JPH08193677A - Water pipe of internal combustion engine - Google Patents

Abstract

PURPOSE: To secure the sufficient joining strength, and to prevent a wire harness from being damaged by providing a joining face of a bracket to which a part of the wire harness arranged in the engine room is fixed to a bent part of a water pipe and on its inner side. CONSTITUTION: In a water pipe 4 of an internal combustion engine where a radiator 2 is connected to the water pump, and the cooling water is fed from the radiator 2 to a water pump, a bracket 12 to which a part of a wire harness arranged in the engine room of the internal combustion engine is fixed is provided, and the joining face of the bracket 12 is provided on a bent part and on its inner side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pipe of an internal combustion engine, and more particularly, a joint surface of a bracket for fixing a part of a wire harness arranged in an engine room is provided at a bent portion and an inner side of the water pipe. The present invention relates to a water pipe for an internal combustion engine, which ensures a sufficient coupling strength and prevents damage to a wire harness.

[0002]

2. Description of the Related Art A radiator for cooling cooling water is arranged in front of a vehicle equipped with an internal combustion engine, and the cooling water from the radiator is supplied to a water pump by a water pipe.

The water pump circulates cooling water under pressure by a water pump in a cooling water passage formed in a cylinder head and a cylinder block of the internal combustion engine. The cooling water circulated under pressure by the water pump is circulated in the internal combustion engine. The engine heat generated in 1 is absorbed, the engine heat absorbed in the radiator is dissipated, and the internal combustion engine is cooled.

As a water pipe for the internal combustion engine,
Some are disclosed in Japanese Utility Model Publication No. 2-60787.
The wire harness fixing structure disclosed in this publication is
A bracket for fixing the wire harness is attached to the water pipe that guides the cooling water of the engine, and a part of the wire harness that forms the electric circuit in the engine room is fixed to the bracket.

[0005]

A conventional water pipe for an internal combustion engine is called a water inlet pipe. One end is connected to a radiator via a radiator outlet hose and the other end is connected to the water inlet pipe. Connected to pump.

The water pipe 104 is fixed to the cylinder block side (not shown), and as shown in FIG. 5, the first fixing bracket 112 for the thermostat cap and the second fixing bracket 1 for the cylinder block.
It is fixed by 16 and.

A portion of the wire harness 118 is arranged near the water pipe 104, and a portion of the wire harness 118 is attached to the bracket 120 for the wire harness 118 as shown in FIGS. 6 and 8. It is fixed to the water pipe 104 by.

At this time, the first and second fixing brackets 112 and 116 and the bracket 120 are attached to the water pipe 1.
No. 04 is joined by brazing, but in general, it is joined to a straight portion of the water pipe that avoids the bent portion.

However, when it becomes necessary to join the bracket 120 to the bent portion of the water pipe 104 due to a layout problem, as shown in FIG. 5, the bracket 120 is attached to the outer portion of the bent portion of the water pipe 104. And a joint surface 120f was provided.

As a result, the bent portion and the outer thickness of the water pipe are thinned by being formed by bending, and the joint surface of the bracket is provided in this thinned portion, so that the bonding strength is reduced and the practical There is an inconvenience of being disadvantageous.

As is clear from the portion A of FIG. 6, the wire harness 118 and the brazing portion of the joint surface 120f of the bracket 120 come into contact with each other, and the bracket 1
There is a risk that the wire harness 118 may be damaged by spatter (flying burns) such as temporary tack spot welding of 20, and the service life of the wire harness 118 is shortened, which is an economical disadvantage.

[0012]

In order to eliminate the above-mentioned inconvenience, the present invention relates to a water pipe of an internal combustion engine, which connects a radiator and a water pump and supplies cooling water from the radiator to the water pump. A bracket for fixing a part of a wire harness disposed in an engine room of the engine is provided, and a joint surface of the bracket is provided at a bent portion and an inner side of the water pipe.

[0013]

According to the invention as described above, when the bracket for fixing a part of the wire harness arranged in the engine room is joined to the bent portion of the water pipe,
The joint surface of the bracket is provided on the inner side of the bent portion of the water pipe to ensure sufficient coupling strength and prevent damage to the wire harness.

[0014]

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

1 to 4 show an embodiment of the present invention. In FIG. 1, 2 is a radiator arranged in the front part of the engine room of a vehicle (not shown) equipped with an internal combustion engine (not shown), and 4 is a water pipe which is a water inlet pipe.

The radiator 2 is connected to the thermostat cap 8 by a radiator inlet hose 6, and a radiator outlet pipe 10 is provided.
Is connected to the water pipe 4, and the water pipe 4 is connected to a water pump (not shown).

As shown in FIG. 1, the water pipe 4 includes a first fixing bracket 12 for the thermostat cap 8 and a second fixing bracket 1 for the cylinder block 14.
It is fixed by 6.

Then, the first and second fixing brackets 1
2 and 16 are joined to the linear portion of the water pipe 4 by brazing.

Further, a wire harness 18 is arranged in an engine room (not shown) of an internal combustion engine (not shown).
As shown in FIGS. 2A and 2B, a part of the wire harness 18 is fixed to the water pipe 4 by a bracket 20 for the wire harness 18.

At this time, the joint surface 20f of the bracket 20
Is provided on the inner side of the bent portion of the water pipe 4.

More specifically, when it is necessary to provide the joint surface 20f of the bracket 20 on the bent portion of the water pipe 4 due to a layout problem, it will be described with reference to FIGS.
As shown respectively in FIGS. 1 and 2, the joint surface 20f of the bracket 20 is provided in the inner portion of the bent portion of the water pipe 4 where the thickness hardly changes after bending, so that the joint strength is prevented from lowering and sufficient joint strength is secured. is there.

Reference numeral 22 is a clamp, 24 is an O-ring, and 26 is a fixing bolt.

Next, the operation will be described.

First, one end of the radiator inlet hose 6 is attached to the radiator 2 by the clamp 22, and the other end of the radiator inlet hose 6 is attached to the thermostat cap 8 by the clamp 22.

Also, one end of the radiator outlet pipe 10 is attached to the radiator 2 by a clamp 22, and the other end of the radiator outlet pipe 10 is connected to one end of the water pipe 4 by a clamp 22. Connect the end to a water pump (not shown).

The water pipe 4 is fixed to the thermostat cap 8 by the first fixing bracket 12 and is fixed to the cylinder block 14 by the second fixing bracket 16.

Further, a wire harness 18 disposed in an engine room (not shown) of an internal combustion engine (not shown) is attached to a bracket 20 provided at a bent portion of the water pipe 4.
Fix part of.

As a result, the bracket 20 can be joined to the inner portion of which the thickness hardly changes after bending, the decrease in bonding strength can be prevented, and sufficient bonding strength can be secured, which is practically advantageous. Is.

Further, since the wire harness 18 and the brazing portion of the joining surface 20f of the bracket 20 do not come into contact with each other, there is no fear that the wire harness will be damaged by spatter such as temporary spot welding of the bracket 20. It is possible to prolong the service life of the harness, which is economically advantageous.

Further, since it can be realized by a simple operation of changing the joining position of the bracket 20, there is no fear of complicating the structure, and the cost can be kept low.

[0031]

As described in detail above, according to the present invention, a water pipe of an internal combustion engine that connects a radiator and a water pump and supplies cooling water from the radiator to the water pump is installed in an engine room of the internal combustion engine. Since the bracket that fixes a part of the wire harness to be installed is provided and the joining surface of the bracket is provided inside and inside the bent portion of the water pipe, the bracket can be joined to the inside portion where the thickness hardly changes after bending. ,
It is possible to prevent a decrease in the bond strength and ensure a sufficient bond strength, which is practically advantageous. In addition, since the wire harness and the brazed portion of the joint surface of the bracket do not come into contact with each other, there is no possibility that the wire harness will be damaged by spatter such as temporary spot welding of the bracket, which prolongs the service life of the wire harness. Therefore, it is economically advantageous.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a water pipe of an internal combustion engine showing an embodiment of the present invention.

FIG. 2 is an enlarged plan view of an essential part of a bent portion of a water pipe.

3 is an enlarged plan view of an essential part of a bent portion of the water pipe taken along the arrow 〓 of FIG.

FIG. 4 is a cross-sectional view taken along the line “V-V” of FIG.

FIG. 5 is a schematic perspective view of a water pipe of an internal combustion engine showing a conventional technique of the present invention.

FIG. 6 is an enlarged plan view of a main part of a bent portion of the water pipe.

7 is an enlarged plan view of an essential part of a bent portion of the water pipe, which is taken along line V-V in FIG.

8 is a cross-sectional view taken along line V-V- in FIG.

[Explanation of symbols]

 2 Radiator 4 Water pipe 6 Radiator inlet hose 8 Thermostat cap 10 Radiator outlet pipe 12 1st fixed bracket 14 Cylinder block 16 2nd fixed bracket 18 Wire harness 20 Bracket 22 Clamp

Claims (1)

[Claims] 1. A water pipe of an internal combustion engine, which connects a radiator and a water pump to supply cooling water from the radiator to the water pump, fixes a part of a wire harness arranged in an engine room of the internal combustion engine. A water pipe for an internal combustion engine, wherein a bracket is provided, and a joint surface of the bracket is provided inside and inside the bent portion of the water pipe.