JPH0355452Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a foot brake device in which both a brake operation and a clutch operation can be performed with one brake pedal.

(Prior Art) Conventionally, for riding working machines such as riding lawn mowers, brake operation and clutch operation are performed in conjunction by stepping on the foot brake, which facilitates operation.
There are known devices in which some members are omitted.

When operating the clutch and brake by operating the foot brake pedal in this way, the strokes for clutch and brake operation are short, so
The parts that overlap each other become smaller. Therefore, the present applicant previously filed Japanese Patent Application No. 59-29201.
A structure is proposed in which a bracket fixed to a foot brake pedal and a brake rod are engaged through an elongated hole to increase the stroke.

(Problem to be solved by the invention) Even with a foot brake device equipped with a brake pedal that also functions as a clutch operation as described above, in order to smoothly start and stop, it is necessary to apply a weak force at the beginning of pressing the pedal, and to apply it when driving on a slope. In order to reliably stop within a short distance, the pedal force must be increased.

A certain degree of skill is required to increase or decrease the force applied to the pedal in this manner, and those who are inexperienced with the operation may not be able to operate the work equipment smoothly, especially when starting and stopping it.

(Means for Solving the Problems) In order to solve the above problems, the present invention has a first spring, a second spring, and a third spring attached to the bracket fixed to the foot brake pedal, and the first spring is attached to the foot brake pedal. The second spring is fixed to the cable, and the third spring is fixed to a connecting member connected to the brake rod via a limiter spring, respectively, and the connecting member and the bracket are engaged through an elongated hole. Furthermore, the elastic force of the third spring is set to be weaker than the elastic force of the limiter spring.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a side view of a riding lawn mower as an example of a riding working machine according to the present invention, and FIG. 2 is a plan view of the riding lawn mower.

The frame 2 of the riding work machine 1 includes two left and right main frames 2a, 2a extending in the front-rear direction, and cross members 2b, 2b installed between the front and rear ends of the main frames 2a, 2a. At the front and rear of the frame 2, there are two front wheels 3, 3 on the left and right that serve as steering wheels, and rear wheels 4, 4 that serve as driving wheels.
are provided, and the front wheels 3, 3 are rotationally steered by a handle 5.

Further, an engine 6 is mounted approximately at the center of the frame 2 in the longitudinal direction, and this engine is a vertical engine with a vertical crankshaft, and an output shaft 7 is suspended from the engine 6. A drive pulley 8 is fitted to the output shaft 7, and a belt 11 is stretched between the drive pulley 8 and a driven pulley 10 fitted to an input shaft 9 supported at the rear of the machine, and the rotation of the input shaft 9 is controlled by a bevel gear. 12 to the transmission gear of the transmission case 13, and the rotation of this transmission gear is transmitted to the rear wheel shaft 14 via the reduction gear.

Further, a cutter housing 16 containing a cutter blade 15 is arranged between the front wheels 3, 3 and the rear wheels 4, 4, and the cutter housing 16 is connected to a link 17...
It is supported via the frame 2 so that it can be raised and lowered freely. A shaft 18 is rotatably inserted into the cutter housing 16 via a bearing, the cutter blade 15 is fixed to the lower end of the shaft 18, and a driven pulley 19 is fitted to the upper end of the shaft 18. Pulley 20 fitted to the lower end of input shaft 9
A belt 21 is stretched between them, and the cutter blade 15 is rotated by the power of the engine 6.

On the other hand, a drum brake is built into the transmission case 13, and a brake arm 23 for operating the drum brake is attached to the transmission case 1.
This brake arm 23 is connected to a connecting arm 24 provided on the main frame 2a by a rod 25, and the connecting arm 24 is made up of two plates 26 and 27 as shown in FIG. , the brake rod 28 is inserted into the long hole formed in the plate 27.
The rear end of the brake rod 28 is tied together, and the front end of the brake rod 28 is connected to a foot brake pedal 30 via a connecting member 29. On the other hand, a rod of a connecting member 31 is engaged with a long hole formed in the plate 26 of the connecting arm 24, and this connecting member 31 is connected to the seat 32.
Parking brake lever 3 located below the side of
A parking brake cable 34 connected to No. 3 is connected.

By stepping on the foot brake pedal 30, the connecting arm 24 rotates clockwise in FIG. 1 via the brake rod 28, and this rotation operates the brake arm 23 to effect braking. At this time, the rod of the connecting member 31 is engaged with the elongated hole in the plate 26 of the connecting arm 24, so it does not move. Similarly, when the parking brake lever 33 is operated, the brake rod 28 does not move.

Fig. 3 is an enlarged side view showing the foot brake part, and Fig. 4 is a side view seen from direction A in Fig. 3. A bracket 36 is fixed to the foot brake pedal 30. As shown in FIG. 4, this bracket 36 has a U-shaped planar shape in which plates 37 and 38 are connected by a connecting portion 39, and the front ends of a first spring 40 and a second spring 41 are fixed to the plate 38. A third spring 42 is attached to the plate 37.
The front end of is fastened. The rear end of the first spring 40 is connected to a clutch cable 44 attached to a bracket 43 provided on the main frame 2a.
The second spring 41 is connected to a clutch cable inner 45 on the fuselage side.
The rear end is tied to. Further, the third spring 42 is engaged with a hole 48 formed in the cylindrical body 47 of the connecting member 29. Here, the connecting member 2
A flange 49 is formed at the rear end of the hole 48, and a limiter spring 5 is inserted between the flange 49 and a ring member 50 slidably provided on the outer periphery of the cylinder 47.
1 and inserting the shaft 52 screwed onto the front end of the brake rod 28 into the cylindrical body 47,
A pin 53 is inserted into the front end of the shaft 52 through a slit provided in the axial direction of the cylinder 47, and by applying the pin 53 to the front end surface of the ring member 50, the brake rod 2 is inserted through the limiter spring 51.
8 is connected to a connecting member 29. In addition, the cylindrical body 4
The proximal end of a rod 54 is fixed to the front end of the bracket 7, and the distal end of the rod 54 is engaged with an elongated hole 55 formed in the plate 37 of the bracket 36. Here, the elastic force of the limiter spring 51 is the third
The elastic force of the spring 42 is set to be stronger than that of the spring 42.

In the foot brake device as described above, when the driver depresses the foot brake pedal 30 and rotates the foot brake pedal 30 counterclockwise in FIG. 3 about the shaft 35, the bracket 36 also resists the second spring 41. and rotate as one,
The first spring 40 causes the clutch cable 4 to
The clutch cable inner 45 of No. 4 is pulled and the clutch is gradually disengaged. In this case, the first spring 40 serves to gradually disengage the clutch and to escape excessive force acting on the clutch cable inner 45 when the clutch is suddenly depressed.

Further, in parallel with the above operation, a braking operation is performed. This braking operation is performed in two stages. Specifically, when the foot brake pedal 30 is started to be depressed, the connecting member 29 moves slightly to the left in the figure due to the tensile force of the third spring 42. This movement is smaller than the amount of movement of the bracket 36, and the tip of the rod 54 moves relatively rearward within the elongated hole 55. Therefore, a weak braking force will be applied. Further, at this stage, the limiter spring 51 is not compressed because its elastic force is greater than that of the third spring 42.

Next, when the tip of the rod 54 hits the rear end surface of the elongated hole 55, the connecting member 29 is pulled forward together with the bracket 36, and the brake rod 28 is pulled forward by the elastic force of the limiter spring 51.
It is pulled forward together with 9 and a strong braking force is generated.

Also, when you take your foot off the foot brake pedal, the second
The spring force of the spring 41 causes the foot brake pedal 30 and the bracket 36 to rotate clockwise and return, and this return connects the clutch and releases the braking force. Since this braking force acts in two stages as described above, a smooth start is achieved.

(Effects of the invention) As explained above, according to the invention, both the brake operation and the clutch operation can be performed smoothly by operating the foot brake pedal.
In addition, the braking force is applied in two stages depending on the amount of rotation of the foot brake pedal, so it is difficult for drivers to apply less braking force on flat terrain and stronger braking force on downhill slopes. It can be done easily regardless of the degree. In addition, the first, second, and third springs are attached to the bracket fixed to the foot brake pedal, which simplifies the work when assembling the foot brake device, and also allows the connecting members of the foot brake device to be concentrated in one place. It is also advantageous in terms of space because it is placed in the same position.

[Brief explanation of drawings]

Fig. 1 is a side view of a riding lawn mower to which a foot brake device according to the present invention is applied, Fig. 2 is a plan view of the riding lawn mower, and Fig. 3 is an enlarged side view of the main parts of the invention.
4 is a plan view seen from direction A in FIG. 3. FIG. In addition, 1 in the drawing is a riding lawn mower, 2 is a frame, 23
is a brake arm, 24 is an arm, 28 is a brake rod, 29 is a connecting member, 30 is a foot brake pedal, 36 is a bracket, 40 is a first spring, 41 is a second spring, 42 is a third spring.
44 is a clutch cable, 47 is a cylindrical body, 51 is a limiter spring, and 55 is a long hole.

Claims (1)

[Scope of utility model registration request] In a riding work machine equipped with a foot brake pedal at the front of the machine, a bracket is fixed to the foot brake pedal, and the first bracket is attached to the foot brake pedal.
The front ends of the spring, the second spring, and the third spring are fixed, the rear end of the first spring is connected to the clutch cable, and the rear end of the second spring is fixed to the fuselage side. , the rear end of the third spring engages with a connecting member connected to the brake rod via a limiter spring, and this connecting member engages with the bracket of the foot brake pedal through an elongated hole; A foot brake device for a riding work machine, characterized in that the elastic force of the limiter spring of the connecting member is set to be stronger than the elastic force of the spring in item 3.