JP2003002239A - Driving part structure of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute the driving part structure of a working vehicle to appropriately acquire structure for preventing the intrusion of engine sound into a cabin in the case of manufacturing a type with the cabin and a type without the cabin. SOLUTION: This driving part structure of the working vehicle is provided with a first cover 28 made of resin, for covering the rear side of a fuel tank and extending down to the floor 9 of the driving part and provided with an instrument part 34, and a second cover made of metal and arranged between the first cover 28 and the fuel tank 24, extending from the rear side of the fuel tank 24 down to the floor 9 of the driving part. The cabin is provided for covering the driving part while covering the first and second covers 28, 29. In the case of the type without the cabin, the first cover 28 is used, but the second cover 29 is not used.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to the structure of a driving unit in a working vehicle such as an agricultural tractor or a riding lawn mower. 2. Description of the Related Art In a working vehicle, for example, an agricultural tractor is provided with an engine at a front portion of a body thereof, a fuel tank is disposed at a rear side of the engine, and an operating section is formed at a rear side of the fuel tank. There is something. In this case, a resin cover that covers the rear side of the fuel tank and extends to the floor of the operation unit is provided, and an instrument unit is provided above the cover.
For the driver sitting on the driver's seat arranged behind the fuel tank in the driving section, the cover is arranged forward with the instrument section at the top, and the cover is made of resin so that the cover is (The cover is made of resin, so that it is easy to configure the cover as a cosmetic cover). [0003] It has been proposed that the working vehicle as described above has a cabin that covers a driving unit. When the cabin is provided in this way to cover the driving section, if the engine sound enters the cabin, the engine sound will be muffled inside the cabin. It is necessary to configure so as to prevent the above. The present invention relates to a driving unit structure of a working vehicle, when producing a working vehicle of a type having a cabin and a working vehicle of a type not having a cabin,
It is an object of the present invention to provide a structure for preventing engine noise from entering the interior of the cabin so that the structure can be appropriately obtained. According to a first aspect of the present invention, an engine is provided at a front portion of an airframe, a fuel tank is disposed at a rear side of the engine, and an operation is performed at a rear side of the fuel tank. In the case where the first part is formed, it covers the rear side of the fuel tank and extends to the floor of the operating part.
A cover, which extends from the rear side of the fuel tank to the floor of the operating section, includes a second metal cover disposed between the first cover and the fuel tank, and operates while covering the first and second covers; A cabin is provided to cover the part. According to a feature of the first aspect, in the case of a work vehicle of a type having a cabin, the work vehicle is provided with first and second covers,
A cabin that covers the driving unit while covering the first and second covers is provided. With such a configuration, the engine sound reaches the second cover from the fuel tank, and then reaches the first cover and attempts to enter the interior of the cabin. According to the feature of the first aspect, the engine sound first reaches the second cover from the fuel tank. However, since the second cover is made of a heavy metal, the engine sound is easily cut off by the second cover (generally, the weight is heavy). The higher the number, the higher the sound insulation effect). Since the first cover is arranged outside the cabin (the cabin side), even if the engine sound passes through the second cover, it is likely to be cut off at the first cover. According to the first aspect of the present invention, since the first cover is made of a resin, the first cover can be easily formed into an arbitrary shape suitable for the driving section (the first cover is made of resin). This makes it easy to configure the first cover as a cosmetic cover). In this case, the second cover is made of metal and is difficult to use as a cosmetic cover. However, since the second cover is located inside the first cover and is hidden, the second cover is used as a cosmetic cover. There is no need to configure the cover. [0007] According to the feature of the first aspect, in the case of a working vehicle of a type having no cabin, the first cover may be used and the second cover may not be used. In a working vehicle of the type without a cabin, the engine sound is diffused and there is no possibility that the engine sound is muffled near the driving section, so that it is not necessary to provide the second cover. Since the first cover made of resin is used as in the case of a work vehicle having a cabin, the first cover can be easily configured as a cosmetic cover. As shown in FIG. 1, an engine 3 is provided at a front portion of a body supported by right and left front wheels 1 and right and left rear wheels 2, and a rear portion of the body is provided. Mission case 4
And a driving unit 5 (driving seat 7) to constitute an agricultural tractor as an example of a work vehicle. 3 and 4
As shown in FIG. 2, the engine 3 is arranged at the front of the body, and the clutch housing 18 is connected to the rear of the engine 3. The base of the arch-shaped support frame 46 in a front view is
It is connected to the right and left sides of the clutch housing 18. As shown in FIGS. 3 and 4, a fuel tank 24 made of resin is provided. An upper portion of the fuel tank 24 is connected to a support frame 46, and a lower portion of the fuel tank 24 is connected to a bracket 46a of the support frame 46. Are linked. As shown in FIG. 3, in a side view, the front half of the fuel tank 24 enters the front side (the engine 3 side) beyond the support frame 46, and the rear half of the fuel tank 24 fits the support frame 46.
And goes into the rear side (driving unit 5 side). A metal partition 25 that partitions the engine 3 and the fuel tank 24 is connected to the support frame 46. As shown in FIGS. 1 and 3, a bonnet 26 that covers the engine 3 is provided, and around a horizontal axis P3 at an upper portion of the support frame 46,
A hood 26 is supported so as to be openable and closable. As shown in FIGS. 1 and 2, the cabin 8
The right and left front vertical frames 10, the right and left middle vertical frames 12, the right and left rear vertical frames 13, the first right and left front vertical frames 10 connected by welding over the upper end portions thereof.
Right and left joined by welding across the horizontal frame 14, the upper end of the right and left front vertical frame 10, the upper end of the right and left middle vertical frame 12, and the upper end of the right and left rear vertical frame 13 The second horizontal frame 15, the third horizontal frame 16, which is connected by welding over the upper ends of the right and left rear vertical frames 13, the lower ends of the right and left front vertical frames 10,
The right and left lower frames 11, the arched frame 19, and the inverted L in side view that are connected by welding over the lower ends of the right and left middle vertical frames 12 and the lower ends of the right and left rear vertical frames 13. With the character-like frame 27 and the like as main components,
The whole is composed. As shown in FIG. 1, a transparent front glass 17 is fixed to the right and left front vertical frames 10, the first horizontal frame 14, and the frame 19 via seal members. Right and left doors 20 made of transparent glass and provided with a seal member on the outer peripheral portion are supported via hinge members 21 so as to be freely opened and closed around a vertical axis P1 of the right and left middle vertical frames 12. A transparent rear glass 23 is supported between the right and left rear vertical frames 13 and the third horizontal frame 16 so as to be openable and closable about a horizontal axis at an upper portion of the third horizontal frame 16. Between the right and left middle vertical frames 12 and the right and left rear vertical frames 13, transparent right and left side glasses 22 are supported openably and closably about a vertical axis P2 of the right and left rear vertical frames 13. ing. A ceiling part 30 made of resin and blow-molded is attached to the first, second, and third horizontal frames 14, 15, and 16. When the cabin 8 is mounted on the fuselage, the cabin 8 is completed in advance as described above, and when the first cover 28 and the second cover 29, which will be described later, are not mounted, the cabin 8 is lifted with respect to the fuselage by a crane or the like. 1 and 3, the cabin 8 is connected to the fuselage (the floor 9, the right and left rear wheel fenders 31) so as to cover the driving unit 5 as shown in FIGS. As shown in FIGS. 3 and 5, a second cover 29 made of metal (made of sheet metal) is prepared. After connecting the cabin 8 to the body as described above, the second cover 29 is attached. The second cover 29 extends to the floor 9 and the clutch housing 18 while covering the upper, rear, right and left sides of the rear half of the fuel tank 24, and is located behind the rear half of the fuel tank 24. An opening 29a is formed in the second cover 29. A box-shaped support member 32 made of metal is attached to an upper portion of the second cover 29, and a motor 33 that drives a wiper 36 of the windshield 17 is attached to the support member 32. In this case, a sound absorbing material (not shown) may be attached to a surface of the second cover 29 on the driving unit 5 side (right side in FIG. 3). As shown in FIGS. 1, 3, and 5, a first resin
A cover 28 is prepared. After attaching the second cover 29 as described above, the first cover 28 is attached to the outside of the second cover 29. The first cover 28 is a second cover 29
Similarly, the fuel tank 24 extends to the floor 9 and the clutch housing 18 while covering the upper, rear, right and left lateral sides of the rear half of the fuel tank 24, and the support member 32. An instrument section 34 is provided above the first cover 28, and an opening 28 a is formed in a portion of the second cover 29 facing the opening 29 a. The meter section 34 includes a tachometer (not shown) for displaying the number of revolutions of the engine 3, a fuel gauge (not shown) for displaying the remaining amount of the fuel tank 24, various display lamps and warning lamps (not shown), and the like. It is prepared for. As shown in FIGS. 1, 3, and 5, first and second
The bracket 35 is attached to the frame 27 through the openings 28a and 29a of the covers 28 and 29. A support post 37 that supports a steering shaft (not shown) of the steering handle 6 is supported around the horizontal axis P4 of the bracket 35 so as to be able to change the angle, whereby the angle of the steering handle 6 can be changed. . As described above, in the case of the type having no cabin 8, the second cover 2
The frame 27 is mounted over the support frame 46 and the clutch housing 18 without mounting the first cover 9, and only the first cover 28 is mounted. In the case of the model without the cabin 8, the wiper 36, the support member 32 and the motor 33 shown in FIG. 3 become unnecessary, so the first cover 28 having no portion for covering the support member 32 is used. As shown in FIG. 1, an auxiliary step 38 is provided at the right and left ends of the floor 9 so as to be retractable.
As shown in FIG. 6, the auxiliary step 38 is formed by bending a plate material into a U-shape, and has a linear first guide slot 38.
a and a second guide slot 38b whose upper side is slightly curved in an arc shape
Is formed, and a stopper portion 38c is formed on the upper portion. A fixed first rod 39 and a vertically movable spring 41
Is provided on the floor 9, and the first and second rods 39 and 40 are inserted into the first and second guide slots 38 a and 38 b of the auxiliary step 38. . The state shown in FIG.
8 is the stored state. As shown in FIG. 9, an engaging portion 38d is provided around the horizontal axis P5 at the front end of the auxiliary step 38, and the engaging portion 38d of the auxiliary step 38 is engaged with the locking portion 9a of the floor 9. The auxiliary step 38
Can be held in the stored state. From the storage state shown in FIG. 7A, the auxiliary step 38 is extracted as shown in FIGS. 7B and 7C, and the auxiliary step 38 is set to the use state as shown in FIGS. In the use state shown in FIGS. 6 and 8, the second rod 40 enters the end of the second guide slot 38b of the auxiliary step 38, and the auxiliary step 38 is held. The load applied to the auxiliary step 38 is supported by the first rod 39, and the downward swing of the auxiliary step 38 around the first rod 39 requires that the stopper 38 c of the auxiliary step 38 abuts on the floor 9. Stopped by. As shown in FIGS. 8 to 7 (c), (b) and (b), when the auxiliary step 38 is operated in the retracted state, when the auxiliary step 38 is lifted around the first rod 39,
Since the second rod 40 is pushed down by the cam action of the second guide elongated hole 38b of the auxiliary step 38, the auxiliary step 38 is lifted to a substantially horizontal posture and pushed into the floor 9, and the engaging portion 38d of the auxiliary step 38 Is engaged with the locking portion 9 a of the floor 9, whereby the auxiliary step 3
8 is set to the storage state. By setting the auxiliary step 38 to the storage state, the auxiliary step 38 does not hit the ridge or the like when the vehicle crosses the ridge or the like. [Another Embodiment of the Invention] Instead of the structure of the auxiliary step 38 shown in FIGS. 6 to 9, FIGS.
(A) It may be configured as shown in (B). As shown in FIG. 10, the auxiliary step 38 includes first and second guide slots 38a, 38b and a stopper 38c similar to those in FIG. It is inserted into the first and second guide slots 38a, 38b. A motor 43 and a winding device 4 are provided below the floor 9.
4 and a spring 47 for connecting the wire 45 across the winding device 44 and the auxiliary step 38 to urge the auxiliary step 38 to a use state. Thus, the auxiliary step 38 can be operated to the use state and the storage state by winding and unwinding the wire 45 by the motor 43 and the winding device 44. In this case, by operating a switch (not shown) provided in the operation unit 5, the motor 43 and the winding device 44 are operated, and the auxiliary step 38 can be operated in the use state and the storage state. May be configured. When the aircraft is running, the auxiliary step 38 is automatically operated to be in the retracted state.
8 may be automatically operated to the use state. According to the first aspect of the present invention, in the operating part structure of the working vehicle, the operating part of the working vehicle covers the rear side of the fuel tank and extends to the floor of the operating part. A first cover, which extends from the rear side of the fuel tank to the floor of the driving section and has a second metal cover disposed between the first cover and the fuel tank, thereby providing a cabin type. In the case of the work vehicle, while the first cover is configured as a cosmetic cover, the second and first covers can prevent the engine sound from entering the interior of the cabin, and the work vehicle Comfort could be improved. According to the feature of the first aspect, in the case of a working vehicle of a type not equipped with a cabin, an increase in production cost is suppressed by not using the second cover while forming the first cover as a cosmetic cover. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side view of an agricultural tractor. FIG. 2 is an overall perspective view showing the structure of a cabin. FIG. 3 is a longitudinal side view showing the vicinity of a support frame and a fuel tank. FIG. 5 is a cross-sectional plan view of the vicinity of the support frame and the fuel tank. FIG. 6 is a perspective view of the vicinity of the auxiliary step in the use state. FIG. 7 is operated in the storage state and the use state of the auxiliary step. FIG. 8 is a vertical front view showing a state where the auxiliary step is operated in a use state. FIG. 9 is a vertical front view showing a vicinity of an engaging portion of the auxiliary step. FIG. 10 is an auxiliary view showing another embodiment of the invention. FIG. 11 is a perspective view of the vicinity of the step. FIG. 11 is a longitudinal sectional front view when the auxiliary step in another embodiment of the present invention is operated in the retracted state and the used state [Description of References] 3 Engine 5 Operating section 8 Cabin 9 Floor 24 Fuel tank 28 First cover 29 Second cover 34 Instrument section

Claims (1)

Claims 1. An operating part structure of a working vehicle including an engine at a front part of an airframe, a fuel tank disposed at a rear side of the engine, and an operating part at a rear side of the fuel tank. A first cover made of resin, which covers the rear side of the fuel tank and extends to the floor of the operating unit and has an instrument unit at an upper part thereof; and a floor of the operating unit from the rear side of the fuel tank. A second cover made of metal and disposed between the first cover and the fuel tank, and a cabin that covers the operating unit while covering the first and second covers. The driving unit structure of a working vehicle.