JPH0450182Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention has a belt-type continuously variable transmission connected and arranged between the engine installed at the front of the aircraft and the transmission case installed at the rear of the aircraft. The present invention relates to an agricultural working machine in which a speed change pedal for operating the continuously variable transmission is swingably installed on a deck, and a working device can be disposed between the front and rear wheels below the deck.

[Conventional technology]

For example, as an example of the agricultural machine, a lawn mower is equipped with a mower on the underbelly of the deck of the machine body.
The vehicle speed is adjusted by operating the continuously variable transmission device by swinging the speed change pedal placed on the deck, but if the amount of operation of the speed change pedal is large, it is difficult to operate. A long operating arm extends from the speed change pedal to the lower surface of the deck, and the free end of the operation arm is linked to the continuously variable transmission, thereby reducing the amount of swinging operation of the speed change pedal on the upper surface of the deck. The transmission is operated reliably with a large amount of operation.

[Problem that the invention attempts to solve]

However, with the above configuration in which the operating arm simply extends from the speed change pedal to the bottom surface of the deck, the longer the extending length of the operating arm, the more
The operating distance of the swinging part of the operating arm is longer,
This makes it easier to operate the continuously variable transmission to obtain the desired vehicle speed, but with this configuration, it is necessary to secure a large space on the underside of the deck for operating the operating arm. Lawn mowers that have working devices such as mowers installed on the underside of the deck are taller and larger, leaving room for improvement.

The present invention has been developed by paying attention to the above-mentioned actual situation, and it is possible to operate the continuously variable transmission with good operability with a small amount of rocking operation of the gear change pedal, while the continuously variable transmission is mounted on the underside of the deck. To provide an agricultural working machine in which an operating arm for operating operations does not protrude significantly.

[Means for solving problems]

The characteristic configuration of the agricultural machine according to the present invention is that a swing arm extends from a speed change pedal, and an intermediate arm extends from an operating arm that extends from the bottom surface of the deck and is linked to a continuously variable transmission. The swing axis of the swing arm is separate from the swing axis of the swing arm.
In addition, the swing radius of the intermediate arm is set to be smaller than the swing radius of the swing arm, and the free end side of the intermediate arm and the free end side of the swing arm are set such that the free end side of the intermediate arm and the free end side of the swing arm are The two arms are characterized in that they are interlocked and connected via a linkage mechanism that is flexible enough to allow relative movement of both arms in the longitudinal direction.

[Effect]

When the speed change pedal is operated, the swing arm and the intermediate arm linked to the swing arm begin to swing, and as explained with reference to _FIG . The amount of movement of the free end of the arm 23 is equal to the amount of movement of the free end of the intermediate arm 24 having the pivot axis _X1 . However, when comparing the swing angles of these two arms 23 and 24, the swing radius R of the swing arm 23 is larger than the swing radius r of the intermediate arm 24, so the swing angle of the intermediate arm 24 is This is larger than the swing angle of the movable arm 23. Therefore, the amount of operation of the operation arm 25 connected to the intermediate arm 24 can be increased compared to the amount of swing operation of the speed change pedal 33.

Furthermore, since there is a difference in the swing radii, the free end of the swing arm 23 and the free end of the intermediate arm 24 will move relative to each other in the longitudinal direction of these arms as they move in conjunction with each other. , the flexibility of the linking mechanism A that connects these two allows for smooth relative movement.

[Effect of idea]

To accurately and reliably operate a continuously variable transmission by increasing the amount of operation of a continuously variable transmission while reducing the amount of swing operation of a speed change pedal and improving operability on a deck. In addition, the operating arm does not protrude beyond the bottom surface of the deck, eliminating the need for a large space for operation on the bottom surface of the deck, and preventing interference with the arrangement of work equipment installed on the bottom surface of the deck. Another advantage is that in order to secure a large space, the height of the aircraft does not increase and the size of the aircraft does not increase.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 6 shows a lawn tractor as an example of the agricultural machine of the present invention. This tractor is provided with an engine 2 and a fuel tank 3 in the front hood 1, and has a control handle 4, a driver's seat 5, and a driver's seat 5 at the rear. The vehicle can run while being supported by front and rear wheels 8 and 9 formed with a control section 7 having left and right flat decks 6.
In addition, a mower 10 as a working device is provided at an intermediate position between the front and rear wheels 8, 9, and a grass collection duct 11 and a grass collection container 12 are provided from the mower 10, which are located between the left and right rear wheels 9, 9 and extend rearward. It is composed of

As shown in Figure 4, the main frame 2 of the aircraft
A steering receiver 27 is formed in front of the central portion of the steering wheel 6, and a steering shaft 30 of the control handle 4 and a pinion gear 55 fixed to the steering shaft 30 are mounted on the steering receiver 27.
A sect gear 31 that engages with each other is pivotally supported. A pitaman arm (not shown) is connected to the sect gear 31, and is linked to the front wheels 8 so that the vehicle can run. Since cut grass cut by the mower 10 tends to accumulate on the upper surface of the steering receiver 27, a long brush 39 is provided on the lower surface of the sect gear 31 in the radial direction of the sect gear 31, as shown in FIG. Each time the steering wheel 4 is rotated, the brush 39 sweeps the grass clippings that have accumulated on the steering receiver 27, and the grass is discharged downward from a discharge port 40 formed in the steering receiver 27. It is designed so that it can be dropped into the field.

Next, to explain the transmission system in detail, as shown in FIGS. 2 and 6, the downward output shaft 13 of the engine 2
Output pulleys 14 and 15 are fitted in two stages, upper and lower, and the lower output pulley 15 and the input pulley 16 fitted to the input shaft of the mower 10 are interlocked and connected by a belt 17, forming a working device transmission mechanism. has been done.

On the other hand, an input pulley 54 of a transmission case 19 is interlocked with the upper output pulley 14 via a belt-type continuously variable transmission 18 with belts 21 and 22, and a rear wheel is pivotally supported on the lower end of the transmission case 19. A traveling transmission system is configured to be able to drive 9, 9.

As shown in FIG. 5, a tension pulley type clutch is provided in the middle of the working device system,
By operating a clutch lever 41 swingably provided on the fuselage body, the release wire 20 is pushed and pulled, and the tension arm 42 is operated against a spring 43, so that it can be turned on and off. This clutch lever 41 is pivotally connected to a bracket 44 for holding the release wire 20 fixed to the body, and a safety switch 46 for a starter motor (not shown) is fixed to this bracket 44. When the clutch lever 41 is operated to the OFF position, the swinging piece 45 fixed to the base of the clutch lever 41 moves the safety switch 4
The engine 2 is configured to be driven by pressing the button 6. A stay 47 that holds the release wire 20 is formed by bending the bracket 44, and the safety switch 46 is fixed to the stay 47. It is easy to prepare, and the mounting member can be used for both purposes.

Next, the linkage mechanism between the continuously variable transmission 18 and the speed change pedal 33 that operates the continuously variable transmission 18 will be explained. As shown in FIGS. Boss 48
The rotary shaft 29 is provided to protrude downward from the rotary shaft 29, and the fixed pulley members 49, 50 as a pair of upper and lower outer pulley members are positioned between the two 49, 50 so as to be slidable in the direction of the axis P of the rotary shaft 29. A split pulley is constructed by loosely fitting the inner pulley member 51.
The upper outer pulley member 49 and the inner pulley member 51 form a V-groove space for holding the belt 21 from the engine 2, and the lower outer pulley 5
0 and the inner pulley member 51 form a V-groove space for holding the belt 22 to the mission case 19.

Then, by horizontally swinging the frame 28 around the axis _P2 , the inner pulley member 51 is moved downward, and the upper belt 21 is moved to the small diameter side of the pulley groove. The lower belt 22 can be moved to the larger diameter side, thereby making it possible to increase the speed, and by swinging it in the opposite direction, the belt continuously variable transmission 18 can be configured. has been done.

Next, the operation structure for the continuously variable transmission 18 will be explained. As shown in FIG. A base portion of a speed change pedal 33 is pivotally mounted to be swingable in the front and rear directions. Further, a swing arm 23 extends from the base of the speed change pedal 33 toward the rear of the aircraft body so as to be able to swing together. A boss 37 of the intermediate arm 24 is rotatably connected to a fixed bracket 36 fixed on the deck 6 at a position near where the speed change pedal 33 is installed. A connecting pin 54 fixed to the free end of the swinging arm 23 is fitted into the 52, thereby connecting the free end of the intermediate arm 24 and the free end of the swinging arm 23 to each other. 24 and 23 are interlocked in the rotational direction, and a linkage mechanism A is constructed that is flexibly connected in the longitudinal direction of both arms 24 and 23 to allow relative movement of both arms 24 and 23.

An operating arm 25 is connected to the bottom surface of the deck 6 from the boss 37 of the intermediate arm 24 so as to be able to swing integrally therewith,
The free end of the operating arm 25 is operatively connected to the frame 28 of the continuously variable transmission 18 via a rod 34 of a link mechanism 32. With the above configuration, when the gear shift pedal 33 is depressed and operated, the frame 28
resists the biasing force of the spring 38 and swings horizontally in the speed increasing direction. The swing radius r of the intermediate arm 24 centered on the swing axis _X1 is set smaller than the swing radius R of the swing arm ₂₃ centered on the swing axis X2. Therefore, by operating the speed change pedal 33, the swing angle of the intermediate arm 24 becomes larger than the swing angle of the swing arm 23, and therefore the amount of operation of the operating arm 25 connected to the intermediate arm 24 increases. This means that it is possible to set it to a large value.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an example of the agricultural machine according to the present invention,
Fig. 1 is a side view of the speed change pedal section, Fig. 2 is a plan view of the continuously variable transmission section, Fig. 3 is a side view of the continuously variable transmission section, and Fig. 4 is a sectional view of the steering receiver section.
FIG. 5 is an explanatory diagram of the working device transmission system, and FIG. 6 is an overall side view of the lawn tractor. 2...Engine, 6...Deck, 8...Front wheel, 9...Rear wheel, 10...Working device, 18...
Continuously variable transmission, 19...Mission case, 23
... Swinging arm, 24 ... Intermediate arm, 25 ...
Operating arm, 33...speed change pedal, A...coupling mechanism, _X1 , _X2 ...swing axis.

Claims (1)

[Scope of utility model registration request] A belt-type continuously variable transmission 18 is disposed in conjunction with an engine 2 provided at the front of the aircraft and a transmission case 19 provided at the rear of the aircraft, and the continuously variable transmission 18 is operated on a deck 6. The agricultural working machine is configured such that a pedal 33 is swingably installed and a working device 10 can be disposed between the front and rear wheels 8 and 9 below the deck 6.
A swinging arm 23 extends from the deck 6, and an intermediate arm 24 extends from an operating arm 25 extending from the lower surface of the deck 6 and linked to the continuously variable transmission 18. A swing axis _X2 of the swing arm 23 is provided separately from _X1 ,
and the swing radius of the intermediate arm 24 is set smaller than the swing radius of the swing arm 23, and further,
The free end side of the intermediate arm 24 and the swing arm 2
The free ends of the arms 24 and 23 are interlocked with each other in the rotating direction of the arms 24 and 23, and the arms 24 and
In the longitudinal direction of 23, the agricultural working machine is connected via a linkage mechanism A that has flexibility to allow relative movement of both arms 24, 23.