KR100416648B1 - Transmission of the vehicle - Google Patents

Abstract

Apart from the output shaft of the conventional front wheel differential device, in the transmission configuration of the traveling vehicle in which the side clutches that block the power transmission to the left and right rear wheels on the power transmission shaft are not constituted separately. It must be made, and it requires extra space, so that miniaturization is limited.

The present invention aims to reduce the size and weight of the power transmission device of a traveling vehicle by reducing the number of parts.

Description

Power transmission device for driving vehicle {Transmission of the vehicle}

The present invention relates to a power transmission device for a traveling vehicle.

Background Art Conventionally, for example, in a passenger-type rice transplanter, power from an engine that is a prime mover is transmitted to the left and right front wheels and the left and right rear wheels in a mission case, and branched by the front wheel differential device which becomes a left and right power transmission branch to the left and right front wheels, and the front wheel differential. Some power transmission devices are provided with side clutches that transmit power by the left and right output shafts of the device and block power transmission to the left and right rear wheels.

The power transmission device has a configuration in which the front wheel differential device is provided on the output shaft of the front wheel differential device. It is the structure provided in the shaft which transmits power to the rear wheel of a power transmission downstream side rather than a front wheel differential device.

Therefore, in the power transmission device of the traveling vehicle of the prior art, the output shaft (power transmission shaft) in the left and right directions from the left and right power transmission branching portions which branch the power transmission to the left and right wheels on either of the left and right front wheel and the left and right rear wheels. In addition, since the side clutch which cuts off the power transmission to the left and right wheels from the other of the said left and right front wheel and the left and right rear wheel is provided on the power transmission shaft, unless the power transmission shaft which installed the said side clutch is comprised separately, Otherwise, the extra space is required, which limits the miniaturization of the machine body, increases the cost by increasing the number of parts, increases the weight of the machine body, and causes the deterioration of running performance.

In order to solve the drawbacks of the prior art as described above, the present invention provides a power transmission device of the traveling vehicle that can be reduced in size and reduced weight by reducing the number of parts of the power transmission apparatus of the traveling vehicle. It is a problem.

1 is a side view of a passenger rice transplanter.

2 is a plan view of a riding type rice transplanter.

3 is a side view showing a power transmission configuration from an engine into a main mission case.

Fig. 4 is a side view showing the stop lever and the main clutch pedal.

5 is a cutaway plan view illustrating power transfer in the main mission case.

6 is a side view showing the position of the power transmission shaft in the main mission case.

Fig. 7 is a rear sectional view of the front wheel shaft.

8 is a rear cross-sectional view showing another front wheel shaft.

[Explanation of symbols for the main parts of the drawings]

2 … Driving vehicle, 5... engine,

15... Primary mission case, 19... Front Wheel,

23. Rear wheel, 38... Side clutch body,

77. Front wheel differential device, 78. Differential output shaft

The present invention has the following technical means to solve the above problems.

That is, the invention according to claim 1 diverges power from the prime mover 5 to the left and right wheels 19 of either the left and right front wheels 19 and the left and right rear wheels 23 by the left and right power transmission branch 77. In a power transmission device of a traveling vehicle which transmits power by a power transmission shaft 78 in a direction and transmits power through the side clutch 38 to the other left and right wheels 23, the left and right power transmission branch portions. A power transmission device for a traveling vehicle, characterized in that 77 and side clutch 38 are provided on the power transmission shaft 78 in the left and right directions.

Therefore, the power transmission device of the traveling vehicle of Claim 1 concentrates and arrange | positions the said left-right power transmission branch part 77 and the side clutch 38 on the power transmission shaft 78 in the left-right direction.

The invention according to claim 2 is a traveling vehicle according to claim 1, wherein the left and right power transmission branch portions are made of the differential device 77, and side clutches 38 are provided on the left and right sides of the differential device 77. It's a power train.

Therefore, the power transmission device of the traveling vehicle of Claim 2 concentrates and arrange | positions the said differential apparatus 77 and the side clutch 38 on the power transmission shaft 78 of the left-right direction.

EXAMPLE

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

1 and 2 show a passenger-type rice transplanter 1, wherein the passenger-type rice transplanter 1 is mounted via a lifting vehicle 2 and a lifting link mechanism 3 at the rear of the driving vehicle 2. It is composed of a thermal hair transplant unit 4, while driving the hair transplant unit 4 while driving the machine main body by the traveling vehicle 2 to transplant four rows of hair at the same time in the paddy field.

An engine 5 serving as a power source is provided in the front, rear, right and left centers of the traveling vehicle 2, and the cockpit 6 is disposed above the engine 5. By the driving of the engine 5, the dual relay pulleys 9 and 10 through the engine output pulley 7 and the engine output belt 8 which rotate integrally with the shaft 5a from the engine output shaft 5a. And a relay shaft 11 integrally rotating with the relay pulleys 9 and 10, and through the main mission case input belt 12 and the main mission case input pulley 13 in the relay pulley 10. Power is transmitted to the main mission case input shaft 14 which rotates integrally with 13, and the power is transmitted into the main mission case 15 by the input shaft 14. The front wheel axle 18 transmits power into the front wheel lower power transmission case 17 of the front wheel shaft 16 attached to the left and right ends of the main mission case 15, and protrudes from the bottom of the case 17. And the left and right front wheels 19 are driven. In addition, rear and rear rear power transmission shafts 20 which transmit power to the rear of the main mission case 15 are provided, and the rear wheel power of each of the left and right sides is driven by driving of the rear and rear rear power transmission shafts 20. Power is transferred into the transmission case 21, and the rear wheel axle 22 protruding from the rear wheel power transmission case 21 is driven to drive the left and right rear wheels 23. Therefore, the traveling vehicle 2 is configured to drive by driving the front wheels 19 and the rear wheels 23.

The engine 5 is arranged above the rear wheel power transmission shaft 20, and the upper end of the engine 5 is configured to be lower than the upper end of the rear wheel 23. Accordingly, the rear wheel power transmission shaft 20 is gathered at the left and right centers of the machine main body so that the steering angle of the front wheels 19 is increased, and the engine 5 is arranged up and down with the engine 5, and the engine 5 is higher than the upper end of the rear wheels 23. By lowering the vertical gap between the engine 5 and the rear wheel power transmission shaft 20 so that the upper end of the c) is lowered, the engine 5 can be placed at a lower position, whereby the center of the machine main body can be reduced. The machine body of a four-row rice transplanter with a small left and right wheel tread can be suppressed from falling in the left-right direction. Moreover, by arrange | positioning the engine 5 to a low position, the position of the cockpit 6 above the engine 5 can be made low, and the center of a machine main body can be aimed at. Moreover, the engine 5 is arrange | positioned so that the engine output shaft 5a may be lower than the upper end of the front wheel 19, and the engine 5 is arrange | positioned at the low position, and aims at the center of the machine main body. In addition, the engine output shaft 5a, the relay shaft 11, and the main mission case input shaft 14 are formed at substantially the same height, and the upper surfaces of the engine output belt 8 and the main mission case input belt 12 face forward and backward. Since the structure is almost horizontal in step, the step floor S can be configured low, and the positioning of the cockpit 6 and the center of the machine main body can be achieved. Further, since the main mission case input belt 12 is disposed above the front wheel shaft, and the front wheel shaft is disposed between the relay pulley 10 and the main mission case input pulley 13 in the front and rear directions, the relay pulley ( 10) or the main mission case input pulley 13 is placed below, so that it does not interfere with the front wheel shaft, so that it is possible to lower the main mission case input belt 12 to the extent that it does not interfere with the front wheel shaft. In addition, the footrest S can be made low, and the position of the cockpit 6 can be reduced, and the center of a machine main body can be aimed at.

The mother implant part 4 is provided so that it may be raised and lowered up and down by the periphery of the lifting link mechanism 3 by the expansion and contraction of the hydraulic lifting cylinder 24. In addition, the mother implant portion 4 is operated by the transmission power transmission shaft 26 is bent in the middle portion, which extends backward from the case 15 by the power from the main mission case (15) It becomes the structure to say. Furthermore, an implant clutch (not shown) is provided in the main mission case 15 for connecting and disconnecting the drive of the parent implant 4.

In addition, a steering wheel 27 is provided in front of the cockpit 6, which is the front part of the traveling vehicle 2, and the steering shaft 28 and the main mission case 15 are operated by the steering wheel 27 operation. The front wheels 19 on the left and right sides are rotated by rotating the front wheel lower power transmission case 17 of the front wheel shaft 16 through a pitman arm 29 and a tie rod 29a installed at the lower portion of the front wheel shaft 16. Steering and steering. On the left side of the steering handle 27, a main gear lever 30 is provided for changing and shifting gears in the main mission case 15. The right side of the steering wheel 27 has a throttle lever 31 for changing the rotation speed of the engine 5. The main gear lever 30 and the throttle lever 31 are configured to extend upward from the left and right side portions 32a of the front bonnet 32 of the traveling vehicle 2, respectively.

The left and right sides of the front bonnet 32 of the traveling vehicle 2 are formed with protrusions 33 which are lower than the front bonnet 32 and higher than the footrest S, respectively. The projection 33 on the left side has a stop lever 34 in which an operation of stopping the traveling of the machine main body and the driving of the mother implantation part 4 is performed. The projecting portion 33 on the right side also operates a hydraulic lift cylinder 24 and a transplantation clutch to transplant and lift the parent implant 4 and the operation of the parent implant 4. It has the lever 35.

The rear shifting portion 32b of the front bonnet 32 is provided with an auxiliary shift lever 36 for shifting by shifting gear bites in the main mission case 15. In addition, the sub-shift lever 36 is to be changed in two stages of normal speed and ultra-low speed, the machine main body is safely changed to ultra-low speed when over the bank of the rice field or when loading the machine body in the truck Can be driven.

Brake pedals 37 are provided on the right and left sides of the front part of the traveling vehicle 2, respectively, and the left and right side clutch bodies 38 are installed in the main mission case 15 by stepping on the brake pedals 37, respectively. Is operated to block power transmission to the left and right rear wheels 23 and to brake the rear wheels 23 at the same time.

In addition, a main clutch pedal 39 is provided on the left side of the front portion of the traveling vehicle 2. The main clutch pedal 39 is disposed at the same position as the brake pedal 37 on the left and right when viewed from the side of the machine main body. Thus, the tension pulley arm 41 supporting the tension pulley 40 on the upper side of the main mission case input belt 12 by operation to the rear of the stop lever 34 or by stepping on the main clutch pedal 39. Rotate upward to remove the tension pulley 40 from the main mission case input belt 12 to change the main mission case input belt 12 to a state that does not transmit power, running and transplanting the main body of the machine body The drive of the section 4 is stopped. In addition, the tension pulley arm 41 is subjected to an elastic force in the direction of pivoting toward the main mission case input belt 12, that is, downward by the tension spring 42 provided on the arm 41. In addition, the four-wheel brake operation arm 45 is rotated through the four-wheel brake operation rod 44 by rotating the four-wheel brake operation arm 43 forwardly integrally with the upward rotation of the tension pulley arm 41. To operate the four-wheel brake device 46 in the main mission case 15 to brake the left and right front and rear wheels 19 and 23.

In addition, the tension pulley arm 41 can be rotated upward through the stop lever rod 47 by the operation of the stop lever 34, and the stop lever 34 also acts like the main clutch pedal 39. The operation is made.

Referring to the operation linkage configuration of the main clutch pedal 39, the main clutch pedal arm 47 provided with the pedal 39 at the pivot end by the step of pressing the main clutch pedal 39, the main mission case Main clutch connected to the link 48 through the main clutch operation link 48 connected to the main clutch pedal arm 47 as it rotates around the left and right pedal pivot shaft 47a provided in the (15). The operation arm 49 rotates backward around the rotation point 49a. The tension pulley arm 41 which rotates integrally with the arm 49 is rotated around the rear of the main clutch operation arm 49, and the tension pulley 40 is the main mission case input belt 12. ) Is configured to come off.

The parent implant portion 4 is composed of a mother loading table 50, a transplant power transmission unit 51 and a four-row parent implant device 52 as the main portion, the power of the transplant power transmission shaft 25 is inputted The power is transmitted and operated through the implanted power transmission unit 51. Moreover, although the center float 53 and the side float 54 are provided in both the center part in the lower part of the mother transplant part 4, the said float 53 and 54 are comprised so that the paddy field surface may slide. In addition, by moving the mother implantation device 52 and at the same time by moving the left and right rods 55 to the left and right by the power from the transplant power transmission unit 51 to move the mother loading table 50 to the left and right, It is a structure which takes a single | foreign piece | grain by one yam seedling transplanting apparatus 52 on a mat, and transplants it into a rice field.

The mother loading belt 50 is provided with the mother conveyance belt 56 in each row. The mother conveyance belt 56 in each row is wound around the lower driving roller 57 and the upper driven roller 58. In addition, the driving roller 57 is configured to rotate by the power in the implantation power transmission unit 51, the parent transfer belt 56 at the end of the left and right movement of the mother loading table 50, the transplant apparatus It sequentially transfers to the 52 side by a predetermined amount.

Next, the power transmission configuration in the main mission case 15 will be described. The power is transmitted to the main mission case 15 by the main mission case input shaft 14 which rotates integrally with the main mission case input pulley 13. And a sub-speed driven side gear 61 meshing with the sub-shift drive-side gear 16 which rotates integrally with the input shaft 14, and the peripheral speed power transmission shaft that rotates integrally with the gear 61. Power is transmitted to 62. Further, the sub transmission drive side gear 60 and the sub transmission driven side gear 61 each have large diameter gears 60a and 61a and small diameter gears 60b and 61b, and at the same time, the sub transmission The drive side gear 60 is slidably provided along the main mission case input shaft 14 by a sub-shift operation shifter 63 which is operated by the operation of the sub-shift lever 36. Therefore, the power transmission ratio can be changed in two stages by the sub-shift operation shifter 63, so that the small-diameter gear 60b on the sub-shift drive side and the large-diameter gear 61a on the sub-shift driven side mesh with each other ( In the state shown in Fig. 5), power is transmitted at a low speed (ultra low speed), and at a high speed (normal speed) in a state where the large-diameter gear 60a on the sub-shift drive side and the small-diameter gear 61b on the sub-shift driven side are engaged. Power is transmitted.

At the right end of the main transmission power transmission shaft 62, an implantation drive gear 64 that is integrally rotated with the shaft 62 is installed, and is implanted through an implanted driven gear 65 that meshes with the gear 64. Power is transmitted to the bevel gears 66 and 67, and the power is transferred to the implanted power transmission shaft 26 extending backward to drive the parent implant 4. Moreover, the implant drive gear 64 and the implant driven gear 65 can open the cover 68 provided on the right side of these gears to exchange the gears 64 and 65 with each other, so that Therefore, it is possible to change the period of implantation by changing the drive speed of the parent implant (4).

Then, the main gear gear 69 which rotates integrally with the main transmission power transmission shaft 62 is driven. Moreover, the main gear 69 has a large diameter gear 69a and a small diameter gear 69b, and is operated by the main gear operating shifter 70 operated by the operation of the main gear lever 30. A slide is provided along the transmission shaft 62. Then, in the state where the peripheral speed large diameter gear 69a and the small diameter counter gear 72 which are integrally rotated with the counter shaft 71 are engaged (shown in FIG. 5), the power is driven at high speed (road running speed). Is transmitted, and in this state, the main gear 69 slides to the left and the main gear small diameter gear 69 b and the large diameter counter gear 73 which rotate integrally with the counter shaft 71 are engaged with the low speed (transplantation operation speed). The power is transmitted to Moreover, when the main gear 69 slides to the left, the main gear small diameter gear 69b and the reverse small diameter counter gear 74b on the main mission case input shaft 14 are engaged, and the reverse small diameter counter gear 74b is engaged. Power is transmitted to the reverse counter gear 75 on the counter shaft 71 engaged with the reverse large diameter counter gear 74a integrated with Is transmitted, and becomes the reverse speed for reversing the machine body. Further, the reverse small diameter counter gear 74b and the large diameter counter gear 74a for reverse are provided so as to idle with respect to the main mission case input shaft 14. In addition, the main gear shifter 70 can make the main gear 69 not engage with any of the gears, and the front wheels 19 and the rear wheels 23 are operated by operating the main gear lever 30. It is possible to make it into the state (neutral) in which power is not transmitted. Further, a four-wheel brake device 46 of shoe type is provided at the left end of the counter shaft 71, and the four-wheel brake device 46 is provided to the front and rear wheels 19 and 23 on the left and right sides. It is a structure which gives a braking force.

Then, power is transmitted to the front wheel differential device 77 by the front wheel differential input gear 76 meshing with the gear 72 from the small-diameter counter gear 72 which rotates integrally with the counter shaft 71. Power is transmitted to the left and right front wheels through the right and left front wheel shafts 16 by the differential output shafts 78 extending from the front wheel differential device 77 to the left and right, respectively. The front wheel differential device 77 has case bodies 77a and 77b constituting a differential case on the left and right sides of the front wheel differential input gear 76. Since the left and right case bodies 77a and 77b are formed in substantially the same shape as the left case body 77a has a slightly larger left and right width, for example, when the case bodies 77a and 77b are manufactured by casting, It is used together with the left and right case body (77a, 77b) to reduce the manufacturing cost of the mold, and after casting slightly different processing on the left and right case body (77a, 77b), each case body (77a, 77b) ), It is possible to reduce the manufacturing cost. Further, the left and right case bodies 77a and 77b may have the same shape, and in the case of manufacturing the case bodies 77a and 77b with the same casting, the molds related to casting are put together in the left and right case bodies 77a and 77b. It is possible to use, thus reducing the manufacturing costs.

Differential locking body is formed at the left end of the left case body 77a of the front wheel differential device 77 and has a differential locking hook 80 engaged with the hook portion 79. 81 is provided on the differential output shaft 78 so as to rotate integrally with the shaft 78. The differential locking body 81 is installed to be slidable left and right along the differential output shaft 78 and at the same time receives an elastic force on the opposite side to the case body 77a on the left side by the differential locking body pressure spring 82. The left side case body (77a) is resisted to the differential locking body pressure spring (82) by the differential locking operation shifter (84) which operates by stepping on the front wheel differential locking pedal (83) installed on the footrest (S). It is supposed to slide to the right. Accordingly, the differential locking body 81 is slid by the differential locking operation shifter 84 to engage the differential locking hook 80 with the differential locking hook portion 79 of the case body 77a on the left side, and the case The body 77a and the left and right differential output shafts 78 are integrally rotated to lock the left and right front wheels 19 differentially.

In addition, each of the case bodies 77a and 77b on the left and right sides of the front wheel differential device 77 has an internal gear 85 having teeth inside the circumference. Further, side clutch bodies 38 having gears 86 engaged with the inner gears 85 are provided on the left and right sides, so that the case bodies 77a and 77b and the side clutch body 38 rotate integrally. It is. Then, power is transmitted to the rear wheel power transmission gears 88, which are engaged with the gear 86 of the side clutch body 38. Then, power is transmitted from the left and right rear wheel power transmission gears 88 to each of the left and right driving bevel gears 90 which are integrally rotated with the rear wheel power transmission gear 88 through the rear wheel counter shaft 89. It is configured to transmit power to the rear wheel power transmission shafts 20 of the left and right through the driven bevel gears 91 which are engaged with the driving bevel gear 90.

Furthermore, the left and right rear wheel power transmission shafts 20 are provided in the left case part 15a of the main mission case 15 divided left and right, and the distance between them is small to concentrate on the left and right centers of the main body of the machine, and the left and right treads. It arrange | positions so that it may not become an obstacle in steering of the front wheel 19 with a narrow width | variety.

The side clutch body 38 is provided with a brake disc 92. In addition, the side clutch body 38 is slidably mounted from side to side on the differential output shaft 78 guided to the case bodies 77a and 77b of the front wheel differential device 77 and at the same time the side clutch body pressure spring 93. The side clutch operation shifter 94 which receives elastic force toward the inner gear 85 (left and right center directions) installed in the case bodies 77a and 77b, and operates by stepping on the left and right brake pedals 37, respectively. As a result, the side clutch body is pressed against the pressure spring 93 so as to slide away from the inner gear 85 (right side). Accordingly, the side clutch body 38 is slid by the side clutch operation shifter 94, and the gears 86 of the side clutch body 38 and the interior of the case bodies 77a and 77b of the front wheel differential device 77 are made. While releasing the gear 85, the brake disc 92 is pressed against the inner wall surface of the main mission case 15, and the power transmission to the left and right rear wheels 19 is blocked, and the rear wheel ( It is configured to brake 19). Furthermore, the gear of the side clutch body 38 is configured to engage the rear wheel power transmission gear 88 without being bound to the left and right slides of the side clutch body 38, so that the braking force is applied by the brake disc 92 to the rear wheel ( 23).

As shown in FIG. 7, the front wheel shaft 16 is composed of a front wheel upper power transmission case 101 and a front wheel lower power transmission case 17, and the front wheel upper power transmission case 101 is attached to the main mission case. Is installed. An end portion of the differential output shaft 78 protruding from the main mission case is coupled to the drive bevel gear 102 in the front wheel upper power transmission case 101 and is configured to transmit power to the gear 102. In the front wheel upper power transmission case 101, power is transmitted to a driven bevel gear 103 engaged with the driving bevel gear 102, and the power in the vertical direction is integrally rotated with the driven bevel gear 103. Power is transmitted to the transmission shaft 104. Furthermore, bearings 105 and 106 which accommodate the power transmission shaft 104 in the vertical direction are provided above and below the driven bevel gear 13, and the front wheel upper power transmission case 101 is disposed below the lower bearing 106. An oil seal 107 is installed to prevent the lubricant from leaking out. In addition, the front wheel upper power transmission case 101 is configured to have a split surface b1 in a position overlapped with the shaft 104 along the up and down direction of the power transmission shaft 104 so as to be divided left and right. It is configured by assembling and fastening the left and right divided cases 101a and 101b on the divided surface by fastening bolts (not shown).

The up and down power transmission shaft 104 protrudes downward from the front wheel upper power transmission case 101, and the protrusion penetrates into the front wheel lower power transmission case 17. A lower drive bevel gear 108 that is integrally rotated with the shaft 104 is installed at the lower end of the power transmission shaft 104 in the vertical direction, and is driven by the lower driven bevel gear 109 that meshes with the gear 108. To pass. The front wheel axle 18 rotates integrally with the lower driven bevel gear 109. Furthermore, in the front wheel lower power transmission case 17, two bearings 110 and 111 supporting the vertical power transmission shaft 104 are provided above the lower driving bevel gear 108, Bearings 112 and 113 supporting the front wheel axle 18 are provided on the left and right of the lower driven bevel gear 109. In addition, the upper end of the front wheel lower power transmission case 17 of the power transmission shaft 104 in the up and down direction and the front wheel lower power transmission case 17 of the front wheel 19 side of the front wheel axle 18 are at the front wheel lower power transmission. The oil seals 114 and 115 are respectively provided so that the lubricating oil in the case 17 may not leak out.

In addition, the front wheel lower power transmission case 17 is configured to be divided back and forth by having a split surface b2 at a position overlapping with the shaft 104 along the power transmission shaft 104 in the vertical direction when viewed from the side. The case is configured by assembling and fastening the front and rear split cases 17a and 17b on the split surface b2 by fastening bolts (not shown). Further, the divided surface b2 is provided to pass through the front wheel axle 18. In addition, the front wheel lower power transmission case 17 is installed to rotate around the power transmission shaft 104 in the vertical direction with respect to the front wheel upper power transmission case 101, the tie rod which is operated by the operation of the steering wheel 27. This configuration is configured to rotate by (29a).

As described above, in the main mission case 15, the power from the engine 5 is branched by the front wheel differential device 77 to the front wheels 19 on each of the left and right sides, and is driven by the differential output shaft 78 in the left and right directions. At the same time, power is transmitted to the rear wheels 23 at the left and right sides through the side clutch body 38 installed at the left and right sides of the front wheel differential device 77, and the brake disc 92, the side clutch body 38, The differential locking body 81 and the front wheel differential device 77 are provided on the differential output shaft 78.

Therefore, since the brake disc 92, the side clutch body 38, and the front wheel differential device 77 are concentrated on the differential output shaft 78, the side brake device 92 and the side clutch 38 are located. It is not necessary to separately configure the power transmission shaft having a), and by reducing the number of power transmission shafts in the left and right directions, it is possible to reduce the center of the machine main body by downsizing the main mission case 15 in the vertical direction. In addition, by reducing the number of power transmission shafts in the left and right directions, the front and rear lengths of the main body of the machine can be reduced by reducing the front and rear directions of the main mission case 15, and the untransplanted areas on the banks of the rice fields are reduced. In addition, it is possible to improve the swingability (small rotation radius) of the machine main body. In addition, cost reduction due to the reduction of the number of parts can be achieved, and the weight of the machine body can be reduced. Therefore, even when the engine 5 having a small output is used as the driving force, it is possible to suppress the inability to run due to the depth of the paddy field. It is possible to maintain running performance.

In addition, the left and right side clutch 38 and the side brake device 92 which require an arrangement space are disposed on the differential output shaft 78 which transmits power into the front wheel shaft 16, and the front wheel axle 18 in the front and rear directions. Since it is arranged intensively at a position close to), the left and right widths of the main mission case 15 can be configured to be smaller than the position of the differential output shaft 78, and the steering wheel angle of the front wheel 19 is increased. It is possible.

In addition, the passenger-type rice transplanter 1 attaches the front wheel shaft 16 to the rear of the main mission case 15 and installs the front wheel 19 in the rear of the main mission case 15 in the front and rear directions. 19) and the distance (wheel base) of the rear wheel 23 can be made small, and the rotational performance (small rotation radius) of a main body of a machine can be improved, and the said main mission case 15 with a large weight is carried out. It is arranged in front of the front wheels 19, and is provided with the parent implant part 4 in the rear, and the structure which aimed at the improvement of the front-back balance of a main body of a machine is achieved. Furthermore, by miniaturizing the main mission case 15, the main mission case 15 can be disposed in front of the main body of the machine, and the parent implant portion 4 is provided at the rear to improve the front and rear balance of the main body of the machine. can do.

By the way, in a conventional agricultural machinery such as a tractor or a rice transplanter, in the transmission of power to the front wheels of the left and right, the power from the engine as the prime mover is lowered through the power transmission shaft in the upper and lower directions from the upper upper power transmission case. It is configured to drive the front wheel axle protruding from the lower power transmission case by transmitting into the lower power transmission case, the upper power transmission case is fixed to the machine body side, the lower power transmission case to the upper power transmission case It is configured to be rotatable around the power transmission shaft, and has a traveling vehicle configured to steer each of the front and rear wheels around the power transmission shaft, wherein the upper power transmission case and the lower power transmission case are each cylindrical integral case. Since it is constituted by the power transmission in the vertical direction For such assembly or maintenance of parts in the case, including withdrawing it within the casing there is a problem that is not easily done.

However, the passenger-type rice transplanter 1 which is an embodiment of the present invention transfers the power from the engine 5 to the lower front wheel lower power through the upper and lower power transmission shaft 104 in the upper front wheel power transmission case 101. The front wheel axle 18 protruding from the front wheel lower power transmission case 17 is transferred to the transmission case 17, and the front wheel upper power transmission case 101 is fixed to the machine main body, and the front wheel The lower power transmission case 17 is configured to be rotatable about the power transmission shaft 104 with respect to the front wheel upper power transmission case 101, and the front wheel upper power transmission case 101 and the front wheel lower power transmission case It is comprised so that division | segmentation (17) is divided | segmented into the division surface b1, b2 along the said power transmission shaft 104. FIG.

Therefore, since the front wheel upper power transmission case 101 and the front wheel lower power transmission case 17 are configured to be divided by the divided surfaces b1 and b2 along the power transmission shaft 104 in the vertical direction, these cases ( The parts connecting to the power transmission shaft 104 or the power transmission shaft 104 by dividing 101, 17, for example bearings 105, 106, 110, 111 and oil seals 107, 114 It is easy to assemble the inside of the case or to take it out of the case for the maintenance and the like. In addition, in the front wheel upper power transmission case 101 and the front wheel lower power transmission case 17, the shape in the case for assembling or disassembling the parts is not limited, so the degree of freedom of the shape increases, thereby miniaturization. It is possible to reduce the size and weight of the machine body. Further, in the front wheel upper power transmission case 101 for supporting the power transmission shaft 104, the lower bearing 106 and the lower bearing 111 in the front wheel lower power transmission case 17 are each of the case. It is fixed by the groove shape of the inner surface, and a snap ring or the like for fixing these bearings 106 and 111 is unnecessary, thereby reducing the number of parts and reducing the cost.

Further, the riding type rice transplanter 1 has different directions of the divided surface b1 of the front wheel upper power transmission case 101 and the divided surface b2 of the front wheel lower power transmission case 17.

That is, the passenger-type rice transplanter 1 has a different direction so as to substantially cross the divided surface of the front wheel upper power transmission case 101 and the divided surface of the front wheel lower power transmission case 17 in a substantially vertical direction. Compared with the above, since the upper power transmission case 101 and the lower power transmission case 17 are each composed of divided cases divided at divided surfaces, the degradation of the rigidity of each case 101 and 17 cannot be denied. The entire front wheel shaft 16 composed of the cases 101 and 17 can obtain desired strength even if the front and rear bending loads are generated due to the running resistance of the front wheels 19 or the left and right bending loads due to the weight of the machine body. It is possible to maintain the strength with respect to the load in any direction so that the rigidity of the entire front axle shaft 16 can be improved. It can be improved to FIG.

Moreover, since the divided surface b2 of the front wheel lower power transmission case 17 is provided along the front wheel axle 18, the parts related to the front wheel axle 18 and the axle 18, for example, bearing 112, are provided. , 113) and the oil seal 115 can be easily assembled in the case or removed from the case for maintenance or the like.

On the other hand, Fig. 8 shows a configuration different from that of the front wheel upper power transmission case 101 and the front wheel lower power transmission case 17, although the internal transmission configuration is the same as that described above. That is, the front wheel upper power transmission case 101 has the same shape as the above, but in the side view a split surface is provided at a position overlapping with the shaft 104 along the power transmission shaft 104 in the vertical direction It is configured to be split back and forth. In addition, the front wheel lower power transmission case 17 is configured to be divided into left and right by installing a split surface b3 at a position overlapping with the shaft 104 along the power transmission shaft 104 in the vertical direction when viewed from the rear. Doing. For this reason, instead of having to widen the said dividing surface for the rigidity of the front wheel lower power transmission case 17, the left-right width of the front wheel lower power transmission case 17 can be narrowed, and it is already in implantation work. When the main body of the machine travels at the position where the hair is transplanted, the case 17 can be prevented from interfering with the implanted hair, such as an obstacle on the ground, by the traveling of the main body of the machine.

Moreover, although the Example of this invention demonstrated the 4-row riding type rice transplanter 1, this invention is not limited to a 4-row rice transplanter.

Therefore, since the power transmission device of the traveling vehicle according to the present invention arranges the left and right power transmission branch portions and the side clutches on the upper side of the power transmission shaft in the left and right directions, it is necessary to separately configure the power transmission shaft with the side clutch installed. Therefore, the power transmission device can be downsized, the machine body can be downsized, the cost can be reduced by the reduction of the number of parts, and the machine body can be reduced in weight to maintain good running performance.

Claims (2)

The power from the prime mover 5 diverges to the left and right wheels 19 of either the left and right front wheels 19 and the left and right rear wheels 23 by the left and right power transmission branch 77 and the power transmission shaft 78 in the left and right directions. In the power transmission device of a traveling vehicle that transmits power by the power, and transmits power through the side clutch 38 to the other left and right wheels 23, The power transmission device of a traveling vehicle, characterized in that the left and right power transmission branch (77) and the side clutch (38) are installed on the power transmission shaft (78) in the left and right directions. The method of claim 1, A power transmission device for a traveling vehicle, characterized in that the left and right power transmission branch portions are differential devices (77), and side clutches (38) are provided on the left and right sides of the differential device (77).