JPH0711009Y2 - Side brake device for work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a side brake device in a traveling machine body for work such as an agricultural tractor.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of working vehicle, since it is necessary to separately brake the left and right traveling wheels, a pair of left and right side brake pedals are provided, and when traveling in the field. Allows both side brake pedals to be selected separately for depressing operation, while both side brake pedals are connected for simultaneous depressing when traveling on the road. In the past, however, switching between the separate depression and the simultaneous depression of the side brake pedals was done by switching the connecting plates provided on the pedals, so a pair of left and right side brake pedals is inevitably necessary. For this reason, the step portion is narrowed and the habitability of the foot space is impaired, and it is necessary to look at the feet to check if the left and right side brake pedals are pressed correctly. There is a problem that a cautionary state occurs.

Therefore, in a four-wheel drive vehicle, when the vehicle is traveling (turning), the turning front wheel on the outer wheel side is rotated at a higher speed than the front wheel on the inner wheel side. It is also possible to discontinue the system (for example, to provide a braking system before the input of the defroster mechanism provided in the power transmission system to the front-wheel drive output shaft) to simultaneously brake, but in a two-wheel drive vehicle This was not possible, and the choice of side-brake systems was inevitable.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and was devised with the object of providing a side brake device for a working traveling vehicle body capable of eliminating these drawbacks. In the working traveling machine body, a steering wheel for steering the vehicle body to the left and right, left and right side brakes for respectively braking the left and right traveling wheels, and left and right flasher means for giving a direction instruction are provided. A single brake pedal is used for braking the brakes, and between the brake pedal and each side brake, the left and right side brakes are selectively braked simultaneously or simultaneously by pressing the brake pedal. A brake switching means capable of switching is provided, and the steering wheel, the brake switching means and the left side are provided. Between the right flasher means, there is a first switching switch means that switches according to the steering direction of the steering wheel, and it is possible to switch to a field running state or a road running state.When switching to the road running state, the brake is switched. The means are maintained in the simultaneous braking state regardless of the switching of the first switching switch means, and the left and right flasher means are connected so that the switching operation of the switched side of the first switching switch means is performed to switch to the field running state. Occasionally, the brake switching means is selectively braked on the side on which the first switching switch means is switched, and the left and right flasher means are connected so as to be in an inoperative state regardless of the switching of the first switching switch means. And is provided.

According to this configuration, the present invention provides separate braking of the side brakes and simultaneous braking with a single brake pedal,
The steering wheel and the second switching switch for switching between the field and the road can be used separately.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of an agricultural tractor, and a single brake pedal 3 is arranged in front of and below a driver's seat 2 of the traveling machine body 1. The brake pedal 3 includes a main cylinder 4 Are interlocked and connected, and when the brake pedal 3 is stepped on, hydraulic oil is sent out toward the switching valve 5 side. The switching valve 5 corresponds to the brake switching means of the present invention, but in the neutral state, the side brakes 7 provided on the left and right traveling wheels 6 respectively.
Is configured to send the hydraulic oil to the brakes for braking, whereby the left and right side brakes 7 can be simultaneously braked when traveling on the road or the like. As will be described later, the switching valve 5 is provided with solenoids 5L and 5R for turning left and right, and by operating these solenoids 5L and 5R for turning left and right, the corresponding side valves are The hydraulic oil is pumped to the brake 7 side.

On the other hand, 8 is a steering wheel, and the steering wheel 8 is provided with a first switching switch 9 for detecting and changing the steering direction. That is, the first switching switch 9 closes the contact circuit on the A side when the switch arm in the OFF position in the straight traveling state turns the steering wheel 8 to the right, and turns it to the B side when turning to the left. It is designed to close the contact circuit.

Further, 10 is a second switching switch for switching the traveling condition between the field traveling and the road traveling, and the second switching switch 10 is provided at an appropriate position such as the instrument panel 11 where the manual operation is easy. When the second switching switch 10 is set to the road running state, the A and B side contact circuits switched by the first switching switch 9 are connected to the flasher (direction indicator) 12 via the flasher unit 12a. Is configured to be connected to. That is, when the steering wheel 8 is turned to the right when traveling on the road,
It is displayed that the A contact circuit side of the first switching switch 9 is closed and the right-side flasher 12 automatically blinks and turns right. On the other hand, when the steering wheel 8 is turned left, the left-side flasher is turned on the contrary. 12 is configured to blink and turn left.

On the other hand, when the second switching switch 10 is set to the field traveling state, the A and B side contact circuits switched by the first switching switch 9 are connected to the solenoids 5R and 5L of the switching valve 5. Is configured. That is,
When the steering wheel 8 is turned to the right in this field running state, it is conducted to the right solenoid 5R and the switching valve 5 is switched. In this state, when the brake pedal 3 is stepped on, the hydraulic oil causes the right side brake 7 to move. When the steering wheel 8 is turned to the left, only the left side brake 7 is braked, and the side brake 7 is selectively braked. It is configured so that braking operation of 7 can be performed.

In the embodiment of the present invention configured as described above, when traveling on the road, when the second switching switch 10 is switched to this side, the switching contacts A and B of the first switch 9 are not on the switching valve 5 side. It will be connected to the flash circuit side. Therefore, the switching valve 5 maintains the neutral state, the left and right side brakes 7 are simultaneously braked, and the steering wheel 8 turns right or left, so that the switching of the first switching switch 9 interlocked with this. As a result, the flasher 12 on the turned side automatically blinks to indicate the turning direction.

On the other hand, in the state where the second switching switch 10 is switched to the field traveling side for traveling in the field, the solenoid 5R is switched by switching the first switching switch 9 associated with turning the steering wheel 8 right or left. , 5L is activated,
The corresponding one of the left and right side brakes 7 selectively performs the braking operation, which makes it possible to make a small turn, but the flasher 12 which is not necessary for traveling in the field does not operate.

As described above, according to the present invention, by separately depressing the single brake pedal 3, the left and right side brakes 7 can be selectively braked simultaneously and simultaneously. Therefore, as in the case where the conventional pair of side clutch pedals are provided, the foot space of the step portion is narrow and the habitability is poor, and there is no problem that the pedal operation becomes difficult, and a wide foot space can be secured.

Moreover, the selection of the left and right side brakes 7 is not performed by separately stepping the left and right side brake pedals as in the conventional case, but by setting the second switching switch 10 for running in the field, the steering operation is linked. It will be done automatically, and accordingly, the side brake 7
Since the selection operation for braking the vehicle and the confirmation operation thereof are not required at all, the reliability of the operation is improved to a great extent, and the safety is improved.

In addition, when the second switching switch 10 is switched to the road running side, the flashing operation can be automatically performed by the steering operation, which also has the advantage of contributing to the simplification of the driving operation. is there.

Of course, the present invention is not limited to the above-mentioned embodiment, but in the case where the present invention is implemented by an offset type agricultural tractor, one side is provided with the transmission case 13 and the other side is provided. The brake pedal 3 and the clutch pedal 14 are arranged at the same time, but at this time, the support shaft 15 that rotatably supports the pedals 3 and 14 has the same height as the input shaft 13a below the transmission case 13. If it is located at a position above, there is a limit to raising the ground height on that side, and therefore, as shown in FIGS. 4 and 5, the pedal support shaft 15 is installed immediately below the step plate 16, If this is connected to the corresponding side brakes, clutches, etc. by connecting it with an appropriate connecting member such as the link 17, it is possible to increase the ground clearance of the driver's seat 2 side portion in the offset type tractor. There is.

Further, the switching between the left-right simultaneous braking and the alternative braking may be switched not by switching between the field traveling and the road traveling but by the traveling speed, that is, the low speed traveling state and the high speed traveling state. Therefore, in that case, it can be set to be switched according to the number of rotations of the axle, the number of rotations of the engine, the traveling gear shift position, or the like.

[Effects] In summary, since the present invention is configured as described above, when the second switching switch means is switched to the field traveling state, a single brake is applied while steering the vehicle to steer the machine. When the pedal is depressed, the side brake on the steering operation side is brought into a braking state to allow traveling in the field, but at this time, there is no troublesome unnecessary flasher operation in the field.

On the other hand, when the second switching switch means is switched to the road running state, if a single brake pedal is depressed while the steering operation is performed to make a right turn or a left turn, the flashing operation on the steering side is automatically performed. At the same time, since the left and right side brakes are simultaneously braked, it is possible to make a right turn or a left turn while accommodating the flasher operation required for road traveling. Even with a single brake pedal, it is possible to drive in the field and on the road. The operability is improved without any damage.

[Brief description of drawings]

The drawings show an embodiment of a side brake device in a working vehicle according to the present invention. FIG. 1 is an overall side view of an agricultural tractor, FIG. 2 is a hydraulic circuit diagram of a side brake switching mechanism, FIG. 3 is an electric circuit diagram of the side brake switching mechanism, FIG. 4 is a perspective view of the instrument panel portion, FIG. 5 is a front view of a main portion showing a pedal portion of an offset type tractor, and FIG. 6 is a side view of the same. Is. In the figure, 1 is a traveling machine body, 3 is a brake pedal, 5 is a switching valve, 7 is a side brake, 8 is a steering wheel, 9 is a first switching switch, and 10 is a second switching switch.

Claims (1)

[Scope of utility model registration request] 1. A working traveling machine body provided with a steering wheel for steering the vehicle body to the left and right, left and right side brakes for respectively braking the left and right traveling wheels, and a left and right flasher means for indicating a direction. In the above, a single brake pedal is used for braking each of the side brakes, and between the brake pedal and each of the side brakes, the left and right side brakes are selectively braked by depressing the brake pedal. Brake switching means capable of switching to the simultaneous braking state is provided, and first switching switch means for switching between the steering wheel and the brake switching means and the left and right flasher means in accordance with the left and right steering of the steering wheel. , It is possible to switch to the field running state or the road running state, and switch to the road running state. At this time, the brake switching means is maintained in the simultaneous braking state regardless of the switching of the first switching switch means, and the left and right flasher means are connected so as to perform the selective operation on the switched side of the first switching switch means. When the vehicle is switched to the running state, the brake switching means performs selective braking on the side to which the first switching switch means is switched, and the left and right flasher means are connected so as to be in the inactive state regardless of the switching of the first switching switch means. A side brake device for a working machine body, comprising a second switching switch means.