JPS6220652Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lubricating device for a bearing of a cooling fan drive shaft disposed substantially opposite to an end face of a camshaft.

[Prior Art] A bearing that supports a drive shaft of a cooling fan in a conventional engine is usually provided at a position substantially opposed to an end surface of a camshaft. Since this bearing is subjected to a relatively heavy load, it is necessary to forcibly supply lubricating oil, and therefore it is necessary to connect pipes for supplying and discharging lubricating oil near the bearing. However, the space around the bearing is narrow and it is difficult to install the pipe, and the installed pipe makes the space around the bearing even more cramped, and there is also the risk of oil leaking from the pipe connection. Furthermore, it was difficult to supply oil from the pipe to the bearings.

On the other hand, the full specification of Utility Model Application Publication No. 54-8039 states,
A jet nozzle facing the inner surface of the gear chamber is installed on the end face of one shaft (the camshaft in the example) at the meshing part of the drive gear and the driven gear in the gear chambers of a pair of drive shafts and driven shafts (the crankshaft and the camshaft in the example). A technique is disclosed in which the lubricating oil injected from the nozzle is guided by a guide surface formed on the inner surface of the gear chamber and supplied to the meshing portion. However, in this technology, the lubricating oil injected from the end face of the camshaft is reversed on a guide surface and guided to the meshing part in order to lubricate the engaging part below the camshaft, and the cooling fan drive shaft is located approximately opposite to the end face of the camshaft. This method does not solve the above-mentioned problem of the endless supply of lubricating oil to the bearings.

In addition, the full specification of Utility Model Application Publication No. 53-88637 states that the lubricating oil in the gear chamber containing the gear at the end of the camshaft and the gear section of the distributor shaft driven by the gear is supplied to a core provided in the camshaft. Techniques are disclosed for returning to the cam chamber through holes and side holes. However, this technique returns the lubricating oil in the gear chamber, that is, the oil chamber, to the cam chamber, and does not solve the above-mentioned problem of the endless supply of lubricating oil.

[Purpose of the invention] Therefore, the object of the invention is to provide a lubricating device for the bearing of the cooling fan drive shaft that is not restricted by space and can supply lubricating oil to the bearing of the cooling fan drive shaft substantially facing the end face of the camshaft. There is a particular thing.

[Structure of the invention] According to the invention, in an engine in which the bearing of the cooling fan drive shaft is disposed substantially opposite to the end face of the camshaft, a camshaft that opens outward in the radial direction of the end face of the camshaft is provided at the end of the camshaft. A lubricating oil supply hole consisting of an axial oil supply hole parallel to the center line and a radial oil supply hole opening in an annular groove of the camshaft, one end communicating with the oil supply hole and the other end communicating with an oil supply hole provided in the cylinder block. and,
A lubricating oil drain hole is formed of an axial oil drain hole that opens at the center of the end face of the camshaft and passes through the center line of the camshaft, and a radial oil drain hole that has one end communicating with the oil drain hole and the other end opening into the cam chamber. It is set up.

[Operation and effect of the invention] Therefore, lubricating oil is injected and scattered from the radially outward rotating opening of the camshaft end face of the axial oil supply hole onto the bearing of the cooling fan drive shaft in parallel with the camshaft center line, and the lubricating oil is scattered. The bearing can be suitably lubricated by supplying the same amount of oil. Further, the height of the oil level of the bearing can be set arbitrarily by changing the inner diameter of the axial oil drain hole. Since the oil supply and drainage holes of the present invention are all provided within the camshaft, it is not restricted by the space around the bearing and does not require separate piping work, which is extremely convenient.

[Examples] Examples of the present invention will be described below with reference to the drawings.

In the figure, a ball bearing 3 is attached to a support 1 to rotatably support a drive shaft 2 of a cooling fan. An end portion 6 of a camshaft 5 is rotatably supported on the cylinder block 4 which abuts the support 1 via a bush 7 such that the end surface 11 of the camshaft 5 substantially faces the bearing 3. The end portion 6 is provided with an annular groove 8 into which lubricating oil is supplied from an oil supply hole 9 provided in the cylinder block 4 through a hole (not shown) in the bush. The end portion 6 has one or more radial oiling holes 10 extending radially into the annular groove 8 and having one end connected to the oiling hole 10 and the other end extending radially outwardly at a distance r of the end face 11 of the camshaft. An axial oil supply hole 12 parallel to the opening camshaft center line L is bored, and these radial oil supply hole 10 and axial oil supply hole 12 form a lubricating oil supply hole.

Furthermore, the end portion 6 has an axial oil drain hole 13 that opens at the center of the end surface 11 and has an inner diameter d passing through the center line L of the camshaft 5, and a radial oil drain hole that opens into the cam chamber A that communicates with the oil drain hole 13. A hole 14 is provided,
These axial oil drain holes 13 and radial oil drain holes 1
4 forms a lubricating oil drain hole.

In such a configuration, when the engine is operated, lubricating oil passes through the oil supply hole 9 of the cylinder block 4, the annular hole 8, the oil supply hole 10 at the end of the camshaft, and flows toward the bearing 3 from the oil supply hole 12, which rotates with a radius r. It is injected parallel to the center line L as shown by the arrow, scatters and is distributed all over the place, suitably lubricating the bearing 3.

The lubricating oil accumulates in the oil chamber B, and the oil that exceeds the oil level S is returned to the cam chamber A through the oil drain holes 13 and 14 as shown by the arrow. At this time, by changing the inner diameter d of the oil drain hole 13, the height of the oil level S of the bearing 3 can be set arbitrarily.

[Summary] As explained above, according to the present invention, it is possible to supply lubricating oil to the bearings of the cooling fan drive shaft to provide suitable lubrication, and to arbitrarily set the height of the oil level of the bearings. I can do it. The present invention is extremely convenient because the oil supply and drainage hole is provided in the camshaft, so it is not restricted by the space around the bearing and does not require any separate piping work.

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of the present invention. A...Cam chamber, B...Oil chamber, r...Oil supply hole 12
radius of rotation, 2... Cooling fan drive shaft, 3
... Ball bearing, 5 ... Camshaft, 6
...Camshaft end, 8...Annular groove, 10,1
2... Oil supply hole, 11... Camshaft end surface, 1
3,14...Oil drain hole.

Claims (1)

[Scope of utility model registration request] In an engine in which the bearing of the cooling fan drive shaft is disposed substantially opposite the end surface of the camshaft, the end of the camshaft has an axial oil supply hole parallel to the camshaft centerline that opens radially outward of the end surface of the camshaft, and one end thereof. a radial oil supply hole opening in an annular groove of the camshaft, the other end of which communicates with the oil supply hole and an oil supply hole provided in the cylinder block; A cooling device characterized by having a lubricating oil drain hole consisting of an axial oil drain hole passing through the center line and a radial oil drain hole having one end communicating with the oil drain hole and the other end opening into the cam chamber. Bearing lubrication device for fan drive shaft.