JPH05149135A - Water pump of v-type-engine - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if cooling water leaks into the space between the bearing and the mechanical seal, it prevents the cooling water from deteriorating the belt, and also prevents sliding on bearings and other sliding parts. Prevents dust from adhering to improve the durability of the water pump. [Structure] A water pump 11 is attached to a V-type engine 1 having a pair of left and right banks arranged in a V shape. The water pump 11 includes a drive shaft 16 having an impeller 18,
The drive shaft 16 and the crankshaft are drivingly connected by a timing belt 8. And the impeller 18
By the rotation of the cooling water, the cooling water is pumped into both banks. An annular space 24 is formed between the bearing 15 that supports the drive shaft 16 and the mechanical seal 19 that prevents cooling water from leaking from the impeller 18 side to the bearing 15 side, and the annular space 24 and the left and right banks. A steam hole 25 and a water drain hole 27 that communicate with the valley portion 26 between them are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump for pumping cooling water cooled by a radiator into a V-type engine.

[0002]

2. Description of the Related Art Conventionally, as a technique of this type, there is one disclosed in Japanese Patent Laid-Open No. 62-93432.
In this technique, as shown in FIG. 5, in a cylinder block 31 of a V-type engine, a housing 33 of a water pump 32 is fixed at a substantially central position between both banks, and between the cylinder block 31 and the housing 33. A vortex chamber 34 is formed. Bearings 35 are provided in the housing 33.
The drive shaft 36 is rotatably supported via. A pulley 37 is attached to the front end (right end in FIG. 5) of the drive shaft 36, and an impeller 38 is attached to the rear end. A mechanical seal 39 is mounted between the housing 33 and the drive shaft 36 to prevent cooling water from leaking from the impeller 38 side to the bearing 35 side. When the pulley 37 is driven by the belt 40, the drive shaft 36 and the impeller 38 rotate, and the cooling water is pressure-fed to a water jacket (not shown) in the V-type engine. The housing 33, the belt 40, etc. are covered with a belt cover 41.

Further, in the water pump 32, since the sliding surface of the mechanical seal 39 is lubricated with cooling water to secure the sealing property, a minute amount of cooling water leaks through the sliding surface. I will end up. Therefore, in order to prevent the leaked cooling water from entering the bearing 35, an annular space 42 is provided between the mechanical seal 39 and the bearing 35, and the housing 33 includes an annular space 42 and a belt cover 41. A communication hole 43 for communicating with the belt cover 41 and a communication hole 44 for communicating with the outside of the belt cover 41 are provided. Then, the cooling water leaking into the annular space 42 and the steam of the cooling water are passed through the communication holes 43,
It is designed to be discharged from 44.

[0004]

However, in the above-mentioned prior art, since one communication hole 43 is opened in the belt cover 41 which covers the belt 40, the communication hole 43 is formed.
There is a possibility that the cooling water vapor discharged through the space may fill the sealed space inside the belt cover 41 and deteriorate the belt 40.

The other communication hole 44 is formed in the belt cover 4
Since it is open to the atmosphere outside 1, the sand, dust, and the like when the vehicle is traveling adheres to the communication hole 44 and is blocked, or passes through the communication hole 44 and enters the annular space 42, and the bearing 35, mechanical There is also a problem that the seal 39 adheres to a sliding portion or the like and reduces the durability of the water pump 32.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to prevent deterioration of the belt due to cooling water leaking into the space between the bearing and the mechanical seal,
It is an object of the present invention to provide a water pump for a V-type engine capable of preventing dust and the like from adhering to sliding parts of bearings and improving durability.

[0007]

In order to achieve the above object, the present invention is directed to cooling water by rotating an impeller attached to a V-type engine having a pair of banks arranged in a V shape and provided on a drive shaft. In a water pump of a V-type engine that pressure-feeds into the both banks, a space is formed between a bearing that supports the drive shaft and a mechanical seal that prevents cooling water from leaking from the impeller side to the bearing side. ,
A communication hole is provided to connect the space to the space between the two banks of the V-type engine.

[0008]

[Operation] When the V-type engine is operating, the impeller rotates,
By the rotation, the cooling water is pressure-fed into the both banks to perform cooling. When driving such a water pump, a very small amount of cooling water passes through the mechanical seal and leaks into the space between the bearing and the mechanical seal. The cooling water in this space remains in the liquid state or becomes steam,
It is discharged to the space between both banks in the V-type engine through the communication hole.

Therefore, even if the belt mounted on the water pump is covered with the belt cover, the cooling water in the liquid state or in the vapor does not fill the belt cover. In addition, between the V banks where the communication holes are opened,
Since it is covered with the intake system parts, etc., it is difficult for dust to enter.Therefore, this dust blocks the communication hole or enters the space between the bearing and the mechanical seal through the communication hole, and Adhesion is prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. As shown in FIG. 2, a crankshaft is rotatably supported by a cylinder block 2 of a V-type engine 1, and a crankshaft pulley 3 is attached to an end of the crankshaft.
Is installed. Also, the crankshaft pulley 3
A pair of left and right banks 4 arranged in a V shape above the
The camshafts are rotatably supported in the respective 5,
Camshaft pulleys 6 and 7 are attached to the ends of the camshafts. A timing belt 8 is wound around the crankshaft pulley 3 and both camshaft pulleys 6 and 7, and the crankshaft and both camshafts are drivingly connected via the timing belt 8.

A timing belt 8 is tensioned between the crankshaft pulley 3 and the left camshaft pulley 6 and between the crankshaft pulley 3 and the right camshaft pulley 7 to prevent tooth jumping. Idler pulleys 9 and 10 are attached.

Further, a water pump 11 driven by the timing belt 8 is attached at a substantially central position between the left and right banks 4 and 5. That is, as shown in FIGS. 1 and 3, a front wall 2a for connecting both left and right banks 4 and 5 to the front end of the cylinder block 2 of the V-type engine 1.
Are integrally formed, and the housing 12 of the water pump 11 is fastened and fixed to the front wall 2a with bolts 13. A vortex chamber 14 is provided between the front wall 2a and the housing 12.
Is formed, and the cooling water circulating in the cooling system is introduced into the vortex chamber 14. The vortex chamber 14 communicates with each water jacket (not shown) in both the left and right banks 4 and 5, and the cooling water introduced as described above is equally divided and led out to both water jackets.

A drive shaft 16 is rotatably supported on the boss portion 12a of the housing 12 via a bearing 15 such as a ball bearing. The front end of the drive shaft 16 (see FIG.
The left end) of the pulley 17 protrudes from the boss 12a, and the pulley 17 is integrally rotatably attached to the protruding portion. The pulley 17 has a bottomed cylindrical shape with an open rear surface.
2a is covered. The timing belt 8 is hung on the pulley 17 from the back side. Also, drive shaft 1
An impeller 18 is attached to the rear end of the unit 6 so as to be integrally rotatable. The impeller 18 includes a plurality of blades that extend radially around the drive shaft 16. Therefore, when the pulley 17 rotates, the drive shaft 16 and the impeller 18 rotate integrally, and the cooling water in the vortex chamber 14 is pumped toward both the left and right water jackets.

A mechanical seal 19 is mounted between the housing 12 and the drive shaft 16 to prevent leakage of cooling water from the impeller 18 side to the bearing 15 side.
As shown in FIG. 4, the mechanical seal 19 is attached to the outer periphery of the drive shaft 16 so as to be immovable in the axial direction, and is similarly attached to the outer periphery of the drive shaft 16 so as to be movable in the axial direction. And a driven ring 22. The sliding surface 20 between the seat ring 21 and the driven ring 22 seals the cooling water. The contact pressure between the rings 21 and 22 is applied by the spring 23.

As shown in FIG. 1, an annular space 24 having a predetermined length in the axial direction is formed between the housing 12, the drive shaft 16, the bearing 15 and the mechanical seal 19, and the mechanical seal 19 has a space. Cooling water leaking from the sliding surface 20 can enter the annular space 24. At the upper part of the housing 12 and the upper part of the front wall 2a of the cylinder block 2, steam holes 25 forming part of communication holes are formed.
Is provided. One end of the steam hole 25 is opened above the annular space 24, and the other end is opened on the rear surface of the front wall 2a. The valley portion 26 is a space between the annular space 24 and the left and right banks 4 and 5. And communicate with each other. Further, at the lower part of the housing 12 and the lower part of the front wall 2a of the cylinder block 2, a water drain hole 27 which is a communication hole together with the steam hole 25 is provided. One end of this drainage hole 27 is open to the lower portion of the annular space 24, and the other end is opened to the rear surface of the front wall 2a. The valley portion 26 between these annular space 24 and the left and right banks 4, 5 is formed. And communicate with each other.

A timing belt cover 28 is attached to the front portions of the left and right banks 4 and 5 to cover the housing 12 of the water pump 11, the timing belt 8 and the like to protect them from dust and the like.

Next, the operation and effect of this embodiment will be described. During operation of the V-type engine 1, the rotation of the crankshaft is transmitted through the timing belt 8 to the water pump 1.
1 is transmitted to the drive shaft 16, and the impeller 18 rotates with the rotation of the drive shaft 16, and the cooling water is pumped to the water jackets in the left and right banks 4 and 5.

When the water pump 11 is driven as described above, a small amount of cooling water passes through the sliding surface 20 of the mechanical seal 19 and leaks to the annular space 24 between the bearing 15 and the mechanical seal 19. A part of the cooling water that has entered the annular space 24 flows down and reaches the bottom of the annular space 24. Since the water drain hole 27 is opened at the bottom of the annular space 24, the cooling water is drained from this water drain hole 27.
The valley 2 between the left and right banks 4, 5 behind the front wall 2a
Guided to 6.

Further, a part of the cooling water that has entered the annular space 24 from the mechanical seal 19 becomes steam,
Attempts to fill the annular space 24. However, since the steam holes 25 are opened in the upper part of the annular space 24, the steam passes through the steam holes 25 from this opening and the front wall 2
a Guided to the valley 26 at the rear.

Therefore, the annular space 42 and the belt cover 4 are
Unlike the conventional technique in which the communication hole 43 that communicates with the inside of the timing belt cover 1 is provided, in this embodiment, the cooling water vapor does not fill the timing belt cover 28. Therefore, it is possible to prevent deterioration of the timing belt 8 due to the contact with the steam.

Further, the valley portion 26 in which the steam hole 25 and the water drain hole 27 are opened is covered with an intake system component or the like to prevent dust from entering therein. Therefore, dust adheres to the steam holes 25 and the water drain holes 27 and is blocked, and further passes through the steam holes 25 and the water drain holes 27 and the annular space 24.
It is possible to suppress the entry into the sliding part of the bearing 15 and the like. Therefore, it is possible to prevent defects caused by the dust, that is, adhesion and the like, and improve the durability of the water pump 11.

Further, in this embodiment, the water pump 11
The steam hole 25 and the water drain hole 27 are provided in the housing 12 and the front wall 2a of the cylinder block 2 to form a steam passage and a cooling water passage. Therefore, compared with the case where these passages are configured using separate members such as piping,
Not only the number of parts is small, but also the steam hole 25 and the water drain hole 27 can be easily routed and shortened, and the cost increase due to the provision of both holes can be suppressed to a low level.

The present invention is not limited to the configuration of the above-mentioned embodiment, and may be arbitrarily modified within the scope not departing from the spirit of the invention as follows. (1) In the above embodiment, one steam hole 25 and one water drain hole 27 were provided as communication holes, but one or three or more communication holes may be provided. (2) In the above-described embodiment, the water pump 11 is directly attached to the cylinder block 2. However, other than this, the water pump 11 may be attached to the timing belt cover 28.
It may be attached to the cylinder block 2 via the timing belt cover 28.

[0024]

As described in detail above, according to the present invention, a space is formed between the bearing that supports the drive shaft and the mechanical seal that prevents the leakage of cooling water from the impeller side to the bearing side. Since a communication hole that communicates the space with the space between both banks of the V-type engine was provided, leakage occurred into the space between the bearing and the mechanical seal with a simple structure without using new parts or the like. It is possible to prevent the deterioration of the belt due to the cooling water and prevent the adhesion of dust and the like to the sliding portion of the bearing or the like, thereby improving the durability.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a water pump for a V-type engine according to an embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement state of timing belts in a V-type engine according to an embodiment.

FIG. 3 is a perspective view of a cylinder block to which a water pump is attached, according to an embodiment.

FIG. 4 is an enlarged cross-sectional view of an annular space portion in one embodiment.

FIG. 5 is a cross-sectional view of a water pump showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... V-type engine, 4, 5 ... Bank, 11 ... Water pump, 15 ... Bearing, 16 ... Drive shaft, 18 ... Impeller, 1
9 ... Mechanical seal, 24 ... Annular space, 25 ... Steam hole as communication hole, 26 ... Valley as space between left and right banks, 27 ... Drainage hole as communication hole

Claims (1)

[Claims] 1. A water pump for a V-type engine, which is attached to a V-type engine having a pair of banks arranged in a V-shape, and which pumps cooling water into the banks by rotation of an impeller provided on a drive shaft. A space is formed between the bearing that supports the drive shaft and a mechanical seal that prevents leakage of cooling water from the impeller side to the bearing side, and the space and the space between both banks of the V-type engine are formed. A water pump for a V-type engine, which is provided with a communication hole for communication.