JPS61277863A - Suction device in motorcycle and the like - Google Patents

Abstract

PURPOSE:To prevent control of suction to the one suction pipe thanks to inertia of a suction flow to the other suction pipe and to enable to perform effective suction even during a transient state, by a method wherein a partitioning member is located in an air cleaner. CONSTITUTION:During idle running and low and middle speed range running, a throttle valve 13 opens a suction passage 11, and air is introduced from a suction port 9 to a combustion chamber 8 by means of a suction pipe 6 and a suction passage 11 from an intake air inlet 6a after passage through a filter element 5 of an air cleaner 1. During high speed range running, with the throttle valve 13 fully opened or brought into an intermediate opening state, a butterfly valve 15 is opened, and this opens a negative pressure-operated throttle valve 14, and causes intake air to flow in a combustion chamber 8 through two suction systems. A partitioning member 20 prevents the inertia action of a suction flow in the suction pipe 6 from impeding suction of a suction pipe 7 during a transient state from low speed and middle speed running to high speed running.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intake system for a motorcycle or the like that takes air into a combustion chamber of an engine from a shared air cleaner through a plurality of independent intake pipes.

(Prior art) In the intake system of automobiles, especially motorcycles, etc., a single common air cleaner is generally used to simplify the configuration, and in order to optimize the intake performance for the engine cylinder. A plurality of independent intake systems are provided. In other words, the upstream ends of a plurality of independent intake pipes, that is, the intake intake ports, are connected to one shared air cleaner, and the downstream ends of these intake pipes are connected to a plurality of, for example, two, intake pipes provided in the engine cylinders. are connected to the respective intake ports. The reason why there are multiple intake systems is that when driving at low speeds, air is taken in from only one intake system to improve combustion performance and fuel efficiency by adding swirl, and when driving at high speeds, air is taken from both intake systems to improve intake air filling efficiency. This is to increase the output and improve the output.

Also, in the case of a multi-cylinder engine, one
Even in models with only individual intake ports, each intake pipe is installed independently in order to optimize intake performance for each cylinder, and the intake pipe at the upstream end is opened to a shared air cleaner. ing.

In this way, when multiple intake pipes are connected to one air cleaner, the intake ports of each intake pipe are necessarily adjacent to each other, but this reduces the inertia of the intake air flow to one intake pipe. This action tends to impede air intake to the other intake pipe. In other words, to explain the case of a single-cylinder engine having multiple intake systems, for example, during idling or low-speed load, air is taken from one intake pipe, then during high-speed operation, air is taken from the other pipe. If you also try to take in air from the intake pipe, the inertia of the previous intake pillar acts as a temporary restraint on the later intake, and
There was a problem that the rear intake system did not work effectively.

(Object of the Invention) The present invention has been made in view of the above conventional problems, and by providing a partition member in the air cleaner, the inertia of the intake air flow to one intake pipe causes the intake air to the other intake pipe. An object of the present invention is to provide an air intake device for a motorcycle or the like, which allows air to be effectively taken in even during a transient period without being inhibited.

(Structure of the Invention) The present invention provides an air intake system for a motorcycle or the like that includes a plurality of independent intake pipes each having an open air intake port adjacent to a shared air cleaner. A partition member is provided between the two intake pipes to alleviate the suppression of intake air into the other intake pipe due to the inertia of a single airflow into the one intake pipe.

With this configuration, even if a plurality of intake systems have adjacent intake ports, mutual interference will not occur due to intake inertia.

(Example) Hereinafter, the present invention will be explained with reference to drawings showing embodiments.

1 to 3 show an embodiment of the present invention. Reference numeral 1 denotes an F-cleaner, and the air cleaner 1 includes a case 2, a guide member 3 made of a box-shaped metal mesh, etc., and a binder presser attached to the case 2. 4, and a filter element 5 mounted between the binder presser 4 and the guide member 3.

Reference numeral 6.7 denotes independent intake pipes whose upstream ends open into the air cleaner 1 as intake ports 6a and 7a, and the upstream ends of the intake pipes 6 and 7 have flanges,
This flange portion is fastened to the case 2 of the air cleaner 1 together with the binder presser 4 using screws or the like.

Reference numeral 8 designates a combustion chamber of an engine cylinder, and the intake boats 9 and 10 of this combustion chamber 8 are provided with intake passages 11 and 12, respectively, and the intake pipes 6 and 7 are provided in these intake passages 11 and 12, respectively.
The downstream ends of are connected.

Further, one intake passage 11 is provided with a throttle valve 13 operated by a throttle cable, and the other intake passage 11 is provided with a throttle valve 13 operated by a throttle cable.
2 is provided with a throttle valve 14 operated under negative pressure, and further provided with a butterfly valve 15 on the downstream side of this throttle valve 14. That is, the intake pipe 6 and the intake passage 11 are operated in idle link operation and in low and low conditions.
The intake pipe 7 and the intake passage 12, together with the intake pipe 6 and the intake passage 11, serve as the intake system during operation in the high speed range. Exhaust passages 18.19 are connected to the exhaust boats 16.17 of the combustion chamber 8, respectively.

2o is a partition member which is a feature of the present invention, and this partition member 2
0 is fixed to the inner wall surface of the guide member 3 in a shape that divides the box-shaped space formed by the box-shaped guide member 3 in the air cleaner 1 into two parts corresponding to the air intake ports 6a and 7a. In this example.

The plate-shaped partition member 20 is fixed to the guide member 3 by welding or the like using cut and raised pieces 20a bent at right angles at both ends in the longitudinal direction.

The operation of the above configuration will be explained next.

During idle link operation and operation in the low and medium speed range, the throttle valve 13 operated by the throttle cable opens the intake passage 11 as shown in FIG. 1, and therefore the combustion air passes through the filter element 5 of the air cleaner 1 as shown by the arrow. The air is then introduced into the combustion chamber 8 from the intake boat 9 through the intake pipe 6 and the intake passage 11 through the intake port 6a. At this time, as shown in the figure, a swirl is applied to the intake air in the combustion chamber 8, thereby improving combustibility and fuel efficiency.

Next, during high-speed operation, as shown in FIG. 3, the throttle cable-operated throttle valve 13 is fully open or in an intermediate opening state, and the butterfly valve 15 is opened, so that the negative pressure-operated throttle valve 14 is opened. Air is taken in from two intake systems as shown by the arrows, increasing the filling efficiency of the intake air and improving the output.

In the present invention, as described above, since the partition member 20 is provided during the transition period from idling operation and operation in the low and medium speed range to operation in the high speed range, during idling operation and operation in the low and medium speed range, the partition member 20 is provided. The inertial action of the intake flow in one of the intake systems that is formed does not interfere with the intake air in the other intake system that is formed later during high-speed driving, and independent intake actions are performed effectively. become.

That is, if the partition member 20 were not present, the inertial action of the intake air flow formed by the intake air would transiently suppress the intake action of the intake system that attempts to take air later. However, in the present invention, the inertia of such an intake pillar can be alleviated, and each independent intake system can be effectively utilized.

Next, FIGS. 4 to 7 show other embodiments of the present invention, and none of them show various configuration examples of the partition member 20. In the embodiment shown in FIG. 4, one end of the partition member 20 provided in the same manner as in the above drawing is locked to a locking piece 21 provided at the upstream end connection portion of the intake pipes 6 and 7, and as shown in FIG. In the embodiment, a partition member 20a having an inverted V-shaped cross section is provided on the inner wall surface of the guide member 3 of the air cleaner 1.
In the embodiment shown in FIG. 6, a partition member 20b is integrally provided at the connecting portion of the intake pipe 6.7, and the top thereof is attached to the central inner wall surface of the guide member 3. In the embodiment shown in FIG. 7, the intake pipe 6
, 7 are formed to protrude into the box-shaped space of the guide member 3 in the shape of a mountain. Note that the intake pipes 6 and 7 are
It is made of flexible material such as rubber.

In the above description of the embodiment, a single cylinder is provided with a plurality of independent intake systems, but the present invention is not limited to this, and is similarly applicable to multi-cylinders each having individual intake systems. It is possible.

(Effects of the Invention) As described above, according to the present invention, a partition member is provided between adjacent intake ports in an air cleaner to alleviate the inertial effect of the intake pillars formed in each intake system. The inertia of the intake air flows does not adversely affect each other, the intake characteristics of each independent intake system can be effectively maintained, and intake performance can be reliably and easily improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a part of an intake system for a motorcycle or the like according to an embodiment of the present invention.
Fig. 2 is a plan view of the air cleaner section of the intake system with the filter element removed, and Fig. 3 corresponds to Fig. 1 during high-speed operation. Configuration explanatory diagram, Fig. 4, Fig. 5, Fig. 6,
FIG. 7 is a cross-sectional view showing the main parts of other embodiments of the same intake device. 1... Air cleaner, 6, 7... Intake pipe, 6a, 7
a...Intake intake, 20, 20a, 20b, 20c
...Partition member. Special 1 [Applicant: Yamaha Motor Co., Ltd. Agent: Patent Attorney: Etsushi Kotani, Patent Attorney
Long 1) Seido Patent Attorney Yasuo Itaya Figure 1 Figure 2

Claims (1)

[Claims] 1. In an intake system for a motorcycle, etc., which is equipped with a plurality of independent intake pipes each having an open intake port adjacent to a shared air cleaner, one intake pipe is connected between the adjacent intake ports in the air cleaner. 1. An intake device for a motorcycle or the like, characterized in that a partition member is provided to alleviate the suppression of intake air into the other intake pipe due to the inertia of the intake air flow into the other pipe.