JP2002264668A - Tail tube structure of silencer - Google Patents

Abstract

(57) [Abstract] [Problem] To improve appearance and visibility,
It is an object to improve a heat shielding effect of a heat shielding plate. A tail pipe (64) is projected upward from a bonnet (4), and a tail pipe (64) of a silencer (62) is arranged inside and at an upper corner from left and right outermost ends of the bonnet (4) to discharge exhaust gas from the tail pipe (64). With the opening of the diagonally outward and forward,
The heat shield plate 15 covering the tail pipe 64 was attached to the hood 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tail pipe structure of a silencer disposed on a working vehicle or the like. More specifically,
The present invention relates to a tail pipe structure of a silencer projecting from a bonnet and a mounting structure of a cover for covering the tail pipe.

[0002]

2. Description of the Related Art Conventionally, an exhaust pipe from an engine is provided so as to protrude greatly above a vehicle body and is erected to exhaust engine exhaust at a high position. There are many known configurations configured to discharge engine exhaust at a very low position. Further, there is known an arrangement in which a tail pipe of a silencer is arranged on a side of a tractor bonnet. A heat shield plate is attached to the tail pipe of the silencer, and the heat shield plate avoids contact with the tail pipe, which becomes hot due to exhaust gas of the engine. The heat shield plate is directly connected to the tail pipe of the silencer, and has a configuration projecting from the opening of the hood together with the tail pipe. In addition, as disclosed in Japanese Patent Application Laid-Open No. 8-144756, in a work vehicle in which an exhaust pipe extends upward from an engine, a radiator and a cooling fan are arranged above the engine, and an upper end of the exhaust pipe is provided. The outlet is arranged at substantially the same level as the upper part of the radiator and in the diffusion flow area of the cooling exhaust air passing through the radiator, and the engine exhaust is prevented from flowing to the driver side by the cooling exhaust air. Some are known that can dilute and diffuse engine exhaust.

[0003]

In a configuration in which the tailpipe protrudes greatly above the hood, the field of view may be obstructed by the tailpipe. And in the structure which arrange | positions a tail pipe toward the front lower part, the straw and fertilizer of a field may soar by exhaust of a tractor. In addition, when the tail pipe of the silencer is disposed on the side, visibility may be reduced, and detachability of the side cover may not be easily performed. When mounting the heat shield directly on the silencer tail pipe,
The heat of the tail pipe is transmitted to the heat shield plate, and the temperature of the tail pipe is likely to be high. Therefore, the opening of the hood for passing the tail pipe and the heat shield plate needs to be enlarged, and the design of the external appearance may be limited.
In the technique disclosed in Japanese Patent Application Laid-Open No. 8-144756, it is necessary to greatly change the arrangement of the engine, the exhaust pipe, the radiator and the cooling fan,
Since the configuration of the work vehicle needs to be changed in accordance with the change in the arrangement, and since the radiator and the cooling fan are arranged above the engine, the height position of the hood covering the engine is increased. For this reason, the visibility of the front may be sacrificed.

[0004]

In order to solve the above problems, the present invention uses the following means. As described in claim 1, in the tail pipe structure of the silencer connected to the exhaust pipe for discharging the exhaust gas of the engine, the tail pipe of the silencer projects upward from the bonnet,
The tail pipe of the silencer was disposed inside the left and right outermost ends of the bonnet and at the upper corner. As described in claim 2, the exhaust pipe exhaust opening of the tail pipe is directed obliquely outward and forward. According to a third aspect of the present invention, a cover for covering the tail tube is attached to the bonnet.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problems and means to be solved by the present invention are as described above. Next, an embodiment of the present invention shown in the attached drawings will be described. 1 is a front perspective view of a crawler tractor, FIG. 2 is an overall side view, FIG. 3 is a side view showing an arrangement of an engine, an HST and a transmission case, FIG. 4 is a side view showing an arrangement configuration of a silencer and a tail pipe, and FIG. 6 is a front view, FIG. 6 is a plan view, FIG. 7 is a perspective view showing an arrangement configuration of a shielding plate, FIG. 8 is a diagram showing an assembly configuration of a heat shielding plate, and FIG. Schematic diagram shown by FIG. 1, FIG.
0 is a schematic diagram showing the state of view from the driver's seat in plan view.

First, a schematic configuration of a crawler tractor which is an embodiment having a tail pipe structure of a silencer according to the present invention will be described. As shown in FIGS. 1 and 2, an engine 3 is disposed above a front portion of the crawler traveling device 1, and a rear transmission case 5 is disposed above a rear portion. The engine 3 is covered by a bonnet 4 and the engine 3 is fixed between lower left and right main frames 6,6. A steering column 2 is provided at a rear portion of the hood 4, a round steering handle 7 for performing a steering operation is disposed on the steering column 2, and a seat 8 is disposed behind the steering handle 7. Step 18 is placed below between 2 and the seat 8,
It constitutes the driving unit. These operating parts are covered by a cabin 9. At the rear end of the vehicle, a three-point link type mounting device 10 for mounting various working machines is provided.

[0007] The crawler-type traveling device 1 is supported by a crawler frame 15.
A front transmission case 16 is fixed to the front end of the drive sprocket 11 to support the drive sprocket 11, and an idler 12,
Are rotatably supported between the driving sprocket 11 and the idler 12, and a crawler belt 14 surrounds the driving sprocket 11, the idler 12, and the rolling wheels 13, 13. It is winding.

Next, the drive transmission system of the crawler tractor will be described with reference to FIG. A damper case (or clutch case) 19 is attached to a rear portion of the engine 3, and an output shaft 42 of the damper in the damper case 19 extends rearward and is provided at a front portion of the rear transmission case 5. Continuously variable transmission (HST for traveling)
22 input shafts. A rear transmission, a PTO transmission, and the like are housed in the rear transmission case 5.

A front transmission case 16 is disposed in front of the engine 3, and a hydraulic turning continuously variable transmission (hereinafter referred to as turning HST) 20 is attached to the front of the front transmission case 16. It is. The front transmission case 16 is supported by a front portion of the main frame 6 and is disposed at a front position of the fuselage. The turning HST 20 is driven by the power from the engine 3, and the output of the turning HST 20 and the output from the auxiliary transmission are combined to drive the driving sprocket 11.

Next, the arrangement of the silencer and the tail tube will be described. As shown in FIGS. 4 to 6, an exhaust manifold 61 is connected to an exhaust port of the engine 3, and a silencer 62 is connected to the exhaust manifold 61.
Are connected. The silencer 62 is formed in a substantially columnar shape, and is disposed with its axis centered in the front-rear direction. An exhaust pipe 63 is connected to the upper part of the silencer 62 at substantially the center on the left and right. The tail pipe 64 is connected to the end of the exhaust pipe 63. The exhaust pipe 63 and the tail pipe 64 are connected by fixing respective flanges provided by bolts or the like.

The hood 4 includes an upper cover and left and right side covers. The upper cover mainly constitutes the upper surface of the bonnet 4, and the left and right edges and side portions of the upper portion of the bonnet 4 are constituted by side covers. In the present embodiment, an opening is provided in a portion connecting the upper part and the side part of the hood 4, and the opening is formed in a side cover of the hood 4. Then, the tail pipe 64 is opened from the inside of the hood 4 through the opening.
Project out of the hood 4. The tail tube 64 extends upward from the hood 4 and is disposed at an upper corner inside the outermost portion of the hood 4. A heat shield plate 65 is provided at a portion of the tail pipe 4 protruding above the hood 4. Heat shield 65
Has a configuration in which a lower portion and a side portion are cut out so as to conform to the shape of the hood 4 at the position where the heat shield plate 65 is disposed. A plurality of openings are provided on the side surface of the heat shield plate 65.

Exhaust gas discharged from the engine 3 is directed upward from the hood 4 to an opening of a tail pipe 64 connected to the silencer 62. And it is discharged through the tail tube 64. The opening of the tail tube 64 is directed obliquely outward and forward of the fuselage. Accordingly, the bonnet 4 is not contaminated by the exhaust gas discharged from the tail pipe 64, and the exhaust gas does not wind up the straw or the fertilizer on the ground. Furthermore, no exhaust gas is directly applied to the crop. Further, since the tail pipe 64 is located at a position visible from the cabin 9, it is easy to recognize the state of the exhaust gas discharged from the tail pipe. Since the opening of the tail tube 64 is directed obliquely outward and forward of the fuselage, the exhaust gas is discharged on an extension of the line of sight, so that the exhaust gas can be viewed overlaid.
Thus, a slight change in the color of the exhaust gas can be amplified and recognized, and the state of the exhaust gas can be easily grasped. Therefore, it is easy to infer the state of the engine from the state of the exhaust gas.

As shown in FIG. 5, the tail pipe 64 is located inside the outermost end of the bonnet 4, and the tail pipe 64 is disposed in the heat shield plate 65. It is. As a result, the tail pipe 64 and the heat shield plate 65 fit within the lateral width of the bonnet 4, thereby simplifying the external shape and shortening the exhaust path including the exhaust pipe 63 and the tail pipe 64. Further, the weight of the tail tube 64 can be easily reduced, and the inertial force generated by the vibration of the tail tube 64 can be reduced. Therefore, the tail pipe 64 can be supported by a simple member, and the durability of the exhaust pipe 63 and the tail pipe 64 can be improved.
Since the tail pipe 64 hardly protrudes above the vehicle body, it can be easily put into a garage or the like.

A drain pipe 67 is provided below the silencer 62.
Are connected, and water is drained from the silencer 62 by the drain pipe 67. The upper end of the drain pipe 67 is located immediately below the lower end of the exhaust pipe 63 described above. As a result, rainwater or the like that has entered through the open end of the tail pipe 64 can be removed.
The water can be efficiently discharged to the outside of the discharge silencer 62 by the drain pipe 67. In other words, by positioning the drainage pipe 67 directly below the exhaust pipe 63, the time during which water is present in the silencer 62 can be shortened, and the durability of the silencer 62 can be improved.

Next, referring to FIG. 7 and FIG.
The arrangement of the heat shield plate 65 will be described. The heat shield plate 65 is a cover that covers the tail pipe 64, and serves to protect the tail pipe 64 and to protect an operator or the like from the tail pipe 64 that becomes hot. The heat shield plate 65 is configured to cover the side surface of the tail pipe 64, and the heat shield plate 65 has a configuration in which an inner portion of the fuselage is open. The heat shield plate 65 is mounted on the hood 4, and the lower portion of the heat shield plate 65 is formed in a shape along the upper surface and side surfaces of the bonnet 4. The hood 4 includes an upper cover 51 and a side cover 52, and the side cover 52 is provided with a notch 53. The notch 53 is formed up to the upper part of the side cover 52, and the upper part of the side cover 52 is cut out.

Concave portions are formed on the left and right edges of the upper cover 51, and the upper portion of the side cover 52 is bent downward in a front view. This allows
The upper part of the side cover 52 is fitted to the edge of the upper cover 51, and the upper part of the side cover 52 is held by the upper cover 52. It should be noted that the tail tube 64 is located in the notch 53 of the side cover 52. In this embodiment, the heat shield 65 is fixed to the side cover 52 of the hood 4. The heat shield plate 65 is fixed to the bonnet 4 via the stay 54. The heat shield plate 65 has a substantially C-shape in plan view, and has a configuration in which a portion of the heat shield plate 65 facing the inside of the body is open. By providing the opening on the side of the shielding plate 65, it is possible to avoid contact with the tail tube 64 when removing the shielding plate 65. Thus, the side cover 52 can be removed with the shielding plate 65 attached to the side cover 52.

A connecting portion 65b is fixed inside the shielding plate 65, and the stay 54 is fixed to the shielding plate 65 by the connecting portion 65b. And stay 54
Is fixed to the hood 4 so that the shielding plate 65 is mounted on the hood 4. Since the heat shield plate 65 is fixed to the hood 4, the heat shield plate 65 is not connected to the tail pipe 64. For this reason, the heat of the tail pipe 64 is
5, and the heat shield plate 65 is unlikely to reach a high temperature.

Further, the notch 53 provided in the hood 4 may be of a size that allows the tail pipe 64 to be arranged.
Further, the heat shield plate 65 serves as a guard for the hood 4 with respect to the tail pipe 64, and even when the tail pipe 64 vibrates, the heat shield plate 65 contacts the heat shield plate 65 to protect the bonnet 4. is there. Further, the notch 53 provided in the side cover of the hood 4 is hidden by the heat shield plate 65, so that the appearance can be improved.

Next, the effect of improving the visibility by adopting the tailpipe structure of the silencer of the present invention will be described with reference to FIGS. First, the improvement of the visibility in the vertical direction will be described with reference to FIG. The tail tube 64 is configured to protrude upward from the bonnet 4 and is arranged at an upper corner inside the outermost portion of the bonnet 4 and at the center of the bonnet 4. can do. For this reason, the tailpipe 64 is located near or below the line 72 connecting the eyes of the pilot 70 and the front end of the hood 4 seen from the pilot 70. Thereby, the blind spot generated by the tail tube 64 can be reduced, and the visibility of the pilot 70 can be improved. Furthermore, the tip of the crawler-type traveling device 1 can be easily recognized, and the periphery of the aircraft can be easily recognized by the operator.

Further, as shown in FIG. 10, since the opening of the tail pipe 64 is disposed obliquely forward, even when smoke 74 due to water vapor or the like is generated from the tail pipe 64, the smoke 74 blocks the tail. The area that can be reduced can be reduced.
The region where the field of view is blocked by the smoke 74 exhausted from the tail tube 64 is a region sandwiched by the lines 73. Line 7
3 is a line connecting the eyes of the pilot 70 and the end of the smoke 74. The tail pipe 64 exhausts air in a direction away from the pilot 70, and the smoke 74 discharged from the tail pipe 64 is discharged to the pilot 70 in a direction hidden by the shadow of the tail pipe 64. For this reason, the amount of the field of view blocked by the discharge of the smoke 74 can be reduced, and the field of view of the pilot 70 can be improved.

[0021]

According to the present invention, in a tail pipe structure of a silencer connected to an exhaust pipe for discharging exhaust gas of an engine, a tail pipe of the silencer is projected upward from a bonnet, and the silencer is provided. The tailpipe is located inside the upper and lower corners of the left and right outer ends of the bonnet, improving visibility ahead and shortening the distance from the silencer body to the tailpipe. The performance is improved. The cutout amount of the bonnet can be reduced, and the appearance improves.

According to the second aspect of the present invention, since the exhaust gas exhaust opening of the tail pipe is directed obliquely outward and forward, dirt on the bonnet can be prevented, and the visibility of the front can be improved. Further, the operator can easily recognize the state of the exhaust gas and infer the state of the engine from the state of the exhaust gas.

According to the third aspect of the present invention, since the cover covering the tail tube is attached to the bonnet, the tail tube and the cover are not connected, so that the heat shielding effect of the cover is improved. Further, the detachability of the hood is improved. Furthermore, the cutout portion of the hood is hidden and the appearance is improved.

[Brief description of the drawings]

FIG. 1 is a front perspective view of a crawler tractor.

FIG. 2 is an overall side view.

FIG. 3 is a side view showing an arrangement of an engine, an HST, and a transmission case.

FIG. 4 is a side view showing an arrangement configuration of a silencer and a tail tube.

FIG. 5 is a front view of the same.

FIG. 6 is a plan view of the same.

FIG. 7 is a perspective view showing an arrangement configuration of a shielding plate.

FIG. 8 is a diagram showing an assembly configuration of a heat shield plate.

FIG. 9 is a schematic diagram showing a state of visibility from the driver's seat as viewed from the side.

FIG. 10 is a schematic diagram showing a state of visibility from a driver's seat in plan view.

[Description of Signs] 4 Bonnet 61 Exhaust manifold 62 Silencer 63 Exhaust pipe 64 Tail pipe 65 Heat shield plate

Claims (3)

[Claims] In a tail pipe structure of a silencer connected to an exhaust pipe for discharging exhaust gas of an engine, a tail pipe of the silencer is projected upward from a bonnet, and the tail pipe of the silencer is moved to the left and right of the bonnet. The tailpipe structure of the silencer, which is located inside the outer end and at the upper corner. 2. A tail pipe structure for a silencer according to claim 1, wherein an exhaust gas exhaust opening of the tail pipe is directed obliquely outward and forward. 3. The tailpipe structure of a silencer according to claim 1, wherein a cover covering the tailpipe is attached to the bonnet.