JP3312424B2 - Mower lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front mower elevating device, which aims to improve the durability of the mower by reducing the influence of the angle of the universal joint.

[0002]

2. Description of the Related Art A universal unit that transmits rotational power to a front mower.
If the angle of the monkey joint becomes too large, it may generate abnormal noise or damage the joint itself.In order to prevent this, the applicant operates the hydraulic operation lever upward while the universal joint is rotating. In such a case, a mechanism has been proposed to mechanically check the mower deck so that it cannot be lifted too much.

[0003]

In such a conventional apparatus, when the operating lever is operated, the mower deck does not rise significantly. However, the mower deck is not raised by the hydraulic operating lever, but is lifted from the ground. When the mower deck is raised by the reaction force, the check mechanism does not work and the mower deck rises greatly from the ground, and at this time, the universal joint is also rotating, so that a loud sound is generated, and in the worst case the universal -The monkey joint was broken.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and has taken the following technical measures. That is, the first link 40 and the second link 42
In mower lifting device formed by vertically movably supporting the mower deck 65 via a lifting link consisting of, a lifting link as well as configured to be vertically movable pivoted by a hydraulic device 41, motor <br/> Adekki 65 ground From the second phosphorus
Is provided on the first link 40 side when the
The swing angle of the stopper member 48 is changed.
The mower elevating device is characterized in that the upward movement of the elevating link is restricted by the member 48 .

[0005]

Embodiments of the present invention will be described below with reference to the embodiments shown in the drawings. First, the structure will be described.
Is a front-wheel-drive type power vehicle having large-diameter front wheels 2 and 2 and small-diameter rear wheels 3 and 3 and usually running by driving only the front wheels 2 and 2.

The rear wheels 3, 3 are steering wheels, and when the steering handle 4 is turned, the rear wheels 3, 3 are steered by an all-hydraulic steering device (not shown). Reference numeral 7 denotes a steering post provided at the front of the fuselage, 8 denotes a seat, and 9 denotes a step, which is formed integrally with a fender 10 that covers above the front wheels 2 and 2. An engine 12, a fan 13, a radiator 14, a fuel tank 15 and the like are provided at the rear of the body, and a muffler 20 is mounted on the right side of the engine 12 in the traveling direction, and an air cleaner is provided on the left side. A nut 23 is provided. 21 is a tail pipe.

The above-mentioned engine 12, radiator 14,
The fuel tank 15 and the like are covered with a box-shaped bonnet 16. Vent portions 16 a, 16 b,. In addition, although the ventilation part may be comprised by a perforated iron plate, it is good also as a form which stretches a net-like body. The engine 12
A clutch housing 17 accommodating a clutch is mounted at the front of the transmission, and a hydrostatic continuously variable transmission 26 (HST) is provided at the rear of the transmission.

The hydrostatic stepless transmission 26 is housed in a transmission case 27, and the hydrostatic stepless transmission 2
The output shaft 6 is connected to a mechanical transmission (not shown) so that the reduced rotational power is transmitted to the front wheels 2. 1 is a clutch pedal, 31, 31
Is a swing brake pedal. Although not shown, a right side is provided with a traveling pedal for continuously variable transmission and a master brake pedal which simultaneously applies left and right brakes. Reference numeral 34 denotes a hydraulic operation lever, and reference numeral 35 denotes an operation lever for auxiliary speed change.

Next, a mower as a reaper mounted on the front of the machine and its suspension mechanism will be briefly described. At the front of the transmission case 27, first links 40, 40 in the form of square pipes, which are simultaneously rotated left and right by a hydraulic cylinder 41.
Are pivotally supported, and a second end is provided at the distal end of the first link 40.
The links 42, 42 are removably inserted into the second link 4
The pins 2 and 42 are pivotally supported by pins 44 and 44, respectively, so that they can swing up and down within a certain range independently. Left and right first
The links 40 are connected to each other by a pipe 45 as shown in FIG. 3, and long holes 46, 46 are formed in the upper surfaces of the first links 40, 40. From the long holes 46, the cams 48, 48 shaped like a letter in a side view enter and exit, and the cams 48, 48 are connected to each other by a thin pipe 50a.
Is configured. Rear U-shaped locking plates 54, 54 are fixed to the rear ends of the second links 42, 42 (see FIG. 2), and the cams 48 are provided on the inner surfaces of the locking plates 54, 54. , 48 so as to be in contact with each other. Springs 57, 57 are stretched between the upper ends of the cams 48, 48 and the pivot pin 55, and these springs 57, 5
The locking plate 54 of the second link 42 is always in contact with the inner surface of the first link 40 at a tension of 7 (solid line state in FIG. 2).

Therefore, for example, when the second link 42 is turned upward by the force from the ground, the cams 48, 48 are turned around their fulcrums 58, 58 to erect the cams 48, 48. ing. Reference numeral 60 denotes a locking member on the fuselage side. The first link 40 rotates until the stopper 50 hits the locking member 60. Also, the second links 42, 4
A mower deck 65 that covers the outer circumference of the three cutting blades 62 is attached to the tip of 2, and the rear part of the mower deck 65 is suspended by a suspending tool 70 including a suspending rod 66, a retaining pin 67, and a collar 68. Is done. The suspending device 70 regulates the mower deck 65 from hanging more than a certain amount, and allows the mower deck 65 to move upward. Therefore, when the mower deck 65 receives an upward force during the work, the mower deck 65 can be retracted upward.

Reference numeral 72 denotes a gage wheel, 74 denotes a tail wheel attached to the rear of the mower deck 65, and 75 denotes a gear case. The input shaft 80 of the gear case 75 and a PTO shaft (not shown) projecting forward from the front of the transmission case 27 are connected to each other via a universal joint 85, and the PTO shaft rotates. Then, the three mowing blades 62 pivotally supported at appropriate intervals in the left and right directions in the mower deck 65 are configured to be rotationally driven clockwise as viewed from a plane.

A grass discharge port 88 for discharging the cut grass and grass is provided on one side in the left and right direction (the right side in the embodiment) of the mower deck 65, and this grass is used for performing a collector work other than the cut grass work. A shutter (not shown) is connected to the discharge port 88, and the cut grass or grass is collected by a collector placed above the bonnet 16. Next, the operation of the above example will be described. When the rotating power of the engine 12 is transmitted to each rotating part and the aircraft is advanced, the grass and grass are cut off by the rotating cutting blade, and the grass in the mower deck 65 passes through the grass discharge passage 89 of the mower deck 65 and the mower deck. 65 and is discharged from the discharge port 88 on the right side.

During operation, the front of the mower deck 65 is supported by a gage wheel 72, and the rear side of the mower deck 65 is supported slightly away from the ground. It is supported almost parallel. At the time of work, when one side in the left-right direction of the mower deck 65 receives an upward moving force from the ground due to unevenness of the ground, the rod 66 of the suspending device 70 moves upward, and the mower deck 65 is retracted upward. During the mowing work, the hydraulic valve is switched to the lower side and used in a free-float state.
When the mower deck 65 is lifted by operating the hydraulic operation lever 34 to the up side during the operation, the second link 42 is raised while being in contact with the inner surface of the first link 40. In this case, since the cams 48 and 48 are inclined in the state shown by the solid line in FIG. 2, the distance between the stopper 50 and the locking member 60 of the body is large, so that the mower deck 6
5 can be greatly lifted.

On the other hand, during the cutting operation, the hydraulic operating lever
When the lower end of the front end of the mower deck 65 is pushed up by the reaction force of the ground instead of the upward movement operation by 34, the second link 42 rotates upward about the fulcrum pin 44 as shown by an imaginary line in FIG. The locking plate 54 provided at the end is a cam 48
Is rotated counterclockwise to raise the cam 48. Then, the distance from the upper end of the cam 48 to the locking member 60 of the fuselage is reduced, and even if a force is applied to rotate the mower deck 65 upward, the stopper 50 immediately hits the fuselage. From above, the upward movement of the mower deck 65 is prevented.

As a result, even if the universal joint 85 is rotating, the upward rotation of the mower deck 65 is restricted more than necessary. There is no inconvenience such as damage. Next, a partially improved structure of the power vehicle and the mower deck described in the above embodiment will be described with reference to FIGS.

FIGS. 4 to 6 show the structure of the lower part of the ventilation portion of the bonnet 16. FIG. A cooling air inlet 91 is provided below the side plate 90 of the bonnet 16 and is configured to be a cover-removable type. A cover 93 serving as a main body is provided with a rectangular opening 94. A mesh member 95 is detachably attached, and a shielding plate 96 that covers the front surface, the rear surface, and the inner surface, and that is open only on the lower surface, is attached inside the mesh member 95.

When the cover body 93 is mounted on the machine, the upper surface of the cover body 93 is brought into contact with the lower portion of the side plate 90 of the bonnet 16 and the lower end is brought into contact with the machine frame 97. With this configuration, the sound of the cooling fan 13 does not leak out, and dust collected on the lower surface of the cover can be easily swept out by removing the mesh member 95, so that inspection and cleaning can be performed easily and conveniently. It is.

FIG. 7 shows a mounting structure of a hydraulic pump 98 for taking out an external hydraulic pressure. As shown in the figure, a pulley 102 mounted on a shaft 101 driving a fan 13
And a transmission mechanism 105 comprising a pulley 103 provided below this, and a belt 104 wound between the pulleys.
The shaft 108 is rotated through the above-mentioned operation, and the hydraulic pump 98 attached to the shaft end is driven to rotate. The hydraulic pump 98 is provided directly below the radiator 14, and is installed on a box-shaped base 110 having an open upper surface.

The base 110 is formed of a mesh 112 at the bottom, and the entire base 110 is attached so as to surround the machine frame 97. 8 and 9 disclose the structure of the cover-115 covering the upper surface of the mower deck 65. FIG.
The cover-115 is divided into four parts in the horizontal direction as shown in the figure, and grease nipples 117, 117 lubrication holes 118, 118 are provided in the left and right ends of the covers 115a, 115d.
Are drilled.

[0020] Rubber caps 120, 120 are removably attached to the holes 118, 118. As shown, the caps 120, 120 are provided with a cover-1.
For the plate thickness of 15, 115, the caps 120, 120
The width of the grooves 120a, 120a is larger. When the groove 115a is formed to be larger than the plate thickness in this manner, the cap 120 is easily pulled out and pinched, and the handling is easy in a place where the frequency of grease injection is high.

FIGS. 10 and 11 show a mechanism for collecting grass and turf mowing by using the power vehicle 1 and a mower to a traction type collector 125 connected to the rear part of the fuselage.
A shutter is connected to the grass discharge port 88 of the mower deck 65, and grass and grass are sucked by a blower 127 provided on the way. A cylinder 128 is further extended upward from the blower 127 obliquely to the collector. The opening is connected to a bent tube 130 slidably mounted on the upper part of 125.

A traction point is provided immediately below the center of the bent tube 130 so that the entire collector 125 can rotate in a predetermined range in the left and right directions around a vertical pin 132 inserted into the hitch 131. 135 is a frame, 136
Is a caster, 137 is an opening / closing lid attached to the rear of the collector 125, 138 is a rod interposed between the opening / closing lid 137 and the frame 135, and 140 is a member that rotates the collector 125 upward to remove the contents contained therein. Hydraulic cylinder to release-1
Reference numeral 42 denotes a pipe for sending hydraulic oil to the hydraulic cylinder 140, so that oil is sent from a control valve (not shown). In this example, the collector 125 is connected to the fulcrum 143.
The opening / closing lid 137 is configured to open in conjunction therewith when rotated around.

In a so-called front mower in which a mower is mounted on a front part of a power vehicle to perform a mowing operation, it is extremely difficult to connect a collector to a rear part of the body and tow because the rear wheel 3 is a steering wheel. However, with such an improvement, the collector 125 can easily follow the movement of the machine, and the grass above the collector 125 can be taken in without trouble. It is convenient to do.

FIGS. 12 and 13 illustrate a structure in which a wagon 150 other than the collector is connected. The hitch 151 at the rear of the fuselage and the hitch 152 at the front of the wagon 150 are fitted in the front-rear direction, and the pins 153 are inserted to connect and fix them. A steering cylinder-154 for steering the rear wheel 3 and a steering cylinder-155 attached to the lower part of the wagon 150 are connected in parallel to a hydraulic power source, and the wheels 157 of the rear wheel 3 and the wagon 150 are in the same direction. It is configured to cut into pieces.

In the figure, reference numeral 158 denotes a tie rod on the machine side, 15
9 is a tie rod on the wagon 150 side.

[0026]

According to the present invention, as described above, the first
In a mower lifting device that supports the mower deck 65 so as to be able to move up and down via a lifting link composed of a link 40 and a second link 42 , the lifting link is configured to be rotatable up and down by a hydraulic device 41 , and the mower deck 65 Is pushed upward from the ground and the second link 42 is moved upward.
Swing angle of the stopper member 48 provided on the link 40 side
The stopper member 48 changes the degree of lifting
The movement of the mower deck 65 was restricted during operation.
Is pushed up by the reaction force of the ground,
Of the lifting link by the stopper member 48 whose degree has been changed.
The upward motion is restrained, so that there is no problem that the universal joint being rotated is damaged or a loud noise is generated, and the reaping work can be performed satisfactorily.

[Brief description of the drawings]

FIG. 1 is an overall side view of a power vehicle.

FIG. 2 is a side view of a main part.

FIG. 3 is a perspective view of a lifting link.

FIG. 4 is a rear view of a bonnet portion.

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

FIG. 6 is a perspective view of a main part.

FIG. 7 is a side view showing an attached state of a pump for extracting an external hydraulic pressure.

FIG. 8 is a perspective view of a mower deck portion.

FIG. 9 is a front sectional view.

FIG. 10 is a side view of a traction collector.

FIG. 11 is a perspective view thereof.

FIG. 12 is a plan view of a towable wagon.

FIG. 13 is a side view of the towable wagon.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Powered vehicle 2 Front wheel 3 Rear wheel 4 Steering handle 12 Engine 14 Radiator 15 Fuel tank 16 Bonnet 24 Oil cooler 26 Hydraulic continuously variable transmission 27 Transmission case 34 Hydraulic operation lever

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-108310 (JP, A) JP-A-63-28317 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01D 34/64 A01B 63/10

Claims (1)

(57) [Claims] 1. A first link 40 and a second link 4 at the front of the fuselage.
In a mower elevating device that supports the mower deck 65 so as to be able to ascend and descend through an elevating link composed of an elevating link 2 , the elevating link is configured to be rotatable up and down by a hydraulic device 41 ,
The mower deck 65 is pushed upward from the ground and
Provided on the first link 40 side when the link 42 moves up.
Change the swing angle of the stopper member 48
A mower elevating device configured to restrict upward movement of the elevating link by a member 48 .