JP3122348B2 - Engine lubrication oil supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine lubricating oil supply device for supplying lubricating oil for engine lubrication, and more particularly to an engine lubricating oil supply device for reducing an engine load.

[0002]

2. Description of the Related Art The specification of an oil pump (gear pump) for supplying lubricating oil (engine oil) to an engine is limited to the minimum engine speed, that is, the engine must be lubricated even when the engine is running at a low speed. The discharge pressure and the discharge oil amount are determined based on the number of revolutions in idling.

On the other hand, a gear pump for engine lubrication rotates in proportion to the engine speed, and the amount of lubricating oil discharged from the gear pump is proportional to the speed of the gear pump. However, the amount of oil required when the engine speed is high does not increase in proportion to the rotation speed of the gear pump. Occurs, increasing the load on the engine. In addition, if the discharge amount of the gear pump is adjusted to the amount of lubricating oil required when the engine is running at a high speed, the amount of lubricating oil during idling becomes insufficient.

[0004] Therefore, the present applicant has devised a gear pump having a metering circuit for reducing the engine load without performing extra lubrication work. This gear pump is used in actual open flat 1-7.
As disclosed in Japanese Patent No. 8282, two sets of gear pumps formed by three gears arranged in a row in one casing are provided, and a discharge circuit of one gear pump is provided with a bypass circuit, and the bypass circuit is provided in the bypass circuit. A metering valve that opens and closes when the lubricating oil temperature rises and the lubricating oil pressure rises. By continuously bypassing (relief) the discharge of one gear pump based on the lubricating oil temperature and pressure, the engine load is reduced. Has been reduced.

[0005]

However, in the gear pump configured as described above, when the lubricating oil reaches a predetermined temperature and a predetermined pressure or more, all of the lubricating oil discharged from one gear pump is bypassed. You. For this reason,
The engine is lubricated only by the lubricating oil discharged from the other gear pumps. Will be supplied.

That is, as shown in FIG. 3, when the specifications of the pump are set so as to have a hydraulic pressure a that satisfies a discharge hydraulic pressure A corresponding to a required oil amount during idling of the engine, the engine speed N ( As the number of revolutions of the pump increases, the bypass amount of the lubricating oil discharged from one gear pump increases, and from the point d where the entire amount is bypassed, the increase of the discharge hydraulic pressure with respect to the increase of the rotational speed N as indicated by the broken line The amount increases.

For this reason, a discharge oil pressure higher than the oil pressure that satisfies the discharge oil pressure B corresponding to the required oil amount at the time of rated rotation of the engine is generated. Here, assuming that the pump drive torque is T, the oil amount is Q, the oil pressure is P, and the pump efficiency is η, T = QP / 2
The relationship πη holds. That is, when the hydraulic pressure P increases, the torque T required for driving the pump increases, and there is a problem that the loss of the engine output increases accordingly.
Further, since two sets of gear pumps are formed by three gears, there is a problem that the configuration of the oil pump is complicated.

The present invention has been made in view of such a problem, and it is an object of the present invention to unnecessarily increase a driving torque for driving an oil pump for lubricating an engine even at a high engine speed. The aim is to provide no engine lubrication oil supply.

[0009]

In order to achieve the above object, an engine lubricating oil supply device according to the present invention comprises:
An oil pump for supplying lubricating oil to the engine is driven in conjunction with the engine. Then, the engine speed is detected by the engine speed detecting means, the oil pressure discharged from the oil pump is detected by the oil pressure detecting means, and the oil pressure detected by the oil pressure detecting means is detected by the engine speed detected by the engine speed detecting means. Causes the controller to transmit a relief signal when the set oil pressure exceeds the set oil pressure. The oil amount adjustment valve that receives the relief signal drains a part of the lubricating oil supplied from the oil pump to the engine.

Further, in this engine lubricating oil supply device, the oil amount adjusting valve in the engine lubricating oil supply device includes:
It comprises an on-off valve and a control valve. Here, the on-off valve is
A piston valve for opening and closing a drain oil passage for draining lubricating oil, and an urging means for urging the piston valve toward an open position for opening the drain oil passage, the piston valve comprising When the oil pressure of the lubricating oil is received on the front surface, it is configured to be pressed to the open side. The piston valve is provided with an orifice for communicating the front side and the back side. Further, the amount of drainage of the lubricating oil flowing into the rear side through the orifice is controlled by the control valve.

According to such an engine lubricating oil supply device, the oil pump is driven in conjunction with the engine. Therefore, as the engine speed increases, the amount of hydraulic oil discharged from the oil pump increases. Generally, the discharge oil pressure also increases as the discharge oil amount increases. Here, the required amount of lubricating oil is determined in advance corresponding to the engine speed, and the discharge oil pressure corresponding to the amount of oil is also determined.

In the engine lubricating oil supply device according to the present invention, when the discharge hydraulic pressure exceeds the set hydraulic pressure corresponding to the required lubricating oil amount, a part of the lubricating oil is drained from the oil amount adjusting valve by the relief signal from the controller. Then, control is performed to maintain the discharge oil pressure at the set oil pressure. As a result, the required oil amount is always secured as the amount of lubricating oil to the engine, and the pump discharge pressure can be made as low as possible, and the driving force of the oil pump can be reduced.

[0013] In the engine lubricating oil supply device according to the present invention, the oil amount adjusting valve further comprises an on-off valve and a control valve. According to such an oil amount adjusting valve, the operation of the control valve is controlled. When the lubricating oil is drained, the on-off valve opens due to the balance between the pressure difference between the front and back sides of the piston valve member generated according to the flow of the lubricating oil passing through the orifice and the urging force of the urging means. Since the degree can be adjusted, the drain amount can be appropriately adjusted with a simple configuration.

In the engine lubricating oil supply device configured as described above, when the temperature of the lubricating oil decreases, the viscosity of the lubricating oil increases and the hydraulic pressure increases.
If the above control is performed at the same set oil pressure as when the temperature of the lubricating oil is high when the temperature of the lubricating oil is low, the amount of the lubricating oil will be insufficient. Therefore, oil temperature detecting means for detecting the temperature of the lubricating oil is provided, and when the detected value detected by the oil temperature detecting means is equal to or lower than a predetermined oil temperature, the set oil pressure is increased by the set oil pressure increasing means. It is desirable to increase the amount by a fixed amount so as to secure an oil amount necessary for lubrication.

Thus, when the oil temperature is low, the set value of the hydraulic pressure at which the controller transmits the relief signal increases, so that the amount of the lubricating oil supplied to the engine does not become insufficient.

It is preferable that the control valve in the oil amount adjusting valve is constituted by an electromagnetic valve which performs duty ratio control. With such a configuration, the opening degree of the on-off valve can be accurately and finely controlled, so that the flow rate of the lubricating oil passing through the orifice can be accurately and finely controlled. Adjustments can be made precisely and precisely.

[0017]

Preferred embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an engine lubricating oil supply device 1 according to the present invention. The engine lubricating oil supply device 1 includes an oil amount adjustment valve 10, a gear pump 20, and a controller (ECU) 30.

First, the gear pump 20 will be described.
The gear pump 20 includes a casing 21, two gears 22, 22 circumscribed and disposed in the casing,
An intake port 23 extends from the casing 21 and connects to an oil pan (oil tank) (not shown), and a discharge port 24 extends from the casing 21 and connects to an engine (not shown). One of the rotating shafts of the gears 22, 22 is connected to the output shaft of the engine, and rotates in the direction of the arrow as the engine rotates.

According to the gear pump 20 configured as described above, the gears 22, 22 are rotated by driving the engine, and the lubricating oil in the oil pan T is sucked from the suction hole 23 as shown by the arrow O. The sucked lubricating oil O is sent to the engine through the discharge hole 24. A relief hole 25 is formed on a side surface of the discharge hole 24, and the oil amount adjustment valve 10 is connected to the relief hole 25.

The oil amount adjusting valve 10 includes an on-off valve 11 connected to the relief hole 25 and a control valve (solenoid valve) 16 connected to the on-off valve 11. On-off valve 11
The front surface 12a is configured to be movable in the direction approaching and away from the relief hole 25 (in the left-right direction in FIGS. 1 and 2) by the biasing force of the spring 13 so that the front surface 12a is always in the relief hole 25 (left end). A piston 12 biased toward the closed position is disposed.

A drain oil passage 14 connected to the oil pan T is formed on a side surface of the on-off valve 11. Drain oil passage 14
Is closed by the outer peripheral surface of the piston 12 in the closed position.

An orifice 12b is formed on the front surface 12a of the piston 12. The orifice 12b allows the relief hole (piston front space) 25 to always communicate with the back space 11a of the on-off valve 11. A connection oil passage 15 is formed at the right end of the oil amount adjustment valve 10 and is connected to a control valve 16 described in detail later. In addition, connection oilway 1
5 is normally closed by the action of the control valve 16.

In the oil amount adjusting valve 10 configured as described above, when the engine speed N increases, the gear pump 2
Since the number of revolutions of 0 also increases, the flow rate of the lubricating oil supplied to the engine increases, and the discharge hydraulic pressure P also increases. For this reason,
By detecting the oil pressure P, the corresponding oil amount can be almost detected.

Here, the lubricating oil O necessary for lubricating the engine is
Is not necessarily proportional to the engine speed N (the speed of the gear pump 20). Specifically, the oil pressure P corresponding to the flow rate of the lubricating oil O required for lubrication is, as shown by a point A in FIG.
m (at the time of idling), it is about 0.30 MPa, and as shown by the point B, when the rotation speed N is about 2200 rpm (at the time of rated rotation), it is about 0.70 MPa, as shown by the point C. When the rotation speed N is about 2700 rpm (at the time of maximum rotation), it is about 0.75 MPa.

For example, when the gear pump 20 having a hydraulic pressure P of 0.30 MPa when the engine is idle is used, if the engine is to be rotated at rated speed and the entire amount of lubricating oil is supplied to the engine, the chain line in FIG. As shown, the hydraulic pressure P rises to about 1.55 MPa.

However, the hydraulic pressure P actually required at the time of rated rotation of the engine is 0.70 MPa as described above, and the driving torque of the gear pump 20 required to generate the difference hydraulic pressure is equal to the loss of engine output. Become.

For this reason, the oil amount adjusting valve 10 detects the engine speed N and the oil pressure P, and stores an appropriate oil pressure (set oil pressure) corresponding to the engine speed N in the controller 30. When the detected value of the oil pressure at the engine speed is equal to or higher than the set oil pressure, a part of the lubricating oil O supplied from the gear pump 20 is transferred to the drain oil passage 14.
Through the oil pan T to reduce the discharge oil pressure P to the set oil pressure when the engine is running at a high speed.

The relief of the lubricating oil O is performed based on the operation of the control valve 16. The control valve 16 includes a housing 16
A ball 18 which is attracted when the solenoid 17 disposed in a is excited and moves rightward is disposed. In a non-excited state, the ball 18 is connected to the connecting oil passage 15 and closes a through hole 16b formed in the housing 16a.

When the through hole 16b is closed as described above, the lubricating oil O discharged from the gear pump 20 flows into the back space 11a through the orifice 12b.
The oil pressure in the back space 11a and the oil pressure in the relief hole 25 (the oil pressure on the front side and the back side of the piston 12) are the same. Therefore, the piston 12 is located at the closed position at the left end by the urging force of the spring 13, and the communication between the relief hole 25 and the drain oil passage 14 is blocked.
All the lubricating oil O discharged from is supplied to the engine.

In this state, if the rotation of the engine is increased (the rotation of the gear pump 20 is increased), the oil pressure P of the lubricating oil O increases, causing a loss in engine output. Lower P. For example, when the engine speed is 2200 rpm (rated speed) and the engine speed detector 31 and the oil pressure detector 32 detect that the oil pressure exceeds 0.72 MPa, the controller 30 controls the solenoid 17 And the ball 18 is moved to the right to open the through hole 16b, and the lubricating oil O in the back space 11a is supplied to the housing 16a.
Into the space 16c. The lubricating oil that has flowed in is relieved to the oil pan T from a piston operating drain oil passage 16d formed through the housing 16a.

At this time, the exciting operation of the solenoid 17 (the opening operation of the through hole 16b by the operation of the ball 18) is controlled by a duty ratio by a control signal from the controller 30. That is, by controlling the time during which the solenoid 17 is excited to open the through-hole 16b,
The flow rate of the lubricating oil flowing through the through hole 16b can be controlled, and thus the flow rate of the lubricating oil passing through the orifice 12b can be controlled.

When the lubricating oil passes through the orifice 12b,
A pressure difference occurs between the front side and the back side of the piston 12. That is, the pressure in the rear space 11 a (pressure on the rear side) is lower than the pressure in the relief hole 25 (pressure on the front side), and therefore the piston 12 resists the urging force of the spring 13.
Is pushed to the right.

Here, the rightward movement amount of the piston 12, that is, the opening area of the drain oil passage 14 increases as the pressure difference between the relief hole 25 side and the back space 11a side of the piston 12 increases. Then, a part of the lubricating oil O discharged from the gear pump 20 is relieved from the drain oil passage 14 opened by the pressure difference.

When the lubricating oil O is thus relieved, the hydraulic pressure P decreases. Then, when the hydraulic pressure P decreases to a set hydraulic pressure corresponding to the engine speed N, the controller 17 causes the solenoid 17 to be in a non-excited state. As a result, the ball 18 moves to the left to close the through hole 16b, the hydraulic pressure on the left and right sides of the piston 12 becomes the same pressure again, and the biasing force of the spring 13 causes the piston 12 to be positioned at the closed position at the left end. 14 are shielded.

That is, the opening / closing operation of the ball 18 (operation control of the control valve) by the duty ratio control from the controller 30 allows the flow rate passing through the orifice 12b to be precisely and precisely controlled. The pressure difference with the back side can also be accurately and finely controlled, and the opening area of the drain oil passage 14 can be made a desired opening area.

By performing such control so that the relationship between the engine speed N and the discharge oil pressure P becomes the relationship shown by the solid line in FIG. 0.72 MPa,
It is possible to make the oil pressure approximate to the oil pressure corresponding to the flow rate Q of the lubricating oil actually required for lubrication of the engine.

Further, as shown by B and C in FIG. 3, since the increase in the oil amount with respect to the increase in the engine speed may be small from the rated speed of the engine to the maximum speed,
The oil to be relieved so that the rate of increase of the hydraulic pressure P from near the rated rotation of the engine to the maximum rotation indicated by the point b is smaller than the rate of increase of the hydraulic pressure P from the vicinity of the idling rotation to the point b indicated by the point a. Increase the amount.

Further, in the oil amount adjusting valve 10, the timing at which the operation of the control valve 16 is controlled is controlled by the gear pump 20.
Not only based on the rotation speed N and the discharge oil pressure P, but also the oil temperature of the lubricating oil O detected by the oil temperature detector 33. That is, since the viscosity increases when the temperature of the lubricating oil O is low, the oil amount decreases when the hydraulic pressure P is the same.

Therefore, the set value of the hydraulic pressure P for operating the control valve 16 in accordance with the decrease of the oil temperature is increased by the set hydraulic pressure increasing means (not shown) provided in the controller 30.
Thus, even when the oil temperature is low, the engine is supplied with the necessary flow rate of the lubricating oil O.

Therefore, at the time of rated rotation of the engine, the discharge pressure P can be reduced by S '+ S as compared with the oil pump which does not perform the relief of the lubricating oil. Since the discharge pressure P can be reduced by the amount S in comparison with the oil pump having the oil pump, the engine load can be reduced.

In the above embodiment, the operation of the oil amount adjusting valve 10 is controlled in consideration of the oil temperature. However, in the present invention, it is not always necessary to perform the control based on the oil temperature.

Further, the configuration of the oil amount adjusting valve is not limited to the above-described configuration, and other configurations such as a motor-operated on-off valve for adjusting the amount of opening and closing of the drain oil passage in accordance with the rotation speed and the oil pressure are provided. It may be an oil amount adjustment valve. Further, the control valve in the oil amount adjustment valve does not necessarily need to be configured by an electromagnetic valve that performs duty ratio control, and may be an electrically operated valve having another configuration.

[0043]

As described above, the engine lubricating oil supply device according to the present invention provides the lubricating oil pressure supplied to the engine from the oil pump rotating in proportion to the engine speed.
Based on the temperature and the rotation speed of the oil pump, it is possible to change the amount of the lubricating oil to be relieved from the lubricating oil supplied from the oil pump to the engine. As a result, a required amount of lubricating oil according to the engine speed can be appropriately supplied, and the discharge pressure of the oil pump can be made as low as possible. By efficiently using the engine output without increasing it as necessary, energy saving of the engine can be achieved.

In the engine lubricating oil supply device according to the present invention, the oil amount adjusting valve further comprises an on-off valve and a control valve. According to such an oil amount adjusting valve, the operation of the control valve is controlled. When the lubricating oil is drained, the on-off valve opens due to the balance between the pressure difference between the front and back sides of the piston valve member generated according to the flow of the lubricating oil passing through the orifice and the urging force of the urging means. Since the degree can be adjusted, the drain amount can be appropriately adjusted with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a schematic view of an engine lubricating oil supply device according to the present invention.

FIG. 2 is a schematic diagram showing an operation state of the engine lubricating oil supply device.

FIG. 3 is a graph showing a relationship between an engine speed and a hydraulic pressure in each engine lubricating oil supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine lubricating oil supply apparatus 10 Oil amount adjustment valve 11 Open / close valve 12 Piston 13 Spring 16 Control valve 20 Gear pump

Continuing from the front page (72) Inventor Hiroteru Katayama 1-6-6 Tsukimino, Yamato-shi, Kanagawa Prefecture Inside Tokyo Parts Industry Co., Ltd. (56) References JP-A-5-1955741 (JP, A) 107424 (JP, U) JP-A-2-139307 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F01M 1/16 F01M 1/02 F04C 15/04

Claims (3)

(57) [Claims] An oil pump that is driven in conjunction with the engine and supplies lubricating oil to the engine; a rotation speed detection unit that detects a rotation speed of the engine; and a discharge oil pressure of the oil pump. A hydraulic pressure detecting means, a controller for transmitting a relief signal when a hydraulic pressure detected by the hydraulic pressure detecting means exceeds a set hydraulic pressure corresponding to the rotational speed detected by the rotational speed detecting means, An oil amount adjusting valve for draining a part of the lubricating oil supplied from the oil pump to the engine based on a relief signal, wherein the oil amount adjusting valve is configured to drain the lubricating oil. And a biasing means for biasing the piston valve toward an open position for opening the drain oil passage. An open / close valve formed on the front surface of the piston valve to receive an oil pressure of the lubricating oil, and the piston valve is formed with an orifice for communicating the front surface and the back surface; and the back surface via the orifice. A control valve for controlling a drain amount of the lubricating oil flowing into the piston valve member. The operation control of the control valve causes the front and rear sides of the piston valve member to be generated in accordance with the flow of the lubricating oil passing through the orifice. An engine lubricating oil supply device is configured to adjust the opening of the on-off valve based on the balance between the pressure difference between the open-close valve and the urging force of the urging means. An oil temperature detecting means for detecting an oil temperature of the lubricating oil; and when the detected value detected by the oil temperature detecting means is equal to or lower than a predetermined oil temperature, the oil pressure is set to a predetermined amount. 2. The engine lubricating oil supply device according to claim 1, further comprising: a set oil pressure increasing unit that increases the oil pressure. 3. The engine lubricating oil supply device according to claim 1, wherein the control valve is an electromagnetic valve that performs duty ratio control.