JPH0113661Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention relates to a parking brake device for a small-sized maintenance tractor.

(b) Prior art In the case of large tractors, a locking device is installed to lock the brake pedal in the depressed state to act as a parking brake, or other simple parking brake devices are installed, but in the case of small tractors for maintenance purposes, The parking brake link device is interposed between the link devices leading to the brake pedal type brake device, and the same brake device can also be operated by the parking brake lever.

(c) Problems to be solved by the invention This invention has a structure in which the brake mechanism linked to the parking brake lever is interposed in the intermediate brake of the travel brake mechanism operated by the travel brake pedal, and the brake mechanism is interposed between the fuselage frame and the fuselage frame. A pivot shaft is provided between them, and a parking brake arm is integrally fixed to the traveling brake arm pivoted to the pivot shaft, so that the braking device can be operated either by the traveling brake pedal or by the parking brake lever. It is configured to be operable.

This allows the rotary mower to be attached to the abdomen,
The pivot shaft of the bell crank provided for raising and lowering is also used as the meeting point of the travel brake pedal and the parking brake lever.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

A traveling brake arm 43 connected to the traveling brake pedal 10 by a link 21 and a parking brake arm 43a connected to the parking brake lever 11 by a long hole link 22 are passed between the left and right body frames 2, 2. A rotary mower is integrally supported on a suspended pivot shaft 44, and a bell crank 12 operated by a vertical operation lever 9 is pivoted on the pivot shaft 44, and is attached to the abdomen by the bell crank 12. 5 is suspended and supported.

(E) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is an overall side view of a tractor with a rotary mower attached to its abdomen.

Reference numeral 1 denotes a bonnet, and an engine is housed within the bonnet 1. The engine and the rear transmission case A are fixed inside the fuselage frame 2. The bevel gear box 4 at the front of the engine is linked with a V-belt, and power is transmitted to the rotary mower 5. 3 is a front wheel, 7 is a rear wheel, 6 is a fender, 8 is a seat, and 16 is a steering wheel.

The rotary mower 5 has two diagonal links 1 on the abdomen.
4,15, and a bell crank 12
It is configured so that it can be suspended from a working state to a stored state. The bell crank 12 is operated up and down by a vertical operation lever 9 provided on the second part of the body frame. 10 is a brake pedal, and 11 is a parking brake lever interlocked with the brake pedal.

FIG. 2 is a side view of the front part of the transmission case A, and FIG. 3 is a plan view of the same.

Stopper button 9 at the top of the vertical operation lever 9
A protrudes, and when the stopper button 9a is pressed, the stopper pin 9c moves up and down via the interlocking rod 9b. Vertical position regulation grooves 13a and 13b are carved in the mounting seat 13 of the vertical operation lever 9, and when the vertical operation lever 9 is rotated until the stopper pin 9c is fitted into the vertical position regulation groove 13a, the rotary mower 5 is at the upper limit position. When the stopper pin 9c is rotated in the opposite direction until it enters the vertical position regulating groove 13b, the rotation of the vertical operation lever 9 is regulated and the rotary mower 5 is lowered to the lower limit set by the lower limit adjustment knob 24.

An arm plate 17 is fixed to the tip of the vertical operation lever 9, and a vertical groove for a stopper pin 9c is provided in the arm plate 17.
It is connected to. The lever arm 19 is attached to the pivot shaft 4 along with the bell crank 12 and the traveling brake arm 43.
It is pivoted on 4. The pivot shaft 44 has two left and right
The books are suspended between the fuselage frames 2 and 2.

An engagement protrusion 19a at the upper end of the lever arm 19 is provided to protrude toward the rotation trajectory side of the bell crank 12,
When the vertical operation lever 9 is rotated rearward, it engages with the upper end of the bell crank 12 and rotates the bell crank 12 upward. Front end hole 1 of bell crank 12
A pivot pin 12c is attached to 2a, and is pivotally connected to a hanging link 28 on the side of the rotary mower 5. The rear end hole 12b of the bell crank 12 is pivotally connected when the bell crank 12 is rotated by a hydraulic cylinder.

The lever arm 19 and the bell crank 12 are provided on the right side of the fuselage, and are connected by a pivot tube 25 to a bell crank 12' of approximately the same shape provided on the left side in the direction of movement of the aircraft, and are the same as the bell crank 12 on the right side. It is designed to perform the following movements.

There is a special pin 12d on the left bell crank 12'.
protrudes to restrict the amount of downward movement of the rotary mower 5.

The turning force of the vertical operation lever 9 is the rotary mower 5.
When raising the rotary mower 5, the engagement protrusion of the lever arm 19 acts directly on the bell crank 12, but the force that lowers the rotary mower 5 is due to gravity, and if the lever arm 19 moves back, the rotary mower 5 stops at an intermediate position. It is possible. Also, the stopper pin 9c of the vertical operation lever 9 has the upper limit regulating groove 1.
3a or the lower limit regulation groove 13b.

Therefore, the vertical operation lever 9 retreats to the position of the lower limit regulation groove 13b, so that the bell crank 1
2' can be stopped midway and the rotary mower 5 can be fixed at a midway position. This operation is performed using the lower limit adjustment knob 24.

The structure of the lower limit adjustment knob 24 is shown in FIGS. 5 and 8. The lower limit adjustment knob 24 is fitted into a mounting body protruding from the body frame 2, and has a threaded portion 24a carved at its tip. When the lower limit adjustment knob 24 is turned, the elongated hole plate 42 screwed into the screw portion 24a moves up and down, and the elongated hole 42a of the elongated hole plate 42
Due to the position of the pin 12 fitted into the elongated hole 42a
d, which in turn prevents the rotary mower 5 from moving downward.

In FIG. 5, the tips of the bell cranks 12, 12' are fitted into the long holes with the large diameter part of the hanging link 28, and when removing the rotary mower 5 from the abdomen of the machine, the pivot pin 12c is inserted into the large diameter part of the hanging link 28. It is configured so that the engagement can be removed.

A link 40 is connected to the arm plate 17 in FIG. 5, and the vertical operation arm 9 and the front PTO clutch arranged in front are linked, so that when the rotary mower 5 is lowered, the mower rotates, and when it is raised, the mower rotates. It is configured to stop.

FIG. 4 is a side view showing the support drive mechanism of the rotary mower 5. FIG.

A bevel gear box 4 is provided at the tip of the fuselage frame 2, which is located at the front of the engine inside the bonnet 1, and changes the direction of the rotation transmitted from the front PTO pulley to the pulley 37 by 90 degrees. 39 is a tension pulley for the belt of pulley 37. The V-belt 34 is attached to the pulley 55 at the bottom of the gearbox and the drive pulley 35 of the rotary mower 5.
The belt tension pulley 38 is brought into contact with the belt tension pulley 38.

Rollers 33 and 32 are installed at the bottom of the rotary mower 5.
A tail wheel 31 is provided at the rear, which can also be released by a tail wheel up/down adjustment handle 30.

The front end of the diagonal link 14 is pivotally supported by an arm 27 that can freely rotate back and forth, and the arm 27 is attached to the body frame 2 by a bracket 26. The diagonal link 15 has its rear end attached to the bracket 29 and the machine frame 2 by a pin 51, and its front end attached to the rotary mower 5 via an elongated hole bracket 50.

The hanging link 28 is pivotally connected to a hanging bracket 36 by a pin, and the upper end of the hanging bracket 36 comes into contact with the fuselage frame 2, thereby preventing swinging during hanging storage.

13c is a pivot shaft of the vertical operation lever 9.

The configuration of the brake system will be explained with reference to FIGS. 2 and 3.

By depressing the traveling brake pedal 10, the pedal arm 10a rotates, and via the link 21, the traveling brake arm 43 of the brake link device shown in FIGS. 7 and 9 is rotated. The pivot point of the traveling brake arm 43 utilizes the same pivot shaft 44 as the pivot shaft of the bell crank 12 that raises and lowers the rotary mower 5, and is located between the body frames 2, 2.

In addition, in FIG. 2, if the center of the pivot shaft 44 is the pivot point D, then the pivot point C of the brake cam lever 52 of the brake device B and the traveling brake pedal 1
The pivot point D is provided at a substantially intermediate position between the pivot point E and the pivot point E.

A turnbuckle 23a is provided between the brake cam lever 52 and the parking brake arm 43a.
A link 23 with a mark is provided.

Parking brake lever 11 is shown in FIG. 6 and is pivoted on pin 41d of parking brake lever support 41. Parking brake lever 11 is shown in FIG. The parking brake lever support 41 is fixedly mounted on the body frame 2, and has an engaging protrusion 41a at the front end and a rotation stopper pin 41c at the rear.

A stop button 11a is provided at the tip of the parking brake lever 11, and when the stop button 11a is pressed, the engagement of the engagement piece 11b with the engagement protrusion 41a is released via the link 11c, and rotation of the parking brake lever 11 is stopped. Become free. Engagement piece 11b
An elongated hole link 22 is pivotally connected to a pivotally supported pivot pin 11d, and is pivotally connected to a pin 43b at the tip of a parking brake arm 43a projecting from a traveling brake arm 43 through an elongated hole 22a.

This elongated hole 22a allows the parking brake lever 1
When the parking brake lever 11 is rotated toward the brake side, that is, upward, the traveling brake pedal 10 simultaneously rotates downward, but conversely, even if the traveling brake pedal 10 is depressed while the parking brake lever 11 is rotated toward the release side, that is, downward. The parking brake lever 11 has a structure that does not rotate. Reference numeral 20 denotes a spring for returning the travel brake pedal 10 to the upper position before it was depressed.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, one brake can be used as both a travel brake and a parking brake, making it possible to provide a travel/parking brake device that is inexpensive and operates reliably in a small controlled tractor.

Secondly, in small mower tractors, since the rotary mower 5 is attached to the abdomen, there is no place to place the brake link or arm, or conversely, when the rotary mower 5 is raised, these brake links and , there is a problem that it comes into contact with the arm.

In the present invention, the traveling brake arm 43 of the traveling brake pedal 10 is integrated with the parking brake arm 43a of the parking brake lever 11,
Pivot shaft 4 of bell crank 12 for raising and lowering the work machine
Since the rotary mower 4 is also used for pivoting, the number of pivot shafts is reduced, sufficient space is provided for the vertical movement of the rotary mower 5, and there is no possibility of interference between the two.

Furthermore, by using common parts, it is possible to reduce the number of parts and reduce costs.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the rotary mower attached to the abdomen, Figure 2 is a side view of the vicinity of the tractor's transmission case, Figure 3 is a plan view of the same, and Figure 4 is the rotary mower attached. FIG. 5 is an enlarged side view of the lower limit adjustment knob, FIG. 6A is an enlarged side view of the parking brake lever, FIG. 6B is a rear view, and FIG. 7 is a plan sectional view showing the link of the pivot shaft. , Fig. 8 is a rear sectional view of the lower limit adjustment knob, Fig. 9 is a side view of the travel/parking brake arm, Fig. 10 is a plan view of the bell crank device, Fig. 11 is a right side view, and Fig. The figure is also a left side view, Figure 13 is a side view of the traveling/parking brake arm alone, Figure 14 is a rear view, and Figure 1
Figure 5 is a plan view of the mounting seat 13 of the vertical operation lever 9;
FIG. 16 is a side view, and FIG. 17 is a front view. 2...Aircraft frame, 10...Traveling brake pedal, 11...Parking brake lever, 12...Bell crank, 22...Elongated hole link, 43...Travel brake arm, 43a...Parking brake arm, 44... Pivot axis.

Claims (1)

[Scope of utility model registration request] A traveling brake arm 43 connected to the traveling brake pedal 10 by a link 21 and a parking brake arm 43a connected to the parking brake lever 11 by a long hole link 22 are passed between the left and right fuselage frames 2, 2. A rotary mower is integrally supported on a suspended pivot shaft 44, and a bell crank 12 operated by a vertical operation lever 9 is pivoted on the pivot shaft 44, and is attached to the abdomen by the bell crank 12. 5 is suspended and supported.