JP2003094960A - Traveling vehicle - Google Patents

Abstract

(57) [Problem] To provide a work vehicle in which a fuel tank is installed in a portion which is not near an engine, and even if fuel leaks from the fuel tank, a serious accident may not occur. A fuel tank (34) for an engine attached to the rear of a cockpit (19), the fuel tank (34) and the cockpit (19) are provided.
A front cover 45 of the fuel tank 34 is detachably attached to the rear surface of the fuel tank 34, and stays 38, 39 are welded to the bottom surface of the fuel tank 34 and the lateral width direction of the rear surface. Are supported by reinforcing members (vertical columns 42, horizontal columns 43) on both sides of the cockpit 19 to prevent deformation and reinforcement of the fuel tank 34 made of a thin plate, and a fuel tank front cover 45 is provided on the back of the cockpit 19. Place the cover 45
, The fuel tank 34 can be easily attached and detached.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a work vehicle for transportation and the like, and particularly to a fuel tank mounting portion thereof. 2. Description of the Related Art A tractor will be described as an example of the traveling vehicle. The tractor is equipped with a drive mechanism including a pair of front, rear, left and right wheels, an engine serving as a drive source of the wheels, a transmission for shifting the engine driving force, and the like, and a cockpit including a steering wheel is provided on the body. Work machines such as tillers can be connected to the rear of the vehicle. [0003] Conventionally, the fuel tank of the tractor is supported on the head of the engine via a tank stay or the like. However, in such a structure in which the fuel tank is mounted on the head of the engine, when the traveling road surface is in a bad condition or the like, cracks occur in the welded portion of the fuel tank due to the vibration of the engine. May cause fuel leakage. If fuel leaks above the engine, a serious accident may occur, and various inventions have been made to take measures to prevent such problems. [0005] It is an object of the present invention to provide a work vehicle in which a fuel tank is installed in a portion not near the engine, and even if fuel leaks from the fuel tank, a serious accident may not occur. SUMMARY OF THE INVENTION The object of the present invention is to provide a vehicle body 9, wheels 6 and 14 attached to the vehicle body 9, and to drive the wheels 6 and 14 also attached to the vehicle body 9. In a traveling vehicle including the engine 12 and a cockpit 19 provided on the vehicle body 9, a fuel tank 34 for an engine attached to a rear portion of the cockpit 19, the fuel tank 34 and the cockpit 1
A fuel tank 34 detachably attached to the back of the fuel tank 9
It is a traveling vehicle provided with the front cover 45 of FIG. According to the present invention, the stays 38, 39 are welded and connected in the width direction of the bottom surface and the back surface of the fuel tank 34, and both ends of the stays 38, 39 are connected to reinforcing members (vertical members) on both sides of the cockpit 19. Column 42, horizontal column 43). The stays 38 and 39 also function as deformation preventing and reinforcing members for the fuel tank 34 made of a thin plate. Cockpit 19
If the fuel tank front cover 45 is arranged on the back surface of the fuel tank 34, the fuel tank 34 can be easily attached and detached by removing the cover 45. According to the present invention, while reinforcing the fuel tank 34, the space at the back of the cockpit 19 can be effectively used, and the fuel tank 34 can be easily attached and detached. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a semi-crawler type agricultural tractor (hereinafter referred to as a tractor) as an example of a work vehicle. FIG. 1 shows a side view of a tractor according to an embodiment of the present invention. The tractor 10 has an engine 12 mounted inside a hood 11 at a front portion of the vehicle body 9, and a clutch housing (not shown), a transmission case 13 and the like are integrally connected to the engine 12 to form a main frame of the vehicle body 9. . And hood 1
A pair of wheel-type front wheels 14 are provided on the left and right sides of 1 so as to freely roll around the center pivot 15 center,
A steering post 16 is provided in the cabin 8 at the rear of the bonnet 11, and a steering handle 1
7 is provided so as to protrude, and the front wheel 14 is steered by rotating the steering handle 17. To explain the inside of the cabin 8 of the tractor 10, a speed change lever 20 for traveling and an elevating operation lever 21 for elevating the work implement are provided on the side of the cockpit 19. A potentiometer (not shown) for detecting the operation angle is provided at the rotation base of the lifting operation lever 21, and work is performed so that the operation angle of the lever matches the set angle of a lift arm 23 (see FIG. 6) described later. The height of the machine 24 is changed. The crawler-type traveling device 7 of the tractor 10 includes:
Rollers 4a, 4b, 4
c and crawler frame 5 supporting driven wheels 3F, 3R
The rolling wheels 4a, 4b, 4c and the driven wheels 3F, 3
The configuration is such that the crawler 6 is hung over R. Although not shown, the crawler frame 5 is a substantially "H" -shaped iron frame in a top view, and has a structure in which rolling support portions 5a provided in the front and rear directions are provided on both left and right sides. The front end of the wheel supporting portion 5a is
The rear end of the wheel supporting portion 5a is provided with a holding portion that rotatably supports the rear driven wheel 3R at the rear end thereof. The front end of the wheel supporting portion 5a is fitted by sliding the supporting portion of the front driven wheel 3F back and forth in the cylinder.
The front and rear position is adjustable. And, between these front and rear driven wheels 3F and 3R, the first rolling wheels 4 are sequentially arranged from the front.
a, the second wheel 4b, and the third wheel 4c are provided. The crawler drive wheels 2 are provided at the distal ends of a pair of drive shafts 1 projecting outward from left and right extending portions (not shown) at the rear of the transmission case 13. A large number of projections in the form of sprockets are provided so as to mesh with a large number of engagement holes (not shown) of the crawler 6, and the crawler 6 is driven by these meshes. Next, the transmission case 1 of the tractor 10
3 will be described with reference to FIG. At the rear of the transmission case 13, a three-point link mechanism including a top link 36 and left and right lower links 37, 37 is provided, to which the working machine 24 is connected. The three-point link mechanism is connected to the left and right lift arms 23, 23, respectively, and the work implement 24 is moved up and down by rotating the lift arm 23 up and down. FIG. 1 shows a configuration example in which rotary working machines are connected. As shown in the rear view of the tractor in FIG. 2, one of the features of this embodiment is that the fuel tank 34 of the tractor 10
On the back of the cockpit 19 and between the left and right crawlers 6,6. FIG. 3 is a side view of the fuel tank 34 itself.
FIG. 3 (a) shows a rear view of FIG. 3 (b). Stays 38 and 39 are connected by welding in the width direction of the bottom surface and the back surface of the fuel tank 34, and both ends of the stays 38 and 39 are vertically connected to the inner surface of a vertical column 42 which is a part of the rear support frame of the cabin 8. The upper and lower mounting plates 41a and 41b (FIG. 4), which are respectively provided by welding, are mounted with fasteners such as bolts and nuts. Upright wall surfaces of the left and right fenders 40, 40 are located on the outer surface side of the vertical column 42, respectively, and protect the left and right side surfaces of the fuel tank 34. The stays 38 and 39 also function as deformation preventing and reinforcing members for the fuel tank 34 made of a thin plate. As shown in FIG. 4 which is an enlarged side view of the cockpit 19, a large opening is provided in the rear upright wall of the cabin 8, and a fuel tank front cover 45 is disposed in the opening. By removing the cover 45, it is possible to work from inside and outside the room through the opening in the rear wall of the cabin 8, and the fuel tank 34 can be easily attached and detached. The conventional product does not have a removable cover 45 and has a vertical wall at the rear of the cabin 8 to separate the cabin 8 from the inside and outside. Therefore, when the fuel tank 34 is installed, the harnesses and connectors of the electrical components and the hoses and couplers of the hydraulic equipment disposed outside the cabin 8 are bent or sandwiched between the fuel tank 34 and the upright wall. It was difficult to secure or assemble. In this embodiment, the front cover 45, which is a lightweight material, is attached to the front of the fuel tank 34 to cover the fuel tank 34.
By simply removing the fuel cell 5, assembly and maintenance of the fuel tank 34 can be easily performed from the indoor side. The semi-crawler type tractor shown in FIG. 1 is provided with a rear working machine 24 as a standard specification, and an elevating operation lever 21 for lifting and lowering the rear working machine 24 is provided near the cockpit 19. In the conventional apparatus, as shown in the hydraulic circuit at the time of raising the working machine 24 in FIG. 5A, when the lifting operation lever 21 is pulled backward, the working machine 24 connected to the tractor 10 is moved up and down. A lift arm hydraulic cylinder 58 for moving the lift arm 23 upward is provided. The raising / lowering operation lever 21 includes a three-chamber switching valve having a neutral position, a raising position, and a lowering position. After the work implement 24 moves up or down to the target position, the work implement is moved to the target position by raising / lowering the operation lever 21 of FIG. It has returned to the neutral position shown in the hydraulic circuit diagram. This is because the internal pressure of the lift arm hydraulic cylinder 58 becomes full, and the internal pressure fluctuates when the pressure oil supplied from the pump returns to the oil tank 61 by opening the main relief valve 60, especially when left up. The main relief valve 60 is opened and closed to generate chattering noise and prevent the oil temperature from becoming hot. In the conventional apparatus shown in FIG. 5 for this purpose, although not particularly shown, when the lift arm 23 is raised to the uppermost position by a mechanical mechanism, the lifting operation lever 21 is forcibly returned to the neutral position, and FIG. The oil path of the hydraulic circuit shown in b) is configured.
Then, the oil passage leading to the lift arm hydraulic cylinder 58 is blocked to prevent the oil in the lift arm hydraulic cylinder 58 from escaping, thereby preventing the lift arm 23 from descending. And a mechanism for flowing down to the oil tank 61 via a return oil passage having no resistance. In the present invention, an oil passage is used which forcibly returns the lifting operation lever 21 to the neutral position when the lift arm 23 is raised to the highest position, which will be described with reference to FIG. FIG. 6 is a side view of an all-crawler tractor according to an embodiment of the present invention. Although all crawlers 51 shown in FIG. 6 can be provided with substantially the same drive mechanism as the semi-crawler 6 shown in FIG. 1 and a working machine (not shown) at the rear, another working machine is additionally mounted at the front of the machine body. They are different. A dozer 53 provided with a discharging blade 52 as a front working machine is provided at the front end of a main body frame 55 so as to be vertically movable at the front of the vehicle body of the all-crawler type tractor shown in FIG. 56 and the lift arm 5
6 is configured to move up and down by the expansion and contraction operation of the lift cylinder 57. Normally, such an additional front working machine is moved up and down using a lifting mechanism different from that of the rear working machine 24. In addition, the provision of a lifting lever neutral return mechanism (for example, as shown in FIG. 5B) in another lifting mechanism is a factor of cost increase, and it may not be folded. FIG. 8 shows a main part of a conventional structure for forcibly returning the elevating lever to the neutral side.
One end of the inner wire 100a is attached to the lift arm 56 for
And the other end of the inner wire 100a is attached to the elevating lever 21, so that the lift arm 56 of the dozer 53 moves upward and the inner wire 10a moves.
0a is to pull the other end side to forcibly return the elevating lever to the neutral side. However, in the configuration of the present embodiment shown in FIG. 6, the dozer lift cylinder 57 is operated by using the hydraulic circuit for operating the lift arm hydraulic cylinder 58 for the rear working machine 24 as shown in FIG. The switching valve 67 is provided in a hydraulic circuit below the elevating operation lever 21 to extend and retract the dozer 53 and to forcibly return the elevating lever to the neutral position when the dozer 53 is raised. 23 can be operated. That is, the pressure oil from the pump switched by the switching valve 67 is supplied to the dozer lift cylinder 57.
When the pressurized oil to the dozer lift cylinder 57 becomes full, the one-way safety valve 69 (the pressure oil flows into the lift arm hydraulic cylinder 58 for elevating and lowering the rear working machine 24). (Which operates at a lower oil pressure than the main relief valve 60) is provided in parallel with the switching valve 67. Therefore, when the dozer 53 reaches the maximum raising position, the safety valve 69 is operated and the oil supplied to the dozer lift cylinder 57 flows to the lift arm hydraulic cylinder 58. Therefore, a mechanical mechanism for returning the lifting operation lever 21 to the neutral position can be operated without the wire 100 having the conventional structure shown in FIG. A throttle valve 66 arranged in parallel with a one-way valve 65 for flowing oil only toward the outward path below the lifting operation lever 21 of the hydraulic circuit shown in FIG. Arranged for slow lowering. FIG. 9 is a side view of a tractor according to an embodiment of the present invention. As shown in FIG. 9, a cylindrical body 72 provided with a pin inside a rotation fulcrum 72a to which a brake arm 71 of a foot brake 70 is attached. A nipple 72b for grease-up is attached to the upper surface of the. FIG. 9 shows an example of a configuration in which the fuel tank 34 is arranged adjacent to the side of the transmission case. In order to increase the capacity of the fuel tank 34 and maintain the grease-up maintenance, the foot brake is required. A nipple 72b is provided on the outer peripheral surface of the cylindrical body 72 of the rotation fulcrum 72a of the brake arm 71 of FIG. Thus, when the rotation fulcrum 72a is greased, the floor 74 of the cabin 8 is greased.
A grease gun is inserted through the peep hole 74a. FIG. 10 is a partial view of the fuel tank 34 shown in FIG.
And, as shown in the plane view of the body of the fuel tank 34 in FIG.
4a is provided. A brake arm 71 is provided in the hollow cylinder portion 34a.
An extension rod 77 having a grease nipple 72b attached to an outer end thereof for grease-up of the rotation fulcrum 72a is disposed. An oil passage 77b is opened in the extension rod 77, and grease press-fitted with a grease gun lubricates the rotation fulcrum 72a through the oil passage 77b. When the fuel tank 34 is attached or detached to the side of the transmission case 13, the fuel tank is attached to an extension rod 77 projecting sideways from a rotation fulcrum 72 a for the brake arm 71 attached to the transmission case 13. 34
Can be easily mounted and removed by the operator alone.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a side view of a tractor according to an embodiment of the present invention. FIG. 2 is a rear view of the crawler traveling device of the tractor of FIG. 1; FIG. 3 is a side view of the fuel tank of the tractor shown in FIG. 1 (FIG. 3);
(A)) and a rear view (FIG. 3 (b)). FIG. 4 is a side view of a rear part of a cockpit of the tractor shown in FIG. 1; FIG. 5 is a hydraulic circuit of a conventional tractor. FIG. 6 shows a side view of an all-crawler tractor according to an embodiment of the present invention. FIG. 7 is a hydraulic circuit of the tractor of FIG. FIG. 8 is a side view of a dozer attachment portion of a conventional tractor. FIG. 9 shows a side view of the tractor according to the embodiment of the present invention. FIG. 10 is a partial perspective view of a fuel tank of the tractor according to the embodiment of the present invention. 11 is a plan view of a fuel tank portion of the tractor of FIG. [Description of Signs] 1 Crawler drive shaft 2 Crawler drive wheels 3F, 3R Front and rear driven wheels 4a, 4b,
4c Roller wheel 5 Crawler frame (supporting member) 5a Roller wheel support portion 5b Crawler frame standing portion 6 Crawler (wheel) 6b Central protrusion 7 Crawler traveling device 8 Cabin 9 Body 10 Tractor 11 Bonnet 12 Engine 13 Transmission case 14 Front wheel Reference Signs List 15 Center pivot 16 Steering post 17 Steering handle 19 Pilot seat 20 Running speed change lever 21 Elevating operation lever 23 Lift arm 24 Work machine 26 Cylinder case 34 Fuel tank 34a Fuel tank empty part 36 Top link 37 Left and right lower links 38, 39 Fuel Tank reinforcement stay 40 Fender 41 Upper and lower mounting plate 42 Vertical column 43 Horizontal column 45 Fuel tank front cover 51 Full crawler 52 Discharge blade 53 Dozer 55 Body frame 56 Lift arm 57 Lift plate Cylinder 58 Lift arm hydraulic cylinder 60 Main relief valve 61 Oil tank 65 One-way valve 66 Throttle valve 67 Switching valve 69 Safety valve 70 Foot brake 71 Brake arm 72 Cylindrical 72a Cylindrical rotation fulcrum 72b Nipple for grease up 74 Floor 74a Floor Peephole 76 Pipe 77 Extension rod 77b Oil passage 100 Wire

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Takashi Ochi             1 Iseki Agricultural Machinery, 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department (72) Inventor Kiyofumi Sakurahara             1 Iseki Agricultural Machinery, 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department (72) Inventor Matsuhiko Tsunekawa             1 Iseki Agricultural Machinery, 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture             Technology Department F term (reference) 3D038 CA08 CA12 CA13 CA14 CA18                       CA19 CA22 CB06 CB09 CC00                       CD02 CD09

Claims (1)

Claims 1. A vehicle body 9, a wheel 6, 14 mounted on the vehicle body 9, an engine 12 for driving the wheels 6, 14 also mounted on the vehicle body 9, and A driving vehicle provided with a cockpit 19 provided, a fuel tank 34 for an engine attached to a rear portion of the cockpit 19, and a fuel tank detachably attached between the fuel tank 34 and a rear surface of the cockpit 19. 34 front cover 45
A traveling vehicle comprising: