JPH04278007A - Device for operating clutch of walking-type farm working machine - Google Patents

Abstract

PURPOSE:To lessen the clutch operation load by placing a specific interlock- restriction mechanism on an interlocking path between a side clutch lever and a side clutch shifter of a friction clutch. CONSTITUTION:When a shifter arm working cam 59 is rotated by a range A1 through a wire 40 by gripping a side clutch lever, a roller 56a rolls along the cam face and a side clutch shifter 54 is rotated by the rotation of a shifter arm 56 to disengage the clutch. Even if the side clutch lever is further gripped to rotate the working cam 59 by a range A2, there is no rotation of the shifter arm 56 and the increase of the lever operation load because the radius R2 to the rotational center of the cam is constant in the range A2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a clutch operating device for a walking agricultural machine.

0002

BACKGROUND ART Conventionally, in a walk-behind agricultural machine, in which running wheels that are driven and rotated by the rotational power of an engine being transmitted are provided on the left and right sides of the machine body, and a handle is provided at the rear of the machine body, power is transmitted from the engine to the running wheels. There was one in which the side clutch device provided in the path was comprised of a claw-type or ball-type clutch. The operating device for operating the clutch on/off of the side clutch device is generally a grip-type lever device attached to the left and right grips of the handle.

0003

[Problems to be Solved by the Invention] When the conventional side clutch device is composed of a pawl type or ball type clutch, when the side clutch device is operated to engage and disengage the clutch using a grip-type lever, the lever is moved to a predetermined position. If the lever is gripped beyond the lever position, the clutch is disengaged and the lever operation load becomes lighter.

However, when the side clutch device is configured with a friction clutch, in order to disengage the friction clutch, the clutch discs of the friction clutch have to move from a transmission state in which they are pressed together by a spring to resist the pressing force by the spring. the clutch discs must be moved apart from each other. Therefore, when the clutch is disengaged using a grip-type lever device, the lever operation load does not become lighter from a predetermined lever position or higher as in the conventional case, but rather the lever load becomes heavier as the lever is gripped. Therefore, when the side clutch device of the friction clutch is operated with a grip-type lever, the clutch operation using the lever is a heavy burden. In particular, since a walking agricultural machine works while traveling back and forth, the side clutch must be operated every time it turns, and if the lever operation load for clutch operation is heavy, the burden is significant.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides traveling wheels 10, 10 on the left and right sides of the fuselage, which are driven and rotated by the rotational power of the engine E.
A side clutch device 4 comprising a friction clutch in a transmission path from the engine E to the running wheels 10, 10 in a walking agricultural machine having a handle 5 at the rear of the machine body.
1 and 41, and grip-type side clutch levers 39 and 39 are provided on the handle 5 to operate side clutch shifters 54 and 54 that actuate clutch engagement and disengagement of the side clutch devices 41 and 41, and the side clutch levers 39 and 39 and the side clutch shifter 54, 54
Walk characterized in that the interlocking path is provided with interlocking limiting mechanisms 57, 57 that prevent the side clutch shifters 54, 54 from moving even if the side clutch levers 39, 39 are operated beyond a predetermined lever position. It was used as a clutch operating device for agricultural machinery.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. Reference numeral 1 in the figure is a traveling transmission case, to which an engine E is fixedly connected to the front part, and to the rear side surface thereof, the front end of a cylindrical frame 2 extending rearward is fixedly fixed. The front side of a planting transmission case 3 is fixed to the rear end of the frame 2, and the front end of a handle support frame 4, which extends rearward and obliquely upward, is fixed to the rear side of the planting transmission case 3. . The base of the operating handle 5 is attached to the upper end of the handle support frame 4.

A seedling planting tool 6 for four rows is attached to the planting transmission case 2 with a rotating crank and a swinging arm, and the seedlings are separated and held one by one from the seedling stand 7 and transferred to the field. It works like planting. In addition, a seedling mounting stand 7 is connected to both ends of a reciprocating rod 8 which protrudes left and right from the planting transmission case 2 and moves back and forth left and right, with connecting members 9, and the seedling mounting tool 6
The seedling platform 7 reciprocates left and right in accordance with the planting operation. The seedling stand 7 has an upper support 7a fixed to the upper part of the handle support frame 4, and a seedling support frame 7c having an L-shape in side view for receiving the lower side of the seedlings placed on the seedling stand 50. It is supported by an integrally formed lower support 7b so as to be slidable left and right. The seedling support frame 7c is provided with a seedling dividing opening 7c' through which the seedling separation body of the seedling planting tool 6 passes.

Reference numerals 10 and 10 denote a pair of wheels provided on the left and right sides. These wheels 10, 10 have a boss 11 that wraps around a travel drive shaft 42 that protrudes on both left and right sides of the travel transmission case 1.
, 11 is pivotally supported at the rear ends of transmission chain cases 12, 12, and is provided so as to be swingable up and down while being rotated by transmission. Reference numerals 13 and 13 designate arms that are integrally fixed to bosses 11 and 11 that are integral with the transmission chain cases 12 and 12, respectively.

Reference numeral 14 is a hydraulic cylinder that moves the wheels 10, 10 up and down. The base of this hydraulic cylinder 14 is connected to a hydraulic case 15 fixed on the traveling transmission case 1.
The rear end of the piston 14a of the hydraulic cylinder 14 is rotatably pivoted around a vertical axis 17 at the left and right center portions of a balance device 16 whose front ends are connected to the upper ends of the arms 13, 13. , the wheels 10, 10 are configured to move up and down in a contradictory manner.

The balance device 16 includes a balance body 18 whose left and right center portions are rotatably supported by a vertical shaft 17 at the tip of a piston 14a, and vertical shafts 19, 1 on both left and right sides of the balance body 18.
It is composed of connecting rods 20, 20 rotatably connected at 9. The right connecting rod 20 is rotatably connected directly to the right arm 13, but the left connecting rod 20 is provided with a hydraulic cylinder 21 for rolling operation in the middle of the piston 21a. It is configured such that the connection length can be changed by moving in and out of the hydraulic cylinder 21.

Reference numeral 22 denotes a central leveling float attached to the lower center of the fuselage, and 23a and 23b are left and right leveling floats installed on both left and right sides of the float, each with its rear end connected to a support shaft 24...
The front part is connected by a floating connecting member 25 having a long hole 25a, and is supported to be able to swing up and down within a swinging range h. The central ground leveling float 22 also operates as a sensor float of a lifting control means that lifts and lowers the pair of left and right wheels 10, 10 to maintain a constant height of the aircraft from the ground. That is, the lever 26a for switching the spool of the lift control hydraulic valve 26 provided in the hydraulic case 15 and the front upper surface of the central leveling float 22 are connected to the rod 2.
They are connected at 7. When the front part of the central grading float (sensor float) 22 moves upward beyond the proper range, the hydraulic valve 26 transfers the pressure oil pumped out from inside the traveling transmission case 1 by the hydraulic pump 28 into the hydraulic cylinder 14 into the piston 14a. The piston 14a is pushed out, and the left and right arms 13, 13 are pulled rearward via the connecting rods 20, 20 without the balance body 18 tilting, and the transmission chain cases 12, 12 are As it rotates, the left and right wheels 10, 10 attempt to descend to the same height at the same time, and the aircraft relatively rises by that amount. On the other hand, when the front part of the central leveling float 22 moves down beyond the proper range, the hydraulic valve 26 switches to feed pressure oil into the hydraulic cylinder 14 so that the piston 14a is retracted, and the piston 14a is retracted and the balance is removed. When the body 18 is not tilted, the connecting rods 20, 20
The left and right arms 13, 13 are returned to the front via the
0 will rise to the same height at the same time and the aircraft will descend accordingly.

Reference numeral 29 is a horizontal sensor that detects the horizontal inclination of the aircraft body with respect to the horizontal plane. In this sensor 29, the upper end of a swinging arm 29b having a weight 29a fixed to its lower end is swingably suspended from a pivot shaft in the front-rear direction, and the swinging arm 29b moves left and right as the aircraft tilts left and right. It is a pendulum type sensor configured to be able to swing. This horizontal sensor 29
The middle part of the swinging arm 29b and the tip of the spool of the rolling control hydraulic valve 30 are connected by a pivot pin, and the spool of the rolling control hydraulic valve 30 is switched by the left and right swinging of the swinging arm 29b. It is configured so that When the aircraft is tilted so that the left side is lower and the right side is higher with respect to the horizontal plane, the spool is pushed by the swing arm 29b, and the hydraulic valve 30 is connected to the rolling hydraulic cylinder 2.
The piston 21a of No. 1 switches to retract, the connection length between the left balance body 18 and the arm 13 becomes shorter, the left wheel 10 moves downward, and the lowered left side rises, making the aircraft horizontal horizontally. Return. Conversely, when the aircraft tilts so that the right side is lower and the left side is higher, the spool is pulled by the swing arm 29b, the hydraulic valve 30 is switched so that the piston 21a of the rolling hydraulic cylinder 21 protrudes, and the left balance body is 18 and the arm 13 becomes longer, the left wheel 10 moves upward, the raised left side descends, and the aircraft returns to the left-right horizontal state.

Reference numeral 31 denotes a transmission shaft, which is provided to transmit power from the traveling transmission case 1 to the planting transmission case 3. 32 is the main gear shift lever, which controls road speed, reverse,
Can shift between neutral and working speed. 33 is a main clutch lever, and 34 is a clutch lever for lifting and lowering the aircraft and for planting. 3
5 is a recoil knob for starting the engine, 36 is a spare seedling stand, 37 is a bonnet that covers the top of the aircraft, and 38 is a bumper.
It is also a stand device.

Reference numerals 39 and 39 denote side clutch levers, which are used to engage and disengage the left and right side clutch devices 41, 41, which will be described later, respectively. The lever support members 39a, 39a of the respective levers 39, 39 are attached to the frame portions near the left and right grips 5a, 5a of the handle 5 with attachment fittings 39b, 39b, and the lever support members 39a, 39a are attached to the frame portions near the left and right grips 5a, 5a, and the lever support members 39a, 39a are attached to the frame portions near the left and right grips 5a, 5a. member 39c,
39c is rotatably attached with pins 39d, 39d,
Then, the inner wires 40a, 40a of the wire 40 are connected to the lever operating members 39c, 39c, and the lever supporting member 39
The outer wires 40b, 40b of the wire 40 are connected to the wires 40a, 39a. In this way, the side clutch levers 39, 39 have a grip-type lever configuration, and when the operator is operating the aircraft while gripping the grips 5a, 5a of the handle 5 with both hands, the side clutch levers 39, 39 can be used to control the left and right side clutch levers. 41, the operator operates the lever by placing his/her hands on the grips 5a, 5a of the handle 5 and gripping the left and right lever operating members 39c with his or her fingers.

Reference numerals 41 and 41 denote side clutch devices, which are assembled to both left and right ends of a uniaxial traveling drive shaft 42 protruding from the left and right sides of the traveling transmission case 1, and
, 10 are protruded to the left and right outside of the swing rotation center side of the chain cases 12, 12 which pivotally support the chain cases 12, 10. The side clutch devices 41, 41 protrude from the wheels 10, 10.
Since there is a sufficient distance from the outer periphery, there will be no interference. In addition, these protruding side clutch devices 41, 4
1, pipe materials 25'a and 25"a are disposed in front of it to support the front parts of left and right leveling floats 23a and 23b,
Moreover, the pipe materials 25'a, 25''a protrude outward from the left and right positions of the side clutch devices 41, 41,
Because it is hardwired, there is less worry about damage due to collisions. Also, the side clutch devices 41, 41 are connected to the chain case 1.
2 and 12, it is difficult for powder etc. from the clutch discs of the side clutches (driving discs 44 and driven discs 46 to be described later) to enter the transmission oil which also serves as hydraulic oil. This prevents dirt from clogging the hydraulic system.

41a, 41a are chain cases 12, 1
2. It is a removable cover. Side clutch device 41
, 41 are configured as follows. That is, both left and right ends of the running drive shaft 42 are formed into square shafts, and drive disk rotating shafts 43, 43 each having a square hole are fitted therein and attached so as to rotate together. A plurality of left and right drive disks 44 are attached to the drive disk rotating shaft 43 so as to rotate together. A driven disk rotating tube 45 is attached so as to surround the outer periphery of the driving disks 44 in the rotational direction, and the driven disks 46 are attached to the rotating tube 45 so as to rotate together with the driven disks 46. In addition, the driven disk rotating cylinder 45
is integral with a drive sprocket 45a, and the sprocket 45a is freely rotatably and slidably assembled to the running drive shaft 42, and the driven disk rotating cylinder 45 is supported pivotally. A ring-shaped disc spring 47 is incorporated inside the driven disk rotating cylinder 45, and the driving disks 44 and driven disks 46 are assembled so as to overlap every other disk.
...and are assembled in pressure contact with each other. A bearing 48 is incorporated between the disk spring 47 and the drive disk 44, which are in pressure contact with the inside of the driven disk rotating cylinder 45, to smooth the differential movement therebetween.

The side clutch devices 41, 41 of the above example are as follows:
The driving disk 44... and the driven disk 46... are the disc springs 4.
Since the disks are assembled in pressure contact with each other by the disks 7, the mutual disks rotate together due to the contact friction. This state is the "on" state of the side clutch devices 41, 41. Therefore, at this time, the rotation of the traveling drive shaft 42 is transmitted to the drive sprockets 45a, 45a, and from the drive sprockets 45a, 45a, the inside of the chain cases 12, 12 is transmitted through the chains 49, 49 to the reduction sprockets 50, 50.
to the axles 53, 5 through the chains 51, 51.
The running wheels 10, 10 are rotated by transmission to the wheel drive sprockets 52, 52, which are integral with the wheel drive sprockets 3. By the way, the reduction sprocket 50 is provided to reduce the reduction ratio in the chain case from the drive sprocket 45a to the axle 53 to 1/3 to 1.
/4, which is a large value. This is because the side clutch devices 41, 41 have a friction clutch configuration, so that they can be operated even when the clutch drive side rotates at high speed. On the other hand, in conventional claw clutches and ball clutches, when the clutch drive side rotates at high speed, the clutch does not jump when engaged, and the return operation to the transmission state is not performed well.

Now, the pressure contact between the drive disks 44 and the driven disks 46 is released, and the contact friction between the two disks becomes lower than the frictional force that allows them to rotate together, and the driven disks 46 stop rotating. Then, the side clutch device 41 becomes in the "off" state, and the transmission rotation of the traveling wheels 10 is stopped. Switching to this state is performed by sliding the drive sprocket 45a in the left-right outward direction by 1 to 2 mm using the side clutch shifter 54 against the disk springs 47. In conventional pawl clutches and ball clutches, the switching stroke was as long as 4 to 5 mm, but by adopting a friction type clutch configuration, the operating stroke was shortened.

Note that without operating the side clutch shifter 54 until the clutch is completely disengaged, the driven disc 46...
It can also be used in a so-called half-clutch state, in which the clutch rotates while slipping with respect to the drive disks 44. The side clutch shifters 54, 54 are attached so as to rotate integrally with shifter shafts 55, 55 which are rotatably supported by the chain cases 12, 12, respectively, and the side clutch shifters 54, 54 are attached to portions of the shafts 55, 55 that protrude outside the chain case. Shifter arms 56, 56 are each integrally attached. The side clutch shifters 54, 54 are operated by the wire 40 by operating the side clutch levers 39, 39.
, 40, which will be described later, are interlocked, and the shifter arms 56, 56 are actuated and operated via the interlock restriction mechanisms 57, 57.

The structure of the interlocking restriction mechanisms 57, 57 is as follows. That is, the shifter arm operating cams 59, 5 are connected to the camshafts 58, 58 fixed to the chain cases 12, 12.
The cam cylinders 59a, 59a to which 9 are fixed are rotatably mounted, and the shifter arm actuating cams 59, 59 have rollers rotatably attached to the free ends of the shifter arms 56, 56.
56a and 56a are in contact with each other. The shifter arm operating cams 59, 59 are provided with the side clutch lever 39.
, 39, an inner wire 40a of the wire 40, 40,
40a are connected. Further, the cam cylinders 59a, 59
Arms 59b, 59b are fixed to a.
Springs 60, 60 are hung on spring support pieces 60a, 60a fixed to chain cases 12, 12 and 9b, 59b.

The cam shapes of the shifter arm actuating cams 59, 59 of the interlocking limiting mechanisms 57, 57 in plan view are an arc (rotation It has a curved shape that connects the range A0), an arc of radius R2 (rotation range A2), and a curve connecting it (rotation range A1). Therefore, when one or both of the left and right side clutch levers 39 on the handlebar 5 side are gripped and operated, when the lever operating member 39c rotates within the rotation range A'1, the shifter arm is The operating cam 59 rotates around the cam shaft 58 by a range A1, the roller 56a rolls along the cam surface, and the shifter arm 56 rotates.
In conjunction with this, the side clutch shifter 54 rotates by a stroke necessary to interrupt the transmission state of the side clutch 41 to disengage the clutch. Then, when the side clutch lever 39 is further squeezed and operated and the lever operating member 39c is further rotated within the rotation range A'2, the shifter arm operating cam 59 is moved to the camshaft 58 via the wire 40.
It rotates by range A2. Since this range A2 is a constant radius R2 with respect to the cam rotation center, the shifter arm 56 does not rotate even if the roller 56a rolls along this cam surface. Therefore, when the side clutch lever 39 is operated within this range A'2, the lever operation load does not increase.

The power transmission path from the engine E to the wheels 10, 10 is as shown in FIG. That is, the output shaft of the engine E is fitted into the input gear 61 in the traveling section transmission case 1, and power is input thereto. input gear 61
The rotational power is transmitted via a reduction gear 62 to a transmission gear 64 freely rotatable on a transmission shaft 63, and then through a pawl type main clutch 65 to traveling speed gears 66a, 66b which rotate integrally with the transmission shaft 63. and gears 67a, 67b, 67 between planted plants
The power is transmitted to c. Traveling speed gear (forward 2nd speed) 66a, 66
b, or a transmission gear 69 freely rotatably assembled on the inter-stock switching shaft 68 and a back gear (reverse 1st speed), and a transmission shaft 70.
The upper transmission gear 71 is selectively engaged to change the speed, and the transmission is transmitted via a transmission gear 72 to a traveling gear 73 that is assembled to rotate integrally with the traveling drive shaft 42 . Further, the inter-plant switching gear 74, which is fitted into a spline groove on the inter-plant switching shaft 68 and is slidable in the axial direction, meshes with the planting inter-plant gear 67a or 67b, or the transmission gear 69 and the claws are engaged with each other. The speed is reduced by meshing, and the power is transmitted to the transmission shaft 31 to the planting section via bevel gears 75 and 76. 77
is a shifter that turns the main clutch 95 on and off.

By the way, since the side clutch devices 41, 41 are configured with friction clutches as described above, the clutch operation stroke can be shortened, as shown in FIG. 9.
The shifter arms 56', 56', which are integrally attached to the shifter shafts 55, 55, can be made longer, and the lever operation load of the clutch disengagement operation of the side clutch levers 39, 39 can be greatly reduced.

[0024]

[Operation and effect of the invention] Grip-type side clutch lever 39
, 39 and friction clutch configuration side clutch devices 41, 4
Interlocking restriction mechanisms 57, 57 are provided in the interlocking path of the side clutch shifters 54, 54 of No. 1 to prevent the side clutch shifters from moving even if the side clutch levers 39, 39 are operated beyond a predetermined lever position. It becomes possible to operate with the minimum lever operation load necessary for the cutting operation, and the burden of clutch operation is reduced. In particular, walk-behind agricultural machines work while traveling back and forth, so the side clutch must be operated each time it turns.
The effect of reducing the burden of lever operation for clutch operation is significant.

[Brief explanation of the drawing]

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

FIG. 2 is a plan view of the walking rice transplanter.

FIG. 3 is a hydraulic circuit diagram showing an elevation control mechanism.

FIG. 4 is a cross-sectional view showing a conduction mechanism.

FIG. 5 is a sectional view showing a transmission mechanism within the chain case.

FIG. 6 is a side view showing the side clutch lever.

FIG. 7 is a cross-sectional plan view showing essential parts of the embodiment.

FIG. 8 is a cross-sectional side view showing essential parts of the embodiment.

FIG. 9 is a cross-sectional plan view showing another operating mechanism of the side clutch device.

[Explanation of symbols]

E: Engine 5: Handle 10, 10: Running wheels 39, 39: Side clutch lever 41, 41: Side clutch device 54, 54: Side clutch shifter 57, 57: Interlocking restriction mechanism

Claims (1)

[Claims] 1. A walk-behind agricultural machine, in which running wheels 10, 10 driven and rotated by transmission of the rotational power of an engine E are provided on the left and right sides of the machine body, and a handle 5 is provided at the rear of the machine body, in which the running wheels 10, 10 are provided from the engine E to the running wheels. A side clutch device 41 configured with a friction clutch in the transmission path to the wheels 10, 10.
. An interlocking restriction mechanism 5 is provided in the interlocking path of the side clutch shifters 54, 54 to prevent the side clutch shifters 54, 54 from moving even if the side clutch levers 39, 39 are operated beyond a predetermined lever position.
7, 57. A clutch operation device for a walking agricultural machine, characterized in that a clutch operation device for a walking agricultural machine is provided.