JPH0334340Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention arranges a plurality of output gears having different drive rotational speeds concentrically in a power take-off case, and selectively engages the output gears. The present invention relates to a power take-off device for a working vehicle, in which a plurality of types of power take-off shafts are configured to be freely inserted and removed.

[Conventional technology]

In the above-mentioned shaft-exchangeable power take-off device, an example of a structure for preventing the power take-off shaft from coming off is the
It is disclosed in Publication No. 57-100529, but this is C
This type of stopper ring was fitted into a groove provided on the inner peripheral surface of the shaft holder, but the following problems occurred during use.

[Problem that the invention attempts to solve]

When attaching and detaching the stopper ring to replace the power take-off shaft, it is necessary to use a special tool to elastically deform the stopper ring while attaching and detaching it to the inner circumferential groove of the shaft holder. The work was extremely troublesome, and the stopper ring would sometimes fly off and cause powder to be lost.

An object of the present invention is to construct a retaining mechanism that allows the power take-off shaft to be easily replaced in a shaft-exchangeable power take-off device for a work vehicle.

[Means for solving problems]

The feature of the present invention is that in the above-mentioned power take-off device for a working vehicle, a rotatable cylindrical shaft holder is attached in a protruding state to the rear end of the power take-off case housing the power take-off device, and the outer circumference of the power take-off shaft is A shaft-shaped retaining member that can be inserted and removed in a direction perpendicular to the axial direction of the power take-off shaft and fixed while engaging with the shaft holder is attached to the protrusion of the shaft holder, and its functions and effects are as follows. It is as follows.

[Effect]

When the shaft-shaped retaining member is inserted and fixed into the protrusion of the shaft holder in a direction perpendicular to the axial direction, a portion of the retaining member engages with the outer circumference of the power take-off shaft, preventing the power take-off shaft from coming out. At the same time, the shaft holder and the retaining member begin to rotate together with the power take-off shaft. Further, the retaining member can be inserted into and removed from the protruding portion of the shaft holder that protrudes outside the power extraction case from outside the shaft holder.

[Effect of idea]

As explained above, in the power take-off device for a working vehicle, it was possible to construct a retaining mechanism that can perform a sufficient function with the simple operation of inserting and removing the shaft-shaped retaining member from the outside of the shaft holder.

In addition, since the retaining member is not elastically fitted, there is no risk of powder being thrown away when attached or detached.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An agricultural tractor that is an embodiment of the present invention will be described below with reference to the drawings.

As shown in Fig. 4, the engine 3, main clutch housing 4, and transmission case 5 are directly connected to the aircraft body supported by the front wheels 1, 1 and the rear wheels 2, 2, and the control section is located in the center. 6 to constitute an agricultural tractor.

To explain the power transmission system from the engine 3 in detail, as shown in FIG.
0, forward and reverse rotation is performed, and then the gears are changed by the 4-stage main transmission mechanism 11 and the 2-stage auxiliary transmission mechanism 12 and sent to the rear wheel differential mechanism 13, and the front wheel output shaft 14 and the front wheel transmission hydraulic pressure are It is sent to the front wheel differential mechanism (not shown) via the clutch 15. Next, the power to the working equipment installed at the rear of the aircraft is from engine 3.
The power is sent to the power take-off device 34 via the first power take-off shaft 7, the PTO transmission hydraulic clutch 16, and the second power take-off shaft 17, which are directly connected to the power take-off shaft 7, the gear is changed, and the power is sent to a working device (not shown).

Next, we will explain in detail the power take-off device 34, which is an exchangeable shaft type and can be shifted in two stages, high and low, to which the present invention is applied.As shown in FIG. The drive shaft 1 is fitted and connected to the second power take-off shaft 17 in a dual-supported manner by a power take-off case 35 and a bearing portion 35a attached thereto.
8 is pivotally supported, and drive gears 18a and 18b are fixed to this drive shaft 18.

Also, an output gear 19 that meshes with the drive gears 18a and 18b and has a spline portion on the inner surface of its boss portion.
a, 19b are arranged concentrically in parallel, and a cylindrical shaft holder 20 is installed near the rear end of the power take-off case 35.
is rotatably installed concentrically with the output gears 19a, 19b and with a portion protruding to the outside.

Two types of power take-off shafts 37 having different spline portion positions are connected to the output gear 1 in this power take-off device 34.
It is inserted while selectively engaging the spline portions of 9a and 19b, and the speed is changed by exchanging the shafts. FIG. 1 shows a state in which the power take-off shaft 37 that engages with the spline portion of the output gear 19a is installed.
Power is transmitted to the power take-off shaft 37 at low speed via the drive gear 18a and the output gear 19a.

As shown in FIGS. 1 and 2, the power take-off shaft 37 retaining structure is such that a bolt/nut, which is an example of a shaft-shaped retainer member 21, is inserted in a direction perpendicular to the axis of the power take-off shaft 37, and , is attached to the rear end protrusion of the shaft holder 20 so as to engage with the shoulder of the power take-off shaft 37.

[Another example]

In the above embodiment, the retaining member 21 is provided with a bolt.
Although a nut is used, a structure using a headed pin and a β pin for preventing removal may be used instead.

[Brief explanation of the drawing]

The drawings show an embodiment of the power take-off device for a working vehicle according to the present invention, and FIG. 1 is an overall side view of the power take-off device, FIG. The figure is an overall schematic side view of the transmission, and FIG. 4 is an overall side view of the agricultural tractor. 19a, 19b...Output gear, 20...Shaft holder, 21...Keeping member, 35...Power extraction case, 37...Power extraction shaft.

Claims (1)

[Scope of utility model registration request] Multiple output gears 19 with different drive rotational speeds
A, 19b are arranged concentrically in a power take-off case 35, and a plurality of types of power take-off shafts 37, 37 selectively engaged with the output gears 19a, 19b are configured to be freely inserted and removed. A power take-off device,
A rotatable cylindrical shaft holder 20 is attached to the rear end of the power take-off case 35 in a protruding state, and is rotated in the axial direction of the power take-off shafts 37, 37 while engaging with the outer periphery of the power take-off shafts 37, 37. A power extraction device for a working vehicle, in which a shaft-shaped retaining member 21 that can be inserted and removed in orthogonal directions and fixed is attached to a protrusion of the shaft holder 20.