JP2546720Y2 - Clutch device for PTO shaft of tractor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device for a tractor PTO shaft.

[0002]

2. Description of the Related Art Conventionally, a working machine such as a tilling rotary has been mounted at the rear of a tractor so as to be able to move up and down. Such a working machine has been raised and lowered through a hydraulic cylinder and a lift arm provided on a tractor.

An output shaft is protrudingly provided at the rear of the tractor. Power from an engine is connected to the output shaft via a power transmission shaft, and a working machine is interlocked to the output shaft. I was In addition, the power transmission shaft and the output shaft are connected to the working machine by the clutch mechanism via the clutch mechanism.
The suspension was going on.

[0004]

However, the above-mentioned tractor has the following problems.

[0005] That is, when working with a work machine attached to the back of a tractor, when the work machine is lifted and inspection is performed, the work machine is operated without being stopped due to the complicated operation of stopping by the operation lever. May be checked in this case. In this case,
It was very dangerous when the implement was working.

An object of the present invention is to provide a clutch device for a PTO shaft of a tractor which can solve the above-mentioned problems.

[0007]

According to the present invention, a working machine is mounted on a rear portion of a tractor via a hydraulic cylinder and a lift arm so as to be able to move up and down, and a working machine is provided by a PTO shaft for power take-out provided at the rear portion of the tractor. In a tractor configured to be able to drive, a clutch operating cylinder is communicatively connected to the hydraulic cylinder via a connecting oil passage, and a PTO shaft clutch device is provided at a tip end of a rod of the cylinder. A clutch device for a tractor PTO shaft, characterized in that a power transmission shaft from an engine and a PTO shaft can be connected and disconnected via the device.

[0008]

According to the present invention, a hydraulic cylinder for lifting and lowering a working machine via a lift arm and a clutch operating cylinder for connecting and disconnecting a clutch device for a PTO shaft are connected and connected via a connecting oil passage. Therefore, the expansion and contraction operation of the clutch cylinder for connecting and disconnecting the clutch device for the PTO shaft can be reliably linked to the expansion and contraction operation of the hydraulic cylinder for raising and lowering the work implement via the connecting oil passage.

Therefore, the connection operation between the power transmission shaft from the engine and the PTO shaft can be reliably linked to the lowering operation of the working machine by the hydraulic cylinder via the clutch device for the PTO shaft by the clutch operating cylinder. ,
Disengagement between the power transmission shaft from the engine and the PTO shaft via the PTO shaft clutch device by the clutch operation cylinder can be reliably linked to the lifting operation of the working machine by the hydraulic cylinder.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a tractor according to the present invention; FIG. 1 is a side view of the tractor according to the present invention; FIG. A power transmission shaft 25 is interlocked to the engine E via a clutch 4, and the power transmission shaft 25 extends to a transmission case 5 disposed on the rear side. 3
Indicates a hood containing an engine.

A rear axle 6 interlocking with the power transmission shaft 5 protrudes from left and right sides of the transmission case 5, and a rear wheel 7 is connected to the axle 6 so as to be drivable. On the other hand,
A front axle case 8 is arranged at the lower front side of the
A front axle 9 protruding from the left and right sides of the case 8 has front wheels 10
Are linked. Further, a front shaft 11 that is interlockingly connected to the front axle case 8 is provided at the front of the transmission case 5 so as to be able to drive the front wheels 10. In addition, 12 is a seat of the driving unit, 13 is a steering wheel for steering the front wheel 10, 14 is various operation levers provided on the side of the seat 12,
Reference numeral 15 denotes a fender of the rear wheel 7.

As shown in FIG. 2, a work machine 16 such as a cultivator is mounted on the rear part of the tractor 1 so as to be able to move up and down. The work machine 16 is attached to the tip of the arm 17, and the work machine 16 is moved up and down by the arm 17. Reference numeral 18 denotes an arm link connected to the lift arm 17 and the lower link 16a of the work machine 16, and 19 denotes a three-point link lifting mechanism of the work machine 16.

A hydraulic mechanism 20 for raising and lowering the lift arm 17 is built in the transmission case 5, and the hydraulic mechanism 20 is provided in the transmission case 5 as shown in FIG. The hydraulic cylinder 22 connected to the lift arm 17 is connected to the hydraulic cylinder 22 by operating a pump 23 provided on the hydraulic flow path 21 to supply the hydraulic oil in the case 5 to the hydraulic cylinder 22. The lifting operation is performed. 21a denotes a return flow path from the hydraulic cylinder 22, 21b denotes a check valve, 21c denotes a descending main valve, and 21d denotes an ascending main valve.

At the rear end of the transmission case 5,
A PTO shaft 24 for taking out power from the engine E is protruded, and the working machine 16 is driven by the working machine 16 linked to the PTO shaft 24.

In the present invention, in the tractor 1 described above,
When the work machine 16 is moved up and down by the operation of the lift arm 17, connection and disconnection between the power transmission shaft 25 from the engine E and the PTO shaft 24 are switched, and the configuration will be described in detail below. That is, the hydraulic cylinder 22 is of the backward type,
A clutch operating cylinder 26 is communicatively connected to the other side of the cylinder 22 via a connecting oil passage 21e so that the clutch operating cylinder 26 can be operated by the hydraulic pressure from the cylinder 22. Also, the rod of the cylinder 26 for clutch operation is
26a is provided with a P provided between the power transmission shaft 25 and the PTO shaft 24.
The power is transmitted to the PTO shaft 24 by interlockingly connecting the clutch device 27 for the TO shaft.

In this embodiment, the clutch device 27 for the PTO shaft is used.
A multi-plate type clutch portion 28 interposed between the power transmission shaft 25 and the PTO shaft 24, a clutch gear 29 connected to the clutch portion 28, and a clutch fork 30 for operating the clutch gear 29. The clutch fork 30 is mounted on the distal end of the rod 26a of the clutch operating cylinder 26 via an adjust a to operate the fork 30.

With this configuration, when the lift arm 17 is operated via the lifting hydraulic mechanism 20 and the work machine 16 is lowered, the hydraulic cylinder 22 which operates the arm 17 causes the clutch operating cylinder 26 to operate. Activate the clutch gear with the clutch fork 30 of the clutch device 27 for the PTO shaft.
The PTO shaft 24 is automatically driven by receiving power from the power transmission shaft 25 by connecting the clutch 29 to the clutch unit 28. In addition, the adjustment a allows the clutch fork 30 to be operated smoothly, so that the clutch gear 29 and the clutch portion 28 can be connected.

Therefore, in the present invention, when the work machine 16 is lowered, the PTO shaft clutch device 27 is engaged, and the work machine 16
Is activated, while the work implement 16 is raised, the PTO
The clutch device 27 for the shaft is disengaged, and the work machine 16 can be stopped.

The transmission case 5 is communicated with a hydraulic passage 21 through a hydraulic strainer 31. The hydraulic strainer 31 has a double-walled cylindrical structure as shown in FIG. The inner and outer strainer bodies 32 and 33 are attached so that the hydraulic oil flows through the filters 32a and 33a provided on the outer peripheral surfaces of the inner and outer strainer bodies 32 and 33 and flows out to the hydraulic passage 21.

Further, at the tip of the outer strainer body 33, an inflow port 34 is provided, and inside the inflow port 34,
A valve body 35 and a spring 36 that closes the inflow port 34 with the valve body 35 are attached. In this embodiment, the inner and outer strainer body
A valve body 35 and a spring 36 are mounted in the space S between the distal ends of the 32 and 33. When the outer strainer main body 33 is clogged, the valve body 35 operates to open the inflow port 34. , And supply the hydraulic oil.

Further, as another embodiment, a step portion 37 is provided in the operating portion of the tractor 1 and a tool box 38 is housed in the step portion 37. Hereinafter, referring to FIGS. The configuration will be described in detail. That is, a plurality of substantially L-shaped tool box support stays 37a project from the inner side toward the outer side at the lower front and rear portions of the step portion 37, and the tool box 38 is attached to the stay 37a.
Is placed.

Further, front and rear auxiliary plates 39 are vertically provided at the lower front and rear portions of the step portion 37, and a bar for fixing a tool box is provided on each auxiliary plate 39.
40 is rotatably supported in the horizontal direction. Reference numeral 40a denotes a shaft support portion of the tool box fixing bar 40, and reference numeral 40b denotes a fixing projection provided on the auxiliary plate 39, which fixes the tool box fixing bar 40 in a horizontal state.

Then, the tool box is supported on the tool box support stay 37a.
The tool box 38 is mounted on the front and rear auxiliary plate 39, and the tool box fixing bar 40 is rotated in a horizontal state so that the tool box 38 is fixed by the bar 40.

FIG. 8 shows an engine E disposed in the hood 3 and a car wash pump 41 is connected to the engine E in an interlocking manner. In this embodiment, the engine E
A power take-out power case 41 having a clutch mechanism
Are protruded toward the side, and a car wash pump 41 is connected to a tip end of the case 41 via an attachment stay 42.

Further, a lever 43 of a clutch mechanism is provided in the middle of the power case 41, and the car wash pump 41 is operated by the lever 43.

FIGS. 9 to 15 show a tractor front wheel drive transmission. In the drawings, reference numeral 50 denotes a tractor front wheel drive system. The tractor front wheel drive system 50 includes a front wheel drive shaft 51 and a front wheel differential device 52, and can steer the front wheels 10 around the kingpin via the front wheel differential device 52. Also, in the front wheel drive system 50, the front wheel drive shaft
A speed increase switching mechanism B is provided between the front wheel differential device 51 and the front wheel differential device 52.

Numeral 54 denotes a front axle case which incorporates a front wheel differential device 52 and is supported so as to be swingable right and left. The front axle case 54 has a base portion of a cylindrical casing 55 connected to a rear portion thereof. The front axle case 54 is supported by a bearing 57 fixed to a machine frame 56.

The cylindrical casing 55 has a pinion shaft 59 having a bevel gear 58 therein and a speed-increasing switching mechanism input shaft 60 interlockingly connected to the front wheel drive shaft 51.

Reference numeral 61 denotes an intermediate rotary cylinder mounted concentrically and relatively rotatably over substantially the entire length of the pinion shaft 59. The intermediate rotary cylinder 61 has a spline slidable in the axial direction at the rear end side. A sliding cam body 62 that rotates integrally with the intermediate rotary cylinder 61 is attached, and the sliding cam body 62 is connected to a rear end of the speed increasing switching mechanism input shaft 60 via a dog clutch 63 via a spline. 64 is detachably engaged.

The sliding cam body 62 is moved in the axial direction by a fork 66 pivotally supported by a yoke support shaft 65. The swinging fork 66 includes a steering mechanism D and an operating mechanism. C, the dog clutch 63 can be disengaged and disengaged, and the multi-plate clutch 67 can be operated.

That is, the multi-plate clutch 67 compresses the spring 68 by the axial movement of the sliding cam body 62 caused by the swing of the swinging fork 66, and causes the intermediate rotary cylinder 61 to move the intermediate rotary cylinder 61 to the cylindrical casing 55.
And its rotation can be stopped. Also, 70
Is a speed increasing differential mechanism provided at the rear end of the pinion shaft 59,
The differential mechanism 70 has a rotating housing 71 mounted concentrically around the rear end of the pinion shaft 59, and a front and rear surface of a bevel gear 72 having an axis on the inner surface of the rotating housing 71 in a direction orthogonal to the axis of the pinion shaft 59. And the respective pinion shaft 59
And a bevel gear 74 fixed to the rear end and a bevel gear 74 integrally formed at the rear end of the intermediate rotary cylinder 61.

When the steering mechanism D is not steered to the extent that the swinging fork 66 is actuated, the multi-plate clutch 67 is not actuated, and therefore, the intermediate rotary cylinder 61 is not fixed to the cylindrical casing 55. . On the other hand, the speed increase switching mechanism input shaft 60 is integrally connected to the intermediate rotary cylinder 61 by the dog clutch 63.

For this reason, the rotation of the front wheel drive shaft 51 is controlled by rotating the speed increasing switching mechanism input shaft 60 from the rotary housing 71 and the intermediate rotary cylinder 61.
And transmitted to the front wheel 10 via the bevel gear 62, the bevel gear 63, the pinion shaft 59, the bevel gear 74, the intermediate rotary cylinder 61, and the front wheel differential device 52.

On the other hand, when the steering mechanism D is steered to the extent that the swinging fork 66 is operated, the swinging fork 66 presses the multi-plate clutch 67 via the sliding cam body 62, whereby the intermediate rotating cylinder When the dog clutch 63 is disengaged, the connection between the speed increasing switching mechanism input shaft 60 and the intermediate rotary cylinder 61 is released.

For this reason, the rotation of the front wheel drive shaft 51 is transmitted from the speed increasing switching mechanism input shaft 60 to the rotary housing 71.
Only the power transmission path of the bevel gear 72 → the bevel gear 73 → the pinion shaft 59 → the front axle case 54 is active, and this and the relative rotation with the rotating housing 71 form an operating gear mechanism, and the pinion shaft 59 and the bevel gear 58 Is rotated at twice the speed of the front wheel drive shaft 51, and thereafter transmitted from the front wheel differential device 52 to the front wheels 10. Therefore, the tractor 1 can turn at a small turning radius without causing a slip.

In the above-described speed increasing operation, the speed increasing switching mechanism B according to the present embodiment is provided with the speed increasing differential mechanism 70 including the multi-plate clutch 67 and the operating gear device. Since the speed can be increased steplessly and the multi-plate clutch 67 absorbs the load, the field is not damaged.

FIGS. 11 and 12 show a steering gear box. In the figures, reference numeral 85 denotes a steering gear box connected to a steering handle, and 87 denotes a drive gear provided in the steering gear box 85. And the front end bevel gear portion 86 meshes with a sector-shaped steering operation gear 88 which is pivotally supported in the steering gear box 85. Reference numeral 89 denotes a pitman arm shaft to which a pitman arm 90 is fixed. Reference numeral 91 denotes an operation projection, and reference numeral 92 denotes a front-rear sliding body having engagement projections 93, 93 on the upper surface. A sliding shaft 94 connects the connecting rod 95.

Reference numeral 96 denotes a slide hole provided in the front-rear sliding body 92, and reference numeral 97 denotes elastic means provided on the lower side. Reference numeral 98 denotes a push-down means provided on the upper part of the front-rear sliding body 92, which is configured so that the interlock between the steering operation gear 88 and the front-rear sliding body 92 can be disassembled. 99 is a support shaft for supporting the lowering means 98, 100 is a tension lever, and 101 is an operation lever provided outside the yoke support shaft 65, and is connected to the connecting rod 95. 101A is a front wheel speed-up operation lever.

FIGS. 13 to 15 are cross-sectional views of the main part of the yoke support shaft. Connected. Then, the yoke support shaft 65 and the operating lever 10
The key 2 is connected to the key 105 by a notch groove 106, and the operating lever 102 and the yoke support shaft 65 can rotate freely within a certain range.

The operating lever 101 mounted on the other side of the yoke support shaft 65 and the yoke support shaft 65 are provided with a key 107 and a notch groove.
The operation lever 101 and the yoke support shaft 65 are rotatable within a certain range.

Accordingly, in the above embodiment, when the operation lever 101A for forward rotation speed increase is turned off and the four-drive off lever 104 is turned on, the operating lever 102 and the yoke support shaft 65 are rotated. The swinging fork 66 operates the swinging cam body 62 and simultaneously releases the dog clutch 63 and
Change the wheel drive state to two-wheel drive.

[Brief description of the drawings]

FIG. 1 is a side view of the tractor according to the present invention.

FIG. 2 is an explanatory view showing a state in which a working machine is attached to a tractor.

FIG. 3 is a hydraulic circuit diagram showing a lifting hydraulic mechanism of the working machine.

FIG. 4 is an explanatory diagram of a hydraulic strainer.

FIG. 5 is an explanatory diagram showing an operation state of a valve body of the hydraulic strainer.

FIG. 6 is an explanatory diagram showing a configuration of a step unit of the driving unit.

FIG. 7 is an explanatory sectional view of the step portion.

FIG. 8 is an explanatory view of a car wash pump provided in the engine.

FIG. 9 is a sectional side view of the front wheel speed increasing mechanism.

FIG. 10 is a plan view of the same.

FIG. 11 is a plan view of the steering gear box.

FIG. 12 is a sectional side view of the box.

FIG. 13 is a cross-sectional rear view of the yoke support shaft.

FIG. 14 is a side view showing an attached state of the operation lever.

FIG. 15 is a side view showing an attached state of the operation lever.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor 16 Work machine 17 Lift arm 22 Hydraulic cylinder 24 PTO shaft 26 Cylinder for operating clutch 27 Clutch device for PTO shaft

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-167337 (JP, A) JP-A-1-56237 (JP, A) Fully open 1954-14471 (JP, U) Really open 1980 3026 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A hydraulic cylinder (22) is provided at the rear of the tractor (1).
And the work machine (16) can be vertically moved via the lift arm (17), and the work machine (16) can be driven by the power take-off PTO shaft (24) provided at the rear of the tractor (1). In the tractor configured, the hydraulic cylinder (22)
And the cylinder (26) for operating the clutch via the connecting oil passage (21e).
At the end of the rod of the cylinder (26),
A clutch device (27) for the PTO shaft is provided, and the clutch device (2
7) and the PTO shaft (2)
4) A clutch device for a PTO shaft of a tractor, wherein the clutch device is configured to be connectable / disconnectable to 4).