JP5363038B2 - Rotary tillage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve maintenance ability and operability of a rear cover-regulating device. <P>SOLUTION: The rotary tiller 1 equipped with a rear cover 8 connected to the rear terminal part of a main cover 7 and covering the rear part of a rotary tilling part 6, and a hanging rod 9 installed between the rear cover 8 and the main cover 7 is further equipped with a rear cover-regulating means 14 capable of switching a free state allowing the upper and lower turning of the rear cover 8, a locked state for restricting the upper and lower turning of the rear cover 8, and a lowering-restricting state for restricting the turning in the lowering direction while allowing the turning in the lifting direction of the rear cover 8, and an operation means 15 for carrying out the switching operation of the rear cover-regulating means 14 to each state. The operation means 15 enables the operation of the rear cover-regulating means 14 without using a wire, and when the weight of the rear cover 8 acts on a lock pin 16, only the position of an operation pin 18 can be subjected to changing operation while keeping the position of the lock pin 16. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rotary tiller device mounted on a traveling machine body such as a tractor.

  Conventionally, a rotary tillage device includes a rotary tillage portion configured by attaching a number of tillage claws on a rotary shaft that rotates by receiving power from a traveling machine body, and a rotary tillage cover that covers the rotary tillage portion. Used for surface tillage. The rotary tillage cover has a main cover that is fixed to the rotary machine frame and covers the upper part of the rotary tillage part, and a rear cover that is connected to the rear end part of the main cover so as to be vertically rotatable and covers the rear of the rotary tillage part. And prevents scattering of cultivated soil cultivated in the rotary tillage section.

  The rear cover is used for various purposes other than preventing scattering of tillage soil. For example, when fixing the rear cover in the lowest state, such as when scraping, pressing the farm scene simultaneously with plowing and finishing the tilled soil flatly, or connecting a vertical stand behind the rotary tiller, The rear cover is fixed to the middle stage when setting up by cultivating soil. Also, during cleaning and maintenance such as removing mud adhering to the rotary tillage part, the rear cover is fixed to the upper stage so as not to interfere with cleaning and maintenance. Further, when the rotary tiller main body is removed from the tractor hitch and accommodated in a hangar or the like, the rear cover may be used as a rotation stop of the main body.

  The rear cover used for these purposes is connected and supported to the main cover via a rear cover adjusting means that can be fixed at an arbitrary rotational position. For example, in the rear cover adjusting means disclosed in Patent Document 1, a suspension rod connected to the rear cover is fitted and supported in a mounting bracket provided in the main cover, and a lock pin is advanced and retracted from the mounting bracket in an engagement hole formed in the suspension rod. The rear cover can be fixed by engaging with each other. And the rear cover adjustment means of patent document 1 is connected to the operation tool attached to the top mast of the rotary tilling device via a wire, and the operation according to each tilling work is possible by the worker on the traveling machine body. ing.

Further, the rear cover adjusting means of Patent Document 1 is not only in a locked state in which the vertical rotation of the rear cover is restricted at an arbitrary rotation position (engagement hole corresponding position), but also in a free state in which the vertical rotation of the rear cover is allowed, A lower restriction state that restricts rotation in the lowering direction while allowing rotation in the raising direction of the rear cover can be realized.
JP 2008-43230 A

  However, since the rotary tiller described in Patent Document 1 has a structure in which the rear cover adjusting means is operated via a wire, it is necessary to adjust the position of the lock pin in accordance with the elongation and deformation of the wire. There was a problem. Further, the rotary tiller of Patent Document 1 has an advantage that the rear cover adjusting means can be operated from the traveling machine body, but when the alignment between the engagement hole formed in the suspension rod and the lock pin is necessary, On the contrary, the operability may be reduced.

The present invention was created to solve these problems in view of the above-described circumstances, and includes a main cover that covers the upper part of the rotary tillage portion, and a vertical rotation at the rear end portion of the main cover. A rear cover that is freely connected and covers the rear of the rotary tiller, a lock case that is rotatably supported on the main cover side, and a suspension rod that is connected to the rear cover and is slidably supported by the lock case A rotary tiller provided with a lock case that slidably supports the suspension rod, a free state that allows the rear cover to rotate up and down, a locked state that restricts the vertical rotation of the rear cover, and a rear cover that is raised Rear cover adjustment means that can be switched to a lower restricted state that restricts rotation in the downward direction while permitting rotation in the direction, and the rear cover adjustment means is switched to each state. And an operating means for operating example, the rear cover adjustment means is slidably disposed in the lock case, with disengaging the engagement hole formed in the suspending rod, the raising direction of rotation of the rear cover to the front end portion A lock pin having an inclined surface for allowing; and a lock pin spring for urging the lock pin in a direction away from the suspension rod. The operation means is slidably disposed on the lock case , and one end portion of the lock pin is a lock pin. An operation pin that regulates the position of the lock pin by abutting with the base end of the control pin, an operation pin spring that urges the operation pin in a direction approaching the lock pin, and the other end of the operation pin through the lever fulcrum while it is rotatably connected to the direction rotated has a selectively three cam surfaces that can contact with the end surface of the lock case, an operation record for switching the position of the operating pin by the selection operation of the cam surface The operation lever is configured to display the free state, the lock state, and the lowering restriction state by the position operation of the lock pin via the operation pin, and when the weight of the rear cover acts on the lock pin. In order to allow only the operation pin position to be changed while maintaining the lock pin position , the operation lever is brought to the lower restricted state when the operation position is directed upward, and the operation position is directed downward. In some cases, the free state appears, and the locked position appears when the operation position is in the middle of these, and the gravity center position of the operation lever at the operation position of the lowering restriction is determined from the lever fulcrum. When the lock pin is set to the lock pin side and the lock pin is pushed back in the lowering restricted state, a gap is created between the cam surface and the end surface of the lock case. The rotary tiller is configured to fall to the side and be held at the lower-restricted operation position .
In this way, it is possible to operate the rear cover adjusting means with an operating lever provided on the rod sliding support portion without using a wire, so there is no need to adjust the position of the lock pin in accordance with the elongation deformation of the wire. Thus, maintainability can be improved. In addition, since the rear cover adjusting means can be operated in the vicinity thereof, even when it is necessary to align the engagement hole formed in the suspension rod and the lock pin, it can be operated satisfactorily. In addition, the operation lever is not directly connected to the lock pin, but defines the position of the lock pin via the operation pin. When the weight of the rear cover acts on the lock pin, the position of the lock pin is maintained. However, since only the position of the operation pin can be changed, the operation load of the operation lever can be reduced, and the lock pin can be prevented from being worn or damaged.

  Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a rotary tiller. The rotary tiller 1 is connected to a rear portion of a traveling machine body (tractor) 2 through a lifting link mechanism 3 so as to be movable up and down, and is transmitted from the traveling machine body 2. Powered by the power to cultivate the field scene. That is, the rotary tiller 1 is configured with a rotary tiller 6 in which a number of tillers 5 are mounted on a rotary shaft 4 that rotates by receiving power from the traveling machine body 2.

  The rotary tiller 6 is covered with a cover body in order to prevent scattering of tilled soil. The cover body includes at least a main cover 7 that covers the upper side of the rotary tiller 6 and a rear cover 8 that is connected to the rear end of the main cover 7 so as to be vertically rotatable and covers the rear of the rotary tiller 6. It is. A suspension rod 9 is interposed between the main cover 7 and the rear cover 8. The suspension rod 9 is rotatably connected to one of the main cover 7 and the rear cover 8 and is slidably supported on the other. The outer periphery of the suspension rod 9 is applied to pressurize the rear cover 8. A pressure spring 10 is attached.

  In the present embodiment, the lower end portion of the suspension rod 9 is rotatably connected to the rear cover 8, and the upper end side of the suspension rod 9 is slidably supported by the rod sliding support portion 11 of the main cover 7. The rod sliding support portion 11 includes a main cover bracket 12 that protrudes upward from the rear end portion of the main cover 7 and an axial shape that is supported by the upper end portion of the main cover bracket 12 so as to be turnable from side to side. The suspension rod 9 is slidably supported in a rod through hole 13a formed in the lock case 13 in a radial direction.

  As shown in FIGS. 2 to 7, the lock case 13 includes a free state that allows the rear cover 8 to rotate up and down, a locked state that restricts the vertical rotation of the rear cover 8, and a rotation in the upward direction of the rear cover 8. The rear cover adjusting means 14 that can be switched to a lower restricted state that restricts rotation in the lowering direction while allowing the rotation, and the operating means 15 that switches the rear cover adjusting means 14 to each state are provided.

  The rear cover adjusting means 14 is slidably disposed in the lock case 13 and selectively engages / disengages with a plurality of engagement holes 9a formed in the suspension rod 9 and rotates the rear cover 8 in the upward direction at the tip. The lock pin 16 is provided with an inclined surface 16a for allowing the rotation, and a lock pin spring 17 that urges the lock pin 16 in a direction away from the suspension rod 9.

  The lock case 13 is provided with a pin arrangement hole 13b facing the axial direction, and the lock pin 16 is slidably arranged therein. A rotation restricting portion (not shown) that slides on the chamfered portion 16b of the lock pin 16 is formed in a part of the pin arrangement hole 13b, and the turn restricting portion restricts the rotation of the lock pin 16. As a result, the inclined surface 16a at the tip always faces downward. The lock pin spring 17 is a compression coil spring that is attached to the outer peripheral portion of the lock pin 16, and one end thereof is in contact with the stepped portion 13 c of the lock case 13, and the other end is formed at the base end of the lock pin 16. The lock pin 16 is urged in a direction away from the suspension rod 9 by contacting the flange portion 16c.

  The operation means 15 is slidably arranged in the pin arrangement hole 13b of the lock case 13, and an operation pin 18 that defines the position of the lock pin 16 by having one end abutting against the base end of the lock pin 16; An operation pin spring 19 for urging the operation pin 18 in a direction approaching the lock pin 16 is connected to the other end portion of the operation pin 18 via a lever fulcrum 20 and is selected as an end surface of the lock case 13. The operation lever 21 has three cam surfaces 21a to 21c that can contact each other and switches the position of the operation pin 18 by selecting the cam surfaces 21a to 21c.

  The operation pin spring 19 is a compression coil spring attached to the outer peripheral portion of the operation pin 18, one end abuts against a flange portion 18 a formed at one end of the operation pin 18, and the other end of the pin arrangement hole 13 b. By abutting against a retaining ring 22 fitted in the vicinity of the opening, the operation pin 18 is urged in a direction approaching the lock pin 16. Of the three cam surfaces 21 a to 21 c formed on the operation lever 21, the first cam surface 21 a is a surface that contacts the end surface of the lock case 13 at the first operation position where the operation lever 21 faces downward. The position of the lock pin 16 is a free position (a position where the lock pin 16 is detached from the engagement hole 9a). The second cam surface 21b is a surface that comes into contact with the end surface of the lock case 13 at the second operation position where the operation lever 21 faces sideways. (Position to enter into the joint hole 9a). The third cam surface 21c is a surface that comes into contact with the end surface of the lock case 13 at the third operation position where the operation lever 21 faces upward. The position of the lock pin 16 is engaged with the lowering restriction position (the inclined surface 16a is engaged). The position straddling the inside and outside of the hole 9a).

  According to the operation lever 21 configured as described above, it is possible to operate the rear cover adjusting means 14 without using a wire, so that it is not necessary to adjust the position of the lock pin 16 according to the elongation deformation of the wire. Thus, maintainability can be improved. Further, since the operation lever 21 can operate the rear cover adjusting means 14 in the vicinity thereof, the operation lever 21 is good even when the alignment between the engagement hole 9a formed in the suspension rod 9 and the lock pin 16 is necessary. Can be operated.

  In addition, the operation lever 21 is not directly connected to the lock pin 16 but defines the position of the lock pin 16 via the operation pin 18, and when the weight of the rear cover 8 acts on the lock pin 16, Only the position of the operation pin 18 can be changed while maintaining the position of the lock pin 16. For example, as shown in FIG. 6, when the weight of the rear cover 8 acts on the lock pin 16 when the operation lever 21 is operated from the third operation position (lowering restriction position) to the first operation position (free position). The operation of changing only the position of the operation pin 18 to the free position is possible while maintaining the position of the lock pin 16 at the lower restriction position. Thereby, the operation load of the operation lever 21 can be reduced, and the wear and damage of the lock pin 16 can be prevented. In the above case, when a lifting load is applied to the rear cover 8, the lock pin 16 automatically disengages from the engagement hole 9a and shifts to the free state.

  Next, the operation of the rear cover adjusting means 14 and the operating means 15 will be described with reference to FIGS.

  FIG. 2 shows a state in which the operation lever 21 is operated to the first operation position. In this state, the operation pin 18 moves to the right position, and the lock pin 16 also moves to the right position following this. The lock pin 16 is completely detached from the engagement hole 9a of the suspension rod 9, and the rear cover 8 is in a free state.

  FIG. 3 shows a state in which the operation lever 21 is operated to the third operation position. In this state, the operation pin 18 moves to the intermediate position, and the lock pin 16 also moves to the intermediate position following this. The inclined surface 16a of the lock pin 16 straddles the inside and outside of the engagement hole 9a, and the rear cover 8 is in a lowered restriction state.

  FIG. 4 shows a state in which the rear cover 8 is rotated upward in the state of FIG. 3. In this state, the suspension rod 9 moving upward pushes the lock pin 16 back through the inclined surface 16a, The upper rotation of the rear cover 8 is allowed.

  FIG. 5 shows a state where the rear cover 8 is further rotated upward in the state of FIG. 4 and the lock pin 16 is engaged with the next engagement hole 9a. In this state, the state is the same as the state shown in FIG. In addition, the rear cover 8 is in a lowering restricted state.

  FIG. 6 shows a state in which the operation lever 21 is operated to the first operation position in the state of FIG. 5. In this state, the weight of the rear cover 8 acts on the lock pin 16. Due to the sliding resistance, the lock pin 16 maintains the current position, and only the operation pin 18 moves to the right position. Thereafter, when the rear cover 8 is lifted, the lock pin 16 is automatically detached from the engagement hole 9a and shifts to a free state.

  FIG. 7 shows a state in which the operation lever 21 is operated to the second operation position. In this state, the operation pin 18 moves to the left position, and the lock pin 16 also moves to the left position following this. The lock pin 16 is completely engaged with the engagement hole 9a, and the rear cover 8 is locked.

  Furthermore, the rotary tiller 1 of the present embodiment includes means for solving the problem that when the lock pin 16 is pushed back in the lowering restricted state, the operation lever 21 moves to another operation position without permission. . Specifically, the lower restriction state appears at the third operation position where the operation lever 21 faces upward, and the center of gravity of the operation lever 21 at the operation position is set closer to the lock case 13 than the lever fulcrum 20. In this manner, as shown in FIG. 4, even if the lock pin 16 is pushed back in the lowered restricted state and a gap is generated between the end surface of the lock case 13 and the third cam surface 21c, the operation lever 21 is locked. It falls to the case 13 side and the posture is held by the lock case 13. Thereby, when the lock pin 16 is pushed back in the lowering restricted state, it is possible to solve the problem that the operation lever 21 is arbitrarily moved to another operation position.

  According to the present embodiment configured as described, the main cover 7 covering the upper side of the rotary tiller 6 and the rear end of the main cover 7 are connected to the rear end of the main cover 7 so as to be rotatable up and down. In the rotary tiller 1 having a rear cover 8 to be covered and a suspension rod 9 that is connected to the rear cover 8 and is slidably supported by the main cover 7, a lock case 13 that slidably supports the suspension rod 9. And a free state in which the rear cover 8 is allowed to rotate up and down, a locked state in which the rear cover 8 is prevented from rotating up and down, and a lower cover that is allowed to rotate in the up direction while restricting rotation in the down direction. The rear cover adjusting means 14 that can be switched to the lowering restricted state, and the operating means 15 that switches the rear cover adjusting means 14 to each state are provided. A lock pin that is slidably disposed on the slide 13 and engages / disengages in an engagement hole 9a formed in the suspension rod 9 and includes an inclined surface 16a at the tip portion for allowing the rear cover 8 to rotate in the upward direction. 16 and a lock pin spring 17 that urges the lock pin 16 in a direction away from the suspension rod 9, and the operating means 15 is slidably disposed on the lock case 13, and one end portion is a base of the lock pin 16. An operation pin 18 that defines the position of the lock pin 16 by coming into contact with the end portion, an operation pin spring 19 that urges the operation pin 18 in a direction approaching the lock pin 16, and a rotation to the other end portion of the operation pin 18. There are three cam surfaces 21a to 21c that are movably connected and can selectively contact the end surface of the lock case 13, and the position of the operation pin 18 is selected by selecting the cam surfaces 21a to 21c. An operation lever 21 for switching, and the operation lever 21 causes the free state, the lock state, and the lowering restriction state to be revealed by the position operation of the lock pin 16 via the operation pin 18, so that the rear cover adjusting means is provided via a wire. As in the case of operating 14, it is not necessary to adjust the position of the lock pin 16 according to the elongation deformation of the wire, and the maintainability can be improved. Further, since the rear cover adjusting means 14 can be operated in the vicinity thereof, even if it is necessary to align the engagement hole 9a formed in the suspension rod 9 and the lock pin 16, it can be operated satisfactorily. it can.

  In addition, the operation lever 21 is not directly connected to the lock pin 16 but defines the position of the lock pin 16 via the operation pin 18, and when the weight of the rear cover 8 acts on the lock pin 16, Since only the position of the operation pin 18 can be changed while maintaining the position of the lock pin 16, the operation load of the operation lever 21 can be reduced, and wear and breakage of the lock pin 16 can be prevented.

Further, in the present embodiment, the lowering restriction state appears at the third operation position where the operation lever 21 faces upward, and the center of gravity of the operation lever 21 at the operation position is set closer to the lock case 13 than the lever fulcrum 20. Therefore, even if the lock pin 16 is pushed back in the lowering restricted state and a gap is generated between the end surface of the lock case 13 and the third cam surface 21c, the operation lever 21 falls to the lock case 13 side, and the lock case 13 Posture is maintained. Thereby, when the lock pin 16 is pushed back in the lowering restricted state, it is possible to solve the problem that the operation lever 21 is arbitrarily moved to another operation position.

It is a side view of a rotary tillage device. (A) is sectional drawing of the rear cover adjustment means and operation means which show a free state, (B) is a side view. It is sectional drawing of the rear cover adjustment means and operation means which show a lowering regulation state. It is sectional drawing of a rear-cover adjustment means and an operation means which show the state which rotated the rear cover upwards in the fall control state. It is sectional drawing of the rear-cover adjustment means and operation means which show the state which returned to the lowering regulation state again. It is sectional drawing of the rear cover adjustment means and operation means which show the state which operated the operation lever to the 1st operation position (free position) in the fall control state. It is sectional drawing of the rear cover adjustment means and operation means which show a locked state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary tilling device 6 Rotary tilling part 7 Main cover 8 Rear cover 9 Hanging rod 9a Engagement hole 11 Rod sliding support part 14 Rear cover adjustment means 15 Operation means 16 Lock pin 16a Inclined surface 17 Lock pin spring 18 Operation pin 19 Operation pin spring 21 Operation lever 21a-21c Cam surface

Claims (1)

A main cover that covers the top of the rotary tillage unit;
A rear cover that is connected to the rear end of the main cover so as to be vertically rotatable and covers the rear of the rotary tillage unit;
A lock case rotatably supported on the main cover side;
A rotary tiller device comprising a suspension rod coupled to the rear cover and slidably supported by the lock case .
It is arranged in a lock case that slidably supports the suspension rod, and allows the rear cover to rotate up and down, allows the rear cover to rotate up and down, and locks the rear cover up and down, and allows the rear cover to rotate up. A rear cover adjusting means switchable to a lower restricted state for restricting rotation in the lowering direction,
Operating means for switching the rear cover adjusting means to each state;
The rear cover adjustment means
A lock pin that is slidably disposed on the lock case , engages / disengages in an engagement hole formed in the suspension rod, and includes a tilted surface for allowing the rear cover to rotate in the raising direction;
A lock pin spring that urges the lock pin in a direction away from the suspension rod;
The operation means is
An operation pin that is slidably arranged on the lock case and that defines the position of the lock pin by having one end abutting against the base end of the lock pin;
An operation pin spring for urging the operation pin in a direction approaching the lock pin;
It is connected to the other end of the operation pin through a lever fulcrum so as to be pivotable in the vertical direction , and has three cam surfaces that can be selectively brought into contact with the end surface of the lock case. An operation lever for switching the position of the operation pin,
The operation lever causes the free state, the locked state, and the lowering restriction state to be revealed by the position operation of the lock pin via the operation pin, and when the weight of the rear cover acts on the lock pin, the position of the lock pin per in the only position of the operation pin modifiable operations while maintaining,
When the operation lever is set to the operation position facing upward, the lowering restriction state appears, and when it is set to the operation position facing downward, the free state appears, and the operation position is directed to the side which is the middle of these. Sometimes a lock state will appear,
By setting the position of the center of gravity of the operating lever at the operation position of the lowering restriction to the lock pin side with respect to the lever fulcrum, the lock pin is pushed back in the lowering restriction state, so that there is a gap between the cam surface and the end face of the lock case. The rotary tiller is configured so that the operation lever is tilted to the lock case side and is held in the lower-restricted operation position when the occurrence of the occurrence of the problem occurs.

Images