JPS6231518A - Exhaust device for farm tractor - Google Patents

Abstract

PURPOSE:To aim at improvements in safety and the setting properties of a front loader, by suspending an exhaust pipe downward in a bonnet side plate, and installing it extendedly as far as an exhaust muffler in the rear of a transmission case. CONSTITUTION:A bracket 3a for setting an ordinary exhaust muffler 1' and a downward bracket 3b for a fruit farm both are installed in and exhaust mainfold 3. And, in the case where an exhaust muffler 1 is set up at the side of a transmission case, an exhaust pipe 2 is installed interposingly between the exhaust manifold 3 and the exhaust muffler 1. This exhaust pipe 2 is hangingly installed sidewise along the side of an engine from the manifold 3, having it suspended down to a front end of a clutch housing, and it gets beneath a slap after passing a side plate 5L of a bonnet 5. With this constitu tion, an exposed part of the exhaust pipe is reduced whereby danger of a burn is kept back and, what is more, it can be made so as to get out of the way at the time of setting a front loader or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an arrangement structure of an exhaust muffler device in an agricultural tractor or the like that works while traveling in an orchard.

(b) Prior art Conventionally, in order to prevent the exhaust muffler that protrudes upward from coming into contact with the lower branches of fruit trees while driving in an orchard, etc., an exhaust pipe is extended downward and the exhaust muffler is installed on the side of the transmission case. It is said that the arrangement is publicly known. For example, Utility Model Application Publication No. 55-157025 and Utility Model Application No. 56-8
This is as in Publication No. 4423.

(c) Problems to be Solved by the Invention An object of the present invention is to solve the problem that the conventional downwardly arranged exhaust muffler device had the exhaust pipe protruding outward through a hole in the side plate of the bonnet. There was a risk of burns, and the protruding exhaust pipe was an obstacle when attaching a front loader or the like to a tractor. In the present invention, the exhaust pipe is arranged inside the side plate of the bonnet to improve safety, and by arranging the exhaust pipe, the width of the bonnet can be increased, and the exhaust pipe itself can be connected to the bracket of the front loader. The exhaust pipe is flat and has a constricted part so that it does not overlap.

(d) Means for Solving the Problems The objects of the present invention are as described above. Next, the configuration for achieving the objects will be explained.

In a configuration in which exhaust gas from an engine placed in the hood of an agricultural tractor is guided from an exhaust manifold attached to a cylinder head to an exhaust muffler via an exhaust pipe,
The exhaust pipe hangs downward within the side panel of the hood and extends to the exhaust muffler behind the transmission case.

Further, in the exhaust pipe, a constricted portion having a flat cross section is formed in the exhaust pipe near the side plate of the bonnet, and the longitudinal direction of the flat shape is arranged in the longitudinal direction of the aircraft body.

(e) Embodiments and Functions The objects and structure of the present invention are as described above. Next, the structure of the embodiments shown in the attached drawings and the invention will be explained in detail.

FIG. 1 is a side view showing the arrangement of the exhaust system of the present invention, FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a sectional view showing the constricted portion of the exhaust pipe.

Bonnet 5 placed in front of the driver's seat of an agricultural tractor
are the bonnet top plate 5a and the left and right bonnet side plates 5L and 5.
It is composed of R. An engine E is disposed within the bonnet 5. A clutch housing 6 is fixed to the rear surface of the engine E, and a transmission case 7 is further fixed to the rear surface of the clutch housing 6. A rear axle housing 7a is provided to project from the side surface of the transmission case 7 to the left and right, and the rear axle housing 7a supports a rear axle.

The exhaust system of the present invention is a cylinder head 4 of the engine E.
The exhaust gas discharged from the engine is discharged through an exhaust manifold 3, an exhaust pipe 2, and an exhaust muffler 1 to a position where it does not interfere with the operator.

In the case of ordinary agricultural tractors, since the work is carried out in paddy fields, fields, etc., there is no problem even if the exhaust muffler 1 protrudes above the bonnet. 1 is placed. However, in the case of a tractor used in the present invention, which works in an orchard, etc., the exhaust muffler 1 that protrudes upward comes into contact with the lower branches of fruit trees, so the exhaust muffler 1 is placed low and in a position where it does not get in the way of the operator. It is necessary to place it in

In the case of the present invention, both the platen l-38 for attaching to the exhaust manifold 3 at the position of the normal exhaust muffler 1'' and the downward bracket 3b for orchard are configured so that they face different directions. In particular,
In this embodiment, both brackets 3a and 3b are oriented in 90 degrees different directions. The exhaust muffler 1 is configured so that it can be attached to either.

When the exhaust muffler 1 is disposed on the side of the transmission case 7 for an orchard tractor, the exhaust pipe 2 is interposed between the exhaust manifold 3 and the exhaust muffler 1. The exhaust pipe 2, as shown in FIG.
It is installed vertically from the exhaust manifold 3 toward the side along the side of the engine E, hangs down to around the front end of the clutch housing 6, passes through the left side plate 5L of the bonnet 5,
It is configured to dive below the steps.

In addition, a hydraulic pump device 13, an oil feed pipe 17, etc. are also arranged on the side of the engine E, and the piping of the exhaust pipe 2 is also subject to restrictions.

Also, the bracket mounting seat 10/1 of the clutch housing 6
Since the front loader mounting bracket is fixed to 1, the exhaust pipe 2 cannot close these bracket mounting seats 10 and 11, and is located above the bracket mounting seat 11, avoiding the bracket mounting seat 10. It is placed in the correct position.

Furthermore, it is impossible to expand the bonnet 5 in the width direction because it may come into contact with the base of the front loader. The expansion of the bonnet 5 in the width □ direction is suppressed by constricting it to form the constricted portion 2a.

In addition, the model in which the exhaust muffler 1 is arranged downward as in the present invention is a special specification vehicle, and preparing the bonnet 5 only for the special specification vehicle causes high costs. By narrowing it down and matching it with the bonnet 5, it is possible to prevent high costs.

Further, when the exhaust pipe 2 widens the width of the bonnet 5, the operator's visibility to the front and downward becomes poor, but this problem can also be improved by configuring the vehicle as in the present invention.

The front end of the exhaust pipe 2 is fixed to the exhaust manifold 3, and the rear end is supported by a bracket 8 provided on the side surface of the transmission case 7. The front end of the exhaust muffler 1 is fixed to the rear end of the exhaust pipe 2, and the rear end is fixed to a bracket 9 protruding from the rear axle housing 7a.

As shown in FIG. 2, a step support 15 projects laterally from the clutch housing 6, and a line filter 16 is disposed below the step support 15. Also, an oil feed vibrator 17 is installed inside the line filter 16.
is arranged, and the exhaust pipe 2 of the present invention is arranged outside the line filter 16.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

First, the exhaust pipe is made to hang downward within the side panel of the bonnet and extends to the exhaust muffler behind the transmission case, which reduces the number of bends in the exhaust pipe 2 and reduces exhaust resistance compared to conventional technology. lowered, exhaust pipe 2 and bonnet 5
This made it possible to suppress the rise in internal temperature.

Second, since the exhaust pipe 2 is vertically installed downward, it does not engage with the bracket mounting seats 10 and 11 for the front loader mounting bracket, so it does not get in the way of mounting the front loader. This made the work easier.

Thirdly, the exhaust pipe near the side plate of the bonnet has a convergent section with a flat cross section, and the flat longitudinal direction is arranged in the longitudinal direction of the aircraft, so that when the exhaust pipe 2 passes through, the bonnet 5 There is no need to increase the width, and there is no need to prepare a separate bonnet 5 for an orchard specification tractor, and a standard type bonnet 5 can be used.

Fourth, since the width of the bonnet 5 does not increase, the front loader can be easily attached, and visibility to the front and downward can be secured.

Fifth, by providing the throttle bracket (2a) on the exhaust pipe 2, the hot air from the radiator fan does not stay inside the bonnet 5, but flows smoothly, and the temperature rise inside the bonnet 5 is suppressed.

Sixthly, the exhaust from the exhaust manifold 3 is
Since the exhaust gas is once narrowed down, the pulsation of the exhaust gas is suppressed, and the deterioration of exhaust performance due to pulsation within the pipe is suppressed.

[Brief explanation of drawings]

FIG. 1 is a side view showing the arrangement of the exhaust system of the present invention, FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a sectional view showing the constricted portion of the exhaust pipe. E... Engine... Exhaust muffler 2... Exhaust pipe 2a... Throttle section 3... Exhaust manifold 5... Bonnet 5L... Bonnet side plate 7... Mission case

Claims (2)

[Claims] (1) In a configuration in which the exhaust from the engine placed in the hood of an agricultural tractor is guided from the exhaust manifold attached to the cylinder head to the exhaust muffler via the exhaust pipe, the exhaust pipe is suspended downward within the side panel of the bonnet. , an agricultural tractor exhaust system characterized by extending to the exhaust muffler behind the transmission case. (2) In the exhaust pipe according to claim 1,
1. An exhaust system for an agricultural tractor, characterized in that an exhaust pipe in the vicinity of a side plate of a bonnet is provided with a constriction portion having a flat cross section, and the longitudinal direction of the flat shape is arranged in the longitudinal direction of the machine body.