JPH02275013A - Intake device for engine - Google Patents

Abstract

PURPOSE:To prevent torsion of slide passages by connecting the slide passages, and supporting the center of the connecting part in a device which changes over characteristic frequency of an intake system through sliding the slide passages corresponding to intake passages. CONSTITUTION:Above a plural number of intake passages 12, air horns 17 for forming a long tube are arranged with a specified space by connecting respective flanges 16, 18 to many pillars 19. A plural number of change valves 15 which are provided with seal members 20, 21 on their up and down ends, are connected to each other by a center boss 27 through a plural number of connecting members 26. The center boss 27 is fitted to a guide pole 25 which is provided between both the flanges 16, 18 through a linear ball bearing 28 so as to slide freely in the vertical direction. Consequently, the respective change valves 15 is let down, for example, to bring respective seal members 21 into pressure contact with respective upstream opening parts 12a of respective intake passages 12, resulting in extension of the equivalent length of an intake tube.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an intake system for an engine equipped with a variable intake system that changes the natural frequency of the intake system by changing the equivalent length of the intake pipe, for example. It will open on.

(Prior Art) Conventionally, as an intake device for the above-mentioned engine, for example,
There is a device described in Japanese Utility Model Application Publication No. 56-2023.

That is, extension pipes serving as slide passages are slidably disposed on the outer periphery of the upstream portions of a plurality of fixed intake pipes of a multi-cylinder engine, and these extension pipes are connected to each other at a flange portion, and the flange portion This is a variable intake device for an engine that has a threaded shaft for sliding an extension tube in the middle of the engine.

In this conventional device, when multiple extension pipes are extended with respect to the fixed intake pipe by driving the screw shaft described above, the equivalent length of the intake pipe becomes longer, and the natural frequency of the intake system can be set lower. When the plurality of extension pipes are shortened with respect to the fixed intake pipe by driving the screw shaft described above, the equivalent length of the intake pipe is shortened, and the natural frequency of the intake system can be set high.

However, the conventional device described above has the following problems.

In other words, since the screw shaft mentioned above is a driving means for driving the extension tubes, during the extension operation of these extension tubes, a rotational moment is applied to the plurality of extension tubes B, 2 in the direction of extension rotation of the screw shaft. When the extension tubes are shortened, the extension tubes are twisted in one direction, and conversely, when the extension tubes are shortened, the extension tubes are twisted in one direction. The problem is that it is difficult to ensure a good seal between the fixed intake pipe and the extension pipes because the extension pipes are twisted in the other direction due to the rotational moment in the direction of shortened rotation of the screw shaft. was there.

(Objective of the Invention) The present invention provides an engine that has a simple structure but can prevent twisting of the slide passage and ensure excellent sealing performance when changing the natural frequency of the intake passage. The purpose is to provide intake equipment.

(Structure of the Invention) This invention provides an engine intake system in which a slide passage is provided in each Miura of a plurality of intake passages of a multi-cylinder engine, and two sets of slide passages are slid to switch the natural frequency of the intake system. -1: Connecting the plurality of slide passages with a connecting member; 7. In the middle part of the two sets of connecting members; regulating twisting of the slide passages and allowing each slide passage to slide. The invention is characterized in that it is an intake system for an engine, in which a guiding support member is disposed to support the engine.

(Effects of the Invention) According to the present invention, although the structure is simple and includes a connecting member that connects a plurality of slide passages and the above-mentioned guiding support member disposed at an intermediate portion of this connecting member, a plurality of slide passages can be connected. Since the above-mentioned guiding support member can reliably prevent the slide passages from sagging when the passages slide, good sealing performance can be ensured when changing the natural frequency of the intake passage. It has the effect of

(Example) An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows a variable intake system for a multi-cylinder rotary piston engine, in which in FIG. An intake boat 3 and an exhaust boat 4 are formed, and a trailing side spark plug 5T and a leading side spark plug 5L are respectively disposed on the other side.

In the rotor housing 1 described above, a rotor 8 is provided which moves eccentrically about an axis 7 by means of an eccentric shaft 6.

This rotor 8 has a trilobal inner envelope surface 9, and an apex seal 10 is attached to one rotor apex.

Multi-cylinder rotary piston engine 1 configured in this way
Each intake boat 3 of 1 has an intake passage 12.
... are connected 17, and each of these intake passages 12 ... has a throttle body 13 incorporating a slide valve type throttle valve, and a fuel injection valve located upstream of the above-mentioned throttle valve to improve vaporization and atomization characteristics. 14 are arranged respectively.

An i=J variable intake system is provided upstream of the above-mentioned intake passage 12 to change the natural frequency of the intake system depending on the engine operating state.

That is, a switching valve 15.15 having a slide passage structure is provided corresponding to the Miura end of each of the above-mentioned intake passages 12, and as shown in FIGS. upwardly away from the upstream openings 12a, 12a of the corresponding intake passages 12.12,
By shortening the length of the intake pipe and setting the natural frequency of the intake passage high, as shown in Figs. Upstream opening] 2a and 12a, the intake pipe length can be reduced to length<1. The engine has a naturally aspirated variable intake system that sets the natural frequency of the intake passage low.

Here, the upstream portion 11 of the above-mentioned intake passages 12, 1.2
A flange 1G is integrally formed on the outer side of 2a and 12a, while two air horns for forming a long tube], 7.17
A flange 18 is formed on the outer side of the upper end of the
The above-mentioned air horn 17.17 is connected to the Miura open bottom part 1.2 of the intake passage 12 by a total of four wooden supports 19 stretched between the corner parts of the bottom flange i8.16.
With respect to a, move it away to one side (fix and support it in the 7 position).

The above-mentioned switching valve 1.5. i5 has seal portions M20.21 at both its upper and lower ends, and these seal members 20.
By moving up and down along the outer periphery of the above-mentioned horn 17 along with the horn 17, the natural frequency of the intake passage is changed.

Here, connect the dual switching valves 15 and 15 to the intake passage 1.
2.12, the switching valve 15.
15 through the upper sealing member 21.21 these switching valves 15.15 are connected to the intake passage 12.12'-flow rate [
The first part 12a has a pressure welding structure in which the first part 12a is brought into pressure contact with the first part 12a.

Further, as shown in FIG. 6, bolts 23 and 24 are used to connect the center part of the -L side flange 18 and the ball support part 22 formed on the center lower surface of the lower flange 16. - Attach the guide pole 25, and use this guide pole 25 located outside the intake passage to switch between the two switching valves 1.
5.15-L is configured to guide the lower sliding movement.

The switching valves 15 and 15 of Zunawaji and 2-) are connected to each other via a connecting member 26 and a connecting boss 27 at the center of the valve, and this connecting boss 27 is connected to the above-mentioned connection via a near ball bearing 28. By vertically slidingly fitting into the guide ball 25 of the switching valve i5.15, it guides the vertical sliding of the switching valve i5.15, and also guides the vertical sliding of the switching valve i5.
1. The structure 17 is designed to prevent twisting of J.

Furthermore, a wire end 29, 29 as a stopper for the wire end is disposed within the connection boss 27 mentioned above. Note that a retainer is fitted into the 4th side of the wire ends 29 and 29 to prevent the wire from falling off when the wire is cut. and the wires 3 latched to these wire ends 29.29 in a centrally symmetrical position between the switching valves 15.15.
0.31 by a DC motor 32 with a speed reducer having a variable speed reversible rotation structure, the switching valve 1 described above can be operated.
5, 1.5 is configured to switch between the high speed side (see Figures 2 and 3) and the low speed side (see Figures 4 and 5). I'm here.

The above-mentioned motor 32 is mounted on the base frame 3 as shown in FIG.
A driven plate 37 (so-called motor pulley) is fitted onto the rotating shaft 36 of the motor 32, and one end of the above-mentioned one wire 30 is connected to the wire end 38.
It is attached to the driven plate 37 via a wire end 39, and one end of the other wire 31 mentioned above is attached to the driven plate 37 via a wire end 39.

In addition, a spring 40 is applied to the two driven plates 37, and the spring 40 connects the two switching valves 15 and 15 to the high speed side via the driven plate 37 and the wire 30. It is spring biased.

The illustrated embodiment is constructed as described above, and its operation will be explained below.

Switching valve 15.1 in the open state shown in FIGS. 1 to 3
5, as shown in FIG. 4 and FIG.
Rotate counterclockwise as shown in the figure.

Due to the above-mentioned motor control, one wire 30 is extended and the other wire 31 is indexed through the driven plate 37, so that the plurality of switching valves 15, 15 simultaneously move down along the central guide ball 25, As shown in FIGS. 4 and 5, the seal member 21.21 is press-fitted E2 to the tapered cone-shaped upstream openings 12a, 1.2a of the plurality of intake passages 12.12, and the equivalent length of the intake pipe becomes longer. .

Here, when the plurality of switching valves 15, 1.5 mentioned above are sliding and joining, each of these switching valves 15.15
Since the guide ball 25 reliably prevents twisting, it is possible to ensure good sealing performance when the switching valve is closed.

In addition, the rotation mode-end around the guide ball 25 of each of the above-mentioned switching valves 15 and 15 is the same as that of the switching valve 1.
The sealing members 20 and 21 provided above and below 5 can ensure reliable regulation.

C1 Regarding the correspondence between the structure of the present invention and the embodiment described in L, the multi-cylinder engine of the present invention corresponds to the multi-cylinder rotary piston engine 11 of the embodiment, and similarly below, the slide passage is connected to the switching valve 15. Correspondence 17, the connecting member corresponds to the connecting member 2G and the connecting boss 2712, and the guide support #shrine corresponds to the guide ball 25, but this invention is limited only to the configuration of the embodiment described above. It can also be applied to reciprocating engines.

Furthermore, instead of the variable intake system that switches the natural frequency of the intake system and the structure of the embodiment in which the slide passage is connected to and separated from the flow port at the negative side of the intake passage, a so-called trompon structure is used in which the slide passage is expanded and contracted. It may be a variable intake system.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is an overall view showing a variable intake system for a multi-cylinder rotary piston engine, Fig. 2 is an explanatory diagram when the switching valve is open, and Fig. 3 is an illustration when the switching valve is open. Cross-sectional view, Figure 4 is an explanatory diagram when the switching valve is closed, Figure 5 is a cross-sectional view when the switching valve is closed, Figure 6 is a cross-sectional view taken along the line Vll-VI in Figure 2, and Figure 7 is a diagram showing the switching valve. It is an enlarged view of a drive motor. 1j...Multi-cylinder low Talibiston engine 12...
・Intake passage 15...Switching valve 25...Guide ball 26...Connection member 27...Connection boss Fig. 2■-'' 12.Intake passage 15...fJJ Hano L Bu Intake Pilgrimage No. 6 Figure 12... D and air pick-up path 15... to the sword exchange half 25 power point book 0-rule 21 fL connection path Figure 7

Claims (1)

[Claims] (1) An intake system for an engine in which a slide passage is provided upstream of each of a plurality of intake passages of a multi-cylinder engine, and the natural frequency of the intake system is switched by sliding the slide passage, the plurality of slide passages An intake system for an engine, wherein the connecting members are connected by a connecting member, and a guiding support member is disposed at an intermediate portion of the connecting member to restrict twisting of the slide passages and to slidably support each slide passage.