JPH0925810A - Timing chain lubricating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lubricating device for an inexpensive timing chain which can reduce number of items and improves producibility. SOLUTION: An orifice 11 having an oil injection port 10 is formed on an oil passage 8 inside a cylinder block 1. An oil guide part 15 composed of a reflection wall 16 for oil and an oil guide plate 17 is integrated with an inner wall 14 of a timing chain case 5 opposed to an oil injection direction of oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timing chain lubricating device for transmitting rotation of a crankshaft of an internal combustion engine to a camshaft or the like.

[0002]

2. Description of the Related Art An example of a timing chain train of an overhead camshaft type engine is shown in FIGS. A crankshaft sprocket 44 and a camshaft sprocket 45 are fixed to the front ends of a crankshaft 42 and a camshaft 43, respectively, which protrude from the front surface of the cylinder block 41, and are hung by a timing chain 46. In the lubricating device for the engine timing chain 46 arranged in this way, as shown in FIG. 5, an oil jet pipe 49 attached to the front surface of the cylinder block 41 using bolts 48 or the like is provided in the middle of the lubricating oil passage 47. Connect and connect the timing chain 46 to the circumferential surface of the oil jet pipe 49.
It is known that the oil blow-out hole 50 is provided so as to be directed to the lubrication required part. As an example, the actual exploitation 56-3
It is disclosed in Japanese Patent Publication No. 9807.

[0003]

However, in such a conventional example, parts such as the oil jet pipe 49 and the bolt 48 for connecting the oil jet pipe 49 to the oil passage 47 are required, and the number of parts is large and the productivity and the cost are high. It is disadvantageous. In addition, since it is necessary to adjust the blowout direction of the oil blowout hole 50 at the time of positioning during assembly, there is also a problem that the work takes time and labor and productivity is poor.

[0004]

In order to solve the above problems, the present invention provides an oil blowout hole in the middle of a lubricating oil passage and faces the jetting direction of oil jetted from the oil blowout hole. The timing chain case is integrally formed with an oil guide part formed of a reflection part formed and guide plates extending around both sides of the oil in a direction surrounding and surrounding the reflection part.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An oil outlet hole communicating with a lubricating oil passage provided in a cylinder block is installed in a front surface of a cylinder block, and oil ejected from the oil outlet hole is integrally provided in a timing chain case. The oil guide part is configured so that the oil is directed to the lubrication point by turning the oil with a guide plate.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. Since the timing chain train of the embodiment of the present invention is the same as the conventional one described above, different parts will be described. 1 is a side view of an essential part showing an embodiment of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a perspective view of an essential part of a timing chain case of the embodiment of the present invention. In the figure, reference numeral 1 is a cylinder block, 2 is a crankshaft, 3 is a crankshaft sprocket fixed to the crankshaft 2, 4 is a timing chain that meshes with the sprocket 3 and transmits the rotation of the crankshaft 2 to a camshaft, and 5 is a timing. It is a timing chain case fixed to the front surface 6 of the cylinder block 1 that covers the chain train. An oil passage 8 communicating with an oil gallery 7 in the cylinder block 1 is provided in the front surface 6 of the cylinder block 1 so as to open above the sprocket 3, and the oil from the oil passage 8 is provided in the opening 9 in the cylinder. Orifice 11 having an oil blow-out hole 10 that blows forward in a direction substantially perpendicular to the front surface 6 of the block 1.
Is press-fitted.

Further, the chain case 5 is formed by aluminum die casting, and the flat plate portion 1 which covers the front side of the sprocket 3 and the timing chain 4 with a predetermined gap therebetween.
2 and an edge portion 13 forming a vertical wall by being bent toward the cylinder block 1 side from the end portion to the entire circumference is formed, and the edge portion 13 is fixed to the front surface 6 of the cylinder block 1 in a hermetically sealed state by bolts or the like. ing.

On the inner wall 14 of the chain case 5, an oil guide portion 15 that diverts the direction of the oil blown forward from the orifice 11 to the lower lubrication point and guides the oil in that direction is integrated with the chain case 5. Is formed in. That is, in the oil guide portion 15, a reflection wall 16 corresponding to the reflection portion is formed on the inner wall 14 facing the ejection direction X of the oil ejected from the oil ejection hole 10, and the oil hitting the reflection wall 16 is timed. The inclination direction of the reflection wall 16 is set in the direction Y so as to be turned toward the chain 4. Further, the guide plate 17 has the inner wall 1
4 is formed in a U-shape that stands lower than the height of the vertical wall of the edge portion 13 from the flat plate portion 12 and surrounds the reflection wall 16 behind the U-shape so as to extend on both sides of the oil in the direction Y toward the timing chain 4. Is formed in.

[0009]

According to the above structure, the reflecting portion is provided on the inner wall of the timing chain case facing the ejection direction of the oil ejected from the oil ejection hole, and the guides extending on both sides of the oil in the reflection direction surrounding the reflecting portion. Since the oil guide part consisting of a plate is formed integrally with the chain case, parts such as the oil jet pipe and its mounting bolts, which were required in the conventional example, are no longer required, and the number of parts can be reduced and the cost is reduced. The advantage that can be obtained is obtained. In addition, since the oil guide is installed up to the vicinity of the lubrication required part, the oil can be sprayed accurately and the lubrication effect can be enhanced, and there is no need to adjust the oil jet direction of the oil jet pipe. Workability can be improved.

[Brief description of drawings]

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

FIG. 2 is a front view showing the embodiment of the present invention.

FIG. 3 is a perspective view of a main part of the timing chain case according to the embodiment of the present invention.

FIG. 4 is a side view of a main part showing a conventional example.

FIG. 5 is a front view showing a conventional example.

[Explanation of symbols]

 5 Timing chain case 8 Oil passage 10 Oil outlet 15 Oil guide 16 Reflector 17 Guide plate

Claims (1)

[Claims] 1. A lubrication oil passage is provided with an oil ejection hole in the middle thereof, and a reflection portion formed facing the ejection direction of the oil ejected from the lubrication oil passage and both sides of the oil surrounding the reflection portion are reflected. A timing chain lubrication device for an internal combustion engine, wherein an oil guide portion consisting of a guide plate extending in a vertical direction is integrally formed with the timing chain case.