JP2002248958A - Axle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach a weight without increasing the total length of a body in a front wheel driving type traveling vehicle. SOLUTION: In a front axle case 10 of the front wheel driving type traveling vehicle, a front wheel driving input shaft 11 is arranged at the lateral central part of the front axle case 10, the weight 15 is mounted inside the both sides of the front wheel driving input shaft 11 laterally nearly symmetrically, and the weight 15 is fixed from an oil filler port 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-wheel drive type traveling vehicle, and more particularly to a front axle for a four-wheel drive tractor.

[0002]

2. Description of the Related Art Conventionally, in a four-wheel drive tractor,
Balance the front and rear weight with the work machine attached to the rear,
2. Description of the Related Art A technique for attaching a weight to a front portion of a fuselage in order to prevent a front portion from being lifted by a driving reaction force of a rear wheel is known. The weight was detachably attached to a bumper provided at the front end of the engine frame.

[0003]

However, in the prior art, since the weight is attached to the bumper portion at the front end of the fuselage, the overall length of the fuselage becomes long, and the weight provided at the tip of the fuselage when turning in a narrow place is required. They could be hit, causing damage to the aircraft and breaking the ridges. In addition, when the work is performed with the rotary tillage device attached, the uncultivated land portion at the edge of the field increases, resulting in poor work efficiency.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

That is, in the front axle case of the four-wheel drive type traveling vehicle, a front wheel drive input shaft is disposed at the left and right central portions of the front axle case, and weights are provided on both sides of the front wheel drive input shaft. It was decorated.

According to a second aspect of the present invention, an oil supply port is provided on one of the left and right sides of the front axle case, and a weight is fixed by inserting fixing means from the oil supply port.

According to a third aspect of the present invention, the fixing means is also used as an oil detecting stopper.

[0008]

Next, embodiments of the present invention will be described. FIG. 1 is a side view of a tractor equipped with an axle case of the present invention, FIG. 2 is a front cross-sectional view of a front axle case and a front wheel support, FIG. 3 is a side cross-sectional view taken along the line AA in FIG. 2, and FIG. FIG. 5 is a rear cross-sectional view of the front axle case and the front wheel supporting portion with the front side removed, and FIG.
FIG. 6 is a side cross-sectional view of the front axle case showing a state at the time of oil inspection of the fuel filler port similarly.

First, as a four-wheel drive vehicle equipped with an axle device according to the present invention, a schematic configuration will be described using a tractor as an embodiment. In FIG. 1, an engine 2 is mounted in a front hood 1 and a cabin 3 is provided behind the hood 1 in which a driver's seat, a steering wheel and the like on which an operator rides are stored. A transmission case is connected to the rear of the engine 2, and rear wheels 4 are supported on both rear portions of the transmission case via rear axle cases.

A front wheel power take-out case 5 is provided below the transmission case, and a front wheel drive shaft projects forward from the front wheel power take-out case 5 to transmit power to a front axle case 11 via a transmission shaft 6. The front wheels 7 supported by the front axle case 11 are configured to be drivable.

Next, the front axle case 10 of the present invention will be described.
2 and the drive configuration of the front wheels 7 will be described with reference to FIG.
The upper left and right central portions of the front axle case 10 are supported by a fulcrum pin (not shown) so as to be able to swing left and right. Weights 15a and 15b are stored. Front wheel drive input shaft 1 from the left and right center rear surfaces of front axle case 10
1 protrudes rearward, and power is transmitted from the front wheel drive output shaft. A drive gear 12 is fixedly mounted on a front wheel drive input shaft 11 in the front axle case 10, and a ring gear 14 of a front differential device 13 is attached to the drive gear 12.
Are engaged.

The ring gear 14 is fixed to a side of a differential case 16 and a differential pinion 17 is provided in the differential case 16.
17 and differential side gears 18 are arranged and meshed with each other, and the differential pinions 17 are pivotally supported by a pinion shaft 19 fixed to the differential case 16.
The reference numeral 18 is fixed to the center end of the left and right differential shafts 20L and 20R.

The structure of the front wheel supporting portions provided on both sides of the front axle case 10 is substantially the same as the left and right sides, and therefore the left side will be described. A bevel gear 21 is fixedly provided at an outer end of the differential shaft 20. The bevel gear 21 is engaged with a bevel gear 22. Is fixed, the bevel gear 24 meshes with a bevel gear 25, and the bevel gear 25 is
6 is fixed.

An upper portion of the king pin shaft 23 is fixed to a side end of the front axle case 10.
7 is rotatably supported via a bearing, and the kingpin shaft 2
The lower portion of 3 is rotatably supported via a bearing on a steering rotation case 28 rotatably supported by the lower portion of the fixed case 27. The steering rotation case 28 includes a wheel case 29.
The axle 26 is rotatably supported by the wheel case 29 and the steering rotation case 28 via bearings 30 and 31. The front wheel 7 is fixed to the front wheel axle 26 with bolts or the like.

The front wheel axle 26 and the wheel case 2
9 and the bevel gear 25 are integrally assembled. That is, the axle 26 has a flange portion 26a formed at one end to fix the wheel of the front wheel 7, and the axle portion is prevented from falling off the wheel case 29 by the retaining ring via the seal 32. The steering turning case 28 is connected to a knuckle arm (not shown), and is connected to the steering handle from the knuckle arm via a link or the like, and the front wheel 7 is steered left and right by turning the steering handle. It can be turned around.

The front axle case 10 forms a storage space for the front wheel drive input shaft 11 at the center on the left and right sides, and weights 15a on both left and right sides centering on the front wheel drive input shaft 11 on both sides.
15b is accommodated, and a fuel supply port 35 is provided on the front axle case 10 on one side of the left and right sides. And
A front differential device 13 is mounted on a side opposite to the oil supply port 35. The front differential device 13 is rotatably supported between the front differential device 13 and the front axle case 10 via bearings 36 and 37, and a drive input to the ring gear 14 is provided. The force is applied from the front differential device 13 to the left and right differential shafts 20L and 20R.
And the front wheels 7 are driven via the bevel gear 21 and the like in the fixed case 27.

The weights 15a and 15b are formed in a substantially cylindrical shape by metal or the like, and the differential shafts 20R.
20L can be inserted, one weight 15a is smaller (lighter) than the other weight 15b, and the weight of the weight 15a plus the weight of the front differential device 13 and the weight of the other weight 15b are substantially the same. In this way, the space on the left and right can be filled, and the weight on the left and right can be balanced. And these weights 15a and 15b
The weight added is approximately the same as the weight of the front weight conventionally attached to the bumper.

One end surface of the weight 15a is in contact with an outer end surface of the bearing 37, and the weight 15a
Is in contact with the spigot portion 27 a of the fixed case 27. Thus, the front wheel drive input shaft 1
1 transmits power from the drive gear 12 to the ring gear 14, a thrust force is generated in the ring gear 14 in a direction opposite to the tooth surface side, and the thrust force is applied to the front differential device 1.
3. Fixed case 27 via bearing 37, weight 15a
It will be received at the end face. And weight 1
The outer peripheral portions at both ends of 5a are held by bearing holes in axle case 10 and spigot holes of the fixed case.

An oil supply port 35 provided on the side opposite to the front differential device 13, that is, on the tooth surface side of the ring gear 14, opens an oil supply hole 10a in the upper part of the axle case 10, as shown in FIG. The oil supply hole 10a is provided with the sealing material 4
0, a cap 41 is screwed in, and a bolt hole 41a is formed through the cap 41 at the axis thereof.
A bolt 42 serving as a fixing means of the weight 15b is inserted through 1a through a sealing member 40. On the other hand, in the weight 15b, the bolt hole 15c is opened in a position perpendicular to the differential shaft 20L (vertical direction) so as to be aligned with the position of the oil supply port 35. Thus, the bolt 42 is inserted into the bolt hole 41a of the cap 41, screwed into the bolt 15c of the weight 15b, and tightened, so that the bolt 42 can be fixed in the accelerator case 10.

The upper surface of the weight 15b has a notch 15d.
2 is provided to prevent the weight 15b from rotating by contact with the boss 10b of the cap 41, and FIG.
As shown in FIG. 3, a convex portion 10c is formed inside the upper left and right center of the front axle case 10 so as to come into contact with the notch 15e formed in the weight 15b.
Of both ends are the convex part 10c and the spigot part 27 of the fixed case 27.
a so that positioning can be performed. The bolt 42 can also serve as an oil inspection stopper, and the bolt hole 1
5c is vertically penetrated so that the lubricating oil can easily penetrate, and the tip of the bolt 42 is connected to the oil gauge 4 as shown in FIG.
By adopting the shape of 4, the oil inspection can be easily performed simply by attaching and detaching. Further, the inside of the front axle case 10 is conventionally used to store the lubricating oil in the space, but the amount of the lubricating oil can be reduced by storing the weights 15a and 15b.

The weight of the body can be reduced and the front weight can be attached to and detached from the bumper as in the conventional case, so that the specification can be easily changed. A weight 15 is provided in the front axle case 10.
When the interior is not provided, as shown in FIGS. 4 to 6, the collar 43 is housed and arranged in place of the weight 15a so as to receive the thrust force, and the weight 15b on the side opposite to the front differential device 13 is removed. The oil inlet 35 is provided with an oil inspection gauge 44. Thus, the oil inspection can be easily performed.

[0022]

The present invention is configured as described above.
The following effects are obtained. That is, in the front axle case of the four-wheel drive type traveling vehicle, the front wheel drive input shaft is disposed at the left and right central portions of the front axle case, and weights are provided on both sides of the front wheel drive input shaft. Therefore, there is no need to attach a front weight to the front end of the aircraft, saving the trouble of attaching and detaching, enabling stable running, the overall length of the aircraft is not lengthened, and there is no damage when turning in a narrow place, etc. The breakage of the aircraft and the collapse of the ridge can be prevented. Further, since the space in the front axle case is filled with the weight, the amount of lubricating oil can be reduced. In addition, by arranging the weights in consideration of the weight of the front differential device and arranging them on the left and right, the right and left weight balance can be improved.

According to a second aspect of the present invention, an oil supply port is provided on one of the left and right sides of the front axle case, and a fixing means is inserted from the oil supply port to fix the weight. Therefore, holes, taps, etc. for fixing the weight are provided. Need not be newly provided on the front axle case, the number of components does not increase, the components can be easily fixed, and generation of abnormal noise, deformation and breakage of components can be prevented.

According to a third aspect of the present invention, since the fixing means is also used as an oil detecting plug, the number of parts does not increase and the structure is not complicated, and the oil can be easily inspected.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor equipped with an axle case of the present invention.

FIG. 2 is a front sectional view of a front axle case and a front wheel support.

FIG. 3 is a side sectional view taken along the line AA in FIG. 2;

FIG. 4 is a rear cross-sectional view of a front axle case and a front wheel supporting portion from which weights have been removed.

FIG. 5 is a sectional view taken along the line BB in FIG. 4;

FIG. 6 is a side cross-sectional view of the front axle case showing a state at the time of oil inspection of the fuel filler port.

[Explanation of symbols]

 Reference Signs List 10 Front axle case 11 Front wheel drive input shaft 15 Weight 35 Oil filler 42 Bolt (fixing means)

Claims (3)

[Claims] 1. A front axle case of a four-wheel drive type traveling vehicle, wherein a front wheel drive input shaft is disposed at the left and right central portions of the front axle case, and weights are provided on both sides of the front wheel drive input shaft. Axle equipment to do. 2. The axle device according to claim 1, wherein an oil supply port is provided on one of the left and right sides of the front axle case, and a weight is fixed by inserting a fixing means from the oil supply port. 3. The axle device according to claim 2, wherein said fixing means is also used as an oil tap.