JPS6023589Y2 - Thermostat mounting structure - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mounting structure for a thermostat, and more particularly, to a mounting structure for a thermostat that is attached to an outlet of a cooling water passage of an engine.

Generally, it is important to maintain the temperature around the combustion chamber of an engine at an appropriate temperature from the viewpoint of engine drivability and durability.

For this purpose, a thermostat is a valve that is automatically operated depending on the engine coolant temperature and is usually installed at the coolant outlet of the cylinder head.

In other words, when the water temperature is low, the thermostat closes the valve and circulates the cooling water in a bypass circuit without going through the radiator, and when the water temperature rises, it opens the valve and circulates the cooling water to the radiator. ing.

Therefore, the thermostat is required to have little leakage when the valve is closed, and on the other hand, air escape holes are required when cooling water is injected into the cooling water passage and during engine operation.

However, when the thermostat is closed, water may leak from this hole into the radiator, making it take a long time to warm up, or in cold regions the phenomenon of moderate cooling may occur, or the heater may not work.

For this reason, a pendulum valve (hereinafter referred to as a jiggle valve) is used in the thermostat so that the air vent hole is sealed when a slight amount of water pressure is applied.

To explain the mounting structure of a conventional thermostat,
As shown in FIG. 1, a thermostat 1 is disposed at an outlet of a cooling water passage 3 of an engine 2. As shown in FIG.

In the figure, 4 is a radiator, 5 is a water pump, and 6 is a radiator hose for introducing cooling water from the radiator 4 into the cooling water passage of the engine 2.

Next, the mounting structure of the thermostat 1 is as shown in detail in FIG.
are sandwiched and attached to the housings 8 and 9 forming the cooling water passage 3.

Further, this thermostat 1 is installed in a horizontally extending cooling water passage 3 that connects the above-mentioned radiator 4 and the cooling water passage inside the engine 2, and as a result, the mounting flange 7 of the thermostat 1 is approximately vertical. (perpendicular to passageway 3).

In addition, 10 is the main body of the thermostat 1, 11 is a jiggle valve attached to the mounting flange 7 and opens and closes the air vent hole 12, and 13 is a bolt for connecting the housings 8 and 9.

Further, the main body 10 of the thermostat 10 is provided horizontally along the extending direction of the cooling water passage 3.

(For example, Sankaido Co., Ltd., published in July 1930, 1 Automotive Engineering Complete Book, Volume 4, Gasoline Engine - Pages 1352-358
Therefore, in such a conventional thermostat mounting structure, the jiggle valve 11 disposed on the annular mounting flange 7 is positioned below the cooling water passage 3 as shown in FIG. In this case, air removal during water injection becomes insufficient, and water injection performance also deteriorates.

However, in such a conventional thermostat mounting structure, there is no means or guide for positioning the jiggle valve 11 on both the mounting flange 7 and the housing 8 into which the flange 7 is fitted. As a result, the jiggle valve is likely to be misaligned during the thermostat installation process, making the process complicated and time consuming.

This idea was created by focusing on these conventional problems.In the mounting structure of a thermostat installed in a cooling water passage so that the mounting flange is approximately vertical,
The above problem can be solved by providing an engaging part and an engaged part on the mounting flange and the housing of the cooling water passage, respectively, which engage with each other to position the jiggle valve approximately at the top in the vertical direction within the cooling water passage. The purpose is to resolve the issue.

This invention will be explained below based on the drawings.

Figures 4 and 5 are diagrams showing an embodiment of this invention.

In the following description, the same reference numerals will be used for the same parts as in the prior art.

First, the configuration will be explained.

In FIG. 4, 8 indicates a housing on the engine side, for example, a cylinder block, and 9 indicates a radiator pipe connected to a radiator. These housing 8 and radiator pipe 9 are sealed with bolts 13 through gaskets 21. Fixed.

A cooling water passage 3 formed inside the housing 8 and the radiator pipe 9 extends approximately horizontally and circulates cooling water from the engine to the radiator, and a thermostat is installed at the connection part of the cooling water passage 3. 1 is attached.

The thermostat 1 includes a thermostat main body 10 having a valve for opening and closing the cooling water passage 3, an annular mounting flange 7 protruding from the thermostat main body 10,
It has a jiggle valve 11 that opens and closes an air hole 12 formed in the mounting flange 7 in response to water pressure.

This thermostat 1 is a so-called pellet type thermostat, and the outer edge of the mounting flange 7 is fitted into an annular notch 23 formed at the end of the housing 8. That is, the mounting flange 7 is connected to the housing 8 and the radiator pipe 9. It is attached to the cooling water passage 3 by being sandwiched between the two.

Therefore, the thermostat main body 10 is installed substantially horizontally along the extending direction of the cooling water passage 3, and the mounting flange 7 is installed approximately perpendicularly to the extending direction of the cooling water passage 3, that is, in a substantially vertical state. There is.

Here, as shown in detail in FIG. 5, in this invention, a projection 24 projecting radially outward is provided on the outer edge of the mounting flange 7, and this projection is provided in the annular notch 23 of the housing 8. Recesses 25 into which the recesses 24 are fitted are respectively formed.

The protrusion 24 is formed radially outward of the jiggle valve 11, and the recess 25 is formed at the uppermost portion of the annular cutout 23 in the vertical direction.

Therefore, these protrusions 24 and recesses 25 constitute a pair of engaging parts and engaged parts that position the jiggle valve 11 at the uppermost position in the vertical direction within the cooling water passage 3 by engaging (fitting) with each other. That means you are doing it.

In this embodiment, the protrusion (retaining portion) 24 is formed integrally with the mounting flange 7, but a separate member may be used.

When the thermostat 1 is to be assembled into the cooling water passage 3 on a production line, for example, the thermostat 1 is installed so that the protrusion 24 of the mounting flange 7 fits into the recess 25 of the housing 8 .

Therefore, the jiggle valve 11 is always disposed at the uppermost position of the cooling water passage 3.

Further, this assembly can be done in a short time and accurately.

It should be noted that, after assembly, the air removal operation when injecting water into the cooling water passage 3 can be performed extremely efficiently since the jiggle valve 11 is always at the uppermost position of the cooling water passage 3.

In the above-mentioned embodiment, the protrusion 24 was provided as the engaging part, and the recess 25 was provided as the secured part, but this invention is not limited to these, and a part of the mounting flange 7 is cut out, and the housing 8 is A detent may be provided corresponding to the notch.

Further, the position of the engaging portion is not limited to the radially outward side of the jiggle valve 11, and a plurality of retaining portions and engaged portions may be provided.

As explained above, according to this invention, the thermostat includes a thermostat body, a mounting flange protruding from the thermostat body, and a jiggle valve attached to the mounting flange, and the mounting flange is approximately In a thermostat mounting structure in which the thermostat is attached to a housing of a cooling water passage so that the thermostat is vertical, an engaging portion and an engaged portion that engage with each other to position the jiggle valve are respectively attached to the mounting flange. Since the jiggle valve is provided in the housing, the thermostat can be installed reliably and extremely quickly without causing any displacement of the jiggle valve during the thermostat installation process.

Additionally, as a result, air can be removed quickly and reliably during water injection, and water injection performance is uniformly improved among all engines.

Furthermore, in the embodiments described above, a conventional thermostat can be simply processed and is compatible with conventional products.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the mounting position of the thermostat, Figure 2
The figure is a cross-sectional view showing a conventional thermostat mounting structure, FIG. 3 is an explanatory diagram of its operation, FIG. 4 is a cross-sectional view taken in the direction of the ■ arrow in FIG. 4. FIG. 1...Thermostat, 3...Cooling water passage, 7...Mounting flange, 8...Housing, 1o...Thermostat body, 11
... Jiggle valve, 24 ... Protrusion (retaining part), 25 ... Concave part (engaged part).

Claims (1)

[Scope of utility model registration request] The thermostat includes a thermostat body, a mounting flange protruding from the thermostat body, and a jiggle valve attached to the mounting flange, and the thermostat is installed in a cooling water passage so that the mounting flange is substantially vertical. In the mounting structure of the thermostat attached to the housing, an engaging portion and an engaged portion that engage with each other to position the jiggle valve at the substantially uppermost position in the vertical direction within the cooling water passage are connected to the mounting flange and the housing, respectively. A thermostat mounting structure characterized by being provided in.