JP2636376B2 - Intake device for internal combustion engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for an internal combustion engine, and more particularly to an intake device for an internal combustion engine that can integrate an air cleaner case and a temperature control device.

[Related Art] An air cleaner is attached to an air intake port of a carburetor and removes dust in air taken into an internal combustion engine. Air cleaners include an oil bath type and a filter paper type. Filter paper type air cleaners have a high cleaning effect and are commonly used.

On the upstream side of the air cleaner, a temperature control device for manually or automatically sucking in hot air is mounted in order to improve the kinetic performance of the internal combustion engine in cold weather.

The air cleaner and the temperature control device are separately mounted as shown in FIGS. A cool air suction pipe 120 and a hot air suction pipe 116 are provided upstream of the temperature control device 106. An adjustment valve 124 is provided in the temperature control device 106 so as to adjust the amount of cold air to be drawn. The adjustment valve 124 is operated by a sensor unit 100 provided in the air cleaner 104.

The downstream side of the temperature control device 106 and the upstream side of the air cleaner 104 are connected by a first intake communication pipe 98. A second intake communication pipe 94 for supplying intake air to the carburetor 96 is provided downstream of the air cleaner 104,
An element member 92 and a sensor unit 100 are provided inside. The sensor unit 100 is made of a bimetal that is deformed by a change in temperature.

The sensor unit 100 and the temperature control device 106 are connected to the negative pressure pipe 90 so as to operate the adjustment valve 124 in the temperature control device 106. In the middle of the negative pressure pipe 90, a negative pressure delay valve (vacuum transmitting valve: VTV) 88 is provided so as to slow down the negative pressure fluctuation.

Japanese Utility Model Laid-Open Publication No. 61-126365 discloses that a passage cross-sectional area larger than the passage cross-section of the hot air passage is provided in the middle of the hot air passage so as to reduce the ventilation resistance and improve the noise reduction effect at the time of inhalation. There is disclosed an intake device for an internal combustion engine that is provided with an expansion chamber having the same and introduces hot air into a hot air passage and an air passage through the expansion chamber.

Furthermore, as an intake control device for an internal combustion engine,
It is disclosed in Japanese Patent Publication No. 12654. The one described in this publication senses the temperature of the cooling water of the internal combustion engine, and closes the hot air switching valve even when the intake air temperature is lower than the set temperature when the internal combustion engine is not warmed up. A cooling water temperature valve is provided in a second passage communicating between the negative pressure chamber and the atmospheric pressure.

[Problems to be Solved by the Invention] By the way, conventionally, in an intake device of an internal combustion engine, an air cleaner and a temperature control device are separately provided, and an intake communication pipe and a negative pressure pipe are used. Was connected. The adjustment valve in the temperature control device is operated via a negative pressure tube by a sensor provided in the air cleaner.

As a result, in the intake device of the internal combustion engine, there are disadvantages that the number of parts increases, the structure becomes complicated, the manufacturing becomes difficult, and the manufacturing cost increases, which is economically disadvantageous. Was.

Further, since the air cleaner and the temperature control device are configured separately, there is a disadvantage that the size of the air intake device is increased.

[Object of the Invention] Accordingly, an object of the present invention is to eliminate the above-mentioned inconvenience by providing a first suction pipe for introducing cold air and a second suction pipe for introducing hot air, which are provided side by side. The number of parts is reduced and the structure is simplified by providing the drive means for opening and closing by the first adjustment valve and the second adjustment valve and operating the first and second adjustment valves in the air cleaner case. It is another object of the present invention to realize an intake device for an internal combustion engine that can be easily manufactured, can be manufactured economically at a low manufacturing cost, and can be downsized.

[Means for Solving the Problems] In order to achieve this object, the present invention relates to an intake device for an internal combustion engine having a temperature control device for adjusting the amount of cold and hot air introduced into an air cleaner case. The first and second holes are arranged side by side, and a first cylindrical attachment member having one end protruding into the air cleaner case is fitted into the first hole, and one end is inserted into the second hole. A cylindrical second mounting member protruding into the air cleaner case is fitted and provided, and a cold air introduction first suction pipe is fixedly provided on the other end side of the first mounting member, and the other end of the second mounting member is provided. A second suction pipe for hot air introduction is fixedly provided on the side, a first adjusting valve inclined to close the first suction pipe for cold air introduction in cold weather is provided in the first mounting member; In the mounting member, cold A second adjusting valve, which is inclined so as to open the second intake pipe for introducing hot air when cold, is provided, and a rotating shaft to which the first adjusting valve and the second adjusting valve are fixed is connected to the first mounting member and the first adjusting member. A second mounting member is provided so as to penetrate from the side, and a clamping angle between the first adjustment valve and the second adjustment valve is set to a narrow angle when viewed from the axial direction of the rotation shaft.

According to the configuration of the present invention, when driving the internal combustion engine in cold weather, the first adjustment valve closes the first intake pipe for introducing cold air, and the second adjustment valve closes the second intake pipe for introducing hot air. The pipe is opened to supply hot air into the internal combustion engine. Further, when the internal combustion engine is warmed up, the first adjustment valve opens the first intake pipe for introducing the cold air, and the second adjustment valve closes the second intake pipe for introducing the hot air, so that the internal combustion engine is closed. Supplying cool air.

Embodiment An embodiment of the present invention will be described below in detail and specifically with reference to the drawings.

1 to 4 show an embodiment of the present invention.
1 to 4, reference numeral 2 denotes an intake device for an internal combustion engine (not shown), and reference numeral 4 denotes an air cleaner case. The air cleaner case 4 is integrally provided with a temperature controller 6.

On one side surface of the air cleaner case 4, first and second holes 8, 10 are provided side by side. The first hole 8 is provided with a cylindrical first attachment member 12 having a shape in which the lower side of one end side gradually projects into the air cleaner case 4. The second mounting portion 14 is provided with a cylindrical second mounting member 14 having a shape whose one upper side is gradually protruded into the air cleaner case 4.

A first suction pipe for introducing cold air is provided at the other end of the first mounting member 12.
16 is fixedly provided by a first fixing portion 18. At the other end of the second mounting member 14, a suction pipe 20 for introducing hot air is provided.
It is provided fixed by the fixing part 22.

In the first mounting member 12, there is provided a first adjusting valve 24 which is inclined so as to close the first intake pipe 16 for introducing cold air in cold weather. Also, a first adjusting valve is provided in the second mounting member 14.
There is provided a second adjusting valve 26 which crosses with 24 and is inclined so as to open the second inlet pipe 20 for introducing hot air in cold weather. At this time, the first adjustment valve 24 and the second adjustment valve 26 are fixed to one rotating shaft 28 while being held at a predetermined angle, for example, a crossing angle of 45 degrees. That is, the included angle 45 ° between the first adjustment valve 24 and the second adjustment valve 26 is set to be the included angle when viewed from the axial direction of the rotating shaft 28. As shown in FIG. 1, the rotating shaft 28 is provided to penetrate the first mounting member 12 and the second mounting member 14 from the side. Rotating shaft 28
One end 28a has a valve driving means which is a driving means made of a shape memory alloy for driving the first and second adjusting valves 24 and 26.
30 are provided.

The valve driving means 30 includes a bracket 32, a spring portion 34 inserted into the bracket 32, and a shape memory alloy spring portion.
36, and has a hysteresis with respect to the temperature as shown in FIG. That is, the shape memory alloy spring portion 36 has a change start temperature of, for example, 35 ° C., and exists at the position A in a normal state (35 ° C. or less) as shown in FIG. When the temperature reaches 35 ° C. or higher), it moves to the position B, and has a hysteresis with respect to the temperature as shown in FIG.

The bracket 32 is mounted in the air cleaner case 4. The rotating shaft 28 includes a spring portion 34 and a shape memory alloy spring portion.
36 penetrate the annular portions 34a, 34a formed respectively, and are connected to the spring portion 34 and the shape memory alloy spring portion 36 by ends.

That is, the valve driving means 30 is configured such that the annular portion 34a, 36a at the center between the spring portion 34 and the shape memory alloy spring portion 36 penetrates the end portion of the rotating shaft 28, and then the end portion of the rotating shaft 28. Is bent to lock the open end, which is the other end of the spring portion 34 and the shape memory alloy spring portion 36.

Reference numeral 38 denotes an attachment for connecting the second fixing portion 22 and the second attachment member 14.

 Next, the operation of this embodiment will be described.

In cold weather, for example, at a temperature of 35 ° C. or less, when the internal combustion engine is driven, the shape memory alloy spring portion 36 functions as a spring,
By the urging force of the spring portion 34 and the shape memory alloy spring portion 36, the first adjusting valve 24 closes the first suction pipe 16 for introducing cold air, and the second adjusting valve 26 closes the second suction pipe 20 for introducing hot air. Open to supply hot air to the internal combustion engine.

Also, when the internal combustion engine is warmed up and exceeds 35 ° C,
Only the urging force of the spring portion 34 acts, the first adjusting valve 24 opens the first suction pipe 16 for introducing cold air, and the second adjusting valve 26 closes the second suction pipe 20 for introducing hot air. Supplying cool air to

At this time, the spring portion 34 and the shape memory alloy spring portion 36 can arbitrarily change from digital rising to smooth rising.

As a result, a boost hose, a temperature sensor, and the like can be omitted as compared with a conventional intake device for an internal combustion engine, so that the number of parts is reduced, the configuration is simplified, manufacturing is facilitated, and manufacturing costs are reduced. To be economically advantageous.

In addition, since the temperature control device 6 conventionally provided separately from the air cleaner case 4 is integrally provided in the air cleaner case 4, the size of the intake device 2 is reduced, contributing to space saving of the intake system. can do.

Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various applications and modifications are possible.

For example, in the embodiment of the present invention, the angle between the first adjustment valve and the second adjustment valve is used while being held at 45 degrees, but the angle between the first adjustment valve and the second adjustment valve is arbitrarily set between 0 degrees and 90 degrees. It is also possible to use.

In the above embodiment, the first and second adjustment valves are automatically opened and closed by the spring portion and the shape memory alloy spring portion. However, the rotation axes of the first and second adjustment valves are extended in the axial direction. It is also possible to provide an extension and manually operate the first and second adjustment valves with the extension.

[Effects of the Invention] As apparent from the detailed description above, according to the present invention,
The air cleaner case has first and second holes arranged side by side.
A cylindrical first mounting member having one end protruding into the air cleaner case is fitted into the hole, and a cylindrical second mounting member having one end protruding into the air cleaner case is fitted into the second hole. A first suction pipe for introducing cold air is fixedly provided at the other end of the first mounting member, and a second suction pipe for introducing hot air is fixedly provided at the other end of the second mounting member. The first is inclined so as to close the first suction pipe for introducing cold air in cold weather.
An adjusting valve, a second adjusting valve intersecting the first adjusting valve and being inclined so as to open the second suction pipe for introducing hot air in cold weather is provided in the second mounting member, and the first adjusting valve and the second adjusting valve are provided. A rotating shaft to which the adjustment valve is fixed is provided to penetrate the first mounting member and the second mounting member from the side, and a clamping angle between the first adjusting valve and the second adjusting valve is set in the axial direction of the rotating shaft. Since the angle is set to be narrow, the number of parts can be reduced, the structure can be simplified, the production can be facilitated, and the production cost can be reduced to be economically advantageous.

Further, since the number of components of the intake device is reduced, the intake device can be easily reduced in size, which can contribute to space saving.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a configuration diagram of an intake device of an internal combustion engine, FIG. 2 is a cross-sectional view for explaining the operation of a second adjusting valve, and FIG. 3 is a shape memory alloy. FIG. 4 is a diagram for explaining the operation of the spring portion, and FIG. 4 is a diagram for explaining hysteresis with respect to temperature. 5 to 7 show a conventional intake device of an internal combustion engine, FIG. 5 is a configuration diagram of an intake device of the internal combustion engine, FIG. 6 is a perspective view of an air cleaner, and FIG. 7 is a perspective view of a temperature control device. . In the figure, 2 is an intake device, 4 is an air cleaner case,
6 is a temperature control device, 8 is a first hole, 10 is a second hole, and 12 is a first hole.
Mounting member, 14 is a second mounting member, 16 is a first suction pipe for introducing cold air, 20 is a second suction pipe for introducing hot air, 24 is a first adjusting valve,
26 is a first adjustment valve, 28 is a rotating shaft, 30 is valve driving means, 32 is a bracket, 34 is a spring portion, 36 is a shape memory alloy spring portion, and 38 is a fixture.

Claims (2)

(57) [Claims] 1. An air intake device for an internal combustion engine having a temperature control device for adjusting the amount of cold air to be introduced into an air cleaner case, wherein the air cleaner case has first and second holes arranged side by side. A first cylindrical mounting member having one end protruding into the air cleaner case is fitted into the hole, and a second cylindrical mounting member having one end protruding into the air cleaner case is fitted into the second hole. A first suction pipe for introducing cold air is fixedly provided on the other end of the first mounting member, and a second suction pipe for introducing hot air is fixedly provided on the other end of the second mounting member; A first adjusting valve which is inclined so as to close the cold air introduction first suction pipe in a cold state is provided in the first mounting member, and intersects with the first adjusting valve in the second mounting member in a cold state. Inclined so as to open the second suction pipe for introducing hot air A second adjustment valve, a rotation shaft to which the first adjustment valve and the second adjustment valve are fixed is provided through the first attachment member and the second attachment member from the side, and the first adjustment valve is provided. An intake device for an internal combustion engine, wherein an angle between the first adjustment valve and the second adjustment valve is set to a narrow angle when viewed from the axial direction of the rotation shaft. 2. The apparatus according to claim 1, wherein said first and second control valves are operated by a drive means made of a shape memory alloy having hysteresis with respect to temperature via said rotary shaft. An intake device for an internal combustion engine according to claim 1.