JPH0568409A - Multiple-purpose working machine - Google Patents

Abstract

PURPOSE:To vertically move a hitch in a state to stop the power transmission to a working apparatus of a PTO system by branching a transmission mechanism from the upstream side of a clutch to couple a PTO-system transmission shaft to a power take-off shaft in interlocked state and driving a compressed oil supplying pump with the transmission mechanism. CONSTITUTION:A PTO-system transmission shaft 11 driven by the 1st clutch of a PTO transmission system is connected to a power take-off shaft 17 supported on a hitch via the 2nd clutch 26. A pump 20 for supplying compressed oil to a hydraulic actuator to vertically move the hitch is driven by a transmission mechanism 25 branched from the upstream side of the clutch 26 and downstream side of the 1st clutch.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a multipurpose working machine.

[0002]

2. Description of the Related Art Conventionally, as a multipurpose working machine, a walking type working machine has been used for the purpose of performing management work such as mowing and tilling, but in recent years, with the increase in size of working equipment, Since it has become difficult to manually hold the handle, a riding-type working machine, which is a modification of the walk-type working machine having the conventional structure, has come to be provided.

[0003]

Therefore, the engine, mission case, crawler traveling device, etc. of the conventional walk-type working machine are assembled in the same manner as in the conventional case, and the control seat is positioned above the mission case. , The control tower was placed in front of the control seat, and the working device was attached further forward than the control tower. By the way, a hydraulic actuator for vertically swinging the hitch with respect to the working device is interlockingly connected to the hitch, and the driving power of this hydraulic actuator is obtained from a transmission system for driving the working device. The structure is such that only one clutch is provided in the transmission system for driving the working device. For this reason, when the work device is attached to or detached from the hitch, if the PTO system is kept driven so that the hydraulic actuator can be driven, the power to the work device can be transmitted, so that the work device is suddenly transmitted to the work device. In addition to the danger, if the PTO system is stopped to avoid this danger, the hydraulic actuator cannot be driven.
There is a drawback that it is difficult to attach and detach the work device.

The present invention has been made in view of the above circumstances, and when the work device is attached to or detached from the hitch, the PT
An object of the present invention is to provide a multi-purpose work machine capable of swinging a hitch up and down for easy attachment / detachment in a state where power transmission to an O-type work device is stopped.

[0005]

In order to achieve the above-mentioned object, a multi-purpose working machine according to the present invention has a rear portion of an airframe in which an engine, a mission case, and a control seat are supported by a pair of left and right crawler traveling devices. And a control tower is provided on the fuselage in a state of being positioned in front of the control seat, and a hitch to which a working device is detachably attached is provided at a position in front of the control tower. It is configured to be able to swing up and down with, and is input via the first clutch of the PTO transmission system,
PT extended forward from the mission case
The O-system transmission shaft and the power transmission shaft supported by the hitch,
A pump for supplying pressure oil to the hydraulic actuator is driven by a transmission mechanism in which the transmission upper hand of the second clutch and the transmission lower hand of the first clutch are branched from each other. A characteristic configuration is that it is configured to do so. The actions and effects of this characteristic configuration are as follows.

[0006]

In other words, the hitch to which the work device is detachably attached is configured to be vertically swingable by the hydraulic actuator, and the hitch is input through the first clutch of the PTO transmission system to extend forward from the mission case. Issued P
The TO-system transmission shaft and the power transmission shaft supported by the hitch are interlockingly connected via a second clutch, and a pump for supplying pressure oil to the hydraulic actuator is well-transmitted by the first clutch. Transmission of the clutch Since the lower hand is driven by a transmission mechanism that branches off, when the work device is attached to or detached from the hitch, the first clutch is in the transmission connection state and the second clutch is transmitted. In the cut state, the power transmission shaft supported by the hitch is stopped, and the working device can be attached / detached while vertically swinging the hitch. The drive of the work device connected to the hitch is performed by putting the first and second clutches into a transmission connection state.

[0007]

Therefore, by appropriately opening and closing the second clutch, the work device can be attached to and detached from the hitch without unduly operating the work device, and safety can be improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an example of a multipurpose working machine according to the present invention. In this multipurpose working machine, an engine 3 is arranged at the rearmost part of a machine body 2 having a frame structure supported by a pair of left and right crawler traveling devices 1, 1, and the power from the engine 3 is supplied to a main clutch and a hydrostatic type. The transmission case 5 input via the speed change device 4 is connected to the main frame 2A in front of the engine 3, and the seat installation frame 2B is erected above the transmission case 5 from the main frame 2A. The control seat 6 is attached to 2B, and a control tower 8 equipped with a steering lever 7, a clutch lever, etc. is erected in front of the control seat 6, and further in front of the control tower 8, mowing The work device 9 such as a device can be swung up and down and can be freely attached and detached.
It is configured by attaching via 0.

As shown in FIGS. 1 and 4, the drive shaft pulley 3A and the PT connected to the output shaft of the engine 3 are connected to each other.
A driven wire pulley 11 connected to the end of the O-system transmission shaft 11
A belt transmission mechanism 12 is provided so as to extend over A. The PTO system transmission shaft 11 and the driven wobble pulley 11A are interlockingly connected via a friction multi-plate clutch 23 as a first clutch. Furthermore, PTO system transmission shaft 11
Extends forward from the mission case 5 in a state of penetrating the lower part of the mission case 5, and the drive sprockets 1A of the left and right crawler traveling devices 1, 1 from the lower lateral sides of the mission case 5. The traveling output shafts 13, 13 that are interlocked with 1A are projected to the left and right. The PTO transmission shaft 11 is interlockingly connected to a pair of front and rear universal joints 14 and 15 and a power take-off shaft 17 pivotally attached to the hitch 10 via a transmission shaft 16 connecting the universal joints 14 and 15. .. In this hitch 10, as shown in FIGS. 1 and 2, the power of the hitch main body 10A machined into a box-like shape is faced with a meshing clutch portion 17A meshingly connected to the input shaft of the working device 9. The take-out shaft 17 is pivotally attached.

Further, as shown in FIG. 1, the hitch 10 has a pair of left and right arm members 10B, 10B extending rearward from the hitch main body 10A and swings up and down around a horizontal axis P on the main frame 2A of the machine body. It is freely pivoted. A cylinder rod 19a of a single-acting hydraulic cylinder 19 as a hydraulic actuator that swings the hitch 10 up and down is pivotally mounted on a pin 18 laid across the free ends of the arm members 10B, 10B. The cylinder tube 19b of 19 is pivotally mounted while being arranged in the exterior box case 8A of the control tower 8. As shown in FIGS. 1 to 3, a hydraulic pump unit 20 for expanding and contracting the hydraulic cylinder 19 is provided between the left and right crawler traveling devices 1, 1 and between the mission case 5 and the control tower 8. In the space below the PTO system transmission shaft 11 in the fuselage lower abdomen.

The hydraulic pump unit 20 is shown in FIG.
As shown in FIG. 3, a hydraulic pump serving as a pressure oil supply source to the hydraulic cylinder 19, an oil tank, and a switching valve for switching the pressure oil supply / discharge passage are integrally assembled, and The drive of the pump unit 20 is
The driven pulley 21 provided on the input shaft of the hydraulic pump;
A belt type transmission mechanism 25 in which a belt 24 is stretched across a drive pulley 22 connected to the TO-system transmission shaft 11 is used. The transmission of power to the power take-off shaft 17
This is performed by a dog clutch 26 serving as a second clutch that is shifted. That is, as shown in FIG.
A shaft 15 of the universal joint 15 is provided so that a shift member 28 locked to a lower end portion of a clutch operating lever 27 beside the control seat 6 can be slid in a perspective direction with respect to the drive pulley 22.
The spline fitting to A is performed, and the shift member 28
The gear-shaped fitting portion 28A formed at the end portion of the drive pulley 22 facing the drive pulley 22 is fitted into and removed from the fitting concave portion 22A formed on the surface side of the drive pulley 22 facing the shift member 28 by the sliding operation of the shift member 28. The dog clutch 26 is configured as possible.

The friction-type multi-plate clutch 23 is used in the control tower 8
It is linked to a clutch lever 29 provided on the vehicle, and is operated by turning the clutch lever 29. Here, by operating the friction-type multi-plate clutch 23, the power transmission to the PTO system as a whole can be cut off, and in the state where the friction-type multi-plate clutch 23 is turned on and off, the dog clutch 26 is turned on and off. If so, a state in which the hitch 10 can be vertically swung while the power transmission to the work device 9 is stopped appears.
If the dog clutch 26 is operated in the engaged state, the power is transmitted to the work device 9 and the hitch 10 can be vertically swung.

In addition to the drive pulley 22, another drive pulley may be provided in parallel with the PTO system transmission shaft 11 so that power can be taken out.

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

[Brief description of drawings]

FIG. 1 is an overall side view showing a multipurpose working machine.

FIG. 2 is a plan view showing a multipurpose working machine.

FIG. 3 is a side view showing a multipurpose working machine equipped with a working device.

FIG. 4 is a schematic diagram showing a transmission system for a work device.

FIG. 5 is a side view showing a hydraulic pump unit and a power transmission shaft.

[Explanation of symbols]

 1 Crawler Traveling Device 2 Aircraft 3 Engine 5 Mission Case 6 Control Seat 8 Control Tower 9 Work Device 10 Hitch 11 PTO System Transmission Shaft 17 Power Extraction Shaft 19 Hydraulic Actuator 20 Hydraulic Oil Supply Pump 23 First Clutch 25 Transmission Mechanism 26 2nd clutch

Claims (1)

[Claims] 1. An engine (3), a mission case (5), and a control seat (6) are arranged at the rear of an airframe (2) supported by a pair of left and right crawler traveling devices (1), and The control tower (8) is provided on the fuselage (2) in a state of being located in front of the control seat (6), and the hitch (10) to which the working device (9) is detachably attached is provided to the control tower (8). In preparation for a more forward position, this hitch (1
0) is configured to be vertically swingable by a hydraulic actuator (19), and is input through the first clutch (23) of the PTO transmission system to extend forward from the mission case (5). PTO system transmission shaft (1
1) and the power takeoff shaft (1) supported by the hitch (10).
7) and are interlockingly connected via the second clutch (26),
In addition, a transmission mechanism in which the hydraulic oil supply pump (20) for the hydraulic actuator (19) is branched by the transmission upper hand of the second clutch (26) and the transmission lower hand of the first clutch (23). A multipurpose working machine configured to be driven by (25).