JPH10264784A - Braking device in working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent adhesion of mud and water to a contact and prevent wrong recognition of switch on and off by enclosing a switch in a switch case provided at a brake pedal so as to form complete waterproofed, mud-proofed structure, and not exposing wiring from the switch to a meter panel to the outside. SOLUTION: A switch case is provided between a pedal arm 12b and a pedal plate, and a switch 25 is fixed to a switch plate, fixed to the upper face of the switch case, by a machine screw 26. One end of the switch 25 detects the rotating angle of a connecting fitting through a spring energized toward a cam face 30a, and the other end transmits detected information to a monitor lamp of an operating part through a lead wire 35 passing in an upper hole of the switch case and a hollow pipe of a brake pedal 12a. Since the switch 25 is in a water-proofed and mud-proofed switch case, water and mud do not adhere to a contact, and wiring from a right brake pedal 12a is not exposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle having a brake pedal for independently braking left and right drive wheels and braking the drive wheels by connecting the left and right brake pedals alone or in combination. The present invention relates to a brake device in a work vehicle that is detected by a switch and recognized by a driver.

[0002]

2. Description of the Related Art Conventionally, as is known from Japanese Utility Model Publication No. 51-26814, a tractor having two independent brake pedals for braking the left and right drive wheels is provided.
The pivoting piece is pivotally supported on one brake pedal to be freely engageable with the locking piece of the brake pedal on the other side, and the presence or absence of the engagement is turned by a push button switch attached to the locking piece. The push button switch is detected by being pushed by one side, and is recognized by the driver by turning on a lamp or the like, or, as is known from Japanese Utility Model Publication No. 59-9959, the upper part of the push button switch is covered with a dustproof cover. A brake pedal device for rotating a rotating piece from below and engaging the same is already known.

[0003]

Problems to be Solved by the Invention
No. 6814, the contact between the locking piece and the push button switch has no protection against mud or water,
The one known from Japanese Utility Model Publication No. 59-9959 is also covered with a dustproof cover only above the push button switch and opened below, so that neither of them has a completely waterproof and mudproof structure. Water was attached and the pilot's perception was sometimes uncertain.

In both cases, it is unclear that the presence or absence of engagement of the rotating piece is displayed as switch off when engaged and switch on when not engaged.

Therefore, according to the present invention, when the connection fitting provided on the brake pedal on one side is connected to the connection fitting receiving part of the brake pedal on the other side, and the presence or absence of the connection is detected by the switch, the switch is set to the above-mentioned state. It is housed in a switch case provided on the brake pedal to make it completely waterproof and mudproof, so that mud and water do not adhere to the contacts, switch off when connected and switch on when not connected, erroneous recognition by the pilot The purpose is to prevent.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has brake pedals (12) and (12a) for independently braking left and right drive wheels.
A connecting bracket (28) is rotatably provided on one of the brake pedals (12a), and is freely connectable to a connecting bracket (36) of the other brake pedal (12). Control panel (7)
In the work vehicle (1) displayed on the
Set the switch (25) to the brake pedal (12a).
The switch (25) is housed in a switch case (12c) provided with a completely waterproof and mudproof structure, and the wiring (35) from the switch (25) to the meter panel (7) is not exposed to the outside, and the connection is made. The above-mentioned problem has been solved by displaying the presence or absence of the connection of the metal fitting (28) as switch-off at the time of connection and switch-on at the time of non-connection.

(Operation) With the above configuration, the working vehicle (1)
When working at a low speed in the workplace, the left and right brake pedals (12) and (12a) are disconnected from each other, and the brake pedal (12) or (12a) on one side is depressed during turning to turn the work vehicle (1). A switch (25) housed in the switch case (12c) is turned on and displayed on the meter panel (7) of the control unit, and the left and right brakes are promoted. Pedal (12)
And (12a) recognize and warn the pilot that they operate independently.

On the other hand, when the work vehicle (1) travels on a road or the like at a high speed, the connecting bracket (28) rotatably provided on one of the brake pedals (12a) is turned to rotate on the other side. When the switch (25) is connected to the connection bracket (36) of the brake pedal (12), the switch (25) housed in the switch case (12c) is operated by an interlocking member provided on the rotating shaft (30) of the connection bracket (28). ) Is turned off and is not displayed on the meter panel (7) of the control unit, and the left and right brake pedals (12)
And (12a) are activated by the operator.

The switch (25) is housed in a switch case (12c) which is completely waterproof and mudproof so that water and mud do not adhere to the contacts and the switch (25) is connected to the meter panel (12) from the brake pedal (12a). The wiring 35 up to 7) also has no portion exposed to the outside, so that it can be reliably displayed on the meter panel (7).

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.

FIG. 1 is a plan view of a control section of the tractor 1. The operator sits on the seat 2 at the rear center, sets the operation levers 3 and 3a disposed on the left and right to predetermined positions, and moves straight or turns while steering the steering handle 4 at the upper front.

At this time, an operation panel 5 shown in FIG. 2 is provided immediately below the steering handle 4, and the operation panel 5 includes a meter panel 6 in which meters for displaying a running state are collected, and a driving state of the tractor 1 is indicated by a lamp. And the like, and a number of switches 8 for controlling operating conditions are provided.
The driver can be recognized while sitting on the seat 2 and operating the steering handle 4.

The left and right steps 10 and 10a on which the operator places his / her feet are provided with a clutch pedal 11, left and right brake pedals 12 and 12a and an accelerator pedal 14, respectively, which are operated by the feet. I have.

The brake pedals 12 and 12 of the tractor 1
The left side a is arranged in a row independently from the right side of the step 10a through the step 10a from below the right side step 10a, and has a structure in which the left and right drive wheels are independently braked.

That is, as shown in FIGS. 3 and 4, the left and right brake pedals 12 and 12a each have a separate rotation support shaft, and in particular, the left rotation support shaft crosses the main body of the tractor 1. To the lower side of the step 10 from the left side, and symmetrically across the body of the tractor 1 from the position to the rear through the left and right links 16 and the brake rod 17 and to the brake cam lever 18 to rotate the brake cam lever 18. And brake.

The above-described braking operation is useful when the tractor 1 performs a low-speed operation in a work place such as a field, but it is extremely dangerous that the one-side brake is braked alone during high-speed operation during road running or transporting operation. It is.

The present invention relates to a braking method in which the left and right brake pedals 12 and 12a of the tractor 1 having the above-mentioned structure are connected to enable simultaneous braking operation.

The main body of the right brake pedal 12a is a pedal arm 1 formed of a hollow pipe and curved in a side view.
In the present invention, a box-shaped switch case 12c integral with the pedal arm 12b is interposed between the pedal arm 12b and the pedal plate 20. And the front surface of the switch case 12c are fixed by screws 21.

As shown in FIG. 5, the switch case 12c opens to the pedal plate 20 side, and
b, and the switch plate 22
Are fixed by screws 23, and a switch 25 is fixed to the switch plate 22 by screws 26.

A cam shaft 30 serving as a rotation center of a connecting fitting 28 connected to the left brake pedal 12 penetrates a boss 12d at the center of the upper surface of the switch case 12c, and a nut 31 sandwiches the connecting fitting 28 therebetween. Switch case 1
2c.

The upper part of the camshaft 30 has two chamfers and two connecting brackets 2.
8 and is rotatably rotated integrally with the connection fitting 28,
The lower portion is formed in an eccentric cam shape, and the cam surface 30a projects from the switch 25 and is in contact with a spring 32 biased toward the cam surface 30a.

The boss 12d penetrating portion of the camshaft 30 is sealed by an O-ring 33 to prevent intrusion of muddy water from the bearing into the switch case 12c.

As shown in FIGS. 5 and 6, one end of the switch 25 detects the rotation angle of the connection fitting 28 by a spring 32 urged toward the cam surface 30a, and the other end detects the detected information. The monitor lamp 7 of the control unit is connected to a lead wire 35 passing through the upper hole 12e of the switch case 12c and the hollow pipe of the brake pedal 12a.
Send to

The main body of the left brake pedal 12 is also formed of a hollow pipe and has a curved pedal arm 12 in a side view.
f and the pedal plate 20 at the tip,
At a position corresponding to the rotation of the connection bracket 28, a connection bracket 36 is integrally welded to the main body, and the connection bracket 28 is rotated and received by the connection bracket 36, and the left and right brake pedals 12 are moved. And 12a are connected and work together,
The switch 25 turns off the monitor lamp 7 and the connection fitting 2
The switch 25 is configured so that the monitor lamp 7 is turned on when the left and right brake pedals 12 and 12a are disengaged from the connection bracket receiving member 36 by being rotated in the reverse direction and are independently operated. I have.

The left and right brake pedals 12 and 12
As shown in FIGS. 7 and 8, the surface of the pedal plate 20 at the tip is non-slip, and the flanged rubber cover 3
7 prevents the intrusion of muddy water from the surface into the switch case 12c.

Next, the operation of this embodiment will be described.

With the above structure, when the tractor 1 works at a low speed in a work place such as a field, the left and right brake pedals 12 are used.
When the brake pedal 12 or 12a on one side is depressed at the time of turning in a non-coupled state to help reduce the turning radius of the tractor 1 on that side, the switch 25 accommodated in the switch case 12c is turned on. When it is turned on, it is displayed on the monitor lamp 7 of the control unit to recognize and warn the driver that the left and right brake pedals 12 and 12a operate independently.

On the other hand, when the tractor 1 travels on a road or the like at a high speed, the connecting fitting 28 rotatably provided on the right brake pedal 12a is rotated to connect the connecting fitting receiving part of the left brake pedal 12. 36, the connecting fitting 28
The operation of the spring 32 that urges against the cam surface 30a of the cam shaft 30, which is the rotation shaft of
The switch 25 housed in 2c is turned off and is not displayed on the monitor lamp 7 of the control unit, and the driver is notified that the left and right brake pedals 12 and 12a are simultaneously operated.

The switch 25 is housed in a completely waterproof and mudproof switch case 12c, so that water and mud do not adhere to the contacts, and the right brake pedal 1
The wiring from 2a to the operation panel 5 also has no portion exposed to the outside, so that it can be reliably displayed on the monitor lamp 7.

As shown in FIGS. 9 and 10, a switch case 41 is provided below the right brake pedal 12a, a switch 42 is fixed to the pedal arm 12b side of the switch case 41, and a camshaft 43 is provided forward. A connection fitting 44 fixed and formed in a cam shape is rotatably supported on the cam shaft 43, and the switch 4 is turned on only when the connection fitting 44 is rotated and engaged with the connection fitting hook 45 of the left brake pedal 12.
2. The structure of the conventional brake pedal is significantly changed from the conventional brake pedal structure by notifying the operator of the operation of the left and right brake pedals 12 and 12a at the same time without displaying the monitor lamp 7 on the control unit because the 2 is turned off. Thus, the object of the present invention can be achieved.

Also in this case, as shown in FIG. 10, the switch 42 is completely built in the bulging portion at the tip of the pedal arm 12b, so that water and mud do not adhere to the switch 42, and Since the wiring from the brake pedal 12a to the operation panel 5 has no portion exposed to the outside, it can be reliably displayed on the monitor lamp 7.

[0033]

According to the present invention, a brake pedal for independently operating the left and right drive wheels is provided, and one of the brake pedals is provided with a rotatable connecting bracket, and the other of the brake pedals is provided with a connecting bracket receiver. In a work vehicle, the presence or absence of the connection is detected by a switch, displayed on a meter panel of a control unit and recognized by a driver, the switch is stored in a switch case provided on the brake pedal, With a waterproof and mudproof structure, the wiring from the switch to the meter panel is configured not to be exposed to the outside, and the presence or absence of connection of the connection metal fittings is switched off when connected and displayed as switch on when not connected. As a result, the switch has a waterproof / mudproof structure and can prevent erroneous operation.

[Brief description of the drawings]

FIG. 1 is a plan view of a control section of a tractor.

FIG. 2 is a plan view of an operation panel.

FIG. 3 is a side view of a brake system.

FIG. 4 is a rear view of the left and right brake pedals.

FIG. 5 is a plan view of a state where left and right brake pedals are connected.

FIG. 6 is a rear view of the left and right brake pedals connected.

FIG. 7 is a plan view of a left brake pedal.

FIG. 8 is a plan view of the right brake pedal.

FIG. 9 is a plan view of a left and right brake pedal according to another embodiment.

FIG. 10 is a sectional view taken along the line AA of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor 5 Operation panel 7 Monitor lamp 10 Step 12 Brake pedal 12c Switch case 20 Pedal plate 25 Switch 28 Connecting bracket 30 Cam shaft 36 Connecting bracket receiver 42 Switch 43 Cam shaft 44 Connecting bracket

Claims (2)

[Claims] 1. A brake pedal for independently operating the left and right drive wheels for braking operation, a connecting bracket is provided rotatably on one of the brake pedals, and is freely connectable to a connecting bracket receiver of the other brake pedal. In a work vehicle, the presence or absence of the connection is detected by a switch and displayed on a meter panel of a control unit and recognized by a driver. The switch is housed in a switch case provided on the brake pedal, and a complete waterproof and mudproof structure is provided. A brake device for a working vehicle, wherein a wiring from the switch to the meter panel is not exposed to the outside. 2. The brake device for a work vehicle according to claim 1, wherein the presence or absence of connection of the connection fitting is displayed as a switch off when connected and as a switch on when not connected.