JPS6024912Y2 - Hydraulic drive system for engine accessories - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulic drive device for engine accessories.

In conventional engines, some of the auxiliary parts, such as cooling fans and hydraulic timers, were driven and controlled by the pressure of lubricating oil. , oil is transferred from oil pan 1 to oil strainer 2, oil pump 3, and oil cooler 4.
, the oil is introduced into the oil gear rally 6 formed in the cylinder body through the oil filter 5, and is introduced into each sliding and rotating part of the engine, such as crank bearings C and B, connecting rod bearings R and B, camshaft bearing SB1, head pulse mechanism H0v1, near compressor AC1 timing gear T, G, injection pump I, P, partial filter P, F, piston cooling oil jet P, C
etc. for lubrication, cooling, etc., and is also supplied to hydraulically driven auxiliary parts 7 for driving purposes.

Further, 8 is a relief valve of the oil pump 3, which normally has an opening pressure of about 8 to 10 kg/cm, and when the oil pressure rises above the opening pressure, the valve is opened and the oil pan 1 is This is to return the oil and adjust the hydraulic pressure.

9 is the bypass valve of oil cooler 4, usually 1 to 2
It has a valve opening pressure of about kg1aA, and when the oil pressure rise due to the flow resistance inside the cooler becomes larger than the valve opening pressure, the valve is opened to bypass the oil, and the oil cooler 4
It is designed to prevent damage to the

10 is the oil relief valve on the oil gear rally 6 side,
It normally has a valve opening pressure of about 4 to 5 ko/c4, and when the oil pressure in the oil gear gallery increases abnormally, the valve is opened to return oil to the oil pan 1 and adjust the oil pressure.

In this type of system in which oil is supplied to the hydraulically driven auxiliary parts 7 from the oil gear gallery 6 as a lubricating oil path, the amount of oil supplied to the sliding parts and rotating parts is large, so the engine There was a problem that the oil pressure necessary for driving could not be secured at low rotation speeds.

In addition, as a means to improve this, it is possible to increase the size of the oil pump 3 or to increase the size of actuators such as hydraulic cylinders and hydraulic motors that constitute the drive parts of auxiliary parts, but this would increase the size of the device. , increase in weight,
This may cause problems such as increased horsepower loss and increased costs.

Furthermore, it is also possible to branch off and supply drive hydraulic pressure immediately after the oil pump 3, but in this case, the oil cooler 4
Since the oil is not allowed to pass through the oil filter 5, the oil temperature becomes extremely high, and especially at high temperatures and low rotations, the oil pressure decreases and its pressure fluctuations become large, which may result in significant fluctuations in driving force.

Furthermore, since the cleanliness of the oil cannot be ensured, there is a risk of damaging the drive unit or clogging the pipes.

This project was devised in view of the above points, and is designed to prevent oil pressure fluctuations caused by increases in oil temperature, maintain its cleanliness, and secure the necessary oil pressure at low engine speeds. The purpose of the present invention is to provide a hydraulic drive device of the same type, and the gist of this article is to provide an engine having at least a lubricating oil path for pumping oil from an oil pump through an oil cooler and an oil filter to an oil gear gallery,
A pressurization valve that opens at a pressure lower than the opening pressure of the oil pump relief valve is installed immediately before the oil gear rally, and oil is supplied from the front of the pressurization valve to the drive parts of hydraulically driven auxiliary equipment. One embodiment of this will be described below with reference to FIGS. 2 and 3.

Note that parts that are the same as those of the conventional device shown in FIG. 1 are given the same reference numerals.

Fig. 2 shows the oil circulation system of the engine in the embodiment of the present invention. Oil enters the oil pump 3 from the oil pan 1 via the oil strainer 2, is pumped by the pump 3, and is then transferred to the oil cooler 4 and the oil pump filter. 5
A pressurizing valve 20 is disposed between the oil filter 5 and the oil gear rally 6, and a hydraulically driven auxiliary equipment component 7 drive unit ( (not shown) is provided with a branch path 11 that connects to a branch (not shown).

lla indicates a return oil path from the auxiliary equipment part 7 to the oil pan 1.

As shown in FIG. 3, the pressurizing valve 20 has a stepped portion 23 that serves as a valve seat formed in the middle of an internal passage 22 of a case 21, and a cup-shaped valve body 24 opens to the stepped portion 23. It is urged to be biased by a spring 25 that regulates the valve pressure.

A plug 28 having an oil passage 27 formed therein is attached to the open end of the spring chamber 26 by screw connection.

The oil passage 27 of the plug returns oil that has entered the spring chamber 26 to the oil pan 1 via an oil pipe 30.

On the other hand, an oil pipe 31 serving as an oil path from the oil filter 5 is connected to the other open end of the internal passage 22 .

Further, a branch passage 11 to the auxiliary equipment component 7 is connected to the front side of the stepped portion 23 of the internal passage 22, and an oil passage serving as an oil passage to the oil gear rally 6 is connected to the rear side closed by the valve body 24. A pipe 32 is connected.

Further, the opening pressure of the valve element 24 is set by the strength of the spring 25 so as to be equal to the minimum oil pressure required to drive the auxiliary equipment part 7, but the magnitude is determined by the oil circulation. Opening pressure of pump relief valve 8 (8 to 1
0 to 9/aliya oil gear rally 6 relief valve 1
It is necessary that the opening pressure is smaller than the valve opening pressure of 0 (4 to 5 to 9/aft), and is preferably about 1 to 3 kg/crPL, for example.

In the drive device and oil circulation system configured as described above, the valve body 24 of the pressurizing valve 20 is closed until the opening pressure reaches a valve opening pressure equal to the minimum oil pressure required to drive the auxiliary component 7.

Then, the oil pressure is applied to the spring 2 by driving the oil pump 3.
5 and pushes the valve body 24 to the right in the figure and begins to flow toward the pipe 32 side toward the oil gear gallery 6 side, the oil pressure in the internal passage 22 reaches the minimum oil pressure required to drive the auxiliary parts 7. Therefore, it acts on the drive part of the auxiliary part 7 through the branch path 11, and starts driving the auxiliary part 7.

Therefore, even when the engine rotates at low speeds, the minimum oil pressure necessary for driving the auxiliary parts 7 is always ensured, and the driving of the auxiliary parts 7 is not hindered.

In addition, since the oil to the auxiliary parts 7 is guided to the pressurizing valve 20 after passing through the oil cooler 4 and the oil filter 5, it is possible to prevent oil pressure drop and oil pressure fluctuation at high temperatures and low rotations, and it is relatively Since the auxiliary parts 7 can be driven stably and the oil can be kept clean, damage to the drive part of the auxiliary parts 7 can be prevented, and a durable and reliable drive device can be provided. be.

Incidentally, in the above embodiment, a pressurizing valve as shown in FIG. 3 was used, but it is natural that the structure of the pressurizing valve is not limited to the above as long as the function is satisfied.

Further, in the above embodiment, the oil filter 5 is disposed next to the oil cooler 4, but the oil filter 5 may be disposed in the opposite manner.

[Brief Description of the Drawings] Fig. 1 is a schematic system diagram showing a conventional example, Fig. 2 is a schematic system diagram showing an embodiment of the present invention, and Fig. 3 is a longitudinal sectional view of a pressurizing valve in the same embodiment. . 1. Oil pan, 3. Oil pump, 4. Oil cooler, 5. Oil filter, 6. Oil gear, 7. Auxiliary parts, 20. Pressure valve, 24. Valve body.

Claims (1)

[Scope of utility model registration request] In an engine that has a lubricating oil path that pumps oil at least from the oil pump through an oil cooler and an oil filter to an oil gear gallery, pressurization opens at a pressure lower than the opening pressure of the relief valve of the oil pump immediately before the oil gear gallery. 1. A hydraulic drive device for engine auxiliary machinery, characterized in that a valve is provided and oil is supplied to a driving part of hydraulically driven auxiliary machinery from the front of the pressurizing valve.