JPS6312822A - Intake air pipe length variable device - Google Patents

Abstract

PURPOSE:To form a constituting part integrally with a case bottom plate and to facilitate assembly and mounting of a titled device, by a method wherein a stationary intake air pipe, a moving intake air pipe, and the drive parts of the moving intake air pipe are attached to the case bottom plate of an air cleaner. CONSTITUTION:A variable combustion regulating type carburetor 3 is connected to an intake manifold 2 of an engine 1, and the end part on the upper stream side of a carburetor 3 is connected to a guide pipe 5 through a stationary intake air pipe 4. The end part on the upper stream side of the guide pipe 5 is supported to a stay 7 in an air cleaner case 6, and the stay 7 is secured to a case bottom plate 8. In this case, drive system parts, i.e. an arm shaft 10 and its gear 11, a drum shaft 13 and its gear 12, a drum 14, a servo motor 17, and an arm 18, are mounted to the case bottom plate 8. The case bottom plate 8, forming an assembly part as described above, is connected to the intake manifold 2, and a title variable device is mounted in a manner described above.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an intake pipe length variable device for motorcycles and the like, and particularly to a structure that simplifies the support and installation thereof.

[Prior Art] A variable intake pipe used in the intake system of an engine is a well-known device that changes the length of the intake pipe depending on the rotational speed of the engine. That is, the length of the intake pipe is adjusted to be short at high speeds, and lengthened at low speeds, thereby ensuring an optimum amount of air supply at all times. An example of such a device is the one described in Japanese Patent Laid-Open No. 61-49124.

This type of variable intake pipe has a fixed intake pipe and a movable intake pipe, and generally requires a servo motor or the like as a drive system component to drive the latter and adjust the length of the intake pipe. These drive system components, such as the servo motor, are attached to a location other than the engine, such as the vehicle body frame.

[Problems to be Solved by the Invention] However, it is difficult to move the variable intake pipe, which consists of a fixed intake pipe and a movable intake pipe, and its drive system components (hereinafter collectively referred to as the variable intake pipe length device) to the engine side, which has a complex structure and is difficult to handle. If it were to be incorporated, the assembly work would be more sophisticated and require more skill. Furthermore, if the servo motor is separated from other intake pipe length variable device components and installed on a separate part from the engine, such as the car body frame, the wire connections and adjustment work between the servo motor and other drive system parts will be difficult. This must be done after the pipe length variable device is assembled.

However, this work requires a high degree of skill for connection and adjustment work, since it is necessary to work in a place where a large number of parts are installed in a narrow space.

Therefore, in the present invention, the intake pipe length variable device is installed as a sub-assembly on the bottom plate of the air cleaner case, regardless of the engine.
(hereinafter referred to as complete), it simplifies the assembly of the variable intake pipe length device, and at the same time simplifies the engine assembly of the variable intake pipe length device, and also simplifies the connection of parts in the drive section of the variable intake pipe length device and the adjustment work. The purpose is to

[Means for solving problems] The variable intake pipe of the present invention has the following configuration.

That is, it has a fixed intake pipe and a movable intake pipe that can communicate with the carburetor connected to the intake manifold of the engine, and whose end portion is enclosed in the air cleaner case, and the fixed intake pipe is connected to the intake manifold of the engine according to the rotational speed of the engine. In an intake pipe length variable device that connects and separates a pipe and a movable intake pipe, the fixed intake pipe, the movable intake pipe, and drive system components of the movable intake pipe are attached to the air cleaner bottom plate fixed to the air cleaner case. It is characterized by this.

[Operation of the Invention] The variable intake pipe length device according to the present invention is sub-assembly attached to the bottom plate of the air cleaner, thereby making it a complete device. Therefore, by connecting the air cleaner bottom plate to the engine's intake manifold, the complete intake pipe length variable device is integrated with the engine.

[Embodiment] Figs. 1 to 4 show an embodiment of a variable intake pipe for a motorcycle according to the present invention. The variable intake pipe length device in this embodiment has a drive system using a gear train, and uses a variable twist type carburetor as the carburetor.

FIG. 1 is a side view of an engine intake system, with a portion thereof cut away to mainly show the variable intake pipe portion. That is, a variable twist type carburetor 3 is disposed connected to an intake manifold 2 provided at the intake port of the engine 1, and the upstream end of the variable twist type carburetor 3 is connected to a fixed intake pipe 4.
It is connected to the guide tube 5 via. The variable twist type carburetor 3 has a plurality of main jets, which are selectively operated according to the engine speed to adjust the amount of fuel supplied.More details will be described later.

The upstream end of the guide pipe 5 is inserted into an air cleaner case 6 and supported by an intake pipe stay 7. The intake pipe stay 7 is connected to the air cleaner bottom plate 8 of the air cleaner case 6.
It is fixed by a bolt 9a. The fixed intake pipe 4 is also collinear with the variable twist type carburetor 3 to the air cleaner bottom plate 8 by means of 9b. Therefore, the variable twist type carburetor 3 is also attached to the air cleaner bottom plate 8 in advance.

Further, the drive system components of the intake pipe length variable device are attached to the air cleaner bottom plate 8 as a subassembly. The drive system components of the variable intake pipe in this embodiment include an arm shaft 10, an arm shaft gear 11, and a drum shaft gear 1.
2, drum shaft 13, drum 14, servo motor 1
7 and the arm 1 integrated into the arm shaft 10
There is an 8th grade. All of these are attached to the air cleaner bottom plate 8 in advance.

The arm shaft 10 is disposed within the air cleaner case 6 and is rotatably supported by a stay 19 fixed to the air cleaner bottom plate 8.

Further, an arm shaft gear 11 is fixed to the arm shaft 10.

The drum shaft 13 is rotatably supported by a stay 20 fixed to the air cleaner bottom plate 8, and a drum shaft gear 12 and a drum 14 located outside the air cleaner case 6 are fixed. Note that the drum shaft gear 12 is meshed with the arm shaft gear 11. The tram shaft gear 12 is the arm shaft gear 11
This gear has a larger diameter, and a gear train consisting of both forms a speed reduction mechanism.

The surge tank 15 is attached to the air cleaner bottom plate 8 by a surge tank stay, which will be described later, the solenoid 16 is attached to a solenoid stay 21, and the servo motor 17 is attached to a boss 22. Details regarding these will be described later. In the figure, 23 is a negative pressure pipe, and 24
is a wire holder.

As described above, the variable twist type carburetor 3, the fixed intake pipe 4 which is an intake pipe length variable device, the guide pipe 5, and its drive system components are integrally attached to the air cleaner bottom plate 8 to form a complete air cleaner.

Next, the detailed structure of the variable intake pipe will be explained. A gap 25 is provided between the downstream end of the guide pipe 5 and the fixed intake pipe 4,
Furthermore, the slider 2 is arranged so that this gap 25 can be opened and closed.
6 is sheathed on one end of the guide tube 5. A protrusion 27 that protrudes laterally is provided on the outside of the slider 26, and this protrusion 27 engages with a fork 28 formed at the tip of the arm 18.

The slider 26 is a ring-shaped member that is slidably mounted on the end of the guide tube 5, forms a movable intake pipe in cooperation with the guide tube 5, and is capable of interlocking with the arm 18. When the arm 18 rotates, the protrusion 27 of the slider 26 that engages with the fork 28 is carried away, so the slider 26
slides on the guide tube 5 to the position shown by the two-dot chain line in the figure. Therefore, the gap 25 can be opened and closed depending on the slider position.

Next, the structure of the variable twist type vaporizer 3 will be outlined. The venturi portion 29 of the variable twist type carburetor 3 is provided with a piston valve 31 that can be moved up and down from above the housing 30 of the carburetor. A jet needle 32 is provided at the center of the bottom of the piston valve 31, and a suction hole 33 is opened on the downstream side and communicates with a suction chamber 34 inside the piston valve 31. The suction chamber 34 is separated from the atmospheric pressure by a diaphragm 35, and inside thereof, the upper part of the piston valve 31 is supported via a return spring 36.

The jet needle 32 is arranged so that the opening degree of the outlet portion of the main nozzle 38 extending from the float chamber 37 can be adjusted. The float chamber 37 is a space formed between the housing 30 and the cover 39, and fuel is sent there. Further, one end of the main nozzle 38 is protruded into the float chamber 37, and the first main jet 4 is inserted therein.
0 and a second main jet 41 are provided. 1st
The main jet 40 is normally open, and the second main jet 41 is controlled to be open at low speeds and closed only at high speeds. That is, an on-off valve 43 attached to a diaphragm 42 is provided at the tip of the second main jet 41, and this on-off valve 43 is connected to the negative pressure pipe 23 to be opened and closed. The negative pressure pipe 23 communicates with the intake manifold 2 via a solenoid 16 whose opening and closing are controlled by a control box, which will be described later, so that the negative pressure of the intake manifold 2 closes the second main jet 41 via an on-off valve 43. It has become. Therefore, the second main jet 41 is adjusted so that when the engine speeds are low and the engine does not reach a predetermined speed, negative pressure is not applied from the negative pressure pipe 23 and the second main jet 41 is open, and when the engine speeds up, negative pressure is applied and the second main jet 41 is closed. ing. Note that 44 is a butterfly type throttle valve.

FIG. 2 is a view taken in the X direction of FIG. 1, and shows the mounting structure of drive system components such as the surge tank 15, solenoid 16, and servo motor 17. That is, surge tank 15
and the solenoid 16 are respectively connected to the surge tank stay 4.
5 and a solenoid stay 21, the external part is fixed to the air cleaner bottom plate 8. Further, the servo motor 17 is also fastened to the boss 22 extending from the air cleaner bottom plate 8 by bolts 46. Further, a wire 47 having one end connected to the servo motor 17 has the other end connected to the drum 14 via a holder 24 supported by a wire stay 48 fixed to the air cleaner bottom plate 8. The drum 14 is connected to the servo motor 1 transmitted from the other end of the wire 47.
It is driven by the rotational output of 7.

Note that the surge tank 15 is connected to an intake manifold and a solenoid 16. The solenoid 16 is connected through a communication portion 49 to a negative pressure pipe that operates the on-off valve of the second main jet, and is connected to the control box 5.
Connected to 0.

Reference numeral 49a denotes an atmosphere opening port of the solenoid 16.

The control box 50 is also connected to the servo motor 17, detects the rotational speed of the engine, and controls the rotation of the servo motor 17 and the opening/closing of the solenoid 16 by a built-in control circuit.

FIG. 3 is a view taken in the Y direction of FIG. 1, with a portion cut away to show the drive system of the variable intake pipe. That is, an arm shaft gear 11 is fixed to one end of an arm shaft 10 rotatably supported by the air cleaner bottom plate 8, and two arms 18 are attached to both ends. So drum 14
When is driven to rotate, the drum shaft gear 12 provided on the drum shaft 13 to which the drum 14 is fixed rotates integrally, and the arm shirts 1 to gibs '11 that mesh with the drum shaft gear 12 rotate integrally.
is rotated. As a result, the arm shaft 10 rotates,
At the same time, the arm 18 is also rotated.

Note that each arm 18 is capable of adjusting the movement of two guide tubes 5 at the same time. That is, as shown in FIG. 4, two guide tubes 5 are arranged in parallel, and the bridge 51 connects and supports the sliders 26 that are fitted onto each, so that two sliders 26 are integrated. There is. At the intermediate portion of the slider 26 there are projecting portions 27 which are formed to protrude from each other and are opposed to each other, and these are fitted into the forked portion 28 at the tip of the arm 18 . Therefore, when the arm 18 rotates together with the rotation of the arm shaft 10, the two sliders 26 are moved in conjunction with each other.

Next, the operation of the embodiment will be explained. First, switching the length of the intake pipe will be explained. Figure 1 shows the condition when driving at low speed.
The slider 26 is located at the leftmost position in the figure, contacts the fixed intake pipe 4, and closes the gap 25. Therefore, since the air enters from the right end of the guide tube 5, the path of the air becomes longer, and the inertial effect of the intake air can be effectively utilized, increasing the driving force during low-speed running.

On the other hand, when driving at high speeds, the engine speed increases, making it impossible to utilize the inertia effect of intake air. When a certain number of rotations is reached, as shown in FIG. Rotate. This causes wire 4
7 is pulled, and the drum 14 is rotated. Then, the force for rotating the drum 14 is transmitted from the drum shaft gear 12 to the arm shaft gear 11 at a reduced speed, and the arm shaft 10 and the arm 18 integrated therewith are rotated. Then, as shown by the two-dot chain line in FIG. 1, the arm 18 rotates to the right in the figure, and at the same time, the protrusion 27 of the slider 26 that engages with the fork 28 of the arm 18 is carried away, so that the slider 26 moves over the guide tube 5 to the right in the figure to open the gap 25. Then, air is drawn into the interior through the gap 25 as indicated by the white arrow, and the intake stroke is shortened.

As a result, it becomes possible to utilize the inertia effect, making it suitable for high-speed driving.

Next, in order to attach the variable intake pipe length device to the variable twist type carburetor 3, first prepare the above-mentioned complete assembly in which the variable twist type carburetor 3 and the variable intake pipe length device are sub-assembled to the air cleaner bottom plate 8. Next, as shown in FIG. 1, the downstream end of the variable twist carburetor 3 is connected to the intake manifold 2 of the engine 1, and the joint fitting 52
to tightly fix both. As a result, the complete unit is attached to the engine 1, and the variable intake pipe length device is easily completed.

In this embodiment, the arm shaft 10 and the drum shaft 13 are constructed separately and arranged in parallel, and the deceleration mechanism is constructed by the arm shaft gear 11 and the drum shaft gear 12 that are respectively attached to both. .

Therefore, compared to the case where the drum 14 is provided at the end of the arm shaft 10, the tram 14 can be accommodated within the width of the air cleaner case 6, and the drum 14 extends laterally beyond the width of the engine. Such a layout can be avoided, and the width of the air cleaner bottom plate 8 and the air cleaner case 6 can be made smaller. Furthermore, the degree of freedom in the arrangement of the drum 14 and drum shaft 13 can be relatively increased.

Furthermore, by employing a speed reduction mechanism using a gear train, the servo motor 17 itself is not required to have a very large speed reduction rate. Therefore, even when four variable intake pipes are interlocked at once by one servo motor 17 as in this embodiment, it is possible to obtain the necessary torque by sufficiently decelerating the speed in the deceleration mechanism, and the servo motor 17 This can compensate for the lack of deceleration. As a result, the capacity of the servo motor 17 can be reduced, making it possible to make it more compact. However, it is of course possible to directly drive the arm 18 using a drum driven by a servo motor without using a gear train as a drive system in the variable intake pipe length device.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, it is possible to exclude the carburetor from the complete intake pipe length variable device. In this case, the carburetor is attached to the intake manifold in advance, and the complete intake pipe length variable device is attached to the intake port of the carburetor. As a result, the complete intake pipe length variable device is indirectly attached to the intake manifold via the carburetor.

[Effects of the Invention] According to the present invention, all fixed intake pipes, variable intake pipes, drive system components, etc. can be attached simply by connecting the complete air cleaner case bottom plate itself to the intake manifold. Therefore, first, there is no need to incorporate the variable intake pipe length device into the engine, and it can simply be attached to the bottom plate of the air cleaner case, which simplifies the complete assembly. Furthermore, since the complete air cleaner case bottom plate can be assembled by simply connecting it to the engine's intake manifold, assembly of the intake pipe length variable device to the engine is simplified. Furthermore, since drive system parts such as a servo motor are not attached to separate parts such as the vehicle body frame, before attaching the air cleaner case bottom plate to the engine, connect the variable intake pipe etc. and drive system parts in advance. This adjustment becomes possible. Therefore, the work for connection and adjustment becomes easier.

[Brief explanation of drawings]

1 to 4 show examples. 1 is a sectional view of the main part, FIG. 2 is a view taken in the X direction of FIG. 1, FIG. 3 is a view taken in the Y direction of FIG. 1, and FIG. 4 is a front view of the main part. (Explanation of symbols) 1...Engine, 2...Intake manifold,
3...Variable twisted cylinder carburetor, 4...Fixed intake pipe, 5...
... Guide pipe, 6 ... Air cleaner case, 8 ...
Air cleaner case bottom plate, 10... Arm shaft, 11... Arm shaft gear, 12... Drum shaft, 13... Drum shaft gear, 14... Drum, 17... Servo motor, 18... ...Arm, 2
6...Slider. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Kiyomitsu Komatsu 4th Drawing - Procedural Amendment (Spontaneous) 1 Indication of the Case Patent Application No. 156793/1983 2 Name of the Invention Intake Pipe Length Variable Device 3 Relationship with the Amended Person Case Patent Applicant Address Tokyo 2-1-1 Minami Aoyama, Miyakominato-ku Name Honda Motor Co., Ltd. 171 Ta, 984-3456 FAX 985
-67606 Column 7 for detailed explanation of the invention in the specification subject to amendment Contents of amendment ``Delete'' from ``Difficult to use.'' Page 13, line 6: Correct ``Unusable J'' to ``Unusable J.''

Claims (1)

[Claims] It has a fixed intake pipe and a movable intake pipe that can communicate with a carburetor connected to the intake manifold of the engine and whose ends are enclosed in an air cleaner case, and the fixed intake pipe and the movable intake pipe are connected to each other according to the rotational speed of the engine. In the variable intake pipe length device that connects and separates the movable intake pipe, the fixed intake pipe, the movable intake pipe, and drive system parts of the movable intake pipe are attached to the air cleaner bottom plate fixed to the air cleaner case. Features a variable intake pipe length device.