JPH0796781A - Pedal operating structure of farm working machinery - Google Patents

Abstract

PURPOSE:To shorten a braking distance in reneutralizing a high speed tractor(HST) surely whenever braking force is generated by solving such a state that it is still in drivingness although a braking action is actually performed as its reneutralization is too late for the end at the time of braking operation. CONSTITUTION:A lateral pin 17 is installed in a shift pedal 11 operating a traveling high speed tractor(HST) and a recess-in part 18, where the pin 17 is engageable, in a brake pedal 10 to be contiguously set up left in the shift pedal 11, respectively and the pin 17 and the recess-in part are opposedly set up so as to make this pin 17 engageable with the recess-in part 18 if the shift pedal 11 is in a neutral position N. With this constitution, each inclined guiding part 19, making the pin 17 contact with the recess-in part 18 for guidance so as to have the pin 17 and the recess-in part 18 engaged with each other attending on operation of the brake pedal 10, is formed in front and in the rear of the recess-in part 18, using it as a braking linkage A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling HST (hydrostatic type continuously variable transmission) such as a lawn mower or a garden tractor.
TECHNICAL FIELD The present invention relates to a pedal operation structure of a working machine equipped with a vehicle, and more specifically, to a technique for reasonably shortening a braking distance.

[0002]

2. Description of the Related Art For example, in a lawn mower disclosed in Japanese Utility Model Laid-Open No. 4-123724, a gearshift pedal and a brake pedal for HST operation are provided on the right side of the front part of the floor. The right foot separated from the pedal will be replaced with the brake pedal and the pedal will be depressed.

[0003]

In this case, the speed change pedal is automatically returned to the neutral position by the neutral return due to the structure of the HST itself or the action of the neutral return mechanism provided separately, and the operator is forced to brake. It is designed so that only the ringing operation is performed. However, since the neutral return behavior of the HST is relatively slow, the return speed to the neutral position of the HST is not in time and the braking action is actually performed when the shift pedal is deeply depressed or when the brakes are suddenly applied. Nevertheless, it was possible that it was still in a driving state. An object of the present invention is to make sure that the HST is surely returned to the neutral state when the braking force is generated, so that the braking distance can be further shortened.

[0004]

In order to achieve the above object, the present invention provides a protrusion and a recessed portion into which the protrusion can be inserted, and a shift pedal for operating a traveling HST, and a proximate to the shift pedal. The protrusions and recesses are arranged relative to each other so that the protrusions can engage with the recesses when the speed change pedal is in the neutral position, and the protrusions and recesses are depressed as the brake pedal is depressed. An inclined guide portion for contacting and guiding the projection toward the recessed portion so as to engage with the recessed portion is formed on the pedal provided with the recessed portion of both pedals.

[0005]

According to the above characteristic structure, when the brake pedal is stepped on, the shift pedal is forcibly neutralized. Therefore, when the braking force is actually generated, the driving force can not be applied to the running neutral state. That is, if the gearshift pedal has already returned to the neutral position when the brake pedal is depressed, the protrusion is directly engaged with the recessed portion and the brake pedal is depressed with the gear pedal not fully returned to the neutral position. Then, the speed change pedal is forcibly operated to be neutralized by the guiding action of the projection caused by the contact between the projection and the inclined plan portion being guided to the recessed portion. Therefore, the phenomenon that the traveling driving force acts during braking is eliminated, and the braking distance can be shortened accordingly. Further, the means for producing the above-mentioned action can be constituted by a structure having a simple and small number of parts such that the protrusion and the recessed portion are separately provided to the pedal by utilizing the brake pedal and the shift pedal which are arranged close to each other. it can.

[0006]

As a result, by the simple and cost-effective means utilizing the close arrangement of the pedals, the driving force can be linked so as not to act during braking, and the braking distance preferable in terms of maneuverability can be shortened. We were able to provide what we contribute economically.

[0007]

Embodiments of the present invention will be described below with reference to the drawings when applied to a lawnmower which is an example of a working machine. A mid-mount riding lawn mower is shown in FIG.
Is an engine, 2 is a steering front wheel, 3 is a control section, 4 is a transmission cover, 5 is a driving rear wheel, and 6 is a mower. The steering section 3 includes a steering handle 7, a driving seat 8, a lift lever 9 for adjusting the elevation of the mower 6, a brake pedal 10, and a speed change pedal 11. Further, the floor 12 integrally formed with the fender 13 for the rear wheel 5 is suspended and supported with respect to the vehicle body by a front lateral fulcrum (not shown) and a rear shock absorber 31.

In the transmission cover 4, the HS for the rear wheel 5 is
A mission M with T30 is provided, the upper pulley 14 of the engine output shaft 1a and the input shaft of the HST30 (not shown).
And are transmitted by the running belt 15, and the mower 6
A driving force is input to the belt from the lower pulley 16 of the output shaft 1a.

Next, the brake pedal 10 and the speed change pedal 1
The link structure with 1 will be described. As shown in FIGS. 1 and 2, at a position near the right side of the brake pedal 10 which can be depressed at the fulcrum X, a speed change pedal 11 which is freely swingable by a balance is supported at a fulcrum Y. This transmission pedal 11 is the above-mentioned HST
30 is operated, and when the pedal is stepped forward, a forward state is displayed, and when the pedal is stepped backward, a reverse state is displayed. When the pedal is released, the shift pedal 11 is automatically operated by the action of a neutral return mechanism not shown. It is configured to return to the neutral position N. Needless to say, the traveling speed increases as the depression angle of the transmission pedal 11 increases.

This lawnmower is equipped with a braking linkage mechanism A that forcibly returns the speed change pedal 11 to the neutral position N as the brake pedal 10 is depressed. That is, a lateral pin (corresponding to a protrusion) 17 is attached to the lower portion of the downward extending portion of the transmission pedal 11 with respect to the fulcrum Y, and the pin 1
Brake pedal 1 is provided with a downward recessed portion 18 into which 7 can be engaged.
It is formed on the bending engagement plate 10a attached to the 0 side surface. The pin 17 and the recessed portion 18 are arranged relative to each other so that the pin 17 can engage with the recessed portion 18 when the speed change pedal 10 is at the neutral position N, and the brake pedal 1
An inclined guide portion 19 for guiding the pin 17 into contact with the recessed portion 18 is formed in front of and behind the recessed portion 18 in the engagement plate 10a so that the pin 17 and the recessed portion 18 are engaged with each other when 0 is stepped on. Thus, a braking link mechanism A is configured.

That is, when the brake pedal 10 is depressed in the free state in which the shift pedal 11 is not depressed,
The recessed portion 18 and the pin 17 are just engaged with each other. Therefore, for example, if the brake pedal 10 is stepped on immediately after the foot is released from the speed change pedal 11 that has been pressed to the limit to the forward side, the pin 17 and the rear side of the speed change pedal 11 that is in the middle of returning to the neutral position are The braking force is generated after the shift guide 11 is brought into contact with the inclined guide portion 19 and the transmission pedal 11 is forcibly and rapidly returned to the neutral position. The same applies when the shift pedal 11 is stepped on the reverse side.

As shown in FIGS. 3 and 5, a lock member 21 swingable at a lateral fulcrum Z is supported inside the right side wall 20a of the front panel 20, and only the laterally operated portion 21A at the upper end thereof is supported. Arc notch 22 formed on the right side wall 20a
It is exposed to the outside through. The lower end of the lock member 21 is formed in a stepped shape having a first stopper portion 21a for setting the return position of the brake pedal 10 and a second stopper portion 21b for the parking brake.

That is, the lock member 21 is urged to return in the counterclockwise direction in the drawing by the return spring 23 acting above the fulcrum Z, and normally the operated portion 21A is at the rear end of the circular arc notch 22. And the brake pedal 10
Abutting piece 10b fixed to the left side surface of the
1a is maintained in abutment. And FIG.
First, depress the brake pedal 10 as shown in (a),
Then, as shown in FIG.
By pushing forward, the contact piece 10b and the second stopper portion 21b come into contact with each other to lock the lock member 21 against the return spring 23 and maintain the brake pedal 10 at the stepped position. The state is revealed.

Referring to FIGS. 3 and 4, each pedal 10, 11
The mounting structure of the machine is outlined below.
The speed change pedal shaft 11j is supported by the loop-shaped support member 24 fixed to the upper surface of the inner surface of the body frame F, and the inner hanging plate 25 fixed to the inside thereof and the outer hanging plate 26 fixed to the supporting member 24. A brake pedal shaft 10j is supported across the brake pedal shaft 10j. Further, the outer hanging plate 26 and the outer surface of the body frame F are connected and reinforced by a connecting plate 27. Reference numeral B denotes a limit setting mechanism for setting a limit position where the shift pedal 11 can be stepped back and forth. The lever piece 11r is attached to the shift pedal shaft 11j.
Set bolt 2 mounted on the front and rear walls of the support member 24
It has a contact structure with 8, 28.

Reference numeral C denotes a starting linkage mechanism for enabling the engine to be started only when the brake pedal 10 is stepped on. An operation arm 10c fixed to the brake pedal shaft 10j and an outer hanging plate 26 are provided. It is composed of the attached brake switch 29. That is, when the brake pedal 10 is not stepped on and the brake is not applied, the brake switch 29 is not pressed and the electric system is configured so that the engine cannot be started in that state.

[Other Embodiment] A recessed portion 18 is formed in the transmission pedal 11.
The inclined guide portion 19 and the projection 17 on the brake pedal 10 may constitute a braking linkage mechanism A.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view showing the structure of a braking linkage mechanism.

FIG. 2 is an operation diagram showing an operating state of a parking brake.

FIG. 3 is a front view showing a support structure of each pedal.

FIG. 4 is a plan view showing a support structure of each pedal.

FIG. 5: Side view of a riding lawn mower

[Explanation of symbols]

 10 Brake Pedal 11 Speed Pedal 17 Protrusion 18 Recessed Part 19 Inclination Guide Part 30 HST

Claims (1)

[Claims] 1. A projection (17) and a recess (18) into which the projection (17) can be fitted are arranged close to a speed change pedal (11) for operating a traveling HST (30) and the speed change pedal (11). When the transmission pedal (11) is in the neutral position, the projection (17) is distributed to the brake pedal (10).
Such that the protrusion (17) and the recessed portion (18) are arranged relative to each other so that the protrusion (17) can be engaged with the recessed portion (18), and when the brake pedal (10) is depressed, To engage with the recess (18),
An inclined guide portion (19) that guides the protrusion (17) toward the recessed portion (18) is provided on both pedals (1).
A pedal operating structure for a working machine, which is formed on a pedal (11 or 10) provided with the recessed portion (18) of 1) and 10).