JP2020159255A - Work vehicle - Google Patents

Abstract

To provide a work vehicle which enables a vertically long tail pipe to be stably attached to a side of an engine hood.SOLUTION: A work vehicle includes an engine 4 and an engine hood 15 which covers the engine 4. In the work vehicle, a vertical pipe part 20 of a tail pipe 18 is erected at a side of the engine hood 15 in a vertical direction to exhaust air to an area above the engine hood. Further, a tail pipe support member S2 supporting the vertical pipe part 20 of the tail pipe 18 is fixed to a support member 28 attached to an area closer to a rear part of the engine 4, and the tail pipe support member S2 is connected to the vertical pipe part 20 to support the vertical pipe part 20 above an attachment position attached to the support member 28.SELECTED DRAWING: Figure 2

Description

The present invention relates to a work vehicle such as an agricultural tractor, and particularly to a tail pipe support configuration of a muffler.

In a work vehicle in which the tail pipe connected to the engine muffler is vertically long and arranged on the side of the bonnet and the exhaust is discharged to the atmosphere above the bonnet, the bonnet is used to support the work machine attached to the front side of the vehicle. A work vehicle in which a tail pipe is fixed to a brace erected on the side of the vehicle to suppress vibration is known. (Prior Document 1).

Japanese Unexamined Patent Publication No. 2008-273367

However, in a work vehicle that does not have a support and fixing member such as a brace on the side of the bonnet, there is a problem in suppressing vibration when a tail pipe having a length for exhausting above the bonnet is attached.

An object of the present invention is to provide a work vehicle in which a vertically long tail pipe can be stably attached to the side of a bonnet.

The present invention has taken the following technical measures to solve the above problems.

The invention according to claim 1 is a work vehicle including an engine 4 and a bonnet 15 covering the engine 4, in which a vertical pipe portion 20 of a tail pipe 18 is erected vertically on the side of the bonnet 15 and exhausted above the bonnet. In, the tail pipe support member S2 that supports the vertical pipe portion 20 of the tail pipe 18 is fixed to the support member 28 attached to the rear portion of the engine 4, and the tail pipe support member S2 is above the attachment position with the support member 28. The vertical pipe portion 20 was connected and supported by the above.

The invention according to claim 2 is the invention according to claim 1, wherein the tail pipe 18 is connected to a base end side pipe part 19 connected to the muffler main body 16 and a vertical pipe part 20 connected to the base end side pipe part 19. The base end side pipe portion 19 is formed into a substantially U shape by the downward extending portion 19a and the standing portion 19b.

The invention according to claim 3 is a tail pipe support including a relay support plate 25, a vehicle body side support arm 24 connected to the relay support plate 25, and an engine 4 side support rod 26 in the invention according to claim 2. The base end side pipe portion 19 is supported by the member S1.

According to the invention of claim 1, the vertical pipe portion 20 of the tail pipe 18 is supported by the tail pipe supporting member S2, but since it is supported at a high position, it can be stably supported. ..

The invention according to claim 2, in addition to the effect according to claim 1, has a high-altitude exhaust specification and a vertical pipe portion 20 in which the vertical pipe portion 20 is connected to the base end side pipe portion 19 formed in a substantially U shape. The specifications can be changed to the low-altitude exhaust specifications with the removed.

According to the invention of claim 3, in addition to the effect of claim 2, the base end side pipe portion 19 of the tail pipe 18 is formed into a substantially U shape, but is supported by the tail pipe support member S1. Because it is stable.

It is a side view of an agricultural tractor. It is a side view of a tail pipe and a support structure. It is a top view of a tail pipe and a support structure. It is a front view of a tail pipe and a support structure. It is a rear view of a tail pipe and a support structure.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

Agricultural tractors as work vehicles work in fields or the like while self-propelled by power. Agricultural tractors include left and right front wheels 2L and 2R that are on the front side of the vehicle body 1 and can be driven and steered, left and right rear wheels 3L and 3R mounted on the rear side of the body 1, and an engine 4 as a power source. A transmission case 5 in which a transmission is installed is provided. In the pair of left and right members, the reference numeral L in the figure indicates the left side, and the symbol R indicates the right side.

Further, a connecting device 7 to which a working machine 6 such as a rotary can be mounted is arranged at the rear of the vehicle body 1. The connecting device 7 is a three-point link composed of a top link 7a at the upper center and lower links 7b and 7b at the lower left and right. By hydraulically rotating the lift arm 8, the lower links 9 and 9 are used. It is configured to rotate 7b and move the working machine 6 up and down.

In the agricultural tractor, the steering handle 13 is erected from the dashboard 12 on the front side of the vehicle body driver's seat 10, and various operation pedals such as a clutch pedal, a brake pedal, an accelerator pedal, a forward / backward lever, and a shift are performed around the driver's seat 10. Various operation levers such as levers are arranged.

A transmission mechanism is arranged in the mission case 5, and power from the engine 4 is transmitted to the rear wheels 3L, 3R and the front wheels 2L, 2R via a known forward / backward switching mechanism, main transmission mechanism, and auxiliary transmission mechanism. It is configured to be.

In the bonnet 15, the muffler main body 16 connected to the engine 4 is arranged on one left and right side (left side in the figure) of the engine 4, and the exhaust introduced connected to the exhaust part of the engine 4 at the lower rear side of the muffler main body 16. A pipe 17 is connected, and a tail pipe 18 is connected to the lower part on the front side.

The tail pipe 18 includes a base end side pipe portion 19 connected to the muffler main body 16 and a vertical pipe portion 20 connected to the base end side pipe portion 19. The base end side pipe portion 19 is connected to the exhaust side connecting cylinder 16a of the muffler main body 16 and extends downward, and the downward extending portion 19a formed into an L shape so as to have a horizontal portion facing backward, and the downward extending portion 19a. It is composed of an upright portion 19b formed by connecting a predetermined horizontal portion to the rear end of the protruding portion 19a at a predetermined angle outward and further erecting the end portion. It is molded into a U shape. Therefore, the base end side pipe portion 19 has a configuration in which the downward extending portion 19a bypasses the lower edge of the side cover 19L of the bonnet 19, and the standing portion 19b is arranged on the side of the bonnet 19.

The vertical pipe portion 20 is connected to the upright portion 19b of the base end side pipe portion 19, the upper portion is gradually curved, and the upper end thereof is opened diagonally forward of the vehicle body.

Pipe covers 21 and 22 are provided on the base end side pipe portion 19 and the vertical pipe portion 20 constituting the tail pipe 18, respectively. These are constructed by molding punching metal into a U shape.

Next, the support configuration of the tail pipe 18 will be described. First, in the base end side pipe portion 19 constituting the tail pipe 18, a support arm 24 having a lower end side bolted to the vehicle body frame 23 that also serves as an axle bracket is provided so as to extend upward, and a relay support plate 25 is welded to the upper end thereof. Connecting. The relay support plate 25 is configured to be bolted to the outer end of the horizontal portion of the L-shaped support rod 26 appropriately connected to the side surface of the engine 4 via a plate or the like, and is a first tail pipe together with the support arm 24. The support member S1 is formed. A band plate 27 that welds and connects the downward extending portion 19a of the base end side pipe portion 19 to the outer surface of the relay support plate 25 and fastens and connects the pipe cover 21 that covers the horizontal portion of the base end side pipe portion 19 at the center. Are polymerized and bolted together.

Next, regarding the support configuration of the vertical pipe portion 20, the vertical pipe portion 20 is supported via the relay rod 29 on the support frame 28 whose lower side is connected to the vehicle body frame 23 or the rear portion of the engine 4. Specifically, the base plate 30 at the lower end of the relay rod 29 is bolted to the support frame 28 having a U-shaped cross section to connect to the support frame 28. The relay rod 29 includes a horizontal portion 29a extending outward and an inclined portion 29b inclined diagonally upward to form a second tail pipe support member S2, and a relay plate 31 is provided at the upper end of the inclined portion 29b. The pipe connecting arm 32 welded and connected to surround the half circumference of the vertical pipe portion 20 is superposed and bolted. The pipe cover 22 is sandwiched between the relay plate 31 and the pipe rolling arm 32 and fastened.

The pipe cover 22 is formed to be long enough to cover the vertical pipe portion 20 and the upright portion 19b of the base end side pipe portion 19, but has a U-shaped cross section and is configured so that the surface facing the vehicle body 1 is open and vertically. Is provided with a connecting small piece 33 for reinforcement. The connecting small piece 33 has a function of connecting and reinforcing the facing surfaces on the open side and forming a notch along the outer circumference of the vertical pipe portion 20 to position the pipe cover 22 with respect to the vertical pipe portion 20.

As described above, of the tail pipe 18, the base end side pipe portion 19 is formed into a substantially U shape by the downward extending portion 19a and the standing portion 19b, but is supported by the first tail pipe supporting member S1. It will be stable because it will be done.

Further, the upright portion 19b and the vertical pipe portion 20 of the base end side pipe portion 19 are supported by the second tail pipe support member S2, but the relay rod 29 has an inclined portion 29b and is supported at a high position. Because it does, it can be supported stably. In particular, the connecting height of the pipe connecting arm 32 and the relay rod 29 as the second tail pipe supporting member S2 can be set to a position higher than the height of the connecting portion between the support frame 28 and the relay rod 29, and the vertical pipe portion 20 can be set. Can be supported stably and vibration can be suppressed.

A fuel tank support bracket 34 is formed above the support frame 28 that constitutes the second tail pipe support member S2.

The vertical pipe portion 20 is formed to have the same diameter in the upright portion 19b of the base end side pipe portion 19 and is connected by the band member 35, but the two may be separated and the outside air may be introduced by utilizing the so-called ejector effect. Good. Further, when the vertical pipe portion 19 is provided, the exhaust is performed at a relatively high place, but it is easy to change the specification to exhaust directly from the base end side pipe portion 19.

4 Engine 15 Bonnet 18 Tail pipe 19 Base end side pipe 19a Downward extension 19b Standing 20 Vertical pipe 24 Support arm (first tail pipe support member)
25 Relay support plate (first tail pipe support member)
26 L-shaped support rod (first tail pipe support member)
28 Support frame (support member)
29 Relay rod (second tail pipe support member)
30 Base plate (second tail pipe support member)
S1 1st tail pipe support member S2 2nd tail pipe support member

Claims (3)

The engine (4) and the bonnet (15) covering the engine (4) are provided, and the vertical pipe portion (20) of the tail pipe (18) is erected on the side of the bonnet (15) in the vertical direction. (15) In a work vehicle that exhausts upward, a support member (S2) that supports the vertical pipe portion (20) of the tail pipe (18) is attached to the rear portion of the engine (4). A work vehicle characterized in that the tail pipe support member (S2) is fixed to 28) and the vertical pipe portion (20) is connected and supported above the mounting position with the support member (28). The tail pipe (18) includes a base end side pipe portion (19) connected to the muffler main body (16) and the vertical pipe portion (20) connected to the base end side pipe portion (19). The work vehicle according to claim 1, wherein the base end side pipe portion (19) is formed into a substantially U shape by a downward extending portion (19a) and an upright portion (19b). The relay support plate (25), and the tail pipe support member (S1) composed of the vehicle body side support arm (24) connected to the relay support plate (25) and the engine (4) side support rod (26). The work vehicle according to claim 2, wherein the base end side pipe portion (19) is supported.

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