JPH0764203B2 - PTO shaft device for tractor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a PTO shaft device for a tractor.

(Prior Art) A tractor for agriculture or the like is usually equipped with a rear PTO shaft projecting from the rear of the vehicle body, and can drive a working machine such as a rotary tiller, a weeding machine, or a spreader mounted on the tractor. .

However, in recent years, in order to be used for complex work on a tractor, there is a vehicle equipped with a PTO shaft (hereinafter also referred to as a mid PTO shaft) on the abdomen of the vehicle body together with the rear PTO shaft.

That is, as shown in FIG. 15, in the tractor body F, the PT having the transmission mechanism M and the speed change mechanism MP is provided.
O The transmission shaft system P is linked to the engine, and the vehicle body F is connected to the shaft system P.
A rear protruding PTO shaft P1 is provided, and the drive gear PG fixed to the shaft system P is connected to the drive shaft FM on the front wheel propulsion shaft device FM.
The one in which the mid PTO shaft P2 is interlocked via the relay gear PG1 above 1 has been conventionally proposed.

(Problems to be Solved by the Invention) However, in the conventional technique shown in FIG.
It has been difficult to stop the mid PTO shaft P2 independently while the rear PTO shaft P1 is being driven, as the mid PTO shaft P2 is also stopped due to the rotation and stop of the shaft P1.

Therefore, drive the mower etc. with the mid PTO axis P2, and
During the combined work in which the axis P1 drives the grass catcher and the like, the mower cannot be stopped while driving the grass catcher, which reduces the significance of the combined work using the tractor.

In view of the above problems, it is an object of the present invention to enable the mid PTO shaft to be independently stopped so that the significance of compound work by a tractor can be fully exerted.

(Means for Solving the Problem) The present invention achieves the above-described object in a tractor PTO shaft device having a PTO shaft 11 protruding from the rear of the tractor vehicle body 7 and having a PTO shaft 48 on the abdomen of the vehicle body 7. In order to do so, the following technical measures are taken.

That is, according to the present invention, the drive gear 29 is mounted on the transmission shaft system 23 disposed on the same axis as the rear PTO shaft 11 so as to idle freely, and the drive gear 29 and the abdominal PTO shaft 48 are provided. And a clutch 36 for connecting and disconnecting the drive gear 29 to and from the transmission shaft system 23, provided on the transmission shaft system 23 and in parallel with the drive gear 29 in the axial direction. It is characterized by.

(Operation) According to the present invention, a grass collector or the like is attached to the rear portion of the tractor 1 and driven by the rear PTO shaft 11, while a mower is attached to the front portion or the abdomen of the tractor 1. Abdominal PTO
In a combined operation in which the grass 48 and the mower are driven by the shaft 48, the grass cutter and the mower can be simultaneously driven and stopped.

Further, when the drive gear 29 is disengaged, the abdominal PTO shaft 48, that is, the mower can be stopped independently while the rear PTO shaft 11 is driven.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 8 shows a two-axis, four-wheel tractor 1, in which 2 is a front wheel and 3 is a rear wheel. Reference numeral 4 denotes an engine, and a clutch housing 5 and a tractor mission case 6 are connected to the rear of the engine to form a tractor vehicle body 7.

A hydraulic lifting device 8 has a pair of left and right lift arms 9, and a driver's seat 10 via a floor seat (not shown).

11 is a rear PTO shaft, and 12 is a front wheel propulsion shaft device for driving front wheels.

Referring to FIG. 1 and FIG. 3, reference numeral 13 is an auxiliary transmission mechanism, and a transmission shaft 16 having large and small diameter gears 14 and 15 and transmission gears 17 and 18 meshing with the large and small diameter gears 14 and 15 are freely rotatable. And a shift pinion shaft 19 that is fitted to the crown gear 20 of the rear wheel differential, and is slidably mounted between the transmission gears 17 and 18. By sliding L and L, it is possible to shift from the neutral position in the figure to two high and low stages. The speed change shaft 16 is linked to the engine 4 via a clutch mechanism 22 via a shuttle speed change mechanism, a main speed change mechanism, a main clutch and the like.

23 is a PTO transmission shaft system, which has a PTO speed change mechanism (not shown)
The O transmission shaft 24 and the rear PTO shaft 11 are interlocked by a transmission shaft 27 via couplings 25 and 26, and the PTO transmission shaft 24 is interlocked with the engine 4 via a main clutch or the like.

On the transmission shaft 27, a relay gear 28 having a stepped structure for driving the front wheels and a drive gear 29 for the abdominal PTO shaft device rotate via sleeve type and needle type bearings 30 and 31, respectively. The relay gear 28 is freely fitted, and is meshed with the front wheel drive gear 32 fixed to the differential pinion shaft 19.

An occlusal portion 29A is formed in the drive gear 29, and the coupling body 33 is fixed on the transmission shaft 27 at a position in front of the gear 29, and the forward movement is restricted by the thrust collar 34 and the snap ring 35. , The shifter clutch 36 is slidably fitted onto the combined body 33,
The shifter clutch 36 is slid in the direction of arrow A from the neutral position (OFF) shown in the figure to engage with the engaging portion 29A, thereby rotating the drive gear 29 together with the transmission shaft 27.

That is, the clutch 36 for connecting and disconnecting the drive gear 29 to and from the transmission shaft system 23 is provided on the transmission shaft system 23 and in parallel with the drive gear 29 in the axial direction.

The front wheel propulsion shaft device 12 is provided with a front wheel take-out shaft 38 in a transmission case 37 attached to the lower bottom of the abdomen of the tractor vehicle body 7, and the take-out shaft 38 is engaged with the relay gear 28 so that it can be freely inserted and removed. A shift gear 39 is provided, and the shift gear 39 is connected to the take-out shaft 38 by a spline, a key or the like, and can be held at each on / off position by a positioning means including a ball 40 and a spring 41.

A propulsion shaft 43 is connected to the take-out shaft 38 via a coupling 42, and the propulsion shaft 43 is interlockingly connected to a front wheel differential in a front axle case 44 shown in FIG. 8, so that the shift gear 39 is moved in the direction of arrow B. When sliding, the front wheel diff is driven together with the rear wheel diff,
Four-wheel drive is possible here.

In FIG. 1, reference numeral 45 indicates a propelling shaft cover cylinder.

A relay gear 47 for the abdominal part PTO is rotatably supported on the take-out shaft 38 via a ball bearing 46. The relay gear 47 is engaged with the drive gear 29 and the transmission case 37. It is occluded by a gear 49 on the abdominal PTO shaft 48 which is supported on the lower part of the abdomen in a laterally offset manner.

Here, the drive gear 29, the relay gear 47, the PTO shaft 48, etc. are the abdominal PTO.
The PTO shaft 48 has a spline portion 48A protruding forward of the transmission case 37 and is surrounded by a detachable PTO cover cylinder 51 when not in use.

Therefore, when the shifter clutch 36 is slid to the arrow A from the neutral state (OFF) in the first illustration to couple the transmission shaft 27 and the drive gear 29, the abdomen PTO shaft 48 is connected to the rear PTO shaft via the relay gear 47.
Driven with the shaft 11, the rear part in the neutral state shown
Only the PTO axis 11 is driven.

It is also possible to connect and disconnect only the abdominal PTO shaft 48 by providing a clutch mechanism in the middle of the rear PTO shaft 11.

Referring to FIGS. 3 and 4, the positional relationship among the transmission shaft 16, the differential pinion shaft 19, the transmission shaft 27, the take-out shaft 38, and the abdominal PTO shaft 48, and the operation for opening / closing the shifter clutches 21 and 36 and the shift gear 39. The relationship of the lever system is shown.

In FIGS. 3 and 4, reference numeral 52 denotes an auxiliary shift operation lever,
A support shaft 54 is inserted and supported by a boss portion 53 formed on the vertical side surface 7A of the tractor vehicle body 7 with its axis centering in the lateral direction, and an arm 55 attached to the inner end of the support shaft 54 is engaged with a shift fork 56. At the same time, the lever base is attached to the support shaft 54 through the tubular body 57, and the grip is positioned on the side of the driver's seat 10. The shift fork 56 is supported by the fork shaft 58, is engaged with the circumferential groove of the shifter clutch 21, and moves the operating lever 52 back and forth about the support shaft 54, whereby
It can be freely opened and closed through H and L in FIG. 1 via 56.

59 is an operating lever for the abdominal PTO axis device,
A support shaft 61 is rotatably supported on the boss portion 60 formed in A so as to be rotatable around the shaft center with the shaft center as the lateral direction. In the embodiment shown in FIG. 3, it is fixed to the shaft end of the support shaft 61. The L-shaped arm 62 is engaged with the circumferential groove of the shifter clutch 36, and in the embodiment shown in FIG. 4, the arm 63 made of a flat plate, a bar or the like is fixed to the shaft end of the support shaft 61.
Is engaged with the shift fork 64, the fork 64 is engaged with the circumferential groove of the shifter clutch 36, and the fork 64 is supported by the fork shaft 65.

A boss cylinder 66 fixed to the base of the operation lever 59 is attached to the support shaft 61 with a key, a pin or the like, and the O-ring 67 is retained by the boss 66, and the operation lever 59 is extended near the driver's seat 10. It becomes.

Therefore, by moving the operating lever 59 back and forth around the support shaft 61, the shifter clutch 36 is slid in the arrow A direction and the counter arrow A direction.

Reference numeral 68 denotes an operation lever for the propulsion shaft device, and a boss cylinder 69 at the base thereof is pivotally supported with the support shaft 61 as a common shaft, extends upward from the boss cylinder 69, and extends near the driver's seat 10. And further extend the arm 70 below the boss cylinder 69,
The arm 72 of the support shaft 71 inserted into the transmission case 37 is engaged with the arm 73 attached to the support shaft 71 in the circumferential groove of the shift gear 39.

Therefore, when the operation lever 68 is operated back and forth around the support shaft 61, the arm 73 swings around the support shaft 61 as a relay support point to slide the shift gear 39 in the arrow B direction and the counter arrow B direction.

2 and 5 to 7 show another embodiment of the present invention, in which the drive gear 31, the shifter clutch 36 and the like are modified, and the other parts are common to the above-mentioned embodiment. Common parts are indicated by common symbols.

In FIG. 2, the thrust collar 34 is engaged with the groove 74 formed in the transmission shaft 27 to restrict the forward movement of the connector 33.
The collar 34 is formed to have a large diameter so that the shifter clutch 36 can also be prevented from coming off.

5 to 7 show the shifter clutch 36 mounted on the transmission shaft 27 by means of splines, keys, etc., and the connector 33 is omitted. FIG. 5 shows the clutch portion 36A on the inner peripheral surface, and FIG. The clutch portion 36A is shown on the outer peripheral surface, and FIG. 7 shows the clutch portion 36A on the inner and outer peripheral surfaces.

9 to 14 show the respective embodiments of the positioning means 74 of the operating lever 59, and in particular, they are indispensable for the positioning of the shifter clutch 36 shown in FIG. That is, when the operating lever 59 is returned to the neutral state, the clutch 36 contacts the gear 18 without this positioning, which is indispensable for preventing this.

FIG. 9 shows that a bracket 76 is attached to the vertical side surface 7A with a bolt 75 and the bracket 76 is hit at the neutral position of the operating lever 59.
In addition to forming A, the ball 77 is used to position the neutral position (OFF) and the entrance position (ON).

FIG. 10 shows the embodiment of FIG. 9 with a contact 76B at the entry position added, and FIG. 11 shows that the leaf spring material 78 is fixed to the vertical side surface 7A with bolts for positioning at two positions. While forming the uneven portion 78A on the leaf spring material 78, on the lever base portion,
The leaf spring material 79 having the uneven portion 79A is fixed.

12 and 13, the leaf spring material 78 is extended to the support shaft 61 to hold the O-ring 67, and the lever base is provided with a ball 80 that engages with the uneven portion 78A of the leaf spring material 78. It shows the one that is fitted so that it can roll freely.

FIG. 14 shows a bracket 81 for shuttle shifts and other shift levers that extends to the support shaft 61 and serves as a retainer for the O-ring 67.

In addition, in FIG. 9, FIG. 10, and FIG.
C position is the neutral (disengaged) position, and when it is in the D position, the arm 62 or shift fork 64 indicates the shifter clutch 36 by the arrow B.
Slide in the direction. Further, in the figure, 82 indicates a floor sheet.

(Effects of the Invention) The present invention is as described above, and the present invention relates to the rear PTO.
Since the drive shaft for the abdomen PTO shaft is detachably connected to the transmission shaft system of the abdomen, and the drive gear and the abdomen PTO shaft are interlockable, the rear PTO shaft and the abdomen PTO shaft are connected. The abdominal PTO shaft can be stopped independently while being able to drive and stop at the same time, which makes the combined work by the tractor more meaningful.

Further, since a clutch that allows the drive gear to be connected / disconnected is provided on the transmission shaft system in parallel with the drive gear in the axial direction, the levers for connecting / disconnecting the clutch should be provided separately from the ground. As a result, the ground clearance becomes large, and it is expected that the operation of the lever will be smoothed by preventing the levers from being entangled with mud and weeds.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a sectional view of a mission portion on an elevational side, FIG. 2 is an enlarged sectional view of an essential part, and FIG. The figure is an enlarged sectional view of the operating lever system, Figs. 5 to 7 are enlarged sectional views of the abdominal PTO system, Fig. 8 is an overall side view of the tractor, and Figs. 9 to 14 are operating lever system. FIG. 9 shows each embodiment.
10 and 14 are side views, FIG. 11 and FIG. 12 are front and rear views, and FIG. 13 is a partially enlarged sectional view of FIG.
FIG. 15 is a sectional view of a conventional example. 7 …… tractor body, 11 …… rear PTO shaft, 23 …… PTO transmission shaft system, 29 …… drive gear, 36 …… shifter clutch, 47 ……
Relay gear, 48 …… Abdominal PTO shaft, 50 …… Abdominal PTO shaft device.

Claims (1)

[Claims] 1. A PTO shaft (11) at the rear of the tractor body (7).
And the PTO shaft (4
In a PTO shaft device for a tractor having 8), a drive gear (29) is idlely mounted on a transmission shaft system (23) arranged on the same axis as the rear PTO shaft (11). A relay gear (47) for interlocking the drive gear (29) and the abdominal PTO shaft (48), and a clutch (36) for connecting and disconnecting the drive gear (29) to the transmission shaft system (23). A PTO shaft device for a tractor, which is provided on the transmission shaft system (23) and in parallel with the drive gear (29) in the axial direction.