JPH09109707A - Agricultural working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the longitudinal size of an agricultural working machine body to be shortened by inserting the output shaft of a hydraulic continuously variable transmission into a transmission case for storing the transmission from the side surface of the case. SOLUTION: An engine output shaft 20a projecting sideways from the left side surface of an engine 20 and a pump driving shaft 22a projecting sideways to the left from a hydraulic pump 22 are placed in mutually transmissive connection by means of the first belt transmission device 25. Also a hydraulic pump driving shaft 22a and an input shaft 21a projecting sideways from the left side surface of a hydraulic continuously variable transmission 21 are placed in mutually transmissive connection by means of the second belt transmission device 26. Furthermore, the output shaft 21b of the hydraulic continuously variable transmission 21 is projected sideways from the right side surface, and its top end side is inserted into the inside of a transmission case 8. Thereby, the longitudinal size of a machine body can be shortened and the total height of a transmission mechanism can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement of a power transmission mechanism in an agricultural work machine such as a rice transplanter that transmits rotational power of an engine to a transmission via a hydraulic continuously variable transmission.

[0002]

2. Description of the Related Art A rice transplanter equipped with a hydraulic continuously variable transmission (HST) has been put into practical use in order to improve maneuverability when working in a field. The engine is located in the center, the transmission is located in front of it, and the hydraulic continuously variable transmission is arranged between the engine and the transmission case or on the transmission, respectively, and the belt transmission is provided from the engine output shaft to the input shaft of the hydraulic continuously variable transmission. Transmission from the output shaft of the hydraulic continuously variable transmission to the input shaft of the transmission by means of a belt type transmission, and from the output shaft of the engine or the output shaft of the hydraulic continuously variable transmission provided separately to the hydraulic pump. It was configured to be transmitted by a belt type transmission.

[0003]

However, according to the above-described conventional transmission structure, when the hydraulic continuously variable transmission is arranged between the engine and the transmission, the longitudinal length of the vehicle body becomes long, and the hydraulic transmission is not provided on the transmission. When the gear transmission is arranged, the height of the floor surface becomes high and the center of gravity of the airframe becomes high accordingly.
Further, in the conventional transmission structure, at least three belt type transmission devices are required, so that the number of parts such as the rotary shaft, the pulley and the belt is increased, and the structure is complicated.

[0004]

In order to solve the above problems, the present invention has the following arrangement. That is, the agricultural work machine according to the present invention is an agricultural work machine in which the rotational power of the engine is transmitted to the transmission via the hydraulic continuously variable transmission, and the hydraulic continuously variable transmission is used so that the output shaft is oriented in the left-right direction. Of the hydraulic continuously variable transmission, and the output shaft of the hydraulic continuously variable transmission is inserted into a transmission case accommodating the transmission from a side surface of the case.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments shown in the drawings will be described below. The riding rice transplanter 1 is configured by mounting a 4-row planting section 4 on a lifting link device 3 provided at a rear portion of a traveling vehicle body 2. Further, a fertilizer hopper 5a, a fertilizer feeding section 5b, etc. of the fertilizer application device 5 are mounted on the rear portion of the traveling vehicle body.

The traveling vehicle body 2 is a four-wheel drive vehicle and is provided with a pair of left and right front wheels 6, 6 and rear wheels 7, 7 which are drive wheels. Front wheel axle cases 9 and 9 are fixedly provided on the left and right side surfaces of a mission case 8 arranged in the front part of the machine body, and front wheel final cases 10 and 10 are fixedly provided on the outer ends of the front wheel axle case. , Front wheel axles 6a, 6a protruding outward from the lower portion of the front wheel final case
The front wheels 6 and 6 are attached to the. The power in the transmission case 8 is transmitted by the transmission mechanism in the front wheel axle cases 9 and 9 and the front wheel final cases 10 and 10, and the front wheels 6 and 6 are driven to rotate.

Front ends of a pair of left and right main frames 11, 11 are fixed to the rear surface of the mission case 8, and a horizontal frame 12 is fixed to the rear ends of the main frames 11, 11. A rear wheel rolling shaft 13a whose axial center is oriented in the front-rear horizontal direction is fixedly fitted to the left and right central portions of the horizontal frame 12, and the rear wheel frame 13 is allowed to roll freely on the protruding portion of the rear wheel rolling shaft. It is supported. Rear wheel gear cases 14 and 14 are integrally provided at the left and right ends of the rear wheel frame 13, and rear wheel axles 7a and 7a project outward from the outer side of the rear wheel gear case.
Rear wheels 7, 7 are attached to the. The power in the transmission case 8 is transmitted to the left and right rear wheel gear cases 14, 14 by the rear wheel transmission shafts 14a, 14a, and the rear wheels 7, 7 are driven to rotate.

The engine 20 includes mainframes 11 and 11.
It is mounted on top of and is located in the front and rear center of the aircraft. A mission case 8 is located in front of the transmission case 8 and a hydraulic continuously variable transmission 21 is provided by being fixed to the front left surface portion of the mission case 8. A hydraulic pump 22 is provided on the left rear portion of the upper surface of the mission case 8. The engine output shaft 20a projects laterally to the left side surface of the engine 20, and a pump drive shaft 22a that projects laterally left from the engine output shaft 20a and the hydraulic pump 22.
Are connected by a first belt transmission 25. In addition, the hydraulic pump drive shaft 22a and the hydraulic continuously variable transmission 21
The input shaft 21a laterally projecting from the left side surface of the above is transmission-coupled by the second belt transmission device 26. The output shaft 21b of the hydraulic continuously variable transmission 21 projects laterally from the right side surface, and the tip end side thereof is inserted into the mission case 8.

As a result, the rotational power of the engine output shaft 20a is transmitted to the hydraulic pump drive shaft 22a to drive the hydraulic pump 22, and is further transmitted to the hydraulic continuously variable transmission 21 for forward / rearward stepless speed change. It Rotational power after shifting by the hydraulic continuously variable transmission 21 taken out to the output shaft 21b is transmitted to the transmission 8b via the main clutch 8a provided at the entrance of the transmission case 8 to switch between forward and backward movement and a plurality of steps. The speed is switched so that the speed can be changed.

Further, the engine output shaft 20a and the engine 2
The drive shaft 27a of the alternator 27 provided at the rear of 0 is transmission-coupled by the third belt transmission device 28, and the alternator 27 is driven by the rotational power of the engine 20.

As described above, the hydraulic continuously variable transmission 21 is arranged on the side of the transmission case 8, and the output shaft 21b of the hydraulic continuously variable transmission 21 is directly inserted into the transmission case 8 to be transmitted to the transmission 8b. With this configuration, there are the following advantages. (1) The longitudinal length of the machine body can be shortened as compared with the case where the hydraulic continuously variable transmission 21 is arranged in front of or behind the mission case 8. (2) As compared with the case where the hydraulic continuously variable transmission 21 is arranged above the mission case 8, the overall height of the transmission mechanism is lowered,
The position of the floor step 34 described later can be lowered. (3) From the hydraulic continuously variable transmission 21 to the mission case 8
Since there is no need for a belt transmission that transmits to the rotating shaft,
The number of parts such as pulleys and belts can be reduced. (4) Since the transmission system from the engine 20 to the mission case 8 can be collectively arranged on the left side of the machine body, the configuration is simple and the left-right balance is improved. In addition, on the right side of the aircraft,
A first planted transmission shaft 29 that is transmitted from the mission case 8 to the planting unit 4 is provided.

The cockpit 30 is installed on an engine cover 31 which covers the upper side of the engine 20. Its cockpit 3
A steering handle 33 for turning the left and right front wheels 6, 6 is provided above a front cover 32 located in front of 0. An operation panel, various operation levers, various operation pedals, and the like are provided around the front cover 32 and the cockpit 30. L1 is a gear shift lever for switching the transmission 8b, L2 is a traveling lever for operating the swash plate angle of the hydraulic continuously variable transmission 21 to adjust the speed in the forward and backward steps, and P1 is a main lever for operating the main clutch 8a. The clutch pedals P2 and P2 are rear wheel brake pedals that individually brake the left and right rear wheels. Around the lower portions of the engine cover 31 and the front cover 32, a horizontal floor step 34 is provided, on which work such as seedling replenishment can be performed. Elevating steps 35, 35 used for ascending and descending to the floor step 34 are provided on the side of the machine body.

A power steering device 37 is provided in the front cover 32 so that the operating force applied to the steering wheel 33 is amplified and the left and right front wheels 6, 6 are turned. The power steering device 37 has a configuration in which a torque generator 37a amplifies the torque. The torque generator 37a is located at the center of the left and right sides, and a relief valve 37b is arranged on the left side of the torque generator 37a. A pedal shaft 38 is provided in the left-right direction on the front side of the torque generator 37a, the pivot base of the main clutch pedal P1 is rotatably supported on the left end of the pedal shaft 38, and the rear wheel is on the right end. Brake pedals P2, P2
The rotation base is rotatably supported. By providing the relief valve 37b on the left side of the torque generator 37a, a space is created on the right side of the torque generator 37a, so that two rear wheel brake pedals P2, P are provided.
2 can be provided relatively inwardly on the left and right sides, which facilitates the operation. Since the main clutch pedal P1 is a single body, even if it is provided outside the relief valve 37b, it does not move to the outer side in the left-right direction. It should be noted that it is not preferable to provide the relief valve 37b behind the torque generator 37a because it is too close to the legs of the operator, and the pedal shaft 38 is provided in front of the relief valve 37b.
Therefore, the torque generator 37a cannot be provided.

The elevating and lowering link device 3 has a parallel link structure and includes one upper link 40 and a pair of left and right lower links 41,
41 are provided. These links 40, 41, 41 are
The base side thereof is rotatably attached to a link base frame 42 provided upright at the rear end portions of the main frames 11, 11, and a vertical link 43 is connected to the tip side thereof. The vertical link 43 is fitted and supported by a rolling shaft 43a that connects the planting portion 4 in a freely rolling manner. A lifting / lowering hydraulic cylinder 45 is interposed between a support member 45a fixed to the main frames 11, 11 and a tip end of a swing arm 44 integrally formed with the upper link 40, and the cylinder is hydraulically expanded / contracted. Link 40, 41, 4
1 rotates up and down, and the planting part 4 attached to the vertical link 43 moves up and down with a substantially fixed posture.

The planting section 4 has a four-row planting structure and a seedling table 5
0, the planting device 51, ... Are assembled in the transmission case 52 that also serves as a frame, and when each part of the planting unit 4 is driven, the seedlings on the seedling mounting table 50 are sequentially taken one by one, and the seedling intake 62 ,. , And the planting device 51, ... Plants the seedlings in the field. Further, a center float 54 at the center of the left and right and side floats 55, 55 on both the left and right sides thereof are provided on the lower side of the planting section 4 with their front end sides movable up and down. When grounded, part of the weight of the planting part is received by the grounded part, and when the aircraft is advanced with each float grounded, the float slides while leveling the mud.

Next, the structure of each part of the planting part 4 will be described. The seedling placing table 50 is provided so as to be inclined so that the front side is in a higher position, and is reciprocated left and right by a seedling placing table reciprocating mechanism described later. Further, seedling feeding belts 60, ..., Which feed the seedlings downward, are provided at the seedling placing portions of each row of the seedling placing table 50. The seedling feeding belts 60, ... Are driven by a seedling feeding mechanism described later. When the seedling mounting table 50 reciprocates left and right, the seedling receiving frame 6 fixedly provided on the lower end side of the seedling mounting table 6
One seedling is supplied to one seedling inlet 62. When all the seedlings for one horizontal row have been supplied, the seedling feeding belts 60, ... Operate and feed the seedlings one step downward.

The planting device 51 comprises a rotating case 71 which rotates around the planting device mounting shaft 70, and a pair of implanting rods 72, 72 attached to the rotating case.
The planting rod moves up and down so that the tips of the seedling-holding claws 72a, 72a provided in 2 draw a predetermined closed locus,
The seedlings that are supplied to 2, ... Are sandwiched by the seedling sandwiching claws 72a, 72a, which are released at the position where they have penetrated into the topsoil portion and are planted in the field.

In the transmission case 52, a gear case 81 is fixedly connected to the right end portion of the transmission pipe 80 in the left-right direction, and further, the left end portion of the transmission pipe 80 and the right side surface portion of the gear case 81 have front side surfaces of the planted transmission cases 82, 82. Are fixedly connected to each other, and the rolling shaft 43a projects forward from the front surface of the transmission pipe 80 to support the entire planting portion 4 in a freely rolling manner.

The power for driving the planting section 4 is transmitted to the input shaft 85 of the gear case 81 via the planting transmission shaft 29. The rotation of the input shaft 85 is transmitted to the planted drive shaft 88 via the bevel gears 86 and 87. The planted drive shaft 88 penetrates the transmission pipe 80 and the gear case 81, and both ends reach the planted transmission cases 82 and 82. Then, sprocket wheels 90 provided at both ends of the planted drive shaft 88,
90 and the sprocket wheels 91, 91 provided on the planting device mounting shafts 70, 70 rotatably supported at the rear ends of the planting transmission cases 82, 82, and the chain 92,
92 is applied, and the rotation of the planting drive shaft 88 is transmitted to the planting device mounting shafts 70, 70. The sprocket wheels 90, 90 on the side of the planting drive shaft 88 are provided with ridge clutches 94, 94 operated by clutch pins (not shown), respectively. It can be operated. It should be noted that when the furrow clutch 94 is disengaged, the planting devices 71, 71 stop operating at fixed positions.

The gear case 81 has a lead cam shaft 96 which is a drive shaft of the seedling table reciprocating mechanism and the seedling feeding mechanism.
The right end of is inserted. The rotation is transmitted from the planting drive shaft 88 to the lead cam shaft 96 via the counter shaft 97. The transmission part from the planting drive shaft 88 to the counter shaft 97 is configured as a lateral feed transmission of the seedling mounting table.
By operating and selecting the combination of the variable speed gears 98, ..., 99, ... with the shifter 100, the lateral feeding speed of the seedling placing table can be changed in three stages, and the seedling taking amount per stock can be adjusted. Has become. Further, the counter shaft 97 is transmitted to the lead cam shaft 96 by the non-uniform speed transmission gears 101 and 102. The non-uniform speed transmission gears 101, 102 have non-uniform diameters, for example, distorted elliptical shapes, the angular speed ratios of the counter shaft 97 and the lead cam shaft 96 change continuously, and the seedlings are picked up by the planting rod 72. The horizontal feed speed of the mounting table 50 is reduced.

The lead cam shaft 96 has a spiral groove 9 on the outer periphery thereof.
The shaft formed with 6a is rotatably supported by a gear case 81 and a bearing case 82a that is integral with the left planted transmission case 82. The lead metal 10 fixedly attached to the bottom surface of the seedling mount 50 in the groove 96a of the lead cam shaft 96.
When the lead cam shaft 96 rotates, the lead metal 105 of FIG. 5 moves in the axial direction along the groove 96a, whereby the seedling stand 50 is reciprocated left and right. , The seedlings on the seedling mounting table are seedling intakes 62, ...
Are supplied sequentially. Lead metal 105 and gear case 8
1, and between the lead metal 105 and the bearing case 82a, the bellows-shaped cover 106 that covers the lead cam shaft 96,
106 is attached. These covers 106, 106
Expands and contracts as the seedling mount 50 moves left and right.

The end portions 96b and 96b of the lead cam shaft 96 project further than the gear case 81 and the bearing case 82a, and seedling feeding cams 108 and 108 are attached to the end portions. On the other hand, the seedling placing table 50 is provided with seedling feeding arms 109, 109 that engage with the seedling feeding cams 108, 108 when the seedling placing table is located at the end portions of the left and right strokes. The seedling feeding arms 109, 109 are arm rotating shafts 1.
It is attached to 10 so as to rotate integrally. Further, seedling feed actuators 113, 113 interlocking with the swing arms 112, 112 integrated with the arm rotation shaft 110 are provided, and the concave tip portions 113a, 113a of the seedling feed actuators are provided.
, Around which the seedling feed belts 60, ... Are wound, the shafts (seedling feed drive shafts) 115, 115 of the seedling feed rollers 60a ,.
Ratchet arms 116, 116 rotatably fitted to the
The tip end of is engaged. Then, the ratchet claw 1 attached to the ratchet arm 116, 116
17, 117 engage with the teeth of the ratchet wheels 118, 118 that rotate integrally with the seedling feeding drive shafts 115, 115,
The seedling feed drive shafts 115, 115 are rotated only when the ratchet arms 116, 116 rotate in a fixed direction.

As a result, when the seedling mounting table 50 reaches the end of the left and right stroke, the seedling feeding cam 108 is engaged with the seedling feeding arm 109 on that side, and the arm rotating shaft 110 is rotated.
Further, the ratchet arm 11 is pushed by the seedling feeding operation bodies 113, 113 which are interlocked with the rotation of the arm rotation shaft 110.
6, 116 rotate to move the seedling feeding belt 60, ... In a predetermined direction by a predetermined amount.

Further, the seedling feeding actuating members 113, 113 are engaged with seedling feeding stop cams 120, 120. The seedling feeding stop cams 120, 120 are used for the ridge clutches 94, 9
Ridge clutch lever 121, 121 for turning 4 in and out
When the ridge clutch lever 121 is operated to the disengaged position (shown by the chain line in the figure), the seed feeding mechanism 113 is pushed by the stop cam 120 when the ridge clutch lever 121 is operated to the disengaged position. It rotates (indicated by a chain line in the figure), and the seedling feeding actuator 113 and the ratchet arm 116 are rotated.
Is disengaged. Therefore, when the two row planting devices 51, 51 are stopped, the seedling feeding of the same row is also stopped in association with it.

As described above, the lead cam shaft 96 is provided outside the gear case 81, the groove 96a for reciprocating the seedling mounting table is formed in the center of the lead cam shaft 96 on the left and right, and the seed cams are formed on the left and right ends of the lead cam shaft 96. The feed cams 108, 108 are attached. In this way, since the common shaft (lead cam shaft) 96 drives the seedling table reciprocating mechanism and the seedling feeding mechanism, the number of parts can be reduced and the structure is simplified. Further, since the lead metal 105 is directly fixed to the seedling placing table 50, the lead cam shaft 96 can be provided close to the seedling placing table 50, and the planting part 4 is located at the front position, and the weight balance is achieved. It is good.

By the way, the groove 96 of the lead cam shaft 96 is formed.
The portion a is covered by the stretchable covers 106, 106, but since this cover has a certain length in the left-right direction even in the most contracted state, the covers 106, 106 are stored on both the left and right sides of the groove 96a. A space for this is required, and the distance between the outer ends of the left and right covers 106, 106 is about two widths. Therefore, the seedling feeding cams 108 provided at the left and right ends of the lead cam shaft 96,
Numeral 108 is outside the left-right center of each seedling feeding drive shaft 115, 115, and the seedling feeding cams 108, 108 directly drive the seedling feeding drive shafts 115, 115 (seedling feeding drive shaft 11).
5,115 cannot be provided with seedling feeding arms 119 and 119). Therefore, the seedling feeding arm 11 is attached to the arm rotating shaft 110 provided in parallel with the seedling feeding driving shafts 115, 115.
9, 119 are attached, and the seedling feeding drive shafts 115, 115 are driven via the arm rotation shaft 110. Thus, the seedling feeding drive shafts 115, 115 can be separated into two rows, and when the ridge clutch 94 is disengaged, the seedling feeding of the same row can be stopped in association with it.

The fertilizer applicator 5 is provided with a fertilizer tank 5a for storing fertilizer and a fertilizer feeding section 5b for sequentially feeding the fertilizer in the fertilizer tank downward by a fixed amount at the rear portion of the traveling vehicle body 1 and the fertilizer feeding section. Fertilizer delivered from the floats 54, 5 through flexible fertilizing hoses 5c ,.
It is adapted to be guided to the fertilizer application body 5d attached to 5, 55. On the front side of the fertilizer application bodies 5d ..., Grooving tools 5e ... Forming grooves for fertilization are provided near the side portions of the planting strip. The fertilizer is transported in the fertilizer application hoses 5c, ... By the compressed air blown from the blower 5f. This blower 5f
Is driven by a motor 5g that is rotated by electricity generated by the alternator 27.

[0028]

As described above, in the agricultural working machine according to the present invention, the hydraulic continuously variable transmission is arranged laterally of the transmission so that the output shaft faces the left and right directions. By configuring the output shaft of the device to be inserted into the transmission case that houses the transmission from the side of the case, the front-rear length of the machine can be shortened and the overall height of the transmission mechanism can be reduced, and the rotation can be achieved. The number of parts such as shafts, pulleys, and belts has been reduced, and the structure of the transmission mechanism has been simplified.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a plan view of the riding rice transplanter.

FIG. 3 is a plan view in which a part of a traveling vehicle body is omitted.

FIG. 4 is a front view of the inside of a front cover.

FIG. 5 is a side view of the inside of the front cover.

FIG. 6 is a sectional view of a transmission case.

FIG. 7 is a diagram showing the configurations of a seedling table reciprocating mechanism and a seedling feeding mechanism.

FIG. 8 is a side view of the lower part of the seedling table.

[Explanation of symbols]

 1 Passenger rice transplanter 2 Traveling car body 3 Lifting link device 4 Planting part 5 Fertilizer application 8 Mission case 8b Transmission 20 Engine 21 Hydraulic continuously variable transmission 21b Output shaft of hydraulic continuously variable transmission 50 Seedling table 51 Planting device 52 transmission case

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsu Nomura No. 1 Hachikura, Tobe Town, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] 1. In an agricultural work machine that transmits the rotational power of an engine to a transmission via a hydraulic continuously variable transmission, the hydraulic continuously variable transmission is arranged laterally of the transmission such that the output shaft faces the left and right directions. An agricultural working machine is characterized in that the output shaft of the hydraulic continuously variable transmission is inserted into a mission case accommodating the transmission from a side surface of the case.