JPH072242Y2 - Axle pipe positioning mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> This invention relates to a positioning mechanism for an axle pipe.

<Prior Art> Conventionally, there is a four-wheel traveling type mobile agricultural machine having a mechanism capable of adjusting the distance between the left and right front wheels according to the work content. FIG. 4 is a partial sectional view of the front center case of the tractor. As shown in the figure, conventionally, an axle pipe 55 is inserted in and out of the case 51 so that the drive shaft 57 in the axle pipe 55 is spline-fitted with the shaft 53 protruding from the differential gear unit. There is. And the axle pipe 55 is the case 51.
It is fixed by the engagement of the locking pin 59 that is inserted through the recess and the recesses 61 that are formed on the peripheral surface of the axle pipe 55.

<Problems to be solved by the invention> However, in the above-mentioned conventional structure, when the left and right gear cases are moved left and right to obtain the required wheel spacing, the friction between the case and the axle pipe is large, and the gear case itself is heavy. Moreover, the axle pipe does not move smoothly, and it is difficult to move the axle pipe accurately to a desired position.

When adjusting using the power steering cylinder, it is difficult for the steering operator to stop the axle pipe at the correct position because he is in the driver's seat.
There is a problem that a plurality of workers are required to accurately inform the moving position of the axle pipe.

<Means for Solving the Problems> The present invention for solving the above problems includes a case 3
The output shaft 7 provided therein and the drive shaft 15 fitted to the output shaft 7 so as to be integrally rotatable and slidable.
And an axle pipe 9 fitted into the case 3 while rotatably supporting the drive shaft 15 therein, a plurality of engaging recesses formed on the outer periphery of the axle pipe 9, and supported on the case 3 side. In the mechanism for positioning the axle pipe 9 by engaging and disengaging the locking members 25, 27 and the engaging recess, each engaging member 25, 27 is engaged with the engaging recess. Fixing recesses 29, 33 capable of fixing the engaging recesses corresponding to the stop members 25, 27 with one locking member 25, 27 and movable recesses 31, 3 allowing the axle pipe 9 to move in the axial direction within a predetermined range.
There are two types of locking members, and the fixed position is such that one locking member 25, 27 is in contact with the end of the movable concave portion 31, 35 and the other locking member 27, 25.
Is engaged with the fixed recesses 29, 33, and the locking members 25,
It is characterized in that 27 are provided at three points which contact the opposite ends of the movable concave portions 31 and 35.

<Operation> Power is transmitted from the output shaft 7 in the case 3 to the drive shaft 15 that integrally rotates. The drive shaft 15 is supported in the axle pipe 9 and slides with the slide of the axle pipe 9. The axle pipe 9 is fitted in the case 3 so that it can be freely taken in and out, and the distance between the left and right wheels is adjusted by taking in and out the axle pipe 9. The case 3 supports the locking members 25 and 27 at regular intervals, and engages with the engaging recess formed in the axle pipe 9 to fix the axle pipe 9 at a predetermined position. When the fixed recessed portions 29, 33 constituting the engaging recessed portions and the locking members 25, 27 are engaged, 1
The axle pipe 9 is fixed by the locking members 25 and 27. When the one locking member 25, 27 is engaged with the fixed recess 29, 33, the other locking member 27, 25 is movable recess 31,
Abutting on the end of 35, both locking members 25, 27 are movable recesses 31,
When located in 35, each locking member 25, 27 has a movable recess 31,
The axle pipe 9 is fixed by the two locking members 25 and 27 which are in contact with the opposite end portions of 35. Then, in order to move the axle pipe 9 from one fixed position to another fixed position, the engagement of the locking members 25, 27 engaged with the fixed recessed portions 29, 33 is released, and the movable recessed portion 35, The locking members 27 and 25 at 31 are the movable recesses.
This can be done by moving until the other end of 35, 31 is abutted, and when both locking members 25, 27 are in the movable recesses 31, 35, one locking member 25 is released. , The other locking member 27 is moved until it comes into contact with the other end of the movable concave portion 35.

<Embodiment> An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partial front sectional view of a front center case of a tractor. The left side case 3 of the front center case is fixed to the lower side of the front bracket 1 and accommodates a transmission system inside. A differential gear device 5 is provided at the center of the front center case, and an output shaft 7 having a spline is projected into the case 3. Further, an axle pipe 9 is slidably fitted into the tip of the case 3, and the axle pipe 9 is attached to the wheel shaft 13
It is fixed to the gear case 11 that supports the axle pipe 9
The wheel width of the front wheels can be changed by putting the case into and out of the case 3.

A hollow drive shaft 15 is rotatably supported by a bearing in the axle pipe 9, and a boss 17 is attached to the tip of the drive shaft 15 so as to be slidably fitted to the output shaft 7. There is. The power output from the differential gear device 5 is transmitted to the drive shaft 15 in the axle pipe 9 via the boss 17, and is transmitted from the bevel gear 19 provided at the other end of the drive shaft 15 to the bevel gear 20 in the gear case 11. Shaft 23, bevel gear 2
1, Driven by the bevel gear 22, the wheel shaft 13 is driven.

Pin-shaped locking members 25, 27 are inserted from the outside into the case 3 at the upper and lower positions, and are fixed at positions where the side surfaces of the locking members 25, 27 overlap the peripheral surface of the axle pipe 9. .
On the other hand, on the peripheral surface of the axle pipe 9, the locking members 25, 27 are provided.
Two engaging recesses are formed at positions corresponding to the engaging members 25 and 27, respectively. When the engaging recesses and the engaging members 25 and 27 are engaged, the axle pipe 9 Has a structure that is fixed in the case 3 without moving. here,
The engaging recesses include fixed recesses 29, 33 and movable recesses 31, 35. The fixed recesses 29, 33 are grooves having an arcuate cross section along the cross-sectional shape of the pin-shaped locking members 25, 27, and one of the locking members 25, 27
The movement of the axle pipe 9 can be restricted only by the engagement of.

Further, the movable recesses 31, provided adjacent to the fixed recesses 29, 33,
35 is formed with a predetermined width in the axial direction of the axle pipe 9, and its end portion has an arc shape along the cross-sectional shape of the locking members 25, 27. Then, as shown in FIG. 2 (A), the fixed concave portions 29, 3
Distance 3 between the movable concave portions 31 and 35 and the groove width l ′ of the movable concave portions 31 and 35
Are the same, and the distances of the locking members 25, 27 in the left-right direction are also the same. In addition, the fixed recesses 29,3 provided above and below
3 and the movable concave portions 31 and 35 are provided in mutually opposite positions.
That is, as shown in FIG. 2 (A), when one locking member 25 is engaged with the fixed recess 29, the other locking member 27
Is in contact with the end of the movable concave portion 35 farthest from the fixed concave portion 33, and the same is true in the reverse case as shown in FIG. 2 (C). Further, as shown in FIG. 2 (B), when both locking members 25 and 27 are inside the movable concave portions 31 and 35, they both contact the end portions of the movable concave portions 31 and 35 and are locked to each other. The opposite surfaces of the members 25, 27 abut. Therefore, in this case, the movement of the axle pipe 9 is restricted by the two locking members 25 and 27.

As explained above, the axle pipe 9 can be fixed at three points (A), (B), (C) in FIG.

As shown in FIG. 3, the locking member 25 is inserted into the case 3 from the outside and is rotatably held. Nut at the tip
25b is attached, is fixed by fastening in the engaged state, and a notch 25a is formed on the side surface. When releasing the engagement by the locking member 25, loosen the nut 25b to release the locking member 2.
5 is rotated so that the notch 25a faces the axle pipe 9. The holding structure of the locking member 25 is the same for the locking member 27.

The operation of the structure of this embodiment described above will be described with reference to FIG. FIG. 2 (A) shows a position where the axle pipe 9 projects to the outermost side. In this state, the axle pipe 9 is fixed by the engagement of the locking member 25 and the fixed recess 29. Next, when narrowing the wheel gap, rotate the locking member 25 to release the engagement, and
Push the axle pipe 9 together with 11 into the case 3. The movement of the axle pipe 9 is stopped when the locking member 27 contacts the end of the movable recess 35. At this time, as shown in FIG. 2 (B), the locking member 25 is located at the end of the movable concave portion 31,
The axle pipe 9 is fixed by rotating the locking member 25 so that the notch 25a faces upward.

Further, when narrowing the wheel width, the engagement of the locking member 27 is released, and the axle pipe 9 is pushed in. When the locking member 25 comes into contact with the end of the movable concave portion 31, the axle pipe 9 is stopped, and as shown in FIG. 2 (C), the locking member 27 is in the corresponding position of the fixed concave portion 33. By rotating the locking member 27, the axle pipe 9 is fixed.

According to the structure described above, when the axle pipe 9 is moved to each fixed position, the axle pipe 9 always surely and accurately stops at each fixed position, so that delicate position adjustment is not necessary and work efficiency is remarkably improved. improves.

<Effect of the Invention> According to the mechanism of the present invention configured as described above, if one of the locking members is disengaged and the axle pipe is slid,
Since it reliably stops at the next fixed position, the fixed position can be easily adjusted, and the distance between the left and right wheels can be adjusted much more easily than before.

In particular, since it is not necessary to perform positioning with a mark or the like, there is an advantage that one operator can easily and reliably adjust the wheel spacing when the axle pipe is taken in and out by operating the power steering.

[Brief description of drawings]

FIG. 1 is a partial front sectional view of a front center case of a tractor, FIG. 2 is a partial sectional view of a case showing fixed positions of an axle pipe, and FIG. 3 is a holding portion of an engaging portion and a locking member of the axle pipe. FIG. 4 is a side sectional view of the case showing the structure, and FIG. 4 is a partial sectional view of the case showing a conventional axle pipe positioning mechanism and showing a use state of the removable detent mechanism. 3: Case, 7: Output shaft 9: Axle pipe, 15: Drive shaft 25, 27: Locking member, 29, 33: Fixed recess 31,35: Movable recess

Claims (1)

[Scope of utility model registration request] 1. An output shaft (7) provided in a case (3), a drive shaft (15) fitted to the output shaft (7) so as to be integrally rotatable and slidable, and the drive shaft (15). An axle pipe (9) fitted into the case (3) while rotatably supporting the inside, and a plurality of engaging recesses formed on the outer periphery of the axle pipe (9),
The locking member (2) is composed of two locking members (25) and (27) supported on the case (3) side and engaged with the engaging recess.
In the mechanism for positioning the axle pipe (9) by disengaging the engaging recesses (5), (27) from the engaging recesses, the engaging recesses corresponding to the respective locking members (25), (27) are engaged. Fixing recesses (29), (33) that can be fixed by the stop members (25), (27)
And two types of movable recesses (31) and (35) that allow the axle pipe (9) to move in the axial direction within a predetermined range, and one locking member (25) and (27) is fixed to the movable recess (31). ), (35)
The other locking member (27), (25) in contact with the end of the other
Is engaged with the fixed recesses (29) and (33), and the engaging members (25) and (27) of both are in contact with the opposite ends of the movable recesses (31) and (35). Axle pipe positioning mechanism with 3 points.