JP3873432B2 - Front frame for agricultural vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a front frame in an agricultural vehicle such as an agricultural tractor.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, a power steering unit in an agricultural vehicle is disposed in a column portion that supports a steering shaft, so that assembly inspection is not easy.
[0003]
[Means for Solving the Problems]
The present invention is intended to eliminate the above-mentioned drawbacks, and has taken the following technical means. That is, the base member on the inside for detachably securing the power steering unit (24) of the right and left front framework which supports the axle of the axle bracket (20) one frame frame of (21, 22) (21) ( 27) and on the outside, housings (34) containing bevel gear mechanisms (31, 33) interlocking with the steering handle (9) are fixed detachably, and through holes (23 ) penetrating the frame frame (21) are provided. ) To connect the bevel gear mechanism (31, 33) and the power steering unit (24) with the shaft (29) , while the inner side of the other frame frame (22) of the left and right frame frames (21, 22). The pressure reducing valve case (39) is positioned on the outside, and the joint (41) connecting the hydraulic pipe (40) is detachably fixed to the frame frame (22) on the outside. The pressure reducing valve case (39) is detachably fixed to the joint (41) through a through hole (38) that passes through the frame (22), and the power steering unit (24) and the pressure reducing valve are fixed. It is assumed that the front frame of the agricultural vehicle has a case (39) disposed back to back .
[0004]
[0005]
[0006]
[Effects of the invention]
In one framework of the front frame (21, 22) (21), fitted with a power steering unit (24) via a base member (27) on the inside, then the bevel gear mechanism from the outside (31, 33) A built-in housing (34) is attached , and in the other frame frame (22), a pressure reducing valve case (39) is attached in advance, and a joint portion (41) of the hydraulic pipe (40) is fixed from the outside .
A shaft (29) is fitted to the interlocking portion of the power steering unit (24) , and the housing (34) is fitted to the shaft (29) in a fitting manner, and both are connected. This fitting operation can be easily performed from the outside. Of course, by allowing a slight rotation around the shaft (29) , the screwing operation when fixing the bolt of the housing (34) is easy, and the bevel gear mechanism (31, 33) and Connection work with the steering handle (9) can also be facilitated.
[0007]
In the other frame (22) , the pressure reducing valve case (39) can be attached in advance, and the joint (41) of the hydraulic pipe (40) can be fixed from the outside, so that the attachment is easy.
Moreover, a power steering unit (24), for disposing the back-to-back to the pressure reducing valve casing (39), that the through holes of the right and left frame rim (21, 22) and (23 and 38) the same configuration The left and right frame frames (21, 22) can be processed in common, and the number of processing steps can be reduced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes an agricultural tractor body as an example of an agricultural work vehicle, which includes a front wheel 2 and a rear wheel 3 at the front and rear portions, and the rotational power of the engine 5 in the bonnet 4 is appropriately decelerated by a transmission in the mission case 6 and decelerated. The rotational power thus transmitted is transmitted to the front wheel 2 and the rear wheel 3.
[0009]
A handle post 8 is provided in front of the driver's seat 7 in the center of the fuselage so that the steering handle 9 can be turned. The turning operation of the steering handle 9 is configured such that the left and right front wheels 2 and 2 are steered in conjunction with steering. An accelerator lever 10 is disposed in the vicinity of the handle 9, and left and right brake pedals 11, 11 are disposed on the lower side of the handle post 8, and a travel shift lever is provided between the driver seat 7 and the handle post 8. 12 is disposed.
[0010]
A tilling work machine 15 is mounted on the rear part of the machine body 1 through a three-point link mechanism including a top link 13 and lower links 14 and 14 so as to be movable up and down. A hydraulic cylinder mechanism (not shown) that interlocks the top link 13 up and down is configured to expand and contract by a rotating operation of a position lever (not shown) to interlock the working machine 15 up and down. The rotational power output from the engine 5 is appropriately shifted by the main transmission mechanism and the subtransmission mechanism via the main clutch and the forward / reverse switching mechanism, and transmitted to the rear wheel differential mechanism. Further, the rotational power from the auxiliary transmission mechanism can be transmitted to the front wheel drive shaft 18.
[0011]
The front wheel drive shaft 18 is linked to the front wheel differential mechanism 19. The front wheel differential mechanism 19 is supported by an axle bracket 20 so as to be swingable left and right around a longitudinal axis. The axle bracket 20 is supported and fixed to left and right frame frames 21 and 22 extending forward from the engine 5. It is the composition which is done. Each of the frame frames 21 and 22 is configured by joining and fixing two plates. Among these, the right frame frame 21 has a through hole 23 having an appropriate diameter, and a power steering unit inside the frame frame 21. 24 is provided. That is, spacers 25, 25... Having screw holes formed in the inner plate 21a of the frame frame 21 are integrally provided by welding or the like, and the bolts 26, 26 are joined to the spacers 25, 25. The disk-shaped base member 27 to be stopped is fixed to the bolts 28 and 28. A cylindrical body 30 that supports the shaft 29 is fitted and fixed in the center of the base member 27. The cylindrical body 30 is provided with the through hole 23 in a penetrating manner. On the other hand, on the outside of the frame frame 21, a bevel gear mechanism, that is, a bevel gear 31 at the end of the shaft 29 and a bevel gear 33 at the end of the input shaft 32 are engaged with each other with a half case 34, and the inner case portion is covered. Secure with bolts 35.
[0012]
The input shaft 32 is connected to an intermediate shaft 37 linked to the steering handle 9 through a universal joint 36. The left frame 22 is configured in contrast to the right frame 21 and includes a through hole 38. A pressure reducing valve case 39 containing a pressure reducing valve is located inside the frame frame 22. A connecting portion 41 connected to the hydraulic pipe 40 is detachably fixed to the outside by a joining flange 42. The connection part 41 penetrates through the through hole 38 and reaches the inside, and the pressure reducing valve case 39 is fixed to the bolt 42.
[0013]
43 is a radiator and 44 is an air cleaner. An air conditioner unit 45 is disposed at the rear upper part of the engine 5. The opening 47 of the upper bonnet 46 and the air conditioner unit 45 form a passage 48 in communication. A rising edge 47a is formed around the opening 47 by burring, and an openable / closable cover 50 having an air intake port 49 formed on the front surface is provided to cover the opening 47.
[0014]
In the middle of the passage 48, a replaceable filter 51 such as a paper filter is provided with a forwardly inclined posture with the upper side being the front. Accordingly, the outside air can be introduced and the fogging of the window glass is eliminated in the cabin-type tractor, and the filter 51 in the passage 48 is disposed in a forward tilted posture, so the captured dust falls down as it is. Because it does not enter the interior, troubles caused by dust in the air conditioner unit are prevented.
[0015]
8 to 10 show a two-post type safety frame 53 in which the lower end side is fixed to the rear axle housing instead of the cabin specification and the support column 52 is positioned inside the fender, and the outer side of the support column 52 is bent outward. Connect the upper frame 54. That is, the horizontal plate 55 having a slightly larger area is fixed to the upper surface of the support 52 by welding, and the vertical support plates 56 and 57 are similarly fixed to the inner and outer surfaces by welding. On the other hand, the base end portion of the upper frame 54 for bending the rectangular tube material is fixed to the end surface of the upper frame 54 by a U-shaped mounting plate 58 by welding. A U-shaped mounting plate 58 is set in a fitted state between the vertical support plates 56 and 57, and these are fixed by a mounting bolt 59 constituting a pivotal fulcrum and a fitting pin 61 having a gripping portion 60 so as to be detachable. To be connected. In addition, two holes ((A) (B)) are provided on the inner vertical support plate 56 on the center fulcrum center locus of the hole 62 for engaging the fitting pin 61, and the hole 62 is engaged with one hole (A). The vertical posture can be set when mating, and the lying posture can be set when engaging with the other hole (b).
[0016]
At the base end portion of the upper frame 54, the vertical support plate 56, while the vertical portion 63 a is joined to the rear surface of the base end portion of the upper frame 54, the support plate 63 bent into an L shape so as to have a support seat. It fits in the space | interval part of 57, and is fixed by welding. The upper surface portion 63b of the support plate 63 has a through hole as appropriate and serves as a support seat for the work lamp 64. Therefore, the work lamp 64 is located inside the upper frame 54, that is, the frame 54 is located outside, so that it can avoid collision with other objects and prevent damage. is there. In particular, when the support plate 63 is used as in this example, the rear face of the base end portion of the upper frame 54 is advantageously reinforced.
[0017]
The wiring cord 65 for the work lamp 64 is configured to penetrate through the base end portion of the upper frame 54 and reach the lower side, so that the portion exposed to the outside can be reduced and the risk of damage is reduced. Reference numeral 66 denotes a reinforcing guide cylinder, which is formed of a resin material into a cylindrical shape.
[Brief description of the drawings]
FIG. 1 is a front side view of a tractor.
FIG. 2 is an overall side view of the tractor.
FIG. 3 is a plan sectional view of the main part.
FIG. 4 is a partially enlarged cross-sectional view of FIG.
FIG. 5 is an enlarged side view.
FIG. 6 is a side sectional view of a part of the bonnet.
FIG. 7 is a rear view of a part of the safety frame.
FIG. 8 is a side view thereof.
FIG. 9 is a perspective view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tractor fuselage, 2 ... Front wheel, 3 ... Rear wheel, 4 ... Bonnet, 5 ... Engine, 6 ... Mission case, 7 ... Driver's seat, 8 ... Steering wheel, 9 ... Steering handle, 10 ... Accelerator lever, 11, DESCRIPTION OF SYMBOLS 11 ... Brake pedal, 12 ... Traveling shift lever, 13 ... Top link, 14, 14 ... Lower link, 15 ... Tillage working machine, 16 ... Hydraulic cylinder mechanism, 17 ... Position lever, 18 ... Front wheel drive shaft, 19 ... Front wheel Differential mechanism, 20 ... Axle bracket, 21, 22 ... Frame frame, 23 ... Through hole, 24 ... Power steering unit, 25 ... Spacer, 26 ... Bolt, 27 ... Base member, 28 ... Bolt, 29 ... Shaft, 30 ... Cylindrical body 31 ... Bevel gear 32 ... Input shaft 33 ... Bevel gear 34 ... Half case 35 ... Bolt 36 ... Universal joint 37 ... 38: through hole, 39 ... pressure reducing valve case, 40 ... hydraulic distribution, 41 ... connection, 42 ... bolt, 43 ... radiator, 44 ... air cleaner, 45 ... air conditioner unit, 46 ... bonnet, 47 ... opening , 48 ... passage, 49 ... air intake, 50 ... cover, 51 ... filter, 52 ... support, 53 ... safety frame, 54 ... upper frame, 55 ... horizontal plate, 56, 57 ... vertical support plate, 58 ... U-shaped Mounting plate, 59 ... Mounting bolt, 60 ... Holding part, 61 ... Fitting pin, 62 ... Hole, 63 ... Support plate, 64 ... Work lamp, 65 ... Wiring cord, 66 ... Guide tube

Claims (1)

Axle bracket of the front axle (20) left and right framework for supporting one of the framework of the (21, 22) (21) Power steering unit on the inside of the base member for removably securing the (24) (27) On the outside, housings (34) containing bevel gear mechanisms (31, 33) interlocking with the steering handle (9) are detachably fixed, and through holes (23) penetrating the frame frame (21 ) are provided. The bevel gear mechanism (31, 33) and the power steering unit (24) are connected by a shaft (29) , while the left and right frame frames (21, 22) are inside the other frame frame (22). The pressure reducing valve case (39) is positioned, and a joint (41) for connecting the hydraulic pipe (40) is detachably fixed to the frame frame (22). The pressure reducing valve case (39) is detachably fixed to the joint (41) through a through hole (38) penetrating the frame frame (22), and the power steering unit (24) and the pressure reducing valve case (39) are fixed. ) Are arranged back-to-back in an agricultural vehicle.

Images