JP2000041433A - Structure of planting case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a planting case less expensive and lighter than usual ones without reducing necessary functions by reviewing functions and structures in newly designing the planting case. SOLUTION: A mold cost is saved by integrally constituting a planting case 13 having a cylindrical input shaft 28 receiving the power of an output shaft 26 of a feed case, an output shaft 29 transmitting the power to a planting mechanism and a chain interlocking mechanism 31 by integrally connecting a left half case 13L and a right half case 13R symmetrical to a line B connecting the input shaft 28 and the output shaft 29 and bringing shapes of the left half case 13L and the right half case R formed by a mold to be common to save a mold cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planting case structure used for a planting device such as a rice transplanter, and more particularly, to eliminate waste of a relatively large number of planting cases, reduce costs and reduce weight. Related to the technology to achieve.

[0002]

2. Description of the Related Art A planting case is disclosed in Japanese Utility Model Application Laid-Open No.
And a chain mechanism for transmitting power from a feed case to a rotating case, as shown in Japanese Patent Application Laid-Open No. 5-344806, and three in the case of six-row planting and three in the case of eight-row planting. A relatively large number such as four are used.

[0003]

SUMMARY OF THE INVENTION Conventional planting cases are:
By adopting a split case structure using two left and right split molded products, it was equipped with sufficient support strength and a good sealing function of the chain mechanism. Since it is necessary and involves a lot of machining, there seems to be room for cost reduction and weight reduction. An object of the present invention is to make the planting case more inexpensive and lighter than in the past without lowering the necessary functions by reviewing the functions and structure when newly designing the planting case.

[0004]

According to a first aspect of the present invention, in a planting case structure, an input shaft receiving power from a feed case, an output shaft transmitting power to a planting mechanism, and these two shafts are interlocked. A planting case with a rotating transmission mechanism is constructed by connecting and integrating the left and right split cases that are symmetrical about the line connecting the input shaft and the output shaft, and the shape of the left and right split cases is formed by molding. It is characterized by being shared.

According to a second aspect of the present invention, in a planting case structure, a chain interlocking mechanism including an input shaft receiving power from a feed case and an output shaft transmitting power to the planting mechanism is provided inside the planting case. In addition, the supporting portion of the tension mechanism for tensioning the chain interlocking mechanism is formed integrally with the planting case.

According to a third aspect of the present invention, in the planting case structure, an input shaft for receiving power from a feed case, an output shaft for transmitting power to the planting mechanism, and a transmission mechanism for rotating these two shafts in an interlocking manner. And the input shaft is configured as a cylindrical shaft into which the output shaft of the feed case is internally fitted while being integrally rotated, and the input shaft is held near a regular position where the output shaft of the feed case is internally fitted therein. Holder part for
It is characterized by being integrally formed with the planting case.

According to a fourth aspect of the present invention, in the planting case structure, an input shaft for receiving power from a feed case, an output shaft for transmitting power to a rotating case for planting, and a transmission mechanism for interlocking rotation of both shafts are provided. Equipped with an attached case, a cylindrical boss that engages with the sun gear of the rotating case so that it cannot rotate relative to the output shaft while being fitted to the output shaft so as to be relatively rotatable, with an insert member that is integrated when the planting case is molded by the mold. It is characterized by comprising.

[Operation] In the above-mentioned publication,
Although the input shaft portion and the output shaft portion in the planting case are asymmetrical in the left and right directions, in the former publication described above,
Only the input shaft portion has an asymmetric shape. Therefore, if the input shaft portions of the left and right split cases are adjusted to the side where a complicated shape is required, there is a possibility that the same machined part can be obtained even if the subsequent machining is different. is there.

Based on this idea, the configuration of claim 1 is to form the left and right split cases symmetrical with respect to the line connecting the input shaft and the output shaft, thereby forming the left and right split cases. Is a common shape. In the past, two sets of dies were required for each of the left and right split cases, but now only one set is required. This can reduce the cost of high dies and reduce the unit cost of products. become.

According to the second aspect of the present invention, since the supporting portion of the tension mechanism for tensioning the chain interlocking mechanism housed in the planting case is formed integrally with the planting case.
As compared with the structure disclosed in Japanese Utility Model Application Laid-Open No. 56-155151, in which the support pin of the chain tie toner is inserted and supported across the left and right split cases, the support pin and the left and right split case pins are inserted. The machining of the hole can be omitted, and the cost can be reduced accordingly.

According to the third aspect of the invention, the following operation is provided. When the input shaft is configured as a cylindrical shaft that internally fits the output shaft of the feed case in an integrally rotating state, to assemble the cylindrical case surrounding the output shaft of the feed case and the planting case,
First, insert the feed case output shaft into the planting case input shaft with the left and right split cases bolted together with parts such as the chain interlocking mechanism and the ridge-side clutch in the planting case. It becomes the procedure of bolting.

However, the aforementioned Japanese Utility Model Application Laid-Open No. 63-5852.
In the structure disclosed in Japanese Patent Application Laid-Open No. 6-64, the position of the input shaft on which the drive sprocket is formed is determined only when the feed case output shaft is inserted therein. Therefore, when the feed case output shaft is not inserted, the input shaft is easily displaced in the planting case. It is necessary to perform a positioning operation for matching the position of the shaft with the axis of the hole formed in the case, and it often takes time to assemble the two cases.

Therefore, in the structure of the present invention, since the holder portion for holding the input shaft near the normal position where the output shaft of the feed case is internally fitted is integrally formed with the planting case, the input shaft is formed. It is held in the planting case without detaching, and since the feed case output shaft is simply inserted into the input shaft without fail, the two cases can be assembled easily and quickly.

When the rotating case is driven by the output shaft of the planting case as disclosed in Japanese Utility Model Laid-Open Publication No. 63-58526, the output shaft revolves around the rotating case itself and the sun gear (reference numeral 14). Since it is necessary to fix the holder so that it does not rotate, a holder (reference numeral 13) having a boss that engages with the sun gear is fixed to the planting case by bolts.

According to a fourth aspect of the present invention, a cylindrical boss which is non-rotatably engaged with a sun gear of a rotating case for planting while being externally fitted to the output shaft so as to be rotatable relative to the output shaft is provided by a mold-type planting case. Since it is composed of an insert member that is integrated at the time of molding, a special holder as in the past is not required, and its mounting means and its processing are also unnecessary,
Cost reduction and weight reduction are possible.

[Effect] In the planting case structure according to the first aspect, the cost can be reduced without deteriorating the function by sharing the mold of the left and right split cases.

In the planting case structure according to the second aspect, since the supporting portion of the tension mechanism of the chain interlocking mechanism is integrally formed with the planting case, it is possible to reduce the number of dedicated parts conventionally required and reduce the cost. Now you can.

In the planting case structure according to the third aspect, the output shaft and the planting case input shaft can be fitted by simply inserting the output shaft of the feed case into the planting case. There is an advantage that the assembling work between the plant and the planting case can be performed easily and quickly, and the cost can be reduced by shortening the assembling time.

In the planting case structure according to the fourth aspect, since the fixing of the cylindrical boss required for connection with the rotating case can be integrally formed at the time of molding the planting case, cost reduction and weight reduction can be achieved. It has been made reasonable.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a light four-row rice transplanter, 1 is a traveling body, 2 is a front steering wheel, 3 is a driving rear wheel,
Is a control unit, 5 is an engine, 6 is a belt transmission mechanism, 7 is a transmission case, 8 is a rear transmission case, 9 is a PTO transmission shaft, A is a planting section, 10 is a lifting link mechanism for raising and lowering the planting section, 11 is a seedling mounting table, 12 is a feed case to which the power of the PTO transmission shaft 9 is input, 13 is a planting case, a is a rotating case 14 and a planting mechanism comprising a pair of planting arms 15, 15, and 16 is a planting mechanism. Leveling float.

The planting section A and its transmission system will be described. As shown in FIG. 2, a single feed case 12,
The planting cases 13, 13 arranged on the left and right of the output case 26 are output shafts 26 projecting left and right from the lower end of the feed case 12.
Are connected and integrated via left and right cylindrical cases 17, 17, and auxiliary frames 32 are bolted to the left and right of the planting case 13, and this series of structures serves as a frame as a planting portion A. Is composed. The right and left cylinder cases 17 are shorter in length than the left cylinder case 17 because the left and right centers of the feed case 12 are offset to the left of the left and right centers of the body.

The feed case 12 is provided with a drive arm 20 for driving a vertical feed mechanism 19 of the seedling mounting table 11 at each of the right and left ends, and the seedling mounting table 11 is reciprocated and laterally fed. Feed shaft 22 having a spiral groove formed therein, and an output shaft 26 for outputting to the planting case 12. The left and right cylindrical cases 17, 17 are pipes 17a, 17
The thick flanges 17b, 17b are welded to the left and right ends of the a, respectively, and are bolted to the side surface of the feed case 12 and the side surface of the planting case 13, respectively.

As shown in FIGS. 3 and 4, the planting case 13
Is a left-right split structure in which a left split case 13L and a right split case 13R are connected by bolts.
A chain interlocking mechanism formed by winding a chain 30 over a drive sprocket 28a of a cylindrical input shaft 28 into which the inner shaft 6 is fitted and a driven sprocket 29a of an output shaft 29 for transmitting power to the planting mechanism a. 31 are installed.

The left split case 13L and the right split case 13R correspond to a center line B connecting the input shaft 28 and the output shaft 29.
Is symmetrical in appearance, and more specifically, a so-called point-symmetrical product rotated 180 degrees with respect to the line B. The portions having different internal shapes are formed by post-processing, so that the left and right split cases 13L and 13R are formed.
The shape of the mold is made common so that only one set of molds is required.

That is, on the input shaft side of the planting case, the cover member 3 of the auxiliary frame 32 is provided on the left split case 13L corresponding to the attachment of the cylindrical case 17 in the right split case 13R.
2a is bolted. The input shaft bearing case portion 33 in the left split case 13L and the input shaft holder portion 34 in the right split case 13R are molded in a shape including both of them. It is distinguished.

The bent spring plate 35, which is a tension mechanism (tight toner) for tensioning the chain 30, has both ends formed with concave portions (an example of a supporting portion) 36, which are molded into the left and right split cases 13L and 13R, respectively. It is attached by inserting it into 36. That is, it is installed in the planting case 13 using the elasticity of the spring plate 35. Since the left and right split cases 13L and 13R have a symmetrical shape, a dummy recess 36 is also formed on the side where the spring plate 35 is not provided. Although not shown, the left and right split cases 13L,
It is also possible to adopt a structure in which pin-shaped protrusions are formed from 13R in an abutting and opposing arrangement, and a chain tensioner that swings around both protrusions is provided.

The input shaft 28 includes a feed case output shaft 2
A driven-side flange 28b for forming the ridge-side clutch C is formed in a pair with the driving-side flange 26a that rotates integrally with the shaft 6, and the holder from which the bearing case portion 33 of the right split case 13R is removed. Portion 34 is driven flange 28b to hold input shaft 28 near its normal position where feed case output shaft 26 is internally fitted.
It is configured to be close to the outer periphery of. That is, the holder portion 34 has a portion close to the outer periphery of the driven side flange 28b and the side surface on the feed case side, and the lateral outside of the input shaft 28 is fitted inside the bearing 37. Input shaft 2 even if extracted
8 hardly moves.

As shown in FIGS. 5 and 6, the engagement and disengagement between the claw portion 28t formed on the input shaft 28 and the claw portion 26t formed on the drive side flange 26a is determined by the right split case 13R.
Cam 55 rotatably supported by the bearing portion 54
A ridge-side clutch C is configured as described above. That is, when the flat cam portion 55a at the tip of the clutch cam is in a state where the uneven surface thereof is along the rotation direction of the input shaft 28 (the state shown in FIG. And the clutch cam 55 is rotated so that the spring 57
The biased drive flange 26a is moved in the axial direction, and when the cam portion 55a is in the axial direction of the input shaft 28 (the state shown in FIG. 5B), the two claw portions 26t, 28t are disengaged. Then the clutch is disengaged.

However, the cam portion 55 can enter and move only into one notch portion 56 formed on the driven side flange 28b of the input shaft 28, and the disengagement state of the ridge-side clutch C is always the cam portion 55a. Appears only at the position where it fits into the notch 56. Thus, the ridge-side clutch C is configured as a fixed-position stop clutch that always stops in a state where the pair of planting arms 15 floats above the ground when the cutting operation is performed. The support portion 54 is formed by molding at a position including the holder portion 34, and the solid support portion 54 in which the left split case 13L is not drilled is provided with the support portion 54 of the right split case 13R. Exists in the opposite position.

As shown in FIG. 3, the driven sprocket 29a is rotatably fitted on the driven shaft 29 and the driven sprocket 29a.
The jump clutch D is constituted by a clutch rotating body 38 fitted outside the spline to the clutch 9 and a winding spring 39 for urging the clutch rotating body 38 against the driven sprocket 29a. As shown in FIG. 7, the driven sprocket 29a
Is mounted on the driven shaft 29 so as to be relatively rotatable.
And an engaging portion 18 provided with press-formed sprocket teeth and a tapered clutch pawl 41 are welded.

As shown in FIG. 3, the rotating case 1 is attached to the output shaft 29 of the planting case 13 so as to be relatively rotatable.
No. 4 cylindrical boss 43 which meshes with the sun gear 42 so as not to rotate relative thereto.
Are formed by an insert member integrated when the planting case 13 is formed by a mold. The functions related to the cylindrical boss 43 and the sun gear 42 and their engagement are to realize a drive structure as an implanting mechanism a described below.

As shown in FIGS. 9 and 10, the planting case 1
3 is mounted on the lateral side of the rear part so as to rotate the rotation case 14 in the rotation direction F around the first left-right axis X1 by the rotation of the output shaft 29, and at the opposite ends of the rotation case 14 in the longitudinal direction. An end of a support shaft 48 rotatably supported at the tip of the rotating case 14 with a planting arm 15 having a seedling claw 44 and a seedling pushing operation mechanism E at two places having a phase difference of degrees. It is attached so as to rotate about the second axis X2 in the left-right direction by being connected to the unit in an integrally rotating state.

The rotary case 14 has a two-part structure in which half case parts 14A and 14B each having a dividing line Y are bolted, and the center of the right half case part 14A in the longitudinal direction is mounted on the cylindrical boss 43 by a bearing. The bearing 13a, which is rotatably mounted via a shaft 45, is integrally rotated via a taper pin 47 at the end of the output shaft 29 which passes through the cylindrical boss 43, at the center of the left half case part 14B in the longitudinal direction. Connected to state.

A sun gear 42 externally rotatably fitted to the output shaft 29, a first intermediate gear 49 having a third axis X3 between the first axis X1 and the second axis X2, and a fourth axis. Heart X4
, A planetary gear 51 that rotates integrally with the support shaft 48, and a first intermediate gear 49 and a second intermediate gear 50.
An eccentric crank type interlocking mechanism G extending between the rotation case 14 and the eccentric crank type interlocking mechanism G is provided in the rotating case 14. By the interlocking mechanism G, the first intermediate gear 49 causes the second intermediate gear 50 to rotate at an irregular speed.

Sun gear 42 and cylindrical boss 4 of planting case 13
3, the planting case 13 is connected to the sun gear 42.
Are fixed so that they cannot rotate, and the first intermediate gear 49 and the sun gear 42 are engaged with each other, and the second intermediate gear 50 and the planetary gear 51 are engaged with each other. An interlocking transmission mechanism S is configured to interlock and rotate the sun gear 42 and the planting arm 13 in the same direction.

That is, the rotation of the rotating case 14 and the fixing of the sun gear 42 cause the first intermediate gear 49 to rotate around the third axis X3, and the rotational force of the first intermediate gear 49 is reduced.
2, the second intermediate gear 50 rotates around the fourth axis X4. Then, due to the eccentricity between the third axis X3 and the fourth axis X4, the crank pin 52 transmits the rotational force while sliding back and forth in the cam groove 53 in the radial direction of the first intermediate gear 49. Therefore, the interlocking mechanism G causes the second intermediate gear 50 to rotate at an unequal speed even when the first intermediate gear 49 rotates at a constant speed, and causes the first intermediate gear 49 and the second intermediate gear 50 to rotate in an interlocking manner. To work.

The sun gear 42, the first and second intermediate gears 49,
The assembling positional relationship between the rotation case 14, the planetary gear 51, and the rotating case 14 is set such that the rotating case 14 and the planetary gear 51 rotate relative to each other. Therefore, the rotating case 1
4, the pair of planting arms 15, 15 and the rotating case 14 are driven so as to rotate relative to each other, and the pair of planting arms 15, 15 are respectively attached to the seedling planting claws 44. Seedling exercise | movement which the front-end | tip part draws the elliptical locus | trajectory T1 shown in FIG. 8 is performed. In addition, when the phase of the planetary gear 51 changes in the negative direction, the planting arm 15 rotates in the upward direction to the ground, and when the phase of the planetary gear 51 changes in the positive direction, the planting arm 13 moves in the positive direction. Rotate in the downward direction.

[Alternative Embodiment] In the planting case 13, the left and right split cases 13L and 13R may be completely the same with the same mold and the same post-processing. The point is that the molding dies may be the same.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a system diagram showing a schematic transmission system of a planting section.

FIG. 3 is a development view showing the internal structure of the planting case.

FIG. 4 is a side view showing the structure of the tension mechanism.

FIG. 5 is a cross-sectional view of a ridge-side clutch portion, wherein (a) shows a clutch engaged state and (b) shows a clutch disengaged state.

FIG. 6 is a side view showing a fixed position stopping structure of a ridge-side clutch.

FIG. 7 is a sectional view of a driven sprocket constituting the jump clutch.

FIG. 8 is a side view showing a movement locus of the planting mechanism.

FIG. 9 is a sectional view of a seedling planting mechanism.

FIG. 10 is a side view showing the gear arrangement in the rotating case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Feed case 13 Planting case 13L Left split case 13R Right split case 14 Rotating case 26 Feed case output shaft 28 Input shaft 29 Output shaft 31 Transmission mechanism, chain interlocking mechanism 34 Holder part 35 Tension mechanism 36 Supporting part 42 Sun gear 43 Tube Boss a Planting mechanism

Continued on the front page (72) Inventor Takeo Kuboshita 64, Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Works, Ltd. F-term (reference) 2B062 AA14 AB01 BA13 2B065 AA05 AA07 AB01 AC06 BB03 BB15

Claims (4)

[Claims] 1. A planting case having an input shaft receiving power from a feed case, an output shaft for transmitting power to a planting mechanism, and a transmission mechanism for rotating these two shafts in an interlocking manner. A planting case structure in which left and right split cases that are symmetrical about the line connecting the output shaft are connected and integrated, and the shape of the left and right split cases is formed by molding. 2. A planting case including a chain interlocking mechanism including an input shaft receiving power from a feed case and an output shaft transmitting power to the planting mechanism, and tensioning the chain interlocking mechanism. A planting case structure in which a supporting portion of a tension mechanism to be formed is integrally formed with the planting case. 3. The planting case is provided with an input shaft receiving power from the feed case, an output shaft transmitting power to the planting mechanism, and a transmission mechanism rotating the two shafts in an interlocking manner. The output shaft of the feed case is configured as a cylindrical shaft which is internally fitted in a state of being integrally rotated, and a holder portion for holding the input shaft near the normal position where the output shaft of the feed case is internally fitted therein is provided. A planting case structure integrally formed with the planting case. 4. An input shaft for receiving power from a feed case, an output shaft for transmitting power to a rotating case for planting,
A transmission mechanism for interlocking rotation of these two shafts is provided in the planting case, and a cylindrical boss that is non-rotatably engaged with the sun gear of the rotating case in a state of being relatively rotatably fitted to the output shaft is formed by a mold. A planting case structure comprising an insert member integrated at the time of molding the planting case.