JP2912804B2 - Work vehicle clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a clutch device for a working vehicle which is manually operated and disconnected.

[0002]

2. Description of the Related Art Conventionally, various clutch devices driven by air have been proposed.

FIG. 12 shows an example disclosed in Japanese Patent Application Laid-Open No. 2-272609.
Are front wheels 102a, 102b and rear wheels 103a, 103
and a traveling body 105 supported by the b. The clutch pedal 120 is configured to be operated by air, and an air device such as a compressor 109 that generates air pressure is attached to a front end of the traveling body 105.

[0004]

In the above-mentioned conventional example, since the pneumatic device such as the compressor 109 is attached to the outside (front end) of the traveling body 105, not only the appearance is poor, but also the total length of the tractor 100 is reduced. There was a problem of becoming long. Further, there is a problem that the air device protruding from the front end of the traveling body 105 obstructs other operations.

Accordingly, an object of the present invention is to provide a clutch device for a working vehicle in which the appearance is improved by arranging an air device inside a hood or the like.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a shift lever (11, 12) for performing a shift operation of a transmission (4);
Actuator (2)
7), a compressor connected sequentially to an actuator for the clutch (9), a pneumatic equipment consisting of air tank (T), and a first switching valve (51), said variable
Can be operated with fingers attached to speed levers (11, 12)
Switches (11a, 12a).
(1a) based on the operation of the first switch (11a, 12a).
The air from the air tank (T) is selectively switched by switching a valve (51).
7) to make the clutch intermittent and
First switching valve (51) and the compressor
(9) is replaced with a battery arranged in the hood (5a).
(B) It is characterized by being arranged on the side .

[0007]

[0008]

According to the above construction, the shift levers (11, 12)
It switches capable of operating in mounted finger in (11a, 1
When the second switching valve (51) is turned on, the first switching valve (51) is appropriately switched to operate the clutch actuator (27).
Is supplied with air from an air tank (T). Then, the actuator supplied with air can operate the shift levers (11, 12) to disengage the clutch, thereby performing a shift. Here, the first switching valve (5
1) and air appliance of the compressor (9) or the like, on the side of the bonnet (battery disposed within 5a) (B)
By arranging, the empty space on both the left and right sides of the battery (B)
Use this space because the space is originally empty
This effectively utilizes the empty space, improves the appearance of the working vehicle, and does not hinder the pneumatic equipment from performing other work.

[0009]

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

[0011]

Embodiments 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 working vehicle has front wheels 2a and 2b and rear wheels 3a and 3b.
And a traveling body 5 supported by the
A transmission (transmission) 4 including a main clutch (not shown) is disposed below the lower part. On the other hand, a turning angle sensor 7 having a pair of front and rear detecting portions is attached to the left front wheel 2a as shown in detail in FIG. 2, and the knuckle arm is fully steered in either the left or right direction. The turning angle sensor 7 detects that the left front wheel 2a is at the maximum turning angle (for example, about 40 degrees) based on the fact that 6 contacts one of the detection units. 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 is arranged in a hood 5a in front of the traveling machine body 5 (the left side in FIG. 1; the same applies hereinafter), and a radiator 8 is arranged in front of the engine E. . Further, the front radiator 8 in the hood 5a, as shown in detail in FIG. 3, the battery B is arranged, towards the left and right side of the battery B
This is an empty space, and in this embodiment, the battery B
On the left side is a compressor 9 driven by battery power
Are arranged, and a valve assembly A is arranged on the right side of the battery B. As shown in detail in FIG. 4, the valve assembly A includes a switching valve (a right brake valve 50a, a left brake valve 50b, and a clutch valve 51) for switching an air path from the compressor 9, and air such as a filter regulator R. The device is configured to be attached to a 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 in a space below the floor 5b, and is configured to supply air to the clutch cylinder (clutch actuator) 27 and the brake cylinders 37, 47 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. A main shift lever (shift lever) 11 and a shuttle lever (shift lever) 12 are provided upright on the left side of the driver's seat 10. It is configured to be able to change gears. These levers 11 and 12
Push-type switch 1 that can be operated with fingers
1a and 12a are attached, respectively, and when these switches 11a and 12a are pressed, the clutch valve
51 is switched so that the main clutch is disengaged by the air from the compressor 9 to enable gear shifting. Further, a main switch 13 and a brake switch 15 are arranged at the lower right of the driver's seat 10.
Relays 60, 61, 62, and 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, a clutch pedal 20 is swingably supported below the steering wheel S, and a clutch rod 21 and a clutch link 22 are provided at ends of the pedal 20 as shown in detail in FIG. The clutch rod 23 is connected in order to operate the main clutch (not shown) by operating the clutch arm 25. In addition, the chassis frame 5 arranged below the floor 5b
A clutch cylinder (clutch actuator) 27 is swingably supported by c.
A member 28 having a long hole 28a is attached to the distal end of a. On the other hand, an arm member 26 is fixed to the clutch link 22 so as to rotate integrally, and a pin 26a is protruded from an end of the arm member 26. That is, the clutch cylinder 27 is connected to the clutch arm 25 via the arm member 26, the clutch link 22 and the clutch rod 23. Therefore, when depressing the clutch pedal 20, the pin 26
a moves in the elongated hole 28a, the rotation of the arm member 26 in the clockwise direction is not hindered.
Is operated smoothly. On the other hand, when the rod 26a is contracted by operating the clutch cylinder 27, the arm member 26 is rotated clockwise, and the clutch arm 25 is also operated. It has become. Cylinder switches (detection means) 29a, 29b are attached to the clutch cylinder 27, and the operation state of the clutch is detected based on the detection of the position of the sliding piston 27b. Details will be described later). In addition, this cylinder switch 29a,
Reference numeral 29b is movably attached, and is configured so that the position thereof is appropriately changed so that connection of a main clutch described later is smoothly performed.

Left and right brake pedals 30, 40 are disposed on both sides of the clutch pedal 20 with the clutch pedal 20 interposed therebetween (see FIG. 2). And the rear wheels 3a, 3b
Is operated by depressing these brake pedals 30, 40, and the above-described clutch pedal 2
It is configured to operate by air as well as 0. In other words, as shown in detail in FIG.
1, 41, brake links 32, 42 and brake rods 33, 43 are connected in order. Also, floor 5b
Brake cylinders 37 and 47 are swingably supported on the lower side, and members 38 and 48 having long holes 38a and 48a are attached to the distal ends of the rods 37a and 47a. On the other hand, arm members 36 and 46 are fixed to the brake links 32 and 42 so as to rotate integrally, and pins 3 are attached to the ends of the arm members 36 and 46.
6a and 46a are protruded. Therefore, when the brake pedals 30, 40 are depressed, the pins 36a, 4
Since 6a moves in the slots 38a, 48a, the rotation of the arm members 36, 46 in the clockwise direction is not hindered, and the brake is smoothly operated. The brake cylinders 37 and 47 are connected to the above-described turning angle sensor 7.
The quick turn device is operated based on the detection signal from the device.

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.
Each air passage has a right brake valve 50a,
Left brake valve 50b and clutch valve (first
Switching valve) 51 is interposed to selectively supply air from the air tank T to the clutch cylinder 27 to disconnect or connect the main clutch, or to switch the brake cylinder 37, 47
It is configured to actuate the brake via the. Silencers 52, 52, 52 are attached to these valves 50a, 50b, 51, respectively, and the left and right brake valves 50a, 50b and the brake cylinder 3 are provided.
Throttle valves 53 and 53 are interposed between the throttle valves 7 and 47. Further, the air passage downstream of the clutch valve 51 is branched into two and communicated with the clutch cylinder 27, and a half-clutch valve (second switching valve) 55 is interposed in one of the air passages. ing. The half clutch valve 55 has a silencer 56 with a throttle valve.
The exhaust path 57 provided with a throttle valve is provided continuously.

On the other hand, the electric circuit of this embodiment is configured as shown in FIG. 7. 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 main clutch is connected.

Here, when the main 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 quick turn is enabled by turning on the brake switch 15, 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.

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

[0024] Now, Sui <br/> pitch 11a that may operate the main clutch with fingers, when actuated by 12a is leaving the main switch 13 is turned on in advance. Then relay 6
0 is excited to drive the compressor 9, and the air from the compressor 9 is sent to the clutch valve 51 via the air tank T and the filter regulator R. However, when the switches 11a 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. Therefore, the rod 27a of the clutch cylinder 27 to which the air is supplied is protruded, and the main 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, and the main clutch is disengaged. As a result, the operator can operate the main shift lever 11 or the shuttle lever 12 to an arbitrary shift position. And the levers 11 and 1
When the switches 11a and 12a are turned off after the operation of the clutch 2, the clutch valve 51 is switched again (see FIG. 10), the rod 27a is extended, and the main clutch is connected (see FIG. 11).

When the main clutch is engaged, the piston 27b is first detected by the cylinder switch 29b, and then detected by the cylinder switch 29a.
When b is detected and turned on, 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. Accordingly, the moving speed of the piston 27b becomes slow, and the main 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 excited and acts as a kind of self-holding circuit, the half-clutch valve 55
Are 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 main clutch is connected. In other words, the main clutch is smoothly connected by the half-clutch operation, as in the case of the manual operation.

Next, the operation when the brake switch 15 is turned on to drive the quick-turn device will be described.

When the main switch 13 and the brake switch 15 are turned on, the compressor 9 is driven in the same manner as described above, and the air from the compressor 9 flows through the air tank T and the filter regulator R to the brake valves 50a, 50a. 50b. When the tractor 1 is operated in this state and the steering wheel S is fully turned in one of the left and right directions, the knuckle arm 6 comes into contact and the turning angle sensor 7 is turned on. Then, one of the brake valves 50a and 50b is driven, the brake of the rear wheel on the inside of rotation is operated, and the traveling machine body 5 turns with a 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 double speed by the action of the differential gear (not shown), and as a result, the traveling machine body 5 turns with the minimum radius.

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, the main clutch is connected to the push-type switches 11a, 11
2a, it is not necessary to depress the clutch pedal 20 with the foot, so that the shift operation can be easily performed. Further, since the air devices such as the compressor 9 and the air tank T are arranged in the hood 5a or below the floor 5b, the appearance is improved, and these air devices do not hinder other operations. Further, since the mounting position of the air tank T is inside the step F, the air tank T
Are protected by step F and are not easily damaged. In addition, other air equipment (for example,
Inflator, cardboard stapler)
Equipment can be increased.

On the other hand, when the clutch is engaged, the air in the clutch cylinder 27 is discharged through the exhaust path 57 with a throttle valve, so that the clutch cylinder 27 operates slowly. Therefore, the main clutch is connected at a low speed, and smooth shifting can be performed despite the automatic clutch connection.

Even when the main clutch is operated by pressing the switches 11a and 12a, the clutch pedal 20 is driven via the clutch rod, so that the clutch pedal 20 functions as an indicator and the operator can easily operate the main clutch. It can be recognized and there is no fear of erroneous operation. further,
By providing the PTO lever on the right side, the PTO shift can be performed without using a foot.

On the other hand, since the space on both sides of the battery B is generally empty in a tractor where no air equipment is arranged, it is necessary to secure a dedicated space for arranging the compressor 9 and the valve assembly A. There is no. Therefore, the pneumatic device can be retrofitted to a tractor that has already been sold, so that the main clutch can be manually operated and a quick turn can be performed. In addition, it becomes possible to make these equipment optional equipment. Further, the cylinders 27, 37, 47 and the arm members 26, 3
6 and 46 are engaged through the members 28, 38 and 48 having the long holes 28a, 38a and 48a.
The operation of each of the pedals 20, 30, 40 has priority and is safe.

[0035]

As described above, according to the present invention,
The clutch can be disengaged simply by turning on a switch that is attached to the shift lever and can be operated with fingers, and there is no need to depress the clutch pedal with the foot, so that shifting can be performed easily. In addition, pneumatic devices such as a first switching valve and a compressor are connected to a battery disposed in a hood.
Since it is located on the side, free space in the hood is effective
While being able to be used, the appearance of the work vehicle is improved, and these pneumatic devices do not interfere with other work. Further, other air equipment (for example, an air supply, a cardboard stapler) using the compressor or the like can be mounted, and the equipment of the working vehicle increases.

[0036]

[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 an air device.

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 main 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 main clutch.

FIG. 9 is a schematic view showing a state where one brake and a main clutch are operated.

FIG. 10 is a schematic diagram showing a state immediately before connecting a main clutch.

FIG. 11 is a schematic diagram showing a state where the main 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 Working vehicle (tractor) 2a, 2b Front wheel 3a, 3b Rear wheel 4 Transmission (transmission) 5 Traveling body 5a Bonnet 5b Floor 7 Cutting angle sensor 9 Compressor (pneumatic device) 11 Shift lever (main shift lever) 11a Switch 12 Shift Lever (shuttle lever) 12a Switch 27 Clutch actuator (clutch cylinder) 29a, 29b Detecting means (cylinder switch) 51 First switching valve (clutch valve) 55 Second switching valve (half-clutch valve) 57 Throttle Exhaust path with valve T Air tank (air equipment)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60K 23/02 F16D 25/08 F16D 25/14 B62D 49/00

Claims (1)

(57) [Claims] 1. A shift lever for shifting a transmission, a clutch actuator connected to a clutch of the transmission, a compressor, an air tank, and a first switch connected to the clutch actuator in order. An air device consisting of a valve, and a switch attached to the shift lever and operable by finger.
And the first switching valve based on the operation of the switch.
And selectively supplied to the said actuator clutch air from the air tank by switching the enable interrupt the clutch
And the first switching valve and the compressor
A clutch device for a working vehicle, wherein the clutch device is arranged on a side of a battery arranged in a net .