JPH06113645A - Mower suspension - Google Patents

Abstract

PURPOSE:To provide a mower suspension equipped on a powered vehicle, designed to facilitate the cutting height regulation for the mower. CONSTITUTION:This suspension is equipped with (A) a link 23 connecting a mower deck 26 so as to be free to make vertical motion and (B) a device to suspendedly support the rear of the mower deck 26. The device B is made up of (1) a rod 45, (2) a receiving frame 42 fitted to the link 23 and (3) a controlling material 46 pivoted on the rod 45, the controlling material 46 taking a form of polygon whose corners differ in the distance from the revolving center from one another.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower suspension device for cutting grass and weeds.

[0002]

2. Description of the Related Art Conventionally, as this type of apparatus, for example, one described in Japanese Patent Laid-Open No. 62-181706 is known. The mower deck in this conventional device is rotatably pivotally attached to the front ends of a pair of left and right connecting links projecting forward from the front of the machine body, and the rear part of the mower deck is suspended from the middle portion of the connecting link. It is supported by a lowering rod. Then, the upper portion of the rod is inserted into the receiving frame fixed to the side of the connecting link, and the hair pin is inserted into the upper portion of the rod so that the rod does not fall out.

[0003]

When performing lawnmower work using such a conventional device, the gage wheel fixed to the front portion of the mower deck is normally grounded and the rear portion of the mower deck is slightly lifted. In this case, the hairpin on the suspension rod side will be overloaded with excessive mower weight, and if the mower deck receives vibration from the aircraft or impact from the ground while traveling, this The suspension rod moves largely in the vertical direction, and as a result, the hairpin bends. When the hairpin is bent in this manner, there is a drawback that it becomes difficult to insert and remove the hairpin when adjusting the height of the rear portion of the mower deck.

[0004]

The present invention has been proposed in view of the above problems, and the following technical means have been taken. That is, the connection link 23 is rotatably pivotally supported on the front portion of the power vehicle 1, and the front end portion of the connection link 23 is attached to the front portion of the power vehicle 1.
A working machine 26 located at the front part of the vehicle for performing work while following the ground is rotatably and pivotally supported, and the working machine 26 is suspended from the middle of the connecting link 23 via a pair of left and right suspension devices 40. In the suspension of mowers supported by the above, the suspension device 40 is provided with a rod 45 having a plurality of through holes.
A receiving frame 42 that is attached to the outside of the connecting link 23 and that inserts the rod 45; and a polygonal restricting tool 46 that is pivotally attached to a horizontal shaft 48 of the rod 45 and that has a different distance from the center of rotation. The mower suspension device is constructed by abutting the lower surface of the restrictor 46 against the upper surface of the receiving frame 42 to suspend and support the rear part of the mower.

[0005]

Embodiments of the present invention will be described below based on the embodiments shown in the drawings. First, the structure will be explained as follows.
Is a front wheel drive type power vehicle that has large diameter front wheels 2 and 2 and small diameter rear wheels 3 and 3 and normally drives by driving only the front wheels 2 and 2.

The rear wheels 3 and 3 are steering wheels, and when the steering handle 4 is rotated, the rear wheels 3 and 3 are steered. 5 is a steering post provided at the front of the machine, 6
Is a seat, and 7 is a step, and is integrally formed with a fender 8 which covers the front wheels 2 and 2. An engine 9 is provided at the rear of the machine body, and a fan 10 and a radiator 12 are provided behind it. A fuel tank 14 is provided in the front part of the engine 9, and behind the fuel tank 14,
A muffler 16 is provided above the engine 9.

Vents 19 and 20 through which air can flow are formed at the front and rear of a box-shaped bonnet 18 that covers the fuel tank 14, engine 9, radiator 12, etc., and the fan 10 rotates. Then, the outside air is taken into the bonnet 18 and is exhausted rearward from the rear ventilation part 20. Next, the structure of the mower suspension mechanism mounted on the front of the machine body will be described. The second links 22, 2 are attached to the hollow tip end portions of the first links 21, 21 which are pivotally supported at the lower part of the step 7 and rotate up and down integrally on the left and right.
2 is inserted, and a connecting link 23 for connecting the working machine is formed therein. The second links 22 and 22 are rotatably supported by pins 24 and 24 so that the left and right sides can independently swing up and down by a predetermined angle. A mower deck 26 is removably supported by pins 27, 27 at the tips of the second links 22, 22.

In the mower deck 26, there are three rotary shafts 28,
28, 28 are pivotally supported, and the cutting blades 30, 30, 30 are attached to the lower portions of the rotary shafts 28, 28, 28.
32 is a gear box fixed to the upper surface of the mower deck 26; 33 is an input shaft pivotally supported by the gear box 32;
Is a universal joint for connecting the input shaft 33 and the vehicle-side PTO shaft 35, and 38 is the first links 21, 21.
It is a hydraulic cylinder provided in the lower part of the machine body for moving up and down. Reference numerals 40 and 40 denote suspending mechanisms for supporting the rear portion of the mower deck 26.
40 is a suspension rod having a plurality of through holes 45, 45
And plates 42, 42 as receiving frames attached to the intermediate lateral sides of the second links 22, 22, and restraining members 46 for preventing the suspension rods 45, 45 from falling off. The restricting tool 46 is formed in a polygonal shape (hexagonal shape in this embodiment) having a different distance from the center of rotation when viewed from the side, and is pivotally supported about a pin 48 inserted into the rod 45. The spring 49 is configured to be always attracted inward. An arcuate locking portion 50 with which the outer peripheral edge of the rod 45 can be engaged is provided on each side of the restrictor 46. A pin 52 is integrally fixed to the plate 42, and the pin 52 is pivotally attached to the second link 22.

When changing the suspension height of the rear portion of the mower deck 26, the restricting tool 46 is appropriately rotated so that the distance from the upper surface of the plate 42 to the center of rotation of the restricting tool 46 is changed. In the figure, reference numeral 54 is a gauge wheel of the mower deck 26, and 55 is a lobe attached to the rear portion of the mower deck 26.
La and 57 are links connecting the mower deck 26 and the mission case 58, and a long hole 59 is formed on one side of the link 57. The pin 60 on the side of the transmission case 58 is fitted into this long hole 59. When the mower deck 26 is in the working posture, the pin 60 is located in the elongated hole 59, and the working oil is sent to the hydraulic cylinder-38 to feed the mower deck 2
When 6 is raised, this link 57 is stretched to greatly raise the rear portion of the mower deck 26.

Next, the operation will be described. In the above embodiment, when adjusting the height of the rear portion of the mower deck 26,
First, hydraulic fluid is sent to the hydraulic cylinder 38 to float the mower deck 26, and then the gauge wheel 5 of the mower deck 26 is moved.
Adjust the vertical position of 4, then change the height of the rear part of the mower deck 26. In this case, since the link 57 that raises the rear portion of the mower deck 26 is interposed between the rear portion of the mower deck 26 and the mission case 58, the suspension rod 45 protrudes largely upward from the plate 42. Since the mower deck 26 is not weighted by the restraint tool 46, the rotation of the restraint tool 46 can be easily adjusted.

For the adjustment, the operator grips the restrictor 46 and pulls it out sideways while resisting the elastic force of the spring 49, and the restrictor 4
Release the engagement between the locking portion 50 of 6 and the outer peripheral edge of the rod 45,
This is rotated while maintaining that state. Spring 4
If the elastic force of 9 is weakened, the locking portion 50 and the rod 45 are disengaged simply by rotating the restricting tool 46. As described above, in this embodiment, when the cutting height is adjusted, the position of the gage wheel 54 on the front side of the mower deck 26 is adjusted, and then the hexagonal restrictor 46 is simply rotated to cut the entire mower deck 26. Height adjustment can be performed. Since it is not necessary to remove the hairpin from the upper portion of the rod as in the conventional case, the operation is simple and the hairpin itself is not required, so that the problem of bending the hairpin unlike in the conventional case is eliminated.

Next, a partially improved example of the riding lawn mower will be described with reference to FIGS. 6 to 10. FIG. 6 shows a pedal support structure. The power vehicle 1 has a mission case 5
8 is equipped with a hydrostatic stepless transmission (HST),
A forward pedal 62 and a reverse pedal 64 for operating the hydrostatic continuously variable transmission are rotatably fitted on a shaft 65 at the right front part of step 7.

Reference numeral 66 is a brake pedal, which is fixed to a cylindrical boss 68 loosely fitted on a shaft 67. Further, another cylindrical boss 70 is loosely fitted on the outer side of the boss 7.
Before and after 0, two plates 72 and 74 are fixed with their phases shifted by 180 degrees. The front plate 72 and the forward pedal 62, and the rear plate 74 and the reverse pedal 6
Rods 76 and 77 are respectively interposed between the shafts 4 and 4. A trunnion arm 80 is provided on the inner side of the cylindrical boss 70.
Is fixed, and a trunnion rod 82 that is interlocked with the trunnion shaft of the hydrostatic continuously variable transmission is connected to the upper end portion thereof.

Therefore, when the forward pedal 62 is depressed, the rod 7
6, the trunnion rod 82 is moved forward through the cylindrical boss 70, the plate 72, and the trunnion arm 80 to advance the machine body. Conversely, when the reverse pedal 64 is depressed, the trunnion rod 82 moves rearward. And the interlocking structure is configured so that the aircraft moves backward. Reference numeral 84 denotes an engaging member fixed to the side of the trunnion arm 80, which is bent in a crank shape when viewed from the front and has a locking recess 85 at the upper end.

A plate 86 which can be fitted and locked in the engaging recess 85 is provided beside the brake pedal 66, and a plate 87 is fixed inwardly above the plate 86.
A serrated engagement portion 92 of a parking brake lever 90 is fitted into and engaged with the plate 87. Reference numeral 94 is a spring that holds the fitted and locked state. The brake pedal 66 is depressed to move the plate 86 into the recess 8 of the trunnion arm 80.
5 and then the brake pedal 66 is fixed by the parking brake lever 90, the machine is kept in a stopped state, and at this time, the operator mistakenly operates the forward pedal 6
2 or the reverse pedal 64 is depressed, the aircraft will not start,
It's safe.

In particular, in the above-described structure, since the engaging members are centrally provided on the front portion of the machine body, inspection and maintenance can be facilitated and stable performance can be exhibited. FIG. 7 shows the more deck 26.
3 is a view showing a lock device of a hydraulic cylinder for raising the pressure. A pin 94 is fixedly provided at the tip of the piston rod 38a, and a lock plate 96 having an arc-shaped elongated hole 95 is loosely fitted therein, and the end of the lock plate 96 is brought into sliding contact with the outer wall of the hydraulic cylinder 38. It is in the form. 9
Reference numeral 7 denotes a spring interposed between a pin 98 fixed to the machine body and a lock plate 96, and urges the lock plate 96 to always rotate clockwise in the figure.

When the movement of the hydraulic cylinder 38 is locked, the operator descends from the power vehicle 1 and grips the lock plate 96, and as shown by the phantom line, the lock plate 9
The end of 6 is locked to the end of the hydraulic cylinder-38. With such a configuration, it is possible to easily obtain the lock mechanism of the hydraulic cylinder-38 with a small number of parts.

8 to 10 illustrate the guard portion that covers the universal joint 34 portion.
This guard 100 is at the front of step 7 and has a fulcrum 10
It is provided so that it can be folded and stored centering around 1. The width of the guard 100 is wide enough to cover the gear box 32 above the mower deck 26, the universal joint 34, a transmission belt (not shown), etc., not only to prevent human limbs from entering the rotating part. , Gearbox 32, universal
It has a function of preventing noise generated from the monkey joint 34 and the like.

In the figure, reference numeral 102 is a cushion rubber attached to the end portion of the guard 100, and 104 is a stopper fixed so as to project from the both ends of the step 7 to the left and right outside, and receives the cushion rubber 102. Reference numeral 105 denotes a holding pin provided at the front end of the guard 100 for storage.
Reference numeral 106 denotes a locking hole provided on the front surface of the steering post 5 into which the holding pin 105 is fitted. When the mower deck 26 is detached from the power vehicle and used by the power vehicle 1 alone, the guard 100 is rotated upward as shown by the phantom line in FIG. 10 and folded to the steering post 5 side to maintain the stored state. To do.

The guard 100 also has an auxiliary step-like function and is capable of getting on and off.
Instead of this, the step 7 and the mower deck 26 may be connected by a cloth or rubber protective cover so that the sound and dust on the mower deck 26 side do not come out.

[0021]

As described above, according to the present invention, the connecting link is rotatably supported on the front portion of the power vehicle, and the front end portion of the connecting link is located at the front portion of the power vehicle while following the ground. A mower suspension system in which a working machine for working is pivotally supported so as to suspend the working machine from the middle of a connecting link via a pair of left and right suspension systems. , A rod having a plurality of through holes, a receiving frame attached to the outside of the connecting link for inserting the rod, and a polygonal regulation rotatably pivoted on the horizontal axis of the rod and having different distances from the rotation center Since the mower suspension device comprises a tool and the lower surface of the restrictor is brought into contact with the upper surface of the receiving frame to suspend and support the rear part of the mower, the mower suspension device is inserted into the rod when adjusting the cutting height of the mower. Troublesome things like pulling out hairpins Operation adjustment work becomes quickly become unnecessary. In addition, since the problem of bending the hairpin is eliminated, the operability is remarkably improved.

[Brief description of drawings]

FIG. 1 is a side view of a riding lawn mower.

FIG. 2 is an enlarged side view of a riding lawn mower, a part of which is not shown.

FIG. 3 is an enlarged side view of a main part.

FIG. 4 is a plan view of a main part.

FIG. 5 is a perspective view of a main part.

FIG. 6 is a perspective view of a partially improved device.

FIG. 7 is a side view of a lock device for a hydraulic cylinder.

FIG. 8 is a perspective view of a guard portion.

FIG. 9 is an enlarged side view of a main part.

FIG. 10 is an enlarged side sectional view of a main part.

[Explanation of symbols]

 1 Moving Vehicle 2 Front Wheel 3 Rear Wheel 6 Seat 21 First Link 22 Second Link 23 Connection Link 26 More Deck 32 Gear Box 40 Suspension Mechanism 42 Receiving Frame (Plate) 45 Suspension Rod 46 Restrictor 48 Horizontal Axis (Pin)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Yano No. 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] Claim: What is claimed is: 1. A connecting link is rotatably supported by a front part of a power vehicle, and a front end part of the connecting link is provided with a working machine located at the front part of the power vehicle for performing work while following the ground. A mower suspension device that is rotatably pivotally supported and that suspends a working machine from the middle of a connecting link via a pair of left and right suspension devices, wherein the suspension device has a plurality of through holes. A rod, a receiving frame that is attached to the outside of the connecting link and that inserts the rod, and a polygonal restrictor that is pivotally attached to the horizontal axis of the rod and that has a different distance from the center of rotation. A mower suspension device in which the lower surface of the restrainer is brought into contact with the upper surface of the receiving frame to suspend and support the rear portion of the mower.