JPH0514509U - Locker arm of internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if lubricating oil is supplied to the sliding part between the rocker arm and the cam, a sufficient oil film can be secured at the sliding part between the rocker arm and the rocker shaft. [Structure] A rocker arm 3 that swingably slides is provided on a rocker shaft 1 having a lubricating oil supply path 6, and a first oil hole 13 is provided in a portion of the rocker shaft 1 on which the rocker arm 3 slides. Then, a second oil hole 14 is formed in the rocker shaft 1 near the rocker arm 3, and the second oil hole 14 is formed.
An opening / closing protrusion 16 having an oil outlet 15 for intermittently opening / closing 14 is formed on the side of the rocker arm 3. As a result, only the sliding portion between the cam and the rocker arm can be lubricated, so that a sufficient oil film can be secured in the sliding portion between the rocker arm and the rocker shaft.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rocker arm for an internal combustion engine that can be applied to a valve train of a four-cycle engine for automobiles.

[0002]

[Prior Art]

 Lubricating oil for forming an oil film that reduces the resistance to sliding friction is supplied to the sliding parts of the internal combustion engine, for example, the sliding parts of the rocker shaft and the rocker arm, and the sliding parts of the rocker arm and the cam shaft. As shown in FIG. 9 to FIG. 11, the lubricating oil consists of an oil hole 2 formed in a rocker shaft 1 and an oil jet hole 4 formed in a rocker arm 3 that slides at right angles to the rocker shaft 1. Will be supplied to.

That is, lubricating oil is supplied to the sliding portion between the rocker shaft 1 and the rocker arm 3 through the oil hole 2 to form an oil film, and the sliding portion between the rocker arm 3 and the cam 5 communicates with the oil hole 2. Lubricating oil is sprayed and supplied from the oil jet hole 4 to form an oil film. As a lubricating oil for the sliding portion of the rocker arm 3 and the cam 5, a part of the oil film formed on the sliding portion of the rocker shaft 1 and the rocker arm 3 is supplied as lubricating oil to the cam 5. Reference numeral 6 is a lubricating oil supply passage formed inside the rocker shaft 1.

Some rocker arm shafts are disclosed in Japanese Utility Model Publication No. 60-73808. In this publication, the lubricating oil is supplied to the sliding parts of the rocker arm shaft and the rocker arm, and the lubricating oil is supplied to the sliding parts of the rocker arm and the cam by the oil passage formed on the rocker arm shaft and the oil passage formed on the rocker arm. It is supposed to be started from. Further, as a rocker arm for an internal combustion engine, there is one disclosed in Japanese Utility Model Laid-Open No. 57-81411. In this publication, the rocker arm is provided with a communication hole from the rocker shaft to the slipper part attached to the tip of the rocker arm, and the lubricating oil is supplied to the sliding part between the rocker arm and the cam through this communication hole. is there. In this case, a cutout groove is formed in the slipper portion to open the communication hole. Further, as a lubricating mechanism for the rolling type rocker arm, there are those disclosed in Japanese Utility Model Laid-Open Nos. 59-117811 and 59-117815. According to this publication, lubricating oil is supplied to the sliding portion between the rocker arm and the cam through oil holes formed in the rocker arm shaft or the roller for lubrication.

[0005]

[Problems to be solved by the device]

 According to the conventional technique described above, a part of the oil film formed on the sliding portion between the rocker arm and the cam is supplied as the lubricating oil to the sliding portion between the rocker arm and the cam. It was necessary to supply a large amount of lubricating oil in order to fill the oil film on the sliding part of the shaft.

The rocker arm shaft disclosed in Japanese Utility Model Laid-Open No. Sho 60-73808 lubricates the sliding portion between the rocker arm and the cam through an oil passage formed inside the rocker arm. In addition to the fact that an oil passage must be formed in the structure, the structure becomes complicated, and there is a problem that the sliding portion between the rocker arm and the rocker arm shaft is not sufficiently lubricated as in the prior art of the present invention. The rocker arm for an internal combustion engine disclosed in Japanese Utility Model Laid-Open No. 57-81411 forms a communication hole in the rocker arm and forms a notch groove in the slipper part to supply lubricating oil from this communication hole. However, there is a problem that the structure is more complicated than that of a rocker shaft with oil holes. Further, there is a problem that the sliding portion of the rocker arm and the rocker arm shaft is not sufficiently lubricated as in the prior art of the present invention. Furthermore, the lubrication mechanism of rolling type rocker arms disclosed in Japanese Utility Model Laid-Open No. 59-117811 and Japanese Utility Model Laid-Open No. 59-117815 has a problem that the structure is complicated.

The present invention has been made to solve the above-mentioned conventional problems, and improves the oil hole of the rocker shaft and the shape of the rocker arm to supply lubricating oil to the sliding portion of the rocker arm and the cam 5. Another object of the present invention is to provide a rocker arm for an internal combustion engine that can sufficiently secure an oil film on the sliding portion between the rocker arm and the rocker shaft.

[0008]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems, the present invention provides a rocker arm having a lubricating oil supply passage with rocker arms that slidably slide at right angles to each other, and a rocker shaft in a portion where the rocker arm slides (1) An opening / closing projection having an oil blow-out portion, which is provided with an oil hole, has a second oil hole formed in a rocker shaft near the rocker arm, and intermittently opens and closes the second oil hole at a side portion of the rocker arm It is characterized by forming a section.

[0009]

[Action]

 According to the present invention, the first oil hole is provided in the rocker shaft where the rocker arm slides in this way. Therefore, the oil film that reduces the resistance of sliding friction between the rocker shaft and the rocker arm is the first oil hole. It is possible to form by the lubricating oil sent from. Further, the oil film for reducing the resistance force of sliding friction between the rocker arm and the sliding portion of the cam can be formed by the lubricating oil blown out from the oil blowout portion communicating with the second oil hole.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in FIGS. 9 to 11 are designated by the same reference numerals and will be described. 1 to 4, 1 is a rocker shaft and 3 is a rocker arm. The rocker arm 3 is swingably attached to the rocker shaft 1. One end 3a of the rocker arm 3 slides on the cam 5 and the intake valve 7 and the exhaust valve 8 provided at the other end 3b are moved up and down. The intake manifold 9 and the exhaust manifold 10 are opened and closed (see also FIGS. 5 and 6).

Further, as shown in FIG. 7, the lubricating oil supplied to the sliding portion between the rocker shaft 1 and the rocker arm 3 and the sliding portion between the rocker arm 3 and the cam 5 is moved from the oil pan 11 through the main gallery 12 to the rocker. It flows into the lubricating oil supply passage 6 of the shaft 1. The arrows indicate the flow of lubricating oil.

Further, as shown in FIG. 2, one first oil hole 13 is formed in the rocker shaft 1 where the rocker arm 3 slides. Further, one second oil hole 14 is formed in the rocker shaft 1 near the rocker arm 3, that is, in the rocker shaft 1 where the sliding portion of the rocker arm 3 is removed. An opening / closing protrusion 16 for intermittently opening and closing the second oil 14 is formed on the side of the rocker arm 3 (FIGS. 1 and 3). An oil blow-out portion 15 formed of a through hole is formed in the intermediate portion of the opening / closing protrusion 14. In this case, the oil jet hole 4 conventionally provided in the rocker arm 3 will be abolished.

According to the present invention, since the first oil hole 13 is provided in the rocker shaft 1 in the portion where the rocker arm 3 slides as configured above, the resistance force of the sliding friction between the rocker shaft 1 and the rocker arm 3 slides. The oil film for reducing the oil can be formed by the lubricating oil sent from the first oil hole 13 between the rocker shaft 1 and the rocker arm 3. Further, the oil film for reducing the resistance force of the sliding friction between the rocker arm 3 and the cam 5 is formed by the lubricating oil blown from the oil blow-out portion 15 communicating with the second oil hole 14 provided in the rocker shaft 1. You can Although the oil outlet 15 provided on the opening / closing protrusion that intermittently opens / closes the second oil hole 14 of the rocker arm 3 is formed as a through hole, this is not the case, and the opening / closing protrusion is shown in FIG. It may be formed by cutting out a part of the one part. The operation is substantially the same as that of the oil blowout portion 15 formed by the through hole, and therefore the description thereof is omitted.

[0014]

[Effect of the device]

 As described above, the present invention can lubricate only the sliding portion of the cam and the rocker arm by the lubricating oil that blows out by communicating the second oil hole and the oil outlet, as in the conventional case. It is not necessary to supply a part of the oil film formed on the rocker shaft and the rocker arm to the sliding portion between the rocker arm and the cam. Therefore, it is possible to sufficiently secure the oil film in the sliding portion between the rocker arm and the rocker shaft without sending a large amount of lubricating oil. Further, there is also an effect that appropriate intermittent lubrication can be performed by changing the length of the opening / closing protrusion and the shape and number of the oil outlets.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a rocker arm and a rocker shaft according to an embodiment of the present invention.

FIG. 2 is a plan view of a rocker shaft.

FIG. 3 is an enlarged perspective view of a portion A of FIG.

FIG. 4 is a partial sectional side view of a rocker arm and a rocker shaft.

FIG. 5 is a schematic view of the vicinity of a rocker arm.

FIG. 6 is a plan view of FIG.

FIG. 7 is a perspective view showing a flow of lubricating oil of the engine.

FIG. 8 is a schematic plan view showing another embodiment of the present invention.

FIG. 9 is a schematic plan view showing a conventional rocker arm and a rocker shaft.

FIG. 10 is a plan view of a conventional rocker shaft.

FIG. 11 is a partial cross-sectional side view of a conventional rocker arm and rocker shaft.

[Explanation of symbols]

 1 Rocker shaft 3 Rocker arm 6 Lubricating oil supply path 13 1st oil hole 14 2nd oil hole 15 Oil blowout part 16 Opening / closing projection part

Claims (1)

[Scope of utility model registration request] 1. A rocker arm that slidably swings is provided orthogonally to a rocker shaft having a lubricating oil supply passage, a first oil hole is provided in a rocker shaft in a portion where the rocker arm slides, and the vicinity of the rocker arm is provided. Internal combustion engine characterized in that a second oil hole is formed in the rocker shaft, and an opening / closing protrusion having an oil blow-out portion is formed on a side portion of the rocker arm to open / close the second oil hole intermittently. Rocker arm.