JPH0114483Y2 - - Google Patents

Description

[Detailed description of the invention] The invention provides a removable axle case for a transmission case with drive shafts for mounting wheels protruding from the left and right sides, and the axle case is tilted downward as the side moves away from the drive shaft. The present invention relates to an attachment for mounting a wheel of a walking type mobile agricultural machine, in which a tilted axle is rotatably mounted in the axle case with one end thereof protruding outside, and is interlocked with the drive shaft.

Conventionally, in the above attachment, as shown in FIG. 4, in order to interlock the inclined axle 13 and the drive shaft 8, there is a gap between the opposing ends of the drive shaft 8 and the inclined axle 13.
Meshing part 1 for integrally rotating both shafts 8 and 13
7a and 17b were provided (for example, Jikko Sho 37-
Publication No. 3305).

However, during assembly, the drive shaft 8 and the inclined axle 13
It is difficult to center the meshing parts 17a and 17b.
Both shafts 8 and 13 were not properly engaged.
The disadvantage was that the transmission between them could not be carried out smoothly.

An object of the present invention is to ensure smooth transmission of power between the drive shaft and the inclined axle.

The characteristic configuration of the wheel mounting attachment for a walk-behind mobile agricultural machine according to the present invention is such that, in order to interlock the inclined axle and the drive shaft, an intermediate shaft whose one end is fitted and connected to the drive shaft in a manner that can be freely inserted into and removed from the drive shaft is attached to the axle case. a universal joint portion disposed within the intermediate shaft and interlockingly connecting the other end portion of the intermediate shaft and the inclined axle shaft;
The universal joint includes a cylindrical part on the intermediate shaft, and a spherical part fitted on the inclined axle so as to be in line contact with the entire inner peripheral surface of the cylindrical part. and a single bearing for supporting the intermediate shaft is interposed between the outer circumferential surface of the intermediate shaft and the inner circumferential surface of the axle case at or near a point corresponding to the contact between the spherical part and the cylindrical part. Further, between the intermediate shaft and the inclined axle, a meshing part is formed at a location displaced outward from a contact location between the spherical part and the cylindrical part for integrally rotating both shafts. The functions and effects are as follows.

In other words, the intermediate shaft and the inclined axle can be assembled into the axle case with the cylindrical part and the spherical part formed on both shafts fitted together to align both shafts. When the axle case is attached to and removed from the transmission case, the drive shaft and intermediate shaft are
A bearing that supports the intermediate shaft while being easily connected and detached is interposed between the outer circumferential surface of the intermediate shaft and the inner circumferential surface of the axle case at or near a point corresponding to the contact between the spherical part and the inner cylindrical part. Because of this, the stress that acts in the radial direction between the spherical part and the cylindrical part as it is transmitted from the intermediate shaft to the inclined axle through the meshing part is efficiently absorbed by the bearing. Therefore, center runout of the intermediate shaft due to rotation of the intermediate shaft and the inclined axle can be prevented, and power can be transmitted smoothly. As a result, the transmission efficiency can be improved as a whole, and the durability of the interlocking device between the drive shaft and the inclined axle can be improved due to smooth power transmission.

Hereinafter, embodiments of the present invention will be described based on the drawings.

To configure a walking type mobile agricultural machine, as shown in Fig. 1, a transmission case 4 having a steering handle 3 is fixedly connected to the rear of a frame 2 for mounting an engine 1, and The shaft 5 and the drive shaft 6 of the engine 1 are interlocked via a belt-type transmission 7 which also serves as a main clutch, and the transmission case 4 has drive shafts 8 for mounting wheels on the left and right sides at the center of the width thereof. A protruding transmission case 9 is fixedly connected.

The wheel attachment attached to the transmission case 9 is constructed as follows.

That is, as shown in FIG.
A cylindrical axle case 11 is removably attached via a bolt 10 to a cylindrical axle case 11, which can be inserted into and removed from the square shaft portion 8a of the drive shaft 8, and rotates integrally with the drive shaft 8 when fitted. Rectangular tubular fitting connection part 1
An intermediate shaft 12 having a diameter 2a is provided. Further, a tilted axle 13 is installed so as to be tilted downward toward the side further away from the drive shaft 8.
is rotatable in a predetermined position and posture, and one end protrudes to the outside.
The axle case 11 is supported by bearings 14 of
The other end of the inclined axle 13 is operatively connected to the intermediate shaft 12 through a universal joint 15.

The universal joint portion 15 includes a cylindrical portion 12b on the intermediate shaft 12 and a cylindrical portion 12b on the inclined axle 1.
3 are respectively formed with spherical portions 13a that fit into the cylindrical portion 12b in a state of line contact with the entire inner circumferential surface of the cylindrical portion 12b. In between, the spherical part 13
A bearing 16 that rotatably supports the intermediate shaft 12 in a predetermined position and orientation is interposed at a location corresponding to the contact between the intermediate shaft 12 and the cylindrical portion 12b. Engaging parts 17a and 17b for integrally rotating both shafts 12 and 13 are located between the axle 13 and a position slightly displaced outward from the contact position between the spherical part 13a and the cylindrical part 12b. is formed.

The drive shaft 8 and the inclined axle 13 are provided with pin connection holes 8b and 1 for removably attaching wheels, respectively.
3b is formed through the hole.

FIG. 3 shows another embodiment, in which the spherical portion 13 is attached to the inner peripheral surface of the cylindrical portion 12b of the intermediate shaft 12.
A retaining ring 18 is provided.

[Brief explanation of drawings]

Figure 1 is an overall side view of the walking-type mobile agricultural machine, Figure 2 is a longitudinal sectional front view of the wheel attachment, and Figure 3 is a side view of the walking-type mobile agricultural machine.
The figure is a longitudinal sectional front view of the main part showing another embodiment, and FIG. 4 is a longitudinal sectional front view showing the main part of a conventional wheel mounting attachment. 8... Drive shaft for wheel mounting, 9... Transmission case,
11...Axle case, 12...Intermediate shaft, 12b...
... Cylindrical part, 13 ... Inclined axle, 13a ... Spherical part, 15 ... Universal joint part, 16 ... Bearing,
17a, 17b...meshing portions.

Claims (1)

[Scope of utility model registration request] A removable axle case 11 is provided to a transmission case 9 from which drive shafts 8 for wheel attachment are protruded on the left and right sides. The axle case 11 is rotatably mounted with one end protruding outward.
This is an attachment for attaching a wheel of a walking type mobile agricultural machine, which is attached to the inside of the vehicle and is linked to the drive shaft 8. An intermediate shaft 12 is disposed within the axle case 11, and the other end of the intermediate shaft 12 and the inclined axle 13 are interlocked and connected together. is provided, and the universal joint portion 15 is configured by a cylindrical portion 12b on the intermediate shaft 12.
and the cylindrical part 1 is attached to the inclined axle 13.
2b, the spherical portions 13a are formed to fit in line contact with the entire inner circumferential surface of the intermediate shaft 12, and the spherical portions 13a are formed between the outer circumferential surface of the intermediate shaft 12 and the inner circumferential surface of the axle case 11. A single bearing 16 for supporting the intermediate shaft 12 is interposed at or near a point corresponding to contact with the cylindrical portion 12b, and further,
Between the intermediate shaft 12 and the inclined axle 13, a mesh is provided at a location displaced outward from the contact location between the spherical portion 13a and the cylindrical portion 12b for integrally rotating both shafts 12, 13. An attachment for mounting wheels of a walking-type mobile agricultural machine, which is formed with two parts 17a and 17b.