JP6378641B2 - Engine water cooling system - Google Patents

Description

  The present invention relates to an engine water cooling device, and more particularly to an engine water cooling device capable of reducing the outer diameter of a connection portion between a pump inlet pipe and a cooling water introduction pipe.

Conventionally, there are the following water cooling devices for engines (see, for example, Patent Document 1).
A water pump and a cooling water introduction pipe are provided. The water pump has a pump main body and a pump inlet pipe, the pump inlet pipe is led out from the pump main body, and a pipe outlet of the cooling water introduction pipe is fitted to the outer periphery of the pump inlet pipe. Engine water cooling device

  According to this type of water cooling device, there is an advantage that the water pump and the cooling water introduction pipe can be easily connected.

  However, in the thing of patent document 1, a cooling water introduction pipe is a flexible pipe, the pipe outlet of a cooling water introduction pipe is fitted by the outer periphery of a pump inlet pipe, and it is cyclic | annular in the outer periphery of the pipe outlet of a cooling water introduction pipe. There is a problem because the clamp is fitted.

JP 2003-56347 A (see FIG. 1)

<Problem> The annular clamp easily interferes with surrounding parts.
In Patent Document 1, the cooling water introduction pipe is a flexible pipe, the pipe outlet of the cooling water introduction pipe is fitted to the outer periphery of the pump inlet pipe, and an annular clamp is provided on the outer periphery of the pipe outlet of the cooling water introduction pipe. Since they are fitted, the outer diameter of the connection portion between the pump inlet pipe and the cooling water introduction pipe is increased by the overlap of the flexible pipe and the annular clamp. For this reason, the said connection location tends to interfere with peripheral components.

  The subject of this invention is providing the water cooling apparatus of the engine which can make the outer diameter size of the connection location of a pump inlet pipe and a cooling water introduction pipe small.

  As a result of research, the inventors of the present invention fixed an inflexible cooling water introduction pipe to an engine, and the pipe outlet of the cooling water introduction pipe sandwiched a cylindrical elastic seal between the pump inlet pipe and the pipe outlet pipe. It was discovered that when fitted to the outer periphery, the outer diameter of the connecting portion between the pump inlet pipe and the cooling water introduction pipe can be reduced, leading to the present invention.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1A, a water pump (1) and a cooling water introduction pipe (2) are provided, and the water pump (1) is provided with a pump body (1a) and a pump inlet pipe (1b). The inlet pipe (1b) is led out from the pump body (1a), and, as illustrated in FIGS. 1 (B), 3 (A) and (C), a cooling water introduction pipe (2 In the water cooling device of the engine, in which the pipe outlet (2a) is fitted,
As illustrated in FIG. 1 (A), a cylindrical elastic seal (3) is provided, and the cylindrical elastic seal (3) is fitted to the outer periphery of the pump inlet pipe (1b), and the cooling water introduction pipe (2). Is non-flexible and fixed to the engine. As illustrated in FIGS. 1B and 3A , the pipe outlet (2a) of the cooling water introduction pipe (2) has a cylindrical elastic seal ( 3) is sandwiched between the outer periphery of the pump inlet pipe (1b) ,
As illustrated in FIGS. 1B and 3A, the cylindrical elastic seal 3 is fitted from the outlet end 1c side of the pump inlet pipe 1b to the pump body 1a. It is configured to be fitted to the outer periphery of the pump inlet pipe (1b), and the finger hook portion (3b) is provided at the end of the cylindrical elastic seal (3) on the pump body (1a) side. The engine water cooling device.

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> It is possible to reduce the outer diameter of the connection portion between the pump inlet pipe and the cooling water introduction pipe.
As illustrated in FIG. 1 (A), a cylindrical elastic seal (3) is provided, and the cylindrical elastic seal (3) is fitted to the outer periphery of the pump inlet pipe (1b), and the cooling water introduction pipe (2). Is non-flexible and fixed to the engine. As illustrated in FIGS. 1B and 3A , the pipe outlet (2a) of the cooling water introduction pipe (2) has a cylindrical elastic seal ( 3) is interposed between the pump inlet pipe (1b) and the pump outlet pipe (1b) so that there is no need to provide an annular clamp on the outer periphery of the pipe outlet (2a) of the cooling water introduction pipe (2). It is possible to reduce the outer diameter of the connecting portion between the pipe (1b) and the cooling water introduction pipe (2). For this reason, the said connection location does not interfere with peripheral components easily.

<Effect> The sealing property between the pump inlet pipe and the pipe outlet of the cooling water introduction pipe is high.
As illustrated in FIGS. 1B and 3A, the pipe outlet (2a) of the cooling water introduction pipe (2) has a cylindrical elastic seal (3) sandwiched therebetween and a pump inlet pipe (1b). ), The sealing property between the pump inlet pipe (1b) and the pipe outlet (2a) of the cooling water introduction pipe (2) is high.

<Effect> Installation of the cylindrical elastic seal is facilitated.
As illustrated in FIGS. 1 (A), (B), and FIG. 3 (A), the cylindrical elastic seal (3) is provided from the outlet end (1c) side of the pump inlet pipe (1b) to the pump body (1a) side. It is configured to be fitted to the outer periphery of the pump inlet pipe (1b), and a finger hook portion (3b) is provided at the end of the cylindrical elastic seal (3) on the pump body (1a) side. Therefore, the tubular elastic seal (3) can be pulled from the lead-out end (1c) side of the pump inlet pipe (1b) to the pump body (1a) side by putting a finger on the finger hook (3b) The mounting operation of the cylindrical elastic seal (3) on the outer periphery of the inlet pipe (1b) is facilitated.

(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> The sealing performance between the cylindrical elastic seal and the pipe outlet of the cooling water introduction pipe is enhanced.
As illustrated in FIGS. 1B and 3A, an annular groove (3a) and an annular ridge (2b) that are fitted to each other are provided, and the outer periphery of the cylindrical elastic seal (3) and the introduction of cooling water are provided. An annular groove (3a) is formed along the circumferential direction on one of the inner circumferences of the pipe outlet (2a) of the pipe (2), and an annular ridge (2b) is formed along the circumferential direction on the other. Therefore, the sealing performance between the cylindrical elastic seal (3) and the pipe outlet (2a) of the cooling water introduction pipe (2) is enhanced by the fitting of the annular groove (3a) and the annular protrusion (2b).

(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 1 or claim 2 .
<Effect> The sealing performance between the pump inlet pipe and the cylindrical elastic seal is enhanced.
As illustrated in FIGS. 1A, 1B, and 3A, an annular clamp (4) is provided, and the annular clamp (4) includes a pump inlet pipe (1b) and a cooling water introduction pipe (2). Since it is fitted to the outer periphery of the cylindrical elastic seal (3) on the pump body (1a) side than the fitting location (5) of the pipe outlet (2a), the pump inlet pipe (1b) and the cylindrical elastic seal The sealing property between (3) increases.

<Effect> The outer diameter of the annular clamp can be reduced.
As illustrated in FIGS. 1 (A), 1 (B), and 3 (A), the annular clamp (4) is fitted to the outer periphery of the cylindrical elastic seal (3). The outer diameter can be reduced. For this reason, the annular clamp (4) is unlikely to interfere with peripheral components.

(Invention of Claim 4 )
The invention according to claim 4 has the following effects in addition to the effects of the invention according to any one of claims 1 to 3 .
<Effect> No surface processing of the pump inlet pipe is required.
Since the outer peripheral surface of the pump inlet pipe (1b) is left with the casting surface formed at the time of casting, surface processing of the pump inlet pipe (1b) becomes unnecessary.

<Effect> There is no problem in the sealing performance between the pump inlet pipe and the cylindrical elastic seal.
Since the cylindrical elastic seal (3) is in close contact with the surface of the casting surface of the pump inlet pipe (1b), there is no problem in the sealing performance between the pump inlet pipe (1b) and the cylindrical elastic seal (3).

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the water-cooling apparatus of the engine which concerns on embodiment of this invention, FIG. 1 (A) is a front view of a water pump and a cooling water introduction pipe, FIG. It is. FIGS. 2A and 2B are views illustrating a cylindrical elastic seal and a pipe outlet of a cooling water introduction pipe used in the embodiment of the present invention, FIG. 2A is a longitudinal front view of the cylindrical elastic seal, and FIG. ) Is a cross-sectional view taken along the line BB in FIG. 2, FIG. 2C is a front view of the cylindrical elastic seal, and FIG. 2D is a longitudinal front view of the pipe outlet. FIG. 3A is a view for explaining a modification of the annular ridge and the cylindrical elastic seal used in the embodiment and the reference form of the present invention, and FIG. 3A is a view of the embodiment using the modification of the annular ridge. FIG. 3 (B) is a view corresponding to FIG. 2 (D) of a pipe outlet using an annular projection-like modification, and FIG. 3 (C) is a reference form of FIG. 1 using a modification of a cylindrical elastic seal. (B) It is an equivalent figure. 1 is a front view of an engine according to an embodiment of the present invention. FIG. 5 is a partially longitudinal side view of the engine of FIG. 4.

1 to 5 are views for explaining a water cooling device for an engine according to an embodiment of the present invention. In this embodiment, a water-cooled vertical in-line two-cylinder diesel engine will be described. FIG. 3C shows a reference form using a modification of the cylindrical elastic seal.

Embodiments will be described.
The outline of this engine is as follows.
As shown in FIG. 4, the installation direction of the crankshaft (8) is the front-rear direction, and of the front-rear direction, the side with the engine cooling fan (9) is the front, the side with the flywheel (10) is the rear, As shown, the horizontal direction of the engine is defined as the horizontal direction when viewed in a direction parallel to the direction in which the crankshaft (8) is installed.
4 and 5, the cylinder head (12) is assembled to the upper part of the cylinder block (11), the cylinder head cover (13) is assembled to the upper part of the cylinder head (12), and the cylinder block (11) is assembled. A water pump (1) and a timing transmission case (14) are assembled to the front, an engine cooling fan (9) is attached to the front of the water pump (1), and a radiator ( 15) is arranged.
The water pump (1) and the engine cooling fan (9) are driven by the crankshaft (8) via the fan drive belt (16). The engine cooling fan (9) is attached to the pump input pulley (1d).
An oil pan (17) is assembled to the lower part of the cylinder block (11).
4 and 5, an intake manifold (20) is assembled on one side of the cylinder head (12), and an exhaust manifold (7) is assembled on the other side of the cylinder head (12). Yes.

This engine includes a water cooling device.
As shown in FIG. 4, a thermostat case (21) is assembled to the front of the cylinder head (12), the thermostat (22) is accommodated in the thermostat case (21), and the thermostat cover (23) ) Is assembled. The thermostat (22) is of the wax pellet type.
A water jacket (not shown) is provided in each of the cylinder block (11) and the cylinder head (12), and these water jackets communicate with each other in the vertical direction.

As shown in FIG. 4, the thermostat cover (3) communicates with the upper tank (15a) of the radiator (15) via the radiator inlet hose (18). The lower tank (15b) of the radiator (15) communicates with the water pump (1) via the radiator outlet hose (19).
For this reason, when the thermostat (22) is opened after the warm-up operation, the engine cooling water (6) is fed from the water pump (1) to the water jacket of the cylinder block (11) by the pumping force of the water pump (1). Water pump (1) through the water jacket of cylinder head (12), thermostat case (21), thermostat cover (23) , radiator inlet hose (18), radiator (15), radiator outlet hose (19) in this order Return to.
The cylinder block (11), the cylinder head (12), the thermostat case (21), and the casing of the water pump (1) are all made of aluminum die casting.

  As shown in FIG. 1 (A), the water cooling device includes a water pump (1) and a cooling water introduction pipe (2), and the water pump (1) includes a pump body (1a) and a pump inlet pipe (1b). The pump inlet pipe (1b) is led out from the pump body (1a), and as shown in FIGS. 1 (B), 3 (A) and 3 (C), a cooling water introduction pipe is provided on the outer periphery of the pump inlet pipe (1b). The pipe outlet (2a) of (2) is fitted.

As shown in FIG. 1A, a cylindrical elastic seal (3) is provided, the cylindrical elastic seal (3) is fitted to the outer periphery of the pump inlet pipe (1b), and the cooling water introduction pipe (2) is , Non-flexible and fixed to the engine, as shown in FIG. 1 (B), the pipe outlet (2a) of the cooling water introduction pipe (2) sandwiches the cylindrical elastic seal (3), It is fitted on the outer periphery of the pump inlet pipe (1b).
For this reason, it is not necessary to provide an annular clamp on the outer periphery of the pipe outlet (2a) of the cooling water introduction pipe (2), and the outer diameter dimension of the connecting portion between the pump inlet pipe (1b) and the cooling water introduction pipe (2) is reduced. can do. For this reason, a connection location does not interfere easily with peripheral components, such as a pump input pulley (1d) and a fan drive belt (16).
Further, the cylindrical elastic seal (3) provides high sealing performance between the pump inlet pipe (1b) and the pipe outlet (2a) of the cooling water introduction pipe (2).

A cylindrical rubber seal is used for the cylindrical elastic seal (3), and the cylindrical elastic seal (3) is frictionally fixed to the outer periphery of the pump inlet pipe (1b) with an elastic restoring force.
An inflexible metal pipe is used for the cooling water introduction pipe (2). The cooling water introduction pipe (2) is fixed to the timing transmission case (14) with bolts (not shown). An inflexible hard resin pipe may be used as the cooling water introduction pipe (2).

As shown in FIG. 1 (B), the water cooling device includes an annular groove (3a) and an annular protrusion (2b) that are fitted to each other, and the annular groove (3a) is formed on the outer periphery of the cylindrical elastic seal (3). An annular protrusion (2b) is formed along the circumferential direction on the inner periphery of the pipe outlet (2a) of the cooling water introduction pipe (2).
An annular ridge (2b) is formed on the outer periphery of the cylindrical elastic seal (3) along the circumferential direction, and an annular groove (3a) is formed on the inner periphery of the pipe outlet (2a) of the cooling water introduction pipe (2). You may form along.
That is, an annular groove (3a) is formed along the circumferential direction in one of the outer periphery of the cylindrical elastic seal (3) and the inner periphery of the pipe outlet (2a) of the cooling water introduction pipe (2). The annular protrusion (2b) should just be formed along the circumferential direction.
For this reason, the sealing performance between the cylindrical elastic seal (3) and the pipe outlet (2a) of the cooling water introduction pipe (2) is enhanced by the fitting of the annular groove (3a) and the annular protrusion (2b).
As shown in FIGS. 2A to 2C, a plurality of annular grooves (3a) are arranged in the axial direction of the cylindrical elastic seal (3), and any one of the annular grooves (3a) and the annular protrusions are arranged. The strip (2b) is fitted.

As shown in FIGS. 1 (A) and 1 (B), the cylindrical elastic seal (3) is fitted from the lead-out end side of the pump inlet pipe (1b) to the pump body (1a) side, and the pump inlet pipe (1b) The finger hook portion (3b) is provided at the end of the cylindrical elastic seal (3) on the pump body (1a) side.
For this reason, the tubular elastic seal (3) can be pulled from the lead-out end side of the pump inlet pipe (1b) to the pump body (1a) side by putting a finger on the finger hook (3b), and the pump inlet pipe ( The mounting operation of the cylindrical elastic seal (3) on the outer periphery of 1b) is facilitated.
As shown in FIGS. 2 (A) to 2 (C), the finger hook portion (3b) has an annular shape and is provided in a pair at mutually opposed positions.

As shown in FIGS. 1 (A) and 1 (B), the water cooling device includes an annular clamp (4), and the annular clamp (4) is connected to the pump inlet pipe (1b) and the pipe outlet of the cooling water introduction pipe (2) ( It is fitted to the outer periphery of the cylindrical elastic seal (3) on the pump body (1a) side from the fitting part (5) of 2a).
For this reason, the sealing performance between the pump inlet pipe (1b) and the cylindrical elastic seal (3) is enhanced.
In addition, the outer diameter of the annular clamp (4) can be reduced. For this reason, the annular clamp (4) is unlikely to interfere with peripheral components.
A belt clamp that tightens the cylindrical elastic seal (3) from the outer periphery is used for the annular clamp (4).

The modified example of the annular ridge (2b) shown in FIGS. 3 (A) and 3 (B) is different from the basic example of the annular ridge (2b) shown in FIG. 1 (B) in the following points.
The basic example of the annular ridge (2b) shown in FIG. 1 (B) is formed by curving the peripheral wall of the pipe outlet (2a) of the cooling water introduction pipe (2) in an arc shape inward, 3 (A) and 3 (B) is a modification of the annular ridge (2b) in which only the inner periphery of the peripheral wall of the pipe outlet (2a) of the cooling water introduction pipe (2) is raised inward in an arc shape. Is formed.
As shown in FIG. 3 (A), the modified example of the annular ridge (2b) is used in the same manner as the basic example of the annular ridge (2b) as shown in FIG. 1 (B). 3A and 3B, the same elements as those in FIG. 1B are denoted by the same reference numerals.

The modified example of the cylindrical elastic seal (3) shown in FIG. 3 (C) is different from the basic example of the cylindrical elastic seal (3) shown in FIG. 1 (B) in the following points. A configuration using a cylindrical elastic seal (3) shown in FIG.
The basic example of the cylindrical elastic seal (3) shown in FIG. 1B is frictionally fixed to the outer periphery of the pump inlet pipe (1b) by the elastic restoring force of the cylindrical elastic seal (3). A modification of the cylindrical elastic seal (3) shown in FIG. 3 (C) is fixed to the outer periphery of the pump inlet pipe (1b) by baking.
As a modification of the cylindrical elastic seal (3), it may be fixed to the outer periphery of the pump inlet pipe (1b) with an adhesive.
In these cases, it is not necessary to provide an annular clamp on the outer periphery of the cylindrical elastic seal (3).

On the outer peripheral surface of the pump inlet pipe (1b), the casting surface formed at the time of casting is left.
This eliminates the need for surface processing of the pump inlet pipe (1b).
In addition, since the cylindrical elastic seal (3) is in close contact with the surface of the casting surface of the pump inlet pipe (1b), there is no problem in the sealing performance between the pump inlet pipe (1b) and the cylindrical elastic seal (3). .
The casing of the water pump (1) and the pump inlet pipe (1b) are an integrally cast product of aluminum die casting.

(1) Water pump
(1a) Pump body
(1b) Pump inlet pipe
(1c) Lead-out end
(2) Cooling water introduction pipe
(2a) Pipe outlet
(2b) Annular ridge
(3) Cylindrical elastic seal
(3a) Annular groove
(3b) Finger hook
(4) Annular clamp
(5) Mating location

Claims (4)

A water pump (1) and a cooling water introduction pipe (2) are provided, the water pump (1) is provided with a pump body (1a) and a pump inlet pipe (1b), and the pump inlet pipe (1b) is a pump body (1a). In the engine water cooling system, the pipe outlet (2a) of the cooling water introduction pipe (2) is fitted to the outer periphery of the pump inlet pipe (1b).
A cylindrical elastic seal (3) is provided. The cylindrical elastic seal (3) is fitted to the outer periphery of the pump inlet pipe (1b), and the cooling water introduction pipe (2) is inflexible and fixed to the engine. The pipe outlet (2a) of the cooling water introduction pipe (2) is fitted to the outer periphery of the pump inlet pipe (1b) with the cylindrical elastic seal (3) interposed therebetween ,
The cylindrical elastic seal (3) is configured to be fitted from the lead-out end (1c) side of the pump inlet pipe (1b) to the pump main body (1a) side and fitted to the outer periphery of the pump inlet pipe (1b). A water cooling device for an engine, wherein a finger hook portion (3b) is provided at an end of the cylindrical elastic seal (3) on the pump body (1a) side. The engine water cooling device according to claim 1,
An annular groove (3a) and an annular ridge (2b) that are fitted to each other are provided, and one of the outer periphery of the cylindrical elastic seal (3) and the inner periphery of the pipe outlet (2a) of the cooling water introduction pipe (2). An engine water cooling system characterized in that an annular groove (3a) is formed along the circumferential direction on one side and an annular ridge (2b) is formed along the circumferential direction on the other side. In the engine water cooling device according to claim 1 or 2 ,
An annular clamp (4) is provided, and the annular clamp (4) is closer to the pump body (1a) than the fitting portion (5) between the pump inlet pipe (1b) and the pipe outlet (2a) of the cooling water introduction pipe (2). And a water cooling device for an engine, which is fitted to the outer periphery of the cylindrical elastic seal (3). The engine water cooling device according to any one of claims 1 to 3 ,
A water cooling system for an engine, characterized in that the outer peripheral surface of the pump inlet pipe (1b) is left with a casting surface formed during casting.

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