JPH11210463A - Water pump for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent moistures from entering the atmosphere of oil while making an engine compact. SOLUTION: In a water pump for an engine which incorporates an impeller 5 in a dead space 4 of the front end part of a cylinder block 5, a cooling water leakage discharge passage 27 and a steam leakage discharge passage 25 are formed in the dead space 4, the outlet 28 of the cooling water leakage discharge passage 27 is opened to a side surface of the dead space, and the outlet 26 of the steam leakage discharge passage 25 is opened to the upper surface of the dead space.

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 an engine for cooling by circulating cooling water through a cylinder block and a cylinder head of the engine.

[0002]

2. Description of the Related Art In a water-cooled engine, cooling water is pressurized by a water pump, flows from a cylinder block through a cylinder head to a radiator, and is then sucked into the water pump again. .

[0003] In recent years, demands for downsizing and compactness of engines have been increasing more and more, and there has been a demand for rationally laying out each member constituting the engine.

Therefore, for example, in a V-type engine,
JP-A-5-179945 discloses a structure in which a water pump and a cooling water introduction path are formed in a bank offset space serving as a dead space to shorten the entire length of an engine.

[0005] As shown in FIG.
Is provided with an impeller 53 connected to the rotating shaft 52, and a cooling water introduction passage 54 is formed in the bank offset space so as to communicate with the impeller 53. The cooling water flowing from the radiator is pressurized by the impeller 53 and flows through the cooling water outflow passage 60 toward the cylinder block 55. The rotating shaft 52 of the water pump 51 is configured so that the rotating force of the crankshaft is transmitted via a belt and rotates.

Since the rotating shaft 52 is provided so as to span the rotation driving unit 56 and the impeller 53 through which the cooling water flows, a mechanical seal is provided to prevent the cooling water from flowing to the rotation driving unit 56. 57 are formed. However, the mechanical seal 57 is configured so that a small amount of cooling water or water vapor leaks to the rotation drive unit 56 side for noise reduction or the like. Therefore, a cooling water leak discharge path 58 and a water vapor leak discharge path 59 are formed to discharge the leaked cooling water and water vapor.

[0007]

In the above-mentioned prior art, the cooling water leak discharge path 58 and the water vapor leak discharge path 59 are formed so as to open to a space in front of the water pump 51, and are provided on the belt side. The cooling water and steam are discharged.

However, when the rotating shaft 52 of the water pump 51 is driven via a chain or a gear instead of a belt, the space in front of the water pump 51 becomes an oil atmosphere in order to drive the chain and the like. If cooling water or water vapor is discharged into this space, water is undesirably mixed into the oil atmosphere.

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a water pump for an engine that prevents the entry of water into an oil atmosphere while reducing the size of the engine. Is to provide.

[0010]

In order to solve the above-mentioned problems,
The present invention relates to a water pump for an engine having an impeller built in a dead space at a front end portion of a cylinder block, wherein a cooling water leak discharge path is formed in the dead space, and an outlet of the leak discharge path is connected to the dead space. It is an opening on the side surface.

A water pump for an engine having an impeller built in a dead space at a front end of a cylinder block, wherein a water vapor leak discharge path is formed in the dead space, and an outlet of the leak discharge path is connected to the dead space. Is opened on the upper surface of the substrate.

According to the above structure, the engine can be made more compact, and the leaked cooling water and water vapor are discharged not to the portion of the oil atmosphere where the chain is located but to the side or upper surface of the cylinder block. Therefore, the entry of water into the oil atmosphere can be prevented.

The dead space may be caused by a bank offset of the V-type engine.

[0014]

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

FIG. 1 is a right vertical sectional view showing an embodiment of an engine water pump according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a front view thereof, and FIG. 4 is a cylinder to which the above-mentioned water pump is applied. FIG. 5 is a right side view showing a cylinder block to which the water pump is applied. The right side indicates the right side as viewed from the front of the engine.

This embodiment relates to a water pump 1 applied to a V-type diesel engine.

As shown in FIG. 2, the water pump 1 shares a dead space 4 caused by a bank offset of a cylinder block 3 of a V-type engine having left and right banks 10a and 10b as a part of the water pump 1. Is what you do.

The dead space 4 is located at the front end of the left (right side in the figure) bank 10b formed offset to the rear.

As shown in FIG. 1, FIG. 3 and FIG. 4, a recess 33 for accommodating and incorporating the impeller 5 of the water pump 1 is formed in the front end face 2 of the cylinder block 3.
A portion of the recess 33 located behind the vane 23 of the impeller 5 forms a predetermined clearance along the shape of the impeller 5. Thus, dead space 4
It functions as a casing 9 in which the impeller 5 protrudes from the front thereof and is built therein. On the other hand, a portion of the recess 33 located behind the center of the impeller 5 forms a vortex chamber 34. The vortex chamber 34 communicates with the cooling water introduction port 7 (see FIG. 5) opened on the side surface of the cylinder block 3 through a passage hole, and functions as a cooling water introduction path. Further, the left and right ends of the concave portion 33 are respectively connected to the left and right banks 10a, 1a.
0b are respectively connected to the cooling water outlets 12a and 12b. The water pump housing 16 is hermetically mounted from the front so as to cover the concave portion 33, whereby the cooling water outflow passages 14 are formed on both the left and right sides.

At the front end of the dead space 4, the shaft extends from the front end face 2 to the axis of the impeller 5 and above the concave portion 33, and is bent toward the upper surface of the cylinder block 3. A through hole 35 is formed. Further, a similar through hole 36 is formed below the concave portion 33,
The through hole 36 extends from the axis of the impeller 5 to the rear from a position offset rightward when viewed from the front, and is bent obliquely downward toward the side surface of the cylinder block 3 (hereinafter, left and right). The direction indicates the direction viewed from the front).

In the drawing, reference numeral 37 denotes a water jacket,
Reference numeral 38 denotes a cylinder bore.

The water pump housing 16 has a cylindrical bearing boss 19 extending forward with the impeller 5 as an axis.
Is formed, and a rotary shaft 18 connected to the impeller 5 is rotatably supported therein.

A plurality of bolt holes 17 for fixing to the cylinder block 3 are formed around the water pump housing 16.

The rotating shaft 18 projects forward and backward from the bearing boss 19, and a rotating body 32 having a sprocket 31 on its outer periphery is provided at the front end of the rotating shaft 18 so as to cover the bearing boss 19 from the front. It is fixed and provided. The rotating body 32 rotates by a chain (not shown) driven by a crankshaft (not shown) wound around a sprocket 31 and drives the rotating shaft 18. Although not shown, a chain cover that covers the water pump 1 and the chain and the like is attached in front of the cylinder block 3 to partition an oil atmosphere.

The rear end of the rotary shaft 18 is inserted into a concave portion 33, in which an impeller 5 having a plurality of vanes 23 is connected and fixed. This impeller 5
Is press-formed integrally with the vane 23, pressurizes cooling water sucked from a radiator (not shown), flows the same from the cylinder block 3 to a cylinder head (not shown), and circulates the radiator. It has a function.

On the rotating shaft 18, between the mounting portion of the impeller 5 and the bearing portion of the bearing boss 19, the rotating shaft 1 is provided.
8, a mechanical seal 24 is provided.
The impeller 5 side for cooling water and the bearing boss 19 side are partitioned. This mechanical seal 24
Is configured to press and seal the carbon seal ring against the ring-shaped floating seat with a spring, and to prevent the generation of abnormal noise due to the stick-slip phenomenon that occurs when the engine rotates at low speed
It is formed so that a slight steam leak occurs from the sliding surface even during normal operation. Therefore, a small amount of cooling water and steam leak from the mechanical seal 24 to the gap 39 around the rotating shaft 18 on the bearing boss 19 side.

In the water pump housing 16,
A hole 43 is formed which extends upward from the upper end of the gap 39 and is bent rearward toward the through hole 35 of the cylinder block 3. By fixing the water pump housing 16 to the cylinder block 3, the hole 43 and the through hole 35 are integrally communicated.

By the way, the through hole 35 rises upward, and the outlet 26 opens on the upper surface of the dead space 4. As a result, a water vapor leak discharge passage 25 for discharging the water vapor leaked from the mechanical seal 24 from the outlet 26 on the upper surface of the cylinder block 3 is formed.

A hole 44 is formed in the water pump housing 16 so as to extend obliquely downward and to the right from the gap 39 and bend rearward toward the through hole 36 of the cylinder block 3. By fixing the water pump housing 16 to the cylinder block 3, the hole 44 and the through hole 36 are integrally communicated.

The outlet 28 (see FIG. 5) of the through hole 36 is opened on the right side surface of the dead space 4, whereby the cooling water leaked from the mechanical seal 24 is discharged from the outlet 28 on the side surface of the cylinder block 3. The water leak discharge path 27 is formed.

In particular, the steam leak discharge passage 25 is formed above the gap 39, and the cooling water leak discharge passage 27 is formed below the gap 39.

Next, the operation of the engine water pump according to the above configuration will be described.

The water pump 1 has a dead space 4 caused by a bank offset of a V-type engine.
In addition, since the impeller 5 is built in and the cooling water introduction passage is formed, the space can be effectively used, and the total length of the engine can be shortened by the length of the impeller 5. Further, since the water vapor leak discharge passage 25 and the cooling water leak discharge passage 27 are formed inside the cylinder block 3, the space can be effectively used, and it is not necessary to newly provide facilities such as piping, thereby reducing the number of manufacturing steps. Can be achieved.

On the other hand, the cooling water sucked into the impeller 5 and pressurized is sent into the cylinder block 3 through the cooling water outflow passage 14. At this time, the mechanical seal 2
4, a small amount of steam and cooling water leak into the gap 39 on the bearing boss 19 side.

However, since the steam leak discharge passage 25 is formed above the gap 39, the leaked steam is
The water passes through the steam leak discharge passage 25 and is discharged from the outlet 26.

On the other hand, since the cooling water leak discharge passage 27 is formed obliquely below the gap 39, the leaked cooling water flows down to the cooling water leak discharge passage 27, passes through the through hole 36, and exits therefrom. It is discharged from 28.

Therefore, the leaked water vapor and cooling water are discharged to the outside separated from the oil atmosphere, so that the entry of water into the oil atmosphere can be prevented.

In the above embodiment, the dead space 4 caused by the bank offset of the V-type engine is used. However, for example, the dead space caused by the bank offset of the horizontally opposed engine, the dead space caused by the serial engine, and the like. May be used. Also,
Needless to say, it can be applied to a gasoline engine.

[0039]

As described above, according to the present invention, an excellent effect of preventing the entry of water into the oil atmosphere while achieving a compact engine can be obtained.

[Brief description of the drawings]

FIG. 1 is a right vertical sectional view showing an embodiment of an engine water pump according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a front view showing a cylinder block to which the water pump according to the present invention is applied.

FIG. 5 is a right side view showing a cylinder block to which the water pump according to the present invention is applied.

FIG. 6 is a right vertical sectional view showing a conventional water pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water pump 3 Cylinder block 4 Dead space 5 Impeller 25 Steam leak discharge channel 26, 28 Exit 27 Cooling water leak discharge channel

Claims (3)

[Claims] 1. A water pump for an engine in which an impeller is built in a dead space at a front end of a cylinder block, wherein a cooling water leak discharge path is formed in the dead space, and an outlet of the leak discharge path is connected to the dead water. An engine water pump characterized by opening to the side of the space. 2. A water pump for an engine having a built-in impeller in a dead space at a front end of a cylinder block, wherein a water vapor leak discharge path is formed in the dead space, and an outlet of the leak discharge path is connected to the dead space. An engine water pump characterized by having an opening on the upper surface of the engine. 3. The engine water pump according to claim 1, wherein the dead space is caused by a bank offset of the V-type engine.