JP2000324904A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a working machine which can allow a working device to swing on a swinging support shaft and can thereby hold the working device in a constant posture to well ensure a good working performance, even when the travel vehicle body is laterally swung due to the uneven surface of a field, by detachably attaching the working device to a hitch member attached by a specific method. SOLUTION: In this working machine, a working device is connected to the rear portion of a travel vehicle body B through a lifting mechanism D, and a vehicle body frame 2 is disposed between a pair of right and left crawler type travel members 1 in the travel vehicle body B. An operation seat 3, a motor portion 4 and a transmission 5 are arranged on the vehicle body frame 2, and the travel members 1 are interlocked and connected to the motor portion 4 through the transmission 5. Therein, a hitch member is axially rotatably attached to the lifting mechanism D through a swinging support shaft whose axis is directed in the longitudinal direction, and the working device is detachably attached to the hitch member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a working machine.

[0002]

2. Description of the Related Art Conventionally, as one form of a working machine, a working device is connected to a rear side of a traveling vehicle body via an elevating mechanism, and the traveling vehicle body has a vehicle body frame interposed between a pair of left and right crawler traveling parts. There is a vehicle in which a driving unit, a motor unit, and a transmission unit are provided on the vehicle body frame, and the driving unit is linked to the driving unit via a transmission unit.

[0003]

However, in the working machine described above, since the traveling part is of the crawler type, the contact pressure on the field scene can be significantly reduced as compared with the wheel type. The traveling vehicle body swings left and right under the influence of the unevenness formed in the field scene, the posture of the working device cannot be kept constant, and the working performance by the working device cannot be secured well. There is a problem that.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention relates to a work apparatus in which a working device is connected to the rear of a traveling vehicle body via an elevating mechanism, and the traveling vehicle body has a body frame interposed between a pair of left and right crawler traveling parts. And, while providing a driving unit, a prime mover unit and a mission unit on the body frame, the working unit in which the traveling unit is linked to the prime mover unit via a transmission unit,
A hitch body is attached to the lifting mechanism rotatably around the swing support shaft via a swing support shaft whose axis is oriented in the front-rear direction, and a working device is detachably attached to the hitch body. To provide a working machine that performs

Further, according to the present invention, in the working vehicle described above, a PTO shaft is disposed on a traveling vehicle body with its axis oriented in the left-right direction, and an elevating mechanism is vertically rotatable around the axis of the PTO shaft. And, the hitch body attaches the hitch main body to a swing support shaft rotatably inserted through a lifting boss portion through a swing boss portion, and an upper bearing portion is provided at an upper end of the hitch main body above the swing support shaft. On the other hand, the lower bearing is provided at the lower end portion below the swing support shaft,
It is also characterized in that upper and lower connecting pins provided on the working device are detachably engaged with these upper and lower bearing portions to enable connection.

[0006]

The embodiments of the present invention will be described below.

That is, the working machine according to the present invention has, as a basic structure, a working device connected to the rear of a traveling vehicle body via a lifting mechanism, and the traveling vehicle body has a body frame between a pair of left and right crawler traveling parts. An operation unit, a motor unit, and a transmission unit are provided on the vehicle body frame, and the running unit is interlocked to the motor unit via a transmission unit.

As a characteristic structure, a hitch body is rotatably mounted around the swing support shaft via a swing support shaft whose axis is oriented in the front-rear direction to the lifting mechanism, and a working device is mounted on the hitch body. It is detachably attached.

In this way, even when the traveling vehicle body swings right and left under the influence of the unevenness formed in the field scene, the working device swings around the swing support shaft and maintains a constant posture. In addition, good working performance can be ensured.

Further, a PTO shaft is disposed on the traveling vehicle body with its axis oriented in the left-right direction, and an elevating mechanism is vertically rotatable around the axis of the PTO shaft.

In this way, the members for supporting the PTO shaft and the rotation fulcrum of the lifting mechanism can be shared, a compact structure can be achieved, and the manufacturing cost can be reduced.

The hitch body has a hitch main body attached to a swing support shaft rotatably inserted through a lifting boss portion through a swing boss portion, and an upper bearing portion is attached to an upper end portion of the hitch main body by a swing support shaft. On the other hand,
At the lower end, the lower bearing is located below the swing support shaft, and the upper and lower
The lower connecting pin is detachably engaged to enable connection.

In this way, the swing operation and the attachment / detachment of the working device can be reliably performed with a simple structure.

[0014]

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

A shown in FIG. 1 is a working machine according to the present invention. In the working machine A, a tilling device C as a working device is connected via a lifting mechanism D to the rear of a traveling vehicle body B.

As shown in FIG. 1, a traveling body B has a body frame 2 interposed between a pair of left and right crawler traveling parts 1 and 1, and a driving part 3 is provided on the body frame 2 at the front.
And a prime mover unit 4 and a transmission unit 5 are vertically arranged at the rear, and the traveling units 1 and 1 are connected to the prime mover unit 4 via the transmission unit 5 in an interlocked manner.

The traveling section 1 has a front driven wheel 11 attached to a front end of a traveling frame 10 extending in the front-rear direction via an idler fork 12, a rear driven wheel 13 attached to a rear end, and a transmission section. A driving wheel 15 is interlocked to the driving wheel 5, and a crawler belt 16 is wound around the driving wheels 11, 13, and 15. On the lower side of the traveling frame 10, three rolling wheels are provided at intervals in the front-rear direction. 17 is installed. 11a is a front driven wheel support shaft, 13a is a rear driven wheel support shaft, 15a is a drive shaft, and 18 is a drive shaft support frame.

The vehicle body frame 2 has a front left-right connecting frame 19 extending between the front portions of a pair of left and right running frames 10 extending in the front-rear direction. A pair of right and left extension frames 21 and 21 are laid between the front and rear left and right connection frames 19 and 20 with the rear left and right connection frame 20 interposed therebetween.
A guard frame 22, which is formed in a rectangular frame shape in a plan view, is laterally formed on the front and rear extension frames 21, 21.

The operating unit 3 has a floor 23 extending in the front half of the guard frame 22 and a handle column 24 on the front of the floor 23.
A handle 27 (steering wheel) is attached to the handle column 24 via a handle support shaft 26, and a seat 27 is disposed at a position behind the handle 25. Various operation levers are arranged at the side position.

A control unit 28 for controlling the attitude of the working device, which will be described later, is provided below the seat 27.

The engine unit 4 is provided with an engine E at a position behind the seat 27, and the transmission unit 5 is interlocked to an output shaft 30 of the engine E via a first transmission mechanism 31 and a chain case 32. And a PTO shaft described later on the output shaft 30.
33 is interlockingly connected via a second transmission mechanism 34.

As shown in FIG. 2, the PTO shaft 33 is provided between the middle portions of the rising frames 21a, 21a formed by raising the rear portions of the pair of left and right longitudinally extending frames 21, 21 upward. An input pulley that extends horizontally and extends through the coaxial receiving pipe 35 and forms a part of the second transmission mechanism 34 at the left end of the PTO shaft 33.
A transmission mechanism 37 is interposed between the right end of the PTO shaft 33 and an input shaft 36 of the tilling device C to be described later.

In the tilling apparatus C, as shown in FIGS. 1 and 2, a connecting body 41 is attached to an upper end portion of a vertically extending chain case 40, and an input shaft 36 projects outward from an upper side wall. The transmission mechanism 37 is connected to the right end of the input shaft 36 in an interlocking manner, while the lower end of the chain case 40 is penetrated by a cultivating shaft 43 oriented in the left-right direction. A plurality of 44s are attached along the axis of the tilling shaft 43. 40a is an output sprocket, 40b is an input sprocket, 40c is a transmission chain, 45 is an input shaft case, 46 is a side cover, 47 is a rear cover, and 48 is a hanger rod.

As shown in FIGS. 2 and 3, the transmission mechanism 37 includes a pair of front and rear gear cases 50 and 51, and both gear cases 50 and 51.
A transmission shaft 52 interposed between the transmission shaft 51 and the transmission shaft 52
And a shaft cover 53 that covers the outer circumference of the shaft.

The front gear case 50 has a first input gear 54 removably spline-fitted to the right end of the PTO shaft 33.
A first output gear 55 meshed with the first input gear 54,
A first output shaft 56 supporting the first output gear 55 and a first output shaft 56 are accommodated in a first case body 57.

The first case body 57 is provided with a first connection receiving member 58 attached to a lifting arm 80 of a lifting mechanism D which will be described later.
Are detachably connected to each other via a first connection piece 59. 58a
Is a female screw portion, 59a is a first bolt insertion hole, 60 is a first connection bolt, and 61 is a first washer.

The rear gear case 51 has a second input gear removably spline-fitted to the right end of the input shaft 36.
66 and a second output gear 67 meshed with the second input gear 66
And a second output shaft 68 supporting the second output gear 67 are housed in a second case body 69.

The second case body 69 is detachably connected to a second connection receiver 70 attached to the input shaft case 45 via a second connection piece 71. 70a and 71a are second and third bolt insertion holes, 72 is a second connection bolt, 73 is a nut, and 74 is a second washer.

The transmission shaft 52 is provided between a first universal joint 75 attached to the first output shaft 56 and a second universal joint 76 attached to the second output shaft 68 via a shaft body 77 formed to be extendable and contractible. It is set up and configured.

Thus, the front and rear gear cases 50,
Reference numeral 51 is removably linked to the PTO shaft 33 and the input shaft 36 so that the transmission mechanism 37 can be moved back and forth.

In addition, since the transmission mechanism 37 makes the transmission shaft 52 extendable and retractable and can be bent inside, the lifting mechanism D
Thereby, even when the tillage device C is moved up and down, the connected state can be kept good, and the transmission function can be secured well.

Here, the gear ratios of the first input / output gears 54, 55 provided in the front gear case 50 and the second input / output gears 66, 67 provided in the rear gear case 51 are different. The gears 50 and 51 are switched back and forth to
By interlockingly connecting the TO shaft 33 and the input shaft 36, the PT
The power transmitted from the O-shaft 33 to the input shaft 36 can be changed.

The lifting mechanism D is, as shown in FIGS.
The front end of the elevating arm 80 is pivotally supported on a bearing pipe 35 supporting the PTO shaft 33 via a boss portion 81 for pivoting, so that the elevating arm 80 can be vertically rotated. ,
An elevating cylinder 82 is interposed between the rear portion of the guard frame 22 and the elevating arm 80 is turned up and down around the axis of the PTO shaft 33 in conjunction with the expansion and contraction operation of the elevating cylinder 82. It moves and moves up and down.

A swing boss 83 is attached to the rear end of the elevating arm 80 with its axis oriented in the front-rear direction, and a swing support shaft 84 is rotatable around the axis in the swing boss 83. And a hitch body 85 is attached to the rear end of the swing support shaft 84, and the hitch body 85 and the lifting arm
An electric attitude holding cylinder 86 whose axis is oriented in the vertical direction as an attitude holding means is interposed between it and the position holding means 80, and the hitch body 85 swings in conjunction with the expansion / contraction operation of the attitude holding cylinder 86. A swing operation of swinging about the support shaft 84 is performed. 87 and 88 are cylinder connection brackets, 89
Is a connection code.

The hitch body 85 is positioned above the swing support shaft 84 at the upper end of a hitch body 90 formed in a rectangular frame shape, and a pair of left and right connecting pin receiving recesses 91, as upper bearings, is provided.
On the other hand, at the lower end of the hitch body 90, a locking hook 92 is provided below the swing support shaft 84 and serves as a lower bearing.

At the lower end of the hitch main body 90, a hook support shaft 93 whose axis is oriented in the left-right direction is horizontally rotatably mounted around the axis through a pair of left and right shaft support bosses 94, 94. ,
A locking hook 92 is attached to the hook support shaft 93 in the middle part toward the rear, and a connecting arm 95 protrudes forward from the locking hook 92, and the connecting arm 95 and the hitch main body. 90
A locking spring 96 and a guide body 97 are interposed between the hook support shaft 93 and the unlocking lever.
The lower end of 98 is attached. 96a and 96b are spring retaining pieces.

Here, the above-mentioned tillage device C is detachably connected to the above-mentioned hitch body 85 via a connecting member 41. As shown in FIG. A pair of left and right upper connecting pins 100, 100 with their axes oriented in the left-right direction is provided, while a lower connecting pin 101 with their axes oriented in the left-right direction is provided below.

As described above, the upper connecting pins 100, 100 of the connecting body 41 are engaged with the connecting pin receiving recesses 91, 91 of the hitch body 85 from above, and the lifting mechanism D is raised in the same state. The tillage device C is rotated downward by its own weight around the upper connecting pins 100, 100, and the lower connecting pins 101 are locked by the locking hooks 92, so that the connecting operation can be completed easily.

When disconnecting the tillage device C from the hitch body 85, the locking release lever 98 is rotated forward against the urging of the locking urging spring 96.
The locking hook 92 can be released from the lower connecting pin 101, and if the elevating mechanism D is lowered in the same state, the connecting pin receiving recesses 91, 91 are engaged with the upper connecting pins 100, 100. The connection is released, and the connection release operation can be easily completed.

At the center of the upper end of the hitch body 85, a swing detecting sensor 110 as a detecting means for detecting the attitude of the traveling vehicle body B is attached via a sensor stay 111. , Above the swing support shaft 84 and in front of the hitch body 85.

In this manner, the left-right swinging motion of the traveling vehicle body B can be detected by the swing detecting sensor 110. At this time, the swing detecting sensor 110 is located above the swing support shaft 84. Position and in front of the hitch body 85, it is not necessary to remove the rocking detection sensor 110 one by one when the tilling device C is separated from the traveling vehicle body B. 110 can prevent the tilling and scattering of soil, etc.
The influence of the lateral swing of the traveling body B on the vehicle 110 can be reduced as much as possible.

The swing detection sensor 110 is connected to the input side of the control unit 28, and the above-mentioned motorized attitude holding cylinder 86 is connected to the output side of the control unit 28.

As described above, when the traveling vehicle body B swings right and left during the tilling work by the tilling device C, the swing detecting sensor 110 detects the operation, and the detection result is obtained. Is output to the control unit 28, and a signal is output from the control unit 28 to the attitude holding cylinder 86, and the attitude holding cylinder 86 is output.
By extending and retracting the 86, the hitch body 85 can be swung about the swing support shaft 84 (left-right swinging operation) so that the tilling device C can be held in a horizontal posture with respect to the tilling surface. I have.

Accordingly, in the tilling operation by the tilling device C, the tilling depth can be kept constant, and the tilling operation efficiency can be improved.

[0045]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the hitch body is rotatably attached to the lifting mechanism via the swing support shaft whose axis is oriented in the front-rear direction, and the work is performed on the hitch body. The work equipment swings around the swing support shaft even when the running vehicle swings left and right under the influence of the unevenness formed in the field scene because the device is detachably mounted, and the fixed posture , And good work performance can be secured.

According to the second aspect of the present invention, the PTO shaft is disposed on the traveling vehicle body with its axis oriented in the left-right direction.
Since the lifting mechanism is vertically rotatable around the axis of the shaft, the members supporting the rotation fulcrum of the PTO shaft and the lifting mechanism can be shared, and a compact structure can be achieved.
Manufacturing cost can be reduced.

According to the third aspect of the present invention, the hitch body is attached to the swing support shaft rotatably inserted into the lifting mechanism via the swing boss, and the hitch body is mounted on the upper end of the hitch body at the upper end. The bearing portion is provided above the swing support shaft, while the lower bearing portion is provided at the lower end portion below the swing support shaft, and the upper and lower bearing portions are provided on the working device. -Since the lower connection pin is detachably engaged to be connectable, the swing operation and the attachment / detachment of the working device can be reliably performed with a simple structure.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional plan view showing a power transmission structure between a traveling vehicle body and a tillage device.

FIG. 3 is a sectional plan view of a transmission mechanism.

FIG. 4 is a side view of a lifting mechanism.

FIG. 5 is a plan view of the lifting mechanism.

FIG. 6 is a rear view of the lifting mechanism.

FIG. 7 is a rear view of the lifting arm.

FIG. 8 is an exploded plan view of the lifting mechanism, the hitch body, and the connecting body.

[Explanation of symbols]

 Reference Signs List A Working machine B Running body C Cultivating device D Lifting mechanism 1 Running section 2 Body frame 3 Operating section 4 Engine section 5 Transmission section

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masahiro Shimazoe 428 Enami, Onami, Okayama Pref.Seirei Industry Co., Ltd. (72) Inventor Katsumi Fujiki 428 Enami, Okayama City, Okayama Pref. Inventor Takao Oniki 428 Enami, Okayama-shi, Okayama Pref. (72) Inventor Yoichi Hiroshige 428 Enami, Okayama-shi, Okayama F-term (reference) 2B304 KA11 LA02 LA05 LB05 LC05 MA08 MB02 MC06 PD31 QA01 QC01

Claims (3)

[Claims] 1. A working device is connected to the rear of a traveling vehicle body (B) via an elevating mechanism (D), and the traveling vehicle body (B) comprises a pair of left and right crawler traveling units (1, 2).
1) A body frame (2) is interposed between them, and the body frame (2)
A driving unit (3), a motor unit (4), and a transmission unit (5) are provided on the top, and the running unit (1,1) is interlocked to the driving unit (4) via a transmission unit (5). In the working machine, the hitch body (85) is attached to the lifting mechanism (D) via a swing support shaft (84) whose axis is oriented in the front-rear direction so as to be rotatable about the swing support shaft (84), A work machine characterized in that a work device is detachably attached to the hitch body (85). 2. A PTO shaft (33) is disposed on a traveling vehicle body (B) with its axis oriented in the left-right direction, and a lifting mechanism (D) is rotatable up and down around the axis of the PTO shaft (33). The working machine according to claim 1, wherein: 3. The hitch body (85) has a hitch body (90) attached to a swing support shaft (84) rotatably inserted through a lifting boss (83) through a lifting mechanism (D). Hitch body
At the upper end of (90), the upper bearing is provided above the swing support shaft (84), while at the lower end, the lower bearing is provided below the swing support shaft (84), The upper and lower connecting pins (100, 10
The working machine according to claim 1 or 2, wherein the working machine (0, 101) is detachably engaged to be connectable.