JPS59190044A - Hydraulic piping structure for farm tractor - Google Patents

Abstract

PURPOSE:To install an adapter at the side of a machine body and make an interval ranging from this part to a cabin into a flexible pipe as well as to reversely make the interval ranging from the adapter to an actuator of the machine body into a steel pipe. CONSTITUTION:When stepping on each brake pedal at both sides, hydraulic pumps at both sides are pressed in whereby pressure oil is fed to relay metal devices 81 and 80 of an adapter 50 from each of pressure oil ports 8a and 8b via flexible pipes 57 and 58. Herefrom, the pressure oil is handed over to steel pipes 55 and 56 from these flexible pipes 57 and 58 and fed to each of actuators 59 and 60 of a rear axle housing. With operation on these brake pumps, hydraulic fluid becomes decreased in quantity so that drain oil of the pressure oil for lift arm control use is fed for covering this decrement via a steel pipe 52. This steel pipe 52 also is handed over to the adapter 50, turning to a flexible pipe 53, thus drain oil is fed to a hydraulic pump unit 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic piping structure for a Toyokawa tractor with a cabin.

In conventional agricultural tractors (R1), it is rare to be equipped with a gear bin device, and the cabin is generally
The structure was such that it could be installed later as an accessory.

However, 17. 1 for large tractors means that they are attached later (d), and from the point of view of comfort, they are often organically combined with the tractor body from the beginning as parts that make up the tractor. It is.

In such a case, it is better to attach the 7g (steering device, brake pedal, and clutch pedal) inside the cabin to the cabin VCP to isolate the vibrations of the aircraft, and also to seal out the outside air. (However, it is better to support parts that protrude into the cabin in the cabin.In the present invention, (RF, dash board, steering device, brake pedal, clutch pedal) are supported in the cabin (
In order to isolate the cabin including these from the transmission case, clutch housing, and rear axle case, it is possible to insert anti-vibration rubber between the two, and to isolate the cabin including these from the transmission case, clutch housing, and rear axle case. Since the steering hydraulic system is fixed on the cabin side and the actuator side is on the fuselage side, the pipes interposed between the two are subject to vibration.

It is necessary to make this part a flexible pipe, and in the present invention, an adapter is provided on the fuselage side, and a 1r:l: flexible pipe is provided from this part to the cabin, and the reverse (between the m adapter and the actuator of the fuselage is conventional). It is a copper pipe such as a straight steel pipe.

Purpose of the Invention 1rl - as in "Attachment 1ζ1"
The structure of the tumor body according to the present invention will be explained with reference to the drawing of the actual example shown in the first zodiac plane.

Figure 1゛・r Overall side view of tractor with cabin side
Side sectional view of part 1△1 of the dashboard inside the cabin at the entrance of the river, ・(＜Figure 3・d Also a rear view, Do': /l
IX+ is the front cross section of Kura Sochi housing: ㅅ1. Figures 5-1 and 1-1 are also side views, and Figure 6 is a hydraulic circuit diagram of the agricultural l/rafter.

In Fig. 1, the interior of the cabin (12) (I') is protruding from the back board (△) of the bonnet ioH.
The AI is integrated with the frame of the cabin (42)17, the cabin (4?) can be tilted backwards around the pivot point, and when the front of the cabin is turned P1, the Da Sonyu board TAI can also be lifted upwards with the cabin. The clutch housing (44) and transmission case are exposed, making it easy to carry out repairs and inspections.
Mokura and Sochi pedals (5) are both Datsush board f and A
l or cabin and 44:[configured 17 to be lifted upwards.

FIGS. 2 and 3 (in C, description of the structure near the push board iAl-4-7). A frame body (fixed to 421) of the Dashboard fA1 (cabin) 421. A windbreak plate r9a) is provided on the frame body (42)t, and
Soshboard IAI is included. The main parts of the present invention are a hydraulic brake hydraulic pump (8), a power steering hydraulic adapter (9b), and a hydraulic adjustment valve (9).
C) is attached to this windbreak plate (9al), and is lifted and tilted upward along with the cabin;
It is possible.

Place the da soshu board + A, l on the left and right and attach the pivot shaft (12
1, brake pedals (6) and (7) are provided on the right side of this pivot shaft (12), and a clutch pedal (5) is provided on the left side.

Arm 1211 is activated by depressing the clutch pedal (5).
, link 19?1, arm 123), and the main clutch in the clutch housing (44) via the link (33)...
ff4) is connected and disconnected.

Link + in conjunction with the depression of the franchise pedal (5)
241 (In the case of 241, an inertia slip prevention brake device for the main clutch shaft is provided via 24+. In the case of 241, bell crank 1261, link f3nl 'Th
Through this, the liquid ball valve (6q) is controlled 17, and the brake cylinder (73) brakes the idle rotation. Link[
24'; in this case, the arm 125 is placed at the pivot point (25a
) is the center of rotation 12, which brakes idling, which is an exception depending on the model. A link (31) pivoted in the middle of the flanch pedal (5) is equipped with a biasing spring in the longitudinal direction, and when the clutch pedal is depressed and disengaged and goes beyond 6, a force is applied in the depressed direction. j'f+11 The role of reducing the stepping force is 1~.

Next, the action of the brake pedal (1'il [71], to be clear).

When the left and right brake pedals are depressed, the left and right hydraulic pumps are pushed in and pressurized oil flows to the pressure oil port (Ra), as shown in Figure 6.
From (8b), connect the adapter (50' relay fitting (8+)!8n) via the flexible pipe (571j5R).
sent to.

From here, the steel vibe IJ (56) is inherited and the rear axle housing actuator (Fi91 Inn)
The oil is sent to The hydraulic pump device (81 contains an equalizer device that equalizes the pressure when the left and right brake pedals are depressed at the same time).

As the brake pump is operated, the amount of hydraulic oil decreases, so drain oil for the lift arm control pressure oil is sent through the steel pipe (52).

This <'! The pipe (U9) is also received by the adapter β0 and becomes a flexible pipe (53), and the oil is not sent to the hydraulic pump device (8).

The steering handle (1) has a universal joint device (12) built into the inside of the support (111), and for this rotation, it can be bent and tilted forward and backward (in the center).
I'm 7. Rotation i+1! , tl (11E3 is provided with a tilt lever (2゛. fl 3+ Ir, l,
This is a spring that biases the tilt lever in the fixed direction. A hydraulic valve /1lrl for steering is provided at the lower end of the steering bar 1 on the lower side of the universal joint, and the oil section is controlled in the hydraulic valve /lb). The adapter (9h) sends pressure oil from the hydraulic pump in the engine section to the flexible pipe 1f trowel A11, 'j''%l pipe r9qR9e) 17 Te hydraulic half f11]). Pressure after control. Oil hook pipe (9f)
It is sent to the oil pressure adjustment valve (9C) at r9g3.

In (9C), if an obstacle hits the front wheels during forward movement, a force is applied to the steering actuator to increase the pressure oil to high pressure, so a hydraulic pressure adjustment (rqc) is provided to escape this high pressure. This adapter/9b) is connected to the hydraulic pump, and the hydraulic adjustment valve (9c) is connected to the steering actuator using flexible pipes.
Chill in the cabin) WoriT Noh.

+31 and +41 in FIG. 3 are PTO clutch levers for connecting and disconnecting the PTO hydraulic clutch; i411d; height and low speed change levers for high and low speed change operations;

Each is connected to a hydraulic valve (34) on the second side of the transmission case via a wire (37) (36'k).

(circle) is the foot accelerator pedal, Qfilid is the accelerator lever, arm (+5a), 7-mu Oa+,
7-mu(1)'l! , I), 7 (171 etc.'i) to adjust the throttle of the engine (76).

Figure 26 shows the hydraulic circuit of the present invention. Hydraulic pump (7
71 and hydraulic pump (78 + ld: Hydraulic pump for each hydraulic clutch device, which branches and sucks the lubricating oil sucked through the line filter (70). Pressure oil of the hydraulic pump (77) is the hydraulic valve for the PTO clutch (
68), the PTO hydraulic clutch (90) and the PT
O-shift lock cylinder (91) and PTO shaft inertia slip prevention cylinder! Send pressure oil to 99'l. In addition, the pressure oil created by suction by the hydraulic pump □□□ passes through the hydraulic valve (69) of the front wheel 1st drive stage clutch (69a) and enters the hydraulic valve (671) for high/low gear shifting.Hydraulic valve ( The pressure oil controlled by 6η is sent to the hydraulic clutch (71++7Z) for high/low speed change via the pipe (61).The pressure oil that has passed through the hydraulic valve U is sent to the hydraulic valve (6) of the inertial slip prevention j-H.
The controlled pressure oil enters the hydraulic cylinder (73) for 1F during inertia idling. Drain oil of hydraulic valve (66), relief valve (in adapter (51))
Lubricating oil enters the oil cooler (75) in front of the radiator through the flexible pipe (63), then returns to the adapter and lubricates the main latch shaft from the side of the clutch housing (44) through the pipe (6?). Oil and 1.
is discharged.

Among agricultural tractors with a cabin that covers the seat area with a cabin, a hydraulic pump or hydraulic valve is fixed in a part of the cabin, and part of the actuator is fixed to the body side of the agricultural tractor, such as the case. In this case, an adapter was installed on the aircraft side, and the adapter was connected either between the cabin and the adapter or from the adapter to the actuator side of the aircraft using a flexible pipe, etc., so it was possible to connect the hydraulic pump for hydraulic brakes or the hydraulic system for power steering. When the adapter is fixed to the cabin side, the cabin is supported by anti-vibration rubber, etc., and vibrates separately from the aircraft.The difference between the two is that the flexible pipe between the adapter and the hydraulic system This flexible pipe will follow the tilt of the cabin even when the cabin is to be lifted up for repair and inspection, making it easier to configure the cabin tilt. This is convenient when designing as part of the aircraft as a standard specification.

In addition, since the adapter is fixed to the clutch housing wall, the front end of the cabin is located exactly above the clutch housing, and the dash board is also located on the Kura Sochi housing, so the clutch housing on the aircraft side and the cabin This is advantageous because it is possible to use an adapter fixed to this clutch housing as an intermediate point for connecting the side dash board with a pipe. or,
In the structure of the present invention, the clutch pedal and the brake pedal are located above the side wall of the clutch housing section, and are not located below, so there is sufficient space so that they can be mounted with ease. It can be done.

In addition, a hydraulic adjustment valve was installed on the cabin side, similar to the hydraulic pump for brakes and the hydraulic valve for power steering, so that the cabin and the steering handle and
It was possible to install a brake pedal and a brake pedal, making it possible to tilt the cabin together with the board for inspection and repair.

In addition, as replenishment oil for the hydraulic brake system, drain oil from the pressure oil for rotating the lift arm of an agricultural tractor was used, and the drain circuit was connected to the hydraulic pump on the cabin side through an adapter, so the hydraulic pump for the hydraulic brake was used. If it is fixed to the cabin side, the replenishment oil cannot be taken out from the transmission case and a pressure of S degree is required, but by using the drain oil of the hydraulic system for the lift arm, This is a good option because it has good pressure and enough oil in the drain. In addition to being used as supplementary oil, the surplus oil is also recycled as lubricating oil in the transmission case, so it is very effective for this purpose.

[Brief explanation of the drawing]

Figure 1 is a side view of the tractor with a cabin. Figure 2 is a side cross-sectional view of the board (Δ) inside the gear bin. Figure 3 is the rear view. Figure 4 is a front cross-sectional view of the clutch housing. Figure 25 is also a side view. Figure 6 is a hydraulic circuit diagram of the intestinal tractor. (^) Dash board ill Steering handle (5, clutch pedal + (ilF?+ Brake pedal (8) - Hydraulic pump for hydraulic brake (9a) - Windbreak plate f9b), Adderfree for power steering (9C)
...Oil field regulating valve for power steering (42)/cabin (44)--Clutch housing @0)
Adapter (53) j57) (Till/Flexible pipe (1)
'i2j (fin (56) Metal pipe applicant Yanmar Diesel Co., Ltd. agent Patent attorney Toshikazu Yano (13) 291

Claims (1)

[Claims] (Agricultural tractor with a cabin that covers the periphery of the 11-seat seat with a cabin, in which a hydraulic pump or hydraulic pulp is fixedly installed in a part of the cabin, and part of the actuator is attached to a machine such as a mission case of the agricultural tractor. Hydraulic pressure for an agricultural tractor characterized in that an adapter is provided on the machine body side in addition to the one fixed on the side, and either the gear pin and the adapter or the adapter and the machine body are connected with a flexible pipe. Piping structure. Queen pipe structure. (3) Claim 1, characterized in that a hydraulic pump for brakes and a hydraulic valve for power steering, as well as a hydraulic pressure adjustment valve, are provided on the cabin side. Hydraulic piping structure of the agricultural tractor described. 14 Using drain oil of the oil for rotating the lift arm of the agricultural tractor as replenishment oil for the hydraulic brake device,
A hydraulic piping structure for an agricultural tractor according to claim 1, wherein the drain oil circuit is connected to a hydraulic pump on the cabin side through an adapter.