JPH0320193Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention is designed to move along a tobacco cultivation ridge or a tea cultivation ridge while straddling the ridge.
This invention relates to a travel braking device for agricultural vehicles that perform elevated agricultural work such as sowing, seedling planting, and harvesting.

"Prior Art" Conventionally, as shown in Japanese Utility Model Application Publication No. 53-160137, there has been a technique in which left and right brake pedals are provided and the driving gear is returned to neutral by braking.

``Problems to be Solved by the Invention'' However, in the prior art described above, the traveling gear returns to neutral only when braking is performed using the parking brake lever. There were safety and functional problems, such as the tendency for the vehicle to start suddenly at the next start, and the running load to change rapidly.

Furthermore, as shown in Japanese Utility Model Application Publication No. 52-96032, there was a technique for disengaging the travel clutch by simultaneously operating the left and right brake pedals, but the clutch was disengaged using the connecting members of each pedal. When the coupling member is disengaged, the clutch will not disengage even if all the pedals are operated at the same time, and the gear shift will be maintained even if the travel clutch is disengaged, so it is easy to start suddenly by engaging the travel clutch. There were functional and safety issues such as:

"Means for Solving the Problem" However, the present invention includes a neutral return means for returning the travel gear shift lever to the neutral position, and a braking detection means for interlocking with each depression operation of the left brake pedal and the right brake pedal. The present invention is also characterized in that it is provided with linking means that operates the neutral return means in conjunction with the braking detection means when both the left and right brake pedals are depressed.

``Operation'' Therefore, since a braking detection means is provided that is linked to each depression of the left and right brake pedals, there is no need to specially connect each pedal as in the past, and the conventional connecting member is unnecessary, making it possible to forget to connect each pedal. In addition, by pressing both pedals, the braking detection means and the neutral return means are linked via the linking means, so the traveling gear can be returned to neutral simply by pressing each pedal at the same time. Even if the vehicle is stopped by pressing each pedal, it can be prevented from suddenly starting the next time, and it can also prevent the running load from changing rapidly, improving running and braking functions and making it safer than before. Therefore, it is possible to easily improve the performance and handling operability.

"Embodiment" Hereinafter, an embodiment of the present invention will be described in detail based on the drawings. Figure 1 is an overall right side view of the elevated agricultural vehicle.
FIG. 2 is an overall plan view of the same. In the figure, 1 and 2 are front and rear body frames, and 3 is a body frame 3 whose rear end is fixed to the rear body frame 2. The front end side of the body frame 3 is attached to the front body frame 1. A pivot pin 5,5 is attached and connected so as to be swingable, a front axle frame is detachably attached to both ends of the front body frame 1 via U-bolts 6, 6, and 7,7 is a front axle frame 5,5. The front axle case 8, 8 is supported horizontally rotatably on the front axle case 7, front wheels 8, 8 are front running wheels that are mounted on the lower end of the front axle case 7, 7, and the front wheels 9a, 9b are mounted on the upper end of the front axle case 7, 7. Left and right front wheel drive hydraulic motors are installed via reduction gear cases 10, 10, and bolts 12, 12 are attached to both ends of the rear body frame 2.
and a rear axle case that is slidably attached and detached via fixed mounting plates 13, 13, 14, 14 are rear wheels that are rear running wheels that are mounted on the lower ends of the rear axle cases 11, 11, and 15a, 15b are rear axles. Case 11,1
Hydraulic motors for driving the left and right rear wheels are attached to the upper end of 1 via reduction gear cases 10, 10, 16 is an engine section in which an engine 17 is mounted approximately in the center of the front and rear wheels 8, 14 of the left side body frame 3, and 18 is an engine section. A driving operation section has a driving frame 19 fixed approximately at the center of the front and rear wheels 8, 14 of the right side body frame 3, and is equipped with a driver's seat 20, a steering wheel 21, etc.; 22 is a working oil tank installed below the driver's seat 20; Reference numerals 23 denote left-row and right-row hydraulic motors 9a, 15a, 9b, and 15b mounted in the center of the front part of the body frame 3;
Two hydraulic pumps 24 in tandem for operation
Hydraulic pump unit with built-in a, 24b, 25
is drivingly connected to the engine 17 and its front output shaft is connected to the input shaft of the hydraulic pump unit 23.
A PTO transmission case 26 is a PTO housing for taking out the rear part of the PTO which is detachably and directionally connected to the PTO output shaft 27 at the rear of the transmission case 25. A PTO housing 28 is connected to the hydraulic pump unit 23 to perform a traveling speed change operation. Travel gear lever, 29
is the PTO installed in the PTO transmission case 25.
A hydraulic elevator with a gear shift lever 30 provided approximately at the center of the rear body frame 2 and having a lift arm 31;
Reference numeral 23 denotes a rotary tiller which is towed to the rear of the machine via a lower link 23 and a top link 34 and is equipped with a rotary 35, which allows the machine to run across tobacco cultivation rows, tea cultivation rows, etc. 32 to perform tillage work.

As shown in FIGS. 3 to 5, a pedal shaft 37 is installed on the lower surface of the driving frame 19 via brackets 36, 36, and the base ends of left and right brake pedals 38, 39 brake the left and right rear wheels 14, 14. and a base end of a main clutch pedal 40 that continuously controls the output of the engine 17 are supported on the pedal shaft 37, and a brake wire 42 and a pedal upright holding spring 43 are connected to a link 41 at the base ends of the brake pedals 38, 39. let One end of the combination plate 44 is supported by the left brake pedal 38, and the other end of the combination plate 44 is removably engaged with the right brake pedal 39, so that the left and right brake pedals 38, 39 are integrally interlocked, or An engagement arm 48 that is provided so as to be independently operable, supports an engagement link 46 integrally formed with a parking brake lever 45 via a bracket 47 near the left brake pedal 38, and is engaged with the engagement link 46. is fixed to the left brake pedal 38, and the left and right brake pedals 38, 39 are connected by the coupling plate 56,
The engaging link 46 and the engaging arm 48 are engaged to hold the braking position at the braking position.

Further, a left and right braking detection link 51 is attached to the driving frame 19 in front of the brake pedals 38 and 39 via a bracket 49 and a support shaft 50 so as to be able to swing back and forth, and a swing plate is attached to the upper end of the link 51 via a fulcrum shaft 52. 53 is rotatably supported, and the left and right braking detection arms 54, 5
5 base ends are fixed to both ends of the plate 53, and the tips of the arms 54 and 55 are extended to contact positions with the left and right brake pedals 38 and 39, and the brakes are applied by stepping on the brake pedals 38 and 39. The pedals 38 and 39 come into contact with each brake detection arm 54 and 55, and when one pedal 38 or 39 is operated, the swing plate 53 is oscillated about the fulcrum shaft 52, and both pedals 38 and 39 are By simultaneous operation, the left and right brake detection links 51 are formed to swing back and forth around the support shaft 50 via the swing plate 53.

As shown in FIGS. 4, 6 to 9, a bearing 57 is fixed to the body frame 3 through a bracket 56, and a fulcrum shaft 58 is supported on the bearing 57. The base end of the speed change lever 28 is connected to the fulcrum shaft 58 via a pin 59 so as to be swingable in the center direction, and the hydraulic pumps 24a, 2
Adjustment plates 62 and 63 are connected to swash plate angle adjustment shafts 60 and 61 for controlling the discharge amount of 4b, and a speed change link 64 integrally connected to the fulcrum shaft 58 is connected to the adjustment plates 62 and 63.
63 via transmission rods 65 and 66. In addition, a guide groove 67 is provided in the lever guide plate 68 through which the middle of the traveling speed change lever 28 is loosely inserted, a plurality of notches 69 into which the intermediate flat portion 28a of the lever 28 is engaged, and a lever neutral return spring 70. A neutral position locking step 71 that holds the lever 28 neutrally by force is formed on the inner edge of one side of the guide groove 67, and a spring seat 72 that freely rotatably supports one end on the fulcrum shaft 58. and gear lever 2
8 through a guide pin 73, and the force of the locking holding spring 74 engages the flat part 28a of the gear shift lever 28 with the notch 69 to move the lever 28 to an arbitrary position. Formed to hold.

Further, a neutral return arm 76 is horizontally rotatably attached to the upper surface of the body frame 3 inside the travel gear shift lever 28 via a support shaft 75, and the arm 76 is connected to the left and right brake detection link 51 with the neutral return wire 7.
7, the left and right brake pedals 3
The arm 76 is brought into contact with the gear shift lever 28 in conjunction with the operation of the link 51 by 8 and 39, and the spring 74
The shift lever 28 is disengaged from the notch 69 against the force, and the spring 70 causes the shift lever 28 to return to contact with the locking step 71, and the left and right brake pedals 38,
The gear shift lever 28 is formed so as to automatically return to the neutral position only when the brake levers 39 and 39 are simultaneously operated in conjunction with this.

As is clear from the above-mentioned configuration and drawings, the neutral return arm 76, which is a neutral return means for returning the traveling speed change lever 28 to the neutral position, is interlocked with each depression of the left brake pedal 38 and the right brake pedal 39. It is provided with braking detection arms 54, 55 which are braking detection means to cause the brake to move, and is a linking means that operates the neutral return arm 76 in conjunction with the braking detection arms 54, 55 when both the left and right brake pedals 38, 39 are depressed. A certain left and right braking detection link 51 is provided.

As shown in FIG. 10, the brake pedal 3
The upper pedal arm 78 and lower pedal arm 79 of 8, 39 are telescopically inserted and connected, and each arm 78, 79 is pulled with a force slightly larger than the tensile force of the brake wire 42 necessary to brake the rear wheel 14. A brake mechanism (not shown) in which a pedal holding spring 80 that extends and holds the brake pedal is inserted into the arm 78, and the spring 80 absorbs the excessive pedal force of the brake pedals 38 and 39, and connects the brake wire 42. It is formed to prevent excessive operating force from being applied to the

The present invention is constructed as described above, and during agricultural work, etc., the coupling plate 44 is detached from the right brake pedal 39, and only the brake pedal 38 or 39 on the left or right side in the steering direction of the handlebar 21 is operated by foot. Rear wheel 1 on either the left or right side
4 to brake and turn left and right, at this time,
As shown in FIG. 8, the brake detection arm 55 on this side contacts the depressed pedal 39, swings the swing plate 53 about the fulcrum shaft 52, and keeps the left and right brake detection links 51 stationary.

In addition, when driving on the road, the differential brake pedals 38 and 39 are integrally connected by the coupling plate 44, and when both the pedals 38 and 39 are depressed to simultaneously brake the left and right rear wheels 14 and 14, as shown in FIG. By simultaneously operating both pedals 38 and 39, the left and right brake detection link 51 is tilted around the support shaft 50, and the neutral return arm 76, which is interlocked with the link 51 via the wire 77, is connected to the travel gear shift lever 28. When brought into contact with each other, the flat portion 28a of the lever 28 is separated from the notch 69 of the lever guide groove 67 against the spring 74, and the speed change lever 28 is automatically returned to the neutral position by the spring 70.

"Effects of the Invention" As is clear from the above embodiments, the present invention has a neutral return means 76 that moves the travel gear shift lever 28 back to the neutral position, and a neutral return means 76 that is linked to the depression operations of the left brake pedal 38 and the right brake pedal 39. It is equipped with braking detection means 54, 55 and a linking means 51 that operates the neutral return means 76 in conjunction with the braking detection means 54, 55 when both the left and right brake pedals 38, 39 are depressed. Since braking detection means 54 and 55 are provided which are linked to the respective depression operations of the left and right brake pedals 38 and 39, there is no need to specially connect the respective pedals 38 and 39 as in the past, and the conventional connecting member is unnecessary. It is possible to eliminate erroneous operations such as forgetting to connect the pedals 38 and 39, and the braking detection means 54 and 55 and the neutral return means 76 are linked via the linking means 51 by pressing both of the pedals 38 and 39. The driving gear can be returned to neutral simply by pressing the pedals 38 and 39 at the same time, and even if the pedals 38 and 39 are pressed to stop, it is possible to prevent a sudden start at the next start. It is possible to prevent sudden changes in the speed, and it is possible to easily improve running and braking functions, as well as safety and handling operability, compared to the conventional ones.

[Brief explanation of the drawing]

Fig. 1 is a side view of an elevated agricultural vehicle showing an embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a side view of the driving operation section, Fig. 4 is a front view of the main parts, and Fig. 4 is a front view of the main parts. 5 is a side view of the same, FIG. 6 is an operational system diagram, FIG. 7 is a partial plan view of the same, FIGS. 8 and 9 are explanatory views of the same, and FIG. 10 is a sectional view of the brake pedal. 28... Traveling gear shift lever, 38... Left brake pedal, 39... Right brake pedal, 51... Brake detection link (coupling means), 54, 55... Brake detection arm (brake detection means), 76... Neutral Return arm (neutral return means).

Claims (1)

[Scope of utility model registration request] It includes a neutral return means 76 that moves the traveling speed change lever 28 back to the neutral position, and braking detection means 54, 55 that interlocks with each depression operation of the left brake pedal 38 and the right brake pedal 39. A travel braking device for an agricultural vehicle, characterized in that a linkage means 51 is provided which operates a neutral return means 76 in conjunction with brake detection means 54, 55 when both brakes are depressed.