JPH022887Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an engine lubrication device that supplies lubricating oil to an automobile engine.

Prior Art In conventional automobile engines, lubricating oil in an oil sump provided at the bottom of the engine is pumped up by a lubricant pump through an oil strainer, and the pressure of the pumped lubricant is regulated by a hydraulic regulator before being pumped into the lubricating pipe. The lubricating oil in the oil supply pipe is supplied to the cylinder block side, and a portion of the lubricant oil supplied into the oil supply pipe is supplied to the cylinder head side through an orifice installed in the oil supply pipe to limit the amount of engine oil supply. I am trying to have it refueled.

However, in such a conventional engine lubricating system, there is a delay in the supply of oil to the cylinder head side when the engine is started, which is a cause of wear in the valve train. Such a delay in oil supply to the cylinder head side at the time of starting the engine becomes more noticeable as the temperature of the lubricating oil at that time is low and the viscosity thereof is high.

Purpose This invention was made taking the above points into consideration.
An object of the present invention is to provide an engine lubricating device that can effectively prevent wear of a valve train by improving the delay in oil supply to a cylinder head when starting an engine.

Structure In order to achieve this objective, the present invention bypasses the orifice part provided in the oil supply pipe that transfers lubricating oil from the cylinder block side to the cylinder head side only when the engine is started, and supplies oil to the cylinder head side. This is to ensure that measures are taken to have it carried out directly.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the configuration of the oil supply system in the engine lubrication system according to the present invention.The lubricating oil in the oil reservoir 1 provided at the bottom of the engine is pumped up by the oil supply pump 3 through the oil strainer 2, and the pumped lubrication The pressure of the oil is regulated by the hydraulic regulator 4, and then it is forced into the oil supply pipe 5, and the lubricating oil in the oil supply pipe 5 is supplied to the crankshaft 6 portion on the cylinder block A side, and at the same time, in order to limit the amount of engine oil supply. The oil supply pipe 5 is connected from the hydraulic regulator 4 through an orifice 7 provided in the oil supply pipe 5.
A portion of the lubricating oil supplied inside is transferred to cylinder head B.
In the case where oil is supplied to the side camshaft 8 part, a bypass passage 9 of an orifice 7 is provided especially in the oil supply pipe 5 part, and an electromagnetic valve 10 for opening and closing the bypass passage 9 and an electromagnetic valve 10 for controlling the starting state of the engine are provided. A control circuit 12 is provided for controlling the opening and closing of the electromagnetic valve 10 in accordance with the output of the sensor 11 to be detected. The lubricating oil sent into the oil supply pipe 5 is supplied to each part of the crankshaft 6 through oil passages 13 branched from the oil supply pipe 5, respectively. Also cylinder head B
The end of the oil supply pipe 5 on the side is connected to a hollow rocker arm shaft 14, and the lubricating oil fed into the rocker arm shaft 14 is supplied to each part of the camshaft 8 through oil passages 15 branched from the shaft. (See Figure 2).
In the figure, 16 indicates a piston, and 17 indicates a rocker arm.

As shown in FIG. 3, in the hydraulic regulator 4, when the hydraulic pressure in the oil supply pipe 5 rises above a certain level, a relief valve 42 slides to the right in the figure against a spring 41 to open a relief hole 43. The lubricating oil in the oil supply pipe 5 is released from there, and the hydraulic pressure of the lubricating oil in the oil supply pipe 5 is adjusted. In such a hydraulic regulator 4, the oil supply pump 3, which pumps lubricating oil into the oil supply pipe 5, is driven in accordance with the rotation of the engine, so as shown in FIG. is the engine speed
It changes depending on Ne. In addition, the oil pressure adjustment characteristics are not uniformly determined by the temperature of the lubricating oil; when the temperature of the lubricating oil is low, its viscosity increases and the amount of relief decreases, so it is adjusted as the temperature decreases. Increasingly, oil pressure is becoming higher. Note that P in the figure indicates the set load point of the spring 41.

FIG. 5 shows the hydraulic characteristics a of the lubricating oil supplied to the cylinder head A side when the engine is started at a low temperature. Even if the oil pressure of the lubricating oil gradually rises from the start of engine startup (time t1) and passes the set load point P of the spring 41 in the hydraulic regulator 4, the relief valve 42 slides and the relief hole 43 opens. At the beginning of engine startup, the oil temperature of the lubricating oil is low and its properties are high, so the feeding resistance of the lubricating oil appears to be large, and the oil pressure becomes temporarily high (at time t4), and then the oil pressure gradually decreases to a predetermined level by the oil pressure regulator 4. The hydraulic pressure adjustment will be started (at time t5). In the figure, the period t1-t2 indicates the cranking period of the engine.

However, part of the lubricating oil having the hydraulic characteristic a in the oil supply pipe 5 is supplied to the cylinder head B side through the orifice 7, but in the early stages of starting the engine, the rotation speed is low. Since the lubricant temperature is low and the supply amount of lubricating oil is small, and the lubricating oil temperature is low and its viscosity is high, the resistance at the orifice 7 portion is large, and therefore b in Figure 5.
As shown in the characteristics, it takes a considerable amount of time for the oil pressure of the lubricating oil supplied to the cylinder head B side to rise to the specified level, and most of the lubricating oil is not supplied to the cylinder head B side during the period t2-t3. If this is not done, it will become a cause of wear in the valve train.

Therefore, in the present invention, when starting the engine, the control circuit 12 opens the electromagnetic valve 10 in accordance with the output of the sensor 11 that detects the starting state of the engine, and the cylinder head B is moved from the cylinder block A side to the cylinder head B side.
Orifice 7 for transferring lubricating oil to the side
By making the bypass passage 9 conductive, the resistance at the orifice 7 portion is eliminated, thereby improving the rise characteristics of the oil pressure of the lubricating oil supplied to the cylinder head B side, as shown as characteristic c in Fig. 5. ing.

At that time, a rotation sensor is used as a sensor to detect the starting state of the engine, and the engine rotation speed detected by the rotation sensor in the control circuit 12.
Ne is compared with the rotation speed Ns, which is a preset comparison standard, and when Ne<Ns, it is determined that the engine is in the starting state, and the electromagnetic valve 10 is moved to the open side until Ne=Ns. Control means are taken to drive it.

In addition, a hydraulic sensor is used as a sensor for detecting the starting state of the engine, and the cylinder block A detected by the hydraulic sensor in the control circuit 12 is
The orifice downstream oil pressure Pe in the oil supply pipe 5 on the side
and a preset comparison standard oil pressure Ps, and when Pe<Ps, it is determined that the engine is in a starting state, and the solenoid valve 10 is driven to the open side until Pe=Ps. Such control measures are taken.

Furthermore, a starter signal is adopted as a sensor output for detecting the starting state of the engine, and the control circuit 12
When the starter signal is detected, a control means is taken to drive the electromagnetic valve 10 to the open side for a certain period of time preset in an internal timer.

By appropriately combining these control means, when each determination condition is met, the solenoid valve 10 is driven to the open side under the control of the control circuit 12, and when the earliest of the closing conditions is satisfied, the solenoid valve 1 is driven to the open side.
It also becomes possible to perform control such as driving 0 toward the closed side.

Here, as shown in Fig. 4, we have explained the case where the hydraulic regulator 4 whose hydraulic characteristics are adjusted differently depending on the oil temperature is used. When a special hydraulic regulator is used, the adjusted hydraulic pressure will not become high even when the engine is started at a low temperature.
It is essential to improve the rise characteristics of the oil pressure of the lubricating oil supplied to the side.

Effects As described above, the engine lubricating device according to the present invention bypasses the orifice portion provided in the oil supply pipe that transfers lubricating oil from the cylinder block side to the cylinder head side when the engine is started. Since the cylinder head side is directly refueled, it has the excellent advantage of effectively improving the delay in refueling the cylinder head side at the time of starting the engine.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an oil supply system showing an embodiment of an engine lubrication system according to the present invention, Fig. 2 is a side view of the camshaft and rocker arm shaft portion in the same embodiment, and Fig. 3 is a configuration of a hydraulic regulator. FIG. 4 is a diagram showing the hydraulic characteristics of the hydraulic regulator, and FIG. 5 is a diagram showing the hydraulic characteristics of the lubricating oil on the cylinder block side and the hydraulic characteristics of the lubricating oil on the cylinder head side, respectively. . 1... Oil sump, 2... Oil strainer, 3... Oil supply pump, 4... Hydraulic regulator, 5... Oil supply pipe, 6... Crankshaft, 7... Orifice, 8...
...Camshaft, 9...Bypass path, 10...Solenoid valve, 11...Sensor, 12...Control circuit, 14...
...Rotzker arm shaft, 16...piston.

Claims (1)

[Claims for Utility Model Registration] 1. A first oil supply system that supplies hydraulically regulated lubricating oil to the cylinder block side lubricating section through an oil supply pipe, and supplying said hydraulic oil to the cylinder head side lubricating section through an orifice provided in the oil supply pipe. and a second oil supply system that supplies adjusted lubricating oil, the oil supply pipe is provided with an orifice bypass passage, a valve means for opening and closing the bypass passage, and a sensor for detecting the starting state of the engine. control means for controlling the opening and closing of the valve according to the output of the engine, and the valve is driven in the opening direction to open the bypass path when the engine starting state is detected by the sensor. Engine lubrication system. 2. The sensor for detecting the starting state of the engine is a rotation sensor, and the valve is opened by the control means when the engine rotation speed detected by the sensor is lower than a preset value. An engine lubricating device according to item 1. 3. The sensor for detecting the starting state of the engine is an oil pressure sensor, and the valve is opened by the control means when the oil pressure in the oil supply pipe detected by the sensor is lower than a preset value. An engine lubricating device according to item 1. 4. The engine lubricating device according to item 1 above, wherein the sensor output for detecting the starting state of the engine is an engine starter signal, and the valve is opened by the control means in response to the starter signal.