JPH0561407U - Lubricating device for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the oil passage structure in a lubricating device for an internal combustion engine. In a lubricating device for an internal combustion engine in which a drive gear 15 is formed in the middle of the camshaft 1 and an oil pump is driven via a driven gear 5 that meshes with the drive gear 15, a journal portion 11 is provided at the end of the camshaft 1. Forming an oil reservoir chamber 7 into which oil that has been lubricated is formed, and forming a shaft hole 16 in the camshaft 1 that communicates with the oil reservoir chamber 7.
Oil hole 1 that communicates with and is located on the driven gear 5 and opens
8 is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a lubricating device for an internal combustion engine.

[0002]

[Prior Art]

 In the conventional lubrication device for an internal combustion engine, oil stored in an oil pan is sucked up by an oil pump, pressure-fed to each part of the engine, and then returned to the oil pan.

In some camshafts for valve trains, oil is supplied to the journal from an oil passage formed in the engine block, and oil is supplied to the cam from an oil passage formed in the camshaft. (See, for example, Japanese Utility Model Laid-Open No. 56-124204).

[0004]

[Problems to be solved by the device]

 However, in an engine in which a cam shaft and an oil pump are arranged on the side wall of the cylinder block and a gear for driving the oil pump is formed in the middle of the cam shaft, an oil passage for supplying oil to the meshing portion of the gear is provided. When forming a cylinder block or the like, the oil passage structure becomes complicated, or the mounting position of the oil pump along with the driven gear is restricted.

The present invention aims to solve the above problems.

[0006]

[Means for Solving the Problems]

 The present invention relates to a lubricating device for an internal combustion engine in which a drive gear is formed in the middle of a camshaft and an oil pump is driven through a driven gear that meshes with the drive gear. An oil storage chamber for storing the oil is formed, a shaft hole communicating with the oil storage chamber is formed in the cam shaft, and an oil supply hole communicating with the shaft hole and located on the driven gear is formed.

[0007]

[Action]

 Oil that has lubricated the journal of the camshaft flows into the oil sump chamber, is guided from the oil sump chamber through the shaft hole of the camshaft to the driven gear through the oil supply hole, and lubricates the part that meshes with the drive gear. Reduce friction.

By forming the oil passage for lubricating the driven gear inside the camshaft, the oil passage structure on the cylinder block side can be simplified, and the degree of freedom in arranging the driven gear can be increased.

[0009]

【Example】

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

As shown in FIG. 1, a camshaft 1 provided in a multi-cylinder engine has cams 13 and 14 for driving intake / exhaust valves for each cylinder in the middle thereof, and an oil (not shown). It has a drive gear 15 for driving the pump.

Each of the cams 13 and 14 is adapted to open and close an intake / exhaust valve provided on the cylinder head via a valve lifter, a push rod, and a rocker arm (not shown).

The drive gear 15 drives an oil pump (not shown) via a driven gear 5 that meshes with the drive gear 15. The rotation center of the driven gear 5 is orthogonal to the rotation center of the camshaft 1 and rotates counterclockwise as shown by the arrow in the figure. The oil pump sucks up the oil collected in the oil pan and sends it to each part of the engine under pressure.

The camshaft 1 has a journal portion 11 formed at its rear end rotatably supported by a bearing portion 3 of a cylinder block 2 via a bush 4, and a plurality of journal portions 10 are rotatably supported. Has been done.

A sprocket (not shown) is connected to the front end of the camshaft 1, and the rotational force from the crankshaft is transmitted.

An oil passage (not shown) that opens in the bearing portion 3 of the cylinder block 2 is formed, and oil is supplied to the sliding contact portion between the bush 4 and the journal portion 11.

A groove 21 extending in the axial direction is formed in the upper portion of the bush 4. The groove 21 is open to the front end surface 22 of the bush 4. A part of the oil supplied between the bush 4 and the journal portion 11 is jetted from the groove 21 along the cam shaft 1 onto the cam shaft 1 as shown by the arrow in the figure, and lubricates the cams 13 and 14 respectively. It is like this.

The camshaft 1 is formed in a hollow structure having a shaft hole 16 therein. One end of the shaft hole 16 is opened to the rear end surface 17 of the camshaft 1, and the other end is closed.

A disk-shaped plug 6 is press-fitted into the bearing portion 3 of the cylinder block 2, an oil reservoir 7 is defined between the plug 6 and the rear end surface 17 of the camshaft 1, and the bush 4 and the journal portion 11 are formed. Part of the oil that has been lubricated flows into the oil reservoir chamber 7 as indicated by the arrow in the figure, and then flows from the oil reservoir chamber 7 into the shaft hole 16 of the camshaft 1.

An oil supply hole 18 communicating with the shaft hole 16 is formed on the driven shaft 5 of the camshaft 1. The oil from the shaft hole 16 is guided to the driven gear 5 through the oil supply hole 18 as shown by the arrow in the figure.

The oil supply hole 18 is opened on the driven gear 5 on the right side of the drive gear 15 in the figure, and the oil from the oil supply hole 18 is introduced to the entry side of the driven gear 5 rotating counterclockwise in the figure. By being guided, the meshed portions of the driven gears 5 and the driving gears 15 are sufficiently lubricated.

In this way, by supplying the oil that lubricates the driven gear 5 from the oil reservoir chamber 7 through the inside of the cam shaft 1, the oil passage structure provided on the cylinder block 2 side is simplified and The degree of freedom in arranging the drive gear 5 can be increased.

[0022]

[Effect of the device]

 INDUSTRIAL APPLICABILITY As described above, the present invention provides a lubricating device for an internal combustion engine, in which a drive gear is formed in the middle of a camshaft, and an oil pump is driven through a driven gear that meshes with the drive gear. An oil reservoir is formed at the end of the shaft to store the oil that lubricates the journal, and a shaft hole is formed in the camshaft to communicate with the oil reservoir. Since the oil supply hole that opens is formed, the oil passage structure provided on the cylinder block side is simplified, and the degree of freedom in arranging the oil pump together with the driven gear is expanded, and the engine can be made compact.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

[Explanation of symbols]

 1 camshaft 3 bearing 4 bush 5 driven gear 6 plug 7 oil reservoir 11 journal 16 shaft hole 15 drive gear 18 oil supply hole

Claims (1)

[Scope of utility model registration request] 1. A lubricating device for an internal combustion engine, wherein a drive gear is formed in the middle of a camshaft, and an oil pump is driven through a driven gear that meshes with the drive gear, and a journal portion is lubricated at the end of the camshaft. An oil storage chamber for storing oil is formed, a shaft hole communicating with the oil storage chamber is formed in the camshaft, and an oil supply hole communicating with the shaft hole and located on the driven gear is formed. Lubricating device for internal combustion engine characterized.