JP4728587B2 - Pedal operation structure for riding mower - Google Patents

Description

The present invention is equipped with the engine above the front portion of the pair of left and right body frame supporting a front wheel and a rear wheel, connecting the mower vertically movably between the front and rear wheels, a rear transmission portion provided in the aft body It is related with the pedal operation structure of the riding-type mowing machine comprised so that it may operate by the speed change pedal and brake pedal which provided the speed change operation part and the brake operation part of this body front part.

  In a riding mower with a mower connected between the front and rear wheels so as to be able to move up and down, the mower does not come into contact with the ridges on the ground when the mower is lifted to move. It is desirable to increase the mower's ascent limit so that no member hindering the mower's ascent is located below.

For example, in a pair of left and right body frames, a pedal is provided outside one lateral side of the front part, and a pedal that interlocks and connects an operation part and a pedal installed on the other lateral side of the rear transmission part via a link mechanism In the operation structure, it is necessary to arrange the link mechanism so as not to prevent the mower from rising. Therefore, as disclosed in Patent Document 1, an intermediate operation shaft extending from side to side is provided behind the rear transmission unit. It has been proposed that one end of the intermediate operating shaft and the pedal are linked and the other end of the intermediate operating shaft and the operating portion of the rear transmission portion are linked.
Japanese Patent Laid-Open No. 11-48812

  According to the pedal operation structure disclosed above, there is no member such as an intermediate operation shaft extending right and left in the ascending space of the mower, which is effective for greatly raising the mower. Since the link mechanism is arranged around the rear, the distance between the intermediate operation shaft and the pedal becomes large, and the linkage member linked to the intermediate operation shaft and the pedal becomes longer, increasing the weight of the parts. The cost was increased. In addition, since the entire intermediate operation shaft is greatly exposed at the rear end of the airframe, there is a possibility that it may be deformed or damaged by contact with an obstacle on the ground.

  The present invention has been made paying attention to such points, and the link mechanism for interlockingly connecting the pedal at the front of the aircraft and the operation unit at the rear of the aircraft is configured to be short in the front and rear, thereby reducing the weight and cost of the parts. The main object of the present invention is to provide a pedal operation structure that can be reduced and prevent the link mechanism from being damaged by contact with an obstacle on the ground.

A first aspect of the present invention is equipped with an engine above the front portion of the pair of left and right body frame supporting a front wheel and a rear wheel, connecting the mower vertically movably between the front and rear wheels, provided in the aft body rear In the pedal operation structure of a riding-type mower configured to operate the transmission operation unit and the braking operation unit of the transmission unit with a transmission pedal and a brake pedal provided at the front of the body,
Formed in the front and rear intermediate part of the right side fuselage frame is a right side bent part that is bent so that the front side is inward of the rear side . Deploy the shift pedal and the brake pedal side by side on the outside,
Two operations that are turned by the depression of the shift pedal and the brake pedal are formed in the front part of the left fuselage frame so that the left side bent part is bent so that the front side is inward of the rear side. The shaft is horizontally supported horizontally on the front side of the right side bent part in the front part of the right side body frame and on the rear side of the left side bent part in the front part of the left side body frame ,
The shift pedal and the brake pedal are connected to the right end portion of the two operation shafts, and in the front-rear direction along the left body frame at a position near the left end portion of the two operation shafts. The front end portions of the two link mechanisms arranged in the above are interlocked and connected, and the rear end portions of the two link mechanisms are interlocked and connected to the speed change operation portion and the brake operation portion of the rear transmission portion.

According to the above configuration, the operation mechanism that crosses the fuselage frame, the link mechanism that interlocks and connects the position near the left end of the operation shaft, the speed change operation unit, and the brake operation unit are set to positions that do not interfere with the lifting and lowering of the mower. Can be deployed. In addition, the link mechanism is arranged at the shortest distance between the position near the left end of the operation shaft and the speed change operation unit and the brake operation unit or a distance close thereto. In addition, since the link mechanism is arranged along the airframe frame without being greatly exposed to the rear of the airframe above the mower, there is almost no possibility that an obstacle on the ground contacts the link mechanism.
Therefore, according to the first invention, the link mechanism for interlockingly connecting the pedal at the front of the fuselage and the speed change operation unit and the brake operation unit of the rear transmission structure is configured to be shortened in the front and rear, thereby reducing the weight and cost of the parts. It is possible to prevent the link mechanism from contacting an obstacle on the ground.

According to a second invention, in the first invention,
The two operation shafts are moved forward and backward so that the operation shaft for the shift pedal of the two operation shafts is positioned in front of the operation shaft for the brake pedal of the two operation shafts. The brake pedal is disposed inside the speed change pedal, and the brake pedal extends forward from the connection point to the brake pedal operation shaft through the lower side of the speed pedal operation shaft. , And extending upward from the extended end portion.

According to a third invention, in the first or second invention,
The rear transmission unit is arranged so as to be biased to the left side with respect to the pair of left and right aircraft frames, and the mowing grass from the mower is placed in the rear portion of the aircraft in the space between the rear transmission unit and the right aircraft frame that are unevenly distributed. It is characterized in that a duct for guiding is inserted and arranged.

According to the above configuration, the duct moves up and down as the mower moves up and down, but the duct is unevenly distributed on the right side of the fuselage, whereas the link mechanism is located on the left side of the fuselage frame. The link mechanism does not interfere with the duct rise.

  Therefore, according to the third aspect of the invention, the ducted mower can be raised sufficiently high.

  FIG. 1 is an overall side view of a riding mower according to the present invention, and FIG. 2 is an overall plan view thereof. This riding-type mower has a front-link 4a and a rear-link 4b at the lower part of a riding-type traveling machine body 3 configured as a four-wheel drive type in which the front wheel 1 to be steered and the rear wheel 2 whose orientation is fixed are respectively driven. The mower 5 is suspended and connected through the four-link mechanism 4 so as to be movable up and down, and the grass collected by the mower 5 is conveyed to the rear of the machine via the duct 6 and connected to the rear of the machine. 7 to collect.

  A body frame 8 made of a pair of left and right vertical plates is provided in the lower part of the traveling vehicle body 3 in the front and rear direction. A front axle case 9 is mounted on the lower side of the front part of the body frame 8 so as to be capable of rolling. The front wheels 1 mounted on the left and right ends of the axle case 9 are steered by a steering cylinder 10 mounted on the front axle case 9. In addition, a water-cooled engine 12 equipped with a radiator 11 at the rear is mounted and supported above the front part of the body frame 8, and a front cover 13 and a bonnet 14 are provided to cover them. A transmission case 15 forming a part of the rear transmission unit 40 is connected to the rear portion, and the rear wheel 2 is pivotally supported on the left and right sides of the transmission case 15. Further, a step 16 is mounted and supported on the upper part of the body frame 8, and a driver seat 17 is disposed between the left and right rear wheel fender portions 16 a provided continuously to the rear portion of the step 16.

  As shown in FIG. 2, the front portion of the step 16 extends forward so as to wrap around the left and right sides of the base portion of the front cover 13, and an easy posture in which an operator sitting on the driver seat 17 extends both feet. The left and right feet are spaced forward so that the vehicle can be driven at the same time, and a traveling speed change pedal 18 that performs forward / reverse switching and continuously variable transmission and a travel stop brake pedal 19 are provided at the right front portion of step 16. Is deployed.

  FIG. 3 shows an outline of the transmission system. As shown in the figure, the power output from the engine 12 is transmitted from the front to the input shaft 22 of the transmission case 15 via the transmission shaft 21, and is branched into a traveling system and a working system in the case. Connected to the rear surface of the transmission case 15 is a hydraulic continuously variable transmission (HST) 23 that constitutes a part of the rear transmission unit 40 and can be switched between forward and backward. The input shaft 22 is connected to the continuously variable transmission. It is butt-connected to 23 input pump shafts 23a. The power input to the continuously variable transmission 23 is continuously variable for forward or reverse movement and output from the output motor shaft 23b. The output gear G1, gear G2, bevel gears G3 and G4, and gears G5 and G6 are output. Is converted into rotational power of a lateral axis and transmitted to the horizontally long rear wheel drive shaft 24, and then distributed from the rear wheel drive shaft 24 to the left and right rear wheels 2 via the left and right side clutches 61 (see FIG. 5). It has come to be. Further, the transmission power extracted from the output motor shaft 23b of the continuously variable transmission 23 is transmitted to the front wheel drive shaft 25 via the output gear G9 and the gear G10, and the power extracted from the front wheel drive shaft 25 to the front of the case. Is transmitted to the differential mechanism 28 of the front axle case 9 via transmission shafts 26, 27 extending forward along the lower part of the vehicle body so that the front wheel 1 is driven at a speed synchronized with the rear wheel 2. It has become.

  As shown in FIG. 5, the left and right side clutches 61 are linked to the knuckle arms 62 of the left and right front wheels 1 via operation wires 63, respectively, and the steering handle 64 is rotated to the right or left. When the front wheel 1 is steered beyond the set angle, the side clutch 61 of the rear wheel 2 that is on the inside of the turn is automatically operated in conjunction with this, and the left and right front wheels 1 and the rear wheel 2 on the outside of the turn are connected. The three-wheel drive allows the aircraft to turn slightly.

  The continuously variable transmission 23 includes an axial plunger type variable displacement pump 23P driven by the input motor shaft 23a, an axial plunger type fixed displacement motor 23M that outputs shifting power from the output motor shaft 23b, and the like. Is incorporated, and an always-driven input motor shaft 23a is protruded rearward. A cooling fan 29 for the continuously variable transmission 23 is attached to the protruding end, and an output is provided at the rear of the continuously variable transmission 23. A traveling brake 30 comprising an inwardly expanding friction brake is provided so as to act on the motor shaft 23b, and a braking operation shaft (braking operation portion) 35 of the traveling brake 30 is linked to the brake pedal 19 as described later. ing.

  Further, a speed change operation shaft (speed change operation portion) 36 for changing the rotation speed and direction of the output motor shaft 23b by changing the swash plate angle of the variable displacement pump 23P is provided on the left side of the continuously variable transmission 23. The speed change operation shaft 36 is linked to the speed change pedal 18 as will be described later.

  Further, a part of the power transmitted to the input shaft 22 is taken out as working system power by the gear G11, transmitted to the PTO clutch 31 via the gears G12 and G13, and then projected on the front surface of the case 32. And is transmitted to the input case 34 provided on the upper surface of the deck of the mower 5 through the transmission shaft 33. Further, a part of the power transmitted to the input shaft 22 is transmitted upward via gears G14 and G15, and serves as a hydraulic source for moving up and down the mower, for power steering, and for charging the continuously variable transmission 23. The hydraulic pump P is driven.

  Next, the linkage structure between the shift pedal 18 and the continuously variable transmission 23 and the linkage structure between the brake pedal 19 and the traveling brake 30 will be described.

As shown in FIG. 6, two operation shafts 37 and 38 are horizontally mounted on the front portion of the body frame 8 in front of the input case 34 of the mower 5 and are horizontally supported. The shift pedal 18 is connected to the right outer end portion of the operation shaft 37, and the brake pedal 19 is connected to the right outer end portion of the other operation shaft 38. The speed change operation shaft 36 of the device 23 is interlocked and connected via a link mechanism 41, and the left end of the operation shaft 38 and the braking operation shaft 35 of the traveling brake 30 are interlocked and connected via a link mechanism 42. As shown in FIG. 6, a right bent portion 8 </ b> A is formed at the front and rear intermediate portion of the right aircraft frame 8, and a left bent portion 8 </ b> B is formed at the front portion of the left aircraft frame 8.

  As shown in FIG. 7, the link mechanism 41 of the speed change operation system adjusts the advancement over the operation arm 43 connected near the left end of the operation shaft 37 and the speed change arm 44 connected to the outer end of the speed change operation shaft 36. The rod 45 is constructed so that the speed change operation shaft 36 is moved forward and forward when the speed change pedal 18 is stepped forward, and the speed change operation shaft 36 is moved backward when the speed change pedal 18 is stepped backward. When the pedal is depressed, the speed change pedal 18 is automatically returned to the neutral position by the neutral restoring force of the speed change operation shaft 36 and the neutral return mechanism 46 provided on the side of the case. It is like that.

  The neutral return mechanism 46 includes a recessed cam 47 formed on the transmission arm 44, a pressing roller 48 pressed against the recessed cam 47, a roller support arm 49, and a pressing spring 50. The fulcrum position of the roller support arm 49 is adjusted by the rotation of the eccentric fulcrum shaft 51 so that the speed change operation shaft 36 is neutral when the pressing roller 48 is pressed against the valley of the recessed cam 47.

  As shown in FIG. 6, the link mechanism 42 of the brake operation system includes an operation arm 52 connected near the left end of the operation shaft 38 and a brake arm 53 connected to the brake operation shaft 35. It is structured to be interlocked and connected via a moving link 55 and an operation rod 56, and the brake pedal 19 is stepped against a return spring (not shown) and the rod 54 is pulled forward, so that intermediate rotation is achieved. The link 55 is rotated clockwise in FIG. 6 so that the braking operation shaft 35 is rotated in the braking direction. The rod 54 is provided with a spring 58 that is initially compressed, and when the intermediate rotation link 55 is rotated via the spring 58, the amount of depression of the brake pedal 19 is reduced. As the pressure increases, the spring pressure increases, and the braking force increases accordingly.

  [Another Example]

  (1) In the above embodiment, the speed change operation shaft 37 to which the speed change pedal 18 is connected and the brake operation shaft 38 to which the brake pedal 19 is connected are arranged in parallel in the front and rear. It is also possible to carry out the operation by inserting an operating shaft 38 of the braking system into the cylinder shaft 37.

Overall side view of riding mower Overall plan view of a riding mower Schematic diagram of transmission system Side view with part of the rear transmission cut out Plan view of traveling structure Top view of pedal operation structure Side view of speed change operation structure

1 Front wheel 2 Rear wheel 5 Moore 6 Duct 8 Airframe frame
8A right side bend
8B Left side bend
12 Engine 18 Shift pedal 19 Brake pedal 35 Braking operation part (braking operation shaft)
36 Shifting operation part (shifting operation shaft)
37 Operation shaft (operation shaft for shift pedal)
38 Operation axis (operation axis for brake pedal)
40 Rear transmission part 41 Link mechanism 42 Link mechanism

Claims (3)

An engine mounted above the front portion of the pair of left and right body frame supporting a front wheel and a rear wheel, connecting the mower vertically movably between the front and rear wheels, the speed change operation of the rear transmission portion provided in the aft body And a pedal operation structure for a riding-type mower configured to operate the brake operation unit with a speed change pedal and a brake pedal provided at the front of the body,
Formed in the front and rear intermediate part of the right side fuselage frame is a right side bent part that is bent so that the front side is inward of the rear side . Deploy the shift pedal and the brake pedal side by side on the outside,
Two operations that are turned by the depression of the shift pedal and the brake pedal are formed in the front part of the left fuselage frame so that the left side bent part is bent so that the front side is inward of the rear side. The shaft is horizontally supported horizontally on the front side of the right side bent part in the front part of the right side body frame and on the rear side of the left side bent part in the front part of the left side body frame ,
The shift pedal and the brake pedal are connected to the right end portion of the two operation shafts, and in the front-rear direction along the left body frame at a position near the left end portion of the two operation shafts. Riding is characterized in that the front end portions of the two link mechanisms arranged in the vehicle are interlocked and the rear end portions of the two link mechanisms are interlocked and connected to the speed change operation unit and the brake operation unit of the rear transmission unit. Pedal mower pedal operation structure.   The two operation shafts are moved forward and backward so that the operation shaft for the shift pedal of the two operation shafts is positioned in front of the operation shaft for the brake pedal of the two operation shafts. The brake pedal is disposed inside the speed change pedal, and the brake pedal extends forward from the connection point to the brake pedal operation shaft through the lower side of the speed pedal operation shaft. The pedal operation structure for a riding type mower according to claim 1, wherein the pedal operation structure extends upward from the extended end portion. The rear transmission unit is arranged so as to be biased to the left side with respect to the pair of left and right aircraft frames, and the mowing grass from the mower is placed in the rear portion of the aircraft in the space between the rear transmission unit and the right aircraft frame that are unevenly distributed. The pedal operation structure for a riding-type mower according to claim 1 or 2, wherein a duct for guiding is inserted and arranged.

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