JPS63270201A - Front axle housing for riding tractor - Google Patents

Abstract

PURPOSE:To shorten the vertical and lateral size of a butt part, by a method wherein, in relation to a distance between adjacent eight corner parts at which right and left half vision housings are fastened together, a distance in a horizontal or a vertical direction is set to a value higher than a distance in an oblique direction. CONSTITUTION:Butt parts 7a and 7b of a front axle housing 7 for formed in an octagonal shape in which distances La and Lb in a horizontal and a vertical direction between corner parts is increased to a value higher than a distance Lc in a direction extending at an angle of 45 deg. with a horizontal direction between corners, and each corner part is rounded. The corresponding corner parts of the butt parts 7a and 7b are fastened together by means of bolts 41. This constitution enables corner parts (a), (b) and (e), (f), arranged in a horizontal direction, and corner parts (c), (d) and (g), (h), arranged in a vertical direction, to approach to a horizontal line X and a vertical line Y, respectively, to shorten a vertical size B and a longitudinal size A, and enables lowering of a center of gravity, an increase of a height from a ground, and an increase of a lateral swing amount, and permits increase of a steering angle.

Description

Detailed Description of the Invention A6 Objective of the Invention +11 Industrial Field of Application The present invention is directed to a combination of a left housing half that rotatably supports a left front wheel and a right housing half that rotatably supports a right front wheel. The present invention relates to a front axle housing for a riding tractor, which has an octagonal section and whose corresponding corner sections are connected by eight bolts.

(2) Prior Art In such a conventional front axle housing, the abutting portions of the left and right housing halves are formed into a regular octagon.

(3) Problems to be Solved by the Invention In a passenger tractor, when trying to increase the ground clearance of each part, lower the center of gravity of the engine, and increase the steering angle of the front wheels, the abutting portion of the front axle housing is often a hindrance.

Therefore, in the present invention, the abutting portions of both the left and right housing halves are
It is an object of the present invention to provide the front axle housing in which the dimensions of the abutting portion of both housing halves in the vertical direction and easy removal direction can be shortened without reducing the bonding strength of the bolts.

B3 Structure of the Invention (Means for Solving Problem 11) In order to achieve the above object, the present invention provides a structure in which the corner spacing in the horizontal and vertical directions is smaller than the corner spacing in the 45° direction with respect to the horizontal line. A feature is that the abutting portions of both housing halves are formed so as to be larger.

(2) Effect According to the above configuration, by increasing the distance between the corners in the horizontal direction at the abutting portion of both housing halves, the vertical dimension of the abutting portion can be shortened, and the vertical dimension of the abutting portion can be shortened. By increasing the distance between the corners, the longitudinal dimension of the abutting portion can be shortened.

(3) Example Hereinafter, an example of the present invention will be explained with reference to the drawings. In FIGS. 1 and 2, a riding type agricultural tractor 1
has a ladder-type vehicle body frame 2, on which a battery 3, a radiator 4, and an engine 5 are mounted in order from the front.

Further, a front axle housing 7 that rotatably supports a pair of left and right front wheels 6.degree. 6 is supported below the engine 5 by the vehicle body frame 2.

The steering handle 8 for steering the front wheels 6, 6 is connected to the engine 5.
will be installed immediately after.

Further, a transmission case 9 is fixed to the rear end of the vehicle body frame 2. On both the left and right sides of this mission case 9,
A rear axle housing 12.12 is fixedly provided to support an axle 11.11 connected to a pair of left and right rear wheels 10.10.

Inside the transmission case 9 are the clutches 13 in order from the front.
, a transmission 14 , and a rear differential 15 connected to the axle 11 . Protrude and rear power take-off shaft 1
9 protrudes from the rear surface of the case 9.

On the other hand, the front axle housing 7 has an axle 20.2 connected to the front wheels 6, 6, respectively, as shown in FIG.
0 and a front differential 21 that drives them.

A flywheel 23 attached to the rear end of a crankshaft 22 of the engine 5 is connected to the input shaft 16 via a drive shaft 24 and universal joints 25 and 26 at both ends thereof. Further, the first output shaft 17 is connected to the front differential 21 via a drive shaft 27 and universal joints 28 and 29 at both ends thereof, and the second output shaft 21 projects toward the front of the vehicle body frame 2. It is connected to the front power take-off shaft 30 via a drive shaft 31 and universal joints 32 and 33 at both ends thereof.

When the engine 5 is operating, its power is guided from the flywheel 23 to the transmission 14 via the clutch 13.
From this transmission 14, front and rear differential gears 21.15
and is transmitted to the front and rear power take-off shafts 30.19.

In FIGS. 1 and 3, the engine 5 has the following features in order to prevent its vibrations from being transmitted to the vehicle body frame 2 as much as possible:
Several elastic support members 34, 34 are provided on the upper surface of the vehicle body frame 2.
..., and in order to lower the center of gravity of the engine 5 relative to the vehicle body frame 2 as much as possible, the oil pan 35 at the bottom of the engine is supported by the left and right vertical frames 2a of the vehicle body frame 2,
2a.

The bottom wall of this oil pan 35 has a shallow front half 35a and a deep rear half 35b, and a frame-shaped bracket 36 disposed as close as possible to the front half 35a has a plurality of bolts 37. 37... are removably fixed to the lower surfaces of both box frames 2a, 2a.

A pair of front and rear bosses 38.38 with their axes oriented in the Gj1 direction are integrally formed in the left and right center portions of the bracket 36, and the front axle housing 7 is attached to these bosses 38.38.
A pivot shaft 40 that passes through a differential chamber 39 in the front and rear directions, which will be described later.
is supported and fixed.

3 and 6, the front axle housing 7 consists of a left housing half 7L and a right housing half 7R that are divided in the axial direction, and both housing halves 7L,
Abutting portions 7a, 7 are abutted against each other at opposite ends of 7R.
b is formed into a flange shape.

The abutting portions 7a and 7b are formed in a hexagonal shape in which the corner spacing La and Lb in the horizontal and vertical directions are larger than the corner spacing Le in the direction of 45 degrees with respect to the horizontal line. It can be rounded.

Corresponding corner portions of these abutting portions 7a, 7b are connected by eight bolts 41, 41, . . . .

In the abutting portions 7a and 7b, the corner distance La in the horizontal direction is set to the corner distance L in the 45° direction with respect to the horizontal line.
Making it larger than c means corners a and b arranged in the horizontal direction;
e and r approach the horizontal line X passing through the center of the abutting parts 7a and 7b, and as a result, the vertical dimension B of the abutting parts 7a and 7b can be made shorter than that of the conventional regular octagonal abutting part. The engine 5 is connected to the butt portions 7a, 7
The center of gravity can be lowered by bringing it closer to b, and the butt part? a
, 7b can be raised above the ground.

Also, the corner interval Lb in the vertical direction is set to 45 mm with respect to the horizontal line.
Making the corner interval larger than Lc in the @ direction means that the vertically aligned corners c, dHg, and h approach the vertical line Y passing through the center of the abutting parts 7a and 7b, and as a result, the abutting part 7a , 7b can be made shorter than the conventional regular octagonal abutting portion, and therefore the abutting portion 7a.

The longitudinal swing amount of the tie rod R for steering the front wheels, which is disposed immediately before or after the front wheel steering portion 7b, is determined by the abutment portion 7a.

7b, it is possible to increase the turning angle of the front wheels 6, 6 without interfering with the front wheels 7b.

In FIGS. 3 and 5, both housing halves 7L, 7
R is integrally formed with partition walls 42.43 that define a differential chamber 39 that accommodates the front differential device 21, and these partition walls 42.43 have a differential carrier 21a of the front differential device 21.
is supported via a pair of left and right ball bearings 44,44.

Furthermore, bearing bosses 45.45 that rotatably support the pivot shaft 40 are integrally formed on both the front and rear walls of the left housing half 7L, and these bearing bosses 45.4
Annular grooves 47.4 formed on the inner circumferential surface of the outer end of 6, respectively.
7 includes a sealing member 4 that is in close contact with the circumferential surface of the pivot shaft 400.
8.48 is installed. Inside these seal members 48 , 48 , a spiral oil groove 49 is carved in the circumferential surface of the pivot shaft 40 , which communicates the inner circumferential surface of each bearing boss 45 , 46 with the differential chamber 39 .

In order to regulate the swinging angle of the front axle housing 7 around the hipot axis 40 to a constant level, a circular projection 50,50 that comes into contact with the lower surface of the bracket 36 is formed protrudingly on the upper surface of the housing (see FIGS. 3 and 3). (See Figure 4).

Thus, the power transmitted from the first output shaft 17 of the transmission [14] to the front differential device 21 is transmitted to the axle 20, 20 and the front wheels 6, 6.
and drive them.

When the front wheels 6, 6 move over a work site with severe ups and downs, the front axle housing 7 swings up and down around the pivot shaft 40, so that rolling of the vehicle body frame 2 can be reduced.

Furthermore, while the front differential gear 21 is rotating, the lubricating oil in the differential chamber 39 is scattered, and the droplets are transferred to the pivot shaft 4.
Since it enters the oil grooves 49 and 49 of 0 and is held, it effectively lubricates the relative rotation surfaces between the pivot shaft 40 and the bearing bosses 45 and 46, and the vertical swing of the front axle housing 7 is always performed smoothly. can be set.

C1 Effects of the Invention As described above, according to the present invention, the abutting portions of both housing halves are arranged such that the corner spacing in the horizontal and vertical directions is larger than the corner spacing in the 45'' direction with respect to the horizontal line. As a result, the vertical and longitudinal dimensions of the abutting portions of the left and right housing halves can be shortened without reducing the strength of the bolts at the abutting portions of the left and right housing halves.As a result, the ground clearance of the front axle housing can be reduced. This is extremely advantageous in raising the steering angle, lowering the center of gravity of the engine, and increasing the steering angle.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of a riding type agricultural tractor, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along the line III--III of Fig. 1, and Fig. The figure is in Figure 3.
The arrow view, FIGS. 5 and 6 are the V-V line and Vl in FIG. 3.
-Vl line enlarged sectional view. 1... Agricultural tractor as a passenger tractor, 6...
Front wheel, 7...Front axle housing, 7L...
・Left housing half, 7R...Right housing half, 7
a, 7b...butt part, 41...bolt, a w
b...corner, La...corner spacing in the horizontal direction, Lb
... Corner spacing in the vertical direction, Lc... Corner spacing in the 45'' direction with respect to the horizontal line

Claims (1)

[Claims] The abutting portions of the left housing half that rotatably supports the left front wheel and the right housing half that rotatably supports the right front wheel are formed in an octagonal shape, and the corresponding corners of both are connected with eight bolts. In the front axle housing for a riding tractor, which is connected by A front axle housing for a passenger tractor, characterized by forming a