JPH02191806A - Oil pump for output adjustment type engine - Google Patents

Abstract

PURPOSE:To make it possible to adjust the output of an oil pump by providing a side plate constituting the side wall of a pump chamber capable of sliding so that it can separate from or make contact with the end surface of an oil driving rotary member. CONSTITUTION:A side plate 14 is made to slide so as to separate from an inner rotor 8 and an outer rotor 9 by actuating an electric actuator 16 through a controller 17. Consequently, a clearance is formed between the side plate 14 and the inner rotor 8 the outer rotor 9, and oil leaks from the clearance and an amount of pressure-delivered oil by the inner rotor 8 and the outer rotor 9 decreases against the rotary state of an engine. Subsequently, when the side plate 14 is made to slide to approach the inner rotor 8 and the outer rotor 9 by the actuator 16, the amount of oil increases in comparison with an amount corresponding to the rotary state of the engine. Consequently, it is possible to restrain unnecessary increase of an engine load and effectively utilize the engine output.

Description

DETAILED DESCRIPTION OF THE INVENTION C. Industrial Field of Application The present invention is an output! This article relates to an oil pump for a 1g type engine.

[Prior Art] Engines are generally equipped with engine oil pumps that supply lubricating oil inside the engine. These engine oil pumps include trochoid type, gear type, internal gear type, etc. There is something. Each of these oil pumps drives oil by rotating an oil-driving rotating member, and each of these rotating members is connected to the engine crankshaft via a belt or the like, and power is transmitted from the crankshaft. , which rotates as the engine rotates.

For example, in the case of a trochoid type oil pump, an inner rotor connected to the crankshaft via a pulley, a belt, etc., and an outer rotor that rotates as the inner rotor rotates are the rotating members for moving the oil, and the rotational force of the engine is The inner rotor and outer rotor, which are rotated by the rotor, work together to pump oil.

In the case of an internal gear oil pump, tooth surfaces are formed on the outer periphery of the inner rotor and the inner periphery of the outer rotor in the trochoidal oil pump, so that the internal gear corresponding to the inner rotor is inscribed in the ring gear corresponding to the outer rotor. Almost the same as a trochoid oil pump,
The internal gear and ring gear are rotated by the rotational power of the engine to pump oil.

In addition, if it is a gear type oil pump, a pair of gears as rotating members are rotationally driven by the rotational force of the engine,
Oil is pumped through the grooves of the gear teeth.

[Problems to be Solved by the Invention] Incidentally, the above-mentioned conventional output-adjustable engine oil pumps use the rotational force of the engine to drive a rotating member as the engine rotates to pump oil. Therefore, the discharge amount of lubricating oil (discharge amount per unit time)
is approximately proportional to the engine speed. Therefore, when the engine speed is low but the engine load is large (at low speed and high load), it is necessary to set the pump capacity above a certain level in order to ensure the required lubricating oil discharge amount.

However, if the pump capacity is set high in this way, when the engine speed is high but the engine load is small (at high speed and low load), more lubricating oil will be discharged than necessary, causing the engine to This results in unnecessary output consumption, which poses a problem in effectively utilizing the engine output.

Note 1: For example, a relief valve is provided downstream of the lubricating oil discharge path to prevent the lubricating oil supply from becoming excessive, but even when such a relief valve operates, the oil pump does not perform more than a certain amount of work. Therefore, engine power is used unnecessarily.

The present invention was devised in view of such problems, and
To provide an output-adjustable engine oil pump capable of effectively utilizing engine output by adjusting the output of the oil pump.

[Means for Solving the Problems] Therefore, the oil pump for an output vR type engine of the present invention includes an oil pump housing having an oil suction port at one end and an oil discharge port at the other end, and the oil pump. An oil rotating rotating member that is built in the housing and receives power from the engine crankshaft and rotates as the engine rotates to drive oil; and a pump that is disposed on the end face of the rotating member. In an engine oil pump comprising a side plate forming a side wall of a chamber, the side plate is slidably equipped so as to be able to move toward and away from an end surface of the rotating member, and the side plate can be slidably driven. It is characterized in that it is provided with a side plate drive means and a control means capable of controlling the operation of the side plate drive means.

[Function] In the output-adjustable engine oil pump of the present invention described above, the side plate drive means is operated through the control means so that the side plate drive means separates the side plate from the oil-related rotating member. When the side plate is slid, a gap is created between the side plate and the end face of the rotating member, oil leaks from the gap, and the amount of oil pumped by the rotating member decreases relative to the rotational state of the engine. . On the other hand, when the side plate is slid closer to the oil moving rotating member by the side plate driving means, the gap between the side plate and the end face of the rotating member is reduced, and the gap is removed from the gap. The amount of oil leakage is reduced or almost eliminated, and the amount of oil pumped by the rotating member increases with respect to the rotational state of the engine.6 [Example] Hereinafter, output adjustment as an example of the present invention will be explained with reference to the drawings. To explain the oil pump for a type engine, FIG. 1 is a longitudinal sectional view thereof.

The output adjustable engine oil pump of this embodiment is a trochoidal oil pump, and as shown in FIG. 1, an oil pump housing 1 is disposed with its lower opening immersed in a lubricating oil tank. . A shaft 2 having a pulley 3 mounted thereon is pivotally attached to the housing 1.

This pulley 3 is connected via a chain or belt 4 to a crankshaft side pulley 6 attached to a crank shirt l-5 of the engine.
Power is transmitted from the

A rotor storage chamber 7 is formed around the shaft 2 in the housing 1, and in this rotor storage chamber 7, an inner rotor 8 as an oil drive rotating member and an outer rotor 8 as an oil waste drive rotation member are provided. 9 is equipped. this house.

The inner rotor 8 is attached to the shaft 2.

It is designed to be able to rotate together with the pulley 3. Further, the inner circumferential surface of the outer rotor 9 and the outer circumferential surface of the inner rotor 8 are intermittently in contact with each other, and between each contact point there is a pump chamber l.
O is formed. and.

The outer rotor 9 is rotatably supported within the rotor storage chamber 7, and rotates in the same direction at different rotational speeds as the inner rotor 8 rotates.

As described above, one end surface of the inner rotor 8 and the outer rotor 9 is in sliding contact with the wall 11 of the rotor storage chamber 7.
An oil port 12 and an oil outlet 13 communicating with a pump chamber formed between both rotors 8 and 9 are formed in the.

Furthermore, a side plate 14 is provided on the other end surfaces of the inner rotor 8 and the outer rotor 9.

The pump chamber 10 is surrounded by the outer circumferential surface of the inner rotor 8 , the inner circumferential surface of the outer rotor 9 , the wall portion 11 , and the side plate 14 .

The side plate 14 is installed so as to be slidable toward and away from the inner rotor 8 and outer rotor 9.

That is, the side plate 14 is disposed on the same axis as the shaft 2 and is attached to the shaft 15 which is pivotally supported by the housing 1 so as to be able to slide in the axial direction. This shaft 15 is slidably driven in the axial direction by an electric actuator 16 serving as side plate driving means.

The sliding range of the shaft 15 and the side plate 14 is from a state where the side plate 14 is extremely close to the inner rotor 8 and the outer rotor 9 to a state where the side plate 14 is separated by a required amount.

And as the electric actuator 16.

For example, an electromagnetic type in which the shaft 15 is driven by a solenoid can be considered.

The operation of such an electric actuator 16 is controlled by a controller 17 as a control means installed in the vehicle.

The controller 17 is configured to receive engine operating state information such as engine load information, temperature information, and intake negative pressure information, and temperature information of the lubricating oil 20 from a detection unit (not shown), etc. Based on this information, an appropriate activation signal is output to the electric actuator 16. Note that the metal temperature of the bearing portion, which approximately corresponds to the engine load, may be used as the engine load information.

On the other hand, a punching metal 18 is attached to the lower opening of the housing 1, and the lubricating oil 2o in the lubricating oil tank is sucked into the housing 1 through the gap between the punching metals 18 and flows into the oil population 12. It has become. Further, an oil outlet 19 is provided in the upper part of the housing 1 and communicates with the oil outlet 13.

In this oil pump, the side plate 14 is placed very close to the inner rotor 8 and the outer rotor 9 so that the required lubricating oil discharge amount can be obtained when the engine speed is low but the engine load is large (at low speed and high load). It is set to ensure that the pump capacity is above a certain level under certain conditions.

Note that in FIG. 1, the flow of lubricating oil and the sliding direction of the shaft 15 and the side plate 14 are indicated by arrows, respectively.

The output adjustable engine oil pump as an embodiment of the present invention is configured as described above, so it can be used when the engine speed is low but the engine load is large (low speed and high load), such as when driving uphill. ), the corresponding engine information is sent to the controller 17, and the electric actuator 16 is operated under control through the controller.
However, the shaft 15 is advanced to bring the side plate 14 very close to the inner rotor 8 and outer rotor 9.

As a result, the lubricating oil in the pump chamber 10 hardly leaks to the side plate 14 side, and the oil population 1
2 to the oil outlet 13, and the oil is forced to the oil outlet 1.
It is discharged from 9. Therefore, the required lubricating oil discharge amount can be obtained.

On the other hand, when the engine speed is high but the engine load is small (during high speed and low load), such as when driving downhill, corresponding engine information is sent to the controller 17, and the controller operates under the control of the controller. The electric actuator 16 moves the shaft 15 backward and the side plate 14
is separated from the inner rotor 8 and outer rotor 9 by an appropriate amount.

As a result, the lubricating oil in the pump chamber 10 leaks in accordance with the distance ff1a of the side plate 14, and the amount pumped from the oil port 12 to the oil outlet 13 is reduced, and the oil discharge port 19 The amount of lubricating oil discharged from the engine also decreases with respect to the engine speed.

As a result, the amount of work for the oil pump is reduced.

The driving horsepower by which the engine drives this oil pump is reduced, suppressing unnecessary increases in engine load that are not directly related to driving, and enabling effective use of engine output.

In particular, since the distance fla of the side plate 14 from the inner rotor 8 and the outer rotor 9 is adjusted according to the operating state of the engine, the lubricating oil discharge amount can always be set to a size that is just the right amount.

In addition, by adjusting the separation amount a according to the temperature of the lubricating oil in addition to the engine operating condition, the lubricating oil discharge amount can be adjusted according to the viscosity of the lubricating oil. Sometimes, even though the engine speed is low, the temperature of the lubricating oil is low and its viscosity is high, so the oil pressure tends to become excessive, but this can be suppressed by setting the separation amount a to a certain value or more.

Note that in this embodiment, the relief valve is omitted because it is not required during normal operation, but it is also conceivable to add a relief valve downstream of the oil discharge port 19, for example, to be provided in the event of a device failure. .

Further, the configuration of such an output-adjustable engine oil pump is applicable not only to the trochoid type oil pump but also to gear type oil pumps, internal gear type oil pumps, and the like. For example, in the case of an internal gear type oil pump, the internal gear corresponding to the inner rotor and the ring gear corresponding to the outer rotor in the trochoid type oil pump become oil-driving rotating members, and the side plate 14 is attached to these rotating members. It is equipped to be slidable so that it can be moved towards and away from the opponent. Further, in the case of a gear-type oil pump, the side plate 14 is slidably equipped so as to be able to move toward and away from a pair of gears serving as oil-driving rotating members. In either case, as in the embodiment, the side plate 1
4 is slid and driven as appropriate.

[Effects of the Invention] As described in detail above, according to the output adjustable engine oil pump of the present invention, the side plate that is disposed on the end face of the oil-driven rotating member and constitutes the side wall of the pump chamber is rotated. The side plate driving means is equipped to be slidable toward and away from the end surface of the member, and is provided with a side plate driving means capable of slidingly driving the side plate, and a III control means capable of controlling the operation of the side plate driving means. This structure suppresses an unnecessary increase in engine load, enables effective use of engine output, and contributes to the driving performance of the vehicle.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an output adjustable engine oil pump as an embodiment of the present invention. 1-oil pump housing, 2-shaft, 3-...
Pulley, 4...-belt, 5-shaft crank, 6-
・Shaft crank side pulley, 7...rotor storage chamber,
8.-Inner rotor as oil-driven rotating member, 9
-Outer rotor as oil-driven rotating member, 10-
・-pump chamber, 11-wall, 12-oil inlet, 13-
oil outlet, 14-side plate, 15--shaft, 16--electric actuator as side plate driving means, 17-controller as control means;
18・-Punching metal, 19～・-Oil discharge port,
20.-Lubricating oil.

Claims (1)

[Claims] An oil pump housing has an oil intake port at one end and an oil discharge port at the other end. an oil-driving rotating member that rotates to drive oil;
An engine oil pump comprising a side plate disposed on an end face of the rotating member and forming a side wall of a pump chamber, the side plate being slidably equipped so as to be able to move toward and away from the end face of the rotating member. Along with
An output-adjustable engine oil pump, comprising: a side plate drive means capable of slidingly driving the side plate; and a control means capable of controlling the operation of the side plate drive means.