JPH09240445A - Brake operating configuration for lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of an unstable running condition caused by one side braking when the mower is traveling while being lifted up. SOLUTION: A brake pedal 15 for braking a left front wheel, a right brake pedal 16 for braking a right front wheel, a main brake pedal capable of simultaneously braking the right and left front wheels, and a mower capable of being elevated, are provided in this place. When an elevating link mechanism C for elevating the mower is moved to an ascending evacuation position, a left elevating link 33 is brought into contact with the rod portions of the right and left brake pedals 15 and 16 so as to allow further more footing to be prevented, and when the elevating link mechanism C is moved to a descending action position, the left elevating link 33 is positioned out of the footing movement locus of each of the right and left brake pedals 15 and 16, and one side brake operation for the right and left brake pedals can therby be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake operating structure of a lawn mower, and more particularly to a technique for improving maneuverability during brake operation.

[0002]

2. Description of the Related Art In Japanese Patent Application No. 6-274668 filed previously, a left and right brake pedals for independently braking left and right driving front wheels, and a main brake for simultaneously operating the left and right brakes A front mount type lawnmower in which three brake pedals are arranged has been proposed.

[0003]

That is, the main brake pedal is depressed while the small turn such as mowing around the grove during lawn mowing work can be performed by one-brake turning by depressing only one of the left and right brake pedals. This is a convenient way to perform good braking during traveling by using both left and right wheel braking. However, since the mower is lifted and the center of gravity is high during traveling, it is conceivable that if the one-brake operation is performed in that state, the aircraft will sway and it will be difficult to control.
Also, when turning one brake during lawn mowing work,
If the brakes were applied strongly to make a small turn, the wheels could lock and slip, possibly damaging the grass. A first object of the present invention is to eliminate an unstable traveling state due to one brake when traveling with the mower raised. The second purpose is to avoid damage to the lawn caused by one-sided brake lock during work traveling.

[0004]

[Means for Solving the Problems]

[Structure] A first invention is a left brake pedal dedicated to left drive wheel braking, and a right brake pedal dedicated to right drive wheel braking,
A main brake pedal that can simultaneously brake the left and right drive wheels, a mower that can move up and down, a restraining member that can be switched between a restraining position that makes it impossible to depress either the left and right brake pedals, and a release position that allows any depressing. And
It is characterized in that the check member is linked so as to be operated to the check position as the mower moves to the ascending and retracting position.

A second invention is that the check member in the first invention is constituted by a link member for lifting and lowering the mower.

A third invention is provided with a left brake pedal for braking the left drive wheel, a right brake pedal for braking the right drive wheel, and a main brake pedal capable of simultaneously braking the left and right drive wheels. It is characterized in that the maximum pedaling amount of each of the pedals is set in a range in which braking lock of the left and right driving wheels does not occur.

A fourth aspect of the present invention is that a diff lock pedal is provided for the left and right drive wheels, and the left and right brake pedals are pivotally supported in parallel with the fulcrum shaft of the diff lock pedal.

[Operation] According to the structure of claim 1, since the left and right brake pedals, which are for one-sided brake expression, are linked so that they cannot be depressed by operating the mower to the ascending and retracting position, A) When driving with a moor such as running on a paved road to a work place or moving on a lawn, the left or right brake pedal operation is blocked or restrained regardless of the intention of the operator, and the one-sided brake state is I will not get up.

According to the second aspect of the present invention, since the lift arm for raising and lowering the mower can also serve as the restraining member and the number of parts can be reduced, the above-mentioned action (a) can be achieved while making it inexpensive and compact.
Will be able to demonstrate.

According to the third aspect of the present invention, the drive wheels are not locked even when the left or right brake pedal is strongly depressed, so that the brake-locked wheels are dragged during a small turn in lawn mowing work to damage the lawn. The phenomenon of, will not occur.

According to the structure of claim 4, since the left and right brake pedals and the diff lock pedal can be pivotally supported by one shaft, the shafts can be used in common to achieve a low cost and a compact structure.

[Effect] In the brake operating structure according to the first aspect, (a) the one-side braking in the relatively unstable state in which the mower is raised is prevented from occurring, and the wobbling during traveling due to it is prevented. It was resolved and it became easier to control.

In the brake operating structure according to claim 2,
(B) There is an advantage that the above effects can be obtained economically and rationally.

In the brake operating structure according to claim 3,
(C) Since the wheel lock does not occur even if the one-brake operation is performed, the damage to the lawn is eliminated, and the finish of the lawn mowing work is improved.

In the brake operating structure according to claim 4,
There is an advantage that the above effects (a) to (c) can be obtained while the structure is small and inexpensive.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a front mount type lawn mower, 1 is a mower, 2 is a body frame, 3
Is a driving front wheel, 4 is a steering rear wheel, 5 is a control section, 6 is an engine, 7 is a mission case, 8 is a driving seat, 9 is a step floor, 10 is a speed change pedal, 11 is a main brake pedal, and 12 is a vehicle for running. It is an HST (hydrostatic type continuously variable transmission).

The power from the engine 6 is input through the HST 12 to the mission case 7, where the left and right front wheels 3, 3 are provided.
Left and right brake pedals 1 arranged in parallel on the left side of the control tower 14 on the step floor 9 while the independent brake devices 13 and 13 are installed respectively (see FIGS. 6 and 9).
The left and right brake devices 13 can be operated separately by operating 5 and 16. As a result, brake turning can be performed by braking only the front wheel 3 on the inside of the turn.
Further, between the right brake pedal 16 and the control tower 14, a diff lock pedal 19 interlocked with a diff lock device 17 installed in the mission case 7 by a rod 18 is arranged.

On the other hand, as shown in FIG. 3, on the right side of the control tower 14, a main brake pedal 11 for simultaneously operating the left and right brake devices 13, 13 and a speed change pedal 10 for operating the HST 12 are provided. . As shown in FIG.
The operated arm 12b attached to the 12 trunnion shaft 12a and the speed change pedal 10 are interlockingly connected by the rod 20, and the cam plate 23 integrally attached to the trunnion shaft 12a and the spring 21 pull and urge the spring. A known neutral return mechanism A is configured by the return arm 22. Then, if the speed change pedal 10 of the balance arm structure is depressed to the front side, it moves forward, if it depresses to the rear side, it moves backward, and if the depression is released, the neutral return mechanism A automatically returns to the neutral state.

Next, the operation structure of the brake will be described. As shown in FIG. 3 to FIG. 9, the intermediate shaft 24 facing left and right in front of the mission case 7 and on the back side of the step floor.
Is installed, and the left relay arm 25 located at the left end of the shaft 24 and the right relay arm 26 having a right cylinder shaft portion 26a that is long in the left and right are externally fitted and supported, and the left relay arm 25 includes the left front rod 27 and the left front rod 27. The left brake pedal 15 and the left brake device 13 are interlockingly connected by the rear rod 28. The right relay arm 26 connects the right brake pedal 16 and the right brake device 13 by interlocking with the right front rod 29 and the right rear rod 30. As described above, the left and right brake devices 13 can be operated separately.

The above-mentioned intermediate shaft 24 is pivotally supported with respect to the machine body, and the operating arm 31 attached to the shaft 24 and the main brake pedal 11 are interlockingly connected by the rod 32, and the intermediate shaft 24 is planted in the intermediate shaft 24. Upright pins 24a, 24a
To the left cylinder shaft portion 25a and the right cylinder shaft portion 2 of the left relay arm 25.
It is fitted into circumferential elongated holes 25b and 26b formed in 6a. In a free state in which the pedals 15, 16 and 11 are not depressed, the pins 24a and 24a are attached to the elongated holes 25b and
26b, the left and right brake devices 13, 13 can be simultaneously braked by depressing the main brake pedal 11, and the left and right brake devices 13, 13 by the left and right brake pedals 15, 16 are arranged. It is possible to brake each separately.
The operation arm 31 is the rod 3 on the main brake pedal side.
It has a two-arm structure for two and for a rod 48 on the cruise control device B side described later.

Next, the elevating structure of the mower 1 will be described. As shown in FIGS. 1, 2 and 6, the left and right lifting links 33, 34 are driven between the front part of the mission case 7 and the mower housing 1H, and are driven by the hydraulic cylinder 35 installed in the upper part of the mission case 7. Lift arm 3
6 are provided respectively, and a connecting link 47 for interlockingly connecting the elevating links 33, 34 and the lift arm 36 is provided to constitute an elevating link mechanism C. That is, when lawn mowing work is performed, the lift arm 36 is swung downward to lower the mower 1 to a lowering work position where the grounding wheel 1b is in contact with the ground, and when moving, the lift arm 36 is swung upward to move the mower 1. Is lifted to the ascending and retracted position where it has been levitated above the ground.

Then, as shown in FIGS. 6 and 7, when the mower 1 is raised to the ascending / retracting position, the left ascent / descent link (link member of the link member is provided just below the rod portions 15a, 16a of the left and right brake pedals 15, 16). One example) 33 is arranged so that it is positioned relative to each other, and in this non-working state, a one-brake restraint mechanism D is configured to restrain restraint so that the left and right brake levers 15 and 16 cannot be depressed. That is, the left lifting link 33 itself corresponds to "a restraining member K that can be switched between a restraining position that disables depression of the left and right brake pedals 15 and 16 and a release position that allows depression. By the way, as shown in FIGS. 7 and 8, the left and right brake pedals 15 and 16 have a coaxial structure in which they are fitted and supported by a fulcrum shaft 19j for the differential lock pedal 19, so that the cost can be reduced by sharing the parts. .

Further, the brake device 13 is set to be in a so-called half-brake state even when the left and right brake levers 15 and 16 are fully depressed so that the braking lock does not occur during one-side braking. That is, as shown in FIGS. 7 and 8, the rod portion 1 of the left and right brake pedals 15 and 16 is
Stopper pins 15p and 16p are provided so as to project from 5a and 16a, and the stopper pins 15p and 16p come into contact with the upper surface of the step floor 9 as the pedal is stepped on, thereby restricting stepping. In this case, the left and right brake pedals 15 and 1 of the stopper pins 15p and 16p
It is convenient to adjust the position with respect to 6 or the height of the stopper pin contact surface of the step floor 9 so that the maximum stepping margin and the half braking force can be adjusted.

The above-mentioned left and right front rods 27, 29 are engaged with the long holes formed on the arm portions of the left and right relay arms 25, 26, and in the free state, they are left and right front at the foremost end positions of the long holes. It is set so that the rods 27 and 29 are located (see FIG. 4). That is, the left and right front rods 27, 29
Since the main brake pedal 11 moves together with the depression of the main brake pedal 11, the long hole connection structure prevents the left and right brake pedals 15 and 16 from being locked by the brake, but the brake lock by the depression of the main brake pedal 11 is prevented. It is possible. The front left and right rods 27 and 29 are equipped with turnbuckles 27a and 29a, respectively.
By the adjustment, the braking force can be adjusted when the left and right brake pedals 15 and 16 are fully depressed.

As shown in FIG. 9, a cruise control device B that acts on the HST 12 to keep the traveling speed at a set value is provided above the mission case. This device B includes a cruise lever 37, a biasing mechanism 38 capable of holding the lever 37 at an arbitrary operation position, an interlocking rod 39 capable of interlocking the cruise lever 37 and the operated arm 12b, and a biasing mechanism 38. And a release arm 40 capable of canceling the action.

As shown in FIG. 10, the urging mechanism 38 includes a pressing cam 41, a receiving cam 42, and both cams 41,
It includes a support shaft 43 to which 42 is fitted, a winding spring 44 that presses the pressing cam 41, and the release arm 40 described above. The pair of friction rings 45, 45 mounted between the cams 41, 42 can press and hold the plate lever portion 37a, which is the base of the cruise lever 37, and straddle the contact portions of the both 41, 42. Thus, the riding cam mechanism 46 is configured.

That is, the winding spring 44 is usually the pressing cam 4.
By pushing 1 in the axial direction, the cruise lever 37 is pressed and held by the cams 41 and 42 at the operation position at that time, and the release arm 40 is swung to move the ride-on cam mechanism 46 to run up, and Both cams 41, 42 move relatively away from each other against the biasing force of the spring 44, and the pressure contact holding action is released. The release arm 40 is interlocked with the operation arm 31 of the intermediate shaft 24 by the rod 48, and the pressing contact holding action of the cruise lever 37 is released as the main brake pedal 11 is depressed.

Further, the interlocking rod 39 on the HST 12 side is engaged with the tip of the rod portion 37b of the cruise lever 37 via the long hole 39b of the plate member 39a fixed to the front end thereof, so that the HST 12 is in the neutral state. Yes, and the cruise lever 37 is in the non-acting position (OFF
(Position), the rod portion 37b has the long hole 39
It is set to be located in the middle of the front and rear of b. In other words, the setting speed maintaining action of the cruise lever 37 acts only when moving forward, and does not interfere with the cruise lever 37 when moving the backward movement of the speed change pedal 10 in which the interlocking rod 39 moves backward.

However, when the cruise lever 37 is swung forward from the OFF position in order to perform lawn mowing work and traveling traveling at a constant speed, only the cruise lever 37 moves to the cruise start position ON due to the play of the long hole 39b. If the cruise lever 37 is swung forward, the long hole 39
After the play of b is completed, the interlocking rod 39 is moved, and HST1
When the cruise lever 37 is released, the cruise control device B operates and the cruise lever 37 is held at the operating position.
When the main brake pedal 11 is depressed in the cruise running state, the release arm 40 is operated to release the pressure contact holding action, the HST 12 returns to the neutral position, and the cruise lever 3 is returned by the return spring (not shown).
7 also returns to the OFF position.

By the way, the cruise release accompanying the simultaneous operation of the brake devices 13, 13 is set to be performed by so-called "play allowance" until the brake is actually actuated as the main brake pedal 11 is depressed. ing.

[Other Embodiment] For example, the lift arm 36.
Rises to move forward and upward to prevent the left and right brake pedals 15 and 16 from being depressed, and lowers the lift arm 36 to move backward and downward to allow the left and right brake pedals 15 and 16 to be depressed. And the check member K that is linked via a link mechanism,
It may be configured separately from the elevating link 33.

Further, a structure is conceivable in which the rod portions 15a and 16a of the brake pedals 15 and 16 which are in the middle of depression are brought into contact with the arm member projecting from the step floor 9 to prevent the braking lock during one-side braking operation. To be

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of drawings]

[Figure 1] Left side view of front mount lawn mower

[Figure 2] Right side view of front mount lawn mower

FIG. 3 is a plan view of a control unit showing an arrangement structure of various pedals.

FIG. 4 is a mechanism diagram showing the structure of a brake operation system.

FIG. 5 is a sectional view showing an interlocking portion between the intermediate shaft and the left and right relay arms.

FIG. 6 is a side view showing the relationship between the left and right brake pedals and the lifting link.

FIG. 7 is a plan view showing the relationship between the left and right brake pedals and the lifting link.

FIG. 8 is a front view showing the relationship between the left and right brake pedals and the diff lock pedal.

FIG. 9 is a right side view showing the shift operation structure and the operation structure of the main brake pedal.

FIG. 10 is a cross-sectional view of essential parts showing the structure of the cruise control device.

[Explanation of symbols]

 1 mower 3 driving wheel 11 main brake pedal 15 left brake pedal 16 right brake pedal 19 diff lock pedal 19j fulcrum shaft 33 link member K restraining member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Nakajo, 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Plant Co., Ltd. (72) Yoshihiro Kawahara, 64, Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. Inside the factory

Claims (4)

[Claims] 1. A left brake pedal (15) for braking the left drive wheel (3), a right brake pedal (16) for braking the right drive wheel (3), and the left and right drive wheels (3), (3). ) Simultaneous braking of the main brake pedal (11) and lifting mower (1)
And the left and right brake pedals (15) and (16) can be switched between a restraining position that disables both pedals and a release position that allows both the left and right brake pedals (15) and (16) to pedal. And a check member (K), which are linked so that the check member (K) is operated to the check position as the mower (1) moves to the ascending and retracting position. . 2. The lawn mower brake operating structure according to claim 1, wherein the check member (K) is composed of a link member (33) for lifting and lowering the mower (1). 3. A left brake pedal (15) for braking the left drive wheel (3), a right brake pedal (16) for braking the right drive wheel (3), and both drive wheels (3), (3). And a main brake pedal (11) capable of simultaneously braking the left and right drive wheels (3) and (3) for the maximum lock amount of the left and right brake pedals (15) and (16). The lawn mower brake operation structure is set within the range that does not occur. 4. A diff lock pedal (19) is provided for the left and right drive wheels (3), and a fulcrum shaft (19j) of the diff lock pedal (19) is provided with the left and right brake pedals (15), The brake operating structure for a lawn mower according to any one of claims 1 to 3, wherein (16) are pivotally supported in a side-by-side arrangement.