JP2002250215A - Exhaust apparatus for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide new type exhaust apparatus for an engine, of which mechanism for promoting noise reduction effect and improving exhaust efficiency is a cartridge type with a variable adjustment function of remote control. SOLUTION: The exhaust apparatus is provided with an inner slide system 11. The inner slide system comprises: a slide pipe 16 in which a center partition 15 with a bypass pipe 14 is disposed at a center portion of the slide pipe to partition an inner portion into an upstream side and a downstream side so that they are disconnected with each other; an upstream opening portion 20 opening to a peripheral wall at a portion upstream of the bypass pipe 14, and a downstream opening portion 21 opening to the peripheral wall at a portion downstream of the bypass passage; and a shutter 19 for adjusting exhaust and opening/closing the downstream opening portion 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system for an engine in which a mechanism for promoting a silencing effect and improving exhaust efficiency is a cartridge type having a variable control function of a remote control.

[0002]

2. Description of the Related Art Conventional mufflers give priority to exhaust efficiency,
When pursuing engine power, there is only a means of lowering the volume with an additional thing to clear the regulation value of the exhaust volume, and conversely, it is not possible to obtain enough engine power to give priority to the silencing effect There was a problem.

[0003]

SUMMARY OF THE INVENTION A first object of the present invention is to solve the above-mentioned problems, and a second object of the present invention is to make an adjusting mechanism portion exposed to a high temperature replaceable as a cartridge type. A third object is to enable remote control from a cab.

[0004]

In order to achieve the first object, an exhaust system for an engine according to the present invention has a center partition 1 having a bypass pipe 14 at the center.
5, a slide pipe 16 whose inside is blocked on the upstream side and the downstream side, an upstream opening 20 opened at a location upstream of the bypass pipe 14 on the peripheral wall of the slide pipe 16, and a downstream opening opened at a downstream location 21 and
Exhaust adjustment shutter 19 for opening and closing the downstream opening 21
And an inner slide system 11 consisting of

In order to achieve the second object, an exhaust system for an engine according to a second aspect includes a silencer cap 10 and a silencer outer shell 12,
The inner slide system 11 can be detached from the silencer outer shell 12 by removing the silencer cap 10,

According to a third aspect of the present invention, there is provided an exhaust system for an engine, wherein an exhaust adjusting shutter is operated by an exhaust shutter opening wire and a closing spring. The operation knob of the wire 17 for opening and closing the exhaust shutter is provided in the cab.

[0007]

In other words, the adjusting mechanism, which is always exposed to a high temperature, is of a cartridge type, and when it deteriorates and no longer fulfills its original function, the function can be regained by replacing this part, reducing the burden on the user. It is also possible to reduce the engine characteristics and volume according to the driving place and driving conditions, and muffler setting in accordance with the tuning of the engine can be performed in the adjustment mechanism of the cartridge, the engine tuning is the basic setting of the muffler Even if it exceeds, the original setting can be obtained according to the engine tune by using a kit sold separately.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment shown in the figure is a straight silencer at the end of a straight pipe type having no silencer through which exhaust gas consisting of an upstream main pipe 2 and a downstream main vibe 3 connected by a pipe connecting band 1 is passed. 4 is a muffler 7 which is connected with a pipe connecting band 5 and a vehicle body mounting stay 6, and has a main silencer 4 in which a uniquely developed removable cartridge type mechanism 8 described later is incorporated.

The main silencer 4 has a silencer cap 10 and an inner slide system which are mounted on a vehicle silencer (main tyco and sub tyco) with a mechanism for silencing and improving exhaust efficiency. 11 and silencer outer shell 1
The inner slide system 11 can be detached from the silencer outer shell 12 by removing the silencer cap 10.

[0010] The inner slide system 11 is a slide pipe 1 whose inside is blocked back and forth by a center vertice 15 having a bypass pipe 14 in the center.
6, an exhaust adjustment shutter 19 which can be operated by an exhaust shutter opening wire 17 and a closing spring 18.
And a pair of upstream openings 20 at a location upstream of the bypass pipe 14 on the peripheral wall of the slide pipe 16, and a pair of downstream openings 21 at a location downstream thereof, respectively, The exhaust shutter opening wire 17 is adjusted by a knob (not shown) installed in the vehicle.

That is, in the above inner slide system, when the exhaust shutter opening wire 17 is pulled by operating a knob installed in the cab, the exhaust adjusting shutter 19 is moved to the downstream exhaust port 21.
And the gas discharged from the engine passes through the bypass in the pipe, and from the main silencer outlet 22,
It is released to the atmosphere (exhaust efficiency; minimum / silence effect; minimum state), and the knob 19 is also used for adjusting the exhaust.
Is adjusted to a position where the downstream exhaust port 21 is fully opened, more exhaust gas is released to the atmosphere (exhaust efficiency; maximum / muffling effect; minimum state) than when the exhaust adjustment shutter 19 is fully closed. That's what I did.

The flow and characteristics of the exhaust gas when the downstream opening is closed will be described in more detail with reference to FIG. When the knob installed in the cab is pulled, the exhaust adjustment shutter 19 is moved by the wire and the downstream exhaust port (b
Part) is fixed in the fully closed state. The gas discharged from the engine passes through the straight main pipe without stress and reaches the main silencer. The gas that has reached the main silencer is roughly divided into a gas that passes through a bypass pipe (part d) where the flow rate required for traveling is secured and a gas that tries to stay in the muffler when it hits a center vertice (part c). The gas separated by the partition flows out into the main silencer from the upstream opening (part a),
It is filled in the main silencer (part e). As described above, gas is generated in the main silencer to increase the torque in the low speed range. The exhaust volume is the minimum volume that is discharged by the minimum flow rate secured by the bypass pipe, so that the exhaust volume becomes the volume that satisfies the security standards while being a straight pipe muffler.

The flow and characteristics of the exhaust gas when the downstream opening is opened will be described with reference to FIG. The exhaust adjustment shutter 19 is fixed to a position where the downstream opening (portion b) is fully opened by a knob in the room. The exhaust gas that has passed without stress through the main pipe, which has the highest priority on efficiency, is led into the main silencer. The gas that has reached the main silencer passes through the bypass pipe (portion d) and the center partition (portion c), and is divided into those flowing out of the slide pipe into the silencer through the upstream opening (portion a). Gas flowing out into the silencer from the upstream opening (portion a) is accumulated in the main silencer (portion e). By creating a pool of exhaust in this area, one of the weaknesses of the straight pipe muffler is "prevention of torque loss due to excessive slippage". The gas accumulated in the bypass pipe passage (part d)
The gas that has passed through the bypass pipe is pulled out from the downstream opening (portion b) and discharged from the main silencer outlet 22. As described above, in the main silencer (portion e), the inflow amount and the outflow amount of the gas are balanced, and optimal exhaust is performed. By adjusting the opening area of the downstream side exhaust port, it is possible to arbitrarily control the exhaust efficiency optimal for the traveling place and the traveling situation. When this downstream exhaust port is fully opened, a state of a main pipe that is linearly grooved and a main silencer with good slippage is realized, increasing the flow rate of exhaust gas and increasing power at high rotation speeds and powerful exhaust. Turn up the volume.

[0014]

The present invention is as described above, and has the following effects. ◎ By adopting the inner slide system, the internal structure can reduce the torque of the conventional straight pipe muffler and clear the regulation values at the time of vehicle inspection. ◎ By changing the opening area of the downstream opening 21, the torque generating rotation range and the sound volume can be arbitrarily changed (settings according to the traveling place are possible). The opening area of the downstream opening can be determined by sliding a pipe provided outside the downstream opening from the cab. ◎ The cartridge-type internal structure makes it possible to obtain an optional set-up kit according to the engine tune and perform original tuning. It is no longer necessary to buy a new one.

The above-described mechanism for improving the noise reduction effect and the exhaust efficiency in the vehicle noise reduction device can be applied not only to the main silencer but also to a sub-silencer provided on a muffler through which the exhaust passes. is there. Further, instead of a slide operable mechanism using the exhaust shutter opening wire 17 and the closing spring 18, an automatic or manual reciprocating device such as a motor driven rack device can be used.

[Brief description of the drawings]

FIG. 1 is an exploded side view showing the whole.

FIG. 2 is a sectional view showing a main part in a closed state.

FIG. 3 is a sectional view showing a main part in an open state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Band for connecting pipes 2 Main pipe 3 Main vibrating 4 Main silencer 5 Band for connecting pipes 6 Body mounting stay 7 Muffler 8 Cartridge type mechanism 10 Silencer cap 11 Inner slide system 12 Silencer outer shell part 14 Bypass pipe 15 Center vent 16 Slide pipe 17 Exhaust shutter opening wire 18 Exhaust shutter closing spring 19 Exhaust adjustment shutter 20 Upstream opening 21 Downstream opening 22 Main silencer outlet

Claims (4)

[Claims] 1. A slide pipe 16 whose inside is shut off on the upstream and downstream sides by a center bartation 15 having a bypass pipe 14 at a central portion, and a slide pipe 16 which is opened at a peripheral wall of the slide pipe 16 at a location upstream of the bypass pipe 14. An internal slide system 11 including an upstream opening 20 and a downstream opening 21 opened at a downstream location, and an exhaust adjustment shutter 19 for opening and closing the downstream opening 21. Exhaust system. 2. An exhaust system for an engine according to claim 1, comprising a silencer cap, a silencer outer shell, and an inner slide system.
An exhaust device for an engine, wherein the exhaust device is detachable from the silencer outer shell portion 12 by removing the silencer cap 10. 3. An exhaust system for an engine according to claim 1, wherein the exhaust adjusting shutter comprises an exhaust shutter opening wire and a closing spring.
An exhaust device for an engine, wherein the exhaust device is operable with the engine. 4. The exhaust system for an engine according to claim 3, wherein an operation knob of the wire for opening the exhaust shutter 17 is provided in a cab.