JPH01110819A - Engine oil feeding device - Google Patents

Abstract

PURPOSE:To increase the oil feeding quantity in low revolution by adding the discharge oil from a subpump for sending oil under pressure into an oil cooler, into the discharged oil supplied from a main pump for feeding the oil into an oil gallery in the low revolution state. CONSTITUTION:A main pump 2 sucks the oil in an oil pan 1 through a strainer 6 and a suction passage 7, and supplies said oil into an oil gallery through a discharge oil passage 8. A selector valve 16 operated according to the discharge pressure of the main pump 2 which is supplied from a pilot oil passage 24 is installed in the first oil passage 11 which communicates to the discharge port of a subpump 4. In case of the low discharge pressure, the selector valve 16 allows communication of the second outlet port 23 which communicates with the discharge passage 8 of the main pump 2, and in case of the high discharge pressure, the selector valve 16 allows the communication of the first outlet port 22 which communicates with an oil cooler 3.

Description

Detailed Description of the Invention A0 Objective of the Invention (1) Industrial Field of Application The present invention relates to a main pump interlockingly connected to an engine for supplying engine oil in an oil pan to an oil gear gallery, and The present invention relates to an engine oil supply device including a sub-pump operatively connected to an engine to force-feed oil to an oil cooler.

(2) Prior Art Conventionally, such a device is known, for example, from Japanese Utility Model Publication No. 56-42403.

(3) Problems to be Solved by the Invention By the way, in such an engine oil supply device, in order to suppress wear of the cam slipper in the valve train to which engine oil is supplied via the oil gear rally, it is necessary to Increased engine oil supply amount,
In addition, it is important to shorten the time without lubrication when starting the engine, and for this reason conventional methods have been used to increase the discharge capacity of the main pump or reduce the volume of the oil passages in the engine to shorten the time when the oil supply system is filled. It is being considered that

However, when the discharge amount of the main pump is increased, the power consumption of the main pump increases, which adversely affects fuel efficiency and performance. In other words, the discharge capacity of the main pump is determined by ensuring the amount of oil in the valve train at low engine speeds and by ensuring the amount of oil in the connecting rod.
This was decided based on two points: securing the oil pressure supplied to the main bearing, and since the main pump is interlocked with the engine and the relationship between the discharge amount and engine speed is almost linear, it is necessary when the engine rotates at high speeds. Oil exceeding the amount of oil is discharged, and a portion of the discharged oil is returned to the oil pan via the relief valve. Furthermore, if the volume of the oil passage or the like is reduced, the flow resistance in the oil passage becomes large, causing problems such as the occurrence of cavity sag and a decrease in the supplied hydraulic pressure.

Therefore, when the engine speed is low, we use a switching valve that supplies the oil discharged from the sub-pump to the oil gear along with the main pump, and when the engine speed increases, the oil discharged from the sub-pump is switched to be supplied to the oil cooler. The applicant has already proposed a device in which the sub-pump is connected to the discharge oil path in order to prevent an extreme drop in the amount of oil supplied to the oil gear when the switching valve is switched. The switching valve is configured such that the sub-pump has an intermediate position between a position where the sub-pump communicates with the discharge oil passage and a position where the sub-pump communicates with the oil cooler.

However, the switching valve may become stuck or locked due to foreign objects getting caught or abnormal wear. In this case, if the sub-pump becomes inoperable while communicating with both the discharge oil passage and the oil cooler, engine oil will flow from the main pump to the oil cooler as well, since the passage resistance is lower on the oil cooler side, and the engine oil supply will increase. is in short supply. In order to solve such a problem, it is conceivable to use a complete flow path switching type switching valve that shuts off the sub-pump, the discharge oil passage, and the first oil passage in an intermediate state. However, in such a completely switching type switching valve, the first oil passage is temporarily completely closed when the switching operation is performed, and the oil pressure in the first oil passage increases abnormally. When the sub-pump is left in communication with the discharge oil passage and becomes inactive, engine oil does not flow to the oil cooler side, causing the oil temperature to rise, but depending on the environmental and operating conditions, problems such as metal seizure may occur on the engine side. may not necessarily occur immediately.

This also occurs when the switching valve is inoperative with the sub pump connected to the oil cooler, resulting in insufficient engine oil supply to the discharge oil path in the low rotation range, causing a problem on the engine side. Although this will not occur immediately, abnormal pressure increases in the discharge oil passage and the second oil passage must be avoided.

In view of the above-mentioned circumstances, the first object of the present invention is to switch and supply oil discharged from a sub-pump to a discharge oil passage and an oil cooler according to the engine speed, and to supply oil to a discharge oil passage and an oil cooler in accordance with the engine rotation speed, and to supply oil to a discharge oil passage and an oil cooler when the switching valve becomes inoperable for some reason. To provide an engine oil supply device that reliably prevents oil discharged from a main pump from flowing into an oil cooler even when the oil is used, and also prevents abnormal pressure rise in each oil passage.

By the way, when the switching valve becomes inoperative as described above, the problem at hand can be solved by the first invention, but it is necessary to promptly improve the operating situation, and for that purpose It is necessary to signal that the valve is inactive.

Accordingly, a second object of the present invention is to provide an engine oil supply device that not only achieves the first object but also can quickly notify that the switching valve is in an inoperative state.

B0 Structure of the Invention (1) Means for Solving Problems The device according to the present invention of cylinder 1 has a first oil passage leading to the discharge port of the sub-pump, a second oil passage leading to the inlet of the oil cooler, and a main pump. a switching valve interposed between a discharge oil passage leading to a discharge port; and a relief valve connected to each of a first oil passage, a second oil passage, and a discharge oil passage, the switching valve comprising: The first oil passage and the discharge oil passage are communicated with each other.
A low engine rotation state in which the oil passage and the second oil passage are cut off and an engine high rotation state in which the first oil passage and the second oil passage are communicated and the first oil passage and the discharge oil passage are cut off are defined as the first oil passage and the second oil passage. The oil passage is configured to be switched through a blocking state in which communication with the second oil passage and the discharge oil passage is cut off.

In addition to the configuration of the first invention, the apparatus according to the second invention includes an alarm that activates an alarm when at least one of the temperature and oil pressure of the engine oil becomes abnormal.

(2) Effect According to the configuration of the first invention, the oil discharged from the sub-pump is added to the oil discharged from the main pump when the engine is running at low speeds. The switching valve can increase the amount of engine oil supplied when the engine is in a low rotational speed state and a high engine rotational speed state. Since the switching is performed depending on the state, it is possible to reliably prevent the oil discharged from the main pump from flowing into the oil cooler. Furthermore, since a relief valve is connected to each oil passage, the oil pressure in each oil passage does not rise abnormally.

Further, according to the configuration of the second invention, in addition to achieving the first object, the switching valve is in an inactive state due to at least one of the oil pressure and oil temperature becoming abnormal when the switching valve is inactive. This makes it possible to issue an alarm using an alarm device.

(3) Embodiment Below, an embodiment of the present invention will be explained with reference to the drawings. First, in FIG. It has a large-capacity main pump 2 and a relatively small-capacity sub-pump 4 mainly for pumping the engine oil in the oil pan 1 to an oil cooler 3, cooling it, and returning it to the oil pan 1.
and the sub-pump 4 are driven by a common drive shaft 5 that is linked to a crankshaft (not shown). Therefore, the discharge amount of the main pump 2 and the sub pump 4 increases as the engine speed increases.

A suction port of the main pump 2 is connected to a suction oil passage 7 leading into the oil pan 1 via a strainer 6, and a discharge port is connected to a discharge oil passage 8 leading to an oil gear gallery. Moreover, the distance between the discharge port and the suction port of the main pump 2 is, for example, 6
．． It is connected via a relief valve 9 that opens at a pressure of 2 kg/d. Further, the suction port of the sub pump 4 is connected to the suction oil passage 7.
, and the discharge port of this sub pump 4 has a first
Oil passage 11 is connected. A relief valve 10 that opens at a pressure of, for example, 6.2 kg/cd is connected to the first oil passage 11. A second oil passage 12 is connected to the inlet of the oil cooler 3. For example, a 3 kg
A relief valve 15 that opens at a pressure of /ai is connected.

Further, the outlet of the oil cooler 3 is connected to the suction oil passage 7 via a return oil passage 13.

Between the discharge port of the main pump 2 and the oil gear rally, that is, the discharge oil passage 8, and between the discharge mouth of the sub pump 4 and the oil cooler 3, that is, between the first and second oil passages 11 and 12. is supplied to the discharge oil passage 8, and when the engine is running at high speeds, the discharge oil of the sub-pump 4 is supplied only to the oil cooler 3.
connected via.

Referring also to FIG. 2, this switching valve 16 includes a cylinder body 17, a plunger member 18 fitted into the cylinder body 17 so as to be movable in the axial direction, one axial end of the plunger 18, and a cylinder body 18. A pilot hydraulic chamber 19 defined between the body 17 and a plunger 18 to urge the plunger 18 in one direction in the axial direction against the hydraulic pressure of the pilot hydraulic chamber 19.
and a return spring 20 compressed between the other axial end of the cylinder body 17 and the cylinder body 17.

The cylinder body 17 includes an inlet port 21 communicating with the first oil passage 11, a first exit port 22 communicating with the second oil passage 12,
A second discharge robot 23 communicating with the discharge oil passage 8 is provided,
Entrance boat 2 between the first and second exit boats 22 and 23
1 is placed. Further, the pilot hydraulic chamber 1B is connected to the discharge oil passage 8 via a pilot oil passage 24.

The plunger 18 is provided with an annular groove 25, and the plunger 18 has a rightward movement position (the position shown in the first figure) where the entry port 21 and the second exit port 23 are communicated via the annular groove 25, and an annular groove 25. It is movable between a leftward movement position that communicates between the entrance boat 21 and the first exit boat 22 via the groove 25.

Moreover, the axial length Ll of the annular groove 25 is
The length L2 between the outlet ports 22 and 23 is set smaller than the length L2 between the inlet port 21 and the first and second outlet ports 22 when the plunger 18 moves between its rightward and leftward positions. Completely cut off between ゜23 and ゜23.

Also, the set load of the return spring 20 is
9, that is, the oil pressure P0 of the discharge oil passage 8 is the first set pressure P.
, for example, when it is less than 2.1 kg/cd (P, <P
I-2, 1kg/c+1), the plunger 18 is in the rightward movement position, and the oil pressure P0 is the second set pressure P.

In the above case (P, ≧P), the plunger 18 is set to the leftward movement position. Here, the second set pressure P2 is determined based on the following equation.

P, -2,1+ -L3/S In this equation, k is the spring constant of the return spring 20, and L3 is the spring constant of the return spring 20, and L3 is the spring constant of the return spring 20, and L3 is the The necessary seal length is determined to be, for example, two or less seals, and S is the pressure receiving area of the plunger 18 facing the pilot hydraulic chamber 19.

In this switching valve 16, the plunger 18 is operated according to the oil pressure in the pilot oil pressure chamber 19, that is, the oil pressure P in the discharge oil passage 8.

increases in accordance with the engine speed until the relief valve 9 opens. Therefore, the switching valve 16 also operates according to the engine speed.

An oil pressure detector 26 is attached in the middle of the discharge oil path 8 , and a detection signal from this oil pressure detector 26 is input to a control circuit 27 . Further, an oil temperature detector 28 is attached to the oil pan 1, and the detection signal of this oil temperature detector 28 is also sent to the control circuit 2.
7 is input. Further, a signal from an engine rotation speed detector 29 is also input to the control circuit 27 .

Furthermore, an alarm device 30 such as a lamp or a buzzer is connected to the control circuit circuit 27, and the alarm operation of the alarm device 30 is controlled by the control circuit 27. That is, in the control circuit 27, when the temperature detected by the oil temperature detector 28 exceeds the set value and when the oil pressure detected by the oil pressure detector 26 does not reach the oil pressure preset according to the engine speed, In either case, the alarm device 30 is controlled to activate the alarm.

Next, to explain the operation of this embodiment, first, when the engine speed is low such as when starting the engine or idling, that is, until the discharge oil pressure P reaches the engine speed at which the first set pressure P1 is reached, the Figures 1 and 2 (a)
As shown in , the plunger 18 of the switching valve 16 is in the rightward movement position. In this state, the inlet boat 21 is in communication with the second outlet boat 23, and the entire amount of oil discharged from the sub-pump 4 is supplied to the discharge oil passage 8 via the switching valve 16. Therefore, when the engine speed is low, such as when starting the engine or idling, the amount of oil required by the engine is supplied to the oil gear from the main pump 2 and sub pump 4, which reduces the amount of lubricating oil to the valve train. In addition to increasing the amount of lubrication, the non-lubricating time can be shortened, and this can contribute to preventing wear of the cam slipper.

When the oil pressure P in the discharge oil passage 8 exceeds the first set pressure P due to an increase in engine speed, as shown in FIG. 2(b),
The plunger 18 starts to move from its rightward movement position to its leftward movement position, and when the oil pressure P further increases, the artificial boat 21 and the first and second exit boats 22, 23, as shown in FIG. 2(C). In this state, the oil discharged from the sub-pump 4 is not supplied to either the discharge oil passage 8 or the second oil passage 12.

When the engine speed increases further and becomes P, ≧Pyo,
As shown in FIG. 2(d), the plunger 18 of the switching valve 16
is in the left movement position, and the entrance boat 21 is in the first exit robot 2 position.
It connects to 2. Therefore, the entire amount of oil discharged from the sub pump 4 is supplied to the oil cooler 3, and the oil pressure and oil amount in the discharge oil passage 8 increase as the rotation speed of the main pump 2 increases in accordance with the engine rotation speed. do. When the oil pressure in the discharge oil passage 8 exceeds the set pressure of the relief valve 9, for example, 6.2 kg/c4, the relief valve 9 opens, so the oil pressure in the discharge oil passage 8 increases even though the engine speed increases. It becomes constant. Moreover, since the relief valve 15 opens when the oil pressure in the second oil passage 12 exceeds the set pressure of the relief valve 15, for example, 3 kg/d, application of excessive oil pressure to the oil cooler 3 can be avoided.

Now, assume that the switching valve 16 becomes inoperable due to abnormal wear of its plunger 18, sticking, or the like. First, as shown in Figure 2 (a), during the plunge 18
If the sub-pump 4 becomes inactive while it is in the right-hand position, the entire amount of oil discharged from the sub-pump 4 will flow into the discharge oil passage 8 and will not flow into the oil cooler 3, so that the temperature of the engine oil will rise. In such a state, depending on the operating conditions, serious problems such as metal seizure in the engine may not necessarily occur, but the alarm 30 may be activated if the detected value of the oil temperature detector 28 exceeds a predetermined value. , it is possible to notify that the switching valve 16 is in an inoperative state, and to encourage improvement of the operating situation, such as avoiding high rotation and high output operation of the engine. Moreover, the oil pressure in the discharge oil passage 8 is the relief valve 9.
Since the relief valve 9 opens in response to the setting value being exceeded, an abnormal pressure increase in the discharge oil passage 8 is avoided.

Further, as shown in FIG. 2(d), if the switching valve 16 becomes inactive with the plunger 18 in the leftward movement position, the discharge oil of the sub-pump 4 flows into the discharge oil passage 8 when the engine speed is low. This will cause a shortage of engine oil on the engine side, but even in this state, no serious problem will occur immediately, and the detected value by the oil pressure detector 26 will be smaller than the predetermined value, so the alarm 30 will be activated. is activated to encourage improvements in driving conditions.

Further, as shown in FIG. 2(C), when the plunger 18 is at the intermediate position between the rightward movement position and the leftward movement position, the switching valve 1
6 is in an inactive state. In this case, the inlet boat 21 does not communicate with both the first and second outlet boats 22, 23, and the oil discharged from the main pump 2 is prevented from flowing to the oil cooler 3 side. Therefore, there is no possibility that the amount of oil supplied from the discharge oil passage 8 to the oil gear gallery becomes too small, causing engine trouble. Moreover, when the inlet boat 21 and the first and second outlet boats 22 and 23 are cut off in this way, the oil pressure in the first oil passage 11 increases, but the oil pressure exceeds the set pressure of the relief valve 10. In this case, the relief valve 10 opens, thereby preventing the oil pressure in the first oil passage 11 from increasing abnormally. Also, at this time, the alarm 30 activates an alarm in response to the oil temperature of the oil pan 1 rising above the set value, thereby notifying that the switching valve 16 is in the inoperative state.

As another embodiment of the present invention, a hydraulic pressure detector is provided in the second oil passage 12, and the alarm 30 is activated in response to detecting the hydraulic pressure in a low-speed operating range where the switching valve 16 should be in the right-hand position. You may also force them to do so.

C1 Effects of the Invention As described above, the first inventive device has a first oil passage leading to the discharge port of the sub-pump and a second oil passage leading to the inlet of the oil cooler.
a switching valve interposed between the oil passage and a discharge oil passage leading to a discharge port of the main pump; and a relief valve connected to each of the first oil passage, the second oil passage, and the discharge oil passage; , the switching valve communicates between the first oil passage and the second oil passage and communicates with the engine low rotation state where the first oil passage and the discharge oil passage are communicated and the first oil passage and the second oil passage are cut off. 1
The main pump It is possible to increase the amount of engine oil supplied at low engine speeds without increasing the set discharge amount of the main pump, and to reliably prevent the oil discharged from the main pump from flowing to the oil cooler. It is possible to reliably avoid an abnormal increase in the oil pressure in the oil passage.

In addition to the configuration of the first device of the present invention, the second device of the present invention includes an alarm that activates an alarm when at least one of the temperature and oil pressure of the engine oil becomes abnormal. In addition to achieving the effects of invention 1,
It is possible to notify that the switching valve is in an inoperative state and encourage improvement of the operating situation.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a hydraulic circuit diagram, and FIG. 2 is an enlarged longitudinal sectional view sequentially showing the operating states of the switching valve.

Claims (2)

[Claims] (1) An engine that includes a main pump that is interlocked with the engine to supply the engine oil in the oil pan to the oil gallery, and a sub pump that is interlocked and connected to the engine to pump the engine oil in the oil pan to the oil cooler. In the oil supply device, a first oil passage leads to the discharge port of the sub-pump, and a second oil passage leads to the inlet of the oil cooler.
a switching valve interposed between the oil passage and a discharge oil passage leading to a discharge port of the main pump; and a relief valve connected to each of the first oil passage, the second oil passage, and the discharge oil passage; , the switching valve connects the first oil passage and the discharge oil passage to a low engine speed state and disconnects the first oil passage and the second oil passage from each other. 1
The engine is characterized in that it is configured to switch between a high engine speed state in which communication between the oil passage and the discharge oil passage is cut off, and a cutoff state in which communication between the first oil passage and the second oil passage and the discharge oil passage is cut off. Engine oil supply device. (2) An engine that includes a main pump that is interlocked to the engine to supply the engine oil in the oil pan to the oil gallery, and a sub pump that is interlocked to the engine to pump the engine oil in the oil pan to the oil cooler. In the oil supply device, a first oil passage leads to the discharge port of the sub-pump, and a second oil passage leads to the inlet of the oil cooler.
a switching valve interposed between the oil passage and the discharge oil passage leading to the discharge port of the main pump; a relief valve connected to the first oil passage, the second oil passage and the discharge oil passage, respectively; an alarm that activates an alarm when at least one of oil temperature and oil pressure becomes abnormal; Engine low rotation state and the first
A high engine speed state in which the oil passage and the second oil passage are communicated with each other and a connection between the first oil passage and the discharge oil passage is cut off, and a cutoff is made in which communication between the first oil passage and the second oil passage and the discharge oil passage is cut off. An engine oil supply device configured to switch between states.