JP4624760B2 - Riding work machine - Google Patents

Description

  The present invention relates to a riding work machine.

  Conventionally, as one form of riding work machine, various working units are connected to the rear of a traveling unit capable of self-propelling, and transmission is performed between a PTO shaft provided in the traveling unit and an input shaft provided in various working units. There is one provided with a mechanism (see, for example, Patent Document 1).

The transmission mechanism is formed of a front case and a rear case extending in the front-rear direction, interlockingly connecting the front end portion of the front case to the PTO shaft, and connecting the front end portion of the rear case to the rear end portion of the front case. It is linked and the rear end of the rear case is linked to the input shaft.
Japanese Patent Laid-Open No. 11-12002

  However, when a rotary type tillage device that performs forward rotation work and reverse rotation work as appropriate is connected to the rear of the traveling part as various working parts, the transmission mechanism can change the rotation direction of the tillage shaft provided in the tilling device. Therefore, the rotation direction must be changed by the transmission system on the side of the tillage device, and there is a problem that a general purpose tillage device cannot be used.

  Therefore, in the present invention, various working units are connected to the rear of the traveling unit capable of self-running, and a transmission mechanism is interposed between the PTO shaft provided in the traveling unit and the input shaft provided in the various working units. In the riding work machine, the transmission mechanism is formed of a front case and a rear case, and at least three transmission gears continuously meshed in the front-rear direction are disposed in the front case, and the transmission mechanism is positioned at the foremost part. The PTO shaft is linked and connected to the transmission gear, while the transmission shaft provided on the rear case is selectively linked and connected to the remaining transmission gear and connected to the transmission shaft and the rear end of the rear case. It is intended to provide a riding work machine characterized in that the input shaft is interlocked and connected.

Also, in the present invention, the transmission gear, characterized in that each with different number of teeth.

( 1 ) In the invention described in claim 1 , various working units are connected to the rear of the traveling unit capable of self-running, and between the PTO shaft provided in the traveling unit and the input shaft provided in the various working units. In a riding work machine having a transmission mechanism, the transmission mechanism is formed of a front case and a rear case, and at least three transmission gears continuously meshed in the front-rear direction are disposed in the front case. The PTO shaft is linked and connected to the transmission gear located in the foremost part, while the transmission shaft provided in the rear case is selectively linked and linked to any of the remaining transmission gears. The input shaft connected to the rear end is linked and connected.

In this manner, the forward / reverse rotation direction of the input shaft can be easily changed by selectively interlocking the transmission shaft provided in the rear case to one of the remaining transmission gears disposed in the front case. can do.

( 2 ) In the invention described in claim 2 , the transmission gears have different numbers of teeth.
In this way, by changing the number of teeth of the transmission gear and selectively changing the transmission gear linked to the PTO shaft and the input shaft, the rotational speed transmitted from the PTO shaft to the input shaft can be simplified. It is possible to change the speed.
As a result, the rotation speed adapted to the working conditions can be adopted as appropriate, and the work can be performed efficiently.

  In addition, by changing the number of teeth of the transmission gear and changing the front case back and forth and interlockingly connecting the PTO shaft and the transmission shaft, the rotational speed transmitted from the PTO shaft to the input shaft can be easily changed. be able to.

  In addition, when various working parts are attached to the traveling part so as to be able to move up and down, the front case and the rear case can be bent in a bent state around the transmission shaft, and the transmission mechanism can be used to lift and lower the various working parts. Can be avoided.

  A shown in FIGS. 1 to 3 is a small riding work machine according to the present invention. The riding work machine A is provided with a lifting mechanism 17 at the rear part of a traveling part B capable of self-propelling. A tilling part C as one form of various working parts is connected via a hitch part 18.

  The traveling part B is provided with a mission part 2 at a substantially central part on the body frame 1, and front wheel transmission shaft cases 3, 3 are connected to the left and right side parts of the transmission part 2, respectively. 3 and 3, front wheels 4 and 4 are attached via front axles 4a and 4a, and rear wheel transmission cases 5 and 5 are provided on the left and right rear portions on the body frame 1, respectively. Rear wheels 7 and 7 are attached via rear axles 7a and 7a, and transmission shaft cases 6 and 6 are interposed between the left and right sides of the transmission unit 2 and the left and right rear wheel transmission cases 5 and 5, respectively. The vehicle body support structure 8 is configured.

  The vehicle support structure 8 is provided with a driving portion 9 at the front, and an engine 10 and a fuel tank 11 are disposed between the transmission portion 2 and the left and right rear wheel transmission cases 5 and 5. The transmission unit 2 is linked to the engine 10 via a first transmission mechanism 12.

  In addition, a pair of left and right working unit linkages 14, 14 project rearward from the rear end of the machine body frame 1, and a PTO shaft 15 is horizontally mounted between the two working unit linkages 14, 14. The PTO shaft 15 is interlocked and connected to the engine 10 via the second transmission mechanism 16, and an elevating mechanism 17 is provided at the rear end of the body frame 1, and a tillage part C and a hitch part 18 are provided in the elevating mechanism 17. Are connected through.

  In this way, the tilling part C is connected to the rear of the vehicle body support structure 8 via the lifting mechanism 17 so as to be able to be lifted and lowered, and the transmission case 19 as a transmission mechanism is connected to the input shaft 41 of the tilling part C from the PTO shaft 15. The power can be transmitted via

  As shown in FIGS. 1 to 3, the airframe frame 1 is formed by extending rearward from the left and right lower portions of the mission unit 2 and standing up and rearward from a position directly above the rear axles 7 a and 7 a. Main frame 20, 20, a subframe 21 having a rectangular frame shape between the front end portion of the mission section 2 and the rear end portions of both main frames 20, 20, and the subframe 21 being raised and lowered And a front optic-type roll bar 22 which is erected freely. 23 is a subframe stay.

  As shown in FIGS. 1 to 3, the operation unit 9 has a handle post support 27 mounted on the front portion of the sub-frame 21 in a forward inclined state, and a handle post (not shown) on the handle post support 27. ) With the handle post 28 inserted in the handle post 28, and the handle 29 attached to the upper end of the handle support shaft 28. On the other hand, a front wheel steering mechanism 30 is interposed between the lower end of the handle support shaft 28 extended below the handle post support 27 and the lower portion of the transmission section 2, and the handle post is covered with the handle column 31. A brake lever 32 is attached to the left side wall of the handle column 31, and a PTO clutch lever 33 is attached to the right side wall of the handle column 31.

  A seat 35 is placed on the mission unit 2 via a seat support machine frame 34, and a main speed change operation lever 36 and an auxiliary speed change operation lever 37 are disposed on the left side of the seat 35, while the right side. A lifting operation lever 38, a working part transmission clutch on / off operation lever 39, and a tilling depth adjustment operation lever 40 are provided.

  Next, the lifting mechanism 17 will be described. As shown in FIGS. 1, 2, and 4, the lifting mechanism 17 is a top link front end connecting piece projecting downward from the shaft case 42 covering the PTO shaft 15. 43, a top link 44 having a front end connected to the front end connecting piece 43, a pair of left and right lower links 45, 45 having front ends connected to the rearward extending ends 20a, 20a of the main frames 20, 20, and both lower links 45, 45 A three-point link mechanism comprising a lift cylinder 47 having a lower end connected to a subframe 46 horizontally mounted between the rear portions and a upper end connected to a rear horizontal frame 21a of the subframe 21 via a connection bracket 48. Yes. 49, 50 and 51 are connecting pins.

  As described above, since the lifting mechanism 17 is a three-point link mechanism, the lifting mechanism 17 can be lifted while substantially maintaining the working posture of the tilling portion C, and the working performance of the tilling portion C is good regardless of the lifting position. Can be secured.

  As shown in FIG. 4, the hitch portion 18 includes a front hitch forming body 52 attached to the rear end of the top link 44 of the lifting mechanism 17 and the rear ends of the pair of left and right lower links 45, 45, and the front end of the tilling portion C The rear hitch forming body 53 is attached to the front portion, and the rear hitch forming body 53 can be detachably connected to the front hitch forming body 52 with one touch.

  Therefore, in the present embodiment, the various working parts can be attached and detached by the hitch part 18 with one touch, so that women and women and elderly people can easily perform the attaching and detaching work.

  As shown in FIGS. 1 and 4, the transmission case 19 is formed by a front case 54 and a rear case 55 that are formed by extending in the front-rear direction, and the front end portion of the front case 54 is disposed on the side of the PTO shaft 15. The front end of the rear case 55 is interlocked to the rear end of the front case 54 via a transmission shaft 56, and can be bent in a convex shape around the transmission shaft 56. None, the rear end portion of the rear case 55 is interlocked with the input shaft 41 of the tillage portion C.

  As shown in FIGS. 1, 5 and 6, the tilling part C is constructed by laying the input shaft 41 on the upper part of the tilling case 70 extending in the vertical direction with the axis line extending in the left-right direction and the right end 41 a. While projecting rightward outward, a tillage shaft 71 is installed at the bottom with the axis line in the left and right direction, and a tillage transmission chain 74 is wound between the shafts 41 and 71 via sprockets 72 and 73. A tilling claw 75 is attached to 71.

  The rear hitch forming body 53 described above is attached to the upper front end of the tilling case 70. 76 is a support frame, 77 is a rotary cover, 78 is a rear cover, and 79 is a hanger rod.

  In the configuration as described above, the gist of the present invention is that, as shown in FIG. 5 and FIG. 6, at least three (three in the present embodiment) first and second transmission cases 19 mesh continuously. The second and third transmission gears 60, 61, 62 are provided, and the PTO shaft 15 and the transmission shaft 41 can be detachably connected to any one of the transmission gears 60, 61 (62) by a spline. There is something to do.

  That is, as shown in FIGS. 5 and 6, three first, second and third transmission gears 60, 61, which are continuously meshed in the front-rear direction in a front case 54 formed by extending in the front-rear direction. 62 is rotatably supported around the left and right axis, and the right end 15a of the PTO shaft 15 is spline-fitted to the first transmission gear 60 located at the foremost part so that it can be freely attached and detached. On the other hand, the right end portion 56a of the transmission shaft 56 provided in the rear case 55 is spline fitted to the remaining third transmission gear 62 so as to be detachably linked. Reference numerals 60a, 61a, and 62a denote spline fitting concave grooves.

  Then, a transmission chain 65 is wound through sprockets 63 and 64 between the transmission shaft 56 and the right end portion 41a of the input shaft 41 supported with the rear end portion of the rear case 55 directed in the left-right direction. Yes.

  In this way, the right end portion 15a of the PTO shaft 15 is interlocked with the first transmission gear 60, while the right end portion 56a of the transmission shaft 56 is interlocked with the third transmission gear 62, so that the second transmission gear 61 is connected. Can be set so that the rotation directions of the PTO shaft 15 and the input shaft 41 are the same.

  Further, as shown in FIGS. 7 and 8, the right end 15a of the PTO shaft 15 is spline-fitted to the first transmission gear 60 located at the foremost part so as to be detachably linked, while the remaining second transmission The right end portion 56a of the transmission shaft 56 provided in the rear case 55 may be spline fitted to the gear 61 so as to be detachably interlocked.

  In this way, for example, the right end portion 15a of the PTO shaft 15 is interlocked and connected to the first transmission gear 60, while the right end portion 56a of the transmission shaft 56 is interlocked and connected to the second transmission gear 61. 15 and the rotation direction of the input shaft 41 can be set to be opposite directions.

  Thus, the input shaft 41 can be selected by appropriately selecting which of the first, second, and third transmission gears 60, 61, 62 in the front case 54 is linked to the PTO shaft 15 and the transmission shaft 56. Since the normal / reverse rotation direction can be easily changed, a general-purpose cultivating section C can be used.

  In the present embodiment, the number of teeth of the first, second, and third transmission gears 60, 61, and 62 is sequentially changed to 14 pieces, 12 pieces, and 10 pieces, for example, and the front case The rotational speed transmitted from the PTO shaft 15 to the input shaft 41 can be easily changed by linking the PTO shaft 15 and the transmission shaft 56 in an interlocking manner by changing the position 54 back and forth.

  As a result, the rotation speed adapted to the work conditions can be adopted as appropriate, and the work can be performed efficiently.

  In addition, when the tilling part C is attached to the traveling part B so as to be able to move up and down, the front case 54 and the rear case 55 can be bent in a bent state around the transmission shaft 56 so that the raising and lowering of the tilling part C can be performed. It is possible to prevent the front and rear transmission cases 54 and 55 from hindering the operation.

  In the present embodiment, the right transmission end 15a of the PTO shaft 15 is spline-fitted to the first transmission gear 60 located at the foremost part so as to be detachably linked, while the remaining second transmission gear 61 or the first transmission gear 60 is connected. 3. The right end portion 56a of the transmission shaft 56 provided on the rear case 55 is spline-fitted to the transmission gear 62 and is detachably linked. However, the first transmission gear 60 or the second transmission gear 61 is connected to the PTO shaft. The right end 15a of the 15 can be detachably interlocked by spline fitting, while the right end 56a of the transmission shaft 56 can be spline fitted to the third transmission gear 62 and detachably interlocked. .

The side view of the small riding work machine which concerns on this invention. The top view of the small riding work machine. The top view of a body frame. The side view of a raising / lowering mechanism. Side view of the transmission case and the tillage case (same rotation direction). Cross-sectional plan view of the transmission case and the tilling case. Side view of the transmission case and the tilling case (reverse rotation direction). Cross-sectional plan view of the transmission case and the tilling case.

Explanation of symbols

A Riding work machine B Traveling part C Plowing part 1 Airframe frame 2 Mission part 3 Front wheel transmission shaft case 4 Front wheel 5 Rear wheel transmission case 6 Transmission shaft case 7 Rear wheel 8 Car body support structure 9 Driving part

Claims (2)

In a riding work machine in which various working units are connected to the rear of a traveling unit capable of self-running, and a transmission mechanism is interposed between a PTO shaft provided in the traveling unit and an input shaft provided in various working units,
The transmission mechanism is formed of a front case and a rear case, and at least three transmission gears continuously meshed in the front-rear direction are arranged in the front case, and the PTO shaft is disposed on the transmission gear located at the foremost part. The transmission shaft provided in the rear case is selectively linked to one of the remaining transmission gears, and the transmission shaft and the input shaft connected to the rear end of the rear case are linked. Riding work machine characterized by being connected. Transmission gears riding working machine according to claim 1 Symbol mounting, characterized in that each with different number of teeth.

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