JPH0539718A - Bearing lubrication device of water pump - Google Patents

Abstract

PURPOSE:To improve the lubrication efficiency of a water pump bearing and prevent its seizure by slantly providing a lubrication hole part which leads from the case outer face of a water pump to the water pump bearing, and providing a projecting part on a case so as to direct oil toward the lubrication hole part. CONSTITUTION:A lubrication hole part 54 which leads from the outer face of the case 40 of a water pump 34 to a water pump bearing 46 is provided slantly backward in relation to the rotational direction so as to provide a specific angle in relation to the water pump bearing 46. A projecting part 58 to direct oil to the lubrication hole part 54 is provided in the case 40 on the front side from the flow-in port 56 of the oil in the lubrication hole part 54, in relation to the rotational direction. The oil can be forced to flow in the lubrication hole 54, and the lubrication efficiency of the water pump bearing is improved. Continuous oil supply can be surely performed so as to prevent any seizure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing lubrication device for a water pump, and more particularly, it is mounted on a drive source such as an internal combustion engine and transmits the rotational force from the drive source to an impeller through a water pump bearing by a power transmission means. The present invention relates to a bearing lubrication device for a water pump that allows the pump to exert its pump function.

[0002]

2. Description of the Related Art A water pump is mounted on, for example, an internal combustion engine of a vehicle, and a rotational force from the internal combustion engine is transmitted to an impeller through a water pump bearing by a power transmission means such as a timing belt, a V-belt, a gear or a chain. Then, the pump function is exerted to circulate the cooling water for the internal combustion engine.

When a timing belt or a V-belt is used as the drive system for the water pump, grease is used to lubricate the water pump bearing. That is, as shown in FIG. 4, the case 1 of the water pump 134 is
40 is provided with a supply hole 170, grease is supplied between the water pump bearings 146-1 and 146-2 in the case 140, and the supply hole 170 is closed by a plug 172 to seal the grease.

Reference numeral 160 is the water pump 13.
There are 4 water chambers.

There is also a water pump drive system using gears and chains. This drive type is
The drive system oil is used for lubrication of the water pump bearing, and the oil is supplied by gravity.

A bearing lubrication device for the water pump is disclosed in Japanese Utility Model Laid-Open No. 63-190519. The water pump disclosed in this publication supports a rotating shaft of the water pump by a slide bearing, and provides a passage for supplying lubricating oil from an oil pump which circulates lubricating oil to an engine to a bearing portion of the sliding bearing.

Further, there is one disclosed in Japanese Utility Model Laid-Open No. 64-53523. The bearing lubrication device for an engine cooling water circulation pump disclosed in this publication is provided with a pair of front and rear bearings that support a rotating shaft of a cooling water circulation pump in an engine, and an oil gallery from an oil gallery to a bearing chamber between these bearings. A lubricating oil supply pipe for supplying lubricating oil is provided, and a lubricating oil discharge pipe for discharging the lubricating oil from the bearing chamber is provided. An inclined bypass passage for preventing retention that is inclined with respect to the axial direction is provided.

Further, there is one disclosed in Japanese Utility Model Laid-Open No. 64-53524. The bearing lubrication device for an engine cooling water circulation pump disclosed in this publication is provided with a pair of front and rear bearings that support a rotating shaft of a cooling water circulation pump in an engine, and an oil gallery from an oil gallery to a bearing chamber between these bearings. A lubricating oil supply pipe for supplying lubricating oil is provided, a lubricating oil discharge pipe for discharging lubricating oil from the bearing chamber is provided, and a spiral groove for circulating a swirling flow of the lubricating oil is provided on an inner wall of the bearing chamber.

[0009]

By the way, in the conventional bearing lubrication device for the water pump, the grease filling type uses the grease in the oil atmosphere, and there is a fear that the grease may flow out into the oil atmosphere. There is an inconvenience that there is a practical disadvantage.

Further, in the case where the oil of the drive system is supplied by gravity, it must be used under various conditions such as lateral G (gravitational force), acceleration G, deceleration G, etc. depending on the running of the vehicle. However, the oil supply is intermittent, the continuous and accurate oil supply is not achieved, and problems such as seizure occur.

[0011]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention relates to a water pump in which the rotational force by the power transmission means is transmitted to the impeller through the water pump bearing and functions as a pump. A lubricating hole communicating from the outer surface of the case of the water pump to the water pump bearing is provided so as to be inclined rearward with respect to the rotation direction so as to have a predetermined angle with respect to the water pump bearing, and the oil flow in the lubricating hole flows. A ridge is provided in the case on the front side of the inlet with respect to the rotation direction so as to direct the oil to the lubricating hole.

[0012]

According to the invention as described above, when the water pump is driven, a swirl flow is generated in the oil by the rotational force, and the swirled oil is forcibly flown into the lubrication hole portion from the inflow port, and the raised portion As a result, the inflow efficiency of the oil from the inlet is improved, the lubrication efficiency is improved, the continuous supply of oil is reliably achieved, and seizure is prevented.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3 show an embodiment of the present invention. In FIG. 2, 2 is, for example, an internal combustion engine, and 4 is a cylinder block.

On the front wall 6 of the cylinder block 4, a crank journal portion 8 of a crankshaft (not shown) oriented in the front-rear direction of the internal combustion engine 2 is rotatably provided.

A two-cam shaft (not shown) is rotatably provided on a cylinder head (not shown), and a cam shaft sprocket (not shown) is provided in the same plane on the front side of the internal combustion engine 2 of the cam shaft. ing. A timing chain sprocket 10 is fixed to the end portion of the crank journal portion 8 of the crankshaft within the same plane of the camshaft sprocket.

At the end of the crank journal portion 8 of the crankshaft, first and second auxiliary equipment drive crank pulleys 12 and 14 are provided at the endmost portions.

A belt 16 for an alternator is wound around the crank pulley 12 for driving the first auxiliary machine. Further, the alternator belt 16 is wound around an alternator pulley (not shown) of an alternator (not shown) which is one of auxiliary machines installed on the upper part of the internal combustion engine 2.

A fan belt 18 is wound around the second accessory drive pulley 14. The fan belt 18 is wound around the fan pulley 20. The fan pulley 20 is fixed to a fan support 24 fixed to a fan shaft 22 that is axially supported on the front surface of the cylinder block 4. A cooling fan 26, which is one of auxiliary machines, is fixedly installed on the fan shaft 22 and the fan support 24.

Further, an oil pump driving sprocket 28 is fixedly provided at an end portion of the crankshaft between the crank journal portion 8 and the timing chain sprocket 10, and the oil pump driving sprocket 28 has an oil pump chain (not shown). Wrap around. An oil pump sprocket 30 of an oil pump (not shown) is arranged in the same plane of the oil pump chain, and the oil pump chain is wound around the oil pump sprocket 30.

Furthermore, in order to drive the water pump 34 by the timing chain 32 which is a power transmission means, the water pump sprocket 36 of the water pump 34 is arranged in the same plane as the timing chain 32 and the timing chain 32 is arranged. The water pump 34 is provided above the front wall 6 which is the end surface of the cylinder block 4 in the surrounding timing chain cover 38.

The water pump 34 has a case 40.
And an impeller 42, a shaft body 44 connecting the impeller 42 and the water pump 34, and a water pump bearing 46.

The water pump sprocket 36 of the water pump 34 is provided so as to be located in the same plane with respect to the camshaft sprocket and the timing chain sprocket 10.

A single timing chain 32 is wound around the camshaft sprocket fixed to the camshaft and the water pump sprocket 36 of the water pump 34.

The timing chain 32 is held at a predetermined tension by a tensioner (not shown).

These timing chain 32, camshaft sprocket, and water pump sprocket 3
6 is surrounded by a timing chain cover 38.

The water pump 34 has a mounting hole 48 for the water pump 34 of the cylinder block 4.
Is connected to a cooling water pipe (not shown).

Reference numeral 50 is a first drainage hole formed in the case 40 of the water pump 34, and 52 is a second drainage hole formed in the timing belt cover 38 and connected to the first drainage hole 50. It is a department.

The lubricating hole portion 54 communicating with the water pump bearing 46 from the outer surface of the case 40 of the water pump 34 is inclined rearward with respect to the rotation direction so as to form a predetermined angle with respect to the water pump bearing 46. In addition, the raised portion 5 is provided in the case 40 on the front side of the oil inlet 56 of the lubricating hole 54 with respect to the rotation direction in order to direct the oil to the lubricating hole 54.
8 is provided.

More specifically, as shown in FIGS. 1 and 3, the inflow port 5 of the lubricating hole portion 54 with respect to the vertical center line C of the case 40.
6 is moved to the rear side with respect to the rotation direction, that is, in the clockwise direction in FIG. 3, and the lubrication hole portion 54 is inclined by an angle θ.

The raised portion 58 is located in front of the inlet 56 of the lubricating hole 54 in the rotational direction, that is, in FIG.
It is formed at a position moved in the counterclockwise direction.

Reference numeral 60 is a water chamber of the water pump 34, and 62 is an oil atmosphere portion of the water pump 34.

Next, the operation will be described.

When the internal combustion engine 2 is driven, the first and second accessory drive pulleys 12 and 14 are rotated together with the rotation of a crankshaft (not shown) of the internal combustion engine 2.
The alternator belt 16 drives an alternator (not shown), the fan belt 18 rotates the cooling fan 26, the timing chain 32 rotates the camshaft, the water pump 34 is driven, and the oil pump chain (not shown). The oil pump is driven.

At this time, as shown in FIG. 3, the oil is directed along the water pump sprocket 36 by the rotation of the water pump sprocket 36 by the counterclockwise drive of the water pump 34, that is, in the counterclockwise direction. An eddy current is generated.

The oil in which the vortex flow is generated is introduced into the inflow port 5
6 forcibly flows into the lubrication hole 54 to lubricate the water pump bearing 44.

Further, the raised portion 58 contributes to the inflow of oil from the inflow port 54, and further enhances the inflow efficiency.

As a result, the oil can be forced to flow into the lubricating hole portion 52 which is inclined by the angle θ so as to facilitate the inflow of oil, and the water is used as compared with the conventional one using gravity. Lubrication efficiency of the pump bearing 44 can be improved, continuous supply of oil can be reliably achieved, and seizure can be prevented, which is practically advantageous.

Further, as compared with the conventional one using the grease-filled type, by using the open type bearing structure, the structure is simplified, the manufacture is easy, the cost can be reduced, and it is economical. Is advantageous.

Further, by directing the oil toward the inflow port 56 of the lubrication hole 54 by the raised portion 58, it contributes to the improvement of the inflow efficiency of the oil from the inflow port 56, and further enhances the lubricating efficiency. Is something that can be done.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, in the embodiment of the present invention, the sprocket and the chain are used when transmitting the rotational force to the water pump, but any structure capable of transmitting the rotational force to the water pump may be used, and the gear structure may be used. It is also possible to

In the embodiment of the present invention, the water pump is attached to the internal combustion engine and the driving force of the internal combustion engine is used as the rotational force. However, other driving sources may be used. it can.

[0044]

As described in detail above, according to the present invention, the lubricating hole portion which communicates with the water pump bearing from the outer surface of the case of the water pump is formed in the rotational direction so as to have a predetermined angle with respect to the water pump bearing. In addition to being provided on the rear side in a tilted manner, the case on the front side with respect to the direction of rotation of the oil inlet of the lubrication hole has a raised portion to direct the oil to the lubrication hole, so Oil can be forced to flow in, and the lubrication efficiency of the water pump bearing can be improved compared to the conventional one using gravity, so that continuous supply of oil can be reliably achieved and seizure can be prevented. Therefore, it is practically advantageous. In addition, compared to the conventional one using the grease-filled type, by using the open type bearing structure,
It has a simple structure, is easy to manufacture, can be manufactured at low cost, and is economically advantageous. Further, by directing the oil toward the inflow port of the lubrication hole by the raised portion, it contributes to the improvement of the inflow efficiency of the oil from the inflow port, and the lubricating efficiency can be further enhanced.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of a water pump taken along the line 〓-〓 of FIG. 3 showing an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a water pump portion of an internal combustion engine.

FIG. 3 is a schematic sectional view of a water pump mounting portion.

FIG. 4 is a schematic cross-sectional view of a water pump showing a conventional technique of the present invention.

[Explanation of symbols]

 2 Internal Combustion Engine 4 Cylinder Block 10 Timing Chain Sprocket 12 First Auxiliary Drive Crank Pulley 14 Second Auxiliary Drive Crank Pulley 20 Fan Pulley 26 Cooling Fan 28 Oil Pump Drive Sprocket 30 Oil Pump Sprocket 32 Timing Chain 34 Water Pump 36 Water pump sprocket 38 Timing chain cover 40 Case 42 Impeller 44 Shaft body 46 Water pump bearing 48 Mounting hole portion 50 First drainage hole portion 52 Second drainage hole portion 54 Lubrication hole portion 56 Inlet port 58 Raised portion 60 Water Chamber 62 Oil atmosphere part

Claims (1)

[Claims] 1. In a water pump that functions as a pump by transmitting the rotational force of a power transmission means to an impeller via a water pump bearing, the water pump is provided with a lubrication hole portion that communicates with the water pump bearing from the outer surface of the case of the water pump. It is provided so as to be inclined rearward with respect to the rotation direction so as to have a predetermined angle with respect to the pump bearing, and oil is lubricated in a case forward of the oil inlet of the lubrication hole in the rotation direction. A bearing lubrication device for a water pump, wherein a raised portion is provided so as to be directed toward the hole.