JPH1178547A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve visibility for an operator by erecting a tail pipe for discharging exhaust gas from a muffler main body to the outside of a machine in the vicinity of the support of a cabin so as to prevent the appearance of the tail pipe in a visual field ahead of the operator sitting on a seat. SOLUTION: An engine E is installed in the bonnet of a machine body front part, and a muffler main body 1 is provided in the upper part of the engine E. In the right side of a cabin CB front face for covering a driving part, the tail pipe 2 is provided for discharging exhaust gas from the muffler main body 1. The tail pipe 2 is formed in a roughly L shape when seen from the front side, and the horizontal part 2b of its lower end is supported by a bracket 4 fixed in the lower end of the right side of the cabin CB front face. Also, from the outer side end of the horizontal part 2b, the vertical part 2a of the tail pipe 2 is erected upward. The lower part of the vertical part 2a is arranged along a part lower than the bent part of the support 11 of the cabin CB.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a muffler tail pipe in a work vehicle such as a tractor in which a cabin is mounted on a driving section and a muffler body is mounted on a hood at the front of the body.

[0002]

2. Description of the Related Art Conventionally, a cabin has been mounted on a driving unit,
A work vehicle such as a tractor having a muffler body inside a hood at the front of the fuselage is known, and a tail pipe of a muffler in such a work vehicle has a standing pipe protruding from an upper surface or a side surface of the hood. Yes, such a tailpipe was directly connected to the muffler body. For example, as shown in Japanese Utility Model Publication No. 62-1006. Further, a bracket for fixing the tail pipe and a bracket for mounting the direction indicator, the rearview mirror, and the like are individually provided.

[0003]

However, if the tailpipe of the muffler is arranged so as to protrude above the hood, the view in front of the operator who is sitting in the driver's seat and operating the aircraft is obstructed. If the tail pipe is directly connected to the muffler body, the engine vibration in the hood will be transmitted to the tail pipe. In addition, a bracket for fixing the tail pipe,
Providing individual brackets to which the turn indicators, rearview mirrors, and the like are attached requires a large number of brackets, resulting in high costs.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, the cabin is attached to the driving unit,
In a work vehicle in which a muffler body is provided inside a hood at a front part of a body, a tail pipe for discharging exhaust gas from the muffler body to the outside of the body is erected near a column of a cabin.

[0005] In a working vehicle having a cabin mounted on an operating section and a muffler main body mounted on a hood at a front portion of the fuselage, a tail pipe arranged near a column of the cabin for discharging exhaust gas from the muffler main body to the outside of the fuselage. And a flexible joint between the muffler body.

Further, in a work vehicle having a tail pipe for discharging exhaust gas from the muffler body to the outside of the machine body, the tail pipe is formed in a three-layer structure, and a bracket is fixedly mounted on the innermost layer, and the bracket is fixed to the bracket. A fixed gap is provided between the inner layer and the intermediate layer, and the intermediate layer is fixed to the intermediate layer by using a fixture for fixing the intermediate layer to the bracket and fixing the outer layer to the intermediate layer. The outermost layer was attached by providing a gap, the intermediate layer was formed by forming a plate-like member into a substantially pipe shape, and the outermost layer was formed by forming a plate-like member having a large number of holes into a substantially pipe-like shape.

Further, in a working vehicle having a cabin mounted on an operating part and a muffler body mounted on a hood at a front part of the machine body, a bracket is fixed to a column of the cabin, and a tail for discharging exhaust gas from the muffler body to the outside of the machine body. Pipes,
It was fixed by the bracket, and a turn signal and a rearview mirror were attached to the bracket.

[0008]

Next, an embodiment of the present invention will be described. 1 is an overall side view showing a tractor which is an embodiment of a work vehicle according to the present invention, FIG. 2 is a side view showing an arrangement state of a muffler in a front part of an aircraft, FIG. 3 is a front view thereof, and FIG. FIG. 5 is a plan view showing a front view range of an operator sitting on a seat, FIG. 5 is a front view showing a tail pipe, FIG. 6 is a side view of the same, FIG. 7 is a plan view showing a bracket fixed to a vertical portion of the tail pipe, 8 is a side view, FIG. 9 is a side view showing an insulating plate forming an insulating tube which is an intermediate layer of a tail pipe having a three-layer structure, and FIG. 10 is also a heat insulating plate having a substantially semicircular shape. FIG. 11 is a side view showing a cooling plate forming a cooling pipe which is the outermost layer of a tail pipe having a three-layer structure, and FIG. 12 is a state in which the cooling plate is curved in a substantially semicircular shape. FIG. 13 is a sectional view of the tail pipe cut into a vertical portion. Side cross-sectional view showing a mounting state of the tube and a cooling tube, 14 is a side view showing a special bolt, Figure 1
5 is a block diagram showing a mechanism for displaying the number of revolutions of the PTO shaft P, and FIG. 16 is a diagram showing an instrument panel disposed at the front of the operating section.

First, the overall configuration of a tractor which is an embodiment of the work vehicle according to the present invention will be described with reference to FIG. A hood B is disposed at the front of the machine for suspending the front and rear wheels FW and RW in front and rear. An engine E is built in the hood B, and a muffler body 1 is attached to an upper portion of the engine E. ing. A steering handle ST is provided behind the hood B, and a seat SE is provided behind the steering handle ST. The steering handle ST and the seat SE are covered by a cabin CB. A muffler tail pipe 2 is provided upright in the vicinity of a column on one side of the front portion of the cabin CB so as to discharge exhaust gas discharged from the muffler body 1 to the outside of the body. The cabin CB is fixed to the body via an elastic member such as an anti-vibration rubber, for example, and the vibration of the body is hardly transmitted to the cabin CB, and the cabin CB is configured to reduce noise in the cabin CB. I have. The cabin has a so-called floating structure.

[0010] A clutch housing CH is connected to the rear of the engine E, and a transmission case M is connected to the rear of the clutch housing CH.
To be driven. The driving force of the engine E is transmitted to a power take-out shaft P protruding from the rear end of the transmission case M, and the power take-out shaft (hereinafter referred to as a PTO shaft).
P is driven to drive a working machine connected to the rear end of the machine.

Next, a description will be given of a muffler provided at the front of the fuselage. 2 to 4, an engine E is mounted on a hood B at the front of the fuselage, and a muffler main body 1 is attached to an upper portion of the engine E. A tail pipe 2 of a muffler that discharges exhaust gas discharged from the muffler body 1 to the outside of the fuselage is disposed on the right side of the front surface of the cabin CB that covers the operation unit. The tail pipe 2 is formed in a substantially L shape in a front view, and a horizontal portion 2b at a lower end thereof is supported by a bracket 4 fixed to a lower end of a right front portion of the cabin CB. A vertical portion 2a of the tail pipe 2 stands upward from the outer end of the horizontal portion 2b.

The front pillars 11 and 12 of the cabin CB are bent in the middle and formed in a substantially "C" shape in side view.
The lower part of the vertical portion 2a is arranged along a portion below the bent portion of the column 11. And the vertical portion 2a
The portion above the bent portion of the front strut 11 is
It is erected. A tail pipe bracket 5 is fixed to a portion of the front column 11 of the cabin CB above the bent portion, and the vertical section 2a of the tail pipe 2 is fixed to the front column by the tail pipe bracket 5. 1
Fixed to 1.

One end of a flexible joint 3 is connected to the inner end of the horizontal portion 2b of the tail pipe 2, and the other end is connected to the muffler main body 1 so that the flexible joint 3
Connects the muffler body 1 and the tail pipe 2. The flexible joint 3 is formed of a flexible member, and is configured not to transmit vibration from the muffler body 1 connected to the other end to the horizontal portion 2b of the tail pipe 2 connected to one end. In the present embodiment, the flexible joint 3 is formed of a flexible aluminum member that is formed to be extendable and contractible.

A directional support 13 and a rearview mirror 14 are mounted on the tailpipe bracket 5 for fixing the position of the tailpipe 2 to the front column 11. That is,
The tail pipe bracket 5 also serves as a bracket for fixing the position of the tail pipe 2, a bracket for mounting the directional support 13, and a bracket for mounting the rearview mirror 14. A bracket 5 ′ is fixed to the front support column 12 on the opposite side of the front support column 11 in the left-right direction.
A direction support 13 'and a rearview mirror 14' are attached to the bracket 5 '.

In FIG. 4, the front support column 1 of the cabin CB
The vertical portion 2a of the tail pipe 2 arranged near 1
It is arranged in a position that does not obstruct the field of view in front of the operator sitting on the seat SE of the driving section. That is, from the line of sight of the operator sitting on the seat SE, the vertical portion 2a is located in front of the front column 11, and the vertical portion 2a is positioned on the front column 11.
It is placed in a position that cannot be seen by overlapping. As a result, the field of vision in front of the operator is
Left and right front supports 1 as in the case where the
4 is secured over the entire area between 1.1 and 12.
The range from the visibility limit line L1 to the visibility limit line L2 shown in FIG.

Next, the configuration of the tail pipe 2 will be described. In FIGS. 2 to 4, a heat insulating tube 21 is externally fitted to the outer peripheral portion of the vertical portion 2 a of the tail pipe 2, and a cooling pipe 22 is externally fitted to the outer peripheral portion of the heat insulating tube 21. That is,
The tail pipe 2 has a vertical portion 2a in the innermost layer,
Are formed in a three-layer structure in which an intermediate layer and the cooling pipe 22 are the outermost layer. The vertical part 2a which is the innermost layer is shown in FIG.
As shown in FIG. 6, the horizontal portion 2b stands upright from one end of the horizontal portion 2b. A plurality of brackets 25 are fitted to the vertical portion 2a, and the brackets 25 allow the heat insulating pipe 21 to be attached and fixed to the outer peripheral portion of the vertical portion 2a.

As shown in FIG. 7 and FIG.
Is formed in a substantially ring shape, and the bracket 25 fitted in the vertical portion 2a is welded to the inner peripheral portion 25a of the bracket 25 and the outer peripheral portion of the vertical portion 2a to thereby form the vertical portion 2a.
a. Also, on the outer periphery of the bracket 25,
A plurality of intermediate layer attaching portions 25b projecting downward are formed, and the heat insulating pipe 21 is attached to the outer peripheral portion of the vertical portion 2a by screw holes 25c formed in the intermediate layer attaching portions 25b. It is configured to be fixed.

The heat insulating pipe 21 is formed by combining two heat insulating plates 21a shown in FIG. The heat insulating plate 21a is a plate-like member, and fixing holes 21b are provided at both ends in the short direction.
(Four in this embodiment) are formed. As shown in FIG. 10, this heat insulating plate 21a is curved in a substantially semicircular shape in a plan view, and two heat insulating plates 21a are arranged to face each other to form a substantially circular shape in a plan view.・
The heat insulating tube 21 is configured by adjusting the positions of 21b. The fixing hole 21b of the heat insulating pipe 21
The heat insulating tube 21 is attached to the vertical portion 2a by connecting the fixing hole 25c formed in the intermediate layer attaching portion 25b of the bracket 25 with a special bolt 26 described later.

The cooling pipe 22 provided on the outer periphery of the heat insulating pipe 21 is constituted by combining two cooling plates 22a shown in FIG. The cooling plate 22a is a plate-like member, and a plurality of (four in this embodiment) fixing holes 22b are formed at both ends in the short direction. The cooling plate 22a has a large number of long holes 22c
.. are formed to form a so-called punched metal. The cooling plate 22a is curved in a substantially semicircular shape in plan view as shown in FIG. 12, and two heat insulating plates 22a are arranged to face each other to form a substantially circular shape in plan view. The cooling pipe 22 is formed by adjusting the positions of 22b. The special bolts 26 are inserted into the fixing holes 22b of the cooling pipe 22 to attach the cooling pipe 22 to the vertical portion 2a.

That is, the heat insulating pipe 21 and the cooling pipe 22 configured as described above are attached to the vertical portion 2a of the tail pipe 2 as follows. As shown in FIG. 13, the intermediate layer mounting portion 25b of the bracket 25 fitted to the vertical portion 2a
And the heat insulating pipe 21 are connected by a special bolt 26. The special bolt 26 is, as shown in FIG.
a is a bolt having screw portions 26b on both sides thereof, and one of the screw portions 26b is inserted into the fixing hole 25c of the intermediate layer mounting portion 25b of the bracket 25 and the fixing hole 21b of the heat insulating tube 21. Bracket 25 and heat insulation pipe 2
1 is connected. Further, the other screw portion 26b of the special bolt 26 is inserted into the fixing hole 22b of the cooling pipe 22, and a nut 27 is screwed from the tip of the screw portion 26b. It is attached and fixed to the outer periphery.

A fixed gap D1 is formed between the vertical portion 2a and the heat insulating pipe 21 by the bracket 25.
A gap D2 is formed between the heat insulating pipe 21 and the cooling pipe 22 by the thickness of the head 26a of the special bolt 26.
By providing the gap D1, an air layer is formed between the vertical part 2a and the heat insulating pipe 21, so that the exhaust heat in the vertical part 2a is not easily transmitted to the heat insulating pipe 21. Further, by providing the gap D2, the long hole 2 of the cooling pipe 22 can be formed.
The flow of cooling air from 2c, 22c... Between the heat insulating pipe 21 and the cooling pipe 22 becomes active, and cooling of the heat insulating pipe 21 heated by the exhaust heat is promoted. The gap D1 can be changed by changing the size of the bracket 25, and the gap D2 can be changed by changing the thickness of the head 26a of the special bolt 26.

Since the muffler is constructed as described above and the muffler main body 1 and the tail pipe 2 are connected by the flexible hose 3, it is possible to prevent the vibration of the engine E and the muffler main body 1 from being transmitted to the tail pipe 2. Was completed. The cabin C having a floating structure
Even when B is displaced with respect to the airframe, the tail pipe 2 fixed to the cabin CB can follow the movement.

Then, the tail pipe 2 is connected to the cabin CB.
, The tail pipe 2 does not enter the front view of the operator seated on the seat SE and does not obstruct the view of the operator, so that the visibility can be improved. it can.

Further, since the directional support 13 and the rearview mirror 14 are attached to the tail pipe bracket 5 for fixing the tail pipe 2 to the cabin CB, the number of brackets can be reduced, and the cost can be reduced. it can.

Further, the tail pipe 2 is connected to a vertical portion 2a,
Since it is configured in a three-layer structure including the heat insulating pipe 21 and the cooling pipe 22, the exhaust heat in the vertical portion 2a is
, So that it is not released to the outside, and the cooling pipe 22
It was possible to cool by the cooling air that entered into the inside, and it was possible to prevent the exhaust heat from being transmitted to the operator and the like, thereby improving the comfort and safety of the operator and the like.

Next, the mechanism for displaying the number of rotations of the PTO shaft P will be described. FIG. 15 shows a block diagram of a rotation number display mechanism of the PTO shaft P. The PTO axis P is P
PTO which is a switch for changing the number of gears of TO shaft P
When either the first speed switch 32 or the PTO second speed switch 33 is turned on and the PTO switch 31 is turned on, the PTO shaft P is configured to rotate at a speed corresponding to the number of gears. By this rotation of the PTO shaft P, P
A TO operation is to be performed.

In FIG. 15, the rotational speed of the engine E is input from the electronic governor controller 34 to the arithmetic unit 35, and the ON / OFF signal of the PTO switch 31 and the ON / OFF of the PTO 1 speed switch 32 and the PTO 2 speed switch 33 are turned on. An OFF signal is input to the arithmetic unit 35; Then, these input signals are calculated by the calculation device 35, and the rotation speed of the PTO shaft P is calculated based on the calculation result.
Display or non-display is performed by a liquid crystal display (LCD) 36 as a display unit. That is, PT
An ON signal is input from the O switch 31 and the PTO
When an ON signal is input from either the first speed switch 32 or the PTO second speed switch 33, the rotation speed of the PTO shaft P is displayed by a liquid crystal display (LCD) 36,
In other cases, the number of rotations of the PTO shaft P is not displayed. The electronic governor controller 34
Is connected to a tachometer 42, which will be described later, and is configured to display the number of revolutions of the engine E detected by the electronic governor controller 34 on the tachometer 42.

In response to the input of the ON signal from the PTO 1st speed switch 32 to the arithmetic unit 35 and the input of the ON signal from the PTO 2nd speed switch 33 to the arithmetic unit 35, the corresponding constant values are calculated. A PTO axis P displayed on a liquid crystal display (LCD) 36 is calculated by calculating an input signal of the number of revolutions of the engine E from the electronic governor controller 34 and these constant values. The number of rotations is determined.
That is, the PTO axis P displayed on the liquid crystal display (LCD) 36
Is calculated based on the rotation speed of the engine E and the number of gears of the PTO shaft P.

In this way, the rotation speed of the PTO shaft P during the PTO operation is calculated and displayed. When the rotation number of the PTO shaft P is not displayed on the liquid crystal display (LCD) 36, that is, when the PTO operation is not performed, the integrated value of the operating time is displayed on the liquid crystal display (LCD) 36. The liquid crystal display (LCD) 36 is used as an hour meter.

FIG. 16 shows an instrument panel 41 provided at the front of the operating section. At the center of the instrument panel 41, a tachometer 42 for displaying the number of revolutions of the engine E is provided. I have. A liquid crystal display (LCD) 36 for displaying the number of rotations of the PTO shaft P and the integrated value of the operating time is provided below the tachometer 42.
Is arranged. Thereby, the operator during the work can easily recognize the rotation speed of the PTO shaft P.

As described above, the rotation speed of the PTO shaft P is calculated based on the input signal to the arithmetic unit 35, and the rotation speed of the PTO shaft P and the integrated value of the operating time are calculated.
D) 36, and the liquid crystal display (LCD) 36 is arranged at the center of the instrument panel 41,
The display for displaying the number of rotations of the TO shaft P and the display for displaying the integrated value of the operating time can be shared by one display 36, so that the cost can be reduced, and even during work. Thus, the number of rotations of the PTO shaft P can be easily recognized. The number of revolutions of the PTO shaft P is determined by an input signal to the arithmetic unit 35 for the number of revolutions of the engine E and the PTO
Switch 31, PTO first speed switch 32, and PTO
Since the calculation is performed based on the input signal to the arithmetic unit 35 of the second speed switch 33, there is no need to install a rotation speed detecting means such as an electromagnetic pickup inside the mission, and it is not necessary to consider waterproofness and dustproofness. The design of the fuselage becomes easy, and the cost can be reduced.

[0032]

As described above, the present invention has the following advantages. That is, as described in claim 1, the tail pipe for discharging exhaust gas from the muffler body to the outside of the body is erected near the column of the cabin, so that the tail pipe can be seen from the front of the operator sitting on the seat. Since the figure does not enter and does not block the field of view of the operator, the visibility can be improved.

Furthermore, a flexible joint is interposed between the muffler main body and a tail pipe arranged near the support column of the cabin for discharging exhaust gas from the muffler main body to the outside of the machine body. The vibration of the muffler body and the like can be prevented from being transmitted to the tail pipe, and the vibration damping effect of the tail pipe and the cabin to which the tail pipe is fixed can be improved. Further, even when the cabin having the floating structure is displaced with respect to the body, the tail pipe fixed to the cabin can follow the movement.

Further, the tail pipe is formed in a three-layer structure, a bracket is fixedly provided on the innermost layer, and a fixed gap is provided between the tail pipe and the innermost layer. In the intermediate layer, using a fixing tool for fixing the intermediate layer to the bracket and fixing the outermost layer to the intermediate layer, attaching the outermost layer with a certain gap with the intermediate layer,
The intermediate layer is formed by forming a plate-like member into a substantially pipe shape, and the outermost layer is formed by forming a plate-shaped member having a large number of holes into a substantially pipe shape, so that exhaust heat in the innermost layer is formed. The intermediate layer can block the heat from being released to the outside, and can be cooled by cooling air entering the outermost layer from the long hole of the outermost layer, thereby preventing the exhaust heat from being transmitted to the operator or the like. Thus, the comfort and safety of the operator and the like can be improved.

Further, a bracket is fixedly mounted on a column of the cabin, and a tail pipe for discharging exhaust gas from the muffler body to the outside of the body is fixed by the bracket, and a direction indicator is attached to the bracket. In addition, since the rearview mirror is mounted, the number of brackets can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall side view showing a tractor as an embodiment of a work vehicle according to the present invention.

FIG. 2 is a side view showing an arrangement state of a muffler in a front part of the fuselage.

FIG. 3 is a front view of the same.

FIG. 4 is a plan view showing a range of vision in front of an operator sitting on a seat of a driving unit.

FIG. 5 is a front view showing a tail pipe.

FIG. 6 is a side view of the same.

FIG. 7 is a plan view showing a bracket fixed to a vertical portion of the tail pipe.

FIG. 8 is a side view of the same.

FIG. 9 is a side view showing a heat insulating plate that forms a heat insulating tube which is an intermediate layer of a tail pipe having a three-layer structure.

FIG. 10 is a plan view showing a state where the heat insulating plate is curved in a substantially semicircular shape.

FIG. 11 is a side view showing a cooling plate forming a cooling pipe which is an outermost layer of a tail pipe having a three-layer structure.

FIG. 12 is a plan view showing a state where the cooling plate is curved in a substantially semicircular shape.

FIG. 13 is a side cross-sectional view showing a state where a heat insulating pipe and a cooling pipe are attached to a vertical portion of a tail pipe.

FIG. 14 is a side view showing a special bolt.

FIG. 15 is a block diagram showing a rotation speed display mechanism of the PTO shaft P.

FIG. 16 is a view showing an instrument panel provided at a front part of the operation unit.

[Explanation of symbols]

 B Bonnet E Engine M Transmission case P Power take-off shaft (PTO shaft) L1, L2 Limit of visibility CB Cabin FW Front wheel RW Rear wheel SE Seat ST Steering handle 1 Muffler body 2 Tail pipe 2a Vertical section 2b Horizontal section 3 Flexible pipe 4 Bracket 5 Tail pipe bracket 11 ・ 12 Front support (of cabin) 13 ・ 13 ′ Direction indicator 14 ・ 14 ′ Rearview mirror 21 Heat insulation pipe (intermediate layer) 21a Heat insulation plate 22 Cooling pipe (outermost layer) 22a Cooling plate 25 Bracket 26 Special bolt 31 PTO switch 32 PTO 1 speed switch 33 PTO 2 speed switch 34 Electronic governor controller 35 Operation unit 36 Liquid crystal display (LCD) 41 Instrument panel

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Susumu Akashima 1-32 Chaya-cho, Kita-ku, Osaka City, Osaka Inside Yanmar Diesel Co., Ltd.

Claims (4)

[Claims] 1. A work vehicle in which a cabin is mounted on a driving section and a muffler body is installed in a hood at a front portion of the machine body, and a tail pipe for discharging exhaust gas from the muffler body to the outside of the machine body is provided near a column of the cabin. A work vehicle characterized by being provided. 2. A work vehicle in which a cabin is mounted on an operation unit and a muffler body is installed in a hood at a front part of a machine body, and a tail pipe is disposed near a column of the cabin for discharging exhaust gas from the muffler body to the outside of the machine body. And a muffler body and a flexible joint interposed therebetween. 3. A work vehicle having a tail pipe for discharging exhaust gas from a muffler body to the outside of the body, wherein the tail pipe has a three-layer structure, and a bracket is fixedly provided on an innermost layer. A fixed gap is provided between the inner layer and the intermediate layer, and the intermediate layer is fixed to the intermediate layer by using a fixture for fixing the intermediate layer to the bracket and fixing the outer layer to the intermediate layer. The outermost layer is attached with a gap, the middle layer is formed by forming a plate-like member in a substantially pipe shape, and the outermost layer is formed by forming a plate-like member having a large number of holes formed in a substantially pipe-like shape. A working vehicle characterized by the following. 4. A work vehicle in which a cabin is mounted on a driving unit and a muffler body is installed in a hood at a front part of a machine body, a bracket is fixed to a column of the cabin, and a tail for discharging exhaust gas from the muffler body to the outside of the machine body. A work vehicle wherein a pipe is fixed by the bracket, and a direction indicator and a rearview mirror are attached to the bracket.