JPH08130908A - Rear partition wall structure of farm tractor - Google Patents

Abstract

PURPOSE: To increase the strength and rigidity of a tractor by rationalizing the support of the front ends of a three-point link mechanism and a lifting mechanism for the connection of a working machine. CONSTITUTION: A rear partition wall W is erected at the rear end of a machine body frame, a hydraulic case and a hydraulic valve are placed inside of the rear partition wall W, the front end parts of a three-point link mechanism 8 and a lifting mechanism for connecting a working machine are supported outside of the rear partition wall W, a traction hitch is placed under the outer side face of the rear partition wall W and various rods for the feedback of the lifting and lowering motion of the working machine to a position valve 65 are passed through the wall.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a rear partition structure for agricultural tractors.

[0002]

2. Description of the Related Art Conventionally, agricultural tractors have been constructed so that a working machine such as a rotary cultivator is connected to perform agricultural work through a three-point link mechanism and an elevating mechanism provided at a rear portion.

[0003]

However, in addition to the traction force, the above-mentioned three-point link mechanism and the lifting mechanism are subjected to complicated weights in various directions such as a reaction force for lifting the working machine and a reaction force for ground work. Regardless, since the front end supporting points of the three-point link mechanism and the elevating mechanism are dispersed in the rear part of the machine body, there is a problem that the structure is complicated because of unreasonable strength.

[0004]

According to the present invention, a rear bulkhead is erected at the rear end of a machine body frame, a hydraulic case and a hydraulic valve are provided inside the rear bulkhead, and a work machine connection is provided outside the rear bulkhead. It supports the front end of the three-point link mechanism and lifting mechanism, and a tow hitch is provided on the lower part of the outer surface of the rear bulkhead, and various rods are used to feed back the lifting operation of the working machine to the position valve. A rear partition structure for an agricultural tractor characterized by being penetrated.

Further, a rear partition wall is erected at the rear end portion of the machine body frame, and a pivotal support portion for supporting the front end portions of the three-point link mechanism for connecting the working machine and the lifting mechanism is projected to the outside of the rear partition wall. Each of them is composed of a pair of vertically long strip-shaped support plates,
Further, the rear wall of the cabin is extended obliquely rearward and upward from the upper edge of the rear bulkhead to separate the operating unit from the working machine, and the rear bulkhead is erected at the rear end of the machine frame, From the inner surface of the rear bulkhead, the hydraulic hose to the lifting mechanism and the inner connector provided in the middle of the external hydraulic outlet hose are passed through and fixed, and the outer connector can be connected to the inner connector from the outer surface of the rear bulkhead. It also has features.

[0006]

Embodiments of the present invention will be described with reference to the drawings.

1 to 3 show an agricultural tractor A according to the present invention. The tractor A has a machine frame 2 mounted on an upper surface of a crawler type traveling device 1 and is mounted on the machine frame 2. The engine part 3 is mounted on the front part of the plane, and the aircraft frame 2
A cabin 7 enclosing a driving section 6 including a steering handle 4 and a seat 5 is mounted on the rear portion of the upper surface of the vehicle body frame 2
A rotary cultivator as a working machine B is movably connected to the rear end portion of the machine through a three-point link mechanism 8 and a lifting mechanism 9.

As shown in FIG. 1, the crawler-type traveling device 1 has a horizontal frame-shaped traveling frame 10 on which left and right drive sprockets 11 are pivotally supported at the left and right front ends thereof. The left and right driven sprockets 12 are rotatably supported at the rear end, the upper roller 13 is rotatably supported on the upper surface of the traveling frame 10, and the two lower rollers 14 are respectively rotatably supported below the traveling frame 10. A pair of equalizers 15 is attached.

The left and right drive sprockets 11, the left and right driven sprockets 12, the left and right upper rolling wheels 13, and the lower rolling wheels 14
Left and right crawlers 16 are respectively wound around the outer periphery of ..., and left and right drive sprockets 11 are linked to left and right hydraulic motors 17 that form part of a hydrostatic transmission described later, and are mounted on the prime mover section 3. The power from the engine 18 is changed by the hydrostatic transmission to be transmitted to the left and right crawlers 16 to drive the tractor A.

In FIG. 3, reference numeral 19 denotes a tow hitch, which is provided so as to protrude from the lower center of the rear surface of a rear partition wall W which will be described later.

In the agricultural tractor A, the working machine B is vertically movable via a three-point link mechanism 8 attached to and an elevating mechanism 9.

In the three-point link mechanism 8, as shown in FIGS. 1 and 4 to 6, a rear partition wall W is erected on the rear portion of the traveling section frame 10, and left and right lower link supports are provided on the left and right rear surfaces of the rear partition wall W. The bodies 23 and 24 are formed, and the front ends of the left and right lower links 25 and 26 of the three-point link mechanism 8 are rotatably pivotally attached to the rear partition wall W.
The front end of the top link 29 is rotatably pivoted to the upper center of the rear surface via a buffer mechanism 28, and the rear ends of the left and right lower links 25, 26 and the top link 29 are rotatably pivoted to the work machine frame 30, respectively. By wearing the work machine B, the work machine B is vertically movable.

As shown in FIGS. 5 and 6, the cushioning mechanism 28 has a cushioning mechanism support 28a projecting from the central upper portion of the rear partition wall W, and the lower rear end of the cushioning mechanism support 28a is inserted therethrough. A rocking plate 92 is rotatably pivoted via a pivot 91, and a spring 93 is interposed between the upper part of the buffer mechanism support 28a and the upper part of the rocking plate 92. By elastically supporting the forward load from the top link 29 pivotally attached to the middle portion of 92, the upward impact that the working machine B receives from the ground is alleviated, and the top link 29 is bent at three points. The link mechanism 8 is prevented from being damaged.

As shown in FIGS. 1, 4 and 5, the elevating mechanism 9 has left and right cylinder support members 35 and 36 formed on the right and left sides slightly above and above the left and right lower link support members 23 and 24. Left and right lifting hydraulic cylinders 3 on bodies 35 and 36 respectively
The bottoms 39 and 40 of the 7,38 are rotatably pivotally mounted, and left and right lift arm supports 52 and 53 are formed on the upper left and right sides of the rear partition W, respectively.
Left and right lift arms 58,5 that are bent in a substantially V shape at 52,53
The front end of 9 is rotatably pivoted, and the left and right lifting hydraulic cylinders 37, 3 are attached to the middle parts of the left and right lift arms 58, 59.
The piston rods 60 and 61 of 8 are pivotally attached to each other, and the rear end of the left lift arm 58 is rocked.
Interlockingly connected to the middle part of the left lower link 25, and connecting the rear end of the right lift arm 59 to the middle part of the right lower link 26 via an ascending / descending connecting rod to connect the left and right lifting hydraulic cylinders 37, 38. By the expansion and contraction operation, the working machine B connected via the three-point link mechanism 8 is moved up and down, and the rocking hydraulic cylinder is moved.
The work machine B is swung left and right by the expansion and contraction operation of 62.

As described above, since the lifting and lowering operation of the working machine B is performed by the left and right lifting hydraulic cylinders 37, 38, the working machine having a wider width and the heavier work than those carried out by one hydraulic cylinder. The lifting and lowering operation of the machine becomes easy, and the left and right balance is improved.

In particular, as shown in FIGS. 3 to 6, 8 and 9, the left and right lower link supports 23, 24 are provided on the rear surface of the rear partition wall W so as to project in a pair of vertically elongated substantially rectangular strips. It consists of the point support plates 23a, 23b, 24a, 24b, and the buffer mechanism support 28
Since a is composed of a pair of left and right cushioning mechanism support plates 28b, 28c projectingly provided on the rear surface of the rear partition wall W, the above six support plates are provided.
23a, 23b, 24a, 24b, 28b, 28c not only support the three-point link mechanism 8, the lifting mechanism 9 and the cushioning mechanism 28, but also function as reinforcing ribs for increasing the strength and rigidity of the rear partition wall W. are doing.

FIG. 7 shows a hydraulic circuit. In the hydrostatic transmission, the left and right hydraulic motors 17, 1 are respectively connected to the variable displacement left and right hydraulic pumps 20, 20 linked with the engine 18.
7 are connected in series so that the left and right hydraulic pumps 20, 20 can be changed in a stepless manner by changing the discharge amount. The left and right hydraulic motors 17, 17 are also variable displacement type, and can be changed to high and low two stages respectively. It is configured to be possible.

In the figure, 50 is a hydraulic pump, 42 is a swash plate control section for controlling the discharge amount of the left and right hydraulic pumps 20, 20,
43 is a hydraulic valve for shifting which is connected to the left and right sub-transmission mechanisms 22 and 22, 51 is a hydraulic valve for braking which controls the hydraulic pressure to the hydraulic servo type brake 21, 54 is a brake pedal, and 55 is a brake pedal.
Is a hydraulic oil tank, 56 is an oil cooler, and 57 is an oil filter.

The left and right lifting hydraulic cylinders 37, 38
Is connected to the hydraulic case 68 connected to the hydraulic pump 50 through the position valve 65, the safety valve 66 and the check valve 67 on the bottom 39, 40 side, and the rod side 69, 7
0 is connected to the hydraulic case 68 via the oil passage switching valve 82 connected to the operation switch 81 arranged in the operation unit 6, so that the operation switch 81 is pressed and the rod side 69, 70
Also, the hydraulic pressure from the hydraulic pump 50 is applied to the hydraulic cylinders 37, 38 for left and right lifting, so that the operating directions of the hydraulic cylinders 37, 38 for left and right lifting can be changed. .

The swing hydraulic cylinder 62 is connected to the hydraulic case 68 via a float control valve 83.

With this configuration, the position valve 65
Operate the bottoms 39,4 of the hydraulic cylinders 37,38 for left and right lifting.
Apply hydraulic pressure to the 0 side to move the left and right lifting hydraulic cylinders 37, 38
The work machine B is raised by extending the work machine B, the position valve 65 is switched, the hydraulic pressure on the bottom 39, 40 side of the left and right lifting hydraulic cylinders 37, 38 is drained, and the work machine B's own weight is used to lift the left and right lifting hydraulic cylinders 37, 38. The work implement B can be lowered by retracting 38.

In particular, when the work implement B is rapidly lowered, the operation switch 81 of the operating section 6 is pressed to cause the hydraulic pressure from the hydraulic pump 50 to the rod sides 69, 70 of the left and right lifting hydraulic cylinders 37, 38. The hydraulic cylinders 37, 38 for raising and lowering the left and right can be rapidly retracted by the action of, and the working machine B can be rapidly lowered.

8 and 9 show a hydraulic case 68. The hydraulic case 68 is attached to the upper surface of the body frame 2 in front of the rear partition W and is located below the seat 5, A plurality of hydraulic valves 65, 66, 67, 83 for raising and lowering and swinging the work implement B are provided on the front and left and right sides of the 68.
Is installed.

In this way, the plurality of hydraulic valves 65, 66, 67, 8
By arranging 3 centrally, hydraulic piping can be shortened and simplified.

Further, as shown in FIGS. 5 and 10, a position rod insertion hole W1 is formed on the upper right side of the rear partition W, and the position rod 65a is inserted into the rod insertion hole W1 so as to be freely inserted and removed. The front end of the position rod 65a is interlockingly connected to the positioning lever 79, the rear end of the position rod 65a is projected rearward of the rear partition wall W, and the rear end of the position rod 65a can be gripped to connect the work machine outside the machine body. From the position, the positioning lever 79 can be operated to move the rear ends of the left and right lower links 25, 26 of the three-point link mechanism 8 up and down to match the height of the connecting position of the working machine B.

Further, as shown in FIGS. 4 and 10, a feedback rod insertion hole is provided on the right side of the central portion of the rear partition wall W.
W2 is formed and the feedback rod 65b is inserted into the feedback rod insertion hole W2 so that the feedback rod 65b can be freely inserted and removed.The front end of the feedback rod 65b is interlockingly connected to the valve shaft 65d of the position valve 65 via the upper arm 65c. The rear end of the rod 65b is interlocked with the right lift arm 59, and when the working machine B reaches the upper and lower limits of the lifting operation, the position valve 65 is returned to the neutral position to stop the lifting operation.

A buffer rod insertion hole W3 is formed on the right side of the rear partition wall W, and the buffer rod 28d is inserted into the buffer rod insertion hole W3 so that the buffer rod 28d can be inserted and removed.
Of the position valve 65 via the lower arm 65e, and the rear end of the buffer rod 28d is connected to the rocking plate 92 of the buffer mechanism 28 so that the working machine B is not obstructed on the ground. When the rocking plate 92 is moved forward and the swing plate 92 is displaced forward, the position valve 65 is switched in the direction of raising the working machine B to raise the working machine B, so that a large impact can be dealt with.

As shown in FIGS. 5, 6 and 10, the buffer rod insertion hole W3 has a buffer mechanism support 28a.
A rear cover interlocking rod 132 that is interlockingly connected to the rear cover 131 shown in FIG. 1 via a relay shaft 130 that is rotatably inserted through
The rear cover interlocking rod 132 has its front end linked to the position valve 65 so that the raising / lowering operation of the rear end of the rear cover 131 can be transmitted to the position valve 65.

Further, as shown in FIGS. 9 and 10, the rear partition wall W has hydraulic hoses to the left and right lifting hydraulic cylinders 37 and 38 and the swing hydraulic cylinder 62 on the inner surface of the rear partition wall W.
An inner connector 102 provided in the middle of 100 and the external hydraulic pressure take-out hose 101 is inserted and fixed, and the outer connector 103 of each of the hoses 100 and 101 can be attached to the outer surface of the rear partition wall W.

Further, as shown in FIG. 10, a rear wall 7a of the cabin 7 is extended obliquely rearward and upward from the upper edge of the rear partition wall W to separate the operating unit 6 and the working machine B from each other.

FIGS. 10 and 11 show the construction of the operating unit 6, in which 41 is a vehicle speed control lever, 63 is an accelerator lever, 71 is an instrument panel, 72 is a one-touch lift lever, 73 is a power takeoff lever, and 74 is Parking lock lever, 75 and 76 are power take-out gear shift levers, 77 is a small storage case, 78 is a mechanical auto draft lever, 79 is a positioning lever, 80 is a lifting height control dial for the working section, and 81 is for rapidly lowering the working section. Operation switch.

As described above, since the hydraulic case 68, to which a plurality of hydraulic valves are attached, is arranged below the seat 5, the operating lever and the like are close to the hydraulic valve. Therefore, the operating lever and the like are provided. It is possible to simplify the interlocking mechanism between the hydraulic valve and the plurality of hydraulic valves.

A hydraulic oil tank 55 is arranged on the left side of the cabin 7, and a fuel tank 10 is arranged on the right side of the cabin 7.
5 are arranged.

As shown in FIGS. 12 and 13, the fuel tank is a box-shaped box having a substantially trapezoidal shape when viewed from the side. A grab rail 10 that forms a bar 107 and extends in the front-rear direction at the same height as the inner surface 108 of the upper surface of the fuel tank 105.
The grab rail 109 is fixed to the outer edge of the upper outer surface 106 of the fuel tank 105 through the downward bending portions formed at the front and rear ends of the grab rail 109.
Functions as a handle when the fuel tank rotates, which will be described later. I am able to place it.

Further, a step plate storage space 111 is provided below the fuel tank 105, and a step plate 112 which can be freely taken in and out is stored in the step plate storage space 111. When the fuel is refueled, the step plate 112 is pulled out, 112 The worker is able to go up and perform refueling work.

Further, the left and right side end portions of the rear wall 7a of the cabin 7 and the vertical pivot shafts 114 and 115 protruding from the left and right side portions of the upper rear surface of the body frame 2 are respectively provided at the upper and lower positions on the inner side rear portion of the fuel tank 105. The upper and lower pivot parts 116 and 117 are pivotally attached to each other, and the fuel tank is centered on the upper and lower pivot shafts 114 and 115.
105 The rear part can be rotated outward.

As shown in FIG. 3, the fuel tank 105
On the back surface of the hydraulic oil tank 55, a tail lamp unit 120 including a reflecting mirror 118 and a direction indicator lamp 119 is arranged with the reflecting mirror 118 inside.

14 to 16 show the crawler 16 and have left and right protrusions 121 and 122 on the upper surfaces on the left and right sides of the central portion, respectively.
An endless crawler 16 is formed by enclosing the outer circumference of a core metal 123 that has been formed with a rubber 124 that extends in the front-rear direction.
125 and 126 are formed, and in particular, the left and right lugs 125 and 126 are raised to enhance the slip prevention effect, and as shown in FIGS. 4 and 5, the front and rear positions of the left lug 125 and the right lug 126 are offset from each other. I feel comfortable.

In FIGS. 15 and 16, reference numeral 127 denotes a tooth insertion hole of the drive sprocket 11.

[0040]

According to the present invention, a rear partition wall is provided upright at the rear end of the machine body frame, a hydraulic case and a hydraulic valve are provided inside the rear partition wall, and a work machine connection is provided outside the rear partition wall. By supporting the front ends of the three-point link mechanism and the lifting mechanism, and by providing a tow hitch on the lower part of the outer surface of the rear bulkhead, the rear bulkhead supports all loads from work machines and other towed objects. Therefore, the supporting structure for the three-point link mechanism and the lifting mechanism can be simplified and rationalized.

Further, by penetrating various rods for feeding back the raising / lowering operation of the working machine to the position valve, the raising / lowering mechanism and the hydraulic valve can be interlocked and coupled without bypassing the rear partition wall. The interlocking mechanism between them can be simplified.

Further, a rear partition wall is erected at the rear end portion of the machine body frame, and a pivotal support portion for supporting the front end portions of the three-point link mechanism for connecting the working machine and the lifting mechanism is projected to the outside of the rear partition wall. By configuring the pair of vertically long and substantially strip-shaped support plates provided, these support plates function as reinforcing ribs, and the strength and rigidity of the rear partition wall can be increased.

Further, by extending the rear wall of the cabin obliquely rearward and upward from the upper edge of the rear partition wall to separate the operating unit from the working machine, the driver is protected from dust and noise from the working machine. be able to.

Further, a rear partition is erected at the rear end of the machine body frame, and a hydraulic hose to the lifting mechanism and an inner connector provided in the middle of the external hydraulic extraction hose are penetrated from the inner surface of the rear partition. Since the outer connector can be connected to the inner connector from the outer surface side of the rear bulkhead, the hydraulic hose can be connected without bypassing the rear bulkhead, and the middle part of the hydraulic hose has a rear portion. It can be supported by a partition wall to prevent damage to the hydraulic hose.

[Brief description of drawings]

FIG. 1 is a side view of an agricultural tractor having a rear partition structure according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a rear view of the same.

FIG. 4 is a side view of a three-point link mechanism and a lifting mechanism.

FIG. 5 is a side view of the buffer mechanism.

FIG. 6 is a plan view of a buffer mechanism.

FIG. 7 is a hydraulic circuit diagram.

FIG. 8 is a plan view of a hydraulic case.

FIG. 9 is a rear view of the same.

FIG. 10 is a side view of a driving unit.

FIG. 11 is a plan view of a driving unit.

FIG. 12 is a side view of the fuel tank.

FIG. 13 is a front view of the same.

FIG. 14 is a partially cutaway side view of the crawler.

FIG. 15 is a bottom view of the same.

FIG. 16 is a front view of the same section.

[Explanation of symbols]

 A Agricultural tractor B Working machine W Rear bulkhead 6 Operating part 7 Cabin 7a Rear wall 8 Three-point link mechanism 9 Lifting mechanism 10 Traveling part frame 19 Traction hitch 23 Left lower pivot 23a Three-point support plate 23b Three-point support plate 24 Lower right pivot 24a Three-point support plate 24b Three-point support plate 28a Buffer mechanism pivot support 28d Buffer rod 65 Position valve 65a Position rod 65b Feedback rod 66 Safety valve 67 Check valve 68 Hydraulic case 83 Flow control valve 28b Support plate 28c Support plate 100 Hydraulic hose 101 External hydraulic outlet hose 102 Inner connector 103 Outer connector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Fujii 1-32, Chayacho, Kita-ku, Osaka-shi, Osaka Yanma Agricultural Machinery Co., Ltd.

Claims (3)

[Claims] 1. A rear partition wall at the rear end of the running frame (10).
(W) upright, and inside the rear bulkhead (W), the hydraulic case (6
8) and hydraulic valves (65) (66) (67) (83)
The front end of the three-point link mechanism (8) for connecting work equipment and the lifting mechanism (9) is supported on the outside of (W), and the rear bulkhead is also supported.
A tow hitch (19) is provided on the lower part of the outer surface of (W), and various rods (65a) (65b) (28d) for feeding up and down the working machine (B) are fed back to the position valve (65). A rear partition structure for agricultural tractors characterized by being penetrated. 2. A rear partition wall at the rear end of the running frame (10).
(W) is erected to support the three-point link mechanism (8) for connecting work equipment and the front end of the lifting mechanism (9) to support the pivots (23) (24) (28
d) projecting outside the rear bulkhead (W), a pair of vertically elongated strip-shaped support plates (23a) (23b) (24a) (24b) (28b)
(28c), and further extending the rear wall (7a) of the cabin (7) obliquely rearward and upward from the upper edge of the rear partition wall (W),
A rear bulkhead structure for an agricultural tractor characterized in that (6) and the working machine (B) are separated. 3. A rear partition wall at the rear end of the running frame (10).
(W) upright, and from the inner surface of the rear bulkhead (W) to the elevating mechanism (9) hydraulic hose (100) and external hydraulic extraction hose (1).
The inner connector (102) provided in the middle part of (01) is penetrated and fixed, and the outer connector (103) can be connected to the inner connector (102) from the outer surface side of the rear bulkhead (W). Rear bulkhead structure for agricultural tractors.