JPH0419276A - Brake pedal device for working vehicle - Google Patents

Abstract

PURPOSE:To improve operability by respectively locating pedals to the one of first and second levers and the one of third and fourth levers to form brake pedals on both sides and coupling two other levers to a main brake pedal. CONSTITUTION:Since brake rods 5 and 6 on both sides are locked to levers 9, 10 and 11, 12 having oblong holes 13 - 16 formed therein, by stepping on, for example, a main brake pedal 2, the levers 9 and 12 coupled thereto are rotated, the brake rods 5 and 6 on both sides are pulled by means of the rear end parts of the oblong holes 13 and 16 to brake two wheels on both sides. In this case, lock parts 7 and 8 of the brake rods 5 and 6 are slid within the oblong holes 14 and 15 of the lever 10 and 11 of the brake pedals 3 and 4 on both sides, and brake pedals 3 and 4 on both sides are brought into a rest state through energization of a spring 19 without rotation. When the one of the brake pedals 3 and 4 on both sides is stepped on, only a brake pedal is rotated through the action of the oblong holes 13 - 16 to pull the brake rod 5 or 6, and other brake pedal is not interlocked.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a brake pedal device for a work vehicle, and in particular a main brake pedal that brakes left and right wheels simultaneously, and a main brake pedal that brakes left and right wheels independently. The present invention relates to a brake pedal device for a work vehicle equipped with a brake pedal.

[Background Art] Conventionally, working vehicles such as tractors and mowers have to have a turning radius as small as possible due to the nature of the work. Therefore, a brake pedal device is known that brakes either the left or right wheel independently to enable turning with an extremely small turning radius, and also allows all wheels to be braked by the main brake pedal (patent application). (Refer to Publication No. 1156160).

[Problems to be Solved by the Invention] The conventional brake operating device described above has right and left brake pedals rotatably provided on the brake shaft,
The brakes can be operated independently on the left and right sides. A main brake pedal is attached to the brake shaft, and by operating the main brake pedal, the left and right brake pedals are linked to perform braking.

Therefore, when the main brake pedal is operated, both or one of the left and right brake pedals rotates in conjunction with the main brake pedal, resulting in poor operability.

Therefore, a technical issue has arisen that needs to be solved in order to improve operability by making it possible to brake the left and right wheels individually or at the same time while preventing other brake pedals from interlocking when braking. Therefore, the present invention aims to solve this problem.

[Means for Solving the Problems] The present invention has been proposed to achieve the above object, and includes left and right brake pedals that operate the left and right brakes independently, and a brake pedal that interlocks the left and right brakes. In a work vehicle equipped with a main brake pedal, first to fourth levers are rotatably pivoted to a support shaft, and elongated holes in the circumferential direction are formed in the side surfaces of the first to fourth levers. wear it,
T-shaped locking portions are provided at the ends of the two left and right brake rods, one of the locking portions is engaged with the elongated holes of the first and second levers, and the locking portion of the other brake rod is engaged with the long holes of the first and second levers. are engaged with the long holes of the third and fourth levers, and the first or second levers are engaged with the long holes of the third and fourth levers.
A brake for a work vehicle characterized in that one of the levers and one of the third or fourth lever is provided with pedals, respectively, to serve as left and right brake pedals, and the other two levers are connected to the main brake pedal. The present invention aims to provide a pedal device.

[Function] The levers for pivoting the brake rods provided on the left and right brake pedals, which can be rotated separately, have elongated holes in the circumferential direction in their respective sides. Two levers connected to the main brake pedal are disposed near the lever, facing the levers of the left and right brake pedals, respectively, and the lever of the main brake pedal is also connected to the lever of the left and right brake pedals. A long hole similar to that is drilled. Then, the locking part of the left brake rod is engaged with the elongated hole of the lever of the left brake pedal and the lever of the main brake pedal opposite to the lever, and the lever of the right brake pedal and the main brake pedal opposite to the lever are engaged with the locking part of the left brake rod. The locking part of the right brake rod is engaged with the elongated hole of the brake pedal.

When one of the left and right brake pedals is pressed,
A brake rod that is engaged with the lever of the pedal is pulled to operate the brake. At this time, the locking portion of the brake rod slides within the elongated hole of the lever of the main brake pedal, so the main brake pedal does not rotate.

Also, when the main brake pedal is operated, the left and right brake rods are pulled and all wheels are braked, and at this time, the locking parts of the left and right brake rods are inserted into the long holes provided in the levers of the left and right brake pedals. The left and right brake pedals do not rotate.

[Example 1] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 shows the brake pedal device of a work vehicle (1)
The main brake pedal (2) on the left in the figure, the left brake pedal (3), and the right brake pedal (4). The front ends of the left brake rod (5) and the right brake rod (ra) connected to the left and right brake devices (not shown) are formed in a T-shape, and these locking parts (7) and (8) are connected to the main brake. Pedal (2) and left and right brake pedals (3)
The levers (9)Oo) and H(l) provided on the levers (4), respectively, have elongated holes (l■(14)) (one (lE9) is engaged with).

As shown in Fig. 2, the shirt 1-(r7) with the main brake pedal (2) fitted is loosely inserted into the support shaft (the other end is protruded) and the left brake pedal (3) is attached to the protruding part. , the right brake pedal (4) is rotatably fitted into the left and right brake pedals (3) and (4).Lever (9) (■) is disposed on both the left and right sides of the left and right brake pedals (3) and (4), and the lever (9) (Insert +21 into the shaft (r7) and press the main brake pedal (2).
It is formed to rotate integrally with the

The left and right brake pedals (3) and (4) are provided with levers (10) and (l1) that respectively face the lever (9)U) of the main brake pedal (2), and the levers (9)
The locking part (7) of the left brake L/--1-rod (5) is locked to the lever (11) and the lever (I2), and the locking part (7) of the right brake rod (RA) is locked to the lever (11) and the lever (I2). (8) is locked.

As shown in FIGS. 1 and 3, the lever (9) (1
0), (IIXLI!1 (7) A long hole 01 (14) Oc90* in the circumferential direction is opened on the side surface, and the long hole (II
(x)(1'i)O* D The locking portions (7) and (8) are slidably inserted loosely, and the left and right brake rods (5) (
6), the elongated hole (1 mm) θ is positioned at the rear end of the pupil.

As shown in Fig. 1, a spring is inserted between the intermediate part of the main brake pedal (2) and the vehicle body (not shown).
The main brake pedal (2) is biased upward, and although not shown, it is natural that the left and right brake pedals (3) and (4) are similarly biased upward by springs.

As mentioned above, the long hole (1■ (+/1) (1 (IE)
Since the left and right brake rods (5) and (6) are locked to the lever (9XlO), (IIXψ) provided with Lever (9) (2) connected to pedal (2)
) rotates, and the left and right brake rods (5) and (6) are pulled at the rear end of the IE9, and both left and right wheels are braked. At this time, the left and right brake pedals (3) and (4) are rotated. The locking portions (7) and (8) of the brake rods (5) and (6) slide within the elongated holes (14) of the levers (+o) and (+I), and the left and right brake pedals ( 3) and (4) do not rotate and remain stationary due to the bias of the spring described above.

Also, although not shown, the left and right brake pedals (3) (4)
), the elongated hole θ → (b) (F
Due to the action of D(+119), only that brake pedal rotates and pulls the brake rod (5) or (6), and the other brake pedals are not interlocked.

FIG. 5 shows an embodiment in which the front mower is equipped with a brake pedal device (1). Front mowers, which are mowers for mowing grass attached to the front of the vehicle, have traditionally been equipped with a brake device only on the front wheels, so when sudden braking occurs, the weight of the mower can cause a so-called nose dive, causing the rear wheels to float up. There were safety issues.

Therefore, in this embodiment, a brake device (A) is provided to brake the rear wheels, and the brake rod Q1) of the brake device (1) is connected to a lever provided on the main brake pedal (2). . The main brake pedal (2) can be configured to be separated from the left and right brake pedals (3) and (4) and brake only the rear wheel brake device (1), but in this embodiment, the brake pedal By connecting to the main brake pedal (2) of the device (1), all wheels can be braked simultaneously, improving braking performance and stabilizing the braking posture.

Note that this invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that this invention extends to such modifications.

``Effects of the Invention: This invention is constructed as detailed in the above embodiment, so that the left and right brake pedals do not interlock when the main brake pedal is operated, but the left and right brake pedals interlock when the main brake pedal is operated. This improves operability by preventing contact with the driver's legs or collision, and improves the quality of the operation feeling given to the driver, contributing to improved quality.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a perspective view of the brake pedal device, Fig. 2 is a rear sectional view thereof, Fig. 3 is a side view of the main part, and Fig. 4 shows the operation of the main part. The side view and FIG. 5 are perspective views of a brake pedal device showing another embodiment. (1)... Brake pedal device (2)...
Main brake pedal (3) Left brake pedal (4) Right brake pedal (5) Left brake rod (6) Right brake Cow rod (7) (8) --- Locking part (1 x) (1 (IED) --- Long hole (9) (1
0) (I +) (IJ・・・・・− lever (日−・・・・
・・Support shaft

Claims (1)

[Claims] In a work vehicle equipped with left and right brake pedals that operate the left and right brakes independently, and a main brake pedal that interlocks the left and right brakes, the first to fourth levers are rotatably pivoted to the support shaft. Arriving at the first to fourth
A long hole in the circumferential direction is bored in the side surface of the lever, T-shaped locking parts are provided at the tips of the two left and right brake rods, and one of the locking parts is connected to the first and second levers. and engages the locking part of the other brake rod with the long holes of the third and fourth levers, and also connects one of the first or second lever with the third or fourth lever. A brake pedal device for a work vehicle, characterized in that a pedal is provided on one of the four levers to serve as a left and right brake pedal, and the other two levers are connected to a main brake pedal.