JP2548602Y2 - Throttle body heat insulator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat retaining device for a throttle body used for an intake device of a vehicle.

[0002]

2. Description of the Related Art Throttle valves used in automobiles and motorcycles may freeze during low-load operation of the engine and hinder the control of the engine. Therefore, some measures have been taken to prevent freezing. For example,
As disclosed in JP-A-125349, a heat receiving portion is provided on the outer surface of a guide cylinder of a throttle valve, and connected to a heat generating portion of the engine via a heat conducting member of the heat receiving portion, whereby heat of the engine is received by the heat receiving portion. In some cases, the throttle valve is prevented from freezing by conducting the heat to the guide cylinder of the throttle valve through the heat conducting member. Although this anti-freezing measure was effective for motorcycles, it was difficult to apply to automobiles.

FIGS. 3 and 4 show a measure for preventing freezing of a throttle valve housed in a throttle body of an automobile.
There is a throttle body heat retaining device having a configuration shown in FIG.
In FIG. 1, reference numeral 1 denotes a throttle body, and a main intake passage 2 connected to an air cleaner (not shown) is provided at the center of the throttle body 1. The main intake passage 2 is provided with a throttle valve 3 that rotates around an axis XX crossing the center of the main intake passage 2 to adjust the intake flow rate.

An air bypass passage 4 for controlling the idling speed is connected to the main intake passage 2. The air bypass passage 4 is connected to air bypass side passages 4a and 4b distributed to both sides of the main intake passage 2 to secure a bypass air flow during idling. An idle speed control valve 5 is provided in the air bypass passage 4 . A baffle plate 6 is attached near the inlet of the air bypass passage 4 in order to make it difficult for water, dust and the like to enter the idling speed control valve 5.
Further, as a measure for preventing freezing of the throttle valve 3, a hot water heating chamber 7 is provided near the lower surface of the main intake passage 2 by an air cleaner with respect to the air bypass passage 4.

[0005]

However, in the above configuration, the air bypass side passage 4 provided to secure the bypass air flow during idling as described above.
Due to the presence of a and 4b, the area in which the hot water heating chamber 7 can approach the main intake passage 2 is limited as shown by oblique lines. Therefore, the effect of the freezing countermeasure by the hot water heating chamber 7 is reduced by half, and an additional countermeasure for turning the hot water to other parts is often required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat retaining device for a throttle body which has been made in view of the above drawbacks, improves the effect of measures against freezing of a throttle valve, and does not require any extra measures.

[0007]

According to the present invention, as a means for solving the above problems, an air bypass passage for controlling an idling speed is connected to a main intake passage containing a throttle valve, and the main intake passage is provided. A heating fluid chamber provided in close proximity to the throttle body, wherein the air bypass passage is biased to communicate with a part of the main intake passage, and a portion of the throttle body not having the air bypass passage is provided with the air bypass passage. The heating fluid chamber is provided so as to surround the air bypass passage and extend in the length direction of the air bypass passage.

[0008]

As described above, the main intake air flows through the air bypass passage.
Communicate with a part of the passage biased, and adjust the throttle body
A heating fluid chamber is provided in the area without the bypass passage,
A thermal fluid chamber surrounds the air bypass passage and
By extending along the length of the path
Heat exchange between the volume of the heating fluid chamber and the main intake passage.
That the area can be increased, because it is possible to enlarge the portion over the front and rear of the throttle valve, it is possible to improve the effect of freezing measures of the throttle valve
You.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Note that the same members as those in the above-described drawings are denoted by the same reference numerals, and description thereof will be omitted.

The air bypass passage 4 is connected to the main intake passage 2
It is partially biased and communicates, which results in
Portion of throttle body 1 without air bypass passage 4
The hot water heating chamber 7, which is a heating fluid chamber, is
Surrounds the bypass passage 4 and has the length of the air bypass passage 4
It is provided so as to extend also in the direction of the arrow. Air bypass passage
4 is an air bypass side passage opening only at the upper right side of FIG.
It is connected to road 4c. The passage area of the air bypass side passage 4c is enlarged in the radial direction with respect to the main intake passage 2 , that is, in the outward direction . Thereby, the passage area of the bypass air can be increased by the one shown in FIGS.
It can be about the same.

The hot water heating chamber 7 is provided near the lower half of the main intake passage 2 and has a shape as shown in FIG.
In addition, it is formed in an L shape when viewed from below. That is, the hot water heating chamber 7 has a portion 7a formed in the direction crossing the main intake passage 2 closer to the air cleaner than the throttle valve 3, and the other side of the main intake passage 2 described above, that is, FIG.
And a portion 7b sandwiching the throttle valve 3 in the front-rear direction along the main intake passage 2. These two portions 7a and 7b are formed with a predetermined depth in the vertical direction . This enables the hot water heating chamber
7 surrounds the air bypass passage 4 and has an air bypass
This also extends in the longitudinal direction of the passage 4. Hot water heating room
A pipe 8 communicating with an external hot water source is connected to both portions 7a and 7b of the pipe 7, so that hot water can be circulated.

With the above configuration, the main intake passage 2 close to the hot water heating chamber 7 is heated by the hot water introduced from the external hot water source through the pipe 8 into the hot water heating chamber 7.
And the throttle valve 3 is heated. Therefore,
It is possible to efficiently prevent the throttle valve 3 from freezing in an idling state or the like.

In the embodiment described above, a hot water heating chamber using hot water has been described as an example of the means for keeping the temperature of the throttle body warm. However, an oil heating chamber using hot oil may be formed in the same manner as the embodiment. Good.

[0014]

[Effects of the present invention] As is clear from the above description, the present invention
Now, bias the air bypass passage to part of the main intake passage
Communication with the
Place the heated fluid chamber in the area without the
Surrounding the road and extending the length of the air bypass passage.
It can be provided so as to fit. By this
As a result, the heating fluid chamber can be enlarged , and the heat receiving area of the main intake passage can be increased . In particular, since the portion corresponding to the throttle valve can be expanded so as to cover the portion, a heat retaining device for the throttle body that can prevent the freezing of the throttle valve beforehand can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic bottom view of FIG.

FIG. 3 is a sectional view showing a conventional technique.

FIG. 4 is a schematic bottom view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Throttle body 2 Main intake passage 3 Throttle valve 4 Air bypass passage 4c Air bypass side passage 7 Hot water heating chamber

Claims (1)

(57) [Scope of request for utility model registration] An air bypass passage for controlling an idling speed is provided in a main intake passage containing a throttle valve.
In the heat retaining device for a throttle body provided with a heating fluid chamber in close communication with the main intake passage, the air bypass passage may be a part of the main intake passage.
And the airbag of the throttle body
The heating fluid chamber is provided with an air
Encloses the path passage and the length of the air bypass passage
A heat retaining device for a throttle body, characterized in that it is provided so as to extend also to the throttle body.