JPH0769081A - Vertical type exhaust pipe device for cab-over type truck - Google Patents

Abstract

PURPOSE:To provide an exhaust pipe device whose structure is simple and lightweight and by which manufacturing cost can be reduced and a clearance between a cab and a cargo box can be reduced and measurement capacity can be increased in a cab-over type truck having a vertical type exhaust pipe. CONSTITUTION:An exhaust pipe 22 of an engine is formed of an upstream exhaust pipe 22a fixed to the under carriage frame 12 side and a downstream exhaust pipe fixed to a rear wall of a cab by extending in the vertical direction, and the upstream exhaust pipe and the downstream exhaust pipe 22b are connected to each other in an unfixed condition in an ejector part. A branch exhaust pipe 58 is arranged in the upstream exhaust pipe, and at tilt up time of the cab, the whole quantity of exhaust gas of the engine is diffused to outside air through the branch exhaust pipe from the middle of the upstream exhaust pipe by a valve device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical exhaust pipe device for a cab-over type truck.

[0002]

2. Description of the Related Art In a conventional cab-over type truck (including, of course, a tractor), exhaust gas of an engine arranged below a cab is discharged from a downstream opening end of an exhaust pipe arranged below a chassis frame to a ground surface. It is released to the outside at a near low position. For this reason, there is a problem that the influence of exhaust gas on pedestrians and plants existing near the ground surface becomes relatively large.

The above problem is effectively improved by arranging the exhaust pipe of the engine extending in the vertical direction, discharging the exhaust gas to the outside at a position sufficiently higher than the chassis frame, and spreading and diluting it like a chimney. can do.

A typical construction of a conventional cab-over type truck having the above vertical exhaust pipe will be described with reference to the schematic side view of FIG. Reference numeral 10 in the figure generally indicates a cab-over type truck, which is a ladder type chassis frame 12 extending in the vehicle front-rear direction, and the chassis frame 12
It has a cab 14 mounted on the front end of the. An engine 16 is arranged below the cab 14, and a luggage box 18 is mounted behind the cab.

The exhaust gas of the engine 16 is discharged to the outside air through an exhaust pipe 22 having one end connected to the exhaust manifold 20 and the other end opened at a position higher than the roof of the cab 14. The exhaust pipe 22 first extends rearward from the exhaust manifold 20 of the engine toward the muffler 24 disposed below the chassis frame 12, and then bends approximately 180 degrees from the outlet side of the muffler 24 to the front. It extends, bends upward, and extends upward.

The upright portion 2 extending above the exhaust pipe 22.
6 is disposed between the cab 14 and the luggage box 18, and its lower end is supported by a plurality of clamp devices 30 on a support member 28 fixed to the chassis frame 12. In addition,
In the figure, reference numeral 32 is a front wheel, and 34 is a muffler mounting member for suspending the muffler 24 below the chassis frame 12.

Although the supporting member 28 is schematically shown as a simple flat plate member in the figure for simplification, it is subjected to severe shaking and vibration in the front-rear direction, the left-right direction and the up-down direction which occur during traveling of the truck. In order to endure, it is necessary to make the tower-like structure sufficiently strong in practice, so that the manufacturing cost is high, the weight is large, and the space S in the vehicle front-rear direction between the cab 14 and the luggage box 18 is sufficient. Must be set large. The increase of the space S is not preferable because it means that the dimension of the packing box 18 in the front-rear direction is reduced with respect to the permissible total length of the truck, in other words, the effective carrying capacity is decreased, and the space S is made as small as possible. Is desirable.

[0008]

SUMMARY OF THE INVENTION The present invention overcomes the various drawbacks of the conventional vertical exhaust pipe apparatus described above, and has a simple structure, a light weight, a low manufacturing cost, and the above-mentioned structure between the cab and the cargo box. An object of the present invention is to provide an exhaust pipe device that can sufficiently reduce the space.

[0009]

The present invention was made in view of the above circumstances, and has one end connected to an exhaust manifold of an engine arranged below the cab and the other end bent upward to form a rear wall of the cab. And an upstream exhaust pipe supported by a chassis frame adjacent to the vehicle chassis, and vertically mounted on a rear wall of the cab, and a lower end opening of the upstream exhaust pipe sucks outside air into an upward opening end of the other end of the upstream exhaust pipe. A downstream exhaust pipe which is fitted with a gap and whose upper end is open to the outside at a position higher than the chassis frame, and one end is connected to the upstream side of the upward bend of the upstream exhaust pipe and the other end is the chassis. It is provided near the connection between the branch exhaust pipe that is open to the outside at a position lower than the frame and the upstream exhaust pipe and the branch exhaust pipe, and normally, substantially all of the exhaust gas of the engine passes through the upstream exhaust pipe. Downstream discharge A cabover characterized by comprising a valve device for circulating substantially the entire amount of exhaust gas of the engine from the middle of the upstream side exhaust pipe to the branch exhaust pipe when the cab is tilted up. A vertical exhaust pipe device for a die truck is proposed.

[0010]

According to the present invention, the exhaust pipe for discharging the exhaust gas of the engine to the outside air and the upstream exhaust pipe attached to the chassis frame side are provided on the rear wall of the cab which extends vertically. Since it is configured with the attached downstream side exhaust pipe, it is not necessary to provide an independent supporting structure such as the above-mentioned conventional supporting member 28, and the weight is reduced, the manufacturing cost is reduced, and the cab and the luggage box are combined. A space reduction between can be achieved.

Further, since the upper end of the upstream side exhaust pipe and the lower end of the upstream side exhaust pipe are non-fixedly connected to each other with a gap for sucking the outside air, the downstream side exhaust gas is inspected during inspection and maintenance of the engine and the like. The pipe can be tilted up integrally with the cab, and when the cab is in the normal position (normal position where the cab is not tilted up), the ejector effect is generated by the operation of the engine, and the ejector effect is generated from the outside air intake gap to the downstream side. Outside air is sucked into the exhaust pipe, the exhaust gas is positively diluted, and the temperature of the exhaust gas is reduced.

Further, since the branch exhaust pipe and the valve device are provided in the upstream side exhaust pipe, when the cab is tilted up, substantially all of the exhaust gas of the engine is guided to the branch exhaust pipe by the valve device when the cab is tilted up. By releasing the gas, it is possible to effectively prevent a worker who performs inspection and maintenance of the engine from being exposed to the hot exhaust gas.

[0013]

Embodiments of the present invention will be specifically described below with reference to FIGS. (It should be noted that substantially the same members or portions as those of the conventional device described with reference to FIG. 5 are denoted by the same reference numerals, and redundant description will be omitted.) According to the present invention, exhaust gas of the engine 16 The exhaust pipe 22 that diffuses
It is composed of an upstream side exhaust pipe 22a and a downstream side exhaust pipe 22b.

The upstream side exhaust pipe 22a is connected to the exhaust manifold 20 of the engine 16 at one end thereof, extends first rearward, and is disposed under the chassis frame 12 under the muffler 24.
It is connected to the. Next, the exhaust pipe 22a is connected to the muffler 24.
Approximately 9 degrees from the exit of the
It bends upward by 0 degrees and extends upward. The upward bending portion 22c has an open end 36 located slightly above the upper surface of the chassis frame 12. The upward bent portion 22c is fixed to the chassis frame by a support bracket 40 fixed to the chassis frame 12 adjacent to the rear wall 38 of the cab 14. The open end 36 is shown in FIG.
As shown in FIG. 3, it is preferably formed in a tapered nozzle shape.

On the other hand, the downstream side exhaust pipe 22b extends in the vertical direction substantially in line with the upward bent portion 22c, and a plurality of support brackets 42 support the cab rear wall 38.
It is fixed to. As best shown in the enlarged sectional view of FIG. 2, the support bracket 42 has a bracket body having one end fixed to the cab rear wall 38 by a bolt 44 and a semicircular grip portion 46 at the other end. 48 and a cap member 50 having a semicircular shape that cooperates with the grip portion 46 to clamp the downstream exhaust pipe 22b.
As illustrated, a heat insulating member 52 made of a heat insulating material such as glass wool is interposed between the grip portion 46 and the cap member 50 and the downstream side exhaust pipe 22b, and the exhaust pipe 22b is connected to the cab rear wall 38. It is preferred to reduce the heat transfer of

The lower end opening 5 of the downstream exhaust pipe 22b
4 is externally fitted to the open end 36 of the upward bent portion 22c with an outside air suction gap, and the upper end opening 56 is the roof 14 'of the cab 14 and the roof or the upper edge 1 of the luggage box 18.
It is arranged at a position higher than 8'and directed rearward (or laterally or rearwardly).

As shown in the enlarged side view of the main part of FIG. 3 and the enlarged sectional view of the main part of FIG. 4, the upstream exhaust pipe 2 is shown.
A branch exhaust pipe 58 is provided at an intermediate portion between the outlet of the muffler 24 of 2a and the upward bent portion 22c.
Has an opening 60 below the chassis frame 12 and directed rearward of the vehicle body.

Inside the upstream side exhaust pipe 22a on the upstream side of the branch exhaust pipe 58, the first valve 6 consisting of a butterfly valve.
2 is provided, and a second valve 64, which is also a butterfly valve, is provided at the inlet end of the branch exhaust pipe 58. A handle 68 for rotating the valve shaft 66 is fixed to one end of the valve shaft 66 of the first valve 62, and a sprocket wheel 70 is fixed to the other end of the valve shaft 66. A sprocket wheel 74 that forms a pair with and cooperates with the sprocket wheel 70 is fixed to one end of a valve shaft 72 of the second valve 64, and a chain 76 is wound around both sprocket wheels 70 and 74. Further, the sprockets 70 and 74, and the chain 76 are housed in a chain case 78 as shown in particular in FIG. 4, and are protected from external pollution such as flying stones and muddy water.

During normal times when the cab 14 is not tilted up around a tilt shaft (not shown) at the lower front end of the cab 14 except during inspection and maintenance of the engine 16, etc., the cab 14 is fixed to the valve shaft 66 of the first valve. The handle 68 is rotated clockwise by approximately 90 degrees from the position shown in FIG. 3, and the first valve 62 is held in a substantially horizontal fully opened position. By the rotation of the valve shaft 66 of the first valve, the second valve 64 is rotated by approximately 90 degrees in the same direction via the sprocket wheels 70 and 74 and the chain 76, and the inlet of the branch exhaust pipe 58 is closed. .

Therefore, in this normal state, the engine 16
Substantially all of the exhaust gas is discharged to the atmosphere from a position higher than the roof 14 'of the cab 14 through the upstream side exhaust pipe 22a and the downstream side exhaust pipe 22b. At this time, since the lower end opening 54 of the downstream side exhaust pipe 22b is externally fitted to the opening end 36 of the upward bent portion 22c of the upstream side exhaust pipe 22a with an outside air suction gap, the ejector effect is produced by the exhaust gas flow. When the exhaust gas is generated, the outside air is mixed with the exhaust gas, diluted, and emitted from the upper end opening end 56 of the downstream side exhaust pipe 22b, and further diluted with the surrounding outside air. Since the exhaust gas is sufficiently diluted as described above and is emitted at a position sufficiently high above the ground surface, the adverse effects of the exhaust gas on pedestrians and animals and plants existing near the ground surface are effectively mitigated. Further, since the temperature of the exhaust gas flowing in the downstream side exhaust pipe 22b becomes sufficiently low due to the mixing with the air sucked by the ejector effect, the heat transfer to the cab 14 can be greatly reduced.

When the cab 14 is tilted up around the tilt axis below the front end of the cab 14 for inspection and maintenance of the engine 16 and the like, the upstream side exhaust pipe 22a and the downstream side exhaust pipe 22b have the above-mentioned structure. Since the ejector portion is non-fixedly connected, the downstream side exhaust pipe 22b is tilted up and rotated integrally with the cab 14. When the handle 68 is rotated to the horizontal position shown in FIG. 3 before or after the cab 14 is tilted up, the first valve 62 closes the downstream side of the upstream side exhaust pipe 22a, and The 2 valve 64 is fully opened. Therefore, when the adjustment is performed while the engine 16 is being operated, the exhaust gas is diffused from the branch exhaust pipe 58 to the lower side and the rear side of the chassis frame 12, so that an operator working around the engine 16 is burned or has a high concentration. By directly breathing the exhaust gas, it is possible to effectively prevent the occurrence of problems such as deterioration of physical condition.

Further, according to the above structure, the downstream exhaust pipe 22b extending in the vertical direction is supported by the cab 14, and an independent supporting structure such as the supporting member 28 in the conventional structure is not required. Therefore, there are advantages that the weight and the manufacturing cost can be reduced, the space S between the cab 14 and the luggage box 18 can be reduced, and the effective volume of the luggage box 18 can be increased.

In the above embodiment, the first valve 62 and the second valve 62
Although a valve device including the valve 64 is shown as an example, a single switching valve may be provided at the connecting portion between the upstream side exhaust pipe 22a and the branch exhaust pipe 58 to change the exhaust gas passage. . Although not shown, the cab 14 is further tilted up to prevent the handle 68 from unintentionally rotating due to vibration or impact during traveling, and the engine 16 is rotated.
It is preferable to provide a safety device that locks the handle 68 with a stopper pin or the like so that the handle 68 does not unexpectedly rotate when the vehicle is operated and the adjustment is performed. Further, in the above-described embodiment, the valve device is configured to be operated by the manual operation of the handle 68, but an electromagnetic actuator, an air cylinder, a hydraulic cylinder, or the like, which automatically operates as the cab 14 is tilted up, is used. It is of course possible to control the valve device by means of a pressure-responsive actuator. In this case, for example, the electromagnetic actuator is energized in conjunction with the energization of the tilt motor that drives the oil motor that supplies the oil pressure to the tilt cylinder that tilts up the cab 14, and the output oil pressure of the oil motor is directly The pressure-responsive actuator can be actuated by utilizing the above.

In the illustrated embodiment, the upper end opening 56 of the downstream side exhaust pipe 22b has the roof 14 'of the cab 14.
A case is shown in which it is arranged at a higher position. Of course, it is effective for dilution of exhaust gas that the height of the opening 56 is as high as possible within an allowable limit, but the height of the packing box 18 is high. If the height is low, the opening 56 can be correspondingly arranged lower than the position shown, and in this case too, the chassis frame 1
It is obvious that the adverse effect of exhaust gas on pedestrians and the like can be alleviated more than the one in which the outlet of the exhaust pipe is arranged below 2.

[0025]

As described above, the vertical exhaust pipe device for a cab-over type truck according to the present invention has one end connected to the exhaust manifold of the engine disposed below the cab and the other end bent upward. An upstream exhaust pipe supported by a chassis frame adjacent to the rear wall of the cab and a vertically extending and mounted on the rear wall of the cab, the lower end opening of which is the upward opening end of the other end of the upstream exhaust pipe. A downstream side exhaust pipe that is externally fitted to the outside frame at a position higher than the chassis frame, and has one end connected to the upstream side of the upwardly bent portion of the upstream side exhaust pipe. It is installed near the junction between the branch exhaust pipe that opens to the outside at an end lower than the chassis frame and the upstream exhaust pipe and the branch exhaust pipe.Normally, substantially all of the engine exhaust gas is exhausted upstream. Tube And a valve device for circulating substantially all of the exhaust gas of the engine from the middle of the upstream exhaust pipe to the branch exhaust pipe when the cab is tilted up. Characteristic,
There are various advantages such as a simple structure and a light weight, a low manufacturing cost, a reduction in the required space between the cab and the luggage box, and an increase in the effective loading capacity.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged side view showing a branch exhaust pipe connection portion of FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a schematic side view of a conventional cab-over type truck having a vertical exhaust pipe.

[Explanation of symbols]

10 ... Cab-over type truck, 12 ... Chassis frame,
16 ... Engine, 18 ... Packing box, 20 ... Exhaust manifold, 22 ... Exhaust pipe, 22a ... Upstream exhaust pipe, 22b ... Downstream exhaust pipe, 24 ... Muffler, 58 ... Branch exhaust pipe, 62 ...
First valve, 64 ... Second valve, 68 ... Handle

Claims (1)

[Claims] 1. An upstream exhaust pipe, one end of which is connected to an exhaust manifold of an engine disposed below a cab, and the other end of which is bent upwardly and which is supported by a chassis frame adjacent to a rear wall of the cab, and the cab. It is mounted on the rear wall so as to extend in the vertical direction, and its lower end opening is externally fitted to the upward opening end of the other end of the upstream exhaust pipe with an outside air intake gap, and its upper end is positioned higher than the chassis frame. At a downstream side exhaust pipe which is open to the outside air, a branch exhaust pipe whose one end is connected to the upstream side of the upward bending portion of the upstream side exhaust pipe and the other end is open to the outside air at a position lower than the chassis frame, and the upstream side exhaust gas It is provided near the connecting portion between the pipe and the branch exhaust pipe, and normally, substantially all of the exhaust gas of the engine is circulated to the downstream exhaust pipe through the upstream exhaust pipe, and when the cab is tilted up, the engine is exhausted. A vertical exhaust pipe device for a cab-over truck, comprising: a valve device that allows substantially all of the exhaust gas of the engine to flow from the middle of the upstream exhaust pipe to the branch exhaust pipe.