JP2003094978A - Mounting structure for hydraulic pump in farm working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify mounting of a hydraulic pump 104 in a farm working machine and to reduce parts for power transmission. SOLUTION: The outer peripheral front side of a driving side pulley 21 is covered with a cover part 29b of a support body 29 used as a cover, with a base part 29a fastened to the side face of an engine 5 by a bolt 110, and a fixed sheave 25 is fixed to the inner surface of a tip support part 29c extending backward from the cover part 29b, while the hydraulic pump 104 is fixed to the outer surface. The tip of a boss part 25a of the fixed sheave 25 and an input shaft of the hydraulic pump 104 are detachably connected in series through a universal coupling means 105.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a hydraulic pump in an agricultural machine equipped with a belt pulley type continuously variable transmission for continuously changing the output from an engine.

[0002]

2. Description of the Related Art Conventionally, a belt-pulley type continuously variable transmission for shifting the power of an engine (motor) to a drive wheel or various working parts (PTO shaft) of an agricultural work machine such as a rice transplanter. Those equipped with a device are known.

In addition, in this type of agricultural working machine, a hydraulic pump is provided for supplying pressure oil to a hydraulic cylinder used for raising and lowering a working portion such as a seedling planting device, and is provided from a drive shaft of an engine or a transmission. The hydraulic pump is driven by the rotational force of.

As an example, for example, Japanese Patent Laid-Open No. 10-2
In Japanese Patent No. 88150, a hydraulic pump is arranged outside a flywheel mounted on the end of the output shaft of the engine opposite to the transmission side and supported by the engine, and the drive shaft of the hydraulic pump is connected to the output shaft. A hydraulic pump is mounted on one side of the transmission case with the configuration and the engine mounted on the upper part, and the middle part of the pump drive shaft with one end connected to the hydraulic pump has a bearing etc. on the mounting part on the outer surface of the transmission case. The pump drive shaft is rotatably mounted via a pulley, and a pulley is fixed to the other end of the pump drive shaft. A belt is looped between the pulley fixed to the output shaft protruding from the side of the engine and the drive force is transmitted to the hydraulic pump. A configuration is disclosed.

[0005]

According to the former configuration of the prior arts described above, the output shaft of the engine is arranged outside the flywheel on the opposite side of the projecting side, so that the drive of the hydraulic pump from the output shaft is performed. The interlocking part up to the axis is placed around the outside of the engine, increasing the number of parts and making it bulky. Even in the latter configuration, the output shaft of the engine and the pump drive shaft must be transmitted by a pulley and a belt, and further, a configuration for rotatably supporting the pump drive shaft itself is required. Also in this case, the number of parts increases, the weight also increases, the manufacturing cost increases, and the problem of bulkiness cannot be solved.

The present invention has been made to solve these conventional problems, and it is an object of the present invention to simplify the mounting structure of a hydraulic pump in an agricultural work machine equipped with a continuously variable transmission, and to reduce the weight and size. It is what

[0007]

In order to solve this technical problem, the mounting structure of the hydraulic pump in the agricultural working machine according to the invention of claim 1 is an engine mounted on a vehicle body frame,
An agricultural work machine equipped with a mission case and a belt pulley type continuously variable transmission for transmitting the output from the engine to the mission case, characterized in that an input shaft of a hydraulic pump is connected to an output shaft of the engine. Is.

According to a second aspect of the present invention, in the hydraulic pump mounting structure for the agricultural work machine according to the first aspect, the output shaft of the engine is fitted with the drive side pulley of the continuously variable transmission, and the drive side pulley is fitted. An input shaft of the hydraulic pump is detachably connected to a boss portion of a fixed sheave of the pulley.

The invention described in claim 3 is the same as that of claim 2
In the mounting structure of the hydraulic pump in the agricultural working machine described in (3), a universal joint means is inserted between the boss portion of the fixed sheave and the input shaft of the hydraulic pump so as to be detachably connected.

According to a fourth aspect of the present invention, in the hydraulic pump mounting structure for the agricultural work machine according to the second or third aspect, the boss of the fixed sheave is attached to the output shaft protruding from the side surface of the engine. Part is fitted and fixed, and the movable sheave is slidably attached to the boss part in the axial direction, while the support member fixed to the engine case is sandwiched between the fixed sheave and the movable sheave to the outside. A hydraulic pump is fixed, and the hydraulic pump is connected in series to the boss via universal joint means.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view of a rice transplanter as an agricultural working machine to which the present invention is applied, FIG. 2 is a plan view, and FIG.
Is a perspective view of an engine, a transmission case and a belt pulley type continuously variable transmission according to the present invention, FIG. 4 is a perspective view of a vehicle body frame, FIG. 5 is a plan view showing the continuously variable transmission and its operating portion, and FIG. 7 is a sectional view, FIG. 8 is a plan view of a driving pulley, FIG. 9 is a plan view of a driven pulley, and FIG. 10 is a side view for explaining a gear shifting operation.
Is a side view of the operating portion, FIG. 12 is a perspective view of the operating portion, and FIG.
FIG. 13A is a perspective view of a joint means for transmitting power to a hydraulic pump, and FIG. 13B is an enlarged cross-sectional view of a main part in a connected state.

The rice transplanter according to the present invention is a four-row planting type rice transplanter (see FIG. 2). The rice transplanter is composed of a traveling machine body 1 and a seedling planting device 9 connected to the rear part thereof. There is. A pair of left and right front wheels 3, 3 and rear wheels 4, 4 are suspended at the front and rear of the vehicle body frame 2 of the traveling vehicle body 1, respectively. As shown in FIGS. 3 to 5, the vehicle body frame 2 includes a pair of left and right main frames 80 and 81 that are long in the front-rear direction along the traveling direction of the traveling machine body 1 and a front frame that is substantially U-shaped in plan view and connects the front ends of the main frames 80 and 81. 82, an engine base 84 whose front end is connected to the left-right center of the front frame 82, and whose rear side parts are connected to a front connecting frame 83 extending laterally from the pair of left and right main frames 80, 81;
It is composed of a downward U-shaped rear frame 85 connected between the rear ends of the pair of left and right main frames 80 and 81. The front and rear midway portions of the main frames 80 and 81 are connected by a center connecting frame 86, and the front Both outer ends of the connecting frame 83 and the left and right rear ends of the front frame 82 are connected to form a strong frame body.

An engine 5 as a prime mover is mounted on an engine base 84 at the front of the body frame 2.
A mission case 6 which is long in the front-rear direction (a direction along the traveling direction of the traveling machine body 1) is arranged in series with the engine 5 in a substantially left-right central portion of the vehicle body frame 2 behind the engine 5. The front end of the mission case 6 has an engine base 8
4 is attached to the attachment member 87 at the rear end of the transmission case 6, and the front and rear midway portions of the mission case 6 are connected to the lower portion of the attachment member 88 fixed to the left and right central portions of the center connection frame 86. Mounting plate 89 via rear axle case 6a provided integrally
Is connected to the lower end of the rear frame 85 by.

The power of the engine 5 is transmitted to the mission case 6 via a belt pulley type continuously variable transmission 10, which will be described in detail later, and then via a front axle case 6b provided in the front portion of the mission case 6. Left and right front wheels 3,
3 and the rear left and right wheels 4, 4 via the rear axle case 6a provided at the rear of the mission case 6.
4 is also transmitted.

Body cover 1 for covering the mission case 6 and the like
A driver's seat 7 is provided on an upper portion of the vehicle 1, and an operator sitting on the driver's seat 7 operates a steering wheel 8 which is erected at a rear end of a bonnet cover 12 that covers the engine 5 so that the front wheels 3, 3.
Steer 3 In addition, on the outside of the side deck panels 13, 13 arranged on the left and right sides of the lower portion of the bonnet cover 12, and on the square pipe-shaped mounting members 14, 14 provided at both outer ends of the front connecting frame 83,
A column-shaped support portion 16 (only one of which is shown in FIG. 1) for the preliminary seedling stand 15 is provided upright.

A seedling planting device 9 is vertically movably connected via a parallel link mechanism 17 arranged at the rear end of the traveling machine body 1. The seedling planting device 9 includes a lifting hydraulic cylinder 18
It is configured to be adjustable up and down with the mission case 6
Power transmission cases 50, 50 (two in the embodiment) in which power is transmitted from a planted PTO shaft (not shown) projecting rearward to the rear side via a universal joint transmission shaft (not shown) and the like. The upper end of the seedling mounting table 51, which is slidably mounted on the upper rail and the lower rail mounted between the upper surfaces of the left and right transmission cases 50, 50 on the pillar 52 standing upright from the 50, 50, has its upper end. It is arranged in a forward tilted shape so as to approach the rear part of the traveling body 1,
It is configured to reciprocate left and right.

A rotary type seedling planting mechanism 53 that rotates up and down is provided on both left and right side surfaces of each transmission case 50. The planting rod 54 of each of these seedling planting mechanisms 53 moves up and down between the lower end of the seedling platform 51 and the field scene, while using the planting claws at the tip of each planting rod 22 to plant the seedling platform 51. One seedling of seedlings is taken out from the plant and the seedlings are planted in the field (see FIGS. 1 and 2).

Further, under the seedling planting device 9, floats 55 (three in the embodiment) that slide on the mud surface of the field are arranged to keep the right and left balance of the seedling planting device 9,
It is designed to stabilize the posture of planting seedlings.

As shown in FIGS. 1 and 2, the fertilizer application device 60 includes a plurality of (four in the embodiment) fertilizer storages arranged side by side behind the driver's seat 7 (in the lateral width direction of the traveling machine body 1). A hopper 61 for feeding, a feeding mechanism 62 provided at a lower portion of each hopper 61, a feeding pipe 64 that connects the feeding mechanism 62, and a grooving device 63 arranged on the side of the float 55. Compressed air (air) from the blower 65
Is blown toward the hose joint (not shown) at the bottom of each feeding mechanism 62 via the horizontally long air tank 66. As a result, the fertilizer released into each hose joint is released from the corresponding grooving device 63 to the side part of the planting strip in the field along with the above-mentioned compressed air through each transfer pipe 64.

A planting lift lever 66 also serving as an auxiliary gear shift is arranged on the side of the driver's seat 7 of the body cover 11 (on the right side in the embodiment), and a main gear shift lever 67 is provided in the driving section.
Further, a seedling joint lever 68 is provided, and the main deck petals 69, the brake petals 70, etc. are arranged on the side deck panels 13, 13.

Next, the arrangement and configuration of the belt pulley type continuously variable transmission 10 will be described with reference to FIGS. The continuously variable transmission 10 is arranged between the engine 5 and the transmission case 6 on one side (left side surface in the embodiment) and one (left side) main frame 80.
A drive side pulley 21 provided on a drive shaft 20 protruding from a side surface of the engine 5 and a driven side pulley 2 provided on a driven shaft (input shaft) 22 protruding from a side surface of the transmission case 6.
3 and a belt 24 wound around both pulleys 21 and 23.

Fixed sheave 25 in the driving pulley 21
The movable sheave 26, the fixed sheave 39 and the movable sheave 41 of the driven pulley 23 are arranged with their conical surfaces facing each other.

Fixed sheave 25 in the driving pulley 21
Shall be arranged on the side close to the side surface of the engine 5,
The boss portion 25a is fitted onto the drive shaft 20, and is fixed so as to be immovable in the axial direction by a key or the like so as to rotate integrally. A sliding key 2 in which a key groove formed on the inner diameter of the boss portion of the movable sheave 26 is fixed to the outer periphery of the boss portion 25a.
7, the movable sheave 26 is fixed by, for example, slidably fitting it on the movable sheave 7, or as another embodiment, forming a spline groove and a spline shaft in the boss portion 25a of the fixed sheave 25 and the boss portion of the movable sheave 26. The sheave 25 is configured to be able to approach and separate (contact and separate). The movable sheave 26 is arranged closer to the inner surface side of the one main frame 80 than the fixed sheave 25.

The support 29, which also serves as a cover and has its base end fixed to the side surface of the engine 5 as the machine-side case by bolts 110, etc., is the one main frame 80 in plan view.
Is arranged between the inner surface side of the engine and the side surface of the engine 5 (machine body side case) (see FIGS. 3, 5 and 7). On the support 29, a fixed cam 31 as one element (fixing member) of the cam means 30 in the actuating mechanism for moving the movable sheave 26 toward and away from the fixed sheave 25 is fixed.
It is fixed at 8. A boss portion 25a of the fixed sheave 25 is rotatably supported relative to an inner diameter portion of the fixed cam 31 via a bearing bearing 32. On the other hand, a movable cam 34 as the other element (adjustment member) of the cam means 30 is rotatably mounted on the back side of the movable sheave 26 via a bearing bearing 33. In the embodiment, the cam means 30 includes an inclined cam surface 34 a formed on the back surface of the movable cam 34 and an inclined cam surface 34 a.
The support base 36 is attached to the disk surface of the fixed cam 31 so as to abut the a.
Rolling element 3 such as a bearing rotatably provided via
It consists of 5. In the embodiment, the three inclined cam surfaces 34a, which are divided into three equal parts in the circumferential direction, are set at a predetermined inclination angle θ1 with respect to the plane orthogonal to the central axis of the drive shaft 20 (see FIG. 8). As shown in FIG. 10, the drive shaft 20
Of the arm 34 at a location separated by a radius r1 from the central axis of the
The distal end of the drive side operating rod 37 is rotatably attached to b. The drive-side operation rod 37 operates to move the movable sheave 26 toward and away from the fixed sheave 25.

The bolt 3 screwed to the drive shaft 20.
8a and a retaining ring 38b are arranged inside the boss portion 25a of the fixed sheave 25, and the retaining ring 3 is attached to the head of the bolt 38a.
8b is pressed against the boss portion 25a to be fixed in position, and the fixed sheave 25 can be attached and detached in the axial direction of the drive shaft 20 by removing the bolt 38a and the retaining ring 38b (see FIG. 7).

Further, as shown in FIGS. 3, 5, 6, 7, and 8, the support body 29 having a cover function for covering the front and side surfaces of the drive side pulley 21 is the engine side case 5 29a for fixing the bolt 110 to the side surface of the
A cover portion 29b that covers a range of about a quarter arc on the outer peripheral side of the drive pulley 21 on the front side of the vehicle body frame 2 and the rear portion of the vehicle body frame 2 from the cover portion 29b (engine 5
Plate-like tip support portion 29c extending substantially parallel to the side surface of the
Consists of. The fixed cam 3 with the tip support portion 29c interposed therebetween.
1 and the hydraulic pump 104 are fixed with bolts.

Tip support portion 29c of the support body 29
Shaft 104a of the hydraulic pump 104 fixed to the outer surface of the
Faces the internal affairs portion of the boss portion 25a of the fixed sheave 25 so as to face the tip end side of the drive shaft 20 which is the output shaft of the engine 5 through the through hole on the inner diameter side of the fixed cam 31 (see FIG. 7). ). The boss portion 25a of the fixed sheave 25 that rotates integrally with the drive shaft 20 and the input shaft 104a of the hydraulic pump 104 are detachable and serially connected via a universal joint means 105 such as an Oldham universal joint. To do. A concrete example of the Oldham universal joint which is the universal joint means 105 in the present embodiment is, as shown in FIGS. 13A and 13B, a pair of width dimensions h1 at the tip of the boss portion 25a with the rotation center line therebetween. While forming the notch engaging grooves 107, 107 of the joint body 108 having a width dimension h1 and a length dimension d2 which is longer than the diameter dimension d1 of the boss portion 25a,
The length (h3) of the joint body 108 is long in the width direction, and the joint body 1
The rectangular fitting hole 1 having a short width dimension d3 in the length direction 08
08a is drilled. A pair of sliding pieces 109a, 109a, which are flush with the longitudinal both side surfaces of the fitting hole 108a, are fixed to the inner side of the fitting hole 108a by welding or the like, and both ends are connected by a reinforcing piece 109b. To do. The input shaft 104a of the hydraulic pump 104 has a length dimension (h2 <h3) and a width dimension d4.
It is formed to have a rectangular cross section (almost the same as the d3 and slidable).

The joint body 108 is fitted into the notch engaging grooves 107, 107 of the boss portion 25a, while the joint body 1 is inserted.
When the input shaft 104a is inserted into the fitting hole 108a of No. 08, the joint body 108 is slidably fitted only in the X direction with respect to the boss portion 25a, and the joint body 108 has a longitudinal dimension h3. Since it is larger than the longitudinal dimension h2 of the input shaft 104a, it can slide only in the Y direction with respect to the input shaft 104a. Therefore, the boss portion 2 of the fixed sheave 25
Even if the rotation center axis of 5a and the rotation center axis of the input shaft 104a of the hydraulic pump 104 are deviated in parallel,
Further, even if the mounting is such that an angle of deviation is generated between the two rotation center axes, the rotational force can be smoothly transmitted without being twisted. There are various possible embodiments of the Oldham joint, but if the Oldham universal joint of the embodiment is adopted, the joint body 108 can be used for any shaft 104a or boss portion 2.
There is no need to fix it to 5a, it can be made extremely compact, and by simply removing the hydraulic pump 104 from the support body 29, it can be detached from the joint body 108, so that the attachment and detachment work can be done easily. The power transmission means can be made compact. A connecting bracket 1 is bolted to the rear end of the support body 29 (the rear end of the front end support portion 29c).
By fixing it to the one main frame 80 via 06 (see FIGS. 6 and 7), the supporting state of the drive pulley 21 and the hydraulic pump 104 can be strengthened. In that case, a vibration damping member is interposed between the base portion 29a of the support body 29 and the side surface of the engine 5, between the connection bracket 106 and the main frame 80, and / or between the support body 29 and the connection bracket 106. By doing so, it is possible to effectively prevent the vibration of the engine 5 from being transmitted to other members.

On the other hand, the fixed sheave 39 of the driven pulley 23 is located away from the side surface of the mission case 6 (in other words, the side closer to the inner surface of the one main frame 80).
The boss portion 39a is fitted on the driven shaft 22, is fixed immovably in the axial direction by a key or the like, and is integrally rotated. This driven shaft 22
The bolt 40a and the retaining ring 40b screwed onto the fixed sheave 3
It is arranged on the inner diameter portion of the boss portion 39a of 9 (see FIG. 7). The retaining ring 40b is pressed against the boss 39a by the head of the bolt 40a and fixed in position, and the fixed sheave 39 can be detached in the axial direction of the driven shaft 22 by removing the bolt 40a and the retaining ring 40b. Driven pulley 2
The movable sheave 41 in No. 3 is arranged on the side close to the side surface of the mission case 6, and the key groove formed in the inner diameter of the boss portion of the movable sheave 41 slides on the sliding key 42 fixed to the outer periphery of the boss portion 39a of the fixed sheave 39. You can freely fit it,
As another embodiment, the movable sheave 41 is fixed to the fixed sheave 39 by forming a spline groove and a spline shaft in the boss portion 39a of the fixed sheave 39 and the boss portion of the movable sheave 41.
It is configured to be able to approach and separate from.

As shown in FIG. 6, when viewed from the side, the entire drive-side pulley 21 is a support 29 that also serves as a cover.
In addition, since the driven pulley 23 is arranged above the upper surface of the one main frame 80, and only the portion below the driven shaft 22 of the driven pulley 23 overlaps with the main frame 80 in a side view. , A mounting portion of the drive side pulley 21 to the side surface of the engine 5 (drive shaft 2
0) and the attachment portion (driven shaft 23) of the driven pulley 23 to the side surface of the transmission case 6, the main frame 8
Since it is above the upper surface of 0, the work of attaching and detaching the drive side pulley 21 and the driven side pulley 23 can be performed in the upper direction of the main frame 80 during maintenance, and the maintainability is good.

As shown in FIGS. 5 and 7, the driven pulley 23 has a space 112 of dimension L1 formed between the inner surface of one main frame 80 and the driven pulley 23 in plan view. The pulley 23 can be used as a space for attaching / detaching components when the pulley 23 is pulled out laterally from the driven shaft 22.

The cam means 43 of the operating mechanism is provided between the back surface of the movable sheave 41 and the side surface of the mission case 6.
To place. In the embodiment, the fixed cam 44 as one element of the cam means 43 is fixed to the side surface of the mission case 6 with the bolts 111 and the like (see FIGS. 7 and 9), while the fixed cam 44 serves as the other element of the cam means 43. Movable cam 45
Is rotatably attached to the back side of the movable sheave 41 via a bearing bearing 46. In the embodiment, as shown in FIG. 9, the cam means 43 is
An inclined cam surface 45a formed on the back surface of the movable cam 45,
It comprises a rolling element 47 such as a bearing rotatably provided on the disk surface of the fixed cam 44 via the support base 36 so as to come into contact with the inclined cam surface 45a. In the embodiment, the cam means 30 and 43 arranged on the drive side pulley 21 and the driven side pulley 23 share the same size and shape. Therefore,
The inclination angle θ2 of the inclined cam surface 45a is designed to be equal to θ1. However, as shown in FIG. 10, the distal end portion of the driven side actuating rod 48 is rotatably attached to the arm portion 45b at a location separated by a radius r2 (<r1) from the central axis of the driven shaft 22. This driven rod 4
8, the movable sheave 41 is operated so as to move toward and away from the fixed sheave 39. Therefore, the moving direction of the movable sheave 26 in the drive side pulley 21 and the moving direction of the movable sheave 41 in the driven side pulley 23 have an arrangement relationship in which they are inversely operated.

The base end shaft 72 of the arm 71 that rotatably supports the tension roller 49 for keeping the tension of the belt 24 wound around the driving pulley 21 and the driven pulley 23 substantially constant is the engine. The tension roller 4 is fixed to the side surface of the base 84 and is attached to the outer circumference of the belt 24 on the loose side.
9 is pressed by a spring 73 (FIG. 6).
And FIG. 7).

Then, as shown in FIGS. 5, 7 and 10, an arm portion 34b as an operating mechanism for operating the movable sheave 26 of the driving pulley 21 and the movable sheave 41 of the driven pulley 23. The drive-side actuating rod 37 whose tip is connected to it, and the arm 45b and the driven-side actuating rod 48 whose tip is connected to each other, have one main frame 80 in plan view (see FIG. 5).
It is arranged in the space between the engine 5 and the side surface of the mission case 6. In addition, the drive side operating rod 37
The driven rod 48 and the driven rod 48 extend substantially linearly in a rearward direction substantially parallel to the main frame 80, and in a side view (see FIG. 10), the main frame 8 is provided.
It is arranged so as to substantially overlap with 0. Therefore, the driving side operating rod 37 and the driven side operating rod 48 as the operating mechanism in both the pulleys 21 and 23 have high rigidity for the engine 5, the transmission case 6 and the main frame 80.
Since it is surrounded and protected by a plan view and a side view, there is less risk that the actuation mechanism will be damaged or bent due to collision of foreign matter from the outside. Further, the arm portion 34b and the driving side actuating rod 37 as the both actuating mechanisms, and the arm portion 45b and the driven side actuating rod 48 are located closer to each other than the pulley center shafts (the drive shaft 20 and the driven shaft 22) of the pulleys 21 and 23. Since it is arranged below (see FIG. 10), even if most of the parts of the pulleys 21 and 23 are arranged at a position higher than the main frame 80, the rotating or moving part thereof is referred to as the main frame 80. Can be placed at the same height and does not get bulky.

Further, as shown in FIG. 6, the drive side pulley 21, the driven side pulley 23, and the upper side of the belt 24 are covered and protected from above by a removable body deck cover such as a side deck panel 13. At the time of maintenance, the work can be easily performed by removing the vehicle body cover such as the side deck panel 13.
3 (the arm portion 34b and the driving side operating rod 37, and the arm portion 45b and the driven side operating rod 48)
Are arranged below the pulley center axes of both pulleys 21 and 23, the side deck panel 1
Even if 3 is provided at a low position, it does not interfere with the actuating mechanism, and the side deck panel 13 at the low position has an effect that the operator can easily get on and off.

13A and 13B, the fixed sheave 3 in the driving pulley 21 and the driven pulley 23 is shown.
1 shows the structure of a support base 36 for rotatably supporting the rolling elements 35 and 47 in the reference numeral 39, and a pair of support bases 36 (3
6a, 36b) are erected on the surfaces of the fixed sheaves 31, 39,
A semi-circular concave portion 114 is formed at each tip, and a support shaft 115 is fitted into each concave portion 114.
At a (the side receiving a large amount of load from the inclined cam surface, usually outside the radii of the fixed sheaves 31, 39), the tip of a pin 116 penetrating the support shaft 115 in the diameter direction is fitted and fixed. Each support shaft 115 has a rolling element 35 (4
7) is rotatably mounted. As a result, the height of the support base 36 (36a, 36b) can be reduced, and the support shaft 115 can be easily attached and detached during maintenance such as replacement work of the rolling elements 35 (47). In addition,
A wall surface for preventing the spindle 115 from moving in the axial direction is provided on the outer surfaces of the pair of support bases 36a and 36b, and the spindle is supported by a pin penetrating the wall and driven in parallel with the axial direction of the spindle 115. It may be configured to prevent the falling of 115.

The operating portion 90 of the continuously variable transmission is
As shown in FIG. 5, FIG. 10, FIG. 11 and FIG. 12, it is carried out by the sub-transmission / plantation lifting lever 66. That is, each of the drive-side actuating rod 37 and the driven-side actuating rod 48 is attached to the pipe-shaped common operating shaft 92 that is rotatably fitted to the round shaft 91 that is provided between the left and right main frames 80 and 81. Output bracket 9 to which the base ends are connected
3a and 93b are fixed in phase (see FIGS. 5 and 1).
0). Further, an input bracket 94 is fixed to the common operation shaft 92 at a portion close to the right main frame 81 in the traveling direction, and the input bracket 94 and the operation link 96 are connected via a rod 95. Working link 96
Is a lifting lever 6 with a sub-gear and a plant around the support shaft 97.
6 is rotatable around the support shaft 99 on the outer peripheral side of the dedent body 98 that rotates integrally with the roller 6, and the roller 101 provided in the middle portion of the operation link 96 is always in contact with the outer peripheral edge of the dedent body 98. Thus, it is biased by the spring 100 (see FIG. 11). The base end of the pressing link 102 has the support shaft 99 so that the roller 103 at the tip of the pressing link 102 is always in contact with the dedent portion 98a at the outer peripheral edge of the dedent body 98.
Is rotatable around and is biased by a torsion spring (not shown).

Note that, in FIG. 11, when the raising / lowering lever 66 for sub-transmission and also with planting is at the rightmost position UP (corresponding to a position opposite to the traveling direction of the traveling body 1 in FIG. 2), the seedling planting device 9 is set in the field. It will be a seedling planting position to raise it further,
At the N position to the left of the left side, the neutral position). At the DW position to the left of the left side, the float 55 of the seedling planting device 9 is in the seedling lowering position in contact with the field scene. Then, when the sub-transmission / plantation up / down lever 66 is tilted forward to the left LO position, the planting clutch (not shown) is turned on, and in FIG.
Rotate the dedent body 98 clockwise so that the dedent body 98
Is in a two-dot chain line state, the roller 101 comes into contact with a portion of the dedent body 98 having a small radius. The upper end of the operation link 96 is directed downward via the roller 101, and the rod 9
The input bracket 94 is rotated clockwise through 5.
As a result, as shown in FIG. 10, the output bracket 93a (93b) is rotated clockwise through the common operation shaft 92 to be in the solid line state, so that the drive side operating rod 37 and the driven side operating rod 48 are not shown. When pushed to the left of 10, the continuously variable transmission 10 enters a low speed state (LO). That is, when the drive side operating rod 37 is moved to the left (arrow A) in FIG. 10, the movable cam 34 rotates clockwise, and
The movable sheave 2 is moved by the movable cam 34 at the position indicated by the solid line.
6 separates from the fixed sheave 25, and the effective winding diameter of the belt 24 around the drive pulley 21 becomes smaller. On the other hand, when the driven side actuating rod 48 is moved to the left (arrow A ') in FIG. 10, the movable cam 45 also rotates clockwise, and the movable cam 45 in the position shown by the solid line in FIG.
The movable sheave 41 approaches the fixed sheave 39, and the effective winding radius of the belt 24 with respect to the driven pulley 23 increases, whereby the driven shaft 22 rotates at a lower speed than the drive shaft 20.

FIG. 11 shows the raising / lowering lever 66 with a sub-transmission and a plant.
When it is tilted forward to the HI position, the dedent body 98 rotates counterclockwise to the solid line state in FIG. 11, and the roller 101 comes into contact with the portion of the tent body 98 having a large radius, and the operating link Since the tip (upper end) of 96 is pulled up,
By pulling the rod 95 upward, as shown in FIG. 10, the output bracket 93a is connected via the common operation shaft 92.
Since (93b) rotates counterclockwise to be in a two-dot chain line state, the driving side operating rod 37 and the driven side operating rod 48 are provided.
10 to the right in FIG. 10, the continuously variable transmission 10 enters the high speed state (HI).

That is, when shifting from the low speed state to the high speed state, if the drive side operating rod 37 is moved to the right (arrow B) in FIG. 10, it is rotated counterclockwise as in the two-dot chain line state in FIG. By the movable cam 34, the movable sheave 26 approaches the fixed sheave 25, and the effective winding radius of the belt 24 becomes large, while the driven side operating rod 48 moves in the right direction (arrow B ') in FIG. Then, the movable cam 45 also rotates in the counterclockwise direction, as shown in FIG.
By the movable cam 45 in the position of the two-dot chain line state, the movable sheave 41 is separated from the fixed sheave 39, the effective radius of the belt 24 becomes small, and the driven shaft 22 rotates at high speed.

In the present invention, both the fixed cam and the movable cam may be in contact with each other by the inclined cam surfaces, but the contact between the inclined cam surface and the rolling element causes the fixed cam to have a contact resistance force with the movable cam. This has the effect of reducing the amount and reducing the force required for gear shifting. Further, in the above embodiment, the inclined cam surfaces 34a and 45a are formed on the movable cams 34 and 45,
The fixed cams 31 and 44 were provided with the rolling elements 35 and 47, but conversely, the fixed cams 31 and 44 were formed with inclined cam surfaces,
The rolling elements 35 and 47 may be provided on the movable cams 34 and 45.

In the above embodiment, the driving pulley 2
The support member 29 is provided for the driven pulley 23
The support member 29 may be provided in the above case, and in this case, the direction of the support member 29 is reversed in FIG. It goes without saying that the present invention can be applied to agricultural working machines such as a tiller and a management machine other than the rice transplanter. In that case, the operating lever is the common operating shaft 9
Anything that rotates 2 may be used.

In the above embodiment, the output shaft 2 of the engine 5
The boss portion 25a of the fixed sheave 25 and the input shaft 104a of the hydraulic pump 104 which rotate integrally with the joint output 105.
However, in another embodiment, the output shaft 20 and the input shaft 104a may be connected via another joint means. Also, the support of the hydraulic pump 104 is
Instead of using the side surface of the engine 5, a support bracket or the like provided on the main frame 80 or the like may be used.

[0044]

As described in detail above, the mounting structure for the hydraulic pump in the agricultural working machine according to the first aspect of the invention is the engine mounted on the vehicle body frame, the mission case, and the output from the engine is transmitted to the mission case. In the agricultural work machine equipped with the belt pulley type continuously variable transmission, the input shaft of the hydraulic pump is connected to the output shaft of the engine, so that the output shaft is directly connected to the input shaft. Since they can be connected and the number of parts for power transmission can be reduced as much as possible, there is an effect that the manufacturing cost can be reduced and the weight can be reduced.

According to a second aspect of the present invention, in the hydraulic pump mounting structure for the agricultural working machine according to the first aspect, the output shaft of the engine is fitted with the drive side pulley of the continuously variable transmission, and the drive side pulley is fitted. Since the input shaft of the hydraulic pump is detachably connected to the boss portion of the fixed sheave of the pulley, the input shaft of the hydraulic pump can be connected using the fixed sheave of the continuously variable transmission. Also in this case, the number of parts for power transmission can be reduced as much as possible, the manufacturing cost can be reduced, and the weight can be reduced.

Further, the invention according to claim 3 is the same as claim 2
The hydraulic pump mounting structure for an agricultural work machine according to claim 2, wherein a universal joint means is interposed between the boss portion of the fixed sheave and the input shaft of the hydraulic pump so as to be detachably connected. In addition to the effects of the invention described in (1), even if the rotation center axis of the boss portion of the fixed sheave and the rotation center axis of the input shaft of the hydraulic pump are deviated in parallel, there is a deviation between both rotation center axes. Even if there are corners, the rotational driving force can be transmitted smoothly. Therefore, there is an effect that it is not necessary to strictly attach the hydraulic pump, and the attaching / detaching work can be easily performed at the time of maintenance.

According to a fourth aspect of the invention, in the hydraulic pump mounting structure of the agricultural working machine according to the second or third aspect, the boss of the fixed sheave is attached to the output shaft protruding from the side surface of the engine. Part is fitted and fixed, and the movable sheave is slidably attached to the boss part in the axial direction, while the support member fixed to the engine case is sandwiched between the fixed sheave and the movable sheave to the outside. A hydraulic pump is fixed, and the hydraulic pump is connected in series to the boss through a joint means.

Therefore, the support member can be used both as a mounting member for the hydraulic pump and as a protecting member for the pulley, and the drive shaft and the input shaft of the hydraulic pump are connected in series via the universal joint means, so that the hydraulic pressure is increased. Power transmission can be smoothed and the number of parts for mounting and driving the hydraulic pump can be significantly reduced, and weight reduction and compactness can be achieved without strict pump mounting accuracy.
It has a remarkable effect that the manufacturing cost can be reduced.

[Brief description of drawings]

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

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

FIG. 3 is a schematic perspective view of a body frame, an engine, a transmission case, and a continuously variable transmission.

FIG. 4 is a perspective view of a body frame.

FIG. 5 is a schematic plan view of a body frame, an engine, a transmission case, and a continuously variable transmission.

FIG. 6 is a side view of a continuously variable transmission.

FIG. 7 is a cross-sectional view of a continuously variable transmission.

FIG. 8 is an enlarged plan view of a drive pulley portion.

FIG. 9 is an enlarged plan view of a driven pulley portion.

FIG. 10 is an operation explanatory view.

FIG. 11 is a side view of an operating portion of the continuously variable transmission.

FIG. 12 is a perspective view of an operating portion of the continuously variable transmission.

13A is a partially cutaway perspective view showing the structure of an Oldham universal joint, and FIG. 13B is an enlarged cross-sectional view of a main part showing a mounted state.

[Explanation of symbols]

5 engine 6 mission case 10 continuously variable transmission 15 Seedling plant 20 drive shaft 21 Drive side pulley 22 Driven shaft 23 Driven pulley 24 belts 25, 39 fixed sheave 25a Boss 26, 41 movable sheave 29 Support that doubles as a cover 29a base 29b cover part 29c Tip support 30, 43 Cam means 31,44 Fixed cam 34, 45 movable cam 34a, 45a inclined cam surface 35, 47 rolling elements 37 Drive side operating rod 48 Driven rod 66 Lifting lever with sub gear and dual use 80 mainframe 104 hydraulic pump 104a input shaft 105 Universal joint means 106 connecting bracket 107 Notch engagement groove 108 Joint body 108a fitting hole 110 volts

Claims (4)

[Claims] 1. An agricultural work machine equipped with an engine mounted on a body frame, a mission case, and a belt pulley type continuously variable transmission for transmitting the output from the engine to the mission case. A mounting structure for a hydraulic pump in an agricultural work machine, characterized in that an input shaft of the pump is connected. 2. A drive-side pulley of the continuously variable transmission is fitted on an output shaft of the engine, and an input shaft of the hydraulic pump is detachably connected to a boss portion of a fixed sheave of the drive-side pulley. The mounting structure for the hydraulic pump in the agricultural work machine according to claim 1. 3. The hydraulic pump for an agricultural work machine according to claim 2, wherein a universal joint means is interposed between the boss portion of the fixed sheave and the input shaft of the hydraulic pump so as to be detachably connected. Mounting structure. 4. A boss portion of the fixed sheave is fitted and fixed on an output shaft protruding from a side surface of the engine, and a movable sheave is axially slidably mounted on the boss portion, while the engine is provided. A hydraulic pump is fixed to the outer side of the support member fixed to the case by sandwiching the fixed sheave and the movable sheave, and the hydraulic pump is connected in series to the boss via universal joint means. The mounting structure of the hydraulic pump in the agricultural working machine according to claim 2 or 3.