JP2600971B2 - Agricultural traveling body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a traveling vehicle body of an agricultural work machine used by mounting a work machine portion such as a rice transplanter.

2. Description of the Related Art There is a traveling body of an agricultural work machine provided with a belt-type auxiliary transmission that also functions as a clutch during transmission from an engine to a transmission case. Also, a mid-mounted engine type in which a front wheel is located on the side of the transmission case and a rear wheel is located behind the transmission, and an engine is provided above an intermediate portion between a front wheel axle supporting the front wheel and a rear wheel axle supporting the rear wheel. In a traveling vehicle, there has been considered a vehicle in which the auxiliary transmission is provided in a front-rear space between an engine and a transmission case or in front of a transmission case so that a belt direction is perpendicular to a traveling direction.

In an agricultural traveling vehicle body, generally, when the brake is applied to the rear wheel on the inside of the turn and the vehicle turns in a small turn, the turning radius at the front wheel position on the inside of the turn is smaller than the turning radius at the front wheel position on the outside of the turn. The turning angle of the front wheel inside the turning is set to be larger than the turning angle of the front wheel outside the turning.

[Problems to be Solved by the Invention] However, in a mid-mounted engine type traveling vehicle body in which a belt-type auxiliary transmission is provided in a front-rear space between the engine and the transmission case, the distance between the engine and the transmission case must be widened. However, there has been a problem that the total length of the vehicle body is increased and the weight balance of the vehicle body is not preferable. In addition, the one with a belt-type auxiliary transmission located in front of the transmission case has a large projecting amount at the front end of the vehicle body, which also increases the overall length of the vehicle body and requires a long transmission shaft to transmit power from the engine to the auxiliary transmission. There is a problem that.

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

That is, in the agricultural traveling vehicle body according to the present invention, the front wheel is located on the side of the transmission case, and the rear wheel is located behind the front wheel, and the engine is located at an intermediate portion between the front wheel shaft supporting the front wheel and the rear wheel shaft supporting the rear wheel. In the agricultural traveling body provided, a counter shaft parallel to these two axes is provided at a space between an engine output shaft protruding from the side of the engine and a transmission input shaft protruding from the side of the transmission case. Of the second transmission belt composed of a plurality of belts having different transmission gear ratios, which are transmitted from the transmission shaft to the counter shaft by the first transmission belt and stretched between the counter shaft and the transmission input shaft between the two shafts. The first transmission belt is positioned closer to the left and right center of the vehicle body than the second transmission belt and closer to the rear side than the steering rotation center of the front wheels. It is characterized in that provided respectively on the front side nearer the front wheel steering pivot center and.

[Operation] The transmission is performed by an arbitrary one of the second transmission belts including a plurality of belts having different transmission gear ratios stretched from the counter shaft to the transmission input shaft between the two shafts. It is possible to dispose the subtransmission at this point. As described above, when the auxiliary transmission is provided on the side of the engine and the transmission case, the overall length of the vehicle body can be reduced as compared with the case where the auxiliary transmission is disposed at the front and rear intervals of the engine and the transmission case. Further, since the auxiliary transmission is provided relatively at the front of the vehicle body, the weight balance of the entire vehicle body is improved.

As described above, in this type of agricultural traveling vehicle body, the turning angle of the front wheels that are inside when turning is set to be larger than the turning angle of the front wheels that are outside the turn. On the left and right inside of the car body than the transmission belt of
Since the second transmission belt is provided rearward with respect to the steering rotation center of the front wheels, and the second transmission belt is provided further forward than the steering rotation center of the front wheels, the second transmission belt is provided on the side where these transmission belts are provided. When the front wheel is turned outward, the front wheel is turned sufficiently large, and a good small turn can be made.

[Embodiment] An embodiment shown in the drawings will be described below.

The illustrated agricultural work machine 1 has a rice transplanting device 4 attached as a working machine portion to a link device 3 provided at a rear portion of a four-wheel traveling vehicle body 2, and is a riding rice transplanter as a whole.

The traveling body 2 is a transmission case provided at the front of the body.
A body frame is constituted by 10 and a vertical frame 11 extending rearward from the back of the transmission case, and an engine 14 is mounted on an engine stand 13 provided at an intermediate portion of the vertical frame 11.
Is installed. The third on the back of mission case 10
As shown in the figure, a hydraulic pump 15 is integrally mounted. Final case on the rear side of mission case 10
20, 20 are provided, and front wheels 22, 22 are pivotally supported by front wheel support cases 21, 21, which are attached to the final case so as to be able to turn. A rolling rod 25 is supported at the rear end of the vertical frame 11 so as to freely roll in a plane perpendicular to the traveling direction, and a rear case is provided at both left and right ends of the rolling rod.
26, 26 are provided, on which rear wheels 27, 27 are pivotally supported.
The engine 14 is located at an intermediate portion between the front wheel shaft 22a and the rear wheel shaft 27a in a side view.

The engine 14 is mounted horizontally and its output shaft 30
Is provided on the left side. The drive shaft (counter shaft) 31 of the hydraulic pump and the input shaft 32 of the transmission are also provided on the left side. The rotational power of the engine output shaft 30 is the first
The transmission is transmitted to the counter shaft 31 via the transmission belt 34, and further transmitted from the counter shaft to the transmission input shaft 32 via the transmission belt type auxiliary transmission 35 also serving as a clutch. The auxiliary transmission 35 is a pulley 36 having the same diameter as the counter shaft.
The second transmission belts 38a and 38b are respectively stretched between the pulleys 37a and 37b of the transmission input shaft and the belts 38a and 38b.
8b) is tensioned to perform low-speed or high-speed transmission, or both belts are slackened together to switch to the disengaged clutch state in which transmission is stopped. The switching operation of the auxiliary transmission 35 is performed by a work lever 121 and a clutch pedal 122 described later.

As shown by the chain line in FIG. 3, even when turning with the same radius of rotation, the turning angle of the front wheel 22 is larger in the outward direction A than in the inward direction B (θa> θb). That is, in the traveling vehicle body 2 of the embodiment, the rear end portion of the left front wheel 22 bites largely inside when turning left. At this time, in order to avoid interference with the rear end of the left front wheel, the first transmission belt 34 is
Of the counter shaft 31 so that the rear end of the left front wheel 22 wraps around the rear of the second power transmission belts 38a, 38b when turning left with the minimum turning radius. The position has been set.

As shown in FIG. 4, the transmission case 10 includes a pair of left and right main casing members divided by a division surface along the traveling direction.
40, 41 and a sub casing member 42 attached to the side of the right main casing member 41 are joined and integrated with bolts or the like, and the transmission input shaft 32 and the side are formed in a space formed by the pair of main casing members 40, 41. Clutch shaft 44, intermediate shaft
45, rear wheel drive shafts 46, 46 and a planting drive shaft 47 are supported in parallel to the left and right, a front differential device 48 is provided at the rear of the space, and planting is performed in a space formed by the sub-casing member 42. A transmission shaft 49 is supported along the traveling direction.

A gear cylinder 51 having gears G1 and G2 and a gear cylinder 52 having gears G3 and G4 are slidably fitted to the input shaft 32, respectively. The side clutch shaft 44 has the gear G1
A fixed cylinder 53 formed with a gear G5 meshing with the gear G6, a gear G6 meshing with the gear G2, and a pair of inner gears G7, G7 on both sides is fitted, and meshes with the inner gears G7, G7. Sliding cylinders 54, 54 with outer gears G8, G8 formed at the inner end are springs
They are fitted in a state of being urged inward by 55,55. A rotating gear cylinder 58 having gears G9 and G10 formed on the outer peripheral portion is rotatably supported by bearings 57 and 57 on the planting drive shaft 47, and is fixed to the shaft so that the gears G11 and G12 are fixed.
A gear cylinder 59 formed with a hole is attached. The gear G9 of the rotary gear barrel 58 is always meshed with the gear G5 of the fixed barrel 53. A gear change is performed by sliding the gear cylinder 51 with the main shift shifter 61, and when G1 and G5 mesh, a low working speed,
When G2 and G6 mesh, the running speed becomes high, and when G1 and G10 mesh, the running speed becomes reverse. This main shift operation is performed by the main shift lever 12
Perform with 0. Further, the gear cylinder 52 is slid by the inter-stock shift shifter 62 to perform inter-stock shift, and G3 and G11 mesh with each other.
When G12 meshes with the planting drive shaft 4 from the input shaft 32
The gear ratio in the transmission to 7 is slightly different.

The outer end of the sliding cylinder 54 has a flange shape, and a brake shoe 64 is attached to the outer peripheral surface thereof. A brake drum 65 is fixed to the casing side facing the brake shoe 64. By operating the side clutch lever (not shown) to move the sliding cylinders 54, 54 outward, the inner gears G7, G7 disengage from the outer gears G8, G8,
The transmission from the input shaft 32 to the side clutch shaft 44 is interrupted, and the brake shoes 64, 64 are moved to the brake drums 65, 65.
And the rotation of the side clutch shaft 44 is forcibly stopped.

The rear wheel drive shafts 46, 46 are supported so as to rotate independently of each other, and each of the gears G1 meshes with the outer gear G8.
3 and the bevel gear G15 meshing with the bevel gear G14 of the longitudinal axis 66
Are attached separately. The rear end of the longitudinal axis 66 projects to the rear of the transmission case 10, and rotational force is transmitted from the rear end to the longitudinal axis 68 of the rear case 26 via the rear wheel transmission shaft 67. The left and right rear wheel transmission shafts 67, 67 and the longitudinal axes 66, 68,... Are connected by universal joints 69,. The rear wheel transmission shafts 67, 67 are horizontally disposed below the engine 10, and are provided in an eight-shape in a plan view, with the distance between them being smaller toward the front. The arrangement of the rear wheel transmission shafts 67, 67 is also for avoiding interference between the rear end of the inward front wheel and the front portion of the rear wheel transmission shaft during turning.

The intermediate shaft 45 is provided with a gear G16 that meshes with the gear G6 and a gear G17 that meshes with the gear G18 of the front differential device 48. The rotation of the side clutch shaft 44 is transmitted to the front differential device 48.

The front differential device 48 includes a pot-shaped container 70 having a hollow inside, and a primary bevel gear 71 and secondary bevel gears 72, 72 are housed in the container in such a manner that they mesh with each other. The secondary bevel gears 72, 72 are attached to left and right front axles 74, 74 projecting laterally from the container 70. If a difference occurs in the load applied to the left and right rear axles 74 during turning or the like, the ratio of the driving force transmitted to both axles is appropriately changed according to the load amount. In addition, in the figure
Reference numeral 75 denotes a differential lock member which is slidably and non-rotatably fitted to the square rod portion of the front axle.When the pawl 75a of the differential lock member is engaged with the pawl 70a of the container 70, the differential action is stopped, and The ratio of the driving force transmitted to the front axles 74, 74 is always equal.

The rotation of the planting drive shaft 47 is performed by a rotating body 77 attached to the input shaft 32.
And is transmitted to the planting transmission shaft 49 via. A sliding cylinder 78 formed with gears G19 and G20 is slidably fitted to the planting drive shaft 47, and a rotating body 77 is formed with a gear G21 meshing with G19 and a gear G22 meshing with G20. And shifter 79 with sliding cylinder 78
By driving the gears to switch the meshing of the gears, the inter-gear shift can be performed here. The planting transmission shaft 49 is provided with a safety clutch 80 and a planting clutch 81.

The safety clutch 80 is rotatably fitted to a fixed position of the planting transmission shaft 49, and a primary claw holder 83 having a bevel gear G24 meshed with a bevel gear G23 of a rotating body formed on an outer peripheral portion.
And a secondary claw holder 84 that is non-rotatably and slidably fitted to the planting transmission shaft 49, and a spring 85 that urges the secondary claw holder toward the primary claw holder 83. Become. Normally, the two claw holders 83 and 84 are engaged by the action of the spring 85, and the transmission is performed from the rotating body 77 to the planting transmission shaft 49, but when a certain force or more is applied to the working portion, the force of the spring 85 is reduced. In contrast, the nail holders 83 and 84 are disengaged from each other, and the transmission is stopped.

Further, the planting clutch 81 is non-rotatably and slidably attached to the planting transmission shaft 49, and has a tapered outer peripheral surface. And a spring 89 for urging the secondary claw holder 88 in the direction of the primary claw holder 87. Normally, the two claw holders 87 and 88 are in mesh with each other, so transmission is performed from the primary claw holder 87 to the secondary claw holder 88. When it is pushed into the body 88, its tip engages the tapered surface, and the two claw holders are at an angle at which the secondary claw holder 88 is at a predetermined position.
The transmission of 87,88 is canceled. The clutch pin 90 is driven in conjunction with the operation of the work lever 121 described later. The link device 3 includes a support frame 100 erected at the rear end of the frame 6.
An upper link 101 and a lower link 102 are rotatably supported on the upper and lower links, and a connecting frame 104 is attached to the rear ends of these upper and lower links. Then, the rice transplanting device 4 is mounted on the connection frame 104 in a rollable manner. Further, a hydraulic cylinder 105 for driving a link device is pivotally mounted below the engine 10.
The lower end of a swing arm 106 that is suspended from the base of the upper link 101 is connected to the rod of the hydraulic cylinder. When the hydraulic cylinder 105 is expanded and contracted by driving the hydraulic valve 107 provided in the rice transplanting device 4 which is a working machine portion, the connecting frame 104 is moved up and down while being held in a substantially constant posture, and the planting device attached thereto is mounted. 4 is raised and lowered.

A body 110 is placed over these chassis, and a cockpit 112 is installed above the engine room 111. Also,
A steering post 114 is provided upright at the front of the vehicle body, and an operation box 115 to which various switches and instruments are attached is provided at the upper end thereof. This operation box 1
A steering handle 118 is attached to an upper end of a steering shaft 117 projecting from the center of the upper surface of the upper surface 15. The steering shaft 117 projects upward from the front end of the transmission case 10. The main shift lever 120 and the work lever 12 are located on both left and right sides of the steering
1, a clutch pedal 122 and the like are provided on the floor portion.

5 to 7 are views showing a switching mechanism of the auxiliary transmission 35, the planting clutch 81, and the hydraulic valve 107. The work lever 121 is mounted on a cam shaft 130 that is supported horizontally, and is configured to rotate back and forth along lever operation positions I to V ′ shown in FIGS. 8 and 9. For driving the switching mechanism, the auxiliary transmission operation cams 131a and 131 are provided at the left end of the cam shaft 130.
1b has a planting operation cam 133 and a hydraulic operation cam 134 attached to the right end, respectively.

The pair of sub speed change operation cams are the low speed tension rollers.
As shown in FIGS. 6A and 6B, the low-speed operation cam 131a for driving the 39a and the high-speed operation cam 131b for driving the high-speed tension roller 39b correspond to the operation position of the work lever, as shown in FIGS. Roller engaging recesses I to V 'are formed on the outer peripheral surface. The low-speed operation cam 131a has concave portions II to V provided in a small diameter portion and concave portions I and V 'provided in a large diameter portion.
Conversely, the concave portions II to V are provided in the large diameter portion, and the concave portions I and V 'are provided in the small diameter portion. The rollers 137a and 137 which engage with the roller engagement recesses are opposed to the operation cams 131a and 131b.
Operation arms 138a and 138b that support b at one end are rotatably provided on the operation arm shaft 139. Tension roller 3
9a, 39b are cylindrical shafts 141a, 141b rotatably fitted to the fixed shaft 140.
Are attached to the tension arms 142a and 142b fixed to the base and the base of the tension arm and the operation arm.
138a, 138b and the end opposite to the roller are connected rods 143a,
143b. Tension arms 142a, 142b
Is tension roller 39 by springs 144a and 144b.
a, 39b are urged toward the side pressing the belts 38a, 38b.

Further, clutch disengagement arms 147a, 147b having engagement pins 146a, 146b protruding are fixed to the cylinder shafts 141a, 141b. A base of a clutch pedal rod 148 is rotatably supported by a pedal support shaft 149 provided behind the fixed shaft 140, and a clutch release lever 150 is integrally provided at the base of the clutch pedal rod. The clutch disengaging lever 150 is engaged with a rear end of a clutch disengaging rod 152 having a front end to which a hook 151 for engaging with both of the engagement pins 146a and 146b is fixed.

As shown in FIG. 7, the planting operation cam 133 has operation positions I and II at the large diameter portion and operation positions III to V 'at the small diameter portion. Further, a roller 157 which is in contact with an outer peripheral surface of the planting operation cam 133 is supported by an operation arm 156 which is swingably provided on the operation arm shaft 155. The operation arm 156 is urged by a spring 158 to the side that presses the roller 157 against the cam 133. An end of the shaft 155 opposite to the roller 157 is connected to the planting clutch pin 90.

The hydraulic operation cam 134 is moved to the operation position I as shown in FIG.
V is the smallest diameter, and the operation positions I, II, and III conform to this, and the operation position V is the larger diameter. Then, the operation arm shaft 155
The hydraulic operating cam 1
A roller 163 that contacts the outer peripheral surface of the roller 34 is supported. The operation arm 162 cams the roller 163 by a spring 164.
It is biased to the side that presses on 34. Hydraulic operation cam 134
, An operation wire 165 for operating the hydraulic valve 107 is connected thereto.

Thus, the switching mechanism of the auxiliary transmission 35 and the planting clutch
Since the switching mechanism of 81 and the hydraulic valve 107 are provided separately on the left and right across the steering post 114,
The configuration is simplified, and assembling and maintenance are easy.

Hereinafter, the operation position of the work lever 121 and the auxiliary transmission 35,
The relationship between the planting clutch 81 and the hydraulic valve 107 will be described.

Regarding the auxiliary transmission 35, the work lever 121 is moved to the operating position I.
The tension is applied to the low-speed side belt 38a when it is at I to V, and the tension is applied to the high-speed side belt 38b when the work lever 121 is at the operation position I, V '. Therefore,
The operation position I is "high speed", the operation position II to V is "low speed", and the operation position V 'is "high speed". Further, when the clutch pedal 122 is depressed, the sub-transmission 35 is disengaged regardless of the position of the work lever 121.

With regard to the planting clutch 81, when the working lever 121 is at the operating position I or II, the roller 157 is engaged with the large-diameter portion of the planting operation cam 133, so that the planting clutch pin 90 is pulled up and planted. The clutch 81 is turned on and the work lever 121
Are in the operating positions III, IV, and V, the roller 157 engages with the small diameter portion of the planting operation cam 133, so that the planting clutch pin 9
0 is pushed in and the planting clutch 81 is turned off.

With respect to the hydraulic valve 107, the working lever 121 is in the operating position.
When it is at I or II, it is in the state of planting, when it is at the operating position III, it is the working machine part lowering, when it is at the operating position IV, it is fixed, and when it is at the operating position V, it is the working machine part ascent.

This is summarized in Table 1. in this way,
This is convenient because the operation output can be turned on / off, the working machine portion can be raised / lowered, and the traveling speed can be switched with one lever operation. In addition, since high-speed traveling can be performed with the work machine part raised, for example, when traveling in a field, this can be quickly performed.

[Effects of the Invention] As described above, the agricultural traveling vehicle body according to the present invention is provided with the belt-type transmission so that the belt faces forward and backward on the side of the transmission case. Space for providing a continuously variable transmission in the front-rear direction arranged with the engine is not required, so that the overall length of the vehicle body can be shortened and the weight balance of the entire vehicle body can be improved.

Further, in this kind of agricultural traveling vehicle body, the turning angle of the front wheels that are inside when turning is set to be larger than the turning angle of the front wheels that are outside the turn, but the first power transmission belt is driven by the second power transmission belt. Since the second power transmission belt is provided on the left and right inner sides of the vehicle body with respect to the steering rotation center of the front wheels, and the second transmission belt is provided forward of the steering rotation center of the front wheels. When the front wheel on which the power transmission belt is provided is turned while turning outward, the front wheel can be turned sufficiently large, and a small turn can be made satisfactorily.

[Brief description of the drawings]

1 is a left side view showing a use state of an embodiment of a traveling vehicle body according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a transmission system diagram, FIG. 4 is a sectional view of a transmission case, and FIG. FIG. 5 is a front view of the drive mechanism of the working lever, FIGS. 6 (a) and 6 (b) are left side views showing different states thereof, FIG. 7 is a right side view thereof, and FIGS. It is explanatory drawing of the operation position of a working lever. 1 ... agricultural work machine, 2 ... traveling body, 3 ... link device,
4 Rice transplanter, 10 Mission case, 14 Engine, 22 Front wheel, 22a Front wheel axle, 27 Rear wheel, 27a
… Rear wheel axle, 30 …… engine output shaft, 31 …… counter axle,
32: Mission input shaft, 34: First belt, 35 ...
Sub-transmissions, 38a, 38b ... second belt, 121 ... work lever.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Rihiki Seike 1-Yakura Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. (56) References JP-A-54-84166 (JP, A) JP-A-61-111617 (JP, A) JP-A-54-15936 (JP, U) JP-A-59-196321 (JP, A) , U) Fully open sho 56-84153 (JP, U) Real open sho 56-114933 (JP, U) Real open sho 52-107233 (JP, U)

Claims (1)

(57) [Claims] An agricultural traveling vehicle in which a front wheel is located laterally of a transmission case and a rear wheel is located behind the transmission case, and an engine is provided at an intermediate portion between a front wheel axle supporting the front wheel and a rear wheel axle supporting the rear wheel. , A counter shaft parallel to the engine output shaft protruding from the engine side and the transmission input shaft protruding from the side of the transmission case is provided between the engine output shaft and the counter shaft. And a second transmission belt of a plurality of belts having different transmission speed ratios stretched from the counter shaft to the transmission input shaft between the two shafts. The first power transmission belt is positioned closer to the left and right center of the vehicle than the second power transmission belt and closer to the rear than the steering rotation center of the front wheels, and the second power transmission belt is connected to the steering rotation center of the front wheels. Than Agricultural vehicle body, characterized in that provided respectively on the front side closer.