JP2024043639A - work vehicle - Google Patents

Abstract

[Problem] To provide a work vehicle to which a fuel tank can be easily attached. [Solution] A fuel tank 31 is provided on one of the left and right sides of a transmission case 8, a tank support plate 32 is provided to receive the bottom of the fuel tank 31, a tank bracket 36 is provided on the side of the transmission case 8, a groove 32c that fits into the tank bracket 36 is formed in the bottom surface of a second support portion 32B of the tank support plate 32, and the tank support plate 32 is provided to be slidable along the longitudinal direction of the tank bracket 36. [Selected Figure] Figure 6

Description

The present invention relates to a work vehicle.

Tank stays attached to the rear left and right sides of the mission case, a rear frame that is connected to the lower end of the tank stay and extends to the sides of the mission case and supports the rear of the fuel tank, and the front of the mission case. One end is connected to the mounting brackets attached to the left and right sides, and the other end is connected to the rear frame, and the front frame supports the front of the fuel tank.The front frame, together with the rear frame, supports the fuel tank. A work vehicle is known in which a fuel tank is stably attached by a configuration including a bottom support part that supports the bottom surface of the tank, and a side support part that rises from one end of the bottom support part and supports the inner surface of the fuel tank. Patent Document 1).

JP 2020-93625 A

The tractor shown in Patent Document 1 allows even large fuel tanks to be installed stably.

However, in the above configuration, the part that is fixed to the transmission case and the part that is fixed to the fuel tank are configured in a complex and intricate manner, leaving room for improvement in assembly workability.

The present invention aims to provide a work vehicle to which a fuel tank can be easily attached.

In order to solve the above-mentioned problems and achieve the purpose, the invention according to claim 1,
A fuel tank 31 is provided on one left and right side of the mission case 8, a tank support plate 32 is provided to receive the bottom of the fuel tank 31, a tank bracket 36 is provided on the side from the mission case 8, and a second support portion of the tank support plate 32 is provided. A groove 32c that fits into the tank bracket 36 is formed on the bottom surface of the tank 32B, and the tank support plate 32 is slidably provided along the longitudinal direction of the tank bracket 36.

The invention described in claim 2 is the invention described in claim 1,
The fuel tank 31 is fixed to the tank support plate 32 by wrapping it with band plates 33, 35. The peripheral shape of the fuel tank 31 at the wrapping portion of the band plate 33 on the rear side is formed into a recess 44, and the outer periphery of a joining flange 45 of the transmission case 8, which is formed in front and rear portions, is fitted into this recess 44.

The invention described in claim 3 is the invention described in claim 1 or claim 2, in which the tank support plate 32 is composed of a first support part 32A that supports the rear side of the fuel tank 32, a second support part 32B that is shaped to fit the tank bracket 36 and is formed so as to be slidable in the longitudinal direction of the tank bracket 36, and a third support part 32C that supports the front side of the fuel tank 32, and at the front side of the tank support plate 32, a connecting part 37 that constitutes the third support part 32C is fastened to the vibration-proof support frame 38.

According to the invention described in claim 1, the tank support plate 32 on which the fuel tank 31 is sub-assembled can be slid and attached to the tank bracket 36 attached to the transmission, so the fuel tank 31 can be easily attached. .

According to the invention described in claim 2, in addition to the effect described in claim 1, by aligning the outer periphery of the joining flange 45 of the transmission case 8 with the recess of the tank part, it is possible to attach the fuel tank 31 close to the transmission case 8, and the tank capacity can be secured.

According to the invention set forth in claim 3, in addition to the effects of the invention set forth in claim 1 or claim 2, the tank bracket is connected to the front connecting portion 37 indirectly connected to the transmission case 8 and the groove portion. By supporting the bottom surface with 36, the fuel tank 31 can be firmly attached and supported.

1 is a side view of a tractor according to an embodiment of the present invention. It is a front view of the tractor same as the above. It is a perspective view showing the arrangement of a mission case, a fuel tank, a fender, etc. of the same tractor as above. (A) A perspective view of the fuel tank of the same tractor as seen from the front and upper side, and (B) a perspective view as seen from the bottom side of the same. It is a perspective view of the tank support plate of the tractor same as the above. FIG. 3 is a front perspective view showing how the fuel tank of the tractor is attached to the transmission case. FIG. 2 is a plan view showing the rear side of the fuel tank of the tractor and its surroundings. It is a top view which shows the front part side of the fuel tank of the said tractor, its surroundings, etc. It is a perspective view showing a fuel tank, fuel supply piping, etc. of the tractor same as the above. FIG. 2 is an enlarged side view, partially in section, of the fuel tank of the same tractor.

The present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1, 2, and 3, the tractor 1 includes a body 2 having a front wheel 4 provided as a steering wheel and a rear wheel 5 provided as a driving wheel. The power generated by the engine 7 (FIG. 1) mounted in the hood 6 at the front of the aircraft 2 is transmitted to the rear wheels 5 after being appropriately decelerated by a main transmission and a sub-transmission (not shown). is driven by this power.

The tractor 1 is also capable of transmitting the power generated by the engine 7 and decelerated by the main transmission and the sub-transmission to the front wheels 4 via a front wheel speed increase switching mechanism (not shown). When the front wheel speed increase switching mechanism transmits power, the four wheels of the tractor 1, the front wheels 4 and the rear wheels 5, are driven by the power transmitted from the engine 7, and when the front wheel speed increase switching mechanism cuts off the transmission of power, only the two wheels, the rear wheels 5, are driven by the power transmitted from the engine 7. In other words, the tractor 1 is capable of switching between two-wheel drive and four-wheel drive. In addition, the rear of the tractor 1 is configured to be able to mount a working machine such as a rotary (not shown), and a PTO output shaft 3 for driving the working machine is provided.

The fuselage 2 includes a mission case 8 that houses a main transmission, an auxiliary transmission, a front wheel speed increase switching mechanism, a PTO transmission section that transmits driving force to a PTO output shaft 3, and a transmission case before being attached to the front of the mission case 8. It is composed of a frame 9 and the like. The fuselage 2 has an engine 7 mounted on the rear side of a front frame 9, and a front axle case 15 that accommodates a transmission mechanism to the front wheels 4 installed on the front side of the front frame 9. Then, the engine 7 is covered with a bonnet 6, and a mission case 8 is provided over the rear of the fuselage 2. Further, a driver's seat 10 is provided above the rear portion of the transmission case 8, and mudguard fenders 11 are provided on both left and right sides of the driver's seat 10.

The mudguard fender 11 is located above and forward of the rear wheels 5, and covers the rear wheels 5 to prevent mud stirred up by the rear wheels 5 from scattering. That is, the tractor 1 includes a transmission case 8 that constitutes the machine body 2, a driver's seat 10 located above the rear of the transmission case 8, and mudguard fenders 11 located on both the left and right sides of the driver's seat 10.

The driver's seat 10, where the driver sits when operating the tractor 1, is located between the left and right mudguard fenders 11. In front of the driver's seat 10, as shown in Figs. 1 and 2, a steering handle 13 used to steer the front wheels 4 is provided. The steering handle 13 is disposed on the upper end side of a handle post 14 that rotatably supports the steering handle 13. In addition, below the handle post 14, i.e., near the feet of the driver when he/she is sitting in the driver's seat 10, a clutch pedal 20, a brake pedal (not shown) for braking the rear wheels 5 in response to pedal operation, and an accelerator pedal (not shown) are provided.

Also, to the right of the driver's seat 10, there is disposed a work equipment lift lever 27 for raising and lowering a work equipment such as a rotary (not shown) mounted on the rear of the tractor 1, and to the left of the driver's seat 10, there are disposed a main speed change lever 25 for operating the main speed change gear when the tractor 1 is traveling, and a sub-speed change lever 26 for the sub-speed change gear. The main speed change lever 25 can operate the main speed change gear, which is the gear change of the main speed change gear, and can switch between automatic speed change, which automatically changes the main speed, and manual speed change, which is performed at the driver's discretion. In manual speed change, the main speed change lever 25 switches the reduction ratio of the main speed change gear to one of eight speeds. The sub-speed change lever 26 operates the sub-speed change gear and can switch the traveling speed to very low speed, low speed, medium speed, high speed, and neutral.

Further, the tractor 1 is provided with a fuel tank 31 below the step 30 for storing fuel to be supplied to the engine 7. The fuel tank 31 is provided on one left and right side of the mission case 8 (on the left side in the illustrated example). That is, the rear side of the tank support plate 32 that receives the bottom of the fuel tank 31 is fixed with a tank band or band plate 33, and the front side of the pipe frame has a double structure in which the upper side is connected to each other. 34 and the band plate 35 to form a so-called sub-assembly. A tank bracket 36 is provided laterally from the mission case 8, and the subassembly is placed on this tank bracket 36 and fastened and fixed in place (FIG. 6).

The tank support plate 32 will now be described in detail. As shown in Figures 4 and 5, the tank support plate 32 has a rectangular first support portion 32A that supports the rear side of the tank, a second support portion 32B that is shaped to fit the tank bracket 36 and is formed to be slidable in the longitudinal direction of the tank bracket 36, and a third support portion 32C that supports the front side of the tank and has its inner edge reinforced by one of the two frames 34a of the pipe frame 34. A front cover 32f and a side cover 32s are provided integrally or appropriately connected to the edges of the first support portion 32A and the third support portion 32C. Therefore, the fuel tank 31 is supported in a stored state by the tank support plate 32, the front cover 32f, and the side cover 32s.

In addition, at the front of the fuel tank 31, the connection portion 37 between the pipe frame 34 and the band plate 35 is fastened by bolts 39 or the like to an anti-vibration support frame 38 that supports the floor panel portion of the safety frame structure and the floor panel portion of the cabin structure in a vibration-proof manner relative to the transmission case 8, and is supported by hanging. Note that the work is made easier if the anti-vibration support frame 37 is configured so that the bolt fastening work can be performed from the top side.

As described above, the second support portion 32B is configured to slide relative to the tank bracket 36 extending from the transmission case 8. That is, a groove portion 32c that fits into the tank bracket 36 is formed on the bottom surface of the second support portion 32B of the tank support plate 32. The tank bracket 36 and the tank support plate 32 are fastened and fixed in place when they are fitted together.

The fuel tank 31 is molded from resin, with the front side forming a fuel supply section 31A, the middle section 31B being wide on the left and right sides and the outer surface being stepped to match the arrangement of the steps 30, and the rear section 31C being slightly narrower. A supply pipe 40 and a return pipe 41 to the engine are provided toward the front of the fuel tank 31, and a fuel pump 43 is interposed between the supply pipe 40 (Figure 9).

As shown in Figures 7 and 8, the periphery of the fuel tank 31 at the wrapping portion of the tank band or band plate 33, 35 is formed with a recess 44 to prevent the rear side band plate 33 from shifting. The outer periphery of the joining flange 45 that divides the transmission case 8 into the front and rear parts can be fitted into this recess 44 (Figure 7).

As shown in FIG. 10, a fuel reservoir 31a is formed at the bottom of the intermediate portion of the fuel tank 31. The fuel reservoir portion 31a is formed in the bottom portion 31b of the fuel tank 31 in the shape of a groove bottom having an appropriate width in the front and back and slightly lower than the bottom portion 31b, and its depth is also arbitrary. The front and rear positions of the fuel reservoir 31a are located between the front wheels 4 and the rear wheels 5, and where there is little vertical movement even if the tractor 1 vehicle body is tilted back and forth, for example, at the center between the front wheels 4 and 5, or Located nearby.

A suction pipe 42 connected to a supply pipe 40 for supplying fuel from the fuel reservoir 31a to the engine 7 is configured, and the tip 42a of this suction pipe 42 is placed at a lower position than the bottom 31b other than the fuel reservoir 31a. are doing.

When configured in this way, even if the tractor 1 body tilts forward and backward, fluctuations in the vertical position of the fuel reservoir 31a are suppressed, and fuel suction by the suction pipe 42 arranged in the fuel reservoir 31a is stabilized.

Further, the return pipe 41 that returns the remaining fuel from the engine 7 to the fuel tank 31 has an upper and lower part 41a configured almost parallel to the suction pipe 4, and a front and rear part 41b configured near the bottom 31b of the fuel tank 31. The tip 41c of the return pipe 41 is provided at the rear of the fuel tank 31 at a position away from the tip 42a of the suction pipe 42. With this configuration, it is possible to prevent the returned fuel whose temperature has increased from being immediately sucked into the suction pipe 40a, and to prevent the supply of high-temperature fuel to the engine 7. Moreover, generation of air bubbles near the suction pipe tip 42a can be suppressed.

A safety frame 50 is provided to protect the driver sitting in the driver's seat 10 when the vehicle body falls. The safety frame 50 has an inverted U-shape in which a pair of left and right frame parts 51L, 51R are connected at their bases to a rear axle case (not shown) that houses a rear wheel shaft, etc., and the upper parts of the left and right frame parts 51L, 51R are connected. It consists of an upper frame part 52 and has a gate shape.

Light devices 55L and 55R are attached to the insides of the left and right frame parts 51L and 51R. Note that the lighting devices 55L and 55R are combination lamps that integrate a direction indicator, a tail lamp, a brake lamp, and the like.

8 Mission case 31 Fuel tank 32 Tank support plate 32A First support part 32B Second support part 32C Third support part 32c Groove 33 Band plate 35 Band plate 36 Tank bracket 44 Recess 45 Joint flange

Claims (3)

A work vehicle characterized in that a fuel tank (31) is provided on one of the left and right sides of a transmission case (8), a tank support plate (32) is provided to receive the bottom of the fuel tank (31), a tank bracket (36) is provided on the side of the transmission case (8), a groove (32c) is formed on the bottom surface of a second support part (32B) of the tank support plate (32) to fit into the tank bracket (36), and the tank support plate (32) is provided so as to be slidable along the longitudinal direction of the tank bracket (36). The fuel tank (31) is fixed by being wrapped around the tank support plate (32) with band plates (33, 35), and the peripheral shape of the fuel tank (31) is determined at the part where the band plates (33, 35) are wrapped. 2. The work vehicle according to claim 1, wherein the recesses (44a, 44b) are formed, and the outer periphery of a joining flange (45) of a transmission case (8) formed in front and rear parts is fitted into the recess (44a). The tank support plate (32) has a first support portion (32A) that receives the rear side of the fuel tank (32) and a shape that follows the tank bracket (36), and is slidable in the longitudinal direction of the tank bracket (36). The third support part (32C) receives the front side of the fuel tank (32). The work vehicle according to claim 1 or 2, wherein the connecting portion (37) is fastened to a vibration-proof support frame (38).

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