JP2536164B2 - Rice transplanter - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rice transplanter provided with an overload clutch.

(Prior art and its problem) Conventionally, there was a rice transplanter provided with an overload clutch configured to cut off power by overload in the forward direction in the transmission system to the planting device.

(Problems of the prior art) Conventionally, rice planting work was performed by a rice transplanter, and sometimes the planting tool of the planting device was broken at the edge of the ridge, but the reason was unknown.

Therefore, I was investigating the reason for this, but this time, the reason was found. That is, when the main clutch of the rice transplanter is disengaged on a sloping ground such as a ridge, the rice transplanter may move backward due to its weight and the wheels may reverse. At that time, due to the reverse rotation of the wheels, the transmission system to the planting device was also reversed, and the planting device was broken.

(Means for Solving the Problems) Therefore, in order to solve the above problems, the present invention provides
The following technical measures were taken.

That is, the present invention is a rice transplanter in which the power of the prime mover 11 is branched from the power transmission system I for transmitting the power to the wheels 4 and 6, and the power is transmitted to the planting device C. The rice transplanter is characterized by being provided with an overload clutch (50) configured so that power is disconnected by overload in either the rolling direction or the reverse direction.

(Advantageous Effects of the Invention) In the present invention, the transmission system II to the planting device C is provided with the overload clutch 50 configured so that the power is disconnected even by the overload in the reverse direction. Thus, it is possible to appropriately prevent the machine from being damaged.

(Example) The riding type rice transplanter which is one example of the present invention will be described in detail.

A is a riding type towing vehicle, B is a lifting link mechanism, C is a planting device, and this riding type rice transplanter is composed of A, B, and C described above.

First, the passenger-type tow vehicle A will be described in detail. The airframe is composed of a main mission case 1, a connecting frame 2, a vertical frame 3, a rear axle case 5, left and right transmission cases 5a and 5b, a front axle case 7 and the like. The connecting frame 2 has a U-shape in side view, and its tip is the main mission case 1
It is stuck to. Then, the diff case portion 7a of the front axle case 7 provided integrally with the diff case that houses the diff mechanism inside the connecting frame 2 is freely rotatable around the main transmission case 1 side and the vertical frame 3 fixed to the connecting frame 2. Concentrated on
I am

27 is a step which is formed in the same plane, and is provided in front of the cockpit 13 and on both left and right sides, and the engine cover 12 is formed integrally with this, and the prime mover mounted on the engine base 10 fixed to the vertical frame 3. The engine 11 as the engine cover 12
Covers the front and left and right sides. Then, left and right fenders 27a, 27a are integrally formed at the rear ends of the steps 27, 27 on the left and right sides of the cockpit 13 so as to cover the rear wheels 4, 4 formed higher toward the rear. Also, step 27
An auxiliary step 27b, which is formed one step lower, is provided at the front part of the.

The vertical frame 3 having the front end fixed to the connecting frame 2 is composed of a thick iron pipe in the illustrated example, and the rear axle case 5 is fixed to the rear end thereof. Inside the rear axle case 5, a diff mechanism or a side clutch mechanism is installed so that power is transmitted to the rear wheels 4, 4.

 5a and 5a are wheel transmission cases.

B is an elevating link mechanism, in which the bases of the upper link 29 and the lower link 30, 30 are pivotally connected to columns 28, 28 standing on the rear axle case 5, and the rear parts of both links are connected by a vertical link 31. Then, a downward arm 32 is fixed to the upper link 29, and the arm 32 is attached to the towing vehicle A side of the hydraulic cylinder 33.
Is configured to be activated by.

The planting device C has a seedling planting transmission case 34 as a machine frame, and a left and right reciprocating seedling placing table 35, a planting tool 36 attached to a rotary seedling planting case, and a leveling float 37, 38. , 38, etc., and the left and right middle front parts of the seedling planting transmission case 34 are attached to the vertical link 31 via a rolling shaft.

Here, the configuration of the planting tool 36 will be described. A rotating case 36b rotatably mounted on a side portion of a transmission case 34 'extending rearward from the seedling planting transmission case 34 by a drive shaft 36a.
The planting tool 36 is attached to the tip of the. Then, the planting tool 36 is provided with a seedling splitting claw 36c and a seedling pushing arm 36d, and the seedling pushing arm 36d swings by a rotating cam 36e. Is configured to move along. This seedling extrusion arm 36d
To explain in more detail about the movement of the above, when the seedling dividing claw 36c planted the seedlings divided from the seedling mounting table 35 in the field, the step portion 36g of the rotating cam 36e is located at the sliding contact portion 36h of the swing arm 36f. The swing arm 36f swings in the direction T by the biasing force of the spring 36i, and the seedling pushing arm 36d moves along the back surface of the seedling dividing claw 36c to plant the seedling in the field.

Next, the transmission mechanism will be described. Power from the engine 11 is transmitted via the pulley 15, belt 39, and pulley 17 to the hydraulic pump 16
Shaft 18 on the extension of the transmission shaft of this pump 16,
The transmission extends from a pulley 19 that extends forward to the side of the engine and is fixed to the tip of this shaft 18 via a belt 22 to a pulley 21 in which a main clutch 41 is installed.
The power is transmitted to the input shaft 20 of. And this input shaft 20
Is transmitted to the traveling drive shaft 23 via the speed change gear, and is transmitted to the front wheels 6 and the rear wheels 4. The traveling drive shaft 23
Extends into the differential case 7a of the front axle case 7 and extends rearward as a rear wheel transmission shaft 23a through the differential.

On the other hand, the power is transmitted from the power transmission system I for transmitting the power to the front wheels 6 and the rear wheels 4 via the inter-strain transmission gear D to the shaft 24 for driving the planting device C. And axis 24
Is once decelerated in the clutch case 25 via the overload clutch 50, the inter-substock transmission gear 51, and the planting clutch 52.
Projected rearward as shaft 26, and planting device C from this PTO shaft 26
Power is transmitted by the shaft 42 to the transmission case 34 with seedlings. In this way, the transmission system to the planting device C
II is configured.

Here, the inside of the clutch case 25 will be described in detail. The driving piece 50a of the overload clutch 50 is configured to be fitted into the angular shaft portion 24a of the shaft 24 and rotate integrally with the shaft 24. On the other hand, the driven piece 50b of the overload clutch 50 and the drive gear 51a of the inter-substock transmission gear 51 are slidable on the shaft 24 in the direction of the Hanni, and the spring 5
It is urged in the direction of C at 3. A convex portion 50a 'and a concave portion 50b' are formed on the joint surface between the driving piece 50a and the driven piece 50b, and the convex portion 50a 'and the concave portion 50a are formed.
An inclined surface 50c is formed on the side of normal rotation with b ', and a gentle inclined surface 50d is formed on the side of reverse rotation. Therefore,
The driving piece 50a and the driven piece 50b of the overload clutch 50 are coupled by the urging force of the spring 53, and the power is transmitted up to a certain load against the urging force of the spring 53, but when the certain load is exceeded. It is configured so that the driving piece 50a and the driven piece 50b are separated from each other against the urging force of the spring 53 and the power is not transmitted. still,
Since the inclined surface 50d on the reverse rotation direction side is formed as a gentle inclined surface as compared with the inclined surface 50c on the normal rotation direction side, it is more likely that the shaft 24 rotates in the reverse direction than the normal rotation of the shaft 24. The clutch can be released with a light load.

51b is a driven gear of the inter-substock transmission gear 51,
Is rotatably supported by a shaft, is axially moved by a shifter 54, and meshes with any one of the drive gears 51a. Further, an engaging piece 52a of a clutch is formed at an end of the driven gear 51b, and is configured to be engaged and coupled with another engaging piece 52b of the clutch biased by a spring 55. The engaging piece 52a and the engaging piece 52b form a planting clutch 52. Reference numeral 56 denotes a clutch actuating pin, which is operated in a hoe direction by a planted clutch lever 47 described later, and when operated in a hoe direction, the engagement piece 52a is engaged and coupled with the engagement piece 52b to generate power. When the pin 56 is operated in the e direction, the tip of the pin 56 engages with the cam surface 52b ′ of the engaging piece 52b, and the engaging piece 52b separates from the engaging piece 52a and power is not transmitted. Like

In the figure, 43 is a main clutch lever for turning on and off the main clutch 41, 44 is an auxiliary shift lever, and 45 is a change lever.
Reference numeral 46 is a hydraulic pressure switching valve, which is switched by vertical movement of the float 37 and operates the hydraulic cylinder 33 so that the float 37 is always kept at a ground pressure within a predetermined range.

Reference numeral 47 denotes a planted clutch lever, which is provided on the right side of the engine cover 12, including the other operating lever 48 provided on the left side, and the levers 47, 48 are moved above the cockpit 13 by its operation. Alternatively, it is arranged so as not to project forward so that it does not interfere with various operations.

Reference numerals 49, 49 denote left and right spare seedling mounts, which are provided outside the steps 27, 27 on the left and right sides of the cockpit 13, and their bases are fixed to the vertical frame 3.

According to the configuration of the above example, although the engine 11 is arranged at the front-rear intermediate position of the machine body, the bonnet cover is removed from the front portion of the machine body, and the handle support frame 9 is simply provided, Since the mission case 1 is located at the front of the airframe, the front-rear balance is lost, the front side does not float, and the planting device C can be stably towed. Moreover, the power from the engine 11 to the main mission case 1 is equal to that of the engine. It can be easily and conveniently transmitted through the hydraulic pump 16 that requires constant rotation on the side, and the power to the planting device C side can be transmitted by the transmission shaft on the side of the engine, which is balanced left and right. The power transmission structure facilitates assembly, and particularly, the power is transmitted to the main mission case 1 side by the front and rear belts 39 and 22, so that the belts can be easily replaced.

And, especially when rice planting work (seedling planting work) is being carried out toward the ridge and planting is carried out until the front wheel rides on the ridge, when the front wheel is riding on the ridge. When the main clutch lever 43 is operated to disengage the main clutch 41, the rice transplanter moves backward due to its weight, and the wheels 4 and 6 reverse. At that time, since the planting clutch 52 is still connected, the reverse rotation of the wheels 4 and 6 causes the traveling drive shaft 23, the inter-strain transmission gear D, and the shaft 24 to also reverse, so that the PTO shaft 26 also reverses and the planting device. The reverse power is transmitted to C. Then, the planting tool 36
The rotating cam 36e also rotates in the reverse direction, the step portion 36g of the rotating cam 36e contacts the sliding contact portion 36h of the swing arm 36f, the reverse rotation of the rotating cam 36e is prevented, and the so-called mechanical lock state is established. Since transmission system II of is overloaded, the overload clutch 50
And the power is cut off, and damage to the planting device C is prevented.

Further, the overload clutch 50 has the inclined surface 50c on the forward rotation direction side.
The inclined surface 50d on the reverse rotation side is formed to be a gentle inclined surface so that the clutch can be disengaged with a lighter load when the shaft 24 rotates in the reverse direction than when the shaft 24 rotates in the normal direction. (At the time of shipping the rice transplanter from the factory, the overload clutch 50 cannot be habituated against this overload in the reverse rotation direction, so it is set to be disengaged with a small overload.) It is possible to properly prevent an overload state that occurs when such a body moves backward.

[Brief description of drawings]

1 is a side view, FIG. 2 is a plan view, FIG. 3 is a side sectional view of an essential part, and FIG. 4 is a riding type rice transplanter according to an embodiment of the present invention. Is a plan sectional view of the main part, FIG. 5 is a transmission mechanism diagram, FIG. 6 is a perspective view of the main part, FIG. 7 is a plan view of the main part, FIG. 8 is a cross-sectional view of the main part, and FIG. It is a partial cross section side view of a planting implement. In the figure, reference numeral 1 is a main mission case, 2 is a connecting frame, and 3 is a connecting frame.
Is a vertical frame, 4 is a rear wheel (wheel), 5 is a rear axle case, 6 is a front wheel (wheel), 7 is a front axle case,
8 is a steering wheel, 9 is a handle support frame, 10 is an engine base, 11 is an engine, 12 is an engine cover, 13 is a cockpit,
14 is an output shaft, 15 is a driving pulley, 16 is a hydraulic pump, 17 is an input pulley, 18 and 24 are shafts, 19 and 21 are pulleys, 20 is an input shaft, 22
Is a belt, 23 is a transmission shaft, 25 is a clutch case, and 26 is a PTO.
A shaft, 27 is a step, 27a is a fender, 27b is an auxiliary step, 50 is an overload clutch, A is a tow vehicle, B is a lifting link mechanism, and C is a planting device.

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. In a rice transplanter in which the power of a prime mover 11 is branched from a transmission system I for transmitting to wheels 4 and 6 and the power is transmitted to a planting device C, a normal rotation is made to a transmission system II for the planting device C. A rice transplanter characterized by being provided with an overload clutch 50 configured so that power is disconnected by overload in both the forward and reverse directions.