JP2013060830A - Water-cooled engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-cooled engine that prevents an engine wall surrounding a water pump chamber wall from being contaminated due to adhesion of engine cooling water.SOLUTION: In the water-cooled engine, engine cooling water 12 leaked from a mechanical seal 7 is discharged into a water pump input pulley 4 through a leaked water inflow space 10 and a drain hole 11. An outlet 14 of the drain hole 11 is opened forward of a rear opening end part 6 in the water pump input pulley 4. A spiral groove 33 is formed along an inner peripheral face of a peripheral wall of the water pump input pulley 4. The engine cooling water 12 dropped from the outlet 14 of the drain hole 11 is supplied to a front side of the water pump input pulley 4 through the spiral groove 33 which rotates 34 together with the water pump input pulley 4.

Description

  The present invention relates to a water-cooled engine, and more particularly, to a water-cooled engine that can suppress a problem that an engine machine wall around a water pump chamber wall is contaminated by adhesion of engine cooling water.

Conventionally, as a water-cooled engine, a boss is projected forward from the wall of the water pump chamber, and the water pump input shaft is inserted through the boss, and the front end wall of the cup-type water pump input pulley is attached to the front end of the water pump input shaft. The boss is inserted into the water pump input pulley from the rear opening end of the water pump input pulley, the mechanical seal is arranged on the rear side in the boss, and the bearing of the water pump input shaft is arranged on the front side in the boss. A water leakage inflow space is provided between the mechanical seal and the bearing in the boss, and the water leakage inflow space is communicated with the inside of the water pump input pulley through the drain hole, so that the engine coolant leaking from the mechanical seal is discharged from the water leakage inflow space and the drain. There is one that can be discharged into a water pump input pulley through a hole (see, for example, Patent Document 1).
According to this type of water-cooled engine, there is an advantage that the discharge processing of the engine coolant leaked from the mechanical seal can be easily performed.
However, this prior art has a problem because the outlet of the drain hole is located at the rear opening end of the input pulley.

JP 2003-155930 A (see FIG. 1)

<Problem> The engine machine wall around the water pump chamber wall is contaminated by the adhesion of engine cooling water.
Since the outlet of the drain hole is located at the rear opening end of the input pulley, even if the engine cooling water that has fallen from the outlet of the drain hole is received by the opening end of the input pulley, it is immediately centrifuged from the opening end. The engine wall around the wall of the water pump chamber is contaminated by the adhesion of engine cooling water. Contamination due to adhesion of engine cooling water occurs when dust adheres to engine cooling water before it evaporates, or when engine cooling water evaporates and non-freezing liquid or rust preventive non-volatile components remain Etc.

  The subject of this invention is providing the water cooling engine which can suppress the malfunction which the engine machine wall around a water pump chamber wall is contaminated by adhesion of engine cooling water.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1, a boss (2) is projected forward from the water pump chamber wall (1), and a water pump input shaft (3) is inserted through the boss (2). The front end wall (5) of the cup-type water pump input pulley (4) is attached to the front end portion of the water pump input pulley (4), and the boss (2) is connected to the water pump input pulley from the rear opening end portion (6) of the water pump input pulley (4). (4) Enter the inside, place the mechanical seal (7) on the rear side of the boss (2), and place the bearings (8) and (9) of the water pump input shaft (3) on the front side of the boss (2). In the boss (2), a water leakage inflow space (10) is provided between the mechanical seal (7) and the bearings (8) (9), and the water leakage inflow space (10) is provided via the drain hole (11). The engine cooling water (12) leaked from the mechanical seal (7) is communicated with the inside of the water pump input pulley (4), and the water pump input pulley (4) is passed through the leakage water inflow space (10) and the drain hole (11). ) Was possible manner, in a water-cooled engine,
As illustrated in FIG. 1, the outlet (14) of the drain hole (11) is opened in front of the rear opening end (6) in the water pump input pulley (4), and the water pump input pulley (4) A spiral groove (33) is formed along the inner peripheral surface of the peripheral wall, and the engine coolant (12) dropped from the outlet (14) of the drain hole (11) rotates (34) together with the water pump input pulley (4). A water-cooled engine characterized by being sent to the front side of the water pump input pulley (4) by a spiral groove (33).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> It is possible to suppress a problem that the engine machine wall around the water pump chamber wall is contaminated by adhesion of engine cooling water.
As illustrated in FIG. 1, the outlet (14) of the drain hole (11) is opened in front of the rear opening end (6) in the water pump input pulley (4), and the water pump input pulley (4) A spiral groove (33) is formed along the inner peripheral surface of the peripheral wall, and the engine coolant (12) dropped from the outlet (14) of the drain hole (11) rotates (34) together with the water pump input pulley (4). Since the spiral groove (33) is sent to the front side of the water pump input pulley (4), the engine cooling water (12) is held in the water pump input pulley (4) for a long time, and the water pump input pulley (4 The amount of engine cooling water (12) that is vaporized by the heat inside the pump and splashed from the rear opening end (6) of the water pump input pulley (4) to the surrounding area is reduced, and the area around the pump chamber wall (1) The problem that the engine machine wall (21) is contaminated by the adhesion of the engine coolant (12) can be suppressed.

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> It is possible to suppress a problem that the engine machine wall around the water pump chamber wall is contaminated by adhesion of engine cooling water.
As illustrated in FIG. 1, FIG. 2 (A) and FIG. 2 (B), the lower ridge (13) along the front-rear direction is raised downward from the lower peripheral surface portion of the boss (2), and the lower ridge (13) Since the drain hole (11) along the bearings (8) and (9) is opened in the wall, a part of the engine coolant (12) passing through the drain hole (11) by the heat of the bearings (8) and (9). The amount of engine cooling water (12) splashed around the rear opening end (6) of the water pump input pulley (4) is reduced and the engine machine around the water pump chamber wall (1) is reduced. The problem that the wall (21) is contaminated by the adhesion of the engine cooling water (12) can be suppressed.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 2.
<Effect> It is difficult for engine cooling water to adhere to the water pump chamber wall and the engine machine wall below the water pump chamber wall.
As illustrated in FIGS. 1, 2A and 2B, the water drop receiving surface (19) directed forward is led downward in the middle of the lower protrusion (13), so the outlet of the drain hole (11) The water droplets flowing out from (14) and trying to move rearward along the lower ridge (13) are received by the water droplet receiving surface (19) and do not easily reach the water pump chamber wall (1). Engine cooling water (12) hardly adheres to the chamber wall (1) and the engine machine wall (21) below the chamber wall (1).

(Invention of Claim 4)
The invention according to claim 4 has the following effect in addition to the effect of the invention according to claim 3.
<Effect> The vaporization of water droplets received on the water droplet receiving surface is promoted by the heat of the bearing.
As illustrated in FIG. 1, since the water droplet receiving surface (19) is disposed directly below the bearing (9), vaporization of the water droplets received by the water droplet receiving surface (19) is promoted by the heat of the bearing (9). .

(Invention according to claim 5)
The invention according to claim 5 has the following effect in addition to the effect of the invention according to claim 3 or claim 4.
<Effect> The vaporization of water droplets received on the water droplet receiving surface is promoted by heat accumulated in the water pump input pulley.
As illustrated in FIG. 1, since the water drop receiving surface (19) is disposed in the water pump input pulley (4), vaporization of water drops received by the water drop receiving surface (19) is caused in the water pump input pulley (4). It is promoted by the heat that is covered.

(Invention of Claim 6)
The invention according to claim 6 has the following effects in addition to the effects of the invention according to any one of claims 1 to 5.
<Effect> The amount of engine cooling water in the leakage inflow space is reduced.
As illustrated in FIG. 1 and FIG. 2 (A), the upper ridge (15) along the front-rear direction is raised upward from the upper peripheral surface portion of the boss (2), and the inside of the wall of the upper ridge (15) Since a vapor discharge hole (16) is formed along the bearings (8) and (9), and the inlet (17) of the vapor discharge hole (16) is communicated with the leakage water inflow space (10), the mechanical seal (7) The engine cooling water (12) that has flowed into the leaked water inflow space (10) as steam and the engine cooling water (12) that has become steam in the leaked water inflow space (10) are stored in the bearings (8) and (9). It receives heat, passes through the vapor discharge hole (16) without condensing, flows out into the water pump input pulley (4), and reduces the amount of engine cooling water in the water leakage inflow space (10).

It is a vertical side view of the water pump input pulley of the water-cooled engine which concerns on 1st Embodiment of this invention, and its peripheral part. 2A is a front view of the water pump chamber wall of the engine of FIG. 1 and its surrounding portion, and FIG. 2B is an enlarged view of the portion indicated by the arrow B in FIG. 1A. It is a vertical side view of the water pump and its peripheral part of the water-cooled engine of FIG. It is a front view of the engine of FIG. The water pump chamber wall of the water-cooled engine which concerns on 2nd Embodiment of this invention, and the front view of the surrounding part, FIG.5 (B) is an enlarged view of the B direction arrow part of FIG. 5 (A).

  1 to 4 are views for explaining a water-cooled engine according to the first embodiment of the present invention, and FIG. 5 is a view for explaining a water-cooled engine according to the second embodiment. A cylinder diesel engine will be described.

A first embodiment will be described.
The outline of this engine is as follows.
As shown in FIG. 4, the cylinder head (23) is assembled to the upper part of the cylinder block (22), the gear case (24) is assembled to the front part of the cylinder block (22), and the water pump case is installed to the front part of the gear case (24). (25) is assembled, and an oil pan (26) is assembled to the lower part of the cylinder head (23).

  As shown in FIG. 1, a boss (2) is projected forward from the water pump chamber wall (1), and a water pump input shaft (3) is inserted into the boss (2). The front end wall (5) of the cup-type water pump input pulley (4) is attached to the front end of the water pump, and the boss (2) is connected from the rear opening end (6) of the water pump input pulley (4) to the water pump input pulley ( 4) Enter the inside, place the mechanical seal (7) on the rear side of the boss (2), and place the bearings (8) and (9) of the water pump input shaft (3) on the front side of the boss (2). In the boss (2), a water leakage inflow space (10) is provided between the mechanical seal (7) and the bearings (8) (9), and the water leakage inflow space (10) is watered through the drain hole (11). The engine cooling water (12) leaking from the mechanical seal (7) is communicated with the inside of the pump input pulley (4), and the water pump input pulley (4) is passed through the water leakage inflow space (10) and the drain hole (11). Within the discharge I have to so that.

As shown in FIG. 4, the water pump chamber wall (1) is provided in the upper front part of the oil pump case (25). As shown in FIG. 3, an engine cooling fan (27) is attached to the water pump input pulley (4). The water pump input pulley (4) is driven from the crank pulley (28) via the fan belt (29).
An impeller (30) is attached to the rear end of the water pump input shaft (3), and this is accommodated in the water pump chamber (31).
As shown in FIG. 1, a pair of bearings (8) and (9) of the water pump input shaft (3) are arranged at the front and rear, both are rolling bearings, the front bearing (8) is a roller bearing, and the rear bearing. (9) is a ball bearing. The water leakage inflow space (10) has an annular shape.

As shown in FIG. 1, the outlet (14) of the drain hole (11) is opened in front of the rear opening end (6) in the water pump input pulley (4), and the peripheral wall of the water pump input pulley (4) A spiral groove (33) is formed along the inner peripheral surface of the engine, and the engine coolant (12) dropped from the outlet (14) of the drain hole (11) rotates (34) together with the water pump input pulley (4). The spiral groove (33) is fed to the front side of the water pump input pulley (4).
As shown in FIG. 1, in the water pump input pulley (4), the peripheral wall shape excluding the winding portion (18) is a cylindrical portion (35) having a constant inner diameter.

As shown in FIGS. 1, 2 (A) and 2 (B), the lower ridge (13) along the front-rear direction is raised downward from the lower peripheral surface portion of the boss (2), and the meat of the lower ridge (13) A drain hole (11) is formed in the wall along the bearings (8) and (9).
The outlet (14) of the drain hole (11) is opened at the center in the front-rear direction in the water pump input pulley (4).
The lower ridge (13) is a part of a water pump case (25) that is an integrally cast product of aluminum, and the wall of the lower ridge (13) is continuous with the wall of the boss (2).

As shown in FIGS. 1, 2 (A) and 2 (B), a water drop receiving surface (19) directed forward is led downward in the middle of the lower protrusion (13), and the water drop receiving surface (19) is It is located in the water pump input pulley (4) just below 9).
A step is formed on the lower protrusion (13) with the water drop receiving surface (19) as a boundary.

As shown in FIG. 1 and FIG. 2 (A), the upper ridge (15) along the front-rear direction is raised upward from the upper peripheral surface portion of the boss (2), and the upper ridge (15) is raised in the wall of the upper ridge (15). A vapor discharge hole (16) is formed along the bearings (8) and (9), and the inlet (17) of the vapor discharge hole (16) is communicated with the water leakage inflow space (10).
The upper ridge (15) is a part of a water pump case (25) that is an integrally cast product of aluminum, and the wall of the upper ridge (15) is continuous with the wall of the boss (2).

In this embodiment, the following may be used.
The drain hole (11) is filled with a water absorbing material such as sponge, and the engine cooling water (12) accumulated in the water leakage inflow space (10) is absorbed by the water absorbing material and gradually evaporated in the drain hole (11). Most of the cooling water (12) is discharged from the drain hole (11) in the form of paper.

A blade is provided in the water pump input pulley (4), and a wind is generated in the water pump input pulley (4) by the rotation of the water pump input pulley (4). Provide ventilation.
Water repellent coating (fluorine resin coating, etc.) is applied to the surface of the water pump wall (1), the engine machine wall (21) below and the like where the engine cooling water (12) is likely to adhere to the engine cooling water (12) Prevent contamination by.

LLC (Long Life Coolant) used for painting camouflage patterns on parts where the engine cooling water (12) is likely to adhere, such as the water pump wall (1) and the engine machine wall (21) below it, and engine cooling water (12) Applying a paint that mimics the color of when it dries, making it less conspicuous by engine cooling water (12).
The surface condition of the parts where the engine cooling water (12) is likely to adhere, such as the water pump wall (1) and the engine machine wall (21) below the water pump wall, is increased, and the residue is peeled off when the engine cooling water (12) is dried. Make it easier.

  Although it cannot be set as embodiment of this invention, the water leakage storage space provided in the predetermined location of the engine is connected via the pipe from the water leakage inflow space (10), and the engine cooling water (12) of the water leakage inflow space (10) Is discharged to the water leakage storage space through a pipe and stored in the water storage space, as in this embodiment, the water pump wall (1) and the engine machine wall (21) below the engine cooling water ( 12) can be prevented from being contaminated.

In the second embodiment shown in FIG. 5, a plurality of grooves (20) are formed in the lower ridge (13) just below the bearings (8) and (9) of the water pump input shaft (3). The groove (20) is formed on the front side and the rear side of the water drop receiving surface (19). The heat radiation of the bearings (8) and (9) from the surface of the groove (20) promotes the vaporization of water droplets traveling along the lower protrusion (13).
Other structures are the same as those of the first embodiment shown in FIG. 2 and the like, and in FIG. 5, the same elements as those of the first embodiment are denoted by the same reference numerals.

(1) Water pump room wall
(2) Boss
(3) Water pump input shaft
(4) Water pump input pulley
(5) Front end wall
(6) Rear opening end
(7) Mechanical seal
(8) Bearing
(9) Bearing
(10) Water leakage inflow space
(11) Drain hole
(12) Engine cooling water
(13) Lower ridge
(14) Exit
(15) Upper ridge
(16) Vapor discharge hole
(17) Entrance
(19) Water drop receiving surface
(33) Spiral groove
(34) Rotation

Claims (6)

The boss (2) is projected forward from the water pump chamber wall (1), the water pump input shaft (3) is inserted into the boss (2), and a cup-shaped cup is formed at the front end of the water pump input shaft (3). Attach the front end wall (5) of the water pump input pulley (4), and let the boss (2) enter the water pump input pulley (4) from the rear opening end (6) of the water pump input pulley (4). A mechanical seal (7) is arranged on the rear side of the boss (2), a bearing (8) (9) of the water pump input shaft (3) is arranged on the front side of the boss (2), and the boss (2) A water leakage inflow space (10) is provided between the mechanical seal (7) and the bearings (8), (9), and the water leakage inflow space (10) is placed in the water pump input pulley (4) through the drain hole (11). The engine cooling water (12) leaking from the mechanical seal (7) can be discharged into the water pump input pulley (4) through the water leakage inflow space (10) and the drain hole (11). ,water In the engine,
The outlet (14) of the drain hole (11) is opened in front of the rear opening end (6) in the water pump input pulley (4), and along the inner peripheral surface of the peripheral wall of the water pump input pulley (4). The engine cooling water (12) that forms a spiral groove (33) and that has fallen from the outlet (14) of the drain hole (11) rotates in the spiral groove (33) together with the water pump input pulley (4). A water-cooled engine characterized by being sent to the front side of (4). The water-cooled engine according to claim 1,
The lower ridge (13) along the front-rear direction is raised downward from the lower peripheral surface of the boss (2), and a drain hole (11 along the bearing (8) (9) is formed in the wall of the lower ridge (13). ) Is a water-cooled engine. The water-cooled engine according to claim 2,
A water-cooled engine, characterized in that a water drop receiving surface (19) directed forward is led downward in the middle of the lower protrusion (13). The water-cooled engine according to claim 3,
A water-cooled engine, characterized in that a water drop receiving surface (19) is arranged directly under a bearing (9). The water-cooled engine according to claim 3 or 4,
A water-cooled engine, characterized in that a water drop receiving surface (19) is arranged in a water pump input pulley (4). The water-cooled engine according to any one of claims 1 to 5,
The upper ridge (15) along the front-rear direction is raised upward from the upper peripheral surface of the boss (2), and a vapor discharge hole (9) along the bearing (8) (9) is formed in the wall of the upper ridge (15). 16) A water-cooled engine characterized in that an opening (17) of the vapor discharge hole (16) is communicated with a water leakage inflow space (10).

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