JPH0237624Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a return mechanism for a brake pedal and a defrock pedal provided in an agricultural tractor after being operated by the foot.

(B) Prior Art In addition to a brake device for braking, agricultural tractors are equipped with a differential lock mechanism to prevent the differential gear mechanism from operating and reducing straight-line performance during work in the field. There is. The differential pedal, like the brake pedal, is operated with the right foot and is located on the right side of the agricultural tractor, with the brake pedal at the front and the differential pedal at the rear.

A deflock device is a mechanism that is locked only while the operator is depressing the pedal with his or her foot.
As soon as you stop stepping on the pedal, the pedal returns to its original position and the differential lock is released. The same applies to the brake pedal, only when the foot is pressed.

The defrot lock operation is only performed when working in the field while moving straight ahead, and the brakes are not applied, rather, the foot accelerator pedal is pressed down with the left foot to accelerate while working. I will do it. When you reach the edge of the field and turn around, you release the differential lock, depress the brake pedal, and make the turning radius as small as possible.

Therefore, the brake pedal and the differential lock pedal are depressed selectively, and both are not operated at the same time.

Also, I didn't know how much to press down on the defrock pedal, and as I continued to work on it, I ended up applying too much force and pressing it too hard, and excessive force was applied to the shifter fork and shifter, even though there was a return spring. This makes it difficult for the defrock pedal to return even if it is released.

Especially in wet fields, no matter how hard you press the deflock pedal, if the tractor's steering wheel is turned to the left or right, you will think that the deflock is not engaged, and if you press it even harder, this problem will occur.

The return spring of the conventional deflock pedal was developed in 1975.
As in No. 34943, it was installed independently on the outside, or it was installed on the differential shifter fork or shifter shaft.

(c) Problems to be solved by the invention In the case where the conventional single return spring makes it difficult to return the differential gear or the differential pin, the present invention connects the return spring between another pedal, such as the brake pedal, and its interlocking mechanism. When the defrock pedal is released from the depressed state, instead of being pulled back by a simple static return spring, the return spring itself is pulled in the opposite direction by the brake pedal. The system attempts to forcibly release the deflock by dynamically shaking the vehicle.

(d) Means for solving the problem The purpose of the present invention is as described above, and the configuration for achieving the purpose will be explained below.

In an agricultural tractor, a brake operating mechanism and a differential lock operating mechanism are provided close to each other, and a return spring is provided between the links or arms of both operating mechanisms, and the return spring is used for both the brake pedal and the differential pedal. It is something that

(e) Embodiments and operations The purpose and configuration of the present invention are as described above, and the operations of the present invention will also be explained based on the configuration of the embodiment shown in the attached drawings.

FIG. 1 is a side perspective view showing the brake pedal mechanism and the differential lock operating mechanism. Figure 2 is also a plan view.
FIG. 3 is a side perspective view with the brake pedal depressed. FIG. 4 is a side perspective view with the defrock pedal depressed.

The left and right main frames 25L and 25R are installed from the front end to the rear end of the agricultural tractor.
A mission case 23 is sandwiched between these.

A rear axle housing 3 is protruded from the left and right sides of the transmission case 23, and a brake case 15 is protruded from the rear axle housing 3.
A brake shoe and a brake drum are constructed within a brake case 15, and an arm 14 that extends the brake shoe is provided in a protruding manner. Further, a differential shifter shaft 11 is provided on the upper part of the transmission case 23, projecting to the right side, and an arm 10 is provided projecting from the differential shifter shaft 11.

Both the brake operating mechanism and the differential lock operating mechanism are provided on the side surface of the main frame 25R on the right side of the aircraft body. 24 is the step on the right side.

The brake pedal 1 is arranged in front of the step 24, and the base of the brake pedal 1 is connected to the bearing sleeve 1.
It is supported by 8. An arm 6 is provided on the brake pedal 1, and a link 7 is interposed behind the arm 6. The rear end of the link 7 is pivotally supported by a bell crank 12 that is pivotally supported on a pivot shaft 19, and the other end of the bell crank 12 is pivotally connected to an arm 14 of a brake case 15 via a turnbuckle link 13. .

A parking brake lock arm 5 is pivotally supported on a pivot shaft 22 next to the brake pedal 1, and a lower locking portion is locked to a stopper 21 of the brake pedal 1 in a depressed state. Reference numeral 16 denotes a fulcrum cross-over spring for the parking brake lock arm 5, which biases the arm 5 in two directions. 17 is a brake switch.

Next, 2 is the defrock pedal, and the pivot shaft 20
is supported by. An arm 8 of the differential gear pedal 2 is provided, and a link 9 is pivotally connected from the end of the arm 8 to an arm 10 of the differential shifter shaft 11.

The return spring 4, which is the main part of the present invention, is interposed between the spring receiving piece 7a of the link 7 of the brake operating mechanism and the spring receiving hole 8a provided on the opposite side of the arm 8 of the defrock operating mechanism. .

FIG. 3 shows a state in which the brake pedal is depressed. In this case, once the arm 8 of the differential lock operating mechanism is rotated in the direction of releasing the differential lock, it cannot rotate any further and becomes in a stopped state.
One end of the return spring 4 is fixed. If the defrock pedal does not return to the release direction even after stopping the depression of the brake pedal 2, the return spring 4 will forcefully pull the arm 8 in the release direction due to the depression of the brake pedal. It will be canceled in due course.

Conversely, in FIG. 4, the brake pedal is released from the depressed state, and the differential pedal 2 is released.
is depressed and the arm 8 rotates backward below the pivot shaft 20, the return spring 4 is moved to the spring receiving piece 7a.
It is pulled as a fixed point.

In this case as well, since the brake link 7 is provided with an upward stopper on the brake pedal 1, it cannot move further rearward, and the spring receiving piece 7a serves as a fixed point.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

Firstly, even if you are defrocking in a wet field, the steering wheel will be taken off, so if you press the deflock pedal even harder, the defrot fork, defrot shifter, defrot pin, defrot gear, etc. will get stuck, and when going around the edge of the field. Even if you take your foot off the defrot pedal, it may not return to its original position. In this case, the next step on the brake pedal can be used to pull the return spring and shake the defroc pedal to return it dynamically. As a result, the deflock condition continued and the field was unable to move around the edge of the field, resulting in vehicles no longer riding up on ridges or falling into ditches.

Second, the number of parts can be reduced by using one return spring, which was conventionally provided for both the brake pedal and the differential lock.

[Brief explanation of drawings]

FIG. 1 is a side perspective view showing the brake pedal mechanism and the differential lock operating mechanism. Figure 2 is also a plan view.
FIG. 3 is a side perspective view with the brake pedal depressed. FIG. 4 is a side perspective view with the defrock pedal depressed. 1...Brake pedal, 2...Diff lock pedal, 4...Return spring.

Claims (1)

[Scope of utility model registration request] In an agricultural tractor, a brake operating mechanism and a differential lock operating mechanism are provided close to each other, and a return spring is provided between the links or arms of both operating mechanisms, and the return spring is used for both the brake pedal and the differential pedal. Brake pedal and defrok pedal structure featuring: