JP2001271645A - Device for filling cooling water into internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for filling cooling water into internal combustion engines, preventing cooling water from getting blocked and running out during pouring cooling water. SOLUTION: A passage, below a valve seat 4 in a water inlet 6, is shortened by moving the position of a reservoir pipe 3 to a position, where the pipe 3 will not interfere with any other part of a water outlet 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine which is mounted on a top of a thermostat housing provided on a cylinder head of an internal combustion engine and in which cooling water is supplied to a water outlet provided in a water outlet forming a water passage leading to a radiator. Cooling water injection device.

[0002]

2. Description of the Related Art In a conventional water passage of an internal combustion engine cooling system, a water pump outlet is connected to a cylinder block. Water reaches the front of the cylinder head.

Cooling water enters the water outlet 1 provided at the top of the cylinder head from the front of the cylinder head via the thermostat housing with reference to FIGS. 4 and 5, and passes through the bend portion 5 indicated by an arrow. A technique is known in which the cooling water passes through a radiator hose (not shown) from an outlet pipe 2 and is cooled by a fin tube via an upper tank of the radiator, and cooling water collected in a lower tank returns to a water pump.

In addition, the water inlet 6 of the water outlet 1
Is fitted with a filler cap (not shown), and a spring load valve provided on the filler cap comes into contact with the valve seat 4 to stop the water. If the cooling water overflows, it is connected to a reservoir tank (not shown) via the reservoir pipe 3. Techniques for returning cooling water are also known.

[0005] In the prior art, the reservoir pipe 3 is connected to the outlet pipe 2 mainly due to manufacturing technology.
, And a space for mounting a tube to the reservoir pipe 3 is required, so that the gap d has a limit. Therefore, the throat portion 7 below the valve seat 4 of the water inlet 6 tends to be long.

Therefore, when water is injected, the cooling water injected from the water inlet 6 is supplied to the cooling system through the throat portion 7, but when the length L of the throat portion 7 is longer than the diameter D. May be difficult for the lower air to escape upward, especially when the length L is 1/2 or more of the diameter D. However, as described above, there is also a problem that it is difficult to lower the reservoir pipe 3 any more because the tube interferes downward.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and has been proposed to reduce the length of a throat portion of an internal combustion engine without interference of a reservoir pipe. It aims to provide a water injection device.

[0008]

SUMMARY OF THE INVENTION A cooling water injection device for an internal combustion engine according to the present invention is provided at a water outlet which is attached to a top of a thermostat housing provided on a cylinder head of the internal combustion engine and forms a water passage for cooling water to a radiator. In a cooling water injection device for an internal combustion engine that injects provided cooling water, a reservoir pipe connected to a reservoir tank is provided around a water injection port of the water injection device, and the reservoir pipe has a vertical surface including a pipe center line. The water outlet is configured to intersect with a vertical plane including the center line of the outlet pipe. With this configuration, the vertical distance between the reservoir pipe and the water outlet main body or the outlet pipe can be reduced without interfering with each other, so that the throat portion below the valve seat of the water inlet can be configured to be short. You can.

In practicing the present invention, it is preferable that the two perpendicular surfaces intersect at a substantially right angle. This is because the manufacturing operation, particularly the casting process, becomes more efficient.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, in FIG. 1-3, members having the same functions as those of the related art (FIGS. 4 and 5) are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is an external view of an internal combustion engine employing a cooling water injection device according to the present invention. A thermostat housing 11 is provided at the front of the cylinder head 10, and the water outlet 1 is attached to the top of the thermostat housing 11. Here, reference numeral 12 denotes a cylinder block, 13
Denotes a flywheel housing, 14 denotes an oil pan, 15 denotes a fuel injection pump, 16 denotes an air intake, 17 denotes an air compressor, 18 denotes a fan, and 19 denotes a fuel injection pipe.

FIG. 2 is a plan view of the water outlet 1. Referring to FIG. 3, which is a cross section taken along line AA of FIG. 2, the water outlet 1 has a mounting surface 1a mounted on the upper portion of the thermostat housing 11. An outlet pipe 2 is attached in parallel, and a water inlet 6 constituting a cooling water injection device is provided at an upper portion thereof.

A ring-shaped flange 9 is formed at the upper end of the water inlet 6, and a notch 9a is provided at a part of the flange 9 opposed to the ring 9 to provide a conventionally known bayonet-type locking device. Is configured to be attached.

The reservoir pipe 3 is provided on the outer periphery of the water inlet 6 such that a plane OA passing through the center of the outlet pipe 2 and perpendicular to the plane of the paper and a plane OB passing through the center of the reservoir pipe 3 and perpendicular to the plane of the drawing are orthogonal to each other. A sealing material is applied and driven into the boss 3a (shown by a dashed line) provided so that the vertical position is located above the valve seat 4. Here, reference numerals 1b and 1c respectively indicate reinforcing ribs.

The valve seat 4 inside the water inlet 6 is provided at substantially the same position as the top of the outer periphery of the outlet pipe 2. The length L of the throat portion 7 which extends downward from the valve seat 4 is water Considering the processing allowance for the valve seat 4 with respect to the basic thickness of the outlet 1
It is set to have a margin of about 5 to 1.5 m / m.

Further, since the reservoir pipe 3 does not interfere with any part of the water outlet 1, its height can be freely determined according to the position of the valve seat 4.

The operation and effect will be described below. When cooling water (including cooling water mixed with antifreeze) is injected into the cooling system, the length of the throat portion 7 is extremely short, and the lower air can easily escape from the surroundings at the time of injection, so that the injection is performed smoothly.

Accordingly, it is possible to prevent the cooling water from overflowing and spilling around, and to prevent the cooling water from taking a long time to be injected. Particularly, in the case of the cooling liquid containing the antifreeze, the cost is high, which contributes to the cost reduction. I can do it.

In the embodiment described above,
Water outlet mounting surface 1 from above the vehicle's takeout
Although the case where the distance H between the outlet pipe 2 and the outlet pipe 2 is large is shown, the same effect can be exerted even when the outer peripheral bottom portion of the outlet pipe 2 and the mounting surface are almost the same height as in the prior art. Productivity is good without any problem of time stamping.

[0020]

The present invention is configured as described above, and can provide the following excellent effects. (1) The cooling water flows smoothly without clogging at the water inlet, so there is no need to spill or take time. (2) The water outlet can be lowered to the top of the outlet pipe, so that the water outlet can be made compact and lightweight. (3) Therefore, it is possible to contribute to cost reduction during production and vehicle operation.

[Brief description of the drawings]

FIG. 1 is an overall view of an engine showing an embodiment of the present invention.

FIG. 2 is a plan view showing the water outlet of FIG.

FIG. 3 is a side sectional view of FIG. 2;

FIG. 4 is a plan view showing an example of the related art.

FIG. 5 is a side sectional view of FIG. 4;

[Explanation of symbols]

 1: Water outlet 2: Outlet pipe 3: Reservoir pipe 4: Valve seat 6: Water inlet 7: Throat

Claims (2)

[Claims] 1. A cooling water injection device for an internal combustion engine which is mounted on a top of a thermostat housing provided on a cylinder head of the internal combustion engine and in which cooling water is injected into a water outlet provided in a water outlet forming a water passage leading to a radiator. A reservoir pipe connected to a reservoir tank is provided on the outer periphery of a water inlet of the water injection device, and a vertical plane including a center line of the reservoir crosses a vertical plane including a center line of an outlet pipe of the water outlet. A cooling water injection device for an internal combustion engine, which is configured as described above. 2. The cooling water injection device for an internal combustion engine according to claim 1, wherein said two intersecting vertical surfaces intersect at a substantially right angle.