JP4812388B2 - Transplanter - Google Patents

Description

The present invention relates to a transplanter such as a riding rice planter, and more particularly to a power transmission device thereof.

  Generally, in a transplanter, the power generated by an engine mounted on the front of the fuselage is input to a transmission via a continuously variable transmission and converted into a predetermined shaft speed, and then transplanted at a drive wheel or at the rear of the fuselage. It is used as power for work equipment and planting work is performed. A transmission mounted on a transplanter is configured by combining a transmission case, a plurality of shafts, and a transmission gear, and is widely used in transplanters as a device that converts input power to an appropriate output (for example, Patent Documents). 1).

Japanese Unexamined Patent Publication No. 2000-203291 (FIGS. 10 and 11)

  The transplanter is required to accommodate necessary equipment in a limited vehicle mounting space, and how to reduce transmission loss of engine power is a problem.

  In such a case, since the transmission for transmitting power is configured by combining a plurality of rotating shafts and transmission gears, the transmission case tends to increase in size and occupy equipment mounting space. Further, there may be a case where power transmission loss occurs due to frictional resistance of the transmission bearing portion, tooth surface contact resistance of the transmission gear, inertia, or the like.

  It is an object of the present invention to simplify the transmission structure and reduce the size of the transmission case by reducing the number of shafts and transmission gears constituting the transmission.

In order to achieve the above-mentioned object, the present invention according to claim 1 uses the power of the engine for the front wheel (14), the rear wheel (15), the planting work part (20) and other work through the transmission (5). In the transplanter (1) that is transmitted to the PTO shaft (82),
The transmission (5) is arranged in parallel to each other, a main shaft (52) to which power from the engine is transmitted, a traveling output shaft (53), a planting work unit output shaft (54), Have
A plurality of gears (61) of the main shaft (52) and a plurality of gears (66) of the traveling output shaft (53) constitute an auxiliary transmission unit (67),
First reduction gear between the rear wheel drive shaft from the transmission in conjunction previously Kihashi line output shaft (53) (5) wheel PTO shaft after extending rearwardly (58) (80) Intervening,
Before constitute Kihashi line output shaft of the gear (66) and the planting working unit output shaft of the second reduction gear by an idle gear rotatably supported on the (54) (64) (68),
Power is transmitted from the traveling output shaft (53) of the transmission (5) to the rear wheel (15) via the first reduction gear (80) and via the second reduction gear (68). Transmit power to the front wheel (14) ;
Regardless of the shift speed of the sub-transmission section (67), the transmission downstream rotation of the shift speed is transmitted to the rear wheel (15) via the first reduction gear (80). Transmitted to the front wheel (14) via the second reduction gear (68),
The transplanter is characterized by that.

According to a second aspect of the present invention, the first speed reducer (80) transmits power from the rear wheel PTO shaft (58) to the rear wheel drive shaft and the other work PTO shaft (82). ) Is arranged in a branch case (81) for transmitting power to
The transplanter according to claim 1.

  The reference numerals in the parentheses are for reference to the drawings and do not limit the present invention.

  According to the first aspect of the present invention, the rear wheel drive system has a speed reduction device interposed between the rear wheel PTO shaft extending from the transmission and the reverse drive shaft, and the front wheel drive system is for the planting work unit. Since the reduction gear is configured by supporting the idle gear on the output shaft, it is possible to omit the reduction gear shaft in the transmission, which has been necessary in the past, and to reduce the size of the transmission and to reduce power transmission loss. Can be minimized.

  According to the second aspect of the present invention, since the first reduction gear of the rear wheel drive system can use another conventional work PTO shaft branch case, other power associated with the change in the transmission can be used. Changes in the transmission system can be minimized.

According to the first aspect of the present invention, the sub-transmission unit is interposed between the main shaft and the travel output shaft, and the second stage is disposed downstream of the transmission regardless of the state of the shift stage by the transmission unit. Since the speed reducer is interposed, it is possible to obtain an appropriate traveling speed change during traveling and during work.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show an embodiment of the present invention. FIG. 1 is a side view of a transplanter, FIG. 2 is a development view of a transmission transmission mechanism in a working state, and FIG. 3 is a transmission transmission in a traveling state. FIG. 4 is a development view of the first speed reducer, and FIG. 5 is a development view of a transmission transmission mechanism showing a conventional example.

  As shown in FIG. 1, the transplanter 1 includes a traveling machine body 10 and a planting work machine 20 connected to the rear of the traveling machine body 10, and the traveling machine body 10 includes a body frame 12 and the body frame 12. A pair of left and right front wheels 14 supported respectively via a pair of left and right front axle cases disposed in front of the vehicle body, and a rear wheel supported by a pair of left and right rear axle cases 16 disposed behind the fuselage frame 12. 15.

  An engine and a transmission 5 are mounted on the front of the body frame 12 and covered with a body cover 13. A driver's seat 17 is disposed at the center of the fuselage frame 12, and in addition to a seat seat 18 and a steering handle 19, a lever, a pedal, a switch, a display device and the like necessary for driving are disposed in the driver's seat 17. Yes.

  The planting work machine 20 is connected to the rear part of the machine body frame 12 via an elevating link mechanism 21, a working part frame 22 connected to the elevating link mechanism 21 so as to be able to roll freely, and reciprocating left and right above the work frame 22. A seedling base 23 supported by the planting mechanism, a planting mechanism 24 for transplanting the seedlings, and a float 25 arranged so as to be swingable in the vertical direction below the planting mechanism 24.

  In the planting mechanism 24, power is transmitted by the planting PTO shafts 57 and 107 output from the transmission 5, and one seedling is scraped off from the mat-like seedling mounted on the seedling stand 23, and is put on the field. Configured to plant.

  The transplanter 1 is transmitted as power for driving the front and rear wheels 14 and 15 and the planting mechanism 24 while appropriately converting power by the transmission 5 using the engine as a power source, and seedling planting work is performed. In addition to the planting PTO shafts 57 and 107 and the traveling PTO shaft for driving the rear wheels, the transmission 5 has working PTOs 82 and 121 for general-purpose work such as a leveling machine. .

  The transmission structure according to the conventional example will be described with reference to FIG. 5. A transmission case 101 of the transmission 100 has a main shaft 102 to which power from an engine is input via a continuously variable transmission (not shown), and the main shaft 102. The intermediate transmission shaft 103, the planting work unit output shaft 104, and the travel output shaft 105 that are arranged in parallel at predetermined intervals are rotatably supported, and one end of the planting PTO shaft 107 and the rear wheel PTO shaft 108 is The main shaft 102, the intermediate transmission shaft 103, the planting work unit output shaft 104, and the travel output shaft 105 are supported so as to be rotatable in a substantially vertical direction.

  A work machine side output gear 110 for transmitting power to the planting work machine 20 and a traveling side gear 111 for transmitting power to the front and rear wheels 14 and 15 are slid in the axial direction by spline fitting. It is arranged to move freely, and power is distributed.

The work machine side output gear 110 is engaged with a work part primary gear 122 that is slidably fitted to the planting work part output shaft 104 by spline fitting, and the input power is the work part primary. This is transmitted to the planting work unit output shaft 104 via the gear 122 .

At the end of the planting work unit output shaft 104, a torque limiter 113 capable of interrupting transmission of power when a certain load is applied to the planting work machine 20 and power to the planting PTO shaft 107 are provided. A working unit secondary gear 124 for transmission is provided, and power is transmitted to the planting PTO shaft 107 via the torque limiter 113 and the working unit secondary gear 124. The working unit primary gear 122 is shifted by operating the select lever 106, and an appropriate gear ratio is selected by changing the combination of the working machine side output gear 110 and the working unit primary gear 122, and planting. Appropriate power can be transmitted to the PTO shaft 107.

  On the other hand, the traveling gear 111 is meshed with a reduction gear primary gear 112 that is slidably fitted to the reduction gear shaft 103 by spline fitting. The travel side gear 111 has two gears 111a and 111b, and can selectively engage with the two gears 112a and 112b of the primary gear 112 for reduction gear. The power transmitted to the reduction gear primary gear 112 in this way is transmitted to the travel output shaft 105 via the reduction gear shaft 103 and the reduction gear secondary gear 114 located at the center of the shaft. Will be transmitted.

  In the travel output shaft 105, the power input from the secondary gear 114 for the reduction gear is a front wheel drive that transmits the power to the front wheels via the travel output primary gear 115 that is always meshed with the secondary gear 114 for the reduction gear. It is distributed to the front and rear axles by a gear 116 and a rear wheel drive gear 117 that transmits power to the rear wheels.

  A rear wheel travel PTO gear 118 is engaged with a rear wheel drive gear 117 formed at an end portion of the travel output shaft 105 by a bevel gear structure, and further, a rear wheel travel PTO. A rear wheel PTO output gear 119 for transmitting power to the rear axle is located at the rear end of the shaft 108 [FIG. 5- (b)]. This rear wheel PTO output gear 119 is housed in a branch case 120, and another work PTO shaft 121 extends from one end of the branch case 120 via a reduction gear, and is used as an appropriate power source for a work machine. can do.

  As described above, in the transmission according to the conventional example, the main shaft 102, the planting work unit output shaft 104, the reduction gear shaft 103, and the travel output shaft 105 are arranged in parallel, and a plurality of gears are interposed. Therefore, the transmission case and the necessary reduction ratio are obtained, so that the mission case 101 tends to increase in size, and a power transmission loss may occur due to rotation of each shaft and a plurality of gears.

  With respect to the above-described conventional example, a preferred embodiment of the present invention will be described with reference to a development view of the transmission speed change mechanism in the working state shown in FIG. 2. The transmission case 51 of the transmission 5 has no power from the engine. A main shaft 52 input via a step transmission (not shown), a traveling output shaft 53 and a planting work unit output shaft 54 that are arranged in parallel with the main shaft 52 at a predetermined interval are rotatably supported. At the same time, one end of the planting PTO shaft 57 and the rear wheel PTO shaft 58 is supported by the main shaft 52, the traveling output shaft 53, and the planting work unit output shaft 54 so as to be rotatable in a substantially vertical direction.

  A work machine side output gear 60 for transmitting power to the planting work machine 20 and a traveling side gear 61 for transmitting power to the front and rear wheels 14 and 15 are slidable on the main shaft 52 by spline fitting. Deployed and power distribution.

  The work machine side output gear 60 meshes with a work unit primary gear 62 that is slidably fitted to the planting work unit output shaft 54 by spline fitting, and the input power is the work unit primary gear. It is transmitted to the planting work unit output shaft 54 via 62. An idle gear 64 for transmitting a driving force to the front wheel side, which will be described later, is rotatably fitted by a cylindrical shaft 64a at the center of the planting work unit output shaft 54, and the planting work unit output shaft 54 A torque limiter 63 that can cut off the transmission of power when a certain load is applied to the planting machine 20 side, and a working unit for transmitting power to the planting PTO shaft 57 A secondary gear 65 is provided, and power is transmitted to the planting PTO shaft 57 via the torque limiter 63 and the working unit secondary gear 65. In the working unit primary gear 62, the working unit primary gear 62 can be shifted via the link 56 a by operating the select lever 56, and the gear combination of the working unit primary gear 62 and the working machine side output gear 60 is combined. The power can be transmitted to the planting PTO shaft 57 by selecting an appropriate gear ratio.

  On the other hand, the traveling side gear 61 is engaged with a traveling output gear 66 slidably fitted to the traveling output shaft 53 by spline fitting. The traveling gear 61 is formed by integrating two gears 61a and 61b, and the traveling output gear 66 is formed by combining three gears 66a, 66b, and 66c, and these gears are appropriately combined. Thus, the auxiliary transmission unit 67 for adjusting the gear ratio is configured.

  The operation of the subtransmission unit 67 will be described in detail. According to the working state shown in FIG. 2, the small gear 61a of the traveling side gear 61 is engaged with the large gear 66a of the traveling output gear 66, and a large reduction ratio is high. A shaft torque can be obtained. In this meshing state, the gear 66c of the traveling output gear 66 is meshed with the gear 64b constituting the idle gear 64 (shown separated in the drawing), and the power input from the large gear 66a is the gear 66c, It is transmitted to the idle gear 64 via 64b.

  Next, the auxiliary transmission unit 67 in the traveling state will be described. In FIG. 3, the traveling output gear 66 shown in FIG. 2 is shifted to the right of the traveling output shaft 53 by the operation of the select lever 56, and the traveling side described above. The meshing of the small gear 61a of the gear 61 and the large gear 66a of the traveling output gear 66 is released, the large gear 61b of the traveling side gear 61 and the gear 66c of the traveling output gear 66 are meshed, and the traveling The gear 66b of the output gear 66 is engaged with the gear 64b of the idle gear 64 (separated in the drawing), and the power input from the gear 66c is transmitted to the gear 64b via the gear 66b. As described above, the gear 64b of the idle gear 64 is always in contact with either the gear 66b or the gear 66c, regardless of which of the travel side gears 61 is engaged with the travel output gear 66 constituting the auxiliary transmission unit 67. Will be engaged. According to this traveling state, the reduction ratio is set small, and a high rotation shaft output can be obtained.

  Next, the idle gear 64 has a gear 64b supported on one end of a cylindrical shaft 64a that rotatably fits the planting work unit output shaft 54, and a front wheel to the other end of the cylindrical shaft 64a. A gear 64c for transmitting power is supported and rotates as a unit. The gear 64c of the idle gear 64 is always meshed with the ring gear 70a of the differential gear 70 connected to the front wheel drive shaft (separated in the drawing) to transmit the traveling power. In this way, the power input from the traveling output gear 66 is transmitted to the front wheel axle by obtaining the required reduction ratio with the idle gear 64 as the second reduction gear 68.

  On the other hand, the power input from the travel output gear 66 is transmitted to the rear wheel drive gear 69 located at the end of the travel output shaft 53 via the travel output shaft 53 and further transmitted downstream. Power is transmitted to the PTO shaft 58. The rear wheel drive gear 69 is constituted by a bevel gear, and the driving force is converted in a substantially vertical direction in cooperation with the rear wheel PTO input gear 71 located at the end of the meshing rear wheel PTO shaft 58.

  The rear wheel PTO shaft 58 to which power is transmitted via the rear wheel PTO input gear 71 extends from the rear end of the transmission case 51 and passes under the floor of the traveling vehicle body 10 to the rear of the vehicle body. Can be led to the rear axle case 16. Since the rear wheel PTO shaft 58 transmits power to a position separated according to the length of the machine body, it has a universal joint and a support bearing in the middle of the shaft as necessary.

  A first speed reducer 80 is connected to the rear end portion of the rear wheel PTO shaft 58. The first speed reducer 80 transmits a power to the rear axle case 16 and a power source for general-purpose work. And a working PTO 82 that can be used as

  Further, the structure of the first reduction gear 80 will be described with reference to FIG. 4. The rear wheel PTO shaft 58 is guided to the front end of the branch case 81 to the first reduction gear 80, and the rear wheel PTO shaft 58. The shaft 58 extends through the branch case to form a working PTO 82 used for general-purpose work. A rear wheel PTO output gear 83 is formed on the rear wheel PTO shaft 58 in the branch case 81, and the rear wheel PTO output gear 83 is positioned in parallel with the rear wheel PTO shaft 58. The rear wheel drive input gear 85 connected to 84 is meshed with the rear wheel drive shaft 84 to transmit power. A rear wheel drive output gear 86 connected to the rear axle case 16 is provided behind the rear wheel drive shaft 84, and is transmitted to the rear wheel drive shaft 84 by contacting the attachment portion 87 of the branch case 81 with the rear axle case 16. The power thus transmitted is transmitted to the rear wheels via the rear wheel drive output gear 86.

  The first reduction gear 80 can use the branch case 120 for transmitting power to the rear wheel side described in the conventional example of FIG. 5B, and has a conventional branch case structure. Can be diverted without significant changes.

  As described above, the transmission 5 according to the present invention includes the three shafts of the main shaft 52, the traveling output shaft 53, and the planting work unit output shaft 54, and the intermediate transmission shaft 103 required for the transmission 100 according to the conventional example is provided. Since it becomes unnecessary, the transmission case 51 can be kept compact. In addition, the power transmission loss can be reduced by reducing the number of power transmission components.

  Furthermore, since the first reduction gear 80 can divert the branch case 120 according to the conventional example, changes in other power transmission systems accompanying changes in the transmission structure can be minimized.

  Finally, the embodiment according to the present invention described above describes the best mode of the transmission structure that can be used in the transplanter as an embodiment, and the idea of the present invention is widely used in power machines. It is added that it can be diverted to the transmission.

It is a side view of a transplant machine. It is an expanded view of the transmission speed change mechanism in the working state. It is an expanded view of the transmission speed change mechanism in a driving | running | working state. It is a development view of the first reduction gear. It is an expanded view of the transmission speed change mechanism which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 transplanting machine 5 transmission 10 traveling machine body 20 planting work machine 14 front wheel 15 rear wheel 51 transmission case 52 main shaft 53 traveling output shaft 54 planting work part output shaft 57 planting PTO shaft 58 rear wheel PTO shaft 64 idle gear 66 Traveling output gear 67 Sub-transmission unit 68 Second reduction device 80 First reduction device 82 PTO for work

Claims (2)

In a transplanter that transmits engine power to a front wheel, a rear wheel, a planting work part, and other working PTO shafts via a transmission,
The transmission includes a main shaft that is arranged in parallel to each other and that transmits power from the engine, a traveling output shaft, and a planting work unit output shaft.
A plurality of gears of the main shaft and a plurality of gears of the traveling output shaft constitute a sub-transmission unit,
Interposing a first reduction gear between the said in conjunction with the prior Kihashi line output shaft transmission and wheel PTO shaft and rear drive shaft after extending backward,
By an idle gear which is rotatably supported on the the gear before Kihashi line output shaft Planting working unit output shaft constitutes a second reduction gear,
From the traveling output shaft of the transmission, through the second reduction gear to the power transmission to the front wheels as well as power transmission to the rear wheel via the first reduction gear,
Regardless of the shift speed of the sub-transmission unit, the transmission downstream rotation of the shift speed is transmitted to the rear wheel via the first reduction gear and via the second reduction gear. Transmitted to the front wheel,
A transplanter characterized by that. The first reduction gear is arranged in a branch case that transmits power from the rear wheel PTO shaft to the rear wheel drive shaft and transmits power to the other work PTO shaft.
The transplanter according to claim 1.

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