JPH10164930A - Gear shift operation structure for seedling planting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of the feed case of a rice transplanted by paying attention to a traverse feed gear shift operation structure. SOLUTION: A traverse feed gear shift mechanism C is constituted by arranging the four sets of the gear pairs of a normally engaged type over an input shaft 16 and a traverse feed shaft 17 side by side and this gear shaft operation mechanism Si of a shift key structure provided with a shifter 36 for shifting and moving a key 387 engaged in the key way 16a of the input shaft 16 so as to be engaged only with one of driving shaft is constituted. The shifting and moving route along the input shaft 16 of the shifter 36 is set to the state of entering the inside of the rotary track in a front-to-back direction view of the driving bevel gear 47 of a forward and backward PTO input shaft 15 bevel gear linked with the input shaft 16 and a space inside the feed case is effectively utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift operation structure of a feed case, which is a first power input portion from a traveling machine in a rice transplanter planting apparatus, and more particularly, to a feed case having a necessary function. The present invention relates to a technology for reducing the size of a computer.

[0002]

2. Description of the Related Art In a feed case of a rice transplanter, in addition to a power transmission function to a planting transmission case, a lateral feed drive function for reciprocating the seedling mounting table, and a laterally extending amount of seedlings. To change the traverse speed. Japanese Patent Laid-Open Publication No. 6-141635 discloses an overall slide structure in which four gear pairs are entirely shifted and driven by only one gear pair.
There are known a ball engagement structure for selecting only one of the driven gears disclosed in 133633, and an alternative selection structure of two sets of shift rotating bodies disclosed in Japanese Patent Application Laid-Open No. 6-153636.

[0003]

Since the rice transplanter runs on a wet rice field, the lighter one has the necessary functions for planting work and the lighter the one, the less the running wheel sinks, and the more the rice field is not damaged. It can be planted. In other words, if the number of planting strips is the same, the lighter the weight as a rice transplanter, the higher the performance will be. Therefore, for example, in Japanese Patent Application No. 8-2653 filed earlier, by reviewing the function of each part, A lightweight four-row rice transplanter has been proposed in which the weight is reduced as much as possible without reducing necessary functions. Therefore, an object of the present invention is to realize a weight reduction of a feed case by focusing on a lateral feed speed change operation structure.

[0004]

[Means for Solving the Problems]

[Configuration] A first invention is directed to a lateral feed shaft for laterally driving a seedling mounting table, an input shaft constituting a transverse feed mechanism across the transverse feed shaft, and a driven bevel gear of the input shaft. In the speed change operation structure of the seedling planting device, which has a drive bevel gear that meshes with the shaft, and a vertical transmission shaft that receives power from the body, a transverse feed mechanism is rotatably fitted to the input shaft. A plurality of gear pairs, which are always engaged with a driven gear and a driven gear fitted to the transverse feed shaft in an integrally rotating state, are arranged in parallel, an engagement groove formed in each drive gear, A key groove formed in the input shaft, a shift key slidable in a state engaged with the key groove, and engageable with only one of the plurality of engagement grooves; And a shifter that slides the gear to form a shift operation mechanism. , The shift movement path along the input shaft of the shifter, characterized in that it is set to a state enters into the rotational locus of the drive bevel gear in the longitudinal direction as viewed.

According to a second aspect of the present invention, in the first aspect, a lever guide of a lateral feed shift lever for shifting a shifter is provided.
It is characterized in that it is formed on a lever guide member of a picking amount adjusting lever for adjusting the picking amount of the seedling mounting table in the vertical feeding direction.

According to the first aspect of the present invention, the shift operation of the traverse transmission mechanism selects and drives one of the gear pairs by a shift operation of a shift key.
The structure is simpler than that of any of the aforementioned publications,
A light operation force is sufficient, and the space required for the speed change operation is small. By the way, since the shift stroke of the shift key needs to be relatively long from one end of the plurality of gear pairs to the other end, the shift stroke is simply set as a required dimension in design. When the layout is performed, for example, the input bevel gear mechanism and the plurality of parallel gear pairs are separated from each other as described in the above-mentioned publications of the former and the middle, and the width of the feed case is likely to be increased.

However, since the shift movement path along the input shaft of the shifter is set to enter the rotation locus of the drive bevel gear when viewed in the front-rear direction, the shift operation of the shifter 36 is required as shown in FIG. Due to the presence of the input bevel gear mechanism B, the space around the input shaft 16 at the drive bevel gear 47, which was conventionally a dead space, can be overlapped, and a space dedicated to the movement of the shifter 36, that is, a feed case, This makes it possible to reduce the width of 10.

According to the second aspect of the present invention, since the lever guide of the transverse feed shift operating lever is formed on the lever guide member of the vertical feed shift lever, one guide member can serve as two types of lever guides. . Therefore, compared with the case where the lateral feed shift lever and the vertical feed shift lever are separately provided, one part of the lever guide can be reduced, and the two types of levers are integrated in the same place. It is easy to perform the operation for adjusting the amount of seedlings to be taken, because it is less likely that the user will make a mistake.

[Effect] Even in the speed change operation structure according to the first or second aspect, the structure is simplified and lightened by adopting the shift key type, but the width of the case is not increased due to the structure, and the ratio is reasonable. In addition, the size and weight of the feed case were reduced.

According to the second aspect of the present invention, the space for the transverse feed operation device can be reduced by using the lever guide, and the feed case and its speed change portion can be downsized. Obtained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a lightweight four-row rice transplanter, 1 is a body, 2 is a lifting link mechanism, 3 is a planting section, E is an engine, 5 is a belt transmission mechanism, 6 is a front transmission, and 7 is a front wheel. , 8 is a rear wheel, 9 is a planting mechanism, and 10 is a feed case. As a transmission system, the front wheel 6 is driven by the front transmission 6 to which engine power is input, and the rear transmission 12 is driven by the transmission shaft 11 extending rearward from the front transmission 6 to drive the rear wheel 8. In addition, the PTO transmission shaft 13 extending rearward from the front mission 6 is input to the feed case 10 via the interlocking shaft 14 to drive the planting mechanism 9.

Next, the transmission structure of the feed case 10 will be described. As shown in FIGS. 3 to 5, the feed case 10 is connected to an interlocking shaft 14 to receive a PTO power in a vertical transmission shaft 15, and an input interlocked to the vertical transmission shaft 15 via a bevel gear interlocking mechanism B. Axis 16, this input axis 1
6 and the transverse feed shaft 1 which constitutes the transverse feed mechanism C
7 and an output shaft 19 for transmitting power to each planting transmission case 18.

The input shaft 16 has a bearing 20 at one end.
The bearing 2 is directly supported by the feed case 10, and the other end thereof is connected to the bearing 2 through a passive gear 21 externally fitted thereto.
2 supports the feed case 10. or,
An output shaft 19 is provided between the passive gear 21 and the transverse feed mechanism C.
And a drive sprocket 23 for interlocking with the chain.

The lateral feed shaft 17 has a drive gear 24 engaged with the above-described passive gear 21 fitted on one end thereof in an integrally rotating state, and a helical shaft for reciprocating lateral feed of the seedling mounting table 4 on the other end. A coupling 26 for interlocking driving of the bearing 2 is fitted, and the other end is connected to the bearing 2 via a helical shaft 25.
7 is supported.

The traverse transmission C has four different speed reduction ratios.
The gear pairs are arranged side by side. That is, the four drive gears 28 to 31 fitted to the input shaft 16 and the four driven gears 32 to 35 fitted to the traverse shaft 17 are always arranged in an occlusal state, and A shift operation mechanism si having a shift key structure for selecting only one of the drive gears and rotating integrally with the input shaft 16 is provided. A long keyway 16a is formed in the input shaft 16, and engagement grooves 28a-31a are formed in each of the drive gears 28-31. A key 37 operated by the shifter 36 is engaged with the keyway 16a. At the tip of the key 37, a convex portion 37a that engages with only one of the engagement grooves 28a to 31a is formed. The first-speed drive state appears when it is located in the mating groove, for example, the first engagement groove 28a.

The shifter 36 has an operation groove 37b of a key 37.
Is engaged with the input shaft 16 so as to be slidable in the engaged state, and is slid in the axial direction by a stroke amount corresponding to the length between the first speed drive gear 28 and the fourth speed drive gear 31. is there. When the shift movement path L along the input shaft 16 enters the rotation locus of the drive bevel gear 47 when viewed in the front-rear direction, that is, when the shifter 36 is located immediately adjacent to the driven bevel gear 48, the key The convex portion 37a at the tip engages with the first speed drive gear 28. That is, in the first to third speeds, the shifter 36 is located within the rotation locus of the drive bevel gear 47 when viewed in the front-rear direction. Reference numeral 49 denotes a spring member for urging the key 37 to protrude in the shaft outer radial direction, and is securely engaged with the shifter 36 and each of the engagement grooves 28a to 31a.

The aforementioned passive gear 21 has a shaft portion 21A.
Is formed on a cylindrical shaft and protrudes out of the feed case 10, and a vertical feed shaft 39 for driving a vertical feed mechanism can be fitted into the key connection inside the protruding shaft portion 21a. The input shaft 16 is fitted inside the feed case 10 of the shaft portion 21A so as to be relatively rotatable, and the internal space of the shaft portion 21A is reduced in a portion between the input shaft 16 and the vertical feed shaft 39. A partitioning shielding member 40 is provided. The shielding member 40 is formed of a lid that is press-fitted and fitted into the shaft portion 21A, and prevents leakage of the lubricating oil in the feed case 10.

As shown in FIGS. 3, 4, and 8, a pair of drive arms 4 for kicking a driven arm 42 of a vertical feed mechanism 41 is mounted on a vertical feed shaft 39 interlocking with the passive gear 21.
3 is provided. The drive arm 43 bends a steel plate into a U-shape, supports the pin 45 with the roller 44 at its open end in a double-supported state, and tightens the bolt 46 inserted in the bent side to the vertical feed shaft 39. It is fixed. The vertical feed shaft 39 is formed with a recess 39a for the bolt 46, and has a structure in which the position is not shifted in the axial direction if the bolt 46 is tightened. The helical shaft 25 protrudes from the feed case 10 on the side opposite to the vertical feed shaft 39, and allows the rotation trajectory of the drive arm 43 and the helical shaft 25 to interfere in a side view.

Incidentally, in the lateral feed transmission mechanism C, it is necessary to enable the speed change operation only when the seedling mounting table 4 is located at the stroke end of the lateral feed (a detailed description of the prior art is omitted). Therefore, in this structure, each of the four gear ratios is set so that the four engagement grooves 28a to 31a are aligned in the transverse feed stroke end state only. In this state, the attitude of the drive arm 43 is also kept constant.

That is, the seedling mounting table 4 is set so as to traverse from end to end when the helical shaft 25 has just rotated 13 times, and the gear ratio of the first to fourth speeds is 1 in the traverse transmission mechanism C. Speed: 30/13 second speed: 22/11 third speed: 20/13 fourth speed: 16/13, and the reduction ratio of the drive gear 24 and the passive gear 21 to 26/18 = 13/9, respectively. I have.

Therefore, when the helical shaft 25 makes 13 rotations, the number of rotations of each of the drive gears 28 to 31 is as follows: first speed drive gear 28: 13 × 30 ÷ 13 = 30 rotations second speed drive gear 29: 13 × 22 ÷ 11 = 26 rotations Third speed drive gear 30: 13 × 22 ÷ 13 = 20 rotations Fourth speed drive gear 31: 13 × 16 ÷ 13 = 16 rotations, all of which are integral multiples of the number of times, and the key 37 is shifted It can be moved freely. When the spiral shaft 25 makes 13 rotations, the vertical feed shaft 39 becomes 13 × 9 ÷ 13 = 9 rotations, which is also an integral multiple of the number of rotations. The drive arm 43 always takes the same posture.

As shown in FIGS. 2, 4, 7, and 8, a lateral feed shift lever 50 for manual operation is directly attached to the protruding end of the shift shaft 38. It is formed on a lever guide member 52 of a take-up amount adjusting lever 51 that controls the take-up amount in the vertical feed direction. The tip of an adjustment arm 53 having a bell crank structure linked to the take-up amount adjustment lever 51 is engaged with the operated portion 4a of the slide rail 4A at the lower end of the seedling mounting table 4, and the slide rail is operated by operating the lever 51. A well-known structure that can change the relative vertical position of the 4A with respect to the seedling mounting table 4 is adopted.

Up and down slidable slide bars 54 are fitted into upper and lower support stays 18a and 18b formed on the side surface of each planting transmission case 18, respectively. The slide rail 4A is attached. That is, as shown in FIG. 6, when the slide bar 54 slides with respect to the support stays 18a and 18b,
The sliding rail 4A is moved up and down by operating the take-up amount adjusting lever 51. Then, each support stay 18a, 18
A bush 55 closely fitted to the slide bar 54 is mounted on the slide bar 54b.
Even if there is a gap between the support stays 18a and 18b or the shaft becomes unstable, no gap is formed by the elastic deformation of the bush 55. Sand trash etc. are prevented from entering.

[Another embodiment] Shaft 21A of passive gear 21
Is formed on a shaft having a solid cross section, and the input shaft 16 and the longitudinal feed shaft 39 are formed.
A structure is also possible in which each end is formed on a cylindrical shaft and externally fitted to the shaft 21A.

[Brief description of the drawings]

Fig. 1 Side view of rice transplanter

FIG. 2 is a side view of the planting section.

FIG. 3 is a plan view showing a transmission structure of a planting portion.

FIG. 4 is an exploded view showing a transmission structure in the feed case.

FIG. 5 is a side view showing a main part of a shift operation portion of the lateral feed speed change operation mechanism.

FIG. 6 is a partially cutaway side view showing a vertical adjustment structure of a sliding rail of a seedling mounting table.

FIG. 7 is a front view showing a lever guide of the lateral feed shift lever.

FIG. 8 is a side view showing a structure of a seedling vertical feeding mechanism.

[Explanation of symbols]

 4 Seedling stand 15 Vertical transmission shaft 16 Input shaft 16a Key groove 17 Lateral feed shaft 28-31 Drive gear 28a-32a Engagement groove 32-35 Follower gear 36 Shifter 37 Key 47 Drive bevel gear 48 Follower bevel gear 50 Lateral feed shift lever 50G Lever guide 51 Take-off adjustment lever 52 Lever guide member si Speed change mechanism C Lateral speed change mechanism

Claims (2)

[Claims] 1. A lateral feed shaft for laterally driving a seedling mounting table, an input shaft that constitutes a transverse feed mechanism across the transverse feed shaft, and a driven bevel gear of the input shaft. A shift operation structure of a seedling planting device having a drive bevel gear and a vertical transmission shaft receiving power from an airframe, wherein the transverse feed mechanism is relatively rotatably fitted to the input shaft. A plurality of gear pairs each of which is always engaged with a drive gear mounted thereon and a driven gear fitted in a state of being integrally rotated on the lateral feed shaft, and is formed in parallel with each other. A groove, a key groove formed in the input shaft, and slidable in a state engaged with the key groove, and capable of engaging only one of the plurality of engaging grooves. Shift operation including a shift key and a shifter that slides the shift key Thereby constituting a configuration, the input shaft along the shift path of movement of the shifter, the shift operation structure that has been set seedling planting apparatus in a state of entering the rotational locus of the drive bevel gear in the front-rear direction as viewed. 2. A lever guide of a lateral feed shift lever for shifting the shifter is formed on a lever guide member of a picking amount adjusting lever for adjusting a picking amount of the seedling mounting table in a vertical feed direction. 2. The shift operation structure of the seedling plant according to 1.