JPH0648085Y2 - Oil pump device for output adjustable engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an oil pump mounted on a vehicle, and particularly, when the vehicle is in an accelerating state, the output of the pump is temporarily reduced to reduce the engine output of the vehicle. The present invention relates to an oil pump device for an output adjustable engine that can be effectively used for acceleration.

[Prior Art] An engine is generally equipped with an engine oil pump that supplies lubricating oil to the inside of the engine. This engine oil pump is of a trochoid type, a gear type, an internal gear type, or the like. There is something. Each of these oil pumps drives oil by the rotation of an oil-driving rotary member. All of these rotary members are connected to a crankshaft of an engine via a belt or the like, and power is transmitted from the crankshaft. , It rotates with the rotation of the engine.

For example, in the case of a trochoidal oil pump, the inner rotor connected to the crankshaft via a pulley, a belt, etc., and the outer rotor that rotates with the rotation of the inner rotor function as an oil driving rotary member, and The inner rotor and the outer rotor, which are rotated by the above, cooperate to pump the oil.

In the case of the internal gear type oil pump, a tooth surface is formed on the outer circumference of the inner rotor and the inner circumference of the outer rotor in the trochoidal oil pump so that the inner gear corresponding to the inner rotor is inscribed in the ring gear corresponding to the outer rotor. Almost like the trochoidal oil pump,
The internal gear and the ring gear are rotated by the rotational force of the engine to pump the oil.

Further, in the case of a gear type oil pump, a pair of gears as rotating members are rotationally driven by the rotational force of the engine,
The oil is pumped by the groove portion of the gear teeth.

[Problems to be Solved by the Invention] By the way, in each of the above-mentioned conventional oil pump devices for an output adjustable engine, the rotational force of the engine is used to drive the rotating member in accordance with the rotation of the engine to pump the oil. Therefore, the discharge amount of oil (discharge amount per unit time) is substantially proportional to the engine speed. Normally, the oil pump is equipped with a relief valve, and the discharge amount and discharge pressure of oil are cut at a certain level.However, even if the discharge amount and discharge pressure are cut, the oil pump does not reach the engine speed. Do proportional work.

Therefore, as the engine speed increases, the friction of the oil pump also increases accordingly.

For this reason, there is a problem that the rapid rise of the engine speed is hindered by the friction of the oil pump.

The present invention has been devised in view of such problems,
An object of the present invention is to provide an oil pump device for an output adjustment type engine, which is capable of quickly raising the engine speed.

[Means for Solving the Problems] For this reason, the oil pump device for an output adjustable engine of the present invention operates in conjunction with the crankshaft of an engine mounted on a vehicle and produces an output corresponding to the rotational speed of the engine. An oil pump body capable of discharging and driving oil, a discharge amount adjusting means capable of adjusting an oil discharge amount of the oil pump body separately from a rotation speed of the engine, and an acceleration state detecting means for detecting an acceleration state of the vehicle. And a control means capable of controlling the discharge pressure adjusting means to temporarily operate to a low output side when it is determined that the vehicle is in an accelerating state by receiving information from the acceleration state detecting means. It is characterized by being.

[Operation] In the above-mentioned oil pump device for an output adjustable engine of the present invention, the oil pump main body operates in conjunction with the crankshaft of the engine to discharge and drive the oil at an output corresponding to the rotational speed of the engine. The discharge amount adjusting means adjusts the oil discharge amount of the oil pump body separately from the rotation speed of the engine. The discharge amount adjusting unit is controlled by the control unit based on the acceleration information of the vehicle detected by the acceleration state detecting unit, and when it is determined that the vehicle is in the acceleration state, the discharge amount adjusting unit drives the oil discharge drive. The output is temporarily adjusted to the low output side.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
1 to 3 show an oil pump device for an output adjustable engine as a first embodiment of the present invention. FIG. 1 is its configuration diagram, and FIGS. 2 (a) and 2 (b) are its discharges, respectively. 3 (a) and 3 (b) are time charts relating to the control of the discharge amount, and FIG. 4 is an oil pump device for an output adjustable engine as a second embodiment of the present invention. It is a block diagram which shows.

The oil pump main body 21 of the oil pump device for an output adjustable engine of each embodiment is a trochoidal oil pump and is installed in a vehicle such as an automobile.

First, the first embodiment will be explained. As shown in FIG. 1, the housing 1 of the pump body 21 is arranged such that its lower opening is immersed in a lubricating oil tank. A shaft 2 fitted with 3 is pivotally mounted. The pulley 3 is connected to a crankshaft side pulley 6 mounted on a crankshaft 5 of the engine via a chain or a belt 4, and power is transmitted from the crankshaft 5.

A rotor housing chamber 7 is formed around the shaft 2 in the housing 1, and an inner rotor 8 and an outer rotor 9 are installed in the rotor housing chamber 7.

Of these, the inner rotor 8 is mounted on the shaft 2 and can rotate together with the pulley 3. Further, the inner peripheral surface of the outer rotor 9 and the outer peripheral surface of the inner rotor 8 are in intermittent contact with each other, and a pump chamber 10 is formed between the contact points. The outer rotor 9 is rotatably supported in the rotor storage chamber 7, and the inner rotor 8 is
It rotates in the same direction at different rotation speeds.

As described above, one end surfaces of the inner rotor 8 and the outer rotor 9 are in sliding contact with the wall portion 11 of the rotor housing chamber 7, and the wall portion 11 has an oil inlet 12 communicating with the pump chamber 10 formed between the rotors 8 and 9. And an oil outlet 13 is formed.

A side plate 14 is provided on the other end surfaces of the inner rotor 8 and the outer rotor 9, and the pump chamber 10
Is formed by being surrounded by the outer peripheral surface of the inner rotor 8, the inner peripheral surface of the outer rotor 9, the wall portion 11 and the side plate 14.

The side plate 14 is slidably mounted on the inner rotor 8 and the outer rotor 9 so as to be able to come into contact with and separate from the inner rotor 8 and the outer rotor 9.

That is, the side plate 14 is attached to the shaft 15 which is arranged on the same axis as the shaft 2 and is axially supported by the housing 1 so as to be slidable in the axial direction.
Then, the side plate 14 together with the shaft 15 is slidably driven in the axial direction by an electric actuator 16.

By sliding the side plate 14 as described above, for example, the side plate 14 is moved to the inner rotor 8 and the outer rotor 9
The oil discharge amount of the oil pump main body 21 can be reduced by separating it from the oil pump main body 21, and the electric discharge of the oil pump main body 21 can be performed regardless of the rotation speed of the engine from the electric actuator 16 and the slidable side plate 14. A discharge amount adjusting means 22 capable of adjusting the amount is configured.

The sliding range of the shaft 15 and the side plate 14 is from the state where the side plate 14 is extremely close to the inner rotor 8 and the outer rotor 9 to the state where they are separated by a required amount. As the electric actuator 16, for example, an electromagnetic actuator in which the shaft 15 is driven by a solenoid can be considered.

The operation of this electric actuator 16 is controlled by a controller 17 as a control means mounted on the vehicle.

Further, this vehicle is provided with an acceleration state detecting means 26 for indicating the acceleration state (including deceleration) of the vehicle, and the acceleration information is sent from the acceleration state detecting means 26 to the controller 17. .

It should be noted that the acceleration information may be the acceleration itself or information that changes corresponding to the acceleration. For example, the rate of increase in engine speed dN _E / dt (N _E ; engine speed), throttle angle, A / The value of N _E (A: intake air amount, N _E : engine speed), intake pipe pressure, etc. may be detected and any one of these information may be sent to the controller 17.

Then, according to the acceleration information of the vehicle, the controller 17 determines that the vehicle has started acceleration when, for example, the vehicle is in an acceleration state larger than a predetermined acceleration, and the engine speed increases in accordance with the normal acceleration. The amount of oil discharged tends to increase, but a predetermined period (Δt ₁ ; delay time)
Discharge rate adjusting means 22 to suppress an increase in oil discharge rate
Is operated to the low output side.

Further, when the vehicle is in a deceleration state with a deceleration greater than a predetermined deceleration (negative acceleration) (a large absolute value), it is determined that the vehicle has started deceleration, and the engine speed decreases in accordance with the normal deceleration. Then, while the oil discharge amount is about to decrease, the discharge amount adjusting means 22 is controlled to operate to the high output side so as to suppress the decrease of the oil discharge amount for a predetermined period (Δt ₂ ; delay time). It is like this.

The above-described predetermined acceleration and predetermined deceleration are provided as a buffer zone (dead zone) as shown in FIG. 3 (a), and the control of the oil pump is stabilized.

Further, the discharge amount adjusting means 22 becomes a low output state when the side plate 14 is appropriately separated from the inner rotor 8 and the outer rotor 9 by the actuator 16, and the side plate 14 approaches the inner rotor 8 and the outer rotor 9 by the actuator 16. If this is done, it will be in a high output state.

In this example, a pressure sensor 24 that detects the oil discharge pressure that changes so as to substantially correspond to the oil discharge amount is provided near the oil outlet 13 of the oil pump main body 21, and the controller 17 controls the pressure sensor 24 from the pressure sensor 24. The discharge amount adjusting means 22 can be feedback-controlled so that a predetermined discharge amount can be obtained based on the information.

Here, when the discharge amount adjusting means 22 is set to the high output side, the side plate 14 is fixed to a state in which it is closest to the inner rotor 8 and the outer rotor 9 (that is, the maximum output state), and FIG. As shown in (a), as in the case of the conventional oil pump, when the oil discharge amount and the oil discharge pressure are in a state of being proportional to the engine speed, while the discharge amount adjusting means 22 is set to the low output side, The side plate 14 is fixed in a state of being closest to the inner rotor 8 and the outer rotor 9 until the engine speed is below a certain value.
When the engine speed exceeds a certain value, the side plate
By appropriately separating 14 from the inner rotor 8 and the outer rotor 9, as shown in FIG. 2 (b), when the engine speed is below a certain value, the maximum output state proportional to the engine speed is set, and the engine speed is When it exceeds a certain value, the oil discharge amount and the oil discharge pressure are set to be substantially constant.

Further, the discharge amount adjusting means 22 can also take an appropriate intermediate output state (not shown).

When suppressing the oil discharge amount through the discharge amount adjusting means 22, a map relating to the discharge amount (for example, FIG. 2B).
Are stored in a storage unit such as the controller 17 and the controller 17 controls based on this map.

Further, as shown in FIG. 1, a punching metal 18 is attached to the lower opening of the housing 1, and the lubricating oil 20 in the lubricating oil tank is sucked into the housing 1 through the gap of the punching metal 18. , Goes to the oil inlet 12. An oil discharge port 19 that communicates with the oil outlet 13 is provided on the upper portion of the housing 1.

In this oil pump, the side plate 14 is extremely close to the inner rotor 8 and the outer rotor 9 so that the required oil discharge amount can be obtained when the engine speed is low but the engine load is large (low speed and high load). It is set to ensure that the pump's capacity at a certain level or higher is secured.

In FIG. 1, arrows indicate the flow of the lubricating oil and the sliding directions of the shaft 15 and the side plate 14.

Since the oil pump device for an output adjustable engine as the first embodiment of the present invention is configured as described above, the controller 17 causes the vehicle to enter the acceleration state based on the acceleration information from the acceleration state detecting means 26. The oil discharge amount is controlled to a state as shown in FIGS. 3 (a) and 3 (b) by determining whether the vehicle is in the deceleration state, the deceleration state, or the low speed state.

That is, when the vehicle is in an acceleration state larger than the predetermined acceleration as shown in FIG. 3 (a), the oil discharge amount is increased for a predetermined period (Δt ₁ ) as shown in FIG. 3 (b). Control is performed to operate the discharge amount adjusting means 22 to the low output side so as to suppress it.

As a result, during acceleration, an increase in the amount of engine oil supplied, that is, an increase in friction of the oil pump, is suppressed, the engine output is effectively used for acceleration, and a rapid rise in engine speed during acceleration is achieved. realizable.

In particular, the suppression of the increase in the oil discharge amount is for a predetermined period (Δt ₁ ) after the start of acceleration, and at this time, the temperature of the engine oil is not usually too high, and the lubrication area is appropriately controlled. Since the oil film can be formed, it is not necessary to increase the oil discharge amount at the start of acceleration. Therefore,
The suppression of the increase in the oil discharge amount is not supported for engine lubrication. Further, the predetermined period (Δt ₁ ) for suppressing the increase in the oil discharge amount depends on the time until the oil discharge amount needs to be increased after the start of acceleration (this changes depending on the initial engine state). It can be set appropriately.

On the other hand, as shown in FIG. 3 (a), when the vehicle is in a deceleration state larger than the predetermined deceleration (negative acceleration) (large absolute value), as shown in FIG. During the period (Δt ₂ ), control is performed to operate the discharge amount adjusting means 22 to the high output side so as to suppress the decrease in the oil discharge amount.

As a result, the lubricating oil in the pump chamber 10 is pumped from the oil inlet 12 to the oil outlet 13 with almost no leakage to the side plate 14 side, and is discharged from the oil discharge port 19.

Therefore, during deceleration, the engine oil is usually at a high temperature for a while, and a large amount of engine oil is required to prevent seizure of the bearings. Will be able to supply. Further, although the suppression of the decrease in the oil discharge amount causes an increase in friction, it has an additional effect that it can contribute to engine braking.

A predetermined period (Δ
t ₂ ) can be appropriately set according to the time after the start of deceleration and until the temperature of the engine oil decreases (this changes depending on the initial engine state).

On the other hand, when the vehicle is in a substantially constant speed state, the discharge amount adjusting means 22 sets the oil discharge amount to the medium output state and discharges an appropriate amount of oil.

In this example, as shown in Fig. 3 (b), the increase suppression and the decrease suppression of the oil discharge amount are maintained at the state at the start of acceleration or the start of deceleration. Also makes the output even lower after the start of acceleration, but increases the output after the start of acceleration, or makes the output even higher than at the start of deceleration or decreases the output after the start of deceleration, but does so slowly. May be.

Further, the level a [see FIG. 2 (b)] that keeps the oil discharge amount constant when the discharge amount adjusting means 22 is on the low output side can be set to a required size according to each engine characteristic.

The setting pattern of the map on the low output side of the discharge amount adjusting means 22 is not limited to that shown in FIG. 2 (b), and for example, a curved pattern in which the inclination becomes gentle as the engine speed increases. Or a linear pattern with a gentler slope than the straight line on the high output side [see FIG. 2 (a)],
It can be set to various output patterns.

Next, the second embodiment will be described. In this embodiment, as shown in FIG. 4, the discharge amount adjusting means 22 'is different from that of the first embodiment. 22 'is an end wall of the rotor storage chamber 7'and a side plate 14
In the space 30 between the side plate 14 and the inner rotor 8
And a spring 27 that urges the outer rotor 9 side.
And a hydraulic pressure introducing pipe interposed between the oil outlet 13 and the space 30 so as to guide the discharge pressure of the oil pump into the space 30.
28 and a solenoid valve 29 interposed in the middle of the hydraulic pressure introducing pipe 28.

The urging force of the spring 27 is set according to the output level a [see FIG. 2 (b)] which limits the oil discharge amount to a constant value when the discharge amount adjusting means 22 'is set to the low output side. .

Then, the solenoid valve 29 is closed by the controller 17 at the time of low output and opened at the time of high output.

The other parts have the same structure as in the first embodiment, and the description thereof will be omitted.

The output adjustable engine oil pump device as the second embodiment of the present invention is configured as described above, and in the discharge amount adjusting means 22 ', the solenoid valve 29 is closed when the output is low. Therefore, the hydraulic pressure is not applied to the space 30, and the side plate 14 is biased mainly toward the inner rotor 8 and the outer rotor 9 by the biasing force of the spring 27, and the oil discharge pressure and the oil discharge amount are It is maintained in a constant state according to the pressure applied by the spring 27 regardless of the engine speed.

In other words, when the engine speed increases and the oil discharge amount and the oil discharge pressure try to rise, the spring 27 loses this force and the side plate 14 is separated from the inner rotor 8 and the outer rotor 9 to reduce the oil discharge amount and the oil discharge pressure. When the engine rotation speed is reduced and the oil discharge amount and the oil discharge pressure are reduced to prevent the rise, the spring 27 overcomes this force and the side plate 14 approaches the inner rotor 8 and the outer rotor 9 to cause the oil discharge amount and the oil discharge amount. Prevents pressure drop.

As a result, the oil discharge amount is adjusted in a pattern as shown in FIG.

Further, when the output is high, the solenoid valve 29 is always opened. As a result, a hydraulic pressure equal to the discharge pressure is applied to the space 30, and the side plate 14 is stronger than the inner rotor 8 and the outer rotor 9 side by the biasing force of the spring 27 due to the hydraulic pressure and the biasing force of the spring 27. It is urged toward the 9 side. Therefore, the side plate 14 is held in a state in which it is closest to the inner rotor 8 and the outer rotor 9 (that is, the maximum output state).

As a result, the oil discharge amount has a pattern as shown in FIG.

With such a discharge amount adjusting means 22 ', since the oil pump discharge amount can be adjusted in two stages of the high output state and the low output state, the increase suppression of the oil discharge amount at the time of acceleration can be suppressed in substantially the same manner as in the first embodiment. It can be carried out, and the same effect as that of the first embodiment can be obtained.

The configuration of the pump body 21 of the above-described oil pump device for an output adjustment type engine is not limited to the trochoidal type oil pump, but can be applied to a gear type and an internal gear type oil pump. For example, in the case of the internal gear type oil pump, the internal gear corresponding to the inner rotor and the ring gear corresponding to the outer rotor of the trochoidal oil pump serve as the oil driving rotary member, and the side plate 14
Are slidably equipped so as to be able to come into contact with and separate from these rotating members. Further, in the case of a gear type oil pump, the side plate 14 is slidably equipped so that it can be brought into contact with and separated from a pair of gears as an oil driving rotary member. In any case, the side plate 14 is appropriately slid as in each of the embodiments.

[Effect of the Invention] As described in detail above, according to the oil pump device for an output adjustable engine of the present invention, the oil pump device for an output adjustment engine operates in conjunction with the crankshaft of an engine mounted on a vehicle and corresponds to the rotational speed of the engine. An oil pump main body capable of discharging and driving oil with output, a discharge amount adjusting means capable of adjusting the oil discharge amount of the oil pump main body independently of the rotational speed of the engine, and an acceleration state for detecting an acceleration state of the vehicle. A detection means, and a control means capable of controlling the discharge pressure adjusting means to temporarily operate to a low output side when it is determined that the vehicle is in an acceleration state by receiving information from the acceleration state detection means. With such a configuration, the engine speed can be quickly raised at the time of acceleration, and there is an effect that it can contribute to improving the running performance of the vehicle.

[Brief description of drawings]

1 to 3 show an oil pump device for an output adjustable engine as a first embodiment of the present invention. FIG. 1 is its configuration diagram, and FIGS. 2 (a) and 2 (b) are its discharges, respectively. 3 (a) and 3 (b) are time charts relating to the control of the discharge amount, and FIG. 4 is an oil pump device for an output adjustable engine as a second embodiment of the present invention. It is a block diagram which shows. 1 ... Housing, 2 ... Shaft, 3 ... Pulley, 4
...... Belt, 5 ...... Shaft crank, 6 ...... Shaft crank side pulley, 7 ...... Rotor storage chamber, 8 ...... Inner rotor, 9 ...... Outer rotor, 10 ...... Pump chamber, 11 ......
Wall, 12 …… Oil inlet, 13 …… Oil outlet, 14 …… Side plate, 15 …… Shaft, 16 …… Electric actuator, 17 …… Controller as control means, 18 ……
Punching metal, 19 …… Oil discharge port, 20 …… Lubricating oil, 21 …… Oil pump body, 22 …… Discharge rate adjusting means,
24 …… Pressure sensor, 26 …… Acceleration state detection means, 27 ……
Spring, 28 ... hydraulic introduction pipe, 29 ... solenoid valve, 30 ... space.

Claims (1)

[Scope of utility model registration request] Claims: 1. An oil pump main body capable of being operated in conjunction with a crankshaft of an engine mounted on a vehicle to discharge and drive oil at an output corresponding to a rotational speed of the engine, and an oil discharge amount of the oil pump main body. The discharge amount adjusting means that can be adjusted separately from the engine speed, the acceleration state detecting means for detecting the acceleration state of the vehicle, and the vehicle in the acceleration state by receiving information from the acceleration state detecting means. An output-adjustable oil pump apparatus for an engine, comprising: a control means capable of controlling the discharge pressure adjusting means to temporarily operate to a low output side when determined.