JP3662657B2 - Rotary tillage machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rear cover locking device of a rotary tiller working machine of a work vehicle.
[0002]
[Prior art]
Conventionally, a rear cover that is attached to a rear portion of a rotary cover of a working machine such as a rotary tiller so as to be pivotable up and down is well known. Among them, a rear cover having a front and rear structure is also disclosed in Japanese Utility Model Publication No. 6-049125, etc. Is disclosed.
As such a rear cover having a front and rear divided structure, an elastic member is used as a front part in order to be applied to leveling work.
[0003]
The rear cover suspending means has a structure in which rod receivers are provided at substantially symmetrical positions on the upper surface of the rotary cover, and the rods are connected between the rod receivers and the rear cover. The rod is slidable with respect to the rod receiver, and the rear cover can be rotated according to the unevenness of the field.
An example is also disclosed in Japanese Utility Model Publication No. 6-049125.
In addition, when replacing claws or removing soil, the rear cover is fixed in the raised position with a lock device. This lock device has conventionally been hooked at a single position at either the left or right position. The structure or the switching operation of locking / releasing was by replacing the pins.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a reliable locking structure of a rear cover during work.
The above conventional lock device having a hook latch structure has no problem when driving is stopped and no vibration or load is applied for claw replacement or claw dropping.
However, in the cultivation work, there is a case where it is desired to work with the rear cover raised in order to quickly dry the soil block generated by the cultivation.
If it is placed at one position on either the left or right side, the amount of left and right swinging is large, so the lock device of this structure is easy to come off, and the rear cover is fixed in the raised position during such tillage work. It is impossible.
[0005]
In particular, in the case of a rear cover having a front and rear divided structure as described above, and the front portion is made of an elastic material, if the lock position is close to the hinge portion for mounting the rear cover on the rotary cover, this portion is made of an elastic material. However, since the amount of rocking associated with the deformation is large, there is a problem that the hook is easily detached.
[0006]
On the other hand, in the case of pin fixing as shown in Japanese Utility Model No. 6-049125, it is necessary to hold the rear cover in an appropriate position for the pin hole alignment. However, since the rear cover is heavy, it can be easily done by one person. It was not a thing. Even if pin fixing is replaced with bolt fixing, the same problem occurs.
[0007]
[Means for Solving the Problems]
The present invention uses the following means in order to solve the above-mentioned problems related to the rotary tiller.
A rear cover 1 pivotally supported at the rear end of the rotary cover 6, wherein the front portion of the rear cover 1 is a front rear cover 2 made of an elastic material, and the rear portion is a rear portion made of a rigid material such as metal. The rear cover 4 is provided with a pivot shaft 3 pivotally supported on the rear end of the rotary cover 6 at the front end of the front rear cover 2, and the rear rear cover 4 is grounded by the slack of the front rear cover 2 which is an elastic material. In the structure of performing the flat work, a rod receiver 7 protrudes from the upper surface of the rotary cover 6, and a rod bracket 5 protrudes from the upper portion of the rear rear cover 4 at a position behind the rod receiver 7. 7 is provided with a pivotable pivot shaft 8 at the front end thereof, and a suspension rod 9 is slidably fitted into the pivot shaft 8 so that the rear end of the suspension rod 9 is a rod of the rear rear cover 4. Pivot on pivot pin of bracket 5 The pivot pin for pivotally supporting the suspension rod 9 is a lock pin 9 a, and the base end of the lock hook 10 is pivotally supported on the pivot shaft 8 at the tip of the rod receiver 7. A hook groove 10a that fits into the lock pin 9a is formed at the distal end portion, and a lock lever 12 and a lock lever guide 11 that can be turned up and down are provided on the rod receiver 7, and the lock lever 12 is a lock lever guide. 11, the lock lever 12 and the lock hook 10 are connected to each other with a spring 13 interposed therebetween. The spring 13 is a fulcrum during the rotation of the lock lever 12. The lock hook 10 rotated beyond the lock lever 12 is held so as to hold the lock and release positions .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view of a rotary working machine having a hook structure rear cover locking device when unlocked,
FIG. 2 is also a side view at the time of locking.
[0009]
FIG. 3 is a plan view of the rear cover showing the arrangement position of the rear cover lock device.
FIG. 4 is a side view of the rotary working machine provided with the rear cover suspension cylinder in a state where the rear cover is in the lowest lowered position.
[0010]
FIG. 5 is a side view of the rear cover in the middle raised position,
FIG. 6 is a side view in the state where it is also in the highest position,
FIG. 7 is an internal plan view of a drive case provided with a bevel gear noise reduction member,
FIG. 8 is an internal side view, and FIG. 9 is an internal front view.
[0011]
First, the configuration of the rear cover lock device in the rotary tiller shown in FIGS. 1 to 3 will be described.
A rotary cover 6 covers an upper portion of the rotary shaft 14 that projects the rotary claws 15 radially, and a hinge is provided at the rear end of the rotary cover 6 so that the rotary shaft at the front end of the rear cover 1 can be turned up and down. It is pivotally supported.
[0012]
The rear cover 1 of this embodiment is of a type suitable for leveling work, the front portion is a front rear cover 2 made of an elastic material such as rubber or synthetic resin, and the front end is pivoted to the rear end of the rotary cover 6. The rotating shaft portion 3 is supported.
And the latter half part which touches directly to the field surface is the rear part rear cover 4 which consists of rigid materials, such as metal. Due to the looseness of the front rear cover 2 which is an elastic material, the rear rear cover 4 contacts the surface of the field in a state of being almost horizontal, which is suitable for leveling work.
[0013]
Rod brackets 5 and 5 are projected from the upper part of the rear rear cover 4 at symmetrical positions as shown in FIG. On the other hand, on the upper surface of the rotary cover 6, rod receivers 7, 7 project from the front positions of the rod brackets 5, 5 (that is, at the symmetrical positions).
At the tip of each rod receiver 7, a rotatable rotation shaft 8 is laterally provided, and a fitting insertion hole is penetrated in a radial direction through the rotation shaft 8, and is slidable in the fitting insertion hole. A suspension rod 9 is fitted and the rear end of the suspension rod 9 is pivotally supported by the rod bracket 5 of the rear cover 1 to serve as a suspension means for the rear cover 1. The pivot pin that pivotally supports the suspension rod 9 on the rod bracket 5 protrudes laterally to form a lock pin 9a.
[0014]
The rear cover 1 has a front end pivoted to the rear end of the rotary cover 6 and, at the same time, the suspension rod 9 is slidable with respect to the rotation shaft 8 of the rod receiver 9. As shown in FIG. 1, when the rear cover 1 is in the lowered position, it can be turned up and down according to the unevenness of the field surface. When the rear cover 1 is lowered deeply, the rotary shaft 8 is pressed against a stopper 9b that is spring-biased and freely fitted around the upper end of the suspension rod 9, and the lower limit position is reached.
[0015]
The rear cover locking device in the present embodiment has a hook retaining structure.
First, the base end of the locking hook 10 is pivotally supported on the pivot shaft 8 at the distal end of the rod receiver 7, and the distal end side extends upward and rearward from the distal end of the rod receiver 7. Forms a hook groove 10a. Further, a spring mounting member 10b projects from the proximal end of the locking hook 10 to the front.
A lock lever guide 11 is disposed at an upper and lower intermediate position of the rod receiver 7, and the base end of the lock lever 12 is pivotally supported at the lower position. The lock lever 12 is inserted into a guide groove provided in the lock lever guide 11 so that it can be turned up and down.
Further, a spring 13 is connected between the lock lever 12 and the spring mounting member 10b.
[0016]
The operation of such a locking device structure will be described.
First, as shown in FIG. 2, when the lock lever 12 is set at the lock position B at the upper end of the guide groove of the lock lever guide 11, the spring mounting member 10 b is pulled forward via the spring 13. The locking hook 10 is urged to the rotation lower end position and stopped.
In this state, when the rear cover 1 is lifted, the suspension rod 9 slides forward through the insertion hole of the rotating shaft 8 (the inclination angle of the suspension rod 9 varies with the sliding, The rotation shaft 8 rotates and follows this.) The lock pin 9a of the suspension rod 9 is fitted into the hook groove 10a of the lock hook 10, and the rear cover 1 is locked at the raised position.
[0017]
Next, when releasing the lock, as shown in FIG. 1, when the lock lever 12 is rotated downward and set at the release position A at the lower end of the guide groove of the lock lever guide 11, the lock lever 12 is being rotated. When the spring 13 exceeds the fulcrum and the lock lever 12 is set to the A position, the spring mounting member 10b is pulled backward via the spring 13, but the hook 10 does not rotate and the rear cover 1 does not descend. When the rear cover 1 is lifted up slightly, the locking hook 10 is rotated forward (upward), and is urged to the rotation upper end position by the urging force of the spring 13 and stopped.
That is, since the lock hook 10 is rotated upward, the lock pin 9a is removed from the hook groove 10a, the rear cover 1 is lowered by its own weight, and the suspension rod 7 is also slid downward and the rear cover 1 1 reaches the lowered position shown in FIG. 1 and is in an unlocked state, so that the rear cover 1 is rotatable with respect to the lock cover 6 as described above.
[0018]
As shown in FIG. 3, the suspension means including the lock receiver 7 and the suspension rod 9 are disposed at symmetrical positions of the lock cover 6, and the suspension rod 9 and the suspension rod 9 are arranged along the respective suspension means. A rear cover lock device including a lock hook 10 and the like is provided. Therefore, the rear cover lock device is disposed at the left / right symmetrical position of the rotary tiller and the amount of left / right swinging at the disposed position is small.
Further, the lock position, that is, the position of the lock pin 9a of the suspension rod 9 and the position of the hook groove 10a of the lock hook 10 are pivoted to the rotary cover 6 rear end hinge portion of the rotary shaft portion 3 at the front end of the rear cover 1. Since the rod bracket 5 part attached to the rear rear cover 4 is located far behind the support position and the lock pin 9a is disposed, there is no influence of front / rear swing due to deformation of the front rear cover 2 which is an elastic material. .
From the above, even if the tilling operation is performed with the rear cover 1 in the raised position and locked as shown in FIG. 2, there is no influence of left / right or forward / backward swing due to unevenness of the field or tilling load, and the lock pin 9a It does not come off from the hook groove 10a.
[0019]
Next, an embodiment of the rotary tiller shown in FIGS. 4 to 7 will be described.
The same reference numerals as those in the embodiment shown in FIGS. 1 to 3 denote the same members.
The rotary tiller according to the present embodiment replaces the suspension rods 9 and 9 in the suspension means shown in FIGS. 1 to 3 with the rear cover suspension cylinders 16 and 16 without providing a rear cover lock device separately from the suspension means. It is a thing.
The rear cover suspension cylinder 16 is a hydraulically driven or electrically driven cylinder, and is pivotally supported by the rod receiver 7 so as to be pivotable back and forth. The tip of the piston rod 16a is pivotally supported by the rod bracket 5 of the rear cover 1. doing.
The expansion / contraction length of the piston rod 16a can be set at an arbitrary position from the operating portion of the tractor, for example, the lowest lowered position shown in FIG. 4, the raised intermediate position shown in FIG. 5, and the highest raised position shown in FIG. Further, the degree of freedom of sliding of the piston rod 16a is set to some extent in the contraction direction from the set expansion / contraction length.
[0020]
As a result, the rear cover 1 can be set to an arbitrary height while having a certain amount of degree of freedom of rotation only upward, so that the work of manually raising the rear cover 1 is not necessary, and during the tillage work In addition, the rear cover 1 can be moved up and down.
And the situation where the lock | rock is removed by vibration during tillage and the rear cover 1 falls does not arise.
[0021]
Therefore, as shown in FIG. 6, the rear cover 1 is set to the raised position, and the rotary tiller is stopped to perform soil removal or claw replacement work, or to quickly dry the soil mass generated by tillage. As well as being able to perform the tilling work as it is, it can be set at an arbitrary position as shown in FIG.
[0022]
Next, the bevel gear noise reduction structure in the drive case of the rotary tiller will be described with reference to FIGS.
The front end and the rear end of the input part of the drive case 17 are open, and a front cover 24 is attached to the front end opening 17a, and a rear cover 25 is attached to the rear end opening 17b. An input shaft 18 for connecting to the PTO shaft of the tractor is projected forward from the front cover 24, and an input side bevel gear is provided at the rear end of the input shaft 18 in the drive case 17. 18a is formed. The input side bevel gear 18a meshes with an output side bevel gear 19a, which is fixed to the sprocket shaft 19 that is pivotally supported in the left-right direction in the drive case 17, in the orthogonal direction.
A sprocket 19 b is attached to the center of the sprocket shaft 19, and a chain 20 is wound around an output-side sprocket that is directly connected to the rotary shaft 15 that is pivotally supported by the drive case 17.
[0023]
The bevel gear noise reduction structure according to the present embodiment presses the end face of the output side bevel gear 19a opposite to the meshing portion so as to eliminate play in the meshing portions of the bevel gears 18a and 19a.
That is, a roller shaft pin 21 is fixed inside the rear cover 25, and a spring 22 or a rigid resin roller 22 is externally fitted to the roller shaft pin 21 so as to be rotatable. The roller 22 forms a flange portion 22a at the tip and a cylindrical spring exterior portion 22b, and a portion of the flange portion 22a at the tip is pressed against the end face of the output side bevel gear 19a.
In order to apply this pressing force, a spring 23 is wound around the spring exterior portion 22b. The spring 23 is a compression spring and has an urging force in the extending direction. Therefore, the flange portion 22a is pushed toward the pressing portion side with the output side bevel gear 19a, and the pressing force is exerted on the output side bevel gear 19a.
[0024]
Since the roller 22 is rotatable, the roller 22 rotates following the rotation of the output side bevel gear 19a, and friction is hardly generated between the roller 22 and the output side bevel gear 19a. Therefore, the progress of wear is slow. Even when worn, the roller 22 which is an elastic material by the force pushing the collar portion 22a of the spring 23 extends the spring exterior portion 22b by the amount of wear of the collar portion 22a, so that the collar portion 22a and the output side bevel gear 19a The pressing force during is not changed. With such a structure, it is possible to maintain a state in which the play between the bevel gears 18a and 19a is eliminated over a long period of time, and thus low noise can be maintained for a long time.
[0025]
【The invention's effect】
Since this invention comprised the rotary tillage working machine as mentioned above, there exist the following effects.
Even if the front cover is made of an elastic material, the rear cover has a locking position behind the center of the rear cover, so that it is not affected by rocking caused by deformation of the elastic material in the front half. The locked state can be maintained even during tillage, and the rear cover is fixed at the raised position as well as the claw replacement work and soil removal work by stopping the drive of the rotary tiller and fixing the rear cover at the raised position. Tilling work can be performed as it is, and it is also possible to quickly dry the soil mass generated by tillage.
In addition, it is possible to easily lock or release the rear cover with one touch by switching the lock lever without inserting or removing bolts or pins, thereby reducing the burden on the operator.
[Brief description of the drawings]
FIG. 1 is a side view of a rotary working machine having a hook structure rear cover locking device when unlocked.
FIG. 2 is a side view of the locked state.
FIG. 3 is a plan view of the rear cover showing an arrangement position of the rear cover locking device.
FIG. 4 is a side view of the rotary working machine provided with the rear cover suspension cylinder in a state where the rear cover is in the lowest lowered position.
FIG. 5 is a side view of the rear cover in a state where the rear cover is in an intermediately raised position.
FIG. 6 is a side view in the same state where it is at its highest position.
FIG. 7 is an internal plan view of a drive case provided with a bevel gear noise reduction member.
FIG. 8 is an internal side view of the same.
FIG. 9 is an internal front view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rear cover 2 Front rear cover 3 Rotating shaft part 4 Rear rear cover 5 Rod bracket 6 Rotary cover 7 Rod receiver 8 Rotating shaft 9 Suspension rod 9a Lock pin 10 Locking hook 10a Hook groove 10b Spring mounting member 11 Lock lever guide 12 Lock lever 13 Spring 16 Rear cover suspension cylinder 17 Drive case 18 Input shaft 18a Input side bevel gear 19 Sprocket shaft 19a Output side bevel gear 21 Roller pin 22 Roller 22a Collar 22b Spring exterior 23 Spring 25 Rear cover A Unlock position B Lock position

Claims (1)

A rear cover 1 pivotally supported at the rear end of a rotary cover 6, wherein the front portion of the rear cover 1 is a front rear cover 2 made of an elastic material, and the rear portion is made of a rigid material such as a metal. The rear cover 4 is provided with a pivot shaft 3 pivotally supported on the rear end of the rotary cover 6 at the front end of the front rear cover 2, and the rear rear cover 4 is grounded by the slack of the front rear cover 2 which is an elastic material. In the configuration to do flat work,
A rod receiver 7 protrudes from the upper surface of the rotary cover 6, and a rod bracket 5 protrudes from the rear rear cover 4 at a position behind the rod receiver 7,
A pivotable pivot shaft 8 is provided at the front end of the rod receiver 7, a suspension rod 9 is slidably fitted on the pivot shaft 8, and the rear end of the suspension rod 9 is a rear rear cover. 4 is pivotally supported on the pivot pin of the rod bracket 5, and the pivot pin that pivotally supports the suspension rod 9 is a lock pin 9 a,
The pivot shaft 8 at the distal end of the rod receiver 7 pivotally supports the proximal end of the lock hook 10, and the hook groove 10 a that fits into the lock pin 9 a is formed at the distal end portion of the lock hook 10.
Separately, the rod receiver 7 is provided with a lock lever 12 and a lock lever guide 11 that can be turned up and down. The lock lever 12 is inserted into a guide groove provided in the lock lever guide 11,
The lock lever 12 and the lock hook 10 are connected with a spring 13 interposed therebetween, and the spring 13 passes over a fulcrum during the rotation of the lock lever 12 and is operated by the operation of the lock lever 12. A rotary tilling work machine configured to hold the locked and unlocked positions of the rotated locking hook 10 .

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