JPH04221231A - Axle housing for tractor - Google Patents

Abstract

PURPOSE:To reduce the diameter of an axle housing in which a differential gear, bevel gear, etc., are installed. CONSTITUTION:A recessed part 36 is formed on the outer peripheral part of an axle housing 1 between a differential case 3 in which a differential gear 2 is installed and a bevel gear 4 which is integrally formed in separation to one side from the differential case 3. Accordingly, an interlocking shaft 24 for taking out power, and so on, can be set close.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle housing for a tractor, and is intended to reduce the diameter of the outer periphery of a differential case or the like in which a differential gear of the axle housing is housed.

0002

[Prior Art and Problems to be Solved by the Invention] A differential case houses a differential gear inside and integrally has a large diameter bevel gear that meshes with a bevel pinion gear on the input shaft side. The diameter of the central part of the axle housing that covers these outer peripheries is difficult to reduce (Japanese Patent Laid-Open No. 60-1
For this reason, the lower part of the differential case of the axle housing is likely to touch the ground when the vehicle is traveling, and when working while traveling on a soft soil surface, such as a tractor, or on a soil surface that has ridges or grooves. It is easy to get in the way.

0003

[Means for Solving the Problems] The present invention provides a differential case 3 inside a differential gear 2 which is mounted in an axle housing 1.
and a bevel gear 4 that is integrally provided apart from the differential case 3 to one side.
A bevel pinion gear 6 of the input shaft 5 is provided which is interlocked from the outside of the input shaft 5 and meshes with the bevel gear 4.
The axle housing of the tractor has a structure in which a recessed part 36 is formed by recessing the outer peripheral part of the axle housing 1 between the bevel gear 4 and the axle housing 1.

0004

[Operation and effects of the invention] When the bevel pinion gear 6 is rotated by the rotation of the input shaft 5, the bevel gear 4 and the differential case 3 integrated therewith are rotated, and the left and right differential shafts in the axle housing 1 are rotated. Interlock and interlock the wheels. The differential case 3 and the bevel gear 4 in the axle housing 1 are spaced apart in the axial direction, and the bevel pinion gear 6 of the input shaft 5 is positioned in the space between them, and the bevel gear 4 is meshed and interlocked. A recessed portion 3 is formed on the outer periphery of the axle housing 1 between the differential case 3 and the bevel gear 4.
6, the diameters of the differential case 3 and the bevel gear 4 can be made small, and other members, such as an interlocking shaft for power extraction, can be brought close to the recessed part 36. The ground clearance of this axle housing 1 portion can be maintained high, and the volume can be reduced. Further, the differential case 3 and the bevel gear 4 are arranged on the left and right sides with the bevel pinion gear 6 in the center between them, and members such as the interlocking shaft that approaches the recessed part 36 are also located in the center. By lowering the center of gravity, the left and right balance of the axle housing 1 can be improved.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated example, the present invention is applied to a rear axle housing 1 of a tractor. The rear axle housing 1 has V-shaped brackets 12 integrally molded on both left and right ends, and has left and right vertical frames 13 that constitute the vehicle body 7.
It is attached to the lower side of an axle bracket 14 integrally protruding from the outer surface at the rear portion with a fastener 15 such as a bolt. A mounting seat 8 is formed on the outside of this axle housing 1, and the mounting portion 16 of the final case 10 is directly overlapped with or without the interposition of a cylindrical spacer case 9, and a fastener such as a bolt is attached. Tighten and install with 17.

In the center of the rear axle housing 1, there is an input bearing 18 for transmitting input from the input shaft 5 from the front side.
is provided, and the bevel pinion gear 6 of the input shaft 5 is positioned therein. A differential case 3 and a bevel gear 4 are located on both left and right sides of this bevel pinion gear 6, and a differential gear 2, left and right differential shafts 20, 21, etc. are provided in the differential case 3, and the differential case 3 is provided with a differential gear 2, left and right differential shafts 20, 21, etc. 3 is extended in the direction of the bevel pinion gear 5, and a bevel gear 4 is provided on the outer periphery so as to rotate together with the bevel gear 4. The left and right end portions of the differential case 3 are supported by bearings 22 and 23 relative to the rear axle housing 1, and the differential shafts 20 and 21 extend outward within the rear axle housing 1.

The outer upper circumference of the portion of the rear axle housing 1 facing the bevel pinion gear 6 is recessed in an arc shape, and the power take-off shaft 1 is installed above the recess 36.
It is configured such that the interlocking shaft 24 interlocking with the working machine can be brought closer to the working machine from the 9. A friction brake disc 11 can be accommodated in the mounting seats 8 at both left and right ends of the rear axle housing 1 , and a brake cam 26 rotatably operated by a brake arm 25 is attached to the friction brake disc 11 .
is pressed against the rear axle housing 1 to brake the rotation of the differential shaft 20 or 21. This brake arm 25 is connected to each brake pedal 2 on the control floor 27.
8.

The spacer case 9 is interposed between the rear axle housing 1 and the mounting portion 16 of the final case 10, and is used to widen the distance between the left and right rear wheels 29. In this case, the differential shafts 20 and 21 have different lengths, and although differential shafts 20 and 21 having different lengths may be prepared, in the illustrated example, the tips of the differential shafts 20 and 21,
A coupling 33 connects the bevel gear 31 to the gear shaft 32 of the bevel gear 31 which is supported by a bearing part 30 at the center of the mounting part 16 of the final case 10 so as to interlock with each other.

Furthermore, this gear shaft 32 is detachable, and when the spacer case 9 is removed and the mounting portion 16 is directly connected to the seat 8, the gear shaft 32 is removed from the bevel gear 31 and the coupling 33 is also removed. In the removed state, the shaft holes of this bevel gear 31 are directly spline-fitted to the tips of the differential shafts 20 and 21, so that they can be interlocked. Further, this bevel gear 31 meshes with a bevel gear 34 inside the final case 10 and is interlocked with the rear wheel shaft 35 of the lower rear wheel 29 via an interlocking mechanism.

In attaching the rear axle housing 1 to the vertical frame 13, a V-shaped bracket 12 is attached.
When attached to the axle bracket 14, a gap 37 is formed between the vertical frame 13 and the lower surface of the vertical frame 13, and the brake arm 25 of the brake cam 26 is rotated in this gap 37. 13 and bracket 1
The structure is such that the second part does not get in the way of the brake arm 25.

A base 41 of a connecting arm 40 having a hitch 39 for connecting a working machine at the rear end is connected to a connecting pin 42 between the input bearing 18 of the rear axle housing 1 and the pin receiving portion 38 on this side. Connect with. This connecting arm 4
0, the base portion 41 is bent downward, and the hitch 39 portion is directed rearward from the front side of the rear axle housing 1 through the upper side.

A pair of left and right lift cylinders 43 that move the connecting arm 40 up and down around the connecting pin 42 are provided inside the U-shaped cross section along the rear end of the vertical frame 13. The rear end is pin 44
The distal end of a piston 45, which is pivotably supported to be vertically movable and can be extended and retracted by hydraulic pressure, is pivotally attached 46 to the base 41 of the connecting arm 40.

In the tractor body 7, a front axle bracket 47 is attached to the front end of the vertical frame 13, and a front axle housing 48 is supported on the lower side so as to be able to roll freely around a center pivot 49 at the center of the left and right sides. A differential device that is interlocked with the drive shaft 51 of the transmission case 50 on the rear side is installed in the center of the housing 48, and from this differential device, the front wheel axles 52 on both sides are interlocked through the left and right differential shafts. , the front wheels 53 are driven to travel. Further, these front wheels 53 are similar to the rear wheels 2
9 etc., the steering is interlocked with the steering operation of the steering handle 54. Note that this steering can also be switched to a front wheel steering mode in which only the front wheels 53 can be steered.

Above the front axle bracket 47, an engine 55 is mounted with a drive shaft 56 facing downward, and an input shaft protrudes above the transmission case 50 attached to the rear vertical frame 13 and horizontal frame 57. 58
A belt 59 transmits power between the drive shaft 56 and a pump shaft 61 of a hydraulic pump 60 for the orbit roll.

A travel drive shaft 64 is provided on the rear side of the transmission case 50, which is interlocked with the input shaft 5 of the rear axle housing 1 through an interlocking shaft 63, and which is interlocked with the rear wheel 29.
A power take-off drive shaft 66 is provided that connects an interlocking shaft 65 for interlocking with the power take-off shaft 19 . This power take-off shaft 19
The transmission case 67 bearing the transmission case 67 is attached to the horizontal frame 57 below the cockpit 68, and has a transmission inside thereof that changes the speed of the interlock from the interlock shaft 65.

The driver's seat 68 is mounted on a support frame 69 erected on the rear of the vehicle body 7, and a fuel tank 70 for the engine 55 is provided below the driver's seat 68. In addition, a chemical solution tank 71 having a U-shape in plan view can be mounted so as to fit over the left and right sides of the cockpit 68 to the rear side, making disinfection work, irrigation work, etc. convenient. There is. In addition,
72 is an input shaft on the working machine side connected to the connecting arm 40;
This input shaft 72 and the power take-off shaft 19 of the transmission case 67
An interlocking shaft 24 is provided in the front-rear direction facing the upper side of the recessed part 36 in the center of the rear axle housing 1, and when the connecting arm 40 is moved downward by the lift cylinder 43, this The interlocking shaft 24 can be fitted into the recess 36 and approached. 73 is a bonnet, and 74 is a clutch pedal in front of the control floor 27.

Although the present invention has been exemplified as being applied to the rear axle housing 1, it can also be applied to the front axle housing 48.

[Brief explanation of the drawing]

The figure shows one embodiment of the invention.

FIG. 1 is a schematic cross-sectional plan view of a rear axle housing portion.

FIG. 2 is a plan cross-sectional view of the rear axle housing portion.

FIG. 3 is a partial side view.

FIG. 4 is a partially enlarged side view.

FIG. 5 is a partial perspective view.

FIG. 6 is a rear sectional view of the rear portion of the vertical frame.

FIG. 7 is a side view of the entire device.

FIG. 8 is a partial plan view.

FIG. 9 is an overall plan view.

[Explanation of symbols]

1 Axle housing 2 Differential gear 3 Differential case 4 Bevel gear 5 Input shaft 6 Bevel pinion gear

Claims (1)

[Claims] 1. A differential gear 2 is provided between a differential case 3 inside a differential gear 2 that is shaft-mounted in an axle housing 1 and a bevel gear 4 that is integrally provided and spaced apart from the differential case 3 to one side. a bevel pinion gear 6 of the input shaft 5 that is interlocked from the outside of the axle housing 1 and meshes with the bevel gear 4;
The axle housing for a tractor is provided with a recessed portion 36 formed by recessing the outer peripheral portion of the axle housing 1 between the differential case 3 and the bevel gear 4.