JPS63289213A - Engine lubricating device - Google Patents

Abstract

PURPOSE:To promote the warm-up of an engine and to reduce the slide resistance of a piston by cutting off a cooling water passage communicated with a cylinder block when the temperature of the engine is low, and by jetting lubricating oil to the piston. CONSTITUTION:An oil pump 8 for sucking up lubrication oil stored in an oil pan 6 is connected to an oil jet 11 through a lubrication oil passage 10 so as to form a lubrication oil injection means. Further, a temperature sensor 18 as a means for detecting the temperature of cooling oil is provided in a water feed pipe line 13 downstream of an water pump 17. Further, a change-over valve 19 as a shut-off valve is provided between the water feed pipe line 13 and cooling water passages 1a, 2a. Meanwhile a control unit 20 is connected with means 21, 22 for detecting the rotational speed and load of the engine, respectively. Further, when the temperature of water s below a reference value, the cooling water passage 1a communicated with the cylinder block is shut off, and lubrication oil is jetted into the piston from the oil jet 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine lubrication device equipped with a lubricating oil injection means mainly consisting of an oil jet nozzle or the like for cooling a piston.

[Conventional technology]

Conventionally, as disclosed in Japanese Patent Application Laid-open No. 60-30411, for example, there is an oil pump that delivers lubricating oil stored in an oil pan, and the lubricating oil supplied from this oil pump is injected toward the back surface of the piston. The lubricating oil injection nozzle is configured to inject lubricating oil from the lubricating oil injection nozzle to prevent knocking only when a large load is applied to the engine and the engine temperature is high. Are known.

[Problem that the invention seeks to solve]

However, in the conventional configuration described above, lubricating oil is injected only when the engine temperature is high, and the resistance caused by the lubricating oil during warm-up operation is not taken into account. That is, at the beginning of warm-up operation, the engine temperature is low, so the temperature of the lubricating oil is difficult to rise, and the viscosity coefficient of the lubricating oil is high. For this reason, the system resistance increases on the sliding surfaces of the piston and the bearings.
This results in a reduction in engine output and fuel efficiency. Therefore, when lubricating oil is injected during warm-up in an attempt to speed up the temperature rise of the lubricating oil, the piston becomes overcooled, which conversely causes deterioration of exhaust gas and further increases the resistance on the piston sliding surface. This has the problem that the

[Means for solving problems]

In order to solve the above problems, the engine lubricating device of the present invention includes an on-off valve that controls the flow of cooling water to the cooling water passages that are independently formed in the cylinder head and the cylinder block, and an engine lubricating device. Temperature detection means for detecting temperature, and controlling the on-off valve so that the flow of cooling water to the cooling water passage of the cylinder block is cut off when the temperature detected by the temperature detection means is below a reference temperature. a lubricating oil injection means for injecting lubricating oil onto the lower surface of the piston; and a lubricating oil injection means for injecting lubricating oil at least when the temperature detected by the temperature detecting means is equal to or lower than a reference temperature. The lubricating oil injection control means controls the lubricating oil injection control means.

[For production]

During warm-up operation when the engine temperature is low, the flow of cooling water to the cooling water passage on the cylinder block side is interrupted to promote a rise in the temperature of the cylinder block, and the lubricating oil is injected from a lubricating oil injection means to the lower surface of the piston. As a result, the piston, whose temperature has become high, is cooled by the lubricating oil, and the lubricating oil is heated by the piston. Conventionally, there is a method to raise the temperature of lubricating oil, for example, by hitting the surface of the lubricating oil with a crankshaft, but this method of heating the lubricating oil by applying a mechanical shock is This is undesirable because it promotes oil deterioration.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 2, the engine is provided with a cylinder head 2 on a cylinder block 1, and a combustion chamber 4 is formed from the cylinder head 2 and the upper surface of a piston 3 slidably provided in the cylinder block 1. is formed. A cooling water passage 1a is formed in the cylinder block 1, while a cooling water passage 2a is formed in the cylinder head 2,
These cooling water passages 1a and 2a each form a separate system. The piston 3 has a concave lower surface and is connected to the crankshaft 9 via a connecting rod 3a. On the other hand, lubricating oil 5 is placed under the cylinder block 1.
The cylinder block 1 and the oil pan 6 together form a crank chamber 7.
is formed. The cylinder block 1 in the crank chamber 7 is provided with an oil pump 8 that sucks up the lubricating oil 5 contained in the oil pan 6. The lubricating oil passage 10 is provided for each cylinder of the engine, and the lubricating oil 5
It is connected to an oil jet nozzle 11 that injects. The oil pump 8 and the lubricating oil supply pipe 10a
, the lubricating oil passage 10 and the oil jet nozzle 11 constitute a lubricating oil injection means.

The above-mentioned cooling water passages 1a and 2a, as shown in FIG.
It is connected to a radiator 14 through water supply pipes 12 and 13 to form a closed loop. Furthermore, water supply pipe 12.1
3 is connected to a bypass conduit 15 which is parallel to the radiator 14. The above-mentioned bypass pipe line 15 and water supply pipe line I2
Radiator 1 is connected to the connection part when the cooling water temperature is low.
A thermostat 1-16 that operates to block the flow of cooling water in four directions and allow the cooling water to flow only to the bypass pipe 15.
is provided. Further, a water pump 17 for forcibly circulating cooling water is provided in the water supply pipe 13 between the connection part between the bypass pipe 15 and the water supply pipe 13 and the cooling water passages 1a and 2a. water pump 1
A water temperature sensor 18, which is a temperature detection means for detecting the temperature of the cooling water, is provided downstream of the cooling water. Further, at the connection portion between the water supply pipe 13, the cooling water passage la, and the cooling water passage 2a, a control unit 20, which will be described later, controls the flow of cooling water from the water supply pipe 13 to the cooling water passages 1a and 2a. A switching valve 19 is provided which is an on-off valve that shuts off the direction of the cooling water passages 1a and 2a or the direction of the cooling water passage 1a and switches only the direction of the cooling water passage 2a based on a control signal. Note that the switching valve 19 may be provided closer to the cooling water passage Ia than the above-mentioned connecting portion to open and close this pipe. The water temperature sensor 18, the switching valve ↓9, and the oil pump 8 are connected to a control unit 20.

Further, the control unit 20 is connected to a rotation speed detection means 21 for detecting the engine rotation speed and a load state detection means 22 for detecting the load state applied to the engine. The rotational speed detection means 21 includes a distributor that supplies high pressure for ignition to the spark plugs disposed in each cylinder of the engine, and the load state detection means 22 includes the distributor and an air flow meter that detects the amount of intake air. Alternatively, it may consist of a throttle valve opening sensor or the like.

On the other hand, the control unit 20 controls the switching valve 19 so that the flow of cooling water to the cooling water passage 1a of the cylinder block 1 is cut off when the temperature detected by the water temperature sensor 18 is below the reference temperature. , when the detected temperature is equal to or higher than the reference temperature, the temperature detected by the switching valve control means, which is an on-off valve control means that controls the cooling water to flow through both the cooling water passages 1a and 2a, and the water temperature sensor 18 is the reference temperature. When the temperature is below, the oil pump 8 is controlled to supply the lubricating oil 5 to the oil jet nozzle 11 and inject it, and the rotation speed detecting means 21
When the engine rotational speed indicated by is equal to or higher than the reference rotational speed, or when the load detected by the load state detection means 22 is equal to or higher than the reference load, for the oil pump 8,
The oil jet nozzle 11 is provided with lubricating oil injection control means for supplying lubricating oil 5 to the oil jet nozzle 11 and controlling the oil jet nozzle 11 to inject the lubricating oil 5.

In the above configuration, the operation of the lubricating device of this engine will be explained based on the flowchart shown in FIG.

First, the coolant temperature is read by the water temperature sensor 18 (SL), and the coolant temperature, that is, the engine temperature is set to a reference temperature T HW n at which the lubricating oil 5 has a large viscosity coefficient.
It is determined whether or not it is less than or equal to (S2). If the cooling water temperature is equal to or lower than the reference temperature T HW n, the switching valve 19 is actuated to switch the cooling water passage 1a of the cylinder pro-7ri 1.
The flow of cooling water to is cut off (S3). As a result, cooling of the cylinder block 1 is suppressed, the temperature of the piston 3 increases, and warm-up of the engine is promoted. At the same time, the oil pump 8 is driven to supply the lubricating oil 5 to the oil jet nozzle 11, and the lubricating oil 5 is injected (S4
). As a result, the lubricating oil 5 is heated in the piston 3,
The viscosity of the lubricating oil 5 is reduced, and the resistance of the sliding surface of the piston 3 and the bearings is reduced. After that, the process moves to step 1.

Further, in step 2, if the cooling water temperature is equal to or higher than the reference temperature T HW B, the switching valve 19 is driven to flow the cooling water to the cooling water passage 1a of the cylinder block 1 and the cooling water passage 2a of the cylinder head 2. Let (S5)
. At the same time, the engine rotation speed and the state of the load on the engine are read from the outputs of the rotation speed detection means 21 and the load state detection means 22 (S6). Then, it is determined whether the engine rotation speed is less than or equal to the reference rotation speed N, which is a criterion for determining whether or not the engine rotation speed is a high rotation speed (37). If the engine rotation speed is less than or equal to the reference rotation speed N3, the load applied to the engine is high. It is determined whether the load is less than or equal to the reference load amount T8, which is a criterion for determining whether the load is a load or not (S8). If the load is less than the reference load ffl'r, the process moves to step 1. Also, step 7 above
If the engine rotational speed is equal to or greater than the reference rotational speed Nm in step 8, or if the load is equal to or greater than the reference load amount T in step 8, the oil pump 8 is driven to inject the lubricating oil 5 (S9); Move to 1. By injecting the lubricating oil 5 in step 9, the piston 3 and the bearing are cooled and knocking is prevented.

In the above control, steps 2, 3, and 5 are controls related to the switching valve control means, and steps 4, 6 to 9 are controls related to the lubricating oil injection control means.

〔Effect of the invention〕

As described above, the engine lubricating device of the present invention includes an on-off valve that controls the flow of cooling water to the cooling water passages that are formed independently in the cylinder head and the cylinder block, and a temperature control system that controls the temperature related to the engine temperature. When the temperature detection means detects and the temperature detected by this temperature detection means is below the reference temperature,
On-off valve control means for controlling the on-off valve so that the flow of cooling water to the cooling water passage of the cylinder block is blocked;
Lubricating oil injection means for injecting lubricating oil onto the lower surface of the piston;
The lubricating oil injection control means controls the lubricating oil injection means so that the lubricating oil is injected at least when the temperature detected by the temperature detection means is equal to or lower than the reference temperature.

Therefore, during warm-up operation when the engine temperature is low, the flow of cooling water to the cooling water passage of the cylinder block is cut off, and lubricating oil is injected to the piston. As a result, the piston is appropriately heated, and the heated piston is cooled by the lubricating oil. That is, the lubricating oil is heated by the piston, and the viscosity coefficient of the lubricating oil is reduced. Therefore, warm-up of the engine is promoted, and
The sliding surface of the piston and the bearing have the effect of reducing the resistance of the system, etc., reducing the load on the engine during warm-up, and improving engine output and fuel efficiency.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, in which FIG. 1 is an overall configuration diagram showing an engine lubricating device, and FIG. 2 is a schematic vertical sectional view showing the internal structure of the engine. , 3rd
The figure is a flowchart showing the operation of the engine lubricating device. 1 is a cylinder block, 1a is a cooling water passage, 2 is a cylinder head, 2a is a cooling water passage, 3 is a piston, 5 is lubricating oil, 8 is an oil pump (lubricating oil injection means), 10 is a lubricating oil passage (lubricating oil injection means), 10a is a lubricating oil supply pipe (
11 is an oil jet nozzle (lubricating oil injection means), 18 is a water temperature sensor (temperature detection means), 1
9 is a switching valve (on/off valve), 20 is a control unit (
(on/off valve control means, lubricating oil injection control means), 21 is rotational speed detection means, and 22 is load state detection means. Patent applicant Mazda Corporation $1 Figure 3

Claims (1)

[Claims] 1. An on-off valve that controls the flow of cooling water to cooling water passages that are formed independently in the cylinder head and cylinder block, a temperature detection means that detects the temperature related to the engine temperature, and a temperature detection means that detects the temperature related to the engine temperature. an on-off valve control means that controls the on-off valve so that the flow of cooling water to the cooling water passage of the cylinder block is cut off when the detected temperature is below a reference temperature; and lubrication that injects lubricating oil onto the lower surface of the piston. The present invention is characterized by comprising an oil injection means and a lubricating oil injection control means for controlling the lubricating oil injection means so that the lubricating oil is injected at least when the temperature detected by the temperature detection means is equal to or lower than a reference temperature. Engine lubrication system.