JPH0538902A - Axle housing of tractor - Google Patents

Abstract

(57) [Summary] [Purpose] The movable axle pipe 5 is smoothly adjusted by interposing the metal sleeves 2 at both ends of the axle housing 1 and allowing the movable axle pipe 5 to expand and contract. Can be formed with a small diameter with respect to the axle housing 1 to increase the steering angle. [Structure] Metal sleeves 2 are fitted to both left and right ends of an axle housing 1. In this metal sleeve 2,
A movable axle pipe 5 is slidably inserted into a final case 4 having wheels 3 mounted thereon. On the outer side of the metal sleeve 2, an adjusting fixture 6 for adjusting the movable axle pipe 5 to expand and contract is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor axle housing.

[0002]

2. Description of the Related Art As a structure for adjusting a tread of a tractor, a movable axle pipe on a wheel side is directly fitted inside an axle housing so that a telescopic position can be adjusted. .. However, since the differential gear mechanism has to be inserted into the central portion of the axle housing from one end portion of the axle housing, the diameter of the axle housing must be set to a predetermined size. Along with this, it is useless to increase the diameter of the movable axle pipe on the wheel side that fits into the axle housing, and it is easy to be restricted by the steering angle, etc., especially when steering like a front wheel. Become.

[0003]

According to the present invention, a metal sleeve 2 is fitted to both left and right ends of an axle housing 1, and a wheel 3 is axially mounted in the metal sleeve 2 for transmission. The case 4 has a structure in which an axle housing of a tractor is formed, in which a movable axle pipe 5 for connection is inserted, and an adjusting fixture 6 for adjusting the movable axle pipe 5 to extend and contract is provided outside the metal sleeve 2.

[0004]

[Operation and effect of the invention] When adjusting the tread,
By operating the adjusting fixture 6, the movable axle pipe 5 can be slid with respect to the metal sleeve 2 to change the tread. By interposing this metal sleeve 2, the axle housing 1 and the movable axle pipe 5
The diameter difference between the movable axle pipe 5 and the movable axle pipe 5 on the wheel 3 side can be reduced to increase the steering angle of the wheel, and the metal sleeve 2 allows the movable axle pipe 5 to move relative to the axle housing 1. Sliding can be smoothly performed.

[0005]

1 to 5, the structure of a front axle housing 1 in which front wheels 3 of a tractor are axially mounted will be described. In the front axle housing 1, bearing seats 9 and 10 for receiving the bearings 7 and 8 are protruded inward at a central portion in the longitudinal direction formed in a pipe shape. The bearing 7 has a smaller diameter than the other bearing 8, and accordingly, the inner diameter of the bearing seat 9 is also smaller than that of the other bearing seat 10. Further, connecting ribs are projected on both left and right ends.

A central portion of the front axle housing 1 is swingably supported by a center pivot with respect to a bracket 12 mounted on the front portion of the tractor vehicle body, and a front wheel drive shaft passing through the central portion of the center pivot. 13 drives the differential gear mechanism 15 housed in the front axle housing 1 via the drive gear 14. The differential gear mechanism 15 includes a pair of left and right differential gears 1 inside a differential case 16 having a diameter smaller than that of the bearing 8.
7, 18 are provided inside, and a gear 19 that meshes with the drive gear 14 is provided on the bearing seat 9 side of the differential case 16.
The axles 20 and 21 extending to the left and right sides of the differential case 16 can be differentially rotated by the differential gears 17 and 18.

Such a differential gear mechanism 15 is inserted from the end of the front axle housing 1 on the side of the bearing seat 10 having a small diameter, the bearing 7 is fitted in the bearing seat 9, and the bearing 8 is seated in the bearing seat 10. Fit in 10 and install. The metal sleeves 2 are fitted to the left and right ends of the front axle housing 1, and a cylindrical movable axle pipe 5 can be fitted to the inner periphery along the axial direction, and the outer periphery has the front sleeve. A rib 23, which is joined to the rib 11 protruding from the tip of the axle housing 5 and can be fixed by tightening with a bolt 22, is formed, and an adjusting rod 25 having locking grooves 24 formed at appropriate intervals is inserted in parallel with the axle 21. Then, the adjusting piece 27 having the pin hole 26 through which the locking pin engaged with the locking groove 24 is inserted is formed.

A disk 28 is integrally attached to the outer peripheral portion of the outer end of the movable axle pipe 5, the outer end portion of the adjusting rod 25 is attached to the disc, and the outer surface is provided with a vertical shaft 29 inside. The ribs 31 of the vertical case 30 are tightened and fixed by the bolts 47. The vertical shaft case 30 and the vertical shaft 29 extend along the direction of the kingpin, and the final case 4 around which the wheel shaft 32 is mounted is rotatably supported by a bearing 33 around the lower portion of the vertical shaft case 30. .. In these cases 30 and 4, the wheels 3 from the axles 20 and 21 are provided.
As a power transmission mechanism for transmitting the vertical shaft 29, the gears 34 at the end portions of the axles 20 and 21 are meshed with the gear 35 of the vertical shaft 29.
The gear 36 is meshed with the gear 37 of the wheel shaft 32.

Reference numeral 38 denotes an oil supply plug provided at one end of the front axle housing 1 for supplying oil into the front axle housing 1. A knuckle arm 39 is provided integrally with the mounting seat 54 of the final case 4. The knuckle arm 39 is connected to the pitman arm 43 of the power steering by a rod 44, and the knuckle arms 39 of the left and right final cases 4 are connected by tie rods 40. The pitman arm 43 is rotated by the power steering. When dynamically operated, the left and right front wheels 3 are steered via the rod 44, the tie rod 40, and the like.

Reference numeral 41 is a fixing pin which can be inserted into a pin hole 45 at the upper end of the final case 4, and is a vertical case 30.
By fitting into the recessed portion 42 protruding from the steering wheel, the steerable final case 4 can be locked at the neutral position in the straight-ahead state and fixed in the unsteerable state. The fixing pin 41 is also used as the fixing pin 46 of the pin hole 26 that is a part of the adjusting fixture 6 for adjusting the tread, and is commonly used.

When adjusting the tread, one of the left and right fixing pins 46 is pulled out from the pin hole 26 and the adjusting lot 25 is slidable with respect to the adjusting piece 27, and the fixing pin 46 is fixed. The pin 41 is inserted over the recess 42 and the pin hole 45. In this state, if the pitman arm 43 is rotated α by power steering,
By fixing the rotation of the final case 4 by the fixing pin 41, the vertical case 30 and the movable axle pipe 5 are moved A in the axial direction, and the front wheel 3 on one side is moved.
Is tread adjusted. When adjusted to the proper position A,
If the fixing pin 46 is removed and inserted into the pin hole 26, the movement of the adjusting rod 25 can be fixed. Similarly, tread adjustment of the front wheel 3 on the opposite side can be performed.

Further, in such tread adjustment, a pin hole 45 and a concave portion 42 are provided in order to set the position of the fixing pin 41 at a steering position B which is a proper angle cut from the neutral position N of the final case 4. As a result, the effective rotation angle β of the knuckle arm 39 by the pitman arm 43 for adjusting the tread as described above can be increased, and the tread adjustment can also be increased from B to A.

6 and 7, the bearing portion of the wheel shaft 32 in the final case 4 is provided with an oil seal 49 on the outside of the bearing 48. The upper edge 50 of the inner case 4 has a long outer side. To the wheel mounting edge 51 of the wheel shaft 32, and the lower end is an open portion 52, so that mud flowing down from the upper side does not stagnate outside the oil seal 49 and is easily moved downward from the open portion 52. It is configured to be discharged to. 53 is a color.

[Brief description of drawings]

 The figures show an embodiment of the invention.

FIG. 1 is a front sectional view.

FIG. 2 is a front sectional view.

FIG. 3 is a plan view of a part thereof.

FIG. 4 is a partial plan view.

FIG. 5 is a partial plan view.

FIG. 6 is a partial front cross-sectional view showing another embodiment.

FIG. 7 is a perspective view of a part thereof.

[Explanation of symbols]

 1 Axle housing 2 Metal sleeve 3 Wheels 4 Final case 5 Axle pipe 6 Adjustment fixture

Claims (1)

[Claims] 1. The left and right ends of the axle housing 1 are
A metal sleeve 2 is fitted into the metal sleeve 2, and a movable final case 4 for axially transmitting a wheel 3 from the outside is inserted into a movable axle pipe 5 that connects the final case 4 to the outside of the metal sleeve 2. An axle housing for a tractor provided with an adjusting fixture 6 for adjusting the extension and contraction of the axle pipe 5.