JPH03179177A - Oil pump device - Google Patents

Abstract

PURPOSE:To reduce the extent of power loss in a machine by installing two oil pumps being driven by an engine, and controlling them in supplying lubricating oil to be discharged out of each pump to a lubricating part via a passage selector valve being selected according to the rotational frequency of the machine such as an engine or the like. CONSTITUTION:An inlet port of a first oil pump 4 being driven by an engine is connected to an oil pan 1 by a passage 3, and a discharge port of this pump 4 is connected to a lubricating part 2 by a passage 5. In addition, the passage 3 is connected to the inlet port of a second pump 8 being driven by the engine by a passage 7, and the discharge port is connected to a first port 11 of a passage selector valve 10 by a passage 9. This passage selector valve 10 is constituted so as to install a sliding valve body 21, being energized to the upper part by a compression spring 25, in the inner side of a casing 20 and to open or close an inner passage 20 of this valve body 21 through a sphere 23. At time of low engine speed, by way of example, this sphere 23 is pushed up by a pressure differential between these first and second ports 11, 12, and then lubricating oil out of the pumps 4, 8 is made so as to be fed into the lubricating part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The oil pump device according to the present invention is used to supply lubricating oil to an engine of an automobile or the like.

(Prior Art) When operating an automobile engine, it is necessary to supply lubricating oil to each component such as a camshaft.

For this reason, conventionally, an oil pump driven by the engine has been used to suck up lubricating oil stored in an oil pan attached to the engine, pressurize this lubricating oil, and send it to various parts where lubricating oil is needed. ing.

By the way, the amount of lubricant oil discharged from the oil pump driven by the engine increases in proportion to the engine speed, whereas the amount of lubricant oil required by each part of the engine varies depending on the engine speed. In other words, when the engine speed is relatively low, the required amount of lubricating oil increases in proportion to the engine speed, but when the engine speed is above a certain value, When the amount of lubricating oil reaches j', the amount of lubricating oil hardly changes and remains almost constant.

For this reason, in the past, a pressure control valve was installed between the oil pump and each part of the engine that required lubricating oil, so that when the engine speed reached a certain value or higher, lubricating oil was released more than necessary. prevents it from being sent into the lubricating oil flow path of the engine.

(Problem to be Solved by the Invention) However, in the conventional oil pump device as described above, when the engine speed reaches a certain value or higher,
The oil pump discharges lubricating oil proportional to the rotational speed at a pressure set by the pressure control valve.

As a result, the excess amount of lubricating oil discharged from the oil pump is cut by the pressure control valve and returned to the oil pan, but the oil pump has to do extra work by the amount of this cut.

When the oil pump performs extra work in this way, it is undesirable because not only the engine output (net value) decreases, but also extra fuel is consumed.

The oil pump device of the present invention eliminates the above-mentioned disadvantages.

(Means for Solving the Problems) An oil pump device of the present invention includes an oil reservoir storing oil, a first channel having one end communicating with the oil reservoir, and the other end of the first channel. a first oil pump having a suction port communicated with the first oil pump; a second flow path having one end communicating with the discharge port of the first oil pump and the other end communicating with the inlet of a portion requiring oil; a third flow path having one end communicated with the outlet of the portion and the other end communicating with the oil sump; a fourth flow path having -1% communicated with the oil sump; A second oil pump having a suction port communicated with the other end of the passage, a fifth flow passage having one end communicating with the discharge port C of the second oil pump, and a fifth flow passage having one end communicating with the discharge port C of the second oil pump; a sixth flow path having one end communicated with the second port of the flow path switching valve and the other end communicating with the above-mentioned portion; a seventh channel having one end communicated with the third port and the other end communicating with the suction port of the second oil pump or the oil reservoir, and one end communicating with the fourth port of the channel switching valve; and a flow path to a second oil pump, the other end of which communicates with the suction port of the first oil pump or the oil reservoir.

The flow path switching valve has a first port between the first port and the second port that opens when the pressure on the first port side is higher than the pressure on the second port side. valve mechanism,
Between the first port and the third port, the pressure of the part requiring the oil or the pressure inside the second port is introduced into the flow path switching valve through the pressure introduction port. A second valve mechanism that opens when a predetermined value is reached is arranged between the second port and the fourth port to control the pressure introduced into the flow path switching valve through the pressure introduction port, or the second valve mechanism. and a third valve mechanism that opens when the pressure inside the port increases further and exceeds a certain value.

(Function) The oil pump device of the present invention configured as described above operates as follows depending on the rotational speed of a machine such as an engine that drives the first and second oil pumps.

When a machine such as an engine rotates at low speed, the second valve mechanism does not open, and the pressure at the first port of the flow path switching valve becomes higher than the pressure at the second port. The first valve mechanism is in an open state.

As a result, not only the oil discharged from the first oil pump is sent to the part that requires oil through the second flow path, but also the oil discharged from the second oil pump is sent to the fifth flow path. A sufficient amount of oil is fed into the above section through the passage, the passage switching valve, and the 60th passage.

Next, when the machine such as the engine rotates at a medium speed, as the pressure introduced from the pressure introduction port or the pressure inside the second port reaches a predetermined value, the second The valve mechanism opens in proportion to the above pressure, the pressure at the first port portion of the flow path switching valve tends to be lower than the pressure at the second port portion, and the first valve mechanism tends to close; Pressure regulation of the oil discharged by the second oil pump is started.

As a result, all or part of the oil discharged from the second oil pump passes through the 50th channel, the channel switching valve, and the 7th channel, and returns to the oil reservoir or the second oil pump. This second oil pump is driven with a small torque, preventing unnecessary power consumption.

Even in this case, since the first oil pump is driven at a sufficient speed, a sufficient amount of oil is sent to the parts that require oil.

Furthermore, when a machine such as an engine rotates at high speed, the second valve mechanism remains open, just like when it rotates at medium speed, so the pressure at the first port of the flow path switching valve decreases. is lower than the pressure in the second port section, and not only does the first valve mechanism remain closed, but also the pressure in the said section or inside the second port, which is led to the hydraulic introduction port. In response to the pressure, a third valve mechanism provided with a flow path switching valve is opened.

As a result, a portion of the oil sent out from the first oil pump passes through the sixth flow path, the second port, the third valve mechanism, the fourth port, and the flow path to the oil reservoir or It is returned to the suction port of the first oil pump, and only the amount of oil necessary to maintain the pressure in that part at a desired value is delivered to the part that requires oil.

As a result, not only is the torque required to drive the second oil pump sufficiently reduced, but the torque required to drive the first oil pump is also reduced to a certain extent, preventing unnecessary power consumption. Ru.

Even in this case, since the -th oil pump is driven at a sufficient speed, a sufficient amount of oil is sent to the parts that require oil.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

FIG. 1 is a piping diagram showing a first embodiment of the oil pump device of the present invention, and FIG. 2 is a diagram showing the relationship between the amount of oil supplied by this oil pump device and the engine speed.

In Fig. 1, 1 is an oil pan, which is an oil reservoir. Inside this oil pan 1, lubricating oil is stored to supply to the parts 2 (parts that require oil) of each part of the engine that need to be lubricated. has been done.

One end of a first flow path 3 is open at the bottom of the oil pan 1, and the other end of the first flow path 3 is connected to a first oil pump 4 which is rotationally driven by the engine crankshaft. It is connected to the intake port. Then, one end of the second flow path 5 is communicated with the discharge port of the first oil pump 4, and the other end of the second flow path 5 is communicated with the inlet of the part 2 to be lubricated, and the first oil pump is 4 is driven, the lubricating oil stored in the oil pan 1 is
The lubricant is fed into the portion 2 to be lubricated.

Then, the other end of the third flow path 6, one end of which is connected to the outlet of the portion 2 to be lubricated, is connected to the oil pan 1, and the lubricating oil that has been subjected to lubrication is returned to the oil pan 1. I'm doing it like that.

In addition, by branching one end from the middle of the No. 10 flow path 3, the other end of the fourth flow path 7 that communicates with the oil pan 1 is connected to a second flow path 7 which is also rotationally driven by the engine crankshaft. The other end of the fifth flow path 9, which is connected to the suction port of the second oil pump 8 and the other end of the fifth flow path 9 is connected to the discharge port of the second oil pump 8, is provided in the flow path switching valve 10. When the second oil pump 8 is driven by engine operation, the lubricating oil stored in the oil pan 1 passes through the first port 11 to the flow path switching valve. It is designed to be sent within 10 minutes.

Further, the other end of the sixth flow path 13, which has one end communicated with the second port 12 of the flow path switching valve 10, is connected to the middle of the second flow path 5, and the second port 12 is connected to the second flow path 5. The lubricating oil is exchanged between the flow path 5 and the second flow path 5.

Further, one end of a seventh flow path 15 is communicated with the third port 14 of the flow path switching valve 10, and this seventh flow path 1
By connecting the other end of 5 to the middle of the fourth flow path 7,
The third port 14 and the suction port of the second oil pump 8 are communicated.

Further, the other end of the flow path 17, which has one end communicated with the fourth port 16 of the flow path switching valve 10, is connected to the first flow path 3.
When the fourth port 16 is opened, the lubricating oil present in the flow path switching valve 10 is passed through the flow path 17 to the first oil pump 4. It is designed so that it can be sent to the intake port.

Further, the other end of the pressure introduction channel 18, which has one end connected to the portion 2 to be lubricated, is connected to the pressure introduction port 19 of the flow path switching valve 10 to reduce the pressure in the portion 2 to be lubricated. , is introduced into the inner end of the flow path switching valve 10.

The flow path switching valve 10 having the first to fourth ports 11, 12, 14, 16 and the pressure introduction port 19, which are connected to the ends of the flow paths as described above, has first to third ports inside. A valve mechanism is provided, and the communication state of the first to fourth ports 11, 12, 14, and 16 is switched by the operation of each valve mechanism.

First, between the first port 11 and the second port 12,
A first valve mechanism is provided that opens only when the pressure on the first port 11 side is higher than the pressure on the second port 12 side.

That is, a sliding valve body 21 is provided inside a bottomed cylindrical casing 20 constituting the flow path switching valve 10.
The inner channel 22 of 1 can be opened and closed by a sphere 23. A stepped valve seat 24 is formed in the middle of the inner flow path 22, and the sphere 23 can freely come into contact with the valve seat 24. When the pressure on the second port 12 side is higher than that of the first port, the sphere 23 separates from the valve seat 24 and the first and second ports 11 and 12 communicate with each other. When the pressure becomes higher than the pressure on the valve seat 11 side, the sphere 23 is pressed against the valve seat 24, and the communication between the first port 11 and the second port 12 is cut off.

Further, between the first port 11 and the third port 14, there is a second valve mechanism that opens before the first valve mechanism consisting of the sphere 23 and the valve seat 24 closes. has been established.

That is, a compression spring 25 is provided between the lower surface of the sliding valve body 21 and the casing 20 to constantly press the sliding valve body 21 upward. Communication ports 26 and 27 are provided at both upper and lower ends of the inner flow path 22 of the sliding valve body 21, respectively.
is formed so that the inside and outside of the inner flow passages 26 and 27 are communicated with each other. However, when the sliding valve body 21 is raised to the maximum due to the elasticity of the compression spring 25, the upper communication port 26 is opened to the second The lower communication port 27 is connected to the first port 11.
The third and fourth ports 14 and 16 are arranged so as not to face any of the communication ports.

A flange-shaped valve portion 29 is provided on the lower outer peripheral surface of the sliding valve body 21.
is the inner peripheral surface of the casing 20, and the first port 11
A stepped valve seat portion 30 is provided between the third port 14 and the third port 14.
are formed respectively, and when the sliding valve body 21 rises the most due to the elasticity of the compression spring 25, the valve portion 29 and the valve seat portion 30 come into contact with each other, and the first port 11 and the third port 14 are cut off.

On the other hand, a pressure introduction space 28 provided at the upper end of the flow path switching valve 10 and communicating with the pressure introduction port 19 faces the upper surface of the sliding valve body 21, and the portion to be lubricated 2
As the pressure increases, the pressure in this pressure introduction space 28 and the pressure inside the second port 12 communicating with the part 2 to be lubricated through the second and sixth passages 5.13 increase. In this case, the sliding valve body 21 is made to descend against the elasticity of the compression spring 25 depending on the degree of rise.
When the pressure of the portion 2 to be lubricated rises to a predetermined value or more, the sliding valve body 21 descends and the first port 11 and the third port 14 communicate with each other.

Further, between the second port 12 and the fourth port 16, the pressure introduced into the pressure introduction space 28 of the flow path switching valve 10 through the pressure introduction port 19 is lower than the predetermined value. A third valve mechanism is provided that opens when the value exceeds a large certain value.

That is, the width of the opening of the upper communication port 26 (vertical dimension in FIG. 1) is set to be sufficiently larger than the width of the partition wall 31 that partitions the second port 12 and the fourth port 16. By increasing the size, when the sliding valve body 21 is sufficiently lowered, the second port 12 and the fourth port 16 communicate with each other through the opening of the communication port 26. Mr. is doing.

To further explain the relationship between the first valve mechanism, the second valve mechanism, and the third valve mechanism, communication between the first port 11 and the third port 14 is controlled. The second valve mechanism opens as soon as the pressure of the part 2 to be lubricated rises to a predetermined value or higher and the sliding valve body 21 begins to descend, and the first port 11 and the third port 14 are connected to each other. communicate with each other.

In this way, the second valve mechanism opens and the first and third ports 1
1 and 14 communicate, the pressure at the first port 11 decreases, the pressure at the second port 12 becomes higher than the pressure at the first port 11, and the first valve mechanism closes. The first port that tends to be closed! 1 and the second port 12 tend to be cut off.

When the pressure in the part 2 to be lubricated further increases and the pressure in this part 2 exceeds a certain value, not only the second valve mechanism but also the third valve mechanism opens, and the first port 11 and the third valve mechanism open. port 14
At the same time, the second port 12 and the fourth port 16 communicate with each other.

The oil pump device of the present invention configured as described above operates as follows depending on the rotational speed of the engine that drives the first and second oil pumps 4.8.

When the engine rotates at a low speed, the sliding valve body 21 in the casing 20 of the flow path switching valve 10 remains in the highest position due to the elasticity of the compression spring 25 (the state shown in Figure 's1), The valve portion 29 on the outer surface of the sliding valve body 21 and the valve seat portion 30 on the inner peripheral surface of the casing 20 do not separate.

Therefore, the pressure in the first port 11 that communicates with the discharge port of the second oil pump 8 through the fifth flow path 9 is reduced through the sixth flow path 13 and the second flow path 5. The pressure in the part of the second port 12 leading to the part 2 to be lubricated is higher than the pressure in the part of the second port 12, and the ball 23 forming the first valve mechanism is in contact with both ports 11.12.
The spherical body 23 is pushed up by the pressure difference between the valve seats 24 and 24, and the first valve mechanism becomes open.

As a result, not only the lubricating oil discharged from the first oil pump 4 is sent to the part 2 to be lubricated through the second flow path 5, but also the lubricating oil discharged from the second oil pump 8 is The portion 2 to be lubricated is
sent to.

At this time, the amount of lubricating oil sent to the part 2 to be lubricated becomes as shown by the straight line a → b in Fig. 2, and the flow rate of lubricating oil increases in proportion to the rotation of the engine, A sufficient amount of lubricating oil is pumped into part 2.

In FIG. 2, the dashed-dotted line A represents the relationship between the engine speed and the discharge amount of the first oil pump 4, and the dashed-double line B represents the relationship between the engine speed and the discharge amount of the first and second oil pumps. The relationship with the total discharge amount of the oil pump 4.8 is shown respectively.

Next, when the engine that drives the first and second oil pumps 4.8 rotates at medium speed, the portion 2 to be lubricated is
As a result, the sliding valve body 21 of the flow path switching valve 10 moves down by an amount corresponding to the pressure against the elasticity of the compression spring 25, and the first port 11 and the first port 11 The third port 14 communicates with the third port 14 (the second valve mechanism opens).

As a result, a part of the lubricating oil sent from the second oil pump 8 to the first port 11 via the fifth flow path 9 is sent from the third port 14 to the seventh flow path 15. Re,
The oil is directly returned to the suction port of the second oil pump 8.

In this way, a part of the lubricating oil sent into the first port 11 is returned to the suction port of the second oil pump 8, and as a result, the pressure in the first port 11 decreases, and this The pressure in the first port 11 portion becomes lower than the pressure in the second port portion 12.

Along with this, the sphere 23 constituting the first valve mechanism,
Pressed down by the pressure difference between the first and second ports 11 and 12, the first valve mechanism is closed, and the oil is discharged from the second pump 8 and passed through the fifth flow path 9 to the first port. Of the lubricating oil sent to port 11, the second port 1
The amount sent to 2 is limited.

As a result, all or part of the lubricating oil discharged from the second oil pump 8 is returned to the suction port of the second oil pump 8 without being sent to the part 2 to be lubricated. This second oil pump 8 is now driven with a small torque, and wasteful power consumption is prevented.

Even in this case, since the first oil pump 4 is driven at a sufficient speed, a sufficient amount of lubricating oil is sent to the portion 2 to be lubricated.

That is, in this case, by adjusting the opening degrees of the first valve mechanism and the second valve mechanism, (if both valve mechanisms are not provided), as shown by the broken line C in FIG. The amount of lubricating oil to be supplied is changed as shown by the straight line C to prevent power loss due to excessive lubricating oil supply.

Furthermore, the engine rotates at high speed, and the second oil pump 8
Even if the entire amount of lubricating oil discharged from the second oil pump 8 is directly returned to the suction port C of the second oil pump 8, if the amount of lubricating oil sent to the part 2 to be lubricated becomes too large (
3i8- oil pump 4 alone), the pressure introduced to the pressure introduction port 19 through the pressure introduction passage 18 becomes even higher, and the sliding valve body 21 of the passage switching valve 10 It descends further than in the case of medium speed rotation, and the communication port 26 formed in the upper part of the sliding valve body 21 is in an open state spanning the second port 12 and the fourth port 16, and the third When the valve mechanism is opened, a portion of the lubricating oil sent out from the first oil pump 4 is transferred to the sixth flow path 13, the second port 12, the third valve mechanism, the fourth port 16, The lubricating oil is returned to the inlet of the first oil pump 4 through the second flow path 17, and only the amount of lubricating oil necessary to maintain the pressure of this part 2 at the desired value is fed into the part 2 to be lubricated. .

That is, in this case, by adjusting the opening degree of the third valve mechanism (assuming that the third valve mechanism is not provided), the change will occur as shown on the right side of the dashed line A in Fig. 2. The amount of lubricating oil to be supplied is changed as shown by the straight line C-d to prevent power loss caused by excessive lubricating oil supply.

As a result, not only the torque required to drive the second oil pump 8 is sufficiently reduced, but also the torque required to drive the first oil pump 4 is reduced to a certain extent, thereby reducing unnecessary power consumption. Prevented.

Even in this case, since the first oil pump 4 is driven at a sufficient speed, a sufficient amount of lubricating oil is sent to the portion 2 to be lubricated.

Next, FIG. 3 shows a second embodiment of the present invention.

In the case of this embodiment, the sliding valve body 2 constituting the flow path switching valve 10
A check valve 35 is provided at the bottom of the valve body 1, and includes a valve body 32 and a compression spring 34 that presses the valve body 32 against a valve seat 33 provided above.

When the engine rotates at medium speed and the pressure of the part 2 to be lubricated rises to a certain extent, the check valve 35 opens in response to the pressure, and the check valve 35 opens from the first port 11 to the third port 1.
4, let all or part of the lubricating oil escape.

That is, the check valve 35 ensures that when the engine rotates at medium speed, the amount of lubricating oil sent to the part 2 to be lubricated is as shown by the straight line b-C from the broken line C in FIG. It seems to be decreasing.

The other configurations and operations are the same as those of the first embodiment described above, so the same parts are given the same reference numerals and redundant explanations will be omitted.

In each of the above-mentioned embodiments, the flow path switching valve 1
0 is provided with a pressure introduction port 19, and this pressure introduction port 1
9, the pressure in the part 2 to be lubricated is transferred to the pressure introducing space 2.
However, the part 2 to be lubricated and the second port 12 are in communication via the second and sixth passages 5.13, and the pressure in the part 2 to be lubricated is and second port 1
Since there is a certain relationship between the pressure of the inner part of 2,
The pressure introduction port 19 and the pressure introduction channel 18 are omitted, and the pressure introduction space 28 and the second port 12 are made to communicate with each other, so that the sliding valve body 21 is operated only by the pressure inside the second port 12. It can also be moved.

However, by providing the pressure introduction port 19 and the pressure introduction flow path 18, it becomes less susceptible to changes in the viscosity of the lubricating oil, and even when the engine temperature changes, the flow rate control of the lubricating oil can be stabilized. There are effects that can be done.

(Effects of the Invention) Since the oil pump device of the present invention is configured and operates as described above, it is possible to always supply an appropriate amount of oil regardless of changes in the rotational speed of the machine that drives the oil pump, such as the engine. In addition, when the rotational speed of the machine is high, the power of the machine is not wasted, the apparent output of the machine is increased, and the fuel consumption rate is reduced.

[Brief explanation of drawings]

Fig. 1 is a piping diagram showing a first embodiment of the oil pump device of the present invention, Fig. 2 is a diagram showing the relationship between the amount of oil supplied by this oil pump device and the engine speed, and Fig. 3 is a diagram showing the relationship between the oil supply amount and engine speed according to the invention. FIG. 3 is a piping diagram showing a second embodiment of the oil pump device. 1 oil pan, 2: @ sliding part, 3: first flow path, 4: first oil pump, 5: second flow path, 6: third flow path, 7:'s fourth Channel, 8:'s second oil pump, 9: Fifth channel, 10: Channel switching valve, 11: First port, 12: Second port, 13: Sixth channel, 14 :
Third port, 15: seventh flow path, 16; fourth port, 17: flow path to 34, 18: pressure introduction flow path, 19: pressure introduction port, 20: casing, 21: sliding valve body, 2
2: Inner flow path, 23: Sphere, 24: Valve seat, 25: Compression spring, 26.27: Communication port, 28; Pressure conduction space, 29
: 1P part, 3o: Valve seat part, 31: Partition wall, 32: Valve body, 33: Valve seat part, 34: Compression spring, 35: Check valve.

Claims (1)

[Claims] (1) An oil reservoir that stores oil, a first channel that communicates with the oil reservoir at one end, a first oil pump that communicates the suction port with the other end of the first channel, and one end of the first channel that communicates with the oil reservoir. A second flow path is connected to the discharge port of the first oil pump, and the other end is connected to the inlet of the part that requires oil, and one end is connected to the outlet of the part that requires oil, and the other end is connected to the a third flow path communicating with the oil reservoir; a fourth flow path having one end communicating with the oil reservoir; and a second oil pump having a suction port communicating with the other end of the fourth flow path. , a fifth flow path having one end communicated with the discharge port of the second oil pump, a flow path switching valve having the other end of the fifth flow path communicating with the first port, and the flow path switching A sixth flow path having one end communicated with the second port of the valve and the other end communicating with the above portion, one end communicating with the third port of the flow path switching valve, and the other end communicating with the second oil. A seventh flow path communicates with the inlet of the pump or the oil reservoir, one end communicates with the fourth port of the flow path switching valve, and the other end communicates with the inlet of the first oil pump or the oil reservoir. between the first port and the second port.
A first valve mechanism that opens when the pressure on the first port side is higher than the pressure on the second port side is provided between the first port and the third port through the pressure introduction port. The pressure of the part that requires the above oil, which is introduced into the road switching valve,
Alternatively, a second valve mechanism that opens when the pressure inside the second port reaches a predetermined value is switched between the second port and the fourth port through the pressure introduction port. Each oil pump device has a third valve mechanism that opens when the pressure introduced into the valve or the pressure inside the second port further increases and exceeds a certain value.