P passing through the center of the drive shaft 51 of the vane 52. (A vertical direction in the figure) A communication portion 57b of the suction passage 57 with the cylinder 59 and a communication portion 58b of the discharge passage 58 with the cylinder 59 are located from a horizontal line P passing through the center of the drive shaft 51 of the vane 52. Is also positioned above the gravitational direction (vertical direction in the figure).
Therefore, even when the electric oil pump 10e is stopped, the backflow of oil from the one suction port 55 and the one discharge port 56 can be suppressed, and the suction and discharge performance immediately after the start of the electric oil pump 10e is further improved. be able to.

[Other embodiments]
As mentioned above, although the form for implementing this invention was demonstrated based on the Example, the concrete structure of this invention is not limited to the structure shown in the Example, and is the range which does not deviate from the summary of invention. Any design changes are included in the present invention.
For example, although the electric oil pump has been described in the first embodiment, it can be applied to an oil pump driven by an engine. That is, it is possible to improve the suction and discharge performance of the oil pump by driving the engine when the engine is restarted at idle stop.
In the first embodiment, the oil pump mounted on the transmission is described. However, the present invention is not limited to this, and the present invention can also be applied to an oil pump as a hydraulic pressure generation source such as a brake pressure.

10e Electric oil pump 51 Drive shaft 52 Vane 53 Rotor (pump element)
53a Outer peripheral surface 54 Oil pump housing 55 Suction port 56 Discharge port 57 Suction passage 57a Suction passage 57b Communication portion 58 Discharge passage 58a Discharge passage 58b Communication portion 59 Cylinder 59a Inner peripheral surface P Horizontal line

Claims (4)

In an oil pump provided with a suction port and a discharge port in a cylinder that houses a pump element that pumps by rotation,
The communicating portion with the cylinder of the suction path communicating with the suction port is disposed above the suction port in the gravity direction.
An oil pump characterized by that. The oil pump according to claim 1, wherein
The communicating portion of the discharge passage communicating with the discharge port with the cylinder is disposed above the discharge port in the gravity direction.
An oil pump characterized by that. The oil pump according to claim 2,
A check valve is arranged in the oil discharge path,
An oil pump characterized by that. In the oil pump according to claims 2 to 3,
The oil pump is a pressure balanced vane pump,
It has a pair of suction ports and a pair of discharge ports,
One suction port and one discharge port are located below the horizontal line passing through the center of the drive shaft of the vane in the direction of gravity,
The oil pump, wherein the communicating portion with the cylinder of the suction passage and the communicating portion with the cylinder of the discharge passage are located above the horizontal line P passing through the center of the drive shaft of the vane.

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