JPH01282002A - Tractor rear axle case structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a pile related to a rear axle case structure of a tractor (prior art). Some are installed so that they can be moved left and right (trend can be adjusted). A hydraulic cylinder has been proposed as a means for moving the rear wheels in the left-right direction.

In addition, a mounting board for mounting the rear wheel fender is placed on the top side of the rear axle case, and a bracket is placed on the bottom side for mounting the check member. The bracket is attached to the rear axle case by fastening both of them with bolts at the front and rear of the rear axle case.

(Problem to be solved by the invention) When arranging the hydraulic cylinder for tread adjustment,
If it is placed on the lower side of the rear axle case, it will not be possible to secure sufficient ground clearance below the rear axle case, and if it is placed on the front side, there is a risk of hitting an obstacle from the front. Further, if the hydraulic cylinder is arranged around the rear axle case, the hydraulic cylinder becomes an obstacle, making it difficult to attach the rear wheel fender and the check member with the bracket.

Therefore, an object of the present invention is to solve the above-mentioned problems.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above object is that the rear wheels are mounted on both sides of the rear part of the vehicle body 3 via the rear axle case 13.
5 is provided movably in the left and right direction, and the rear axle case 1
Hydraulic cylinder 50 for moving the rear wheel 15 in the left-right direction to the rear side of the rear axle case 13 in a tractor in which a rear wheel fender 26 is attached to the upper surface 20a of 3, and a check member bracket 27 is attached to the lower surface 20b. are provided parallel to the rear axle case 13, and bolt holes 21 are provided on the upper and lower surfaces 20a and 20b of the rear axle case 13 for attaching the rear wheel fender 26 and the bracket 27 for attaching the check member.
are formed correspondingly in the vertical direction.

(Function) The hydraulic cylinder 50 for moving the rear wheel 15 in the left-right direction is arranged parallel to the rear side of the rear axle case 13 to ensure ground clearance below the rear axle case 13 and to prevent the rear axle case 13 from moving. The hydraulic cylinder 50 is protected from obstacles from the front. Further, bolt holes 21 for attaching a bracket 27 to the rear wheel fender 26 and a check member are formed to correspond vertically to the upper and lower surfaces 20a and 20b of the rear axle case 13, respectively, so that the rear axle case 13 is turned upside down. In any case, the rear wheel fender 26 and the check member mounting bracket 27 are mounted at the same position, and the hydraulic cylinder 50 does not interfere with the mounting thereof.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, ■ is a tractor, and its vehicle body 3 is constructed by directly connecting an engine, a transmission case 2, etc., and a hydraulic device 4 having a pair of left and right lift arms 48 on the rear of the vehicle body 3. A seat 6 is provided on the hydraulic system 4 via a mounting base 5.

As shown in FIGS. 8 and 9, the mounting base 5 of the seat 6 is
a support plate 8 fixed on the hydraulic device 4 through the bolt hole 7;
It consists of a strip-shaped stay 9 that is fixed to both left and right sides of the support plate 8 and is long in the front-back direction.

There are three front and rear screw holes 10 and 10' on the front and rear of the stay 9, respectively.
is formed, and by selectively attaching brackets 11 fixed to the seat 6 to the corresponding front and rear screw holes 10 and 10' with ports 12, the seat 6 can be adjusted and fixed in the longitudinal direction.

Further, a rear axle case 13 is provided on both left and right sides of the rear portion of the vehicle body 3.
A rear wheel 15 is mounted so as to be movable in the left-right direction via a rear axle 14 and the like.

As shown in FIGS. 3 to 7, the rear axle case 13 is constructed of a fixed case 16 and a movable case 17 fitted inside the fixed case 16 so as to be slidable in the axial direction. The base 18 side of the fixed case 16 is formed into a bowl shape, and is attached to the transmission case 2 via a brake case 19. Further, the intermediate portion 20 of the fixed case 16 is formed into a substantially rectangular prism shape, and its upper surface 20a and lower surface 20b are formed into a flat shape, and three bolt holes 21 are provided at the front and rear portions of the upper surface 20a and the lower surface 20b, respectively. are formed in the left and right direction. The bolt holes 21 on the upper surface 20a and the lower surface 20b are formed to correspond in the vertical direction. middle part 20
The fender bracket 22 is attached to the port 23 on the upper surface 20a of the
It is installed through. The fender bracket 22 consists of a rectangular cylindrical mounting base 24 that is detachably attached to the fixed case 16 and a top plate 25, and a rear wheel fender 26 is detachably attached to the top plate 25. A bracket 27 for attaching a check member is detachably attached to the lower surface 20b of the intermediate portion 20 via a stud port 28. For mounting the check member, the bracket 27 has a piece 27A projecting downward as shown in FIG. A check chain 27B is attached via a pin 27C or the like. The check chain 27B does not have to be a chain, but may be a bar or a plate, and serves to control (check) the left and right swing of the lower link. Also, fixed case 1
As shown in FIG. 3, a gauge 29 with a scale 32 of the rear wheel 150 wheel width is disposed on the front surface 20G of the intermediate portion 20 of the vehicle 6.
3, it is attached to the fixed case 16. Then, the triangular mark 3 on the instruction plate 30 attached to the movable case 17
1 on the scale 32, the wheelbase of the rear wheel 15 can be seen from the seat 6.

FIG. 10 shows a seal structure between the fixed case 16 and the movable case 17, in which a circumferential groove 33 is formed on the inner peripheral surface of the outer end of the fixed case 16, and a dust seal 35 is fitted into the circumferential groove 33 via a metal ring 34. It is worn. Outer end surface 3 of the metal ring 34
4a is flush with the outer end surface 16a of the fixed case 16,
The lip portion 36 of the dust seal 35 projects outward from the outer end surface of the fixed case 16, and the portion of the lip portion 36 that contacts the movable case 17 has an arc shape. The dust seal 35 scrapes off soil adhering to the outer periphery of the movable case 17 when it contracts, and the scraped soil is guided radially outward of the fixed case 16 along the outer end surface 34a of the metal ring 34. Further, an annular groove 37 for an oil seal is formed inside the circumferential groove 33, and a hack-up ring 38 and a D-shaped tongue 39 are provided within this annular groove 37 without any clearance.

The rear axle 14 consists of a first shaft 40 and a second shaft 41.
The shaft 40 is supported by the stationary case 16 via a bearing 42, and is also supported by the planetary reducer 43 via the planetary reduction gear 43.
It is interlocked and connected to a differential yoke shaft 44 that protrudes from the internal differential device. The second shaft 41 is supported by the movable case 17 via a bearing 46, and is connected to the first shaft 40 via a spline cylindrical shaft 47 fixed thereto with a pin 45. Therefore, the rear axle 14 is expandable and retractable in the axial direction. Further, the rear wheel 15 is attached to the flange portion 48 at the outer end of the second shaft 41.
A disk 49 is attached.

A hydraulic cylinder 50 is arranged parallel to the rear axle case 13 on the rear side of the rear axle case 13.
is housed in a holding case 51 integrally formed with the fixed case 16. By this hydraulic cylinder 50, the rear wheel 15
is moved from side to side to adjust the tread. The hydraulic cylinder 50 is composed of a cylinder body 52 that is slidably fitted into a holding case 51, a piston wand 53 whose position is restricted so that it cannot move in the left-right direction, and the like. The outer end of the cylinder body 52 is connected to the movable case 17 by a connecting member 54 and is closed. Also, between the cylinder body 52 and the piston rod 53, there are first and second oil chambers 5.
5.56 is formed, and hydraulic oil is supplied from the oil passages 57 and 58 to the first
When the oil is supplied to the oil chamber 55, the cylinder body 52 slides outward, and as a result, the movable case 17 and the second
The shaft 41 moves in the same direction, and the rear wheel 15 moves in the same direction. Further, when hydraulic oil is supplied to the second oil chamber 56 from the oil passages 59 and 60, the cylinder body 52 slides inward, and the rear wheel 15 is moved in the same direction. In addition, a hydraulic block 61 fixed on the top link mounting base 62 is attached to the left and right cylinders 50.
Hydraulic oil is supplied to the hydraulic block 61 via the vibro 3, and the hydraulic system 4 is supplied to the hydraulic block 61 via the auxiliary control valve.
Hydraulic oil is supplied from Further, the hydraulic block 61 is equipped with an external hydraulic pressure outlet, and an on-off valve 6 that opens and closes the external hydraulic pressure outlet and the supply port to the hydraulic cylinder 50.
4.65 is provided.

66 is a coupling device for towing a trailer, etc., and the front part is attached to a bracket 7 at the rear lower part of the vehicle body 3, as shown in FIGS. 2 and 11.
) 66A, etc., and is supported by a stay 67 that connects the middle part in the front-rear direction and the upper side of the mission case 2, and the upper part of the stay 67 is bolted to the mission case 2, and the lower end is connected from this upper part to the mission case 2. It is sandwiched in between so as not to interfere with the hydraulic cylinder 50.

(Effects of the Invention) According to the present invention, since the hydraulic cylinder 50 for moving the rear wheel 15 in the left-right direction is provided on the rear side of the rear axle case 13 in parallel thereto, the ground clearance below the rear axle case 13 is increased. can be secured, and there is no risk of damage from obstacles from the front. In addition, the upper and lower surfaces 20a of the rear axle case 13,
Since the bolt holes 21 for attaching the rear wheel fender 26 and the bracket 27 for attaching the check member to the rear wheel fender 20b are formed in correspondence with each other in the vertical direction, the hydraulic cylinder 50 can be attached to the rear wheel fender 26 and the check member for attaching the bracket 27. Also, the rear axle case 13
Since the rear wheel fender 26 and the bracket 27 can be mounted at the same position even if the rear wheel fender 26 and the check member are mounted upside down, it is possible to provide a rear axle case 13 which can be used for left and right use and is equipped with a hydraulic cylinder 50.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a rear view of the I-actor, FIG. 2 is a side view of the same, FIG. 3 is a front view of the main parts, and FIG.
The figure is a cross-sectional view taken along the line IV-IV in Fig. 3, Fig. 5 is a plan view of the main parts, Fig. 6 is an exploded perspective view, and Fig. 7 is a - - - ■ of Fig. 1.
8 is a plan view of the seat mounting base, FIG. 9 is a sectional view taken along the line IX-IX in FIG. 8, and FIG. 10 is an enlarged view of section A in FIG. FIG. 11 is an enlarged view of the coupling device. 1...Tractor, 2...Mission case, 3...
・Vehicle body, 13... Rear axle case, 14... Rear axle,
15... Rear wheel, 16... Fixed case, 17... Movable case, 20a... Top surface, 20b... Bottom surface, 21
... Bolt hole, 22 ... Fender bracket, 26
...Rear wheel fender, 27... Check member installation is with bracket.

Claims (1)

[Claims] (1) Rear wheels 15 are provided on both sides of the rear part of the vehicle body 3 via a rear axle case 13 so as to be movable in the left and right direction, and a rear wheel fender 26 is provided on the upper surface 20a side of the rear axle case 13,
In the tractor in which check member mounting brackets 27 are respectively attached to the b side, a hydraulic cylinder 50 for moving the rear wheel 15 in the left-right direction is provided on the rear side of the rear wheel case 13 in parallel with the rear axle case 13, and A rear wheel fender 26 and a check member mounting bracket 2 are installed on the upper and lower surfaces 20a and 20b of 13.
7. A rear axle case structure for a tractor, characterized in that bolt holes 21 for attaching bolts 7 are formed corresponding to each other in the vertical direction.