JP2000157005A - Rotary tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a stand and front cover in a rotary tiller of side drive type and protect the link of a coupling device with the rotary tiller. SOLUTION: In this rotary tiller, a stand bracket 111 is fixed to a chain case 6, a stand 110 is supported by the stand bracket 111, the side of a fulcrum of the stand 110 is constituted of a slotted hole 10a, while the stand 110 is constituted in a U-shape in its sectional view and a spring for a detent is put inside of the stand. A front cover 125 is supported at four positions of the chain case 6, side supporters 129 and a main beam 127, the supported positions are brought to be outside of a lower link-fixing position and a binding device is assembled from one direction. The link fulcrum is arranged to a device for automatically detaching an automatic wire so that the fulcrum lies in front of a line connecting a linking point of a rotary top link and a fixing point of the lower link, above the fixing point of the lower link and inside of the lateral direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rotary tiller.

[0002]

2. Description of the Related Art Conventionally, there has been known a technique in which a hitch device is arranged on a work machine mounting device at the rear of a tractor so that the work machine can be easily mounted. When attaching and detaching the work machine, the work machine mounting device and the power transmission mechanism can be attached and detached at the same time.However, when performing tillage depth control using the rear cover as a sensor, feedback that transmits the amount of rotation of the rear cover is used. The wire (or a rod for transmitting the amount of movement of the rear cover) is attached to and removed from the tractor by an operator. However, if the operator forgets to remove the connection portion of the feedback wire when removing the work implement, there is a problem that the feedback wire or the like is lost.

In order to solve such a problem, a technique for automatically attaching and detaching a feedback wire or the like is known. For example, there is Japanese Utility Model Publication No. 8-4815. this is,
The feedback wire is divided back and forth, the front feedback wire for transmitting to the tillage depth control unit is connected to a swingable link on the tractor side, and an interlocking pin is pivotally supported on the ring. On the other hand, a hook for receiving is formed on the swingable link on the working machine side, and the rear wire is connected to the link,
When the work implement is mounted, the pin on the ring is engaged with the hook, and the link on the tractor side and the link on the work implement side are linked to transmit the operation amount of the rear cover. In addition, real fairness 4
The roller provided on the tractor-side oscillating link is in contact with the side surface of the work-unit-side oscillating link as shown in US Pat. Is also known.

[0004] The rotary tiller is provided with a stand for standing when the rotary tiller is removed from the working vehicle. The stand of the rotary tiller is welded to a rotary cover or a chain case. I have.

[0005] The rotary tiller is provided with a front cover at the front, and the front cover is configured to be suspended by two stays provided on the main beam.

[0006]

SUMMARY OF THE INVENTION
In the technology disclosed in No. 4815, a certain amount of play is required for the pins on the link on the tractor side to smoothly enter and exit the receiving hook, and this play becomes a dead zone, which adversely affects tillage depth control. It is.

When the stand is welded to a rotary cover or a chain case, if the stand is damaged,
Both the rotary cover and the chain case may be damaged. Further, when replacing the member supporting the stand, it is necessary to replace both the rotary cover and the chain case.

[0008] Since there are few places to attach the front cover, it is necessary to increase the rigidity of the front cover, and the plate thickness of the front cover is increased and the weight is increased.

[0009]

The present invention uses the following means to solve the above-mentioned problems in the conventional rotary tilling machine. First, as described in claim 1, in a rotary tiller of a side drive type, a flange portion is provided on a chain case, a stand bracket is fixed to the flange portion using a binding tool, and the stand is supported on the stand bracket. The fulcrum side of the stand is formed as an elongated hole, and a spring for detent is provided inside the stand so that the stand can be held at the stand operating position and the stand storage position.

According to a second aspect of the present invention, in the side cultivator of the side drive type, the front cover of the rotary cultivator is fastened and supported by a tying tool at four places of a chain case, a side supporter and a main beam. The fastening position is set outside the lower link mounting position, and the binding device is configured to be able to be assembled from one direction.

According to a third aspect of the present invention, in a side drive type rotary cultivator having an automatic wire attaching / detaching device, a link fulcrum of the automatic wire attaching / detaching device is a line connecting a rotary top link connecting point and a lower link attaching point. It is located on the front side, above the lower link mounting position, and inside in the left-right direction.

[0012]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a side view showing a rotary cultivator mounted on a work vehicle, FIG. 2 is a plan view of the rotary cultivator, FIG. 3 is a side view of a connecting device, FIG. 4 is a rear view of the connecting device, and FIG. FIG. 6 is a side view of a rotary tiller, FIG. 7 is a plan view of the same, FIG. 8 is a plan view of a stand, FIG.
Is a side view showing the configuration of the stand bracket, FIG. 11 is a side view showing the rotation of the stand, FIG. 12 is a plan view showing the support configuration of the right end of the front cover, and FIG. 13 is a plan view showing the support configuration of the center portion of the front cover. FIG. 14, FIG. 14 is a side view showing a link mechanism of a rotary tiller, FIG. 15 is a side view showing a configuration of a rear cover, FIG. 16 is a plan view of the same, FIG. FIG.
8 is a side view of the same.

The configuration of the rotary tiller will be described with reference to FIGS. A rotary tiller 100 is connected to the rear of the work vehicle, and the rotary tiller 100 is driven by a part of the output of the engine 105 of the work vehicle. The working vehicle has front and rear wheels 101 and rear wheels 102.
A hood 106 is provided at a front portion of a main body for suspending the engine, and an engine 105 is provided inside the hood 106. A steering handle 10 is provided behind the hood 106, and a seat 98 is provided behind the steering handle 10. Further, a main speed change lever is protruded from a side portion of the seat 98. The steering handle 10 and the seat 98 are covered by a cabin 97.

A transmission case 109 is disposed behind the engine 105, and the power from the engine 105 is supplied to the rear wheel 1
02 to be driven. However, depending on the operation,
It is also possible to adopt a four-wheel drive for transmitting the driving force to the front wheel 101 at the same time.

The driving force of the engine 105 is transmitted to a PTO shaft 15 protruding from the rear end of the transmission case 109 to drive the PTO shaft 15 to drive a working machine connected to the rear end of the machine body. I have.

Behind the work vehicle, a rotary tiller 100
Is connected, and the rotary tiller 100 has a PTO
The driving force is transmitted from the shaft 15 and the rotary tiller 100
Is driven. Further, the rotary tiller 100 is connected to the work vehicle through the connection device 20, and the vertical position and the left and right inclination angles of the rotary tiller 100 can be adjusted by an elevating device provided in the work vehicle. .

Next, a connecting device 20 for connecting the rotary tiller 100 to a work vehicle will be described with reference to FIGS. A work implement mounting device including an upper link and a lower link is attached to a rear portion of the work vehicle, and a detachable connecting device 20 is disposed at a rear portion of the upper link and the lower link. The rotary tillage device 100 is mounted with one touch by using the connection device 20. The coupling device 20 includes a bracket 21 pivotally supported at a rear portion of the lower link, an arch-shaped coupling frame 22 fixed to the left and right brackets 21,
The connecting support member 23 is fixed to the upper center portion, and the front portion of the connecting support member 23 is pivotally supported by the rear portion of the upper link.

A recess 23a is formed at the rear of the connection support member 23.
The mast pin 3a on the mast 3 of the rotary tilling device 100 described later is detachably engaged with the concave portion 23a. Also, each lower link bracket 4 provided on both sides of the gear box 5 of the rotary tilling apparatus 100 described below.
The link pins 4a provided at the front of the bracket 4 are engaged with hooks formed at the rear of the bracket 21. The rotary tiller 100 is attached to the bracket 21.
A link arm 51 for transmitting a rotation amount of a rear cover described later to the work vehicle side is provided. The link arm 5
1 forms a transmission part 39 together with the automatic wire automatic attachment / detachment device link 60 of the rotary tiller 100. As a result, the amount of rotation of the rear cover of the rotary tiller 100 is transmitted to the work vehicle.

Next, in FIG. 6 and FIG.
00 will be described. The rotary tiller 100 is provided with a gear box 5 for driving the rotary tiller 100. The gear box 5 has an input shaft 24 protruding forward connected to a claw clutch mechanism (not shown). Is connected to the PTO shaft 15 of the tractor via a universal joint with a pawl clutch mechanism (not shown) of the connecting device 20, and when the rotary tilling apparatus 100 is mounted, the two pawl clutch mechanisms are engaged at the same time, and the power is transmitted to the gearbox 5. I am trying to be. The driving force input to the gear box 5 is transmitted to the chain case 6 via the main beam 127, and the tilling claws 7, 7... It can be driven.

A front end of a depth frame 9 is pivotally supported at the rear of the gear box 5 so as to be vertically rotatable, and another working machine, a tail wheel, and the like can be mounted on the rear end of the depth frame 9. Further, a support pipe 11 is provided in the middle of the depth frame 9, a stay protrudes upward from the support pipe 11, and a screw rod 14 is interposed between the stay and a rear upper portion of the mast 3. Screw rod 14 is handle 15
The depth frame 9 can be turned up and down by expanding and contracting by the turning operation of.

A tillage cover 16 is arranged above the rotation locus of the tillage claw 7, and a rear cover 17 is pivotally supported at the rear of the tillage cover 16. The till cover 16 is
The tilling cover 1 is pivotally supported so as to be rotatable around the cultivating claw shaft 8.
6 A stay 13 is provided at the left and right center of the rear,
A screw rod 18 is interposed between the mast 3 and the central part of the mast 3, and the till cover 16 and the rear cover 17 are rotated back and forth by expanding and contracting the screw rod 18 by rotating the handle 19, thereby achieving the desired purpose. It can be adjusted manually according to the plowing depth.

A lower portion of the guide rod 28 is pivotally supported at an upper and lower portion of the rear cover 17, while a sliding support bracket 29 is provided so as to project rearward and upward from a rear portion of the tillage cover 16. The boss portion 30 is pivotally supported on the guide rod 28 so as to be slidable in the boss portion 30.
And guides the vertical movement of the rear cover 17.

A base stay 31 is fixedly mounted on the side of the slide support bracket 29, and a middle part of the sensing rod 32 is supported by the base stay 31 so as to be slidable up and down. The lower part of the sensing rod 32 is connected to a stay 33 projecting from the rear surface of the rear cover 17, and the sensing rod 32 is slid up and down with the vertical rotation of the rear cover 17.

A feedback wire 40 is connected between the rear cover 17 and the hydraulic control device for raising and lowering the work vehicle, and the feedback wire 40 is connected to the outer case 41.
Is stored and protected. The feedback wire 40 and the outer case 41 are configured to transmit the movement of the rear cover 17 to a sensor of the work vehicle via a link mechanism 39 provided at the connection device 20.

Next, the structure of the stand 110 provided in the rotary tiller 100 will be described with reference to FIGS. A stand 110 of the rotary cultivator 100 is provided at a lower front portion of the chain case 6 of the rotary cultivator 100, and the stand 110 is fixed to the chain case 6 via a bracket 111 projecting forward of the chain case 6. Has been established. The bracket 111 is formed in a U-shape in plan cross section, and is configured to be disposed with the opening of the bracket 111 facing forward. The chain case 6 is provided with a flange portion, and a bracket 111 is fixed to the chain case 6 with a bolt on the flange portion. The bracket 111 is fixed to the chain case 6 together with a stay 126L for supporting a front cover 125 described later.

The bracket 111 has a pin 112
Is fixed. The stand 11 is attached to the bracket 111.
0 is included, and the pin 112 is provided on the bracket 111 so as to protrude left and right.
The end of the stand 110 is inserted into 2. An elongate hole 110a is provided at one end of the stand 110,
The pin 112 is inserted into the elongated hole 110a. A beta pin is attached to the tip of the pin 112 into which the stand 110 is inserted, and the pin 112 is
It is configured to prevent it from falling off.

The stand 110 has a U-shape in cross section, and a detent spring 110b is provided inside the stand 110. One end of the spring 110b is engaged with the pin 112, and the other end is
The pin 110c is fixed to the pin 110c. The pin 110c penetrates the stand 110 from the left and right directions, and both ends of the pin 110c protrude from the left and right side surfaces of the stand 110. For this reason, the stand 110 is provided by a spring 110c provided inside the stand 110.
The ten pins 110c are configured to be pressed against the bracket 111. In addition, the stand 110 may be formed of a square pipe or a round pipe.

The bracket 111 has recesses 111b and 1 at positions corresponding to the use position and the storage position of the stand 110.
11a, and the pin 11 of the stand 110 is provided.
The stand 110 is held at the set position by fitting the recesses 0c into the recesses 111b or 111a. The recess 111a at the storage position is provided on the upper part of the bracket 111, and the recess 111b at the use position is provided on the lower part of the bracket 111. For this reason, the stand 110 is pivotally moved upward to be accommodated, and is movable downward, so that the rotary tiller 100 can be supported by the stand 110 so as not to fall down.

Since an elongate hole 110a is formed at the end of the stand 110 where the pin 112 is inserted, the other end of the stand 110 is pulled so that the stand 11
0 is slid and the pin 1 fixed to the stand 110 is
10c is pulled out from the concave portion 111b or the concave portion 111a, and the stand 110 can be rotated.

As in the above configuration, the stand 110 is configured to be supported by the bracket 111. If an excessive force is applied to the stand 110, the stand 110 or the bracket 111 is deformed and received. The chain case 6 is not affected. In addition, since the stand 110 and the bracket 111 have a simple configuration, the cost of the stand 110 and the bracket 111 can be reduced. Also, the stand 110
Of the stand 11 by providing a slot 110a at one end of the
0, the detent mechanism can be easily configured.
10 can have high durability and can be easily assembled.

Next, the structure of the front cover is shown in FIG.
This will be described with reference to FIGS. Rotary tiller 10
0, a front cover 125 is provided in front of
The front cover 125 is fixed to the chain case 6, the side supporters 129, and the main beam 127. Each of the front covers 125 is a chain case 6
Is connected to the side supporter 129 via a stay 126R. As shown in FIG. 8, a stay 126L fixed to the chain case 6 is fixed to the left end of the front cover 125. In this embodiment, the front cover 125 is fixed to the stay 126L by bolts, but the invention is not particularly limited to bolts as long as the front cover 125 can be fixed to the stay 126L. As shown in FIG. 12, a stay 126R is fixed to the side supporter 129,
A front cover 125 is fixed to the stay 126R.

The main beam 127 has a bracket 128
Are integrally formed or fixed by welding, and are formed in a shape projecting forward and upward. The stay 126 has a screw hole, and the bracket 128 has a stay 12.
6 is fixed by bolts. The mounting directions of the bolts are the stays 12 arranged on the left and right of the rotary tiller 100.
6 is constant. That is, since the mounting direction of the stay 126 is one direction, the stay 12
6 can be easily attached and detached.

A stay 126 for supporting the front cover 125 is provided on the outer side in the left-right direction with respect to the pair of lower link brackets 4 provided above the rotary tiller 100. Thereby, it is possible to widen the space for connection when the rotary tiller 100 is mounted on the work vehicle. As described above, the front cover 125 is supported at four places: a stay 126L fixed to the chain case 6, a stay 126R fixed to the side supporter 129, and stays 126 fixed to the main beam 127. Therefore, the thickness of the front cover 125 can be reduced. Accordingly, the front cover 125 can be easily formed, and the design of the front cover 125 can be improved. Further, since the front cover 125 is supported at four positions, the vibration of the front cover 125 can be reduced, and a decrease in durability due to the vibration of the front cover 125 can be suppressed.

Next, an automatic wire automatic attachment / detachment device link 60
Will be described with reference to FIGS. The automatic wire attachment / detachment device link 60 is connected to the auto wire link bracket 13 fixed to the lower link bracket 4.
2 is pivotally supported at the front end, and a feedback wire 4
0 is connected. The feedback wire 40 is housed in an outer wire case 41 having one end fixed to a stay 131 fixed to the lower link bracket 4. Is configured to rotate.

As shown in FIGS. 15 and 16, the sensing rod 32 whose one end is rotatably supported by the rear cover 17 with the rotation of the rear cover 17 is rotatable by a sliding support bracket 29 at the upper part. Is inserted into the base stay 31 pivotally supported by. The outer wire case 41 is fixed to the base stay 31, and the feedback wire 40 housed in the outer wire case 41 is connected to the upper end of the sensing rod 32.
As a result, the rotation of the rear cover 17 is controlled by the automatic wire automatic attaching / detaching device link 60 by the feedback wire 40.
Is transmitted to When the rotary tiller 100 is mounted on the connection device 20, the automatic wire automatic attachment / detachment device link 60 comes into contact with the link arm 51 of the connection device 20. A wire is connected to the link arm 51, and the automatic wire automatic attaching / detaching device link 60 is provided.
Is transmitted to the detection device of the work vehicle.

In the above configuration, the rotation fulcrum of the automatic wire automatic attaching / detaching device link 60 is located at a position forward of a line connecting the mast pin 3a as the rotary top link connection point and the link pin 4a as the lower link attachment point. ing. The automatic wire automatic attaching / detaching device link 6
Numeral 0 is disposed above and inside the link pin 4a, which is the lower link attachment point. For this reason, the fulcrum of the link arm 51 of the connecting device 20 that comes into contact with the automatic wire automatic attaching / detaching device link 60 is connected to the mast pin 3 a
Is located forward of a line connecting the concave portion 23a of the connection support member 23 and the hook portion of the bracket 21 with the link pin 4a.

In the connecting device 20, the connecting support member 23 and the bracket 21 protrude rearward, and the mast 3 protrudes forward in the rotary tiller 100.
And the lower link bracket 4. When connecting the rotary tiller 100 to the connecting device 20, the connecting device 2
0 and adjust the position of the mast pin 3a to the connecting support member 23.
Lock. The automatic wire automatic attaching / detaching device link 60 is disposed above and inside the lower link bracket 4,
Since the configuration is protected by the lower link bracket 4, there is little possibility of contact with the bracket 21 during the above operation. Further, as described above, the link arm 51 of the coupling device 20 is protected because the fulcrum position is located behind the line connecting the concave portion 23a and the engaging position of the link pin 4a of the hook portion.

According to the above configuration, the automatic wire automatic attachment / detachment device link 60 and the connecting device 20 on the rotary tiller 100 side until the mounting position of the rotary tiller 100 is determined.
Side link arms 51 do not contact each other. Also, the automatic wire automatic attaching / detaching device link 60 and the link arm 5
1 can be prevented.

[0039]

According to the present invention, since the rotary tiller is configured as described above, the following effects can be obtained. First, as in claim 1, in a rotary tiller of a side drive type, a flange portion is provided on a chain case, a stand bracket is fixed to the flange portion using a binding tool, and a stand is supported on the stand bracket, Since the fulcrum side of the stand is configured as a long hole, a detent spring is provided inside the stand, and the stand can be held at the stand operating position and the stand storage position.
Even when the stand is hooked, a stand bracket separate from the chain case is interposed, and the rotary cover and the chain case are not damaged. Further, since a long hole is provided on the fulcrum side of the stand to constitute the detent mechanism, the durability can be improved with a simple configuration.

According to a second aspect of the present invention, in the side drive type rotary cultivator, the front cover of the rotary cultivator is fastened and supported at four locations of a chain case, a side supporter and a main beam by a tying tool. The fastening position is located outside the lower link mounting position, and the binding device is configured to be able to be assembled from one direction, so that the front cover has a large number of supporting portions and the strength is secured, so that the thickness of the front cover can be reduced.
Further, the vibration resistance of the front cover can be improved. Since the mounting direction of the front cover is one direction, the mounting and dismounting of the front cover can be facilitated. Since the mounting position of the front cover is disposed outside the lower link bracket, the space of the link portion when the rotary cultivator is mounted can be widened.

According to a third aspect of the present invention, in the rotary tiller of the side drive type having the automatic wire attaching / detaching device, the link fulcrum of the automatic wire attaching / detaching device is a line connecting the rotary top link connecting point and the lower link attaching point. Since it is arranged on the front side and above the lower link mounting position and inside in the left and right direction, when connecting the rotary tiller with the connecting device at the time of attachment and detachment, the link on the rotary tiller and the link on the connecting device side Does not interfere.
This can prevent the link mechanism from being damaged.

[Brief description of the drawings]

FIG. 1 is a side view showing a rotary cultivator mounted on a work vehicle.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of the coupling device.

FIG. 4 is a rear view of the same.

FIG. 5 is a side view of the rotary tiller with the connecting device mounted.

FIG. 6 is a side view of the rotary tiller.

FIG. 7 is a plan view of the same.

FIG. 8 is a plan view showing a stand.

FIG. 9 is a partial side sectional view of the same.

FIG. 10 is a side view showing a configuration of a stand bracket.

FIG. 11 is a side view showing the rotation of the stand.

FIG. 12 is a plan view showing a support structure of a right end portion of the front cover.

FIG. 13 is a plan view showing a support configuration of a central portion of a front cover.

FIG. 14 is a side view showing a link mechanism of the rotary tiller.

FIG. 15 is a side view showing the configuration of the rear cover.

FIG. 16 is a plan view of the same.

FIG. 17 is a plan view showing a configuration of an automatic wire automatic attaching / detaching device link.

FIG. 18 is a side view of the same.

[Explanation of symbols]

 3 Mast 3a Mast pin 4 Lower link bracket 4a Link pin 6 Chain case 51 Link arm 60 Automatic wire automatic attachment / detachment device link 110 Stand 111 Bracket 125 Front cover 126 Stay

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2B033 AA05 AC05 DB04 DB37 DB39 ED02 ED14 ED15 2B041 AA03 AA09 AB05 AC03 CA16 CC11

Claims (3)

[Claims] 1. A side drive type rotary cultivator, wherein a flange is provided on a chain case, a stand bracket is fixed to the flange using a binding tool, and the stand is supported on the stand bracket. A rotary tiller having a long hole on the side, a spring for a detent provided inside the stand, and capable of being held at a stand operating position and a stand storage position. 2. A side drive type rotary cultivator, wherein a front cover of the rotary cultivator is fastened and supported by a tying tool at four locations of a chain case, a side supporter, and a main beam, and the fastening position is a lower link mounting. A rotary tilling machine, wherein the tying tool is arranged outside the position so that the binding tool can be assembled from one direction. 3. A side-drive rotary cultivator having an automatic wire attaching / detaching device, wherein a link fulcrum of the automatic wire attaching / detaching device is located forward of a line connecting a rotary top link connection point and a lower link attachment point, A rotary tiller, which is disposed above a lower link mounting position and inside in a left-right direction.