JPH0220458B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a hydraulic piping structure for an agricultural tractor with a cabin.

(b) Prior Art It is rare for conventional agricultural tractors to be equipped with a cabin device, and the cabin was generally constructed so that it could be attached later as an accessory.

Therefore, the brake pedal and the hydraulic pump for the hydraulic brake were all fixed to the tractor's body side, so in order to be able to operate the brake pedal by pressing it inside the cabin, it was necessary to protrude into the cabin from a pivot point outside the cabin. This is necessary, and the cabin requires a long hole through which the brake pedal can rotate.

As a result, the cabin was poorly sealed and air conditioning was difficult.

(c) Problems to be solved by the invention However, in large tractors, the cabin is rarely installed later, and from the viewpoint of livability, the cabin is organically connected to the tractor body from the beginning as a component of the tractor. There were more and more things to do.

In such cases, it is better to attach the brake pedal, which is a part inside the cabin, to the cabin, in order to isolate vibrations from the aircraft, and also to seal out the outside air. It is better to support the

In the present invention, when the brake pedal and the hydraulic pump for the hydraulic brake are integrated into the cabin as described above, in order to isolate the cabin from vibrations of tractor body parts such as the transmission case, clutch housing, and rear axle case, A vibration-proof rubber is interposed between the two.

If anti-vibration rubber is installed between the cabin 42 and the fuselage side, the cabin 42 and the fuselage will vibrate differently, so the pipe interposed between the hydraulic pump of the hydraulic brake and the brake actuator will have an adverse effect. Therefore, it is necessary to absorb this difference in vibration.

In addition, in order to facilitate inspection and repair of the cabin, if it is made tiltable around the pivot point at the rear, it becomes necessary to remove the pipe interposed between the hydraulic pump of the hydraulic brake and the brake actuator each time. It happens.

In order to solve this problem, the present invention allows a flexible pipe to be interposed between the hydraulic pump of the hydraulic brake in the cabin and the brake actuator.

That is, a relay adapter is provided on the fuselage side, and a flexible pipe is used between this part and the cabin to enable tilting and rotation and absorb vibrations.

(d) Means for Solving the Problems The objects of the present invention are as described above, and the configuration for achieving the objects will now be explained.

In an agricultural tractor in which the seat periphery is covered with a cabin 42 and the cabin 42 can be tilted and rotated around a rear pivot point, brake pedals 6 and 7 and a hydraulic pump 8 of a hydraulic brake are fixed to a part of the cabin 42. The brake actuators 59 and 60 are fixed to the body side of the agricultural tractor, and the relay adapter 50 is also fixed to the body side, and between the cabin 42 and the relay adapter 50, a flexible pipe 57, 58.

(e) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is an overall side view of the tractor with a cabin 42, FIG. 2 is a side sectional view of the dash board A section inside the cabin 42, FIG. 3 is a rear view, and FIG. 4 is a front sectional view of the clutch housing.
FIG. 5 is a side view, and FIG. 6 is a hydraulic circuit diagram of the tractor.

In FIG. 1, a dart board A at the rear of the bonnet 43 protrudes into the cabin 42;
This dart board A is integrated with the frame of the cabin 42, so that the cabin 42 can be tilted about its rear pivot point for inspection and repair.

When the front of the cabin 42 is lifted upward and rotated, the dart board A is also lifted upward together with the cabin 42, exposing the clutch housing 44 and transmission case that make up the body of the tractor, so that repairs and inspections can be easily performed. ing.

Of course, the steering handle 1, the brake pedals 6, 7, and the clutch pedal 5 are configured so that they can be lifted upward together with the dash board A and the cabin 42.

In FIGS. 2 and 3, the structure around the dash board A will be explained.

The dart board A is fixed to the frame of the cabin 42. That is, a windbreak plate 9a is provided on the frame, and the dash board A is integrated with this.

Hydraulic brake hydraulic pump 8, power steering hydraulic adapter 9b, and hydraulic adjustment valve 9c
is attached to this windbreak plate 9a, and can be lifted up and tilted together with the cabin 42.

Pivot shaft 1 facing the left and right direction of the dart board A
2, 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. When the clutch pedal 5 is depressed, the arm 21, link 22, arm 23, link 3
3, the main clutch device 74 in the clutch housing 44 is connected and disconnected.

An inertial slip prevention brake device for the main clutch shaft is provided in conjunction with depression of the clutch pedal 5 via links 24 and 24'. Link 2
In the case of No. 4, the hydraulic valve 66 is controlled via the bell crank 26 and the link 30, and the brake cylinder 73 brakes the inertial idling.

In the case of the link 24', the arm 25 is rotated about the pivot point 25a to mechanically control inertial idling. A link 31 pivotally supported in the middle of the clutch pedal 5 is equipped with a biasing spring in the extension direction, and when the clutch pedal is depressed and passes over the fulcrum, a force is applied in the depression direction to reduce the depression force. It has a role to play.

Next, the action of the brake pedals 6 and 7 will be explained.

When the left and right brake pedals 6, 7 are depressed, the hydraulic pump 8 of the hydraulic brake is pushed in, and the pressure oil is pumped from the pressure oil ports 8a, 8b through the flexible pipes 57, 58 to the tractor body side, as shown in FIG. It is sent to the relay fittings 81, 80 of the relay adapter 50 which is fixed to the clutch housing 44 that constitutes the clutch housing 44.

From here, the oil is transferred to steel pipes 55, 56 and sent to brake actuators 59, 60 provided in the rear axle housing.
The hydraulic pump device 8 includes 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 steel pipe 52 also serves as the clutch housing 44.
is inherited by a relay adapter 50 fixed to the
It becomes a flexible pipe 53, and drain oil is sent to the hydraulic pump device 8 of the hydraulic brake.

Further, the steering handle 1 has a universal joint device built into the support body 11, and can be bent and tilted back and forth about the rotation axis 10.

The bending and tilting of the steering handle 1 is not related to the tilting rotation for inspection and repair of the clutch housing 44, but is a tilting rotation to match the physique of the operator. A tilt lever 2 is provided on the rotation shaft 10. A spring 13 biases the tilt lever in the fixed direction.

A hydraulic valve 1b for steering is provided at the lower end of the steering shaft below the universal joint, and hydraulic control is performed within the hydraulic valve 1b. Pressure oil is sent to the adapter 9b from a hydraulic pump in the engine section through a flexible pipe, and is sent to the hydraulic valve 1b through steel pipes 9d and 9e. Pressure oil after control is also steel pipe 9
f and 9g are sent to the oil pressure regulating valve 9c.

In the hydraulic valve 1b, there is provided a hydraulic pressure regulating valve 9c to escape the high pressure that is exerted on the steering actuator when an obstacle hits the front wheels when the vehicle is moving forward. The adapter 9b is connected to the hydraulic pump, and the hydraulic pressure adjustment valve 9c is connected to the steering actuator by flexible pipes, thereby making it possible to tilt and rotate the cabin.

3 in Figure 3 is the PTO for connecting and disconnecting the PTO hydraulic clutch.
The clutch lever 4 is a high/low speed change lever for high/low speed change action.

They are linked to hydraulic valves 35 and 34 on the upper surface of the transmission case via wires 37 and 36, respectively. 19 is the foot accelerator pedal, 15
is an accelerator lever, which adjusts the throttle of the engine 76 via arm 15a, arm 16, arm 18, link 17, etc.

Figure 6 shows the hydraulic circuit.

Hydraulic pump 77 and hydraulic pump 78 are hydraulic pumps for each hydraulic clutch device, and branch lubricating oil sucked through line filter 70 to suck it.

Pressure oil from the hydraulic pump 77 is supplied to the PTO hydraulic clutch 90 via a hydraulic valve 68 for the PTO clutch.
Also, pressure oil is sent to the PTO shift lock cylinder 91 and the PTO shaft inertia slip prevention cylinder 92.

Further, the pressure oil discharged by the hydraulic pump 78 passes through the hydraulic valve 69 of the front wheel drive clutch 69a and enters the hydraulic valve 67 for high/low speed change.

The pressure oil controlled by the hydraulic valve 67 is transferred to the pipe 6.
1, a hydraulic clutch 71, 7 for high/low shifting
2 will be sent.

The pressure oil that has passed through the hydraulic valve 67 enters the hydraulic valve 66 for preventing inertial idling, and the controlled pressure oil enters the hydraulic cylinder 73 for preventing inertial idling. Drain oil from the hydraulic valve 66 passes through the relief valve 65 in the adapter 51 and then flows into the flexible pipe 63.
It enters the oil cooler 75 in front of the radiator, then returns to the adapter and is discharged from the side of the clutch housing 44 through the pipe 62 as lubricating oil to the main clutch shaft.

(F) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, when the brake pedals 6, 7 and the hydraulic pump 8 of the hydraulic brake are fixed to the cabin side,
The cabin is supported by anti-vibration rubber, etc. relative to the fuselage, so it vibrates differently from the fuselage.

Therefore, due to the difference in vibration between the two, when pipes are normally installed, the pipes break or crack.

In the present invention, this difference in vibration is absorbed by the flexible pipes 57 and 58 interposed between the relay adapter 50 fixed to the clutch housing 44 on the fuselage side and the hydraulic pump 8 of the hydraulic brake. It no longer breaks or cracks.

Second, even when the cabin is to be tilted to be lifted up for repair and inspection, this flexible pipe will bend to follow the tilt of the cabin, making the configuration for tilting and rotating the cabin simple. This is convenient when designing the cabin as a standard specification as part of the aircraft.

Thirdly, by pivotally supporting the brake pedals 6, 7 and the hydraulic pump 8 of the hydraulic brake on the side of the cabin 42, the brake pedal, which was conventionally supported on the fuselage side such as the clutch housing, can be moved into the cabin installed later. Since there is no need to provide an elongated hole that protrudes into the cabin 4 and allows it to rotate up and down,
This improves the airtightness of the cabin 42 and improves the efficiency of air conditioning within the cabin 42.

[Brief explanation of drawings]

Fig. 1 is an overall side view of the tractor with a cabin, Fig. 2 is a side sectional view of section A of the dash board inside the cabin, Fig. 3 is a rear view, and Fig.
The figure is a front sectional view of the clutch housing, FIG. 5 is a side view, and FIG. 6 is a hydraulic circuit diagram of the tractor. A... Dash board, 6, 7... Brake pedal, 8... Hydraulic pump for hydraulic brake, 9a
...Windbreak plate, 42...Cabin, 44...Clutch housing, 50...Relay adapter, 5
3,57,58...Flexible pipe, 52,
55, 56... Metal pipe, 59, 60... Brake actuator.

Claims (1)

[Claims] 1. In an agricultural tractor in which the seat periphery is covered with a cabin 42 and the cabin 42 can be tilted and rotated around a rear pivot point, the cabin 42
The brake pedals 6, 7 and the hydraulic pump 8 of the hydraulic brake are fixed to a part of the tractor, the brake actuators 59, 60 are fixed to the body side of the agricultural tractor, and the relay adapter 50 is also fixed to the body side. A hydraulic piping structure for an agricultural tractor, characterized in that a cabin 42 and a relay adapter 50 are connected by flexible pipes 57 and 58.