JP2601440Y2 - Quick turn equipment for mobile farm equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quick-turn device for braking one of the rear wheels when turning a headland or the like.

[0002]

2. Description of the Related Art Conventionally, in a mobile agricultural machine such as a tractor, when a steering angle exceeds a predetermined value such as when turning on a headland, a brake for a rear wheel inside a turning radius is actuated by hydraulic pressure to minimize A device capable of turning with a radius (hereinafter, referred to as
"Quick turn device") is used.

[0003]

However, since this type of device is operated by hydraulic pressure, there is a possibility that the hydraulic pressure for operating other hydraulic equipment (for example, power steering, hydraulic lift) is insufficient when the brake is operated. was there. Further, in the case of retrofitting the quick turn device, with plumbing for oil leakage or the like is complicated, after
There are also concerns about the placement of mounting equipment and the effects of heat from the engine.
You .

[0004] Therefore, an object of the present invention is to provide a quick-turn device for a mobile agricultural machine, in which the quick-turn device is driven by air to prevent a shortage of hydraulic pressure and complicated piping when retrofitting. Is what you do.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has an engine in a hood (5a).
A gin (E) and a radiator (8);
In the mobile agricultural machine (1) having a pair of left and right brake pedals (30, 40) for driving the running wheels by the driving force of (E) and braking the left and right rear wheels (3a, 3b), respectively, the front wheels (3a And a switching valve (50a, 5) which is switched by a signal from the turning angle detecting means.
0b), a compressor (9) for supplying air to the switching valve, and a pair of brake actuators (37, 47) driven by air supplied via the switching valves (50a, 50b). When the turning angle of the front wheel (3a) becomes a predetermined angle, one of the pair of brake actuators (37, 47) is driven, and the brake inside the rotation is activated. None to operate, further, the switching
The valve (A) and the compressor (9) are connected to the radiator
Placed in front of the engine (E) with the
It was characterized by.

In this case, the switching valve (50a, 5
0b) and the brake actuator (37, 47)
A throttle valve (53, 53) is interposed between the transmission device (4) and the switch (63) that is turned off during high-speed running in the transmission (4). It is preferable that a brake operation by the actuator (37, 47) be stopped during high-speed running.

[0007]

According to the above construction, when the turning angle of the front wheel (3a) becomes a predetermined angle during traveling of the mobile agricultural machine (1), the turning angle detecting means (7) disposed on the front wheel detects the turning angle. The switching valves (50a, 50b) are switched by a signal from the turning angle detection means (7). Then, the supply path of the air supplied from the compressor (9) is switched, and one of the actuators (3, 37) of the pair of brake actuators (37, 47) is switched.
7, 47) is driven to operate the brake inside the rotation. Also, the compressor 9 and the valve assembly A
A radiator 8 is arranged between the engine E and the engine E.
Therefore, the heat of the engine E is cut off by the radiator 8,
Compressor 9 etc. are less affected by heat of engine E
No. Furthermore, a battery is generally provided in the front portion of the hood 5a.
B is arranged, but the space beside the battery B
Is usually empty, and the compression
By disposing the valve 9 and the valve assembly A,
Effective use of space is achieved.

The reference numerals in parentheses above are for comparison with the drawings, but do not limit the configuration of the present invention.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a tractor 1 as a mobile farm machine has front wheels 2a and 2b and rear wheels 3a and 3b.
And a traveling body 5 supported by the
A transmission (transmission) 4 provided with a traveling clutch (not shown) is disposed below the vehicle. On the other hand, as shown in detail in FIG. 2, a turning angle sensor (turning angle detecting means) 7 having a pair of front and rear detecting portions is provided on the left front wheel 2a.
The steering angle sensor 7 detects that the left front wheel 2a has the maximum steering angle (for example, about 40 degrees) based on the fact that the knuckle arm 6 comes into contact with one of the detection units by being fully steered in one of the left and right directions. Degrees). In this embodiment, one of the brakes of the rear wheels 3a and 3b is operated based on a signal from the turning angle sensor 7, and constitutes a so-called quick turn device.

An engine E, a radiator 8 and a battery B are provided in the hood 5a in front of the traveling machine body 5 (the left side in FIG. 1; the same applies hereinafter).
Are arranged along the direction of travel. That is, a radiator 8 is disposed in front of the engine E in the hood 5a, and a battery B is disposed in front of the radiator 8 in the hood 5a, as shown in detail in FIG.
Is arranged. Further, a compressor 9 driven by a battery power supply is disposed on the left side of the battery B, and a valve assembly A is disposed on the right side of the battery B.
Is arranged. This valve assembly A is shown in FIG.
As shown in detail in FIG. 2, a switching valve (right brake valve 50a,
Left brake valve 50b and clutch valve 51)
A pneumatic device such as a filter regulator R is mounted on the base plate.

On the other hand, as shown in detail in FIG.
Below the floor 5b, the relatively mud
An air tank T is attached to a location not exposed to water. The air tank T is interposed between the compressor 9 and the filter regulator R (see FIG. 8), and temporarily stores air from the compressor 9. It is configured as follows. As described above, the air devices such as the compressor 9, the valve assembly A, and the air tank T
a, or below the floor 5b, and is configured to supply air to the brake cylinders (brake actuators) 37, 47 and the clutch cylinder 27 to operate them, as described later. .

On the other hand, as shown in FIG. 1, a steering wheel S is provided upright behind the hood 5a, and a driver's seat 10 is provided behind the steering wheel S. The main switch 1 is located at the lower right of the driver's seat 10.
3 and a brake switch 15 are arranged so that when these switches 13 and 15 are turned on, the quick-turn device operates (details will be described later). The main shift lever 11 is located on the left side of the driver's seat 10.
And a shuttle lever 12 are provided upright, and the transmission 4 can be shifted based on the operation of these levers 11 and 12. here,
Push-type switches 11a and 12a are attached to the grip portions of these levers 11 and 12, respectively.
When these switches 11a and 12a are pressed, the traveling clutch is disengaged by the air from the compressor 9 to enable gear shifting. Further, relays 60, 61, 62, 65 (see FIG. 7) operated by these switches 11a, 12a, 13, 15 and the like are appropriately arranged (details will be described later).

On the other hand, below the steering wheel S, as shown in FIG.
Are swingably supported, and these pedals 30, 4
As shown in FIG. 6, brake rods 31, 41, brake links 32, 42 and brake rods 33, 43 are sequentially connected to the respective ends of the brake pedal 30, and when the brake pedals 30, 40 are depressed. The brakes of the left and right rear wheels 3a and 3b are configured to operate. Brake cylinders 37, 4 are provided below the floor 5b.
7 are swingably supported, and the rods 37a, 4
A member 3 having long holes 38a, 48a
8, 48 are attached. On the other hand, the arm members 3 are attached to the brake links 32 and 42 so as to rotate integrally.
The arm members 36 and 46 are provided with pins 36a and 46a, respectively. Therefore, when the brake pedals 30, 40 are depressed, the pins 36a, 46a move in the elongated holes 38a, 48a, so that the clockwise rotation of the arm members 36, 46 is not hindered and the brake operates smoothly. It is supposed to be. The brake cylinders 37 and 47 are operated based on the detection signal from the above-mentioned turning angle sensor 7 to constitute a quick turn device.

In the tractor 1 according to the present embodiment, the traveling clutch in the transmission 4 operates by depressing the clutch pedal 20 and also operates by air as in the case of the brake pedals 30 and 40 described above. Is configured. That is, the clutch pedal 2 disposed between the brake pedals 30 and 40
6 is connected to the clutch arm 25 via the clutch rod 21, the clutch link 22, and the clutch rod 23, as shown in detail in FIG. 6, so that the clutch arm 25 is rotated by the depression operation of the clutch pedal 20. Have been. A clutch cylinder 27 is swingably supported by a chassis frame 5c arranged below the floor 5b, and the traveling clutch is operated by driving the clutch cylinder 27.
The clutch cylinder 27 and the clutch link 2
The coupling structure with the clutch cylinder 2 is the same as that of the above-described brake. The clutch cylinder is provided via a member 28 having an elongated hole 28a and an arm member 26 fixed to the clutch link 22 and having a pin 26a protruding therefrom. 27 and the clutch link 22 are connected. When the clutch pedal 20 is depressed, the rotation of the arm member 26 in the clockwise direction is not hindered because the pin 26a moves in the elongated hole 28a, and the clutch arm 25 operates smoothly. On the other hand, when the clutch cylinder 27 is operated to contract the rod 26a, the arm member 2
6 is rotated clockwise, and the clutch arm 25 is also operated. The clutch cylinder 27 has cylinder switches 29a and 29a.
b is attached, and detects the operating state of the clutch based on detecting the position of the sliding piston 27b (details will be described later). The cylinder switches 29a and 29b are movably mounted, and the positions thereof are appropriately changed so that the connection of a traveling clutch described later is performed smoothly.

Next, an air circuit and an electric circuit for operating these brakes and clutches will be described with reference to FIGS.

The air passage downstream of the filter regulator R is branched into three, as shown in FIG.
A right brake valve (switching valve) 50a and a left brake valve (switching valve) are provided in each air passage.
50b and a clutch valve 51 are interposed to selectively supply air from the air tank T to the clutch cylinder 27 to interrupt the traveling clutch or to operate the brake via the brake cylinders 37 and 47. It is configured as follows. Further, these valves 50a, 50b, 51
Are mounted with silencers 52, 52, 52, and throttle valves 53, 53 are interposed between the left and right brake valves 50a, 50b and the brake cylinders 37, 47, respectively. Further, an air passage downstream of the clutch valve 51 is branched into two and communicates with the clutch cylinder 27, and a half-clutch valve 55 is interposed in one of the air passages. The half-clutch valve 55 is connected to a throttle valve-equipped exhaust path 57 in which a throttle valve-equipped silencer 56 is arranged.

On the other hand, the electric circuit of this embodiment is configured as shown in FIG. 7, and when the main switch 13 is turned on, the relay 60 is excited and the compressor 9 is driven. When the switches 11a and 12a attached to the main shift lever 11 and the shuttle lever 12 are turned on, the relay 61 is operated and the clutch valve 51 is switched as shown in FIG. When the switches 11a and 12a are turned off, the relay 61 is immediately turned off, the clutch valve 51 is switched, and the traveling clutch is connected.

When the traveling clutch is connected, the piston 27b of the clutch cylinder 27 is detected by the cylinder switch 29b, and the half-clutch valve 55 is switched. At this time, the cylinder switch 2 is moved with the movement of the piston 27b.
9b is turned off, but the relays 62 and 65 are energized to hold the half-clutch valve 55 in the switching position. In addition, piston 2 continued to move
7b is detected by the cylinder switch 29a, the relays 62 and 65 are turned off, and the half-clutch valve 5 is turned off.
5 is returned to the original position.

On the other hand, when the brake switch 15 is turned on to enable a quick turn, the turning angle sensor 7
Brake valve 50a or 50b based on the ON signal of
Are switched, and the left and right brakes are selectively operated in response to the switching. Here, reference numeral 63 in the figure denotes a high-speed switch provided in the transmission 4, which is turned off when the tractor 1 is running at a predetermined speed or higher (for example, when the sub-shift is in the H range), and is quick. The turn function is not activated.

Next, the operation of the quick-turn device according to this embodiment will be described.

When the main switch 13 is turned on, the relay 60 is excited to drive the compressor 9 as shown in FIG. 7, and the air from the compressor 9 is supplied to the brake valve via the air tank T and the filter regulator R. It is supplied to 50a, 50b (see FIG. 8). When the brake switch 15 is turned on, a quick turn is possible. That is, when the tractor 1 is operated and the steering S is fully turned in one of the left and right directions (for example, 40 degrees), the knuckle arm 6 comes into contact and the turning angle sensor 7 is turned on. Then, one of the brake valves 50a, 50b is driven according to the steering direction, the brake of the rear wheel inside the rotation is activated, and the traveling body 5 turns with the minimum radius. More specifically, when the steering wheel S is fully turned to the left, the brake of the left rear wheel 3a is activated and the rear wheel 3a is locked (see FIG. 9). Then
As is well known, the right rear wheel 3b rotates at a double speed by the action of a differential gear (not shown), and as a result, the traveling machine body 5 turns with a minimum radius. Then, when the steering wheel S is returned, the steering angle sensor 7 is turned off, the braking operation is stopped, and the left and right rear wheels 3a and 3b rotate at a constant speed. Here, when the tractor 1 is traveling at a predetermined speed or higher, the high-speed switch 63 is turned off, so that the above-described quick turn function does not operate.

Next, the operation when the traveling clutch is operated by the push switches 11a and 12a at hand will be described.

When the main switch 13 is turned on, the compressor 9 is started and air is sent to the clutch valve 51 in the same manner as described above. However, switch 11
When a and 12a are off, the relay 61 operates as shown in FIG. 7, so that only the return solenoid is excited and the clutch valve 51 assumes the position shown in FIG. Accordingly, the rod 27a of the clutch cylinder 27 to which the air is supplied is protruded, and the traveling clutch is in a connected state.

Here, when the switches 11a and 12a are pressed when operating the main transmission lever 11 or the shuttle lever 12, the relay 61 is excited and switched, and the clutch valve 51 takes the position shown in FIG. Therefore, the rod 27a is retracted by the air from the air tank T,
The arm member 26 shown in FIG. 6 rotates clockwise to disengage the traveling clutch. As a result, the operator can operate the main shift lever 11 or the shuttle lever 12 to an arbitrary shift position. And lever 11,
When the switches 11a and 12a are turned off after operating the clutch 12, the clutch valve 51 is switched again (FIG. 10).
), The rod 27a is extended and the traveling clutch is connected (see FIG. 11).

When the traveling clutch is engaged, the piston 27b is first detected by the cylinder switch 29b, and then detected by the cylinder switch 29a.
7b, the half-clutch valve 55
Is switched, and the air from the clutch cylinder 27 is discharged through the silencer 6 with the throttle valve. Therefore, the moving speed of the piston 27b becomes slow, and the traveling clutch is slowly and slowly engaged. The cylinder switch 29b is turned off immediately after the passage of the piston 27b. However, since the relay 65 is energized and acts as a kind of self-holding circuit, the half-clutch valve 5
5 is maintained in the switched state. When the other cylinder switch 29a detects the piston 27b and turns on, the relay 62 is switched, and as a result, the current supply to the half-clutch valve 55 is cut off and switched. Therefore, air from the clutch cylinder 27 is sent to the clutch valve 51 and discharged from the silencer 52 without passing through the throttle valve. As a result, the moving speed of the piston 27b increases, and the traveling clutch is connected. In other words, the traveling clutch is smoothly engaged by the half-clutch operation, similarly to the case where the traveling clutch is normally performed manually.

FIG. 9 shows a brake valve 50a.
Are shown together with the state in which the clutch valve 51 is switched in accordance with the operation of the switches 11a and 12a.
The operation of b is performed independently of the operation of the clutch valve 51. When the switches 11a, 12a and 15 are off, the cylinders 27, 37 and 47 are connected to the rod 27.
While the rods 27a, 37a, 47a are held in the extended state, the rods 27a, 37a, 47a have the members 28, 38,
48, the pedals 20, 3
Operation of the 0,40 is not impeded.

Next, the effect of this embodiment will be described.

As described above, in this embodiment, since the brakes of the left and right rear wheels 3a and 3b are operated by air, unlike the case of being operated by hydraulic pressure, power steering and the like are performed. There is no danger of insufficient hydraulic pressure to operate the hydraulic equipment. Also, even when retrofitting the quick-turn device according to the present embodiment, unlike the case where piping for supplying oil is performed, piping work is facilitated without fear of oil leakage or the like. Further, when the turning angle of the front wheel 2a reaches a predetermined angle, the turning angle sensor 7 disposed on the front wheel 2a detects the turning angle and the brake is automatically operated, so that the brake pedal is operated with the foot. There is no need, making driving easier.

On the other hand, the left and right brake valves 50a, 5
The throttle valves 53, 53 are interposed between the cylinders 0, 0b and the brake cylinders 37, 47, and the air supply to these cylinders 37, 47 is performed gently. No worries. Further, a high-speed switch 63 that is turned off during high-speed running is provided in the transmission 4, and the cylinders 37, 47 during high-speed running are provided.
As a result, there is no need to worry about quick brake operation during high-speed turning.

On the other hand, a radiator 8 is disposed between the compressor 9 and the valve assembly A and the engine E, and the heat of the engine E is cut off by the radiator 8. Therefore, the compressor 9 and the like are hardly affected by the heat of the engine E. Furthermore, since the compressor 9 and the valve assembly A are arranged in the front part in the hood 5a, and the obstacles such as the radiator 8 are not arranged in front of them, the compressor 9 and the valve assembly A are easily cooled by the wind of the cooling fan or the like. Troubles are reduced, and operation can always be performed efficiently.

The battery B in the front of the hood 5a
Usually, the side space is empty, and by arranging the compressor 9 and the valve assembly A in such a place, the battery B is used to secure a dedicated space for arranging the compressor 9 and the valve assembly A. And the position of the radiator 8 does not need to be changed. Therefore, these air devices can be installed at low cost,
In addition, pneumatic equipment can be installed later on tractors already on the market. Further, by arranging the compressor 9 and the valve assembly A centrally in the front portion of the bonnet 5a, repair and inspection become easy. Further, since the compressor 9 and the valve assembly A are arranged inside the bonnet 5a, the appearance of the tractor is improved, and these air devices do not hinder other operations. In addition, other air equipment (for example, an air supply, a cardboard stapler) using the compressor 9 or the like can be mounted, and it becomes easy to increase the equipment of the tractor.

Further, since the air tank T is mounted inside the step F below the floor 5b, the appearance is improved, and the air tank T is protected by the step F and is not easily damaged. The engagement between the cylinders 27, 37, 47 and the arm members 26, 36, 46 is made by the long holes 28a, 38a, 4
Since the operation is performed through the members 28, 38, and 48 having 8a, the operation of each of the pedals 20, 30, and 40 has priority and is safe. Further, by providing the PTO lever on the right side, the PTO shift can be performed without using a foot.

[0034]

[Effect of the invention] As described above, according to the invention,
Since the brakes for the left and right rear wheels are actuated by air, unlike when actuated by hydraulic pressure, there is no danger of insufficient hydraulic pressure for operating hydraulic equipment such as power steering. Also, when the quick-turn device according to the present invention is retrofitted, the piping work is facilitated without fear of oil leakage or the like, unlike the case where piping for supplying oil is performed. Furthermore, when the turning angle of the front wheel reaches a predetermined angle,
Since the turning angle detecting means provided on the front wheel detects the turning angle and the brake is automatically operated, there is no need to operate the brake pedal with the foot, and driving becomes easier. Also,
Switching valve and compressor, sandwiching radiator
By arranging it in front of the engine,
Heat is cut off by the radiator and
The effect of heat of the engine can be prevented. Change
The switching valve and compressor are located in the front of the bonnet.
And obstacles such as radiators are placed in front of it.
The switching valve and compressor are not
Because it is easily cooled by wind from a cooling fan,
Troubles can be avoided. Furthermore, general
There is a battery in the front of the hood,
The space beside the battery is usually free.
Switching valve and compressor
By doing so, effective use of space can be achieved
You.

On the other hand, since a throttle valve is interposed between the switching valve and the brake actuator to supply air to the actuator gently, there is no fear that the brake is suddenly operated and the brake is locked. . Also,
Since a switch that is turned off during high-speed running is provided in the transmission to stop the operation of the brake by the actuator during high-speed running, there is no worry about quick brake operation during high-speed turning.

[Brief description of the drawings]

FIG. 1 is a side view showing the entire structure of a tractor.

FIG. 2 is a plan view showing the entire structure of the tractor.

FIG. 3 is a plan view showing an arrangement of a compressor and the like inside the hood.

FIG. 4 is a diagram showing a configuration of a valve assembly and other pneumatic devices.

FIG. 5 is a view for explaining a mounting position of the air tank, and is a view as seen from an arrow D in FIG. 1;

FIG. 6 is a diagram for explaining a link mechanism of a traveling clutch and a brake.

FIG. 7 is an electric circuit diagram for explaining an electric circuit used in this embodiment.

FIG. 8 is a schematic diagram showing a non-operating state of a brake and a traveling clutch.

FIG. 9 is a schematic diagram showing a state in which a brake and a traveling clutch on one side are operating.

FIG. 10 is a schematic diagram showing a state immediately before a traveling clutch is connected.

FIG. 11 is a schematic diagram showing a state in which the traveling clutch is connected by a so-called half clutch.

FIG. 12 is a side view showing the structure of a tractor as a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Moving agricultural machine (tractor) 2a, 2b Front wheel 3a, 3b Rear wheel 4 Transmission (Transmission) 5 Traveling machine body 5a Bonnet 5b Floor 7 Cutting angle detection means (Cutting angle sensor) 8 Radiator 9 Compressor 11 Main transmission lever 11a Switch 12 Shuttle Lever 12a Switch 13 Main switch 15 Brake switch 27 Clutch cylinder 29a, 29b Cylinder switch 30 Brake pedal 47 Brake actuator (Brake cylinder) 40 Brake pedal 47 Brake actuator (Brake cylinder) 50a, 50b Switching valve (Brake cylinder) Valve) 53 Throttle valve 51 Clutch valve 55 Half-clutch valve 57 Exhaust path with throttle valve 63 Switch (high-speed switch) A Valve assembly B Battery E Engine T Air tank

Claims (2)

(57) [Scope of request for utility model registration] An engine and a radiator in a hood
And drive the running wheels by the driving force of the engine.
In addition, in a mobile agricultural machine having a pair of left and right brake pedals for braking each of the right and left rear wheels, a turning angle detecting means disposed on a front wheel to detect a turning angle of the front wheel, and a signal from the turning angle detecting means. A switching valve that is switched by the compressor, a compressor that supplies air to the switching valve, and a pair of brake actuators that are driven by air supplied through the switching valve. when a predetermined angle, one of the actuators is driven by rotation inside the brake of said pair of actuators for braking it to operate
And, further, the switching valve and the compressor, said Raj
A quick-turn device for a mobile agricultural machine, wherein the quick-turn device is disposed in front of the engine with the eta interposed therebetween . 2. A transmission device in which a throttle valve is interposed between the switching valve and the brake actuator so as to supply air to the actuator gently and to turn off a switch which is turned off during high-speed running. 2. The quick-turn device for a mobile agricultural machine according to claim 1, wherein the brake is stopped by the actuator during high-speed running.