JPH032410Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an exhaust structure for industrial vehicles such as forklifts and trucks.

(Prior Art) As a conventional exhaust structure for industrial vehicles, for example, as shown in FIG. 5, a push-out fan 102 is attached to the rear of an engine 101,
An engine radiator 103 is disposed behind the engine 02, and an exhaust muffler 104 that communicates with the exhaust pipe (not shown) of the engine 101 is disposed behind the radiator 103. 104a.
A counterweight 105 is attached to the vehicle body frame (not shown) with bolts 10 behind the radiator 103.
7 etc., and inside this counterweight 105 is a radiator 103.
A cooling ventilation hole 108 for discharging the cooling air after passing through and cooling, and an exhaust hole 109 for discharging the exhaust gas G from the exhaust tube 104a of the exhaust muffler 104 are provided, respectively.

However, in such a conventional exhaust structure, the exhaust muffler 104 and the radiator 103
Counterweight 105 when inspecting or replacing
To prevent interference between the counterweight 105, the exhaust muffler 104, and the exhaust tube 104a when attaching and detaching the counterweight 105, a certain gap must be maintained between them. Since the mounting structure was designed to facilitate attachment and detachment of the counterweight 105 by providing a certain gap between them, the exhaust gas G discharged from the exhaust tube 104a is introduced into the exhaust hole 109 in the counterweight 105. As a result, the blown back exhaust gas G may leak into the tire house or from the cooling ventilation holes 108 and blow onto the operator, which is not good for health and hygiene.
There was a problem in that the cooling performance of the radiator 103 was significantly deteriorated by being blown into the engine room again. Such a problem is particularly noticeable when the vehicle is traveling backwards, even though the exhaust hole 109 and the cooling ventilation hole 108 are separated and the exhaust hole 109 is directed downward.

Therefore, in order to solve the above-mentioned conventional problems, the sixth
As shown in the figure, an exhaust tube 10 is located within a common passage 110 that serves as an exhaust hole and a cooling ventilation hole.
4a is connected to a tail tube 112 via a connection clamp 111, and the exhaust gas G from the exhaust tube 104a is directly discharged to the rear of the counterweight 105 through the tail tube 112. However, even in this conventional example, although the drawbacks of the first conventional example are avoided, the attachment portion of the tail tube 112 to the exhaust tube 104a is located at the counterweight 10.
5, so when attaching and detaching the counterweight 105, the tail tube 112
There was another problem in that it was difficult for the operator to intervene when removing the parts, which significantly worsened maintenance workability.
In addition, as a reference, there is Utility Model Application Publication No. 57-8118.

(Purpose of the invention) The present invention was developed by focusing on these contradictory problems with the conventional methods.It eliminates blowback and leakage of exhaust gas to protect the health of operators, and at the same time prevents the deterioration of the cooling performance of the radiator. It is an object of the present invention to provide an exhaust structure for an industrial vehicle in which a counterweight can be easily attached and detached during maintenance and inspection of an exhaust muffler and a radiator.

(Structure of the invention) In order to achieve the above object, the present invention has a structure in which a tail tube is extendably connected to an exhaust tube extending from an exhaust muffler, and when the engine is operated, the tail tube is extended and formed in a counterweight. The tail tube is fitted into the exhaust hole to reduce the gap between the exhaust hole and the exhaust tube, and is configured to contract the tail tube and escape from the exhaust hole when performing maintenance or inspection of the radiator or exhaust muffler. Ru.

(Example) This invention will be explained below based on the drawings.

1 to 3 show a first embodiment in which this invention is applied to the exhaust structure of a forklift, and FIG. 1 shows the overall structure of the forklift. To explain the exhaust structure of the present invention based on FIG. 2, an extrusion type fan 2 is attached to the rear of the engine 1 when viewed from the front of the vehicle, and an engine radiator 3,
An exhaust muffler 5 and a counterweight 6 communicate with the exhaust port of the engine 1 via the exhaust pipe 4
are arranged in sequence.

The counterweight 6 has its middle portion hooked onto a hook 8 provided on the vehicle body frame 7, and its lower portion attached to a mounting bracket 9 provided on the vehicle body frame 7 with bolts 10. The counterweight 6 also has a cooling ventilation hole 11 for discharging the cooling air after cooling through the radiator 3, and an exhaust hole 13 for discharging the exhaust gas G from the exhaust tube 12 of the exhaust muffler 5. Each is drilled.

The exhaust tube 12 is formed in an L-shape as a whole, and is attached to the exhaust muffler 5 at its base end so as to be able to swing back and forth, and at its tip end, as shown in FIG. A tail tube 14 is connected so as to be slidable in the axial direction along the outer circumferential surface.

A pressure receiving plate 15 is provided on the inner circumferential surface of the rear end of the tail tube 14 and protrudes radially inward.
Exhaust gas G flowing into the tail tube 14 from 2
receives a pressing force backward, that is, in the direction of extension.

A coil spring 17 serving as a moving means is stretched between a bracket 14a provided on the outer peripheral surface of the front end of the tail tube 14 and a bracket 12a provided on the outer peripheral surface of the exhaust tube 12. As a result, the tail tube 14 is urged forward, that is, in the direction of contraction. coil spring 1
The set load 7 is set in advance to be smaller than the pressing force applied to the pressure receiving plate 15 by the exhaust gas G, so that the tail tube 14 is pressed against the pressure receiving plate 15 by the exhaust gas G.
It is expanded against the biasing force of the coil spring 17 due to the pressing force applied to the coil spring 17.

The rear end of the tail tube 14 is arranged to face the exhaust hole 13 formed in the counterweight 6, and when the tail tube 14 is extended,
Most of it fits into the exhaust hole 13, as shown by the solid line in FIG. 3, and when it contracts, it almost completely escapes from the exhaust hole 13 to the outside, as shown by the chain line in FIG. ing.

The front end edge of the tail tube 14 is bent inward to form an annular flange 18, and this inward flange 18 allows exhaust air to flow between the inner peripheral surface of the front end of the tail tube 14 and the outer peripheral surface of the tip end of the exhaust tube 12. In addition to preventing gas G from leaking, when the tail tube 14 is extended, the flange 18 comes into contact with an annular stopper flange 19 formed by bending the tip edge of the exhaust tube 12 outward, thereby limiting the extension of the tail tube 14. are becoming regulated. In addition, the reduction limit of the tail tube 14 is:
The pressure is regulated by the pressure receiving plate 15 at the rear end coming into contact with the stopper flange 19 at the tip of the exhaust tube 12.

Next, the operation of the present invention will be explained.

When the engine 1 is started, the exhaust gas G discharged from the engine 1 passes through the exhaust pipe 4, the exhaust muffler 5, and the exhaust tube 12 to the tail tube 1.
4 into the exhaust hole 13 in the counterweight 6, and is discharged from there to the rear of the counterweight 6. However, when the exhaust gas G passes through the tail tube 14, the pressure receiving plate 1 in the tail tube 14
5, a backward pressing force is added by the exhaust gas G,
The tail tube 14 is loaded with a coil spring 17 until the inward annular flange 18 at its front end abuts the outward stop flange 19 at the rear end of the exhaust tube 12.
It is moved and extended toward the rear of the vehicle with respect to the exhaust tube 12 against the urging force of the counterweight 6, and most of it is fitted into the exhaust hole 13 in the counterweight 6. Therefore, the exhaust hole 13 is smaller than the tail tube 14.
The exhaust gas G discharged to the counterweight 6
There is almost no chance of it being blown back to the front or leaking.

On the other hand, when the engine 1 is stopped, the tail tube 14 is held against the exhaust tube 12 by the coil spring 17 until the pressure receiving plate 15 protruding from the inner surface of the rear end comes into contact with the stopper flange 19 at the tip of the exhaust tube 12. Moves to the front of the vehicle, contracts,
The rear end of the tail tube 14 escapes to the outside through the exhaust hole 13 in the counterweight 6. Therefore, check the exhaust muffler 5 and radiator 3,
When replacing the counterweight 6, the counterweight 6 can be easily attached to and removed from the vehicle body frame 7 without interfering with the tail tube 14, and the work efficiency can be significantly improved.

FIG. 4 shows a second embodiment of the invention. In this embodiment, instead of connecting the tension coil spring 17 between the bracket 12a on the outer periphery of the exhaust tube 12 and the bracket 14a on the outer periphery of the tail tube 14 as in the first embodiment, a tension coil spring 17 is connected to the bracket 14a of the tail tube 14. A cable 20 such as Bowden wire as a means of transportation is connected, and the cable 20
The tail tube 14 can be contracted relative to the exhaust tube 12 by a pulling operation. The structure and operation of this embodiment other than those described above are the same as those of the first embodiment, so detailed explanation thereof will be omitted.

(Effects of the invention) As explained above, according to this invention,
When the engine is running, the tail tube, which is extendably connected to the rear end of the exhaust tube, is expanded by the exhaust gas and inserted into the exhaust hole in the counterweight, thereby preventing exhaust gas from blowing back or leaking. You can protect your health and avoid deterioration in the cooling performance of the radiator. On the other hand, when performing maintenance or inspection of the radiator or exhaust muffler, the tail tube can be contracted and escaped from the exhaust hole, which can prevent the cooling performance of the radiator from decreasing. The weight can be easily attached and detached from the vehicle frame without interfering with the tail tube. In addition, since the tail tube is configured to be expandable and retractable relative to the exhaust tube, the gap between the exhaust tube and the counterweight can be made much smaller than with conventional structures, and the weight of the counterweight can be increased by that amount. It is.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a schematic side view of a forklift equipped with an exhaust structure according to the present invention, and FIG. 2 is a longitudinal sectional view of the exhaust structure according to the present invention. , Figure 3 is a longitudinal sectional view of the main part,
FIG. 4 is a longitudinal sectional view similar to FIG. 3, showing a second embodiment of the present invention, and FIGS. 5 and 6 are longitudinal sectional views showing different conventional exhaust structures. 5...Exhaust muffler, 6...Counterweight, 12...Exhaust tube, 13...Exhaust hole, 1
4... Tail tube, 15... Pressure receiving plate, 17...
... Coil spring (moving means), 20... Cable (moving means).

Claims (1)

[Scope of utility model registration request] An exhaust system for an industrial vehicle in which an exhaust muffler and a counterweight are sequentially arranged behind the engine, and exhaust gas from the engine is discharged from an exhaust tube extending from the exhaust muffler to the rear of the vehicle through an exhaust hole formed in the counterweight. In the structure, a tail tube is extendably connected to the exhaust tube, a pressure receiving plate is provided on the inner circumferential surface of the tail tube to receive a pressing force in the direction of extension by engine exhaust gas, and the tail tube is contracted. A moving means capable of moving the tail tube in the direction is provided, and the rear end of the tail tube is arranged to face the exhaust hole of the counterweight, so that the tail tube fits into the exhaust hole when extended and closes the exhaust hole when contracted. An exhaust structure for an industrial vehicle, characterized in that the exhaust structure is adapted to escape from the air.