JPH0519509U - Engine oil jet structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the lubrication between the cam of the camshaft and the lever of the fuel pump to improve the durability. [Structure] A cam shaft 12 is rotatably attached to a cylinder head 11 via a cam cap 14. The lever 21 of the fuel pump 19 is brought into contact with the cam 20 fixed to the camshaft 12, and the fuel pump 19 is driven by the cam 20. Then, the lubricating oil of the oil jet is applied to the sliding surface of the lever 21 from the orifice 34 formed in the cam cap 14 to ensure the lubrication.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine oil jet structure for assisting lubrication of driven parts mounted on a cylinder head, and is suitable for lubrication of fuel pumps and the like.

[0002]

[Prior Art]

 A camshaft is rotatably supported on a cylinder head that forms a part of an automobile engine, and a rocker shaft that is parallel to the camshaft is mounted on the cylinder head. A plurality of rocker arms are rotatably attached to the rocker shaft so that the cams of the camshaft can come into contact with the base ends of the rocker arms. In addition, an intake valve that intakes air and an exhaust valve that exhausts air are movably mounted on the cylinder head. The upper end of each of the intake valve and the exhaust valve can be pressed by the tip of the rocker arm.

When the camshaft rotates, the cam comes into contact with the base end of the rocker arm to rotate the rocker arm and drive the intake valve and the exhaust valve.

Further, a fuel pump for feeding fuel to the engine is attached to the cylinder head, and a cam for the fuel pump attached to a cam shaft swings a lever of the fuel pump. , Was driving the fuel pump.

[0005]

[Problems to be solved by the device]

 As described above, the cam of the camshaft drives the fuel pump, but in order to ensure smooth sliding between the fuel pump lever attached to the cylinder head and the cam, an orifice that ejects lubricating oil to the cylinder head side. Had formed. Then, the lubricating oil from this orifice collides with the camshaft, which is a drive component, and the scattered oil is used for lubrication.

[0006] Therefore, since the scattered oil is used for lubrication, the lubricating oil does not reach the sliding portion sufficiently, the lubrication becomes insufficient, and the durability of the fuel pump decreases. .

[0007]

[Means for Solving the Problems]

 The oil jet structure of the engine according to the present invention is an engine oil jet structure that supplies lubricating oil between a lever of a driven part driven by a cam fixed to a cam shaft mounted on a cylinder head and the cam. An orifice is formed in a cam cap for attaching the cam shaft to the cylinder head, and an oil jet from the orifice hits a sliding surface of the lever that slides on the cam.

[0008]

[Action]

 When the cam shaft mounted on the cylinder head rotates, the lever of the driven component swings via the cam. At this time, the lubricating oil ejected from the orifice of the cam cap as an oil jet hits the sliding surface of the lever, and the lubricating oil lubricates the lever and the cam.

[0009]

【Example】

 One embodiment of the present invention is shown in FIG. 1 to FIG. 3, and this embodiment will be described based on these drawings.

FIG. 1 is a plan view of a main part of a cylinder head according to an embodiment, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a cam phase and oil according to the embodiment. It is a figure showing the relation with the collision point of a jet.

As shown in FIG. 1, a pair of parallel camshafts 12 and 13 are rotatably supported on a cylinder head 11 by a cam cap 14, and the camshafts 12 and 13 are axially fixed in a predetermined direction. A plurality of cams 15 are formed at intervals. A rocker arm 16 is arranged at a position corresponding to the cam 15, a base end portion of the rocker arm 16 is rotatably attached, and a cam 15 of the cam shafts 12, 13 is provided at an intermediate portion. It is possible to abut. Further, a plurality of intake valves 17 for intake and a plurality of exhaust valves 18 for exhaust to a combustion chamber (not shown) are movably mounted on the cylinder head 11. The upper ends of the intake valve 17 and the exhaust valve 18 can be pressed by the tip of the rocker arm 16.

A fuel pump 19, which is a driven component, is attached to a side portion of the cylinder head 11, and a cam 20 for a fuel pump formed on the cam shaft 12 causes a lever 21 to swing. The fuel pump 19 can be driven.

On the other hand, as shown in FIGS. 1 and 2, the passages 31 and 32 through which the lubricating oil, which is sent from an oil pump (not shown) and lubricates a sliding component, passes through the cylinder head 11 is formed in the cam cap 14, and a passage 33 connected to the passages 31 and 32 is also formed in the cam cap 14. Then, in FIG. 1, on the line connecting the center of the lever 21 and the center of the cam 20, the orifice for ejecting the lubricating oil is located at the position of the cam cap 14 where the lubricating oil directly contacts the sliding surface 21a of the lever 21. 34 are formed.

Therefore, when the engine is driven, the cam shaft 12 and the cam 20 fixed to the cam shaft 12 rotate, and the lever 21 swings accordingly and the fuel pump 19 is driven. At this time, the lubricating oil flows through the passages 31, 32 and 33, and the lubricating oil is jetted from the orifice 34 by the pressure of the oil pump as shown by the arrow B and directly hits the sliding surface 21a of the lever 21 to cause the cam. Lubrication between 20 and lever 21 is ensured.

However, although there is a risk that the cam 20 may impede the collision of the oil jet, which is the jetted lubricating oil, with the lever 21, as shown in (a) to (h) of FIG. Since the phase, which is the rotation angle of the above, collides with the lever 21 in a considerably wide range of about 90 ° to 225 °, the lubrication does not become insufficient.

Although the driven component is the fuel pump in this embodiment, it may be another component such as an oil pump for sending lubricating oil.

[0017]

[Effect of the device]

 According to the oil jet structure of the engine of the present invention, an orifice is formed in the cam cap for mounting the cam shaft on the cylinder head, and the oil jet is ejected from the orifice to the lever of the driven component. Unlike the case where the levers are lubricated with the scattered oil by colliding the blades, the lubrication does not become insufficient, wear is prevented and durability is improved.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part of a cylinder head according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a diagram showing a relationship between a cam phase and an oil jet collision point according to an embodiment of the present invention.

[Explanation of symbols]

 11 Cylinder Head 12, 13 Cam Shaft 14 Cam Cap 15, 20 Cam 31, 32, 33 Passage 34 Orifice

Claims (1)

[Scope of utility model registration request] 1. An oil jet structure of an engine for supplying lubricating oil between a lever of a driven component driven by a cam fixed to a cam shaft mounted on a cylinder head and the cam, wherein the cam shaft is An oil jet structure for an engine, wherein an orifice is formed in a cam cap attached to the cylinder head, and an oil jet from the orifice is applied to a sliding surface of the lever which slides on the cam.