JPH0730304U - Lubrication device for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] 1 for the lubrication system supplied via the main gallery and the lubrication system supplied via the cylinder head.
By directly supplying different oil pressures from two oil pumps, the ratio of lubrication is reduced and the driving horsepower of the oil pumps is reduced. [Structure] An oil pump (101) for discharging oil of different hydraulic pressure, and oil supply paths (102 and 103) for directly supplying the discharged oil of different hydraulic pressure to the main gallery (6) and the cylinder head portion (11). A lubricating device for an internal combustion engine, comprising:

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubricating device for an internal combustion engine, and more particularly, to a lubricating device for an internal combustion engine in which each part of the engine and a required amount of engine oil are pressure-fed by an oil pump.

[0002]

[Prior art]

 Conventionally, this type of lubricator is intended to reduce the frictional resistance caused by direct metal-to-metal contact, prevent seizure, reduce noise, and prolong the life of the engine.The details are not uniform. However, generally, as shown in Fig. 2, the oil contained in the oil pan is pressure-fed to the main gallery by an oil pump, and from there, it is fed to the crankshaft / piston system and the cylinder head side. There is. Japanese Unexamined Patent Publication No. 61-46408 and Japanese Utility Model Laid-Open No. 3-89991 disclose techniques relating to this type of lubricating device and its oil pump.

In FIG. 2, 1 is an oil pump, 2 is a relief valve provided in the bypass passage 3 for controlling the discharge pressure from the oil pump 1, 4 is an oil pan, 5 is an oil strainer, The oil introduced from the oil pan 4 through the oil strainer 5 is pressure-fed to the main gallery 6 by the oil pump 1, and the main flow from this lubricates and cools the main bearing 7, the crankshaft 8 and the connecting rod bearing 9. After that, it is further guided into the cylinder bore of the piston and returned to the oil pan 4. Further, a part of it is depressurized from the main gallery 6 by the orifice 10 and then guided to the cylinder head portion 11 to lubricate and cool the valve lifter 13, the cam shaft 14, and the cam journal 15 through the oil gallery 12 in the head. Then it is returned to the oil pan 4.

[0004]

[Problems to be solved by the device]

 However, in such a conventional lubrication device for an internal combustion engine, the oil pressure required to lubricate the crankshaft and the oil pressure required to lubricate the cylinder head are different, and It is necessary to set the hydraulic pressure sent to the latter low. Therefore, unnecessary energy is consumed by depressurizing the oil pump 1 once it has been increased to high pressure by the orifice 10, thus wasting the dynamic power of the internal combustion engine. Moreover, since the oil pressure and the oil amount of the oil supplied to the oil gallery 12 of the cylinder head portion 11 via the orifice 10 are controlled, the consumption amount of the oil changes due to wear of the cam journal 15 and the rocker arm. Then, the oil pressure in the oil gallery 12 also changes accordingly, and the reliability of the lubricating system is impaired.

The object of the present invention is to pay attention to the conventional problems as described above, and mainly to operate the valve system through the lubrication system supplied to the crankshaft system through the main gallery and the oil gallery of the cylinder head section. A lubrication system for an internal combustion engine that can reduce the driving horsepower of an oil pump by obtaining a rational lubrication supply by directly supplying different oil pressures to the lubrication system supplied to the To do.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides an oil pump that discharges oil of different hydraulic pressure in a lubricating device for an internal combustion engine that supplies oil discharged from an oil pump to a main gallery and a cylinder head portion. Further, the oil supply passage for directly supplying the oil of different hydraulic pressure to the main gallery and the cylinder head portion is provided.

[0007]

[Action]

 According to the present invention, different oil pressures are generated and discharged by the oil pump, and the discharged oils having different oil pressures are directly supplied to the main gallery side and the cylinder head side by individual oil supply passages. This eliminates the need to provide an orifice to make the oil supplied to the cylinder head side lower in pressure than the oil supplied to the main gallery side, reducing the horsepower consumed by the oil pump and reducing the cylinder head section. It is possible to prevent a shortage of oil supply to the side.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. Here, 101 is a dual oil pump according to the present invention, and as the oil pump 101, for example, the one disclosed in Japanese Utility Model Laid-Open No. 3-89991 previously proposed by the present inventor is used. be able to. By the way, this disclosed example is characterized in that the discharge port is divided into a plurality of parts, and the discharge port is divided into an upstream side and a downstream side on the discharge side in the rotational direction of the inner rotor and the outer rotor. ing. Therefore, during the oil discharge process, the volume chamber between the rotors is once confined between both discharge ports, and it is possible to discharge different oil pressures on the upstream side and the downstream side.

Returning to FIG. 1 again, 102 is a first oil supply passage for guiding oil from the high pressure side discharge port 101 A of the double type oil pump 101 to the main gallery 6, 103 is a cylinder from the low pressure side discharge port 101 B It is a second oil supply passage for guiding oil to the head portion 11 side. The amount of oil and the oil pressure introduced into the first oil supply passage 102 and the second oil passage 103, respectively, are set when the dual oil pump 101 is planned. Reference numerals 104 and 105 denote bypass passages and relief valves provided on the first oil supply passage 102 side in relation to high-pressure side oil pressure setting, and 106 and 107 denote second oil supply in relation to low-pressure side oil pressure setting. A bypass passage and a relief valve provided on the side of the passage 103.

Therefore, in the lubricating device for an internal combustion engine configured as described above, the oil to be supplied to the cylinder head portion 11 side can be directly supplied from the dual oil pump 101 while maintaining a predetermined low pressure, Unlike the conventional case, it is not necessary to consume unnecessary energy of decompressing the oil, which has been increased in pressure to be supplied to the main gallery 6, with the orifice 10. Since the other configurations and operations are the same as those of the conventional example shown in FIG. 2, the description thereof will be omitted.

Further, in the above-mentioned embodiment, the trochoid type internal gear pump having two discharge ports is applied as the dual oil pump, but the dual oil pump used in the present invention has such an internal gear pump. The pump is not limited to the contact gear pump. For example, two sets of gear pumps arranged coaxially to obtain two types of hydraulic pressure, and two types of hydraulic oil are supplied as one pump. Of course, it may be in any form as long as it is one.

[0013]

[Effect of device]

 As described above, according to the present invention, in the lubricating device for an internal combustion engine that supplies oil discharged from the oil pump to the main gallery and the cylinder head part, an oil pump that discharges oil of different hydraulic pressure is used. Since it has an oil supply path for directly supplying the discharged oil of different hydraulic pressures to the main gallery and the cylinder head portion, it is possible to reduce the horsepower consumption of the oil pump, and in particular, the cam journal, rocker arm, Even if the amount of oil required increases due to wear of the rocker shaft, etc., it is possible to maintain an oil supply of sufficient hydraulic pressure to replenish the oil in the oil gallery of the head part, so reliable lubrication supply is possible. It can contribute to the provision of systems.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a lubricating system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a lubrication system according to a conventional example.

[Explanation of symbols]

 4 Oil Pan 6 Main Gallery 7 Main Bearing 8 Crank Shaft 11 Cylinder Head 12 Oil Gallery 101 Dual Oil Pump 101A, 101B Discharge Port 102 First Oil Supply Path 103 Second Oil Supply Path 105, 107 Relief Valve

Claims (1)

[Scope of utility model registration request] 1. A lubricating device for an internal combustion engine, which supplies oil discharged from an oil pump to a main gallery and a cylinder head portion, and an oil pump which discharges oil of different hydraulic pressure, and the discharged oil of different hydraulic pressure. A lubricating device for an internal combustion engine, comprising: a main gallery and an oil supply passage for directly supplying to a cylinder head portion.