JPH0669787B2 - The traveling case of the traveling vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mission case of a traveling vehicle such as a paddy farming machine.

[Prior Art] A transmission device is mainly incorporated in a mission case of a paddy field agricultural working machine such as a rice transplanter, and a steering device is assembled separately from the transmission device.

[Problems to be Solved by the Invention] However, the above-described conventional traveling vehicle in which the transmission and the steering device are separately assembled has a problem in that the structure of this portion is complicated and assembly is difficult. .

[Means for Solving Problems] In order to solve the above problems, the present invention has the following configuration.

That is, in the mission case of the traveling vehicle according to the present invention, the opening that opens above the mission case incorporating the transmission and the steering device is covered with a mission cover that allows the steering shaft and the change lever to be assembled together. It is characterized by becoming.

[Operation] Since the steering shaft and the change lever can be assembled together in a single mission case cover, the structure is simple and the assembly is easy.

[Embodiment] FIG. 1 and subsequent drawings show an embodiment of the present invention. A traveling vehicle 1 in the illustrated example is a paddy field agricultural working machine, and a self-propelled towing vehicle 2 is used as a working device. The device 3 is attached and used as a rice transplanter as a whole. As the working device, a seeding device, a fertilizer applying device, a chemical spraying device, and the like can be used in addition to the rice transplanting device.

The towing vehicle 2 includes a mission case 5, a laterally-viewing U-shaped connecting frame 6 located at the rear part thereof, and a pipe-shaped main frame 7 provided at the front and rear, and inside the connecting frame 6, left and right front parts are provided. A pivot support portion 12 for rotatably supporting the differential case 10 integrated with the axle cases 9 and 9 with respect to the main frame 7 is provided, and a rear axle case is provided at a rear end portion of the main frame 7.
11 is installed. Then, front wheel supporting turning cases 14 and 14 having front wheels 13 and 13 attached to the lower ends thereof are provided at the end portions of the front axle cases 9 and 9 so as to be capable of turning, and the gear cases are provided at both left and right end portions of the rear axle case 11. 16, 16 are provided, and rear wheels 17, 17 are pivotally supported on the lower ends of the gear cases 16, 16.

The engine 20 is installed on an engine base 21 provided slightly rearward of the middle portion of the main frame 7. An output shaft 23 projects from the rear of the engine 20, and a belt 25 is stretched from a pulley 23a of the output shaft 23 to a pulley 24a of a primary transmission shaft 24 provided on the right side of the engine. . A rear end portion of the primary transmission shaft 24 is drawn into the hydraulic pump 27 as a drive shaft of the hydraulic pump 27, and a pulley 24b is attached to a front end portion of the primary transmission shaft 24 which extends to the vicinity of the front end portion of the machine body. A belt 28 is stretched between the pulley 24b and the pulley 29a of the transmission case 5.

The transmission case 5 has a plurality of speed change gears and shafts 29, 31, 32, 33, 34 inside, and the pulley 29a is fitted to the protruding portion of the pulley shaft 29. The primary power transmitted to the pulley shaft 29 is speed-changed via the intermediate shafts 31 and 32 and the gear train, and is transmitted to the planted output shaft 33 and the traveling output shaft 34, respectively. Reference numeral 35 in the figure denotes a clutch lever, which is a pulley.
The main clutch 30 built in 29a is adapted to be engaged and disengaged. 36 is a gear change lever,
By changing this, change arms 37a, 38a
Moves, and the sliding cylinders 37, 38 of the pulley shaft 29 move along the shaft, so that the meshing gears of the pulley shaft 29 and the intermediate shafts 31, 32 are switched. Reference numeral 40 is a stock interval switching lever, and by operating this lever, the sliding cylinder 41 of the planted output shaft 33 moves along the shaft, and the gear ratio of the intermediate shaft 31 and the planted sliding cylinder 41 is switched. A steering shaft 43 is connected to the pitman arm 160 and steering devices such as left and right tie rods 161, 161. Note that FIG. 5 is a cross-sectional view showing the mission case 5 in a developed manner. In the figure, the holding portion 5a of the primary transmission shaft 24 is shown separated from the mission case 5, but in reality, the holding portion is shown. 5a is integral with the mission case 5.

The planted output shaft 33 is a secondary transmission shaft that passes through the left side of the engine 20 and is connected to a clutch case 44 provided at the rear end of the aircraft.
45 is connected. PTO shaft 46 from clutch case 44
Is projected rearward, and a shaft 47 is connected to the PTO shaft via a universal joint. The power for the working device transmitted from the secondary transmission shaft 45 to the PTO shaft 46 is transmitted to the seedling planting transmission case 130 of the rice transplanter via the shaft 47.

On the other hand, the traveling output shaft 34 is drawn into the differential case 10, and the differential device 50 in the case is rotated by the gear 48 fitted to the rear end thereof. The differential device 50 includes a primary bevel gear 53, 53 ′ in a container 52 shaped as a gear in which a part of the outer surface 52 a meshes with the gear 48 and a gear 49 attached to the front end of a propeller shaft 80 described later. It is installed on the axis passing through the center of the
Secondary bevel gears 54, 54 'meshing with 3, 53' are provided on an axis orthogonal to the central axis of the container. This diff device 50 supports both ends of a container 52 on the diff case 10 by bearings 56, 56, and attaches left and right front axles 57, 57 'to the secondary bevel gears 54, 54', respectively. There is. If there is a difference in the loads applied to the left and right front axles 57, 57 'during turning, etc., the ratio of the driving torque transmitted to both axles will be appropriately changed depending on the load amount by the function of the differential device 50. , So that you can run smoothly.

The diff device 50 also includes a lock device 60 for stopping the diff function and transmitting the same amount of rotational driving force to the left and right front axles. Lock device 60 is a container
A lock claw receiver 61 formed at an end portion of 52, a lock tool 62 having a lock claw 62a engaging with the lock claw receiver 61 and slidably fitted to a front axle 57 ', and the lock tool.
It comprises a spring 63 that constantly urges 62 in the direction opposite to the lock claw receiver 61, and a moving means 64 that moves the lock 62 toward the container 52. Lock claw receiver 61 and lock claw always
The diff device is functioning normally because 62a is in the disengaged state, but when the lock tool 62 is moved toward the container 52 by the moving means, the lock claw 62a engages with the lock claw receiver 61, and the container 5
The rotation of 2 is directly transmitted to the front axle 57 '. At the same time, the same rotational force is transmitted to the other front axle 57.

A final case 65 is provided at the outer end of the front axle case 9, and a rotary case 14 is rotatably provided below the final case 65. The front axle 57 (57 ') is connected to the front wheel shaft 67 via a vertical shaft 66 in the final case 65 and the rotating case 14 and a gear train. Outer end portions of the tie rods 161 and 161 are connected to the left and right rotating cases 14 and 14, respectively, so that the tie rods 161 and 161 rotate in the same direction and at the same angle when the handle is operated.

The propeller shaft 80 is a secondary power transmission shaft for traveling from the differential case to the rear axle, and is provided inside the main frame 7. The rotating cylindrical body 84 supported by the bearings 83, 83 on the rear axle case 11 has teeth 85 on the inner surface and a collar-shaped gear portion 86 is formed on the outer surface. The gear portion 86 has a propeller shaft 80. The gear 88 attached to the rear end of the rear wheel meshes with each other to transmit the rotational force. The ends 90a, 90a 'of the left and right rear axles 90, 90' are inserted into the hollow inside of the rotary cylinder 84. The end portions 90a, 90a 'are formed as spline shafts, and side clutches 89, 89' are provided in this portion. That is, clutch members 91, 91 'that mesh with the teeth 85 of the rotary cylinder 84 are slidably fitted to the outer surface of the spline shaft. The clutch member 91 (91 ') is connected to the operating portion 93 by the connecting member 92. When the operating portion 93 is operated by the shifter 95, the clutch member 91 moves along the rear axle end 90a, and the rotating tubular body 84 The side clutch 89 is configured to be disengaged by releasing the meshing relationship between the side clutch 89 and the clutch member 91. Further, when the shifter 95 is operated to disengage the side clutches 89 and 89 ', the plate brake 97 is automatically applied. In addition, such a side clutch 8
Instead of providing 9,89 ', a diff device and a diff lock device similar to those on the front wheel side may be provided. Rear axle 90
(90 ') is connected to the rear wheel shaft 99 via the shaft 98 in the gear case 16 and a plurality of reduction gears.

FIGS. 7 and 8 show the structure of the center pivot part that supports the front axle case. The front axle cases 9 and 9 support the mission case 5 with the pivot part 10a of the differential case 10 integrated therewith. By being fitted to the portion 5b via the needle bearing 10b, it is rotatably supported up and down. However, in the tow vehicle 2 shown in the figure, the front axle cases 9 and 9 are prevented from inclining by a predetermined angle or more. As means for restricting, stopper portions 101, 101 protruding leftward and rightward are provided on the upper portion of the connecting frame 6, and convex portions 102, 102 are provided just below the stop portions 101, 101 of the differential case 10.
Is provided. As described above, by providing the stopper members (102, 102) on the connecting frame 6 and the differential case 10 which form the center pivot portion 10a, the structure of the tilt restricting mechanism of the front axle becomes simple, and it is also preferable in terms of accuracy. Has become. The stoppers 101, 10
If the distance between 1 and the convex portions 102, 102 can be adjusted, the regulation tilt angle of the front axle can be arbitrarily changed, which is more preferable.

The towing vehicle 2 is configured by covering the traveling section and the power system section configured as described above with the body 110. Body 110 of this tow vehicle 2
Consists of a substantially flat floor portion 111, a box portion 102 that covers the upper portion of the engine 20, and a control console portion 113 that projects upward from the front end portion of the machine body. The box portion 112 is provided with a cockpit 115 at the center and an operation lever of the rice transplanting device 3 such as the planting interval adjusting lever 40 on the side of the cockpit 115. Further, the control console 113 is provided with a handle 116 attached to the steering shaft 43 and a change lever 36.

Further, a parallel link device 120 for pulling the work device is provided at the rear end of the towing vehicle 2. This parallel link device 1
Reference numeral 20 denotes a rear view gate-shaped frame body 122 fixed to the rear axle case 11, one upper link 123 and two lower links 124 and 124 supported by the frame body, and the rear links of the upper and lower links. Attached to the end and attached to the lower end of the working device 125a
And a connecting frame 125 having The upper link 123 has a hydraulic cylinder 127 whose base is pivotally attached to the rear axle case 11.
Are connected to each other, and the parallel link device 120 can be vertically rotated by expanding and contracting the hydraulic cylinder 127.

Next, the rice planting device 3 will be described. The rice planting device 3 includes a seedling tank 131 that is installed above the transmission case 130 so that the front side is inclined, and a planting claw 132a at the tip. The planting rod 132 is provided, which takes out the seedlings one by one from the seedbed placed on the seedling tank 131 while moving up and down while drawing a predetermined trajectory, and planting them in the field. A center float 134 and a pair of left and right side floats 135, 135 are pivotally mounted on the lower side of the transmission case 130 so as to be vertically rotatable. A detection wire 138 connected to a hydraulic valve 137 for vertical movement detection is provided at the front of the center float 134, and when the float moves upward, the hydraulic cylinder 12
7 is extended to lift the rice transplanter 3, and when the float moves downward, the hydraulic cylinder 127 is contracted to lower the rice transplanter 3. The rice transplanter 3 is attached by rotatably connecting the front end of the transmission case 130 to the connecting tool 125a, is towed by the traveling of the towing vehicle 2, and the power is transmitted from the PTO shaft 46 of the towing vehicle 2. To be

Next, the structure of the mission case 5 of the traveling vehicle 1 will be described. The mission case 5 is composed of a mission case main body 150 that opens upward and a mission cover 152 that covers the opening 151. Inside the main body 150, as described above, the transmission including a plurality of gears and shafts is housed. On the other hand, a steering shaft 43 and a change lever 36 are assembled to the mission cover 152. Steering shaft
43 is rotatably supported by a cup-shaped support portion 153, and a steering gear 154 is attached to the lower end thereof, and the rotation of the steering shaft 43 is transmitted from this gear to a drive shaft 157 via an intermediate gear 155. It is supposed to be. A pitman arm 160 provided at the lower end of the drive shaft 157 is connected to a tie rod arm 162 of the rotating case 14 via a tie rod 161. On the other hand, the change lever 36 is supported by a tubular support portion 165 protruding from the mission cover 152 side by side with the steering shaft support portion 153 so as to be tiltable in the front-rear direction and the left-right direction. A shifter for switching relationships is provided.

Further, the structure of the pivot bearing portion of the differential case 10 provided in the U-shaped connecting frame 6 of the traveling vehicle of the illustrated example will be described.
The O-rings 172 and 172 are interposed in the fitting portion between the shaft portion 171 of the differential case 10 and the shaft portion 171, and the lubricating oil inside the differential case and the front axle is supported by the shaft portion 171 in the space between both O-rings. An oil hole 175 is formed to guide the sliding portion with respect to the portion 170. Therefore, it is not necessary to supply a special lubricating oil to the sliding portion, and it is possible to effectively prevent seizure of the support portion.

[Effects of the Invention] As is clear from the above description, the mission case of the traveling vehicle according to the present invention can be assembled in a single cover with the steering shaft and the change lever, and therefore is structurally simple and compact as a whole. It became a thing. Since the cover covers the upper opening of the mission case, the assembly work and maintenance inside the mission case are easy even when the steering shaft and the change lever are assembled together.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a traveling vehicle according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a plan view showing a transmission system thereof. Further, FIG. 4 is a cross-sectional view of the mission case seen from the front, FIG. 5 is a cross-sectional view showing the development of the same, FIG. 6 is a cross-sectional view of the rear axle peripheral portion, and FIGS. It is the top view and front view of a center pivot part. 1 ... traveling vehicle, 2 ... passenger towing vehicle, 3 ... rice transplanter (working device), 5 ... mission case, 6 ... connecting frame, 7 ... main frame, 20 ... engine, 24 ...
… Primary transmission shaft, 36 …… Change lever, 43 …… Steering shaft, 45 …… Secondary transmission shaft, 50 …… Differential device, 5
7,57 ′ …… Front axle, 80 …… Propeller shaft, 90,90 ′ …… Rear axle, 115 …… Pilot seat, 152…
… Mission cover

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seike Rihaku No. 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Pref.Iseki Agricultural Machinery Co., Ltd. (72) Inventor Hiroyuki Niiyama No. 1 Yakura, Ito-gun, Ehime Prefecture (72) Inventor Hideo Iseki, No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture, Izeki Agricultural Machinery Co., Ltd. (56) Reference JP 56-137810 (JP, A) ) Actual public Sho 55-10206 (JP, Y2)

Claims (1)

[Claims] 1. A mission case for a traveling vehicle in which an opening that opens above a mission case incorporating a transmission and a steering device is covered with a mission cover to which a steering shaft and a change lever can be assembled together.