JP2023091613A - work vehicle - Google Patents

Abstract

To facilitate an assembly work around an engine.SOLUTION: A work vehicle includes a base plate 60 that includes a front plate portion 60f and a rear plate portion 60r at a front bottom within an engine room 35. A battery 57, a cooling water reservoir tank 66 and a hood lock portion 68 are provided at the front plate portion 60f side. The rear plate portion 60r is fastened in a state lower than the front plate portion 60f, and an air cleaner 33, an oil cooler 55 and a fuel cooler 56 are provided at the rear plate portion 60r side.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a work vehicle such as an agricultural tractor, and more particularly to the construction of a base plate in the front portion inside the bonnet.

Conventionally, there is a configuration in which a battery mounting portion, a radiator bracket for mounting a radiator, and an air filter support stay for mounting an air filter are provided on a base plate in the front part of the bonnet of an agricultural tractor (Patent Document 1).

JP 2018-34534 A

According to the configuration of Patent Document 1, various devices can be arranged using the space on the base plate. As a result, the weight increased and assembly became difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a working vehicle that facilitates assembly work around an engine.

In order to solve the above problems, the present invention has taken the following technical measures.

According to the first aspect of the invention, the base plate 60 having the front plate portion 60f and the rear plate portion 60r is provided at the bottom of the front portion in the engine room 35, and the battery 57 and the cooling water reserve are provided on the front plate portion 60f side. A tank 66 and a bonnet lock 68 are provided.

According to the invention of claim 2, in the invention of claim 1, the rear plate portion 60r is fixed in a state lower than the front plate portion 60f, and the air cleaner 33, the oil cooler 55 and the A fuel cooler 56 is provided.

According to a third aspect of the present invention, in the first aspect of the invention, an upright edge 69 having an appropriate height is formed at the rear end of the front plate portion 60f so that the rear end portion of the battery 57 can be locked. bottom.

According to the fourth aspect of the invention, in the third aspect of the invention, a notch portion 70 is formed on the rear end side of the front plate portion 60f, and a harness 71 for connecting the battery 57 is routed there.

According to the first aspect of the invention, since the base plate 60 is divided into the front plate portion 60f and the rear plate portion 60r, the number of sub-assembly parts can be reduced and assembly can be facilitated. According to the invention of claim 2, in addition to the effect of claim 1, only the rear part can be dropped into the front frame of the fuselage, and the volume of the cooling space in front of the radiator 40 can be expanded. As a result, the oil cooler 55, the fuel cooler 45, and their peripheral devices can be arranged with some margin, and the easiness of assembly is improved.

According to the third aspect of the present invention, in addition to the effect of the first aspect, the rear end of the battery 57 can be brought into contact with the standing edge 69, so that the battery 57 can be positioned and fixed securely. can be done.

According to the fourth aspect of the invention, in addition to the above effects of the third aspect of the invention, the harness 71 for connecting the battery 57 is routed in the notch portion 70 provided in a predetermined manner, so wiring can be facilitated.

1 is a side view of an agricultural tractor according to an embodiment of the present invention; FIG. It is a top view of an agricultural tractor same as the above. It is a side view which shows the transmission case and peripheral structure of an agricultural tractor same as the above. It is the side view which looked at the bonnet part of the same agricultural tractor from the body left side. It is the side view which looked at the bonnet part same as the above from the body right side. It is a perspective view of the engine room in a bonnet same as the above. It is a perspective view of an engine bracket same as the above, and a base plate. It is an exploded perspective view of the front-and-rear-part plate part of the same agricultural tractor.

EMBODIMENT OF THE INVENTION Below, embodiment which concerns on this invention is described in detail based on drawing.

In FIGS. 1 and 2, an agricultural tractor as a work vehicle performs work in fields or the like while self-propelled by power. The agricultural tractor includes drivable and steerable left and right front wheels 2L and 2R on the front side of the machine body 1, left and right rear wheels 3L and 3R mounted on the rear side of the machine body 1, an engine 4 as a power source, A transmission case 5 in which a transmission is internally provided is provided. In addition, in the figure, the symbol L indicates the left side and the symbol R indicates the right side of the members provided as a pair on the left and right.

A connecting device 7 to which a working machine 6 such as a rotary can be attached is arranged at the rear portion of the machine body 1 . The coupling device 7 is a three-point link consisting of a top link 7a at the upper center and lower left and right lower links 7b, 7b. 7b is rotated to move the work machine 6 up and down.

In the tractor 1, a steering handle 13 is erected from a dashboard 12 in front of an operator's seat 10 on the fuselage. Various operation levers such as a lever and a shift lever are arranged.

A transmission mechanism is arranged in the transmission case 5 . As for the transmission mechanism, power from the engine 4 is transmitted to rear wheels and front wheels via a known hydraulic continuously variable transmission (HST) 14 and an auxiliary transmission mechanism 15 . 3, the rotation of the output shaft of the engine 4 is transmitted to the input shaft 17 of the mission case 5 via the main clutch 16. As shown in FIG. The rotation of the input shaft 17 is accelerated by speed increasing gears 18 and 19 and transmitted to the input shaft 20 of the HST 14 .

The HST 14 is a hydrostatic continuously variable transmission and is composed of a variable displacement hydraulic pump 21 and a fixed displacement hydraulic motor 22 . change the rotation of the . The inclination of the movable swash plate 23 is changed by the trunnion shaft linking means 25 which operates by detecting the movement of the forward/reverse pedal 24, and the rotation of the motor output shaft 22a of the hydraulic motor 22 is changed. The number of revolutions of the pump output shaft 21 a directly connected to the hydraulic pump 21 is the same as the number of revolutions of the input shaft 20 . The rotation of the pump output shaft 21 a is transmitted to the PTO intermediate shaft 29 via the PTO forward/reverse clutch 27 and the PTO hydraulic clutch 28 , further transmitted to the PTO shaft 31 via the PTO transmission 30 , and taken out of the mission case 15 . and drives a work machine 6 such as a rotary.

The motor output shaft 22a of the hydraulic motor 22 drives the rear wheels 3L and 3R through the auxiliary transmission 15, and further drives the front wheels 2L and 2R from the auxiliary transmission 15 through the front wheel acceleration switching mechanism 32. drive.

Next, the engine room 35 in which the engine 4, its accessories, the air cleaner 33 and the like are arranged in the bonnet 36 will be described with reference to FIGS. 4 and 5. FIG. The rear part of the engine 4 is connected to the front end of the transmission case 5, and an axle bracket 39 for supporting the axle housing of the front wheel 3 is connected to the front side of the engine 4, thereby forming a body frame as a whole. An engine room 35 is formed within the bonnet 36 between the partition wall portion 34 located on the front side of the dashboard 12 and the arrangement position of the radiator 40 .

The bonnet 36 is integrally formed with a front grille 36a that supports the headlights 41, a hood portion 36b on the ceiling, and left and right extended cover portions 36cL and 36cR extending from the hood portion 36b to the side surfaces. It has a configuration that allows the front to open widely around the opening and closing fulcrum. The left and right extended cover portions 36cL and 36cR extend the lower end of the front half of the bonnet 36 to the axle bracket 39 so as to cover the entire side surface of the bonnet 36, and the rear half of the bonnet 36 to discharge hot air from the engine room 35. In order to secure the open portions 42L and 42R, curved edges 36dL and 36dR extending obliquely rearward and upward from the side portion of the radiator 40 to the partition wall portion 34 are formed. The above-described open portions 42L and 42R are formed on the lower side of the curved edges 36dL and 36dR.

A left side cover 37 and a right side cover 38 formed to be air permeable are attached to the openings 42L and 42R, respectively. By using a permeable material such as punching metal, hot air in the engine room 35 can be discharged to the outside of the machine, and safety can be ensured by preventing hands and fingers from entering the machine.

By the way, the shape of the left and right side covers 37 and 38 is determined according to the object of safety protection. The left side cover 37 covers the belt transmission mechanism 44 and the cooling fan 45 for the radiator 40, which are arranged in the front and rear space 43 extending from the lower half of the radiator 40 to the front side of the engine 4. It is configured to cover the side surface of the turbo mechanism 46 as well. The turbo mechanism 46 introduces exhaust gas from the exhaust passage into the turbine of the turbocharger, and supercharges the air supply passage with the energy of the exhaust gas. The left side cover 37 is fixed by providing a connecting portion 37a at the front lower end portion so that the front lower end portion can be detachably fastened to the side surface of the axle bracket 39, and the rear end portion is connected to the partition wall portion 34 or the partition wall. A connecting portion 37b is provided to be fastened to a columnar frame portion that fixedly supports the portion 34. As shown in FIG.

The other right side cover 38 is formed in a size that mainly covers the belt transmission mechanism 44 and the cooling fan 45 in the space 43, and has a connection portion 38a formed by bending 90 degrees toward the bottom of the rear end of the side cover 38. 4 It has a structure that can be detachably fastened to the main body.

Next, regarding exhaust gas treatment from the engine 4, the engine 4 adopts a diesel engine and uses a diesel oxidation catalyst (DOC) and particulate matter (PM) to oxidize nitrogen oxides (NOx) contained in the exhaust gas. An exhaust gas purifying device 50 having a diesel particulate filter (DPF) to collect is arranged above the engine 4 . Exhaust gas is introduced from the exhaust pipe of the engine 4 into the exhaust gas purifier 50, processed by the DOC and DPF, and then discharged from the exhaust side through the exhaust pipe 51 to the outside of the machine. The exhaust pipe 51 includes a horizontal portion 51a connected to the discharge portion of the DPF 50 and directed toward the upper portion of the engine 4, a vertical portion 51b disposed on the right side of the space 43 in which the belt transmission mechanism 44 is disposed, and an axle bracket 39. The right side cover 38 is configured to cover the hanging portion 51b and the lower ejection portion 51c.

As shown in FIG. 6, inside the bonnet 36, the belt transmission mechanism 44, the cooling fan 45, and the radiator 40 are provided from the front of the engine 4 toward the front thereof. , a fuel cooler 56, a battery 57 and the like are provided.

That is, while the rear part of the engine 4 is connected to the front end of the transmission case 5, the axle bracket 39 that supports the axle housing of the front wheel 2 is connected to the front side of the engine 4 to form a body front frame, A support frame for the radiator 40 is configured in the body front frame.

That is, as shown in FIG. 7, regarding the support structure of the radiator 40, the base plate 60 is formed in an arc shape so that the front is aligned with the front lower edge of the bonnet 36, and the middle and lower parts are laterally connected to the rear part. Thus, a radiator support frame 61 having an open front surface is constructed by fixing the rigid upright members 61L and 61R by fastening means or welding means.

An air cleaner support portion 62 is formed in front of the upper portion of the support frame 61 . A fan shroud 63 is provided on the rear side of the radiator 40 supported by the support frame 61 . The fan shroud 63 has a large circular notch on the inner side to cover the outer circumference of the cooling fan 45. The outer shape of the fan shroud 63 has a rectangular shape when viewed from the rear, and at least left and right walls 63L and 63R are formed. A partition wall 64 is provided on the upper portion of the fan shroud 63 to hermetically partition the inner periphery of the bonnet 36 forward and backward.

By the way, the front bottom portion of the engine room 35 is provided with a base plate 60 consisting of a front plate portion 60f and a rear plate portion 60r. Of these, the front plate portion 60f is supported and fixed by fastening a mounting plate 65 formed below to the front body frame such as the axle bracket 39, and a battery 57 mounting portion and a cooling water reserve tank 66 are mounted on the upper portion of the front plate portion 60f. A bonnet lock portion 68 that can be engaged or released is provided at the front lower end portion of the support frame 67 and the bonnet 36 . The support frame 67 is erected on the right side of the front plate portion 60f, and has a rail portion 67a capable of slidingly guiding a guide portion provided on the rear surface of the cooling water reserve tank 66. The tank 66 is stopped and held at a stopper 67b position. It is a configuration that Also, the battery 57 is fixed to its mounting portion by a known arm means 57a, and the rear end of the front plate portion 60f is formed with an upright edge 69 having an appropriate height to support the rear end of the battery 57. The battery 57 can be positioned and fixed securely by being able to come into contact with it. A notch portion 70 is formed on one side of the front plate portion 60f on the rear end side (the left side in the drawing), and a harness 71 for connecting the battery 57 is arranged. Further, regarding the bonnet lock portion 68, when the front lower edge of the bonnet 36 is in contact with the upper surface of the base plate 60, the upward movement of the bonnet side lock pin (not shown) is restricted by the lock plate 68a that can be opened and closed, and the release lever 68b is pulled. This is a known configuration in which the lock plate 68a is opened by , and the restriction of the lock pin is released.

On the other hand, the rear plate portion 60r is sub-assembled with the radiator support frame 61, and is configured to be fastened and fixed to the front body frame. In addition to the air cleaner support portion 62, the radiator support frame 61 has bracket members 72L and 72R provided forwardly projecting from the standing members 61L and 61R, and a rear plate portion 60r as a mounting surface for the oil cooler 55 and the fuel cooler 56. constitutes the support of The rear plate portion 60r is fixed lower than the front plate portion 60f. In other words, by dividing the front and rear parts, only the rear part can be dropped into the front frame of the fuselage, and the volume of the cooling space in front of the radiator 40 can be expanded. and its peripheral equipment can be arranged with a margin, and the easiness of assembly is improved.

4 Engine 33 Air cleaner 35 Engine room 36 Bonnet 55
55 oil cooler 56 cooling water reserve tank 57 battery 60 base plate 60f front plate portion 60r rear plate portion 66 cooling water reserve tank 68 bonnet lock portion 70 notch portion 71 harness

Claims (4)

A base plate (60) having a front plate portion (60f) and a rear plate portion (60r) is provided at the bottom of the front portion in the engine room (35), and a battery (57) is provided on the front plate portion (60f) side, A work vehicle comprising a cooling water reserve tank (66) and a bonnet lock (68). The rear plate portion (60r) is fixed lower than the front plate portion (60f), and an air cleaner (33), an oil cooler (55) and a fuel cooler (56) are provided on the rear plate portion (60r) side. The work vehicle according to claim 1. 2. A working vehicle according to claim 1, wherein a rear end of the front plate portion (60f) is formed with an upright edge (69) having an appropriate height so that the rear end of the battery (57) can be locked. 4. A working vehicle according to claim 3, wherein a notch portion (70) is formed on the rear end side of the front plate portion (60f) and a harness (71) for connecting the battery (57) is routed there.

Images