JP2005297766A - Pedal operation structure for riding type mowing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize light weight and cost reduction by constituting a link mechanism for interlocking/connecting a pedal and an operation part in a short longitudinal direction and to prevent the link mechanism from being contacted with an obstacle or the like on ground in a riding type mowing machine constituted such that an operation part of a rear transmission part provided on a rear part of a machine body for liftably connecting a mower between front and rear wheels is operated by a pedal provided on a front part of the machine body. <P>SOLUTION: The pedals 18, 19 are arranged at an outer side of a lateral one side of front parts in a pair of left and right machine body frames 8 and the operation parts 35, 36 of the rear transmission part 40 and the operation pedals 18, 19 are interlocked/connected through the link mechanisms 41, 42. The operation shafts 37, 38 turned by stepping-in of the pedals 18, 19 are supported at the front part of the machine body frame 8 in the left/right direction. The pedals 18, 19 are provided at an end to the lateral one side of the operation shafts 37, 38 and front ends of the link mechanisms 41, 42 arranged near an end of lateral the other side of the operation shafts 37, 38 along the machine body frame 8 in the longitudinal direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  According to the present invention, a mower is connected to the front wheel and the rear wheel so as to be movable up and down, and an operation unit such as a transmission device and a brake in a rear transmission unit provided at the rear part of the aircraft is operated by a pedal provided at the front part of the aircraft. The present invention relates to a pedal operation structure for a riding type mower.

  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 traveling with the moor raised. 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 on the outer side of one side of the front part, and a pedal that interlocks and connects an operation part and a pedal installed on the other 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 arranged 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.
JP 11-48812 A

  According to the disclosed pedal operation structure, there is no member such as an intermediate operation shaft extending left and right in the ascending space of the mower, which is effective for greatly raising the mower. Since the link mechanism is placed 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 airframe and the operation part at the rear of the airframe is configured to be short in the front and rear to reduce 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 a riding type in which a mower is connected to be movable up and down between a front wheel and a rear wheel, and an operation portion of a rear transmission portion provided at a rear portion of the airframe is operated by a pedal provided at the front portion of the airframe. In the pedal operation structure of the mower,
By placing the pedal on the outer side of one lateral side of the front part of the pair of left and right body frames, and connecting the operating part of the rear transmission part and the operating pedal via a link mechanism, by depressing the pedal The operation shaft to be rotated is supported left and right in the front part of the body frame, and the pedal is provided at one end portion on the lateral side of the operation shaft, and near the end portion on the other lateral side of the operation shaft, A front end portion of the link mechanism provided in the front-rear direction along the body frame is interlocked and connected.

  According to the above configuration, the operating shaft that traverses the fuselage frame, and the link mechanism that interlocks and connects the operating portion near the end of the other side of the operating shaft and the operating portion can be arranged at positions that do not interfere with the lifting and lowering of the mower. it can. In addition, the link mechanism is arranged at a shortest distance between the vicinity of the end portion on the other side of the operation shaft and the operation portion 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 in the front part of the fuselage and the operation part of the rear transmission structure can be configured to be shortened in the front and rear, thereby reducing the weight and cost of the parts. It is possible to avoid the mechanism from contacting an obstacle on the ground.

According to a second invention, in the first invention,
The rear transmission unit is arranged so as to be biased laterally laterally with respect to the aircraft frame, and the mowing grass from the mower is disposed in the space between the unevenly distributed rear transmission unit and the lateral lateral aircraft frame. A duct for guiding to the rear part of the machine body is inserted and arranged.

  According to the above configuration, the duct moves up and down as the mower moves up and down, whereas the duct is unevenly distributed on one side of the fuselage, whereas the link mechanism is on the other side of the fuselage frame. Since it is located, the link mechanism does not interfere with the rise of the duct.

  Therefore, according to the second invention, the above-mentioned effects of the first invention can be brought about, and the mower with a duct 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 on the inside of the turn is automatically turned off in conjunction with this, and the left and right front wheels 1 and the rear wheel 2 on the outside of the turn 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 (operation part) 35 of the traveling brake 30 is linked to the brake pedal 19 as described later. Yes.

  A speed change operation shaft (operation part) 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 pressure 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. 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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 5 Moore 6 Duct 8 Airframe frame 35 Operation part (braking operation shaft)
36 Operation part (speed change operation shaft)
37 Operation shaft 38 Operation shaft 40 Rear transmission section 41 Link mechanism 42 Link mechanism

Claims (2)

In the pedal operation structure of a riding-type mower configured to connect the mower between the front wheel and the rear wheel so as to be movable up and down, and to operate the operation portion of the rear transmission portion provided at the rear portion of the aircraft by a pedal provided at the front portion of the aircraft. ,
By placing the pedal on the outer side of one lateral side of the front part of the pair of left and right body frames, and connecting the operating part of the rear transmission part and the operating pedal via a link mechanism, by depressing the pedal The operation shaft to be rotated is supported left and right in the front part of the body frame, and the pedal is provided at one end portion on the lateral side of the operation shaft, and near the end portion on the other lateral side of the operation shaft, A pedal operation structure for a riding-type mowing machine, wherein a front end portion of the link mechanism arranged in the front-rear direction along the body frame is interlocked.   The rear transmission unit is arranged so as to be biased laterally laterally with respect to the body frame, and the mowing grass from the mower is disposed in a space between the unevenly distributed rear transmission unit and the lateral frame of the lateral side. The pedal operating structure for a riding mower according to claim 1, wherein a duct for guiding the rear part of the machine body is inserted and arranged.

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