JPS6021930Y2 - Power transmission device in rice transplanter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a power transmission device to a riding type or walking type seedling planting device.

When installing a clutch mechanism to connect and disconnect the power transmission from the power source of the rice transplanter to the seedling planting device, when the seedling planting device is stopped, the planting claws of the seedling planting device will It is well known to provide a locking portion for stopping the planting claw at an upper position so as not to stop in contact with the base.

In this case, in the power transmission device, the clutch body rotates integrally with the driven shaft that interlocks with the planting claw and is slidably fitted therein, while the main drive rotating body that meshes with the clutch body rotates integrally with the driven shaft that interlocks with the planting claw. If it is configured so that it is loosely fitted to the shaft but cannot be moved in the axial direction, the power transmission clutch body is moved back from the main drive rotary body using a shifter to disengage the two, and then the clutch body is By retreating and engaging the locking part of the clutch body with a protrusion on the case of the power transmission device, the rotation of the driven shaft is stopped at a predetermined rotational phase position, and the planting claw is moved to the upper position. must be stopped.

Therefore, when the clutch body moves backward, the clutch body engages with the protrusion from the moment it disengages from the drive rotor, so that the clutch body does not engage with the drive rotor and the protrusion at the same time. If the clutch body has a large retraction margin, it becomes difficult to move the clutch body quickly due to sickness, and if this occurs, the clutch body may become disengaged from the main drive rotating body. If the engagement phase relationship between the clutch body and the protrusion shifts while the latter clutch body is retracting, the clutch body will not be able to engage unless it makes one rotation thereafter.

During this time, the planting claw also rotates once and takes out the seedlings from the seedling stand, which means that the seedling work will be interrupted, either by planting more seedlings than necessary or by wasting the taken out seedlings. Therefore, in this invention, power transmission to the seedling planting device is not efficient.
When the planting claw of the seedling planting device is stopped at the upper position in the FF clutch mechanism, a stopping part is provided, and an intermediate engagement rotating body is provided between the clutch body and the main driving rotating body, and the clutch body slides in the direction of stopping the driven shaft. The clutch body is inserted so as to slide back and forth in synchronization with the movement of the clutch body, so that the clutch body and the intermediate mesh rotor can be quickly disengaged while maintaining the mesh between the intermediate mesh rotor and the main drive rotor. The body is configured to allow the planting claw to slide to the upper stop position very easily, thereby preventing the dog clutch from being engaged at the planting claw upper stop position. The purpose of this is to enable quick engagement with the protrusion for stopping the upper part of the claw.

Next, an explanation will be given of an embodiment drawing in which the present invention is applied to a six-row riding type rice transplanter. This figure shows a horizontally bendable fuselage in which brackets 5 and 4' protruding from the top and bottom of the front end of the fuselage 3 are pivoted with pins 6 and 7 on the vertical line of each joint.
Attach axle cases 8, 8, 9, 9 to both left and right sides of the
A wheel 12 is attached to the tip of each axle case via swing arms 10, 10 and 11.11 which are rotatably attached to the axle case.
, 12, 13, and 13 are mounted so as to be movable up and down, and each swing arm is urged in a downward rotational direction by a leaf spring or the like.

The engine 16 is attached to the rear end of the rear fuselage 3, and the rear fuselage 3
Inside, a transmission shaft 20 is provided at an appropriate height from the input shaft 19 and is gear-coupled with the input shaft 19, and a running shaft 23 is supported parallel to the lower part of the transmission shaft 20, while the front body 2 is hollow. The transmission case is formed into a shaped transmission case, and a transmission shaft 24 is supported at the same position as the transmission shaft 20 of the rear fuselage 3, and a running shaft 25 is supported at the same position as the running shaft 23 of the rear fuselage 3.
0.24 and both running axes 23.25 are both front and rear running axes 2.3
The connecting pins 6.7 are bendably connected on the center line of the connecting pins 6.7 by Parfield-type free-cutting pins 26.27, etc., and are connected to the fuselage via a differential gear mechanism from the running shafts 23, 25 in the front and rear fuselages 2, 3. Axle case attached to both sides 8. 8
．． 9. Power is transmitted to each wheel via the axle in 9.

In addition, the pitman arm of the steering gear box 29 is connected to the rear fuselage 3 via a rod in conjunction with the handle 28 installed upright on the fuselage 2, and the bending direction of both the fuselage bodies 2 and 3 is determined by rotating the handle 28. The front fuselage 2 has a gate-shaped safety frame 30 erected in the direction of travel at a position behind the handle 28, and a seat can be mounted on the front fuselage 2. 31
is installed.

Reference numeral 32 denotes a six-row seedling planting device located in front of the front body 2, and the device 32 includes a mission case 33, a planting claw 34 attached to its tip, a seedling stand 35 attached to its upper surface, and the case. The seedling planting unit 37 consisting of the float 36 on the lower surface is
It consists of a pair of left and right lower rings 38, 38 and one top link 39 for the front fuselage 2.
The input shaft 41 of the seedling planting device 32 is connected to the front body 2 so that it can move up and down. Power is transmitted via a telescoping shaft 43 that connects the driven shaft 42 that protrudes from the front and serves as a PTO shaft.

And inside the front body 2, it is connected to the transmission shaft 24,
In addition, there is a p'ro transmission mechanism 45 operated via a transmission lever operated from the top of the aircraft, and the PTO transmission mechanism 45
The power is transmitted to a clutch mechanism 48 for stopping the planting claw upper position, which will be described later, through a gear 47 fitted on the output shaft 46 of the clutch mechanism 48.

The clutch mechanism 48 for stopping the upper position of the planting claw is located in front of a driven side meshing clutch body 49 that is slidably engaged with a spline in the middle of a driven shaft 42 that becomes a PTO shaft that protrudes from the front part of the front body 2. A portion is formed into a stop portion 50 and a rear portion is formed into a driven side dog clutch portion 51, and power is transmitted from the main rotary body 5 to which power is transmitted from the PTO transmission mechanism 45 to the driven side dog clutch portion 51 in the clutch body 49. At this time, by interposing the intermediate engagement rotating body 53 that periodically slides back and forth along the axis of the driven shaft between the two, the engagement-clutch is prevented from being released outside the upper stop position section of the planting claw. At the same time, with the sliding distance of the clutch body 49 in the upper stop direction reduced, the intermediate engagement rotating body 53
This allows the meshing state to be quickly released.

That is, the clutch body 49 is constantly pressed in the direction of an intermediate mesh rotating body 53 (described later) by the spring 54 of the clutch body 49, and is engaged with the shifter 55, and the driven side mesh clutch portion is rotated by rotating the lever 56 of the shifter 55. 51 is arranged to retreat from the intermediate mesh rotating body 53.

On the other hand, a protrusion 57 is provided inside the fuselage case in the radially inward direction of the clutch body 49, and the stop portion 50 at the front of the clutch body 49 has a flange in which a part of the circumference is appropriately cut out in a fan shape with a circumferential angle θ1. In other words, as shown in Fig. 8, the circumferential angle θ1 is cut out from 50a to 50b, and the clutch body 49 rotates in the direction of arrow A as shown in Fig. 5. In this case, as the clutch body 49 is slid in the direction of the protrusion 56 by a distance H1, the stop portion 5
After the rear end 50a of the stopper 50 in the rotational direction can fit into the protrusion 57, and after the rear end 50a of the stopper 50 enters the back end 57a of the protrusion 57, the clutch body 49 rotates through an angle θ1. By further sliding in the direction of the protrusion 57, the stop portion front end 50b comes into contact with the protrusion front end 57b and stops the driven shaft 42, as shown in FIG.
At the stop position of the driven shaft 42, the planting claws 34 of the seedling planting device are positioned above the road.

Further, the gear 52' serving as the main rotating body 52 is connected to the driven shaft 42.
It is non-slidably but rotatably fitted in the rear part of the gear 52', and is non-slidably provided at a position facing the clutch body 49 and on the same axis as the clutch body 49. An interlocking pawl 58 is formed in the.

Furthermore, when the intermediate meshing rotating body 53 is loosely fitted between the clutch body 49 on the driven shaft 42 and the gear 52' which is the main driving rotating body 52, the intermediate meshing rotating body 53 is
It is configured to freely slide along the axes of the clutch body 49 and the main drive rotor gear 52', and the meshing pawl of the main drive rotor gear 52' is provided on the back surface of the intermediate mesh rotor 53. An interlocking pawl 59 that meshes with the intermediate interlocking rotating body 53 is formed.
A driving side dog clutch portion 60 is formed on the surface of the clutch body 49 so as to mesh with the driven side dog clutch portion 51 of the clutch body 49 only in a determined phase, and a stop portion of the clutch body 49 is formed on the same surface side. At the phase position corresponding to the fan-shaped notch with the circumferential angle θ1 at 50, the appropriate height H in the axial direction is
2 (however, H2<Hl) is provided over a section of circumferential angle θ2, and the rear end of the front cam portion 61 in the rotational direction is connected to the front end 50b of the stop portion 50 of the clutch body 49. A spring 62 is installed between the intermediate mesh rotor 53 and the main drive rotor gear 52' to connect the intermediate mesh rotor 53 to the clutch body. The driven side dog clutch portion 52 is configured to be constantly pressed in the direction of the dog clutch portion 51 .

Further, reference numeral 63 denotes a contact protrusion protruding from the shifter 55 or an appropriate location within the fuselage case;
3. The front cam portion 6 of the intermediate engagement rotating body 53
1, and as the intermediate mesh rotor 53 rotates, the intermediate mesh rotor 63 itself slides backward from the clutch body 49 by the height H2 of the front cam part 61 in the determined phase interval θ2. However, the shifter 55
When the is maintained in the posture shown in FIG. 6, the meshing portions of the main drive rotary body 52, the intermediate mesh rotary body 53, and the clutch body 49 are not engaged in other intervals other than the phase interval θ2. It is regulated so that it cannot be lifted.

Note that the retraction section θ2 of the intermediate mesh rotor 53 formed by the abutment protrusion 63 and the front cam portion 61 may be formed in an area that almost overlaps with the fan-shaped notch section θ1, as shown in FIG. In order to appropriately change the position of the protrusion 63 to an optimal position, the position may be changed to an appropriate section that is synchronized with the fan-shaped notch stop section θ1.

In other words, the retracting section θ2 of the intermediate engagement rotating body 53 between the abutment protrusion 63 and the convex front cam portion 61 is the clutch body 4
It is arranged so that it occurs in substantially the same phase as the fan-shaped notch section θ1 (the notch section from 50a to 50b) of the stop portion 50 at 9.

With this configuration, the fuselage 1 is advanced while the float 36 of the seedling planting device 32 is sliding on the field, and the engine 16 is
The power is transmitted to the driven shaft 42 which is the PTO shaft of the gate and transmission mechanism 45.
By transmitting power to the planting claws 34 through the seedling platform 35, the planting claws 34 can be oscillated and rotated to separate the seedlings from the seedling platform 35 one by one, while planting seedlings along multiple rows. To stop the movement of the planting claw 34 when changing direction at the edge of a ridge or temporarily stopping seedling planting work, the wire 64 and the lever 56 can be stopped using an operating lever (not shown) provided near the seat 31. By rotating the shifter 55 through the lever and sliding the clutch body 49 by a distance H1 in the direction of the protrusion 57 of the case against the spring 54, the notch of the stop portion 50 on the front surface of the clutch body 49 is moved to the protrusion 57. In this section, when the shifter 55 is further rotated, both 53.49
slide in opposite directions, and the front end 50b of the stop portion on the front surface of the clutch body 49 comes into contact with the front end 57b of the protrusion, and the driven shaft 4
2 can be stopped immediately and the planting claw 34 can be stopped when it reaches the upper position, thereby preventing the planting claw from being damaged.

At this time, according to the present invention, when the shifter 55 is not operated, there is a sliding margin along the axis of the driven shaft 42 between the stop part 50 on the front surface of the clutch body 49 and the projection part 57 inside the case, as shown in FIG. There is only a distance Hl.

Next, as shown in FIG. 6, when the shifter 55 is actuated to slide the clutch body 49 in the direction of the protrusion 57 in the case, the intermediate mesh rotating body 53 also slides in the same direction by the force of the spring 62.

Even in this state, the engaging pawl 59 of the gear 52', which is the main driving rotating body 52, and the engaging pawl 58 of the intermediate engaging rotary body 49 maintain an engaged state (see b in FIG. 12).

Since the tip of the contact protrusion 63 of the shifter 55 is in contact with the convex part of the front cam part 61, in the section corresponding to the angle θ2, as shown in C in FIG. The front cam part 61 and the abutting protrusion 63 restrict the retraction by a distance H2, so the depth of engagement of the dog clutch parts 51 and 60 is shallow, and the distance between the stop part 50 on the front side of the clutch body 49 and the inside of the case is reduced. The distance between the protrusion 57 and the driven shaft 42 axis is extremely close.

When the shifter 55 is further rotated in this state of shallow meshing, as shown in d of FIG.
Since the clutch body 49 is slid in the direction of the protrusion 57 in the case, it is extremely easy to release the dog clutch 51, 60 within the section corresponding to the fan-shaped notch section θl of the stopping portion of the clutch body 49.

Then, the fan-shaped notch section θ1 of the stop portion of the clutch body 49
By slightly rotating the shifter 55 within the corresponding section, the clutch body 49 is slid in the direction of the protrusion 57 of the case, and the stop portion 50 at the front of the clutch body 49 is moved.
is in contact with the protrusion 57, in other words, the planting claw is stopped at the upper position (see C in FIGS. 7 and 12).

In this way, in the present invention, as shown in FIG. Due to the front cam portion 61 of the rotor 53 and the abutment protrusion 63 of the shifter 55, the intermediate mesh rotor 53 slides back and forth by a distance H2 corresponding to the height of the cam portion 61 in synchronization with the notch stop section θ1. However, the abutting protrusion 63 and the spring 62 restrict the movement of the intermediate mesh rotating body 53 toward the clutch body 49, and the driving side mating clutch portion 60 of the intermediate mesh rotating body 53 of the driven side mesh clutch portion 51 of the clutch body 49 is regulated. The engagement width with the clutch body 49 is small (see C in Fig. 12), so the clutch body 49
It requires less force to slide.

Moreover, in the present invention, the clutch body 49 and the intermediate meshing rotating body 5
3, the clutch body 49 slides away from the intermediate engagement rotating body 53 by the shifter 55, while the intermediate engagement rotating body 53 also engages the clutch due to the contact of the front cam portion 61 with the contact protrusion 63. Since the clutch body 49 and the intermediate engagement rotary body 53 are slid in opposite directions, the clutch body 49 and the intermediate engagement rotary body 53 can be released very easily, and the stop portion 50 at the front of the clutch body 49 can be easily released.
With the front end portion 50b in contact with the protrusion 57, the driven side dog clutch portion 51 at the rear of the clutch body engages with the driving side dog clutch portion 60 of the intermediate mesh rotary body 53, causing a so-called overlapping mesh state in which it cannot be disengaged. This means that the operator can instantly time the operations of disengaging the clutch and stopping the planting claw at the upper position.

Note that, as in the above embodiment, if the rear end of the front cam portion 61 in the rotational direction overlaps the front end portion 50b at 50 of the stop portion of the clutch body 49 by an appropriate circumferential angle θ3, intermediate meshing can be achieved. When the rotating body 53 moves backward, the front end 50b of the stop portion 50 of the clutch body 49
Since the clutch is held in contact with the clutch for a while after the rotation has completely stopped, overlapping meshing can be more reliably prevented when the clutch is disengaged.

It goes without saying that the present invention can be applied to a traveling type rice transplanter, and in other embodiments, instead of the main drive side gear, a belt transmission pulley wheel or the like may be used as the main drive rotary body that is linked to the power source side. It may be configured.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a riding rice transplanter, Fig. 2 is a plan view thereof, Fig. 3 is a vertical side view showing a power transmission mechanism to the seedling transplanting device, and Fig. 4 The figure is a vertical side view of the main part of the clutch part of the present invention, Figure 5 is a sectional view taken along the line ■-v in Figure 4, Figure 6 is an explanatory view of the action seen from the same side as Figure 4, and Figure 7 is The figure is a front view of the clutch body, and Figure 9 is the IX of Figure 8.
- A sectional view taken along the line IX, FIG. 10 is a front view of the intermediate mesh rotating body, FIG. 11 is a sectional view taken along the xt-xt line in FIG. 10, a, b, C, d, e in FIG. FIG. 2 is an explanatory diagram showing the positional relationship between the intermediate mesh rotor and the protrusion depending on the shift state of the clutch body. 32... Seedling planting device, 34... Planting claw 4
2... Driven shaft, 45... PTO transmission mechanism, 46... Output shaft, 49... Clutch body, 50... Stop part , 51... Driven side dog clutch part, 60... Drive side dog clutch part, 52... Main drive rotating body, 53...
Intermediate meshing rotating body, 54, 62... Spring, 61.
... Convex front cam part, 63 ... Contact projection, 55 ... Shifter 57 ... Protrusion.

Claims (1)

[Scope of utility model registration request] In providing a mechanism for turning power transmission ON/OFF in the power transmission section to the seedling planting device, a driven shaft that is linked to the planting claw of the seedling planting device is pivotally supported in the case, and a clutch body is attached to the driven shaft as a shifter. The clutch body is fitted with a stop part with a part of the circumference cut out, and a stop part is provided in the case so that the clutch body slides and rotates integrally with the driven shaft. A protrusion is provided to stop the rotation by abutting the front end of the stop part on the front side in the rotational direction, and when the front end abuts the stop part, the planting claw of the seedling planting device is placed in the upper part. A driving rotating body connected to a power source is provided at a position opposite to the clutch body and on the same axis as the clutch body, and a driving rotating body connected to a power source is provided between the driving rotating body and the clutch body. is provided with an intermediate mesh rotor slidably along these axes, and the intermediate mesh rotor is urged by a spring in the direction of the clutch body, and the intermediate mesh rotor, the clutch body, and the main drive rotor are The body is provided with clutch portions that engage with each other on these opposing surfaces, and the intermediate mesh rotating body is further provided with an intermediate mesh rotating body by contacting a contact protrusion protruding from the shifter or case. A power transmission device for a rice transplanter, comprising a cam means configured to slide in a direction away from the clutch body in a section of a circumferential notch in a stop portion of the clutch body.