JPH05332118A - Lubricating device of engine - Google Patents

Abstract

PURPOSE:To prevent lubricating oil from mixing with blow-by gas by constituting a chain tensioner of an slidable part making contact with a drive chain and a plate part supporting the impulsive part, bending at least the upper portion of the plate part along the drive chain, providing a rib part on a chain cover and reducing mechanical loss. CONSTITUTION:An oil pump chain 32 and others are covered by a chain cover 46, and a rib part 48 is connectively provided roughly rectangularly with the chain cover 46. The rib part 48 is made roughly rectangular with a plate part 38 directed towards, for example, an upper portion 38a of the plate part 38 of a chain tensioner 34. By the upper portion 38a of the plate part 38 and the rib part 48, dropping lubricating oil is prevented from hitting the oil pump chain 32 and being stirred, and mechanical loss is reduced. Additionally, it is possible to prevent lubricating oil from mixing with blow-by gas and to reduce deterioration of oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating system for an engine, and more particularly, to lubricating oil which is smoothly guided into an oil pan and which can prevent falling lubricating oil from being agitated by a drive chain. Regarding the device.

[0002]

2. Description of the Related Art In an engine, a drive chain such as a timing chain or an oil pump chain that is interlocked with the rotation of a crankshaft is provided on the front side in order to drive a valve operating mechanism or an auxiliary machine such as an oil pump. It is provided. Since the drive chain is stretched and the like, its tension is kept constant by a chain tensioner or a chain guide or the like separately provided in the cylinder block or the like. Parts such as the drive chain arranged on the front side of these engines are
It is covered by a chain cover.

Lubricating oil is applied to the auxiliary machine and the drive chain by a lubricating device.

Such a lubricating device is disclosed, for example, in Japanese Utility Model Laid-Open No. 1-93312. The structure described in this publication is a V-type engine in which a suction passage and a discharge passage are formed in a cylinder block, and the discharge oil passage is connected to a lubricating oil main passage at the rear of the engine.

[0005]

However, the lubricating oil that lubricates each part by the cylinder head of the engine, etc. drops in the chain cover and returns to the oil pan. At this time,
This lubricating oil hits the drive chain, which hinders the lubricating oil from falling and the lubricating oil does not return smoothly into the oil pan.

Further, since the lubricating oil is agitated by the drive chain, mechanical loss (mechanical loss) increases, and the lubricating oil is easily mixed in the blow-by gas, and moreover,
There is an inconvenience that the lubricating oil easily deteriorates.

[0007]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides a chain tensioner for adjusting the tension of the drive chain that is interlocked with the rotation of the crankshaft. In an engine provided with a chain cover for covering a drive chain, the chain tensioner comprises a sliding portion in contact with the drive chain and a plate portion supporting the sliding portion, and at least an upper portion of the plate portion is the drive chain. And a rib portion directed to the chain tensioner side is provided on the chain cover.

[0008]

According to the structure of the present invention, a wall is formed above the drive chain by at least the upper portion of the plate portion of the chain tensioner and the rib portion of the chain cover, so that the lubricating oil that falls falls outside the drive chain. Since the lubricating oil does not come into direct contact with the drive chain and is smoothly returned to the oil pan, the lubricating oil does not hit the drive chain, reducing mechanical loss and causing the lubricating oil to blow-by gas. It is possible to prevent the oil from being mixed in and to prevent the lubricating oil from being deteriorated.

[0009]

Embodiments of the present invention will now be described in detail and specifically with reference to the drawings. 1 and 2 show a first embodiment of the present invention. In FIG. 1, 2 is a V-type engine, 4 is a cylinder block, 6 is a crank bearing cap, 8 is an oil pump as an auxiliary machine, and 10 is an oil pan.

A crankshaft 12 is pivotally supported by the cylinder block 4 and the crank bearing cap 6. A timing chain sprocket 14 and an oil pump chain sprocket (not shown) that overlaps with the timing chain sprocket 14 are provided at the front end portion of the crankshaft 12.

An oil pump holder 16 is fixedly installed at a lower portion of the crank bearing cap 6. An oil pump holding cap 20 that pivotally supports the oil pump shaft 18 is fixedly attached to the lower portion of the oil pump holding body 16 by mounting bolts 22 and 22.

The oil pump 18 is provided with an oil pump sprocket 24.

An oil suction pipe 28 having an oil strainer 26 on the tip side is connected to the oil pump 8. The oil strainer 26 is located at the bottom of the oil pan 10.

The timing chain sprocket 14
A timing chain 30, which is a drive chain for rotating a cam shaft (not shown) of the valve gear, is wound around the shaft.

An oil pump chain 32, which is a drive chain, is wound around the oil pump chain sprocket and the oil pump sprocket 24 described above.

The oil pump chain 32 is held and guided at a constant tension by, for example, a chain tensioner 34 in contact with the outer surface on the upper right side in FIG.

As shown in FIG. 1, the chain tensioner 34 is arranged above the oil pump 8 between an oil pump chain sprocket (not shown) and the oil pump sprocket 24.

The chain tensioner 34 is, as shown in FIG. 2, an oil pump chain 32 which is a drive chain.
And a plate portion 38 that supports the sliding portion 36.

A plate fixing member 40 is connected to the plate portion 38, as shown in FIG. The plate fixing member 40 has an upper end on the upper support bolt 4 side.
The lower end is supported by the lower support bolt 44 while being supported by the second support bolt 44. The upper and lower support bolts 42 and 44 are attached to the side surface of the crank bearing cap 6. At this time, the plate portion 38 is positioned with a small clearance from the side surface of the crank bearing cap 6 (see FIG. 2).

As shown in FIG. 2, the upper portion 38a of the plate portion 38 is bent along the oil pump chain 32. Thereby, the plate portion 38
Is formed to have an L-shaped cross section as shown in FIG.

As shown in FIG. 2, the parts such as the oil pump chain 32 are covered with a chain cover 46 for maintaining the function and safety.

As shown in FIG. 2, the chain cover 46 includes, for example, a plate portion 38 of the chain tensioner 34.
A rib portion 48 is continuously provided at a right angle to the chain cover 46 and at a right angle to the plate portion 38 so as to face the upper portion 38a side. In FIG. 2, the rib tip surface 48a of the rib portion 48 is slightly separated from the upper portion 38a of the plate portion 38.

Therefore, the upper portion 38a of the plate portion 38 and the rib portion 48 form a wall on the outer side above the oil pump chain 32, and prevent the falling lubricating oil from hitting the oil pump chain 12. It is a composition.

Next, the operation of the first embodiment will be described.

In FIG. 2, the lubricating oil falling from above is guided to the outside of the oil pump chain 32 by the wall formed by the upper portion 38a of the plate portion 38 of the chain tensioner 34 and the rib portion 48, so that the lubricating oil is lubricated. The oil does not hit the oil pump chain 32 directly,
As a result, the lubricating oil can be smoothly returned to the oil pan 10 and the oil level change in the oil pan 10 can be reduced.

Further, the lubricating oil is the oil pump chain 32.
Since it is not agitated by, it is possible to reduce mechanical loss (mechanical loss), prevent lubricating oil from mixing in the probe gas, and reduce oil deterioration.

Further, since the plate portion 38 is formed in an L-shaped cross section, the strength of the chain tensioner 34 can be improved.

Furthermore, the plate portion 38 and the rib portion 48
Since the lubricating oil can be guided to the outside of the oil pump chain 32 only by itself, the structure is simple and the increase in the number of parts can be prevented.

In the first embodiment, as shown in FIG. 3, the upper portion 38a and the lower portion 3 of the plate portion 38 are formed.
It is also possible to bend 8b along the oil pump chain 32 and form the plate portion 38 in a U-shaped cross section.

According to the structure of the chain tensioner 34 shown in FIG. 3, the lubricating oil can be positively guided even in the lower portion 38b of the plate portion 38, and
The strength of the chain tensioner 34 can be further improved.

Further, as shown in FIG. 4, the chain cover 4
6 is directed toward the sliding portion 36 side, and the rib tip end surface 48a of the rib portion 48 is directed toward the side surface 36a of the sliding portion 36.
It is also possible to provide it in contact with.

According to the construction of FIG. 4, since no gap is formed between the rib portion 48 and the chain tensioner 34, it is possible to effectively prevent the lubricating oil from flowing out to the oil pump chain 32 side. ..

FIG. 5 shows a second embodiment of the present invention.

In the second embodiment, the parts having the same functions as those in the first embodiment will be designated by the same reference numerals.

The feature of this second embodiment is that the chain tensioner 34 is constructed in the same manner as in the first embodiment described above, and the extension 34D below the chain tensioner 34 is connected to the oil pump sprocket 24 and The point is that the oil pump chain 32 extends from above so that it is completely covered.

According to the structure of the second embodiment, the lubricating oil guided by the upper portion 38a of the plate portion 38 and the rib portion 48 falls while avoiding the oil pump sprocket 24 and the oil pump chain 32. Since the oil is not agitated by the oil pump chain 32 or the like, the lubricating oil can be guided into the oil pan 10 more smoothly, and mechanical loss and the like can be further reduced.

Although the oil pump chain 32 has been described in the above embodiment, the chain tensioner 34 can be similarly provided for the timing chain 30 and other auxiliary machine chains.

[0038]

As is apparent from the above detailed description, according to the present invention, the chain tensioner is composed of the sliding portion in contact with the drive chain and the plate portion supporting the sliding portion, and at least the upper portion of the plate portion. Is bent along the drive chain, and the chain cover has ribs that point toward the chain tensioner, so that the upper part of the plate on the chain tensioner and the ribs on the chain cover make A wall is formed on the drive chain, which guides the falling lubricating oil to the outside of the drive chain, preventing the lubricating oil from directly hitting the drive chain and returning the lubricating oil to the oil pan smoothly. Since it does not hit, it reduces mechanical loss and prevents lubricating oil from mixing in blow-by gas,
Moreover, the lubricating oil can be prevented from deteriorating.

[Brief description of drawings]

FIG. 1 is a partial front view of a lubricating device for an engine according to a first embodiment.

2 is a cross-sectional view of the engine lubrication device taken along line 〓-〓 in FIG.

FIG. 3 is a cross-sectional view of a lubricating device for an engine according to a modified example of the first embodiment.

FIG. 4 is a cross-sectional view of an engine lubrication device of another modification of the first embodiment.

FIG. 5 is a partial front view of a lubricating device for an engine according to a second embodiment.

[Explanation of symbols]

 2 engine 4 cylinder block 8 oil pump 32 oil pump chain 34 chain tensioner 36 sliding part 38 plate part 46 chain cover 48 rib part

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[Procedure amendment]

[Submission date] July 16, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 1]

[Figure 5]

Claims (1)

[Claims] 1. A chain tensioner for adjusting the tension of a drive chain that is interlocked with the rotation of a crankshaft,
In an engine provided with a chain cover that covers the chain tensioner and the drive chain, the chain tensioner includes a sliding portion that is in contact with the drive chain and a plate portion that supports the sliding portion, and at least an upper portion of the plate portion. A lubricating device for an engine, wherein a portion is provided by bending along the drive chain, and a rib portion directed to the chain tensioner side is provided on the chain cover.