JPS5914269Y2 - Tractor brake device - Google Patents

Description

[Detailed description of the invention] The present invention is equipped with left and right steering brakes that brake the left and right rear wheels respectively, and operates each brake at almost the same time when driving on the road. The present invention relates to a tractor that selectively performs a braking operation.

Conventionally, there was a technology (for example, Japanese Utility Model Publication No. 49-29140) in which the clutch and brake were operated with a single operating lever, but when a left-right steering brake was installed that brakes the left and right rear wheels respectively, In the case where a pair of left and right brakes are required, and two operation levers are used to operate each of the brakes, and the speed change operation for increasing/decelerating and forward/backward movement is performed using the shift levers, the number of levers increases in the above-mentioned conventional technology, making it difficult to perform plowing work, etc. The disadvantage was that driving operations were complicated.

In addition, there was a technology in which left and right brake pedals were installed to brake the left and right steering brakes, respectively, but it was necessary to install the brake pedals close to each other and connect them together when driving on the road. This made shifting operations complicated.

The present invention solves the above-mentioned conventional drawbacks by connecting left and right steering brakes for braking the left and right rear wheels respectively to a speed change lever for driving in parallel, so that the speed change lever can swing in a direction different from the speed change operation direction. The system selectively operates each of the brakes in conjunction with the motion, and connects each brake to a single brake pedal, allowing for speed change operations for acceleration/deceleration and forward/backward movement, as well as selective braking for left and right steering. The direction change operation can be performed by the speed change lever, and the number of levers to be handled during plowing work in the field can be reduced compared to the conventional method, and the traveling direction can be easily changed while maintaining the traveling speed at an appropriate level. By selectively braking the left and right steering brakes and simultaneously braking each brake using the brake pedal, the left and right rear wheels can be simultaneously braked even during work operation in fields, etc., compared to conventional technology that has a pair of left and right steering brake pedals. In addition, it is possible to prevent selective braking of the respective brakes during general road driving, to clearly differentiate between the braking function of the gear shift lever and the braking function of the brake pedal, and to prevent the braking function of the gear shift lever and the braking function of the brake pedal from being applied separately. The lever allows you to instantly brake the left and right rear wheels to easily avoid dangerous situations, while the shift lever allows you to perform gear changes and left and right braking in a correlated manner, increasing the speed of near-border changes of direction and puddling work. It is an object of the present invention to provide a brake device for a tractor that can be easily achieved.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Figure 1 is a schematic side view of the tractor, in which 1 is the engine, 2 is the clutch case, 3 is the front transmission case,
4 is a rear transmission case, 5 is a front wheel, 6 is a rear wheel, 7 is a rear axle, 8 is a PTO axis, 9° 10 is a three-point link for attaching a rotary work machine, etc., 11 is a lift arm, 12 is a driver's seat, 13 14 is a handle, and 14 is a driving main transmission lever, which has multiple sets of transmission gears and a hydraulic clutch (not shown) that constitute a power shift mission built into the front transmission case 3 by conventional means, and one engine output is transferred to a hydraulic transmission lever. It is formed so that the speed can be changed by operation and this can be transmitted to the rear axle 7.

As shown in FIG. 2, the above-mentioned hydraulic speed change output is taken out via the countershaft 15 and transmitted via the differential gear group 16, the left and right differential shafts 17.18, each final pinion 19.19, and the final gear 20.20. The hydraulic transmission output is transmitted to the left and right rear axles 7, 7, and the left and right differential shaft 17
, 18 are provided with left and right steering brakes 21 and 22.

As shown in FIGS. 2 to 4, a hydraulic switching valve 23 that is switched by the main shift lever 14 is fixed on the front transmission case 3, and the hydraulic pressure of a hydraulic pump (not shown) is transferred to the switching valve 23.
The hydraulic pressure is selectively applied to the plurality of hydraulic clutches of the power shift mission via the power shift transmission.

A shift fork 25 for slidingly displacing the spool 24 of the switching valve 23; a fork shaft 26 for slidably supporting the fork 25 in multiple stages; A continuous culm 28 to be engaged with the fork 25 is provided, and a square prism 29 is integrally formed on the continuous culm 28, and an inverted U-shaped leg 30 at the base end of the gear shift lever 14 is connected to the square prism 29 via a pivot 31. By pivoting the shift lever 14 in the longitudinal direction of the aircraft, the shift fork 25 is shifted in multiple stages, the spool 24 is slid to perform a hydraulic conversion operation, and the spool 24 is stopped. The configuration is such that only the speed change lever 14 can be swung in the left-right direction of the aircraft body.

Further, a guide plate 33 is provided in which a shift guide groove 32 is formed into which the middle of the shift lever 14 is loosely inserted, and a pair of end face U-shaped rails 34 are installed in the left and right direction on the front and rear inside of this guide plate 33.
．． 35 is fixedly installed, and a slide plate 36, 37 whose one end is brought into contact with the middle of the gear shift lever 14 from the left and right direction.
are provided, and their front and rear ends are fitted into the rails 34 and 35.

Furthermore, L-shaped links 38 and 39 are provided to connect the outer ends of each of the plays 36 and 37, respectively.

Each link 38° 39 is rotatably connected to a pivot 40, 41 at the middle, and a pin 42 at one end to a plate 36, 37.
．． 43, and the brakes 21 and 22
The other end of the above-mentioned bow-shaped link 38.39 is connected to the operating camshaft 44.45 via the link 46.47 and the rod 48°49, and the brake operation is performed by opening the guide plate 33 so as to be perpendicular to the guide groove 32. By inserting the intermediate gear shift lever 14 into the groove 50, that is, tilting the lever 14 to either the left or right, and pressing either of the levers 36 and 37, the L-shaped link 38 or 39 and the rod 48 or 49, by rotating the camshaft 44 or 45 via the link 46 or 47, operating either the left or right steering brake 21 or 22, and braking the rear wheel 6 via the left or right rear axle 7. It is formed into.

The guide groove 32 is formed linearly in the longitudinal direction of the aircraft body,
Further, the brake operation groove 50 is formed in the left-right direction at each shift position of the gear shift lever 14, and the gear shift lever 14 is swung back and forth to perform forward and backward operation, and the lever 14 is swung left and right to operate the left and right operation brake 21.゜22 is configured to operate.

Incidentally, the brake operation groove 50 at the neutral position and high speed position of the speed change lever 14 is almost unnecessary, so it is not necessary to form it.

Next, as shown in FIG. 2, a clutch pedal 51 and a brake pedal 52 are provided on the left and right sides of the clutch case 2.

The brake pedal 52 is fixed to a horizontal shaft 53.
A clutch pedal 51 is fixed to a cylindrical shaft 54 which is loosely supported in
1 to the main clutch.

Also links 56, 57, 58, 59 and rods 60.
The camshafts 44 and 45 of the left and right steering brakes 21 and 22 are connected to the horizontal shaft 53 via the shaft 61, and the left and right steering brakes 21 and 22 are operatively connected to the brake pedal 52.

The present invention is constructed as described above, and the gear shift lever 14 is always positioned in the guide groove 32 by a spring (not shown). For example, when the lever 14 is tilted to the left,
The left slide plate 36 is pushed and the L-shaped link 38
The camshaft 44 is rotated via the link 46 and the rod 48, and the left steering brake 21 is activated.At this time, the left rear wheel 6 stops and the right rear wheel 6 moves around it. However, if the tractor turns to the left and the gear shift lever 14 is tilted to the right, the right steering brake 22 is activated in the same manner as described above, the right rear wheel 6 is stopped, and the tractor is turned to the right. be.

Although the gear change guide groove 32 was formed in the longitudinal direction of the fuselage and the brake operation groove 50 was formed in the left-right direction of the fuselage, each groove 3
2.50 may be rotated 90 degrees and the shift lever 14 may be rocked back and forth to operate the left and right steering brakes 21 and 22. Also, the H-shaped shift guide groove in a mechanical transmission may be used as a brake. By using the operating groove 50, it is also possible to easily operate the left and right steering brakes 21 and 22 using a mechanical shift lever.

As is clear from the above embodiments, the present invention has the following advantages:
. and selectively actuate each brake 21, 22 with a single brake pedal 5.
2, the speed change lever 14 can be used to perform speed change operations for increasing/decelerating and forward/backward movement, as well as direction change operations by selectively braking the left and right steering brakes 21 and 22, and can be used in plowing work in fields, etc. By reducing the number of levers compared to the past, it is possible to maintain a proper running speed and easily change the running direction, and the shift lever 14 can selectively brake the left and right brakes 21 and 22, and the brake pedal 52 can be used to brake each brake. By simultaneously braking the left and right rear wheels 6 and 22, the left and right rear wheels 6 and 6 can be braked even when working in fields, etc., compared to the conventional technology that is equipped with a pair of left and right brake pedals.
It is possible to perform simultaneous braking of the brakes 21 and 22 during general road driving, and to prevent selective braking of each of the brakes 21 and 22 during general road driving, and to clearly use the braking function of the gear shift lever 14 and the braking function of the brake pedal 52. In an emergency, the left and right rear wheels 6, 6 can be always instantaneously braked via the brake pedal 52 to easily avoid a dangerous situation, while the gear shift lever 14 can be used to perform gear changes and left and right braking in a correlated manner. This has remarkable effects, such as being able to easily speed up direction changes at the edge of the ridge, raking work, etc.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic side view of a tractor, FIG. 2 is a plan view of the main parts, and FIGS. 3 and 4 are partially enlarged views thereof. 14 is a gear shift lever, 21 is a left steering brake, and 22 is a right steering brake.

Claims (1)

[Scope of utility model registration request] Left and right steering brakes 21 that brake the left and right rear wheels 6, 6, respectively
．． 22 are connected in parallel to the speed change lever 14 for traveling, and the brakes 21 and 22 are selectively operated in conjunction with the swinging of the speed change lever 14 in a direction different from the speed change operation direction. A brake device for a tractor, characterized in that brake pedals 21 and 22 are interlocked and connected to a single brake pedal 52.