JPH07189638A - Lubricating oil inducing device for engine - Google Patents

Abstract

PURPOSE:To avoid various faults in respective parts of an engine by preventing generation of bubbles in the lubricating oil in an oil pan. CONSTITUTION:In an engine which is formed in such constitution that an oil pump drive sprocket 6 is provided on the end part of a crank shaft 5 which is rotatably maintained to a cylinder block 1 and a chain 9 is engaged with the oil pump drive sprocket 6 and the sprocket 8 of an oil pump 3 provided in an oil pan 4, a rib 13 for covering an engaging part A is formed upward the engaging part A of the chain 9 and the oil pump driving sprocket 6. The rib 13 is formed integratedly with a cylinder block 1 and a crank case 2. It is thus possible to drop lubricating oil which falls down from the upper part of the cylinder block 1 onto an oil pan 4 along the outer circumference of the rib 13 without being directly colliding with the oil pump drive sprocket 6 and/or the chain 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil guide device for an engine provided so as to cover an engagement portion between an oil pump drive sprocket provided on a crankshaft of an engine and a chain from the oil pump.

[0002]

2. Description of the Related Art An automobile engine is provided with an oil pump for supplying lubricating oil to each moving part such as a crankshaft. This oil pump is usually attached to the lower part of the crankcase and is rotated by the driving force of the crankshaft. The installation of this oil pump will be described below based on the oil pump drive system shown in FIG.

In FIG. 4, a crankcase 2 is provided below the cylinder block 1, and an oil pump 4 is mounted inside an oil pan 3 below the crankcase 2.

A crankshaft 5 is provided on the cylinder block 1, and an oil pump drive sprocket 6 is attached to an end of the crankshaft 5. On the other hand, a sprocket 8 is also attached to the drive shaft 7 of the oil pump 4, and a chain 9 is stretched over the sprocket 8 and the oil pump drive sprocket 6.

Therefore, the oil pump drive sprocket 6 drives the sprocket 8 of the oil pump 4 by the chain 9 (the rotation direction is clockwise).

The reference numeral 10 indicates an oil pump 4.
It is a chain guide arranged along the chain 9 for driving. Chain guide 10 is crankcase 2
It is fixed to the oil pump 4 to suppress the swing of the chain 9 and guide the lubricating oil falling from the timing chain 11 and the like to the oil pan 3.

As a lubricating device for an internal combustion engine,
Some are disclosed in Japanese Patent Publication No. 59-81715. The one disclosed in this publication is provided with an oil guide plate that covers the timing chain below the camshaft on the rising side of the internal combustion engine, and places the falling end of this guide plate in a position where lubricating oil is not applied to the timing chain on the rising side. It is provided.

[0008]

In the prior art described above, the lubricating oil falling from above the timing chain or the like is applied to the engagement portion between the oil pump drive sprocket and the chain (see symbol A in FIG. 4). Since they collide with each other, when they fall into the oil pan, there is a problem that considerable bubbles are generated in the lubricating oil.

When the lubricating oil containing a large amount of bubbles is supplied from the oil pump to each part of the engine as described above, various problems occur. For example, there has been a problem that the crankshaft and connecting rod bearing are seized, and the hydraulic tappet malfunctions, resulting in deterioration of lubricating performance and durability.

As a countermeasure for this, the oil pan is deepened or a baffle plate is attached, but this causes a problem that the engine becomes large and the number of parts and weight increase.

In the lubricating device for an internal combustion engine disclosed in Japanese Utility Model Laid-Open No. 59-81715, a guide plate has a falling end provided above, and the lubricating oil that falls falls apart from a guide guide. Some air bubbles may be included.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The cylinder block and the crankcase are provided with ribs for covering the engagement portions of the oil pump drive sprocket and the chain, thereby increasing the size and It is an object of the present invention to provide a lubricating oil guide device for an engine, which suppresses the generation of bubbles in the lubricating oil without increasing the number of parts and avoids various problems in each part of the engine.

[0013]

As a means for solving the above problems, the present invention provides an oil pump drive sprocket at the end of a crank shaft rotatably held by a cylinder block, and the oil pump drive sprocket is provided. In the engine in which the chain is engaged with the sprocket of the oil pump provided in the oil pan, a rib covering the engaging part is formed above the engaging part of the chain and the oil pump drive sprocket, It is characterized by being integrally molded with the cylinder block and the crankcase.

[0014]

As described above, according to the present invention, since the rib for covering the engagement portion between the chain from the oil pump and the oil pump drive sprocket is provided at the upper portion of the oil pump drive sprocket, it is possible to drop from the upper portion of the cylinder head or the like. The coming lubricating oil can be dropped along the outer circumference of the rib into the oil pan without directly colliding with the oil pump drive sprocket or the chain.

Further, since the rib is formed integrally with the cylinder block and the crankcase, the engine can be easily implemented in the conventional space without increasing the size.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In the figure, the reference numeral 1 is a cylinder block of the engine 12, and the reference numeral 2 is a crankcase below the cylinder block 1.

A crankshaft 5 is rotatably provided on the cylinder block 1, and an oil pump drive sprocket 6 is attached to an end of the crankshaft 5.
An oil pump 4 is provided inside the oil pan 3 below the crankcase 2.

A sprocket 8 is provided on the drive shaft 7 of the oil pump 4, and a chain 9 is hung on the sprocket 8 and the oil pump drive sprocket 6.

As a result, when the oil pump drive sprocket 6 rotates, the chain 9 rotates the sprocket 8 to drive the oil pump 4. The direction of rotation is clockwise.

A chain guide 10 is arranged on the side of the chain 9 along the chain 9. The chain guide 10 is fixed to the crankcase 2 and the oil pump 4 to prevent the chain 9 from swinging.

Further, a rib 13 integrally formed with the cylinder block 1 and the crankcase 2 is provided on the outer periphery of the upper portion of the engagement portion A between the oil pump drive sprocket 6 provided on the crankshaft 5 and the chain 9 from the oil pump 4. It is attached so as to cover the engaging portion A.

In FIG. 2, a crankshaft sprocket 14 is inserted in the crankshaft 5, and a timing chain 11 of a valve drive system for driving the camshaft is engaged with the sprocket 14 (FIG. 3). reference).

Further, a crank pulley 15 is inserted in front of the crankshaft sprocket 14 of the crankshaft 5. The crank pulley 15 and the sprocket 14 are held by bolts 16.

Hydraulic adjusters 19 and 20 are attached to the cylinder block 1 and the cylinder head 18 to apply a constant tension to the timing chain 11.

In the present embodiment, as described above, the rib 13 for covering the engaging portion A is provided above the engaging portion A between the chain 9 hung on the oil pump 4 and the oil pump drive sprocket 6. Therefore, the lubricating oil that drops from the top of the cylinder head 18, the hydraulic adjusters 19 and 20, etc., is removed from the oil pump drive sprocket 6 and the chain 9
It is possible to drop the oil along the outer circumference of the rib 13 into the oil pan 3 without directly colliding with the oil (see symbol B in FIG. 1).

A part of the lubricating oil that drops falls on the chain guide 10
And falls into the oil pan 3 (see reference numeral C in FIG. 1). Since it did in this way, it becomes possible to reduce the bubbles of the lubricating oil in the oil pan 3 compared with the past.

Further, since the rib 13 is formed integrally with the cylinder block 1 and the crankcase 2, the engine 12 can be easily implemented in the conventional space without increasing the size.

[0028]

Since the present invention is configured as described above, the lubricating oil falling from the upper portion of the cylinder head or the like can be applied to the outer periphery of the rib without directly colliding with the oil pump drive sprocket or chain. It can be dropped along the way into an oil pan. Thereby, the bubbles of the lubricating oil in the oil pan are reduced, and the lubrication performance of each part of the engine can be improved and the durability can be improved.

Since the rib is formed integrally with the cylinder block and the crankcase, the engine can be easily implemented in the conventional space without increasing the size. As a result, the number of parts does not change from the conventional one, and the increase in weight can be suppressed.

[Brief description of drawings]

FIG. 1 is a front view of an oil pump drive system showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view taken along the line DD of FIG.

FIG. 3 is a front view showing a timing chain of the engine.

FIG. 4 is a front view of a conventional oil pump drive system.

[Explanation of symbols]

 1 Cylinder Block 2 Crank Case 3 Oil Pan 4 Oil Pump 5 Crank Shaft 6 Oil Pump Drive Sprocket 8 Sprocket 9 Chain 12 Engine 13 Rib A Engagement Part

Claims (1)

[Claims] 1. An oil pump drive sprocket is provided at an end of a crankshaft rotatably held by a cylinder block, and a chain is engaged with the oil pump drive sprocket and an sprocket of an oil pump provided in an oil pan. In the engine described above, a rib for covering the engaging portion of the chain and the oil pump drive sprocket is formed on an upper portion of the engaging portion, and the rib is formed integrally with the cylinder block and the crankcase. Oil induction device.