JP2523641Y2 - Throttle opener for internal combustion engine - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a throttle opener of an internal combustion engine, and more particularly to improvement of a cooling water passage of a wax pellet type throttle opener which opens a throttle valve at the time of warm-up or the like. .

<Conventional Technology> Conventionally, intake air flow rate control during idling in an engine intake system is performed, for example, as follows.

After the warm-up is completed, the opening of the idle speed control valve interposed in the passage bypassing the throttle valve is fed back to control the idle speed to the target speed for obtaining stable rotation while reducing fuel consumption. Control (Japanese
59-211738, etc.).

Also, when starting and warming up, a large air flow is required.Therefore, a throttle opener that detects the engine temperature and opens the throttle valve at low temperatures is provided, and both the throttle opener and the idle speed control valve secure the air flow. ing.

Here, a conventional intake control device for an internal combustion engine will be described with reference to FIGS. 4 and 5. FIG.

A throttle valve (not shown) is axially mounted on a throttle body 71 which forms a part of an intake passage of an internal combustion engine via a throttle shaft 72, and the opening of the throttle valve is changed via the shaft 72. Thus, the intake air flow rate of the engine can be variably controlled by changing the opening degree of the intake passage.

An accelerator drum 73 is provided at the end of the throttle shaft 72 so as to protrude out of the throttle body 71, and is linked to an accelerator pedal (not shown). The accelerator drum 73 is opposed to the return spring 74 so that the throttle shaft 73 and the throttle valve And rotate together.

Further, the piston 76 of the throttle opener 75 is in contact with the throttle opener drum 77, and the piston 76 strokes up and down in the drawing, whereby the throttle shaft 72 is rotated, and the idle speed during warm-up is secured. The required air flow rate is set to meet the requirements.

Here, a conventional throttle opener 75 for an internal combustion engine will be described with reference to FIG.

Inside the die cast body 81, a wax pellet 82 which expands and contracts due to temperature and causes a volume change is disposed with a gap 83 at a bottom 81a and a peripheral side portion 81b of the die cast body 81, and a piston 76 is provided at the center thereof. It is built in. The gap 83 communicates with a cooling water introduction path 84 for introducing cooling water, and a cooling water introduction path 85 for leading out the cooling water, and the cooling water introduction path 84 is connected to a portion of the wax pellet 82 opposite to the piston 76. Has an opening 86 below. On the other hand, the cooling water flowing into the gap 83 from the opening 86 uniformly warms the periphery of the wax pellet 82, thereby increasing the difference between the expansion and contraction of the wax pellet 82 as much as possible, and the responsiveness of the piston 76 stroke. In order to secure the cooling water outlet passage 85, an opening 87 is provided above the wax pellet 82 close to the piston 76.
have.

<Problem to be Solved by the Invention> However, in the conventional throttle opener, the cooling water passing through the cooling water outlet passage 85 heats the intake air in the intake pipe 78 to improve the startability. The cooling water outlet passage 85 needs to pass near the intake pipe 78, and in order to communicate with the opening 87 provided above, the cooling water outlet passage 85 extends through the die cast body 81 in the direction indicated by the arrow A. Perforated diagonally. For this reason, the process at the time of machining is complicated, and the production cost is increased.

Further, the cooling water introduced from the opening 86 through the cooling water introduction passage 84 does not uniformly warm the periphery of the wax pellet 82, and when the water level reaches the lower end 88 of the opening 87, the cooling water It may flow out to the lead-out path 85 and the upper portion of the wax pellet 82 cannot be reliably heated, and the above-described responsiveness may not be obtained. Further, since no cooling water is supplied, air is likely to accumulate around the upper portion of the wax pellet 82, and the responsiveness is further reduced.

In view of the above circumstances, the present invention provides wax pellets in the inner space of the main body, which drive the throttle valve in response to the temperature change of the cooling water introduced into the space, at the bottom and the peripheral side. It is an object of the present invention to provide a throttle opener for an internal combustion engine provided with a gap, which simplifies a cooling water passage and has excellent responsiveness.

<Means for Solving the Problems> For this reason, in the present invention, wax pellets for driving a throttle valve in response to a change in the temperature of engine cooling water introduced into the space are provided in the inner space of the main body. In a throttle opener of an internal combustion engine disposed with a gap in the portion, a gap is provided between the inner peripheral wall of the main body and the outer peripheral wall of the wax pellet, and an open end is extended to near the upper portion of the wax pellet. A cooling water introduction passage for introducing cooling water inside the annular wall while projecting the wall from the bottom of the main body;
A linear cooling water outlet passage for guiding the cooling water overflowing from the upper end of the annular wall to the outside along the intake passage wall from the lower part of the main body,
Is provided.

<Effect> In such a configuration, the cooling water introduced into the internal space of the main body by the cooling water introduction passage is provided with a gap between the wax pellet and the annular wall, a gap between the upper portion of the wax pellet and the open end of the annular wall, and The cooling water is led to the outside of the main body through the gap between the annular wall and the inner peripheral wall of the main body through the cooling water outlet passage. Here, since the cooling water outlet passage is provided in a straight line along the intake passage wall, when machining the cooling water outlet passage, it is sufficient to drill a hole at right angles to the throttle opener body, so that machining is easy. I can do it.

In addition, since the cooling water is led out through the gap between the wax pellet and the annular wall and the open end of the annular wall, the wax pellet responsive to the temperature change of the cooling water disposed inside the main body is surely brought to the upper part. It will be immersed in cooling water.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

 1 and 2 show a first embodiment of the present invention.

In the throttle opener 1, a wax pellet 3 which expands and contracts due to temperature and changes in volume is provided inside the die cast body 2 at the bottom 5 of the die cast body 2.
The peripheral part 8 is provided with a gap, and the piston 4 is incorporated in the center thereof. The die cast pod 2 is provided with a cooling water introduction passage 6 for introducing cooling water. The cooling water introduction passage 6 is provided at the bottom 5 of the die cast body 2 below the wax pellet 3 at a portion opposite to the piston 4. It has an opening 7.

In addition, below the peripheral side portion 8 of the die cast body 2,
A linear cooling water outlet passage 9 is provided for leading the cooling water in a direction perpendicular to the peripheral side portion 8.

Further, as shown in FIG. 2, a cup member 31 provided with a hole 33 having an inner diameter φd slightly larger than the outer diameter φD of the cooling water introduction passage 6 on the bottom surface 32 is provided in the hole 33. Is inserted, and the peripheral side surface 34 is located between the wax pellet 3 and the peripheral side portion 8 of the die cast body 2.
That is, the clearance C1 between the wax pellet 3 and the peripheral side surface 34 of the cup member 31, the peripheral side surface 34, and the peripheral side portion 8 of the die cast body 2
Is provided inside the die-cast body 2 with a gap C2 between them.

Here, the height h of the peripheral side surface 34 depends on the cup member 31 when the cup member 31 is disposed inside the die cast body 2.
Reference numeral 31 denotes a height which substantially covers the wax storage portion 3 a of the wax pellet 3, and the open end 35 extends to near the upper portion of the wax pellet 3.

 Next, the operation according to the above configuration will be described.

In such a configuration, the cooling water introduced into the die cast body 2 through the cooling water introduction passage 6 is introduced into the cup member 31 through the hole 33, and the wax pellet 3 and the peripheral side surface 34 of the cup member 31 are provided. Is provided below the peripheral side surface 8 of the die-cast body 2 through a clearance C2 between the peripheral side surface 34 and the peripheral side surface 8 of the die-cast body 2 through the gap C1 between the peripheral side surface 8 and the open side 35. The cooling water is led to the outside through the cooling water outlet 9.

That is, the peripheral side surface 34 of the cup member 31 corresponds to an annular wall protruding from the bottom 5 of the die cast body 2.

Therefore, the wax pellets 3 are surely immersed in the cooling water up to the upper part, so that the air does not accumulate and the upper part of the wax pellets 3 can be reliably heated. Accordingly, the periphery of the wax pellet 3 is uniformly heated, and the response of the stroke of the piston 4 can be secured.

Further, the cooling water outlet passage 9 is provided at a lower part of the die cast body 2 in a direction perpendicular to the peripheral side portion 8, so that the machinability is good and the manufacturing cost is reduced.

When the throttle opener 1 is attached to the intake control device of the internal combustion engine, the wall 10 of the cooling water outlet passage 9 is disposed so as to be in contact with the intake pipe. The air temperature can be increased, and the startability can be improved.

FIG. 3 shows a second embodiment of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the throttle opener 41 according to this embodiment, instead of disposing the cup member 31 as the annular wall, a rib having a length substantially equal to the height h of the peripheral side surface 34 from the bottom 5 of the die cast body 2 is used. 42 is directly projected.

In the present embodiment, the cooling water introduced into the die cast body 2 through the cooling water introduction passage 6 is introduced into the rib 42, passes through the gap C 3 between the wax pellet 3 and the rib 42, and It overflows more and is led out through a gap C4 between the rib 42 and the peripheral side surface 8 of the die cast body 2 to the outside through a cooling water outlet passage 9 provided below the peripheral side surface 8 of the die cast body 2. .

Therefore, also in the present embodiment, the periphery of the wax pellet 3 is uniformly warmed, so that the response of the stroke of the piston 4 can be ensured, and the temperature of the intake air in the intake pipe can be increased. It can be improved.

Also, the ribs 42 can be manufactured together with the die-cast body 2, which is advantageous in cost.

<Effects of the Invention> As described above, according to the present invention, in a throttle opener of an internal combustion engine in which wax pellets are arranged with a gap at a bottom portion and a peripheral side portion, an inner peripheral wall of a main body and an outer peripheral wall of a wax pellet are provided. A cooling water introduction passage for introducing cooling water into the inside of the annular wall while an annular end extending from the bottom of the main body and having an open end protruding near the upper part of the wax pellet is provided. A straight cooling water outlet channel is provided to guide the cooling water overflowing from the upper end of the wall to the outside along the intake passage wall from the lower part of the main body. While reducing the temperature, the intake air temperature in the intake pipe by the cooling water is raised to improve the startability, and the upper part of the wax pellet is immersed in the cooling water without fail. Thus, there is an effect that the wax pellets are uniformly warmed in the surroundings, so that stroke responsiveness can be secured.

[Brief description of the drawings]

FIG. 1 is a sectional view of a throttle opener showing a first embodiment of the present invention, FIG. 2 (a) is a plan view of a cup member according to the first embodiment, FIG. 1 (b) is a partial sectional view thereof, and FIG. FIG. 4 is a cross-sectional view of a throttle opener showing a second embodiment of the present invention, FIG. 4 is a schematic front view showing a conventional intake control device for an internal combustion engine, FIG. FIG. 1 ... Throttle opener, 2 ... Die-cast body, 3 ... Wax pellet, 4 ... Piston, 6 ...
Cooling water introduction passage, 9 ... cooling water outlet passage, 31 ... cup member, 35 ... open end, 42 ... rib

Claims (1)

(57) [Scope of request for utility model registration] A wax pellet for driving a throttle valve in response to a change in the temperature of engine cooling water introduced into the space is provided in the inner space of the main body with a gap at a bottom portion and a peripheral side portion. In a throttle opener of an internal combustion engine, a gap is provided between an inner peripheral wall of the main body and an outer peripheral wall of the wax pellet, and an annular wall whose open end is extended to near the upper portion of the wax pellet is projected from the bottom of the main body. A cooling water introduction passage for introducing cooling water to the inside of the wall; and a linear cooling water outlet passage for leading cooling water overflowing from the upper end of the annular wall to the outside from the lower portion of the main body along the intake passage wall. A throttle opener for an internal combustion engine.