JPH07117495A - Overhead-type muffler exhaust structure of industrial vehicle - Google Patents

Abstract

PURPOSE:To obtain an overhead-type exhaust structure wherein exhaust gas is not allowed to flow toward a driver when a vehicle goes forward or backward. CONSTITUTION:A muffler is connected to an exhaust pipe 12. The exhaust pipe 12 is composed of a first exhaust pipe 13 arranged in a rear side strut 7 and a second exhaust pipe 14 arranged in a beam member 8. The first exhaust pipe 13 and the second exhaust pipe 14 are connected to each other through a communication box body 15. A front end exhaust port is formed by a front end opening part 14b of the second exhaust pipe 14. A rear exhaust port 19 is formed by a rear end opening part of a rear exhaust pipe 18 communicated with the inside of the communication box body 15. A block plate 20 is formed in the communication box body 15 so as to be turned. A rotary shaft 21 of the block plate is connected to a reciprocating rod through a link member, and the reciprocating rod is connected to a solenoid. The solenoid is connected to a detecting sensor for detecting the forward/backward travel of the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial vehicle such as a forklift truck, and more particularly to an overhead muffler exhaust structure for an industrial vehicle that discharges exhaust gas from an engine to the outside above the vehicle.

[0002]

2. Description of the Related Art In general industrial vehicles such as forklifts, exhaust gas is discharged from the rear part of the vehicle body, but this causes the exhaust gas to impinge on an object placed on the ground at the rear part of the vehicle body. In order to avoid this, conventionally, an overhead muffler exhaust structure as described in, for example, Japanese Utility Model Laid-Open No. 58-142133 is adopted.

The exhaust pipe is erected from the upper surface of the rear part of the vehicle body or inside the rear support of the head guard, and the lower end opening of the exhaust pipe communicates with a muffler mounted on the vehicle body. The upper end opening of the exhaust pipe is configured to open obliquely rearward of the vehicle, and the exhaust gas is guided to the upper side of the vehicle by the exhaust pipe and is discharged rearward of the vehicle.

[0004]

With the overhead muffler exhaust structure having the above-described structure, the exhaust gas is always discharged toward the rear of the vehicle. Therefore, when the vehicle is moving forward, the exhaust gas discharged is discharged toward the rear. Flowing. However, industrial vehicles such as forklift trucks often perform backward movement work, and when the vehicle is moving backward, it is common for the driver to drive with his / her face facing the rear of the vehicle. In such a case, the exhaust gas discharged from the upper portion of the exhaust pipe toward the rear of the vehicle is blown back and the exhaust gas may flow toward the driver, which may give the driver discomfort.

Even when the vehicle is moving forward, the exhaust gas discharged may flow toward the driver depending on the direction of the wind. The present invention has been made in view of the above problems, and an object of the present invention is to provide an overhead exhaust structure in which exhaust gas does not flow toward a driver during both forward and reverse travel of a vehicle.

[0006]

In order to achieve the above object, in the overhead muffler exhaust structure of the present invention, in an industrial vehicle in which the driver's seat is protected by a head guard, one of the rear support columns of the head guard is provided. , And in the beam member installed between the upper end of the rear strut and the upper end of the front strut positioned in front of it, and arranged along the axes of the rear strut and beam member, and the lower end. An exhaust pipe that communicates an opening with a muffler mounted on the vehicle body, and a rear exhaust port that opens the exhaust pipe to the outside at the upper end position of the rear column,
A front exhaust port that opens the exhaust pipe to the outside at a position substantially in front of the beam member in the vehicle front-rear direction, and exhaust gas to both the rear exhaust port and the front exhaust port that is provided in the middle of the exhaust pipe. An opening / closing means for opening / closing the distribution exclusively is provided.

At this time, the detecting means for detecting or estimating the forward / backward movement of the vehicle, the opening / closing means, and the detecting means are connected to the opening / closing means to open the rear discharge port when the vehicle is moving forward. It is advisable to provide interlocking means for driving the front discharge port to the closed state and the rear discharge port to the closed state when the vehicle is moving backward.

[0008]

The function of the exhaust gas blown from the exhaust pipe changes depending on the traveling direction of the vehicle and the direction of the surrounding wind.
In view of this, according to the flowing direction of the exhaust gas discharged from the exhaust pipe, either the rear exhaust port or the front exhaust port is selected by the opening / closing means, and the exhaust gas exhaust position is set to the driver's seat. On the front side or the back side of.

For example, if the exhaust gas flows to the rear of the vehicle, the opening / closing means closes the front exhaust port to discharge the exhaust gas from the rear exhaust port, and the exhaust gas flows to the front of the vehicle. The opening / closing means closes the rear exhaust port to exhaust the exhaust gas from the front exhaust port. This prevents the exhaust gas blown from the exhaust pipe from flowing toward the driver's seat.

At this time, generally, when the vehicle moves forward, the exhaust gas flows rearward of the vehicle, and when the vehicle moves backward, the exhaust gas flows forward of the vehicle. Therefore, the detecting means and the interlocking means should be provided. The exhaust port of the exhaust gas is automatically switched in conjunction with the change lever that operates the vehicle's forward and reverse movements, and the exhaust gas is automatically discharged to the rear of the vehicle when the vehicle is moving forward and to the front of the vehicle when the vehicle is moving backward. Will be discharged to the
Exhaust of exhaust gas toward the driver is automatically avoided.

Since the exhaust pipe is arranged in the column or the beam member of the head guard, the appearance is not deteriorated, and
There is no need to provide a separate member to support the exhaust pipe.

[0012]

Embodiments of the invention will be described with reference to the drawings. First, the configuration will be described. As shown in FIG. 4, the mast device 2 is mounted on the front side of the vehicle body 1, and the driver's seat 4 is installed on the top panel 3 attached to the upper portion of the vehicle body 1. A head guard 5 is provided so as to cover the driver's seat 4.

The head guard 5 includes four columns 6 and 7,
A beam member 8 that is installed between the upper ends of the columns 6 and 7, and a top plate 9 that is attached between the beam members 8 to protect the driver's overhead.
It consists of and. The four columns 6 and 7 are two front columns 6 standing upright from the vehicle body 1 in front of the driver's seat 4.
And two rear columns 7 standing upright from the vehicle body 1 behind the driver's seat 4.

A muffler 10 to which engine exhaust gas is sent is disposed in the rear portion of the vehicle body 1.
The exhaust port of the muffler 10 is connected to the lower end of the exhaust pipe 12 via a connecting pipe 11. As shown in FIG. 1, the exhaust pipe 12 includes a first exhaust pipe 13 disposed along the rear strut 7 in the rear strut 7 on the right side in the vehicle width direction, and an upper end portion of the rear strut 7. And a second exhaust pipe 14 disposed along the beam member 8 in the beam member 8 that is installed between the upper end of the front strut 6 on the right side in the vehicle width direction. The upper end opening 13a of the first exhaust pipe 13 and the rear end opening 14a of the second exhaust pipe 14 are both connected by a communication box body 15 arranged in the upper end of the rear support 7, and both opening parts are connected. Thirteen
a and 14 a project into the communication box body 15.

A heat insulating member 16 is provided between the outer peripheral surface of the first exhaust pipe 13 and the inner peripheral surface of the rear strut 7, and between the outer peripheral surface of the second exhaust pipe 14 and the inner peripheral surface of the beam member 8, respectively. Is provided to prevent the pillar 7 and the like from being heated by the exhaust gas flowing in the exhaust pipe 12. Further, as shown in FIG. 3, the front end opening 14b of the second exhaust pipe 14 is bent laterally and protrudes outward in the vehicle width direction through an opening hole formed in the beam member 8 to the front side. The discharge port 17 is formed.

An opening hole is formed in the rear surface of the upper end of the rear support 7, and a rear discharge pipe 18 communicating with the front end opening side in the communication box body 15 so as to penetrate the opening.
Project rearward, and the rear end opening of the rear discharge pipe 18 forms a rear discharge port 19. Further, an opening / closing means is provided in the communication box body 15. The opening / closing means includes the end face of the rear end opening 14a of the second exhaust pipe 14 and the rear exhaust pipe 18
A flat plate-shaped closing plate 20 that can abut against the end surface of the front end opening 18a, and a rotary shaft 21 that is supported by the communication box body 15 with its axis horizontal and that supports the upper part of the closing plate 20 so that it can turn.
It consists of and.

At this time, when the closing plate 20 turns rearward, it comes into contact with the end face of the front end opening 18a of the rear discharge pipe 18 to close the rear discharge port 19 side, and when the closing plate 20 turns forward, the second The positions and the orientations of the opening end faces are set so as to contact the end face of the rear end opening 14a of the exhaust pipe 14 and close the front discharge port 17 side. As a result, the closing plate 20 moves the rear end opening 14 of the second exhaust pipe 14.
a and the front end opening 18a of the rear discharge pipe 18, that is, the front discharge port 17 and the rear discharge port can be opened and closed exclusively.

Further, the rotary shaft 21 projects laterally from the rear support 7, and as shown in FIG.
The upper end of the link member 22 is fixed to the front end of the link member 1. One end of the advancing / retreating rod 23 is connected to the lower end of the link member 22, the advancing / retreating rod 23 extends forward along the beam member 8, and the rear part thereof is connected to the solenoid 24.
The solenoid 24 is adapted to move back and forth in the axial direction. The solenoid 24 is connected via a harness 25 to a detection sensor that constitutes a detection means for detecting the forward / backward movement of the vehicle, and the detection sensor, the solenoid 24, and the advancing / retreating rod 23 constitute interlocking means.

The detection sensor supplies an ON signal to the solenoid 24 when detecting the backward movement of the vehicle, the solenoid 24 extends the forward / backward rod 23 to the rear of the vehicle, and supplies an OFF signal to the solenoid 24 when detecting the forward movement of the vehicle. 24 is set so as to retract the advancing / retreating rod 23. The detection sensor is interlocked with a change lever 28 such as a torque converter lever 26 or a manual lever 27, which is provided in the vehicle body 1 and operates the vehicle to move forward or backward.

In the industrial vehicle having the exhaust structure of the overhead muffler 10 having the above-described structure, the exhaust gas discharged from the engine is sent to the first exhaust pipe 13 via the muffler 10. The exhaust gas sent to the first exhaust pipe 13 flows upward in the first exhaust pipe 13 along the first exhaust pipe 13 and is sent into the communication box body 15. At this time, when the vehicle moves forward, since the change lever 28 is operated to the forward position, the detection sensor supplies an OFF signal to the solenoid 24, and the forward / backward rod 23 moves backward. As a result, the link member 22 pivots forward and the rotary shaft 21
The closing plate 20 also swivels forward through the above and abuts on the end face of the rear end opening 14a of the second exhaust pipe 14 to close it.

Therefore, when the vehicle is traveling forward, the exhaust gas sent into the communication box body 15 is exhausted toward the rear of the vehicle through the rear exhaust pipe 18 and is directed to the second exhaust pipe 14. Does not flow. As a result, the exhaust gas is prevented from being discharged from the rear position of the driver substantially rearward and flowing toward the driver side.

When the vehicle is moving in the reverse direction, the change lever 28 is operated to the reverse position, so that an ON signal is supplied from the detection sensor to the solenoid 24 to extend the advancing / retreating rod 23. As a result, the link member 22
Turns to the rear side of the vehicle, and the blocking plate 20 passes through the rotary shaft 21.
Also swivels rearward and contacts the end face of the front end opening 18a of the rear discharge pipe 18 to close the rear discharge port.

Therefore, when the vehicle is moving backward, the exhaust gas sent into the communication box body 15 is sent only into the second exhaust pipe 14, and the front end opening of the second exhaust pipe 14 is That is, it is discharged from the front discharge port 17 to the outside of the vehicle. As a result, the exhaust gas is discharged from the front position of the driver toward the side and flows toward the front of the vehicle, so that the exhaust gas is prevented from flowing to the driver side.

Next, a second embodiment will be described. The basic configuration of the second embodiment is the same as that of the first embodiment, except for the communication box body 15 also serving as the valve box and the opening / closing means. Explaining the configuration of the different portion, as shown in FIG. 5, a T-shaped pipe joint having a rectangular cross section is used as the communication box body 15, and the first exhaust pipe 1 is connected to the T-shaped communication box body 15.
3, open ends 1 of the second exhaust pipe 14 and the rear exhaust pipe 18
3a, 14a and 18a are respectively connected.

The second exhaust pipe 1 in the communication box body 15
4, and a branch portion 15a, 1 connecting the rear discharge pipe 18
In 5b, a first closing plate 31 and a second closing plate 32, respectively.
Is provided. Each of the closing plates 31 and 32 is composed of a rectangular plate member whose vertical direction is slightly longer than the vertical sectional shape of the branch portions 15a and 15b. The first
The central portions in the vertical direction of the closing plate 31 and the second closing plate 32 are
Each of the branch portions 15a and 15b is rotatably supported by rotary shafts 33 and 34 that horizontally and radially pass through the branch portions 15a and 15b. Has become.

At the ends of the two rotary shafts 33, 34,
As shown in FIG. 6, the upper ends of the link members 35 and 36 are fixed, and the lower ends of the pair of link members 35 and 36 are connected by a second link member 37 having a horizontal axis to form a parallel link. It constitutes the mechanism. Here, one of the two closing plates 31 and 32 is the branching portion 15
The other closing plates are set in different phases so that they are in a horizontal state when they are in contact with the a and 15b, and the second link member 37 moves to the vehicle rear side, whereby the second closing plate 32 is moved.
Comes into contact with the inner peripheral surface of the branch portion 15b, and the second link member 37 moves toward the vehicle front side, whereby the first closing plate 31
Is in contact with the inner peripheral surface of the branched portion 15a.

The rear end of the advancing / retreating rod 23 is connected to the second link member 37, and the second link member 37 moves in the axial direction according to the advancing / retreating of the advancing / retreating rod 23. In the piping structure of the second embodiment, like the first embodiment, when the vehicle moves forward, the change lever 28 is operated to the forward position, so that the OFF signal is supplied from the detection sensor to the solenoid 24. Then, the advancing / retreating rod 23 retracts, the two link members 35, 36 pivot forward through the second link member 37, and the two closing plates 31, 32 rearward through the rotary shafts 33, 34. Turn in the counterclockwise direction in FIG. Thereby, the branch portion 15a on the second exhaust pipe 14 side
The first closing plate 31 closes and the second closing plate 32 becomes horizontal so that the communication box body 15 and the rear discharge pipe 18 communicate with each other.

Therefore, when the vehicle is traveling forward, the exhaust gas sent into the communication box body 15 is exhausted toward the rear of the vehicle through the rear exhaust pipe 18 and is directed to the second exhaust pipe 14. Does not flow. As a result, the exhaust gas is prevented from being discharged from the rear position of the driver substantially rearward and flowing toward the driver side.

When the vehicle is traveling in the reverse direction, the change lever 28 is operated to the reverse position, so that an ON signal is supplied from the detection sensor to the solenoid 24, the advancing / retreating rod 23 extends, and the second link member is extended. The two link members 35 and 36 pivot to the rear side via the rotary shaft 33,
The two closing plates 31 and 32 also swivel forward via 34. Thereby, the branch portion 15b on the rear discharge pipe 18 side
The second closing plate 32 closes and the first closing plate 31 becomes horizontal so that the communication box body 15 and the second exhaust pipe 14 communicate with each other.

For this reason, when the vehicle is performing reverse work, the exhaust gas sent into the communication box body 15 is sent only into the second exhaust pipe 14, and the front end opening of the second exhaust pipe 14 is opened. Is discharged outside the vehicle. As a result, the exhaust gas is discharged from the front position of the driver in a substantially lateral direction,
It is prevented from flowing to the driver side.

The opening / closing means in both embodiments is an example, and for example, as shown in FIG. 7, a closing plate 32 for swinging the rear discharge pipe 18 so as to be openable / closable is provided in the communication box body 15 and the second exhaust gas is also provided. A blocking plate 31 that swivels the second exhaust pipe 14 so as to be opened and closed is provided in the middle of the pipe 14, and both blocking plates 31 and 3 are provided.
The two may be set to be driven by separate solenoids 24.

The point is that the front outlet 17 and the rear outlet 19 may be opened and closed exclusively. Further, in the above embodiment,
Although the advancing / retreating rod 23 is advanced / retreated using the solenoid 24, the interlocking means may be configured by a mechanical mechanism such as connecting the advancing / retreating rod 23 and the change lever 28 with a push-pull cable or the like. Further, in the above-mentioned embodiment, the interlocking means is provided to change the exhaust gas exhaust port according to the forward and reverse movements of the vehicle. It may be possible to manually convert regardless.

In the above embodiment, the forward / backward movement of the vehicle is estimated by interlocking the detection sensor with the change lever. However, the forward / backward movement of the vehicle is directly set by setting the detection sensor on the wheel or the like. You may make it detect.

[0034]

As described above, in the overhead muffler exhaust structure for an industrial vehicle according to the present invention, the exhaust gas emitted from the engine is discharged from the vehicle to the outside by a driver sitting in the driver's seat. It is possible to select either the front side or the rear side of the vehicle, and it is possible to prevent the discharged exhaust gas from flowing toward the driver.

At this time, by providing the interlocking means, the exhaust position of the exhaust gas outside the vehicle is automatically switched so as not to flow to the driver side.
The driver does not need to be aware of the exhaust gas discharge position.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an exhaust structure of an embodiment according to the present invention.

FIG. 2 is a configuration diagram showing an interlocking device of an embodiment according to the present invention.

FIG. 3 is a diagram showing an exhaust port for exhaust gas according to an embodiment of the present invention.

FIG. 4 is a side view of an industrial vehicle according to an embodiment of the present invention.

FIG. 5 is a side sectional view showing an opening / closing means of a second embodiment according to the present invention.

FIG. 6 is a diagram showing a link mechanism of an opening / closing means of a second embodiment according to the present invention.

FIG. 7 is a side view showing an opening / closing means of a third embodiment according to the present invention.

[Explanation of symbols]

 1 Vehicle Body 4 Driver's Seat 5 Top Guard 6 Front Strut 7 Rear Strut 8 Beam Member 12 Exhaust Pipe 13 First Exhaust Pipe 14 Second Exhaust Pipe 17 Front Discharge Port 19 Rear Discharge Port 20 Closure Plate 21 Rotating Shaft 22 Link Member 23 Advance rod 24 solenoid

Claims (2)

[Claims] 1. In an industrial vehicle in which a driver's seat is protected by a head guard, the inside of one rear strut of the head guard, and between the upper end of the rear strut and the upper end of a front strut located in front of it. An exhaust pipe that is disposed along the axis of the rear strut and the beam member in the beam member that is erected, and that communicates the lower end opening with a muffler mounted on the vehicle body; and the rear strut. A rear discharge port that opens the exhaust pipe to the outside at the upper end position of the, and a front discharge port that opens the exhaust pipe to the outside at a substantially front position of the beam member in the vehicle front-rear direction,
An open / close means for an industrial vehicle, which is provided in the middle of the exhaust pipe, and has an opening / closing means for exclusively opening / closing the flow of exhaust gas to both the rear exhaust port and the front exhaust port. Muffler exhaust structure. 2. A detection means for detecting or estimating the forward movement / reverse movement of the vehicle, and the opening / closing means and the detection means,
Interlocking means for driving the opening / closing means to open the rear discharge port and close the front discharge port when the vehicle moves forward, and to close the rear discharge port and open the front discharge port when the vehicle moves backward. The overhead muffler exhaust structure for an industrial vehicle according to claim 1, further comprising: