JPH079743Y2 - Side brake operation structure of work vehicle - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In the present invention, a friction disk of a disk type side brake is fitted onto a differential drive shaft for driving a wheel extended from a differential mechanism so as to be relatively non-rotatable. A side brake operating structure for a work vehicle in which a pressing member that abuts against the friction disc and a shift sleeve that presses the pressing member toward the friction disc are externally fitted and mounted on a transmission shaft so as to be forward / reversely shiftable. .

[Conventional technology]

Conventionally, in a side brake operating structure of a work vehicle represented by, for example, a riding type rice transplanter, a shift disc externally fitted to the transmission shaft is operated to a side brake side, so that a friction disc of the side brake is removed. The brake is applied by abutting action via the pressing member,
Further, by operating the shift sleeve in the reverse direction, the pressing of the pressing member on the side brake is released, and the brake is released.

[Problems to be solved by the invention]

However, according to the above configuration, the friction disc of the side brake is non-rotatably fitted onto the transmission shaft, whereas the shift sleeve and the pressing member are rotatably fitted onto the transmission shaft. Therefore, when the shift fork is operated to the side brake side by the shift fork to bring out the braking state, the rotation of the shift sleeve is lower than that of the transmission shaft due to the friction between the shift fork and the shift sleeve. A rotation difference is generated between the friction disk that rotates integrally with the shaft and the shift sleeve, and a relative rotation difference is generated between the shift sleeve and the pressing member and between the pressing member and the friction disk, and the sliding contact portion is formed. However, there is a drawback that it causes baking and abrasion.

On the other hand, it is conceivable that the cylinder of the pressing member is splined to be fitted on the transmission shaft by spline fitting, but since the splined portion is long, the processing cost is high and the pressing member is There is a drawback that the sliding operation with the transmission shaft increases and the shift operation becomes heavy.

The present invention was made by paying attention to the above situation,
It is an object of the present invention to prevent seizure and wear between members by a rational configuration of the members so that the shift operation of the shift sleeve can be performed with less resistance while reducing the processing cost as much as possible. .

[Means for solving problems]

That is, the characteristic configuration of the side brake operating structure of the work vehicle according to the present invention is that the shift sleeve is fitted onto the transmission shaft so as not to be relatively rotatable, and the pressing member is loosely fitted on the transmission shaft. Is divided into a small-diameter sleeve on the shift sleeve side and a large-diameter sleeve on the friction disc side, and the operation and effect are as follows.

[Action]

Since the shift sleeve is fitted onto the transmission shaft so as not to be relatively rotatable and the pressing member is loosely fitted on the transmission shaft, the pressing member is sandwiched between the shift sleeve and the friction disc of the side brake in the braking state. Since the shift sleeve and the friction disc rotate together, there is no relative rotation between the shift sleeve and the pressing member and between the pressing member and the friction disc. Moreover, it is only necessary to form the spline on the shift sleeve, and it is not necessary to form the spline on the elongated pressing member.

[Effect of device]

As a result, it has become possible to reduce the processing cost as much as possible while preventing seizure or wear between the respective members, and to suppress the resistance during the shift operation of the shift sleeve as much as possible.

Furthermore, since the pressing member is composed of a small-diameter sleeve on the shift sleeve side and a large-diameter sleeve on the friction disc side, the contact area of the brake is secured by reducing the surface pressure on the friction disc, and a good braking action is exhibited. And, moreover,
When the distance between the shift sleeve operated by the shift fork and the disc brake is different, it can be easily dealt with by changing the small-diameter sleeve on the shift sleeve side to a different length.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

Fig. 2 shows a passenger rice transplanter as a work vehicle. This passenger rice transplanter is equipped with an engine (1) and a mission case at the front of the passenger car body which is pivotally supported by front and rear wheels (26) (27). (2) is provided, a driver's seat (3) is provided in the middle, and a seedling stand (6) and planting are provided at the rear of the vehicle body via a link mechanism (5) that can be raised and lowered by a hydraulic cylinder (4). A seedling planting device (9) including a mechanism (7), a grounding float (8) and the like is interlocked and connected.

The planting mechanism (7) rotatably supports a planting case (12), in which planting claws (11) and (11) are pivotally attached to both ends, at the rear of the planting mission case (10). The planting claws (11), (11) are configured in accordance with the rotation drive of the planting case (12).
The seedlings are alternately cut from the seedling take-out port (6a) of the seedling stand (6) and planted in the field.

The one of the planting claws (11) is configured so that the mounting posture can be changed to the inner side of the center of rotation of the planting case (12), and the trail of the claw tips can be removed from the seedling take-out port (6a). The transverse feed speed of the seedling stand (6) can also be switched to half, and the seedlings can be planted in the field at rough front-to-back intervals (between plants) with only one planting claw (11). It is like this.

A transmission case (13) in which a transmission shaft (14) for the rear wheel (27) is installed is provided at the rear part of the vehicle body, and the structure inside the transmission case (13) will be described below.

As shown in FIG. 1, a transmission case (13) is internally provided with a differential case (33) constituting a differential mechanism (25), and a bevel gear (34) externally fitted to the differential case (33) is provided with the engine ( The bevel gear (32) fitted to the rear end of the input shaft (22) from 1) is engaged. The differential case (3
Inside 3), side gears (35), (35) and pinion gears (36), (36) are installed respectively, and side gears (35)
The differential transmission shafts (14) and (14) externally fitted with the spline are extended to the left and right, and the left and right rear wheel gear cases (28) and (28) are passed through the transmission shafts (14) and (14). Is configured to be transmitted to.

Square shafts (16) and (16) are formed on the outer ends of the left and right transmission shafts (14) and (14), and the friction discs (15) of the disc type side brakes (15) are formed on the respective square shafts (16). 15a) is fitted so as not to rotate relative to it and to be slidable in the axial direction. This side brake (15) and the differential case (33)
Between the transmission shaft (14), shift sleeves (19), (20) slidable in the axial direction are fitted on the spline outside, and the shift sleeves (19), (20) and Pressing members (17) and (18) are loosely fitted between the side brakes (15) and (15) so as to be movable in the axial direction.

Of the left and right shift sleeves (19) and (20), the right shift sleeve (20) has a claw part (20a) that can be engaged and disengaged with the differential case (33), and a right side brake pedal (21). An engaging portion (20b) for engaging with a shift fork (24) operated by an operating shaft (23) linked thereto, and a pressing member (1
The contact sleeve part (20c) to the 8) is formed.

Also, the pressing member (18) on the side of the shift sleeve (20)
As shown in FIG. 1, it is composed of a cast cylindrical body in which the large diameter portion (18a) is formed on the friction disc (15a) side, and the spline is not formed in the cylinder. .

Therefore, when the right side brake pedal (21) arranged on the driver's seat (3) is depressed, the operation shaft (2
3) rotates, the right shift sleeve (20) moves to the disc brake (15) side, and the friction disc (15a) is pressed by the pressing member (18). Can be revealed.

Further, when the shift sleeve (20) is moved to the differential case (33) side by rotating the operation shaft (23) in the opposite direction, the claw portion (20a) of the shift sleeve (20) is moved to the differential case (33).
The deflocculation state can be revealed by the occlusion of the.

Further, a shift sleeve (19) is spline-fitted to the transmission shaft (14) on the left side of the drawing, and a pressing member (17) is loosely fitted to the transmission shaft (14). This pressing member (17)
It is composed of a small-diameter sleeve (17a) formed in a cylindrical shape and a large-diameter sleeve (17b) with the same specifications as the pressing member (18) on the right side, and each of the sleeves (17a) and (17b) is made by casting. It is formed, and the inside of the cylinder is not splined.

Therefore, when the left brake pedal (21) is depressed, the shift sleeve (19) moves to the disc brake (15) side in the same manner as described above, and the pressing members (17a), (1
By pressing the friction disk (15a) via the 7b), the braking state can be revealed, and the pressing members (17a) and (17b) are shifted by the shift sleeve (19).
And the friction disc (15a) sandwiched between the transmission shaft (14)
By rotating at a constant speed with the shift sleeve (19),
No wear or seizure occurs between the pressing members (17a), (17b) and the disc brake (15).

[Another embodiment]

In the above embodiment, one of the left and right shift sleeves (19) (20) has a differential case (33) on one of the shift sleeves (20).
Although the claw part (20a) that occludes is provided to be diff lockable, both the left and right shift sleeves (19) and (20) may be configured so as not to diff lock. Further, the above-mentioned embodiment can be applied to other agricultural work vehicles other than the riding rice transplanter.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a side brake operating structure for a work vehicle according to the present invention. Fig. 1 is a sectional view of a main part, and Fig. 2 is a side view of a riding type rice transplanter. (14) …… Transmission shaft, (15) …… Disc side brake, (15a) …… Friction disc, (17) …… Pressing member,
(17a) …… Small diameter sleeve, (17b) …… Large diameter sleeve,
(19) …… Shift sleeve, (25) …… Differential mechanism.

Claims (1)

[Scope of utility model registration request] 1. A disc type side brake (15) is provided on a differential drive shaft (14) for driving a wheel, which is extended from a differential mechanism (25).
The friction disk (15a) of the above is fitted onto the friction disk (15a) such that the friction disk (15a) cannot be rotated relative to the friction disk (15a), and the pressing member (17) is attached to the friction disk (15).
A side brake operating structure for a work vehicle in which a shift sleeve (19) that is pressed to the a side is externally fitted and mounted on a transmission shaft (14) so that the shift sleeve (19) can be shifted forward and backward, and the shift sleeve (19) is transmitted. The pressing member (17) is loosely fitted onto the shaft (14) in a relatively non-rotatable manner, and the pressing member (17) is loosely fitted on the transmission shaft (14). Further, the pressing member (17) has a small diameter on the shift sleeve (19) side. A side brake operation structure for a work vehicle that is divided into a sleeve (17a) and a large-diameter sleeve (17b) on the friction disc (15a) side.