JP3166337B2 - Mower suspension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as this kind of apparatus, for example, an apparatus described in Japanese Patent Application Laid-Open No. 62-181706 is known. The mower deck in this conventional device is rotatably connected to the front ends of a pair of left and right connecting links protruding forward from the front of the fuselage, and the rear part of the mower deck is inserted through an intermediate portion of the connecting links. It is supported by a drop rod. FIG. 5 is a simplified version of the one described in this publication, in which a plate-shaped collar member d is inserted into a rod b inserted into a receiving member c on the connecting link a side, and a hair is inserted on the upper part thereof. The structure is such that the rod e does not fall down when the pin e is inserted.

[0003]

When a lawn mowing operation is performed using such a conventional apparatus, the gage wheel fixed to the front of the mower deck is normally grounded, and the rear of the mower deck is slightly lifted. In this case, an excessive load is applied to the hairpin on the hanging rod side, and if the mower deck receives vibration from the body or impact from the ground during traveling, the suspension may be suspended. The rod moves greatly in the vertical direction, and as a result, a problem occurs in that the hair pin is bent. When the hair pin is bent in this manner, it becomes difficult to remove and insert the hair pin when adjusting the height of the rear portion of the mower deck. There was a disadvantage of becoming.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and has taken the following technical measures. In other words, the connecting link is pivotally supported at the front of the power vehicle so as to be rotatable, and at the front end of the connecting link, the working machine which is located at the front of the power vehicle and works while following the ground is freely rotatable. In a mower suspension device pivotally supported and supported so as to suspend a working machine from a middle of a connection link via a pair of left and right suspension devices, the suspension device includes a rod body having a plurality of through holes. A receiving portion attached to the outside of the connecting link, through which the rod body is inserted, a cylindrical boss material fitted into the rod body, and a pin for fixing the cylindrical boss material to the rod body; A mower suspension device, characterized in that the boss member is provided with one through hole whose vertical position can be adjusted at intervals smaller than the interval between through holes formed in the rod body.

[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 powered vehicle having large-diameter front wheels 2 and 2 and small-diameter rear wheels 3 and 3 and usually driving only front wheels 2 and 2 to drive.

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

[0007] Vent portions 19 and 20 through which air can flow are formed at the front and rear portions of a box-shaped bonnet 18 covering the fuel tank 14, the engine 9, the radiator 12, and the like, and the fan 10 rotates. Then, the outside air is taken into the bonnet 18 and is discharged rearward from the rear ventilation portion 20.

Next, the construction of the mower body mounted on the front part of the body will be described. First links 21, 21 pivotally supported at the lower part of the step 7, and rotate up and down integrally with the left and right.
The second link 22, 22 is inserted into the hollow tip of
Here, a connecting link 23 for connecting the working machine is formed. The second links 22, 22 are pins 24, 24
, So that the left and right sides can be swung up and down independently by a predetermined angle. At the tip of the second link 22, 22, a mower deck 26 is provided with a pin 27,
27, it is detachably pivotally supported.

In the mower deck 26, three rotating shafts 28,
The cutting blades 30, 30, 30 are attached to the lower portions of the rotating shafts 28, 28, 28.
Reference numeral 32 denotes a gear box fixed to the upper surface of the mower deck 26; 33, an input shaft supported by the gear box 32;
Is a universal joint connecting the input shaft 33 and a PTO shaft (not shown) on the vehicle side, and 38 is a first link 2.
Hydraulic cylinders 40, 40 provided at the lower part of the machine body for raising and lowering 1, 21 are suspension mechanisms for supporting the rear part of the mower deck 26. This suspension mechanism 4
0 and 40 are the suspension rods 45 and 45 and the second link 2
A plate 42 attached to the intermediate lateral side of 2, 22;
42, and cylindrical boss members 44, 44, and pins 47, 47 for preventing the suspension rods 45, 45 from slipping off. The axial direction of the boss members 44, 44 is larger than the center in the axial direction. One through hole 50 is formed at a position deviated to one side.

On the other hand, a plurality of through-holes 52 are formed in the suspension rod 45 side in the longitudinal direction thereof, and the boss members 44, 44 are provided.
Of the through hole 50 on the side of the suspension rod 45 and the through hole 52 on the side of the hanging rod 45.
The height of the rear part of the mower deck 26 is adjusted so that the height of the mower deck 26 is adjusted appropriately. The boss members 44, 44 are used upside down, and by being used upside down, two-stage adjustment can be performed at intervals smaller than the interval T between the through holes 52 of the hanging rod 45. ing.
In the figure, reference numeral 48 denotes a gage wheel for supporting the front portion of the mower deck 26, and 49 denotes a gage fixed to the upper surface of the mower deck 26.
This is a supporting frame for the jig wheel 48.

Next, the operation will be described. In the embodiment described above, when adjusting the height of the rear part of the mower deck 26,
First, the hanging rod 45 and the pin 47 inserted in the cylindrical boss member 44 are withdrawn from the through holes 50 and 52, and then the protrusion of the upper end of the rod 45 with respect to the plate 42 is changed. The other through hole 52 on the 45 side is selected, and the boss material 44 and the through hole 50 of the suspension rod 45 are selected.
The pin 47 is inserted through 52. Now, when adjusting the hole position at an interval smaller than the interval T between the through holes 52 for one pitch of the suspension rod 45, the boss member 44 is turned upside down as shown in FIGS. use.

As described above, since one through hole 50 is provided in the cylindrical boss member 44 and the two holes are adjusted by inverting the through hole 50, the through hole 52 provided in the hanging rod 45 is provided. The combination of and allows a plurality of stages of cutting height adjustment. Conversely, the number of through holes 52 on the rod 45 side can be reduced,
It has the feature that the labor of processing can be saved. If different colors are applied to the end face of the cylindrical boss member 44, the operator can easily identify the operator, which is convenient.

Next, the configuration of a comparative example shown in FIGS. 6 to 10 will be described. Components having the same or similar configuration as those of the above-described embodiment are denoted by the same reference numerals, and only components having different configurations are denoted by different reference numerals. A plurality of step-like locking grooves 56 are provided on the outer periphery of a cylindrical boss member 55 described as a comparative example. The distance between the adjacent locking grooves 56, 56 in the height direction is smaller than the distance T between the through holes 52 on the hanging rod 45 side as in the case of the previous embodiment.

At the lower part of each locking groove 56, a locking pin 57 is provided for each one. Reference numeral 58 denotes a lock pin which is inserted into the suspension rod 45 to define the suspension position of the mower deck 26. After the approximate lift position of the rear of the mower deck 26 is determined, the lock pin 58 is inserted into the through hole 52 from the side. Then, the cylindrical boss member 55 is moved upward to insert the lock pin 5 into one of the locking grooves 56.
8 are fitted. Then, the ring 60 attached to the head of the lock pin 58 is rotated so as to be fitted and engaged with the locking pin 57 and fixed. According to this embodiment, the height can be adjusted without removing the lock pin 58.

Reference numeral 61 in the figure denotes a link connecting the rear part of the mower deck 26 and the front part of the fuselage. A long hole 62 is formed at the end of the link 61 on the machine side. During operation, the fixing pin 64 on the machine side relatively moves in the long hole 62. When the connecting oil 23 is moved upward by supplying the hydraulic oil to the upper part, the link 23 rotates upward to lift the rear end of the mower deck 26, and the suspension rod 45 projects greatly upward. .

When mowing grass and weeds, mower deck 2
Since the work is performed with the rear portion of the cylinder 6 floating, the lower surface of the cylindrical boss member 55 is always in contact with the upper surface of the plate 42 during the operation. 11, 12, and 13 show the mower deck 2.
6 and a support frame 49 of a gage wheel 48 fixed to the upper surface
This is an explanation of the mounting structure.

The difference from the above-described embodiment will be described. On the upper surface of the mower deck 26, U-shaped receiving frames 70, 71, 72 as viewed from above are fixed in the horizontal direction. One receiving frame 70 is fixed to the grass discharge port side (right side) of the mower deck 26, and two receiving frames 71 and 72 are fixed to the opposite side (left side) at appropriate intervals in the left and right lateral directions.
As is clear from FIG. 11, the receiving frame 71 is the second link 22.
It also serves as a plate to support the front end of the. These supporting frames 7 are provided on both left and right sides of the support frame 49.
A U-shaped frame 74 smaller than 0, 71, 72 is fixed, and this frame 74 is overlapped with the receiving frames 70, 71 (or 72) and fastened and fixed with two mutually orthogonal bolts 75, 76. Make up.

When cutting a corner, such as at the side of a road or at the edge of a garden, the gage wheel 48 is in the way and the uncut portion is increased. It is moved to the position (B) shown in FIG. In a work in a place with a lot of irregularities, as shown in FIG. 13, when the gage wheel 48 is inside, the gage wheel 48 rides on a convex portion of the ground, and the rotating cutting blade 30 cuts the ground, so-called tiger cutting state. Will occur.
In such a case, the gage wheel supporting frame 49 is connected to the housing shown in FIG.
(A).

Finally, the hydraulic circuit diagram of FIG. 14 will be briefly described. In the figure, reference numeral 80 denotes a hydraulic cylinder of a fully hydraulic steering device interposed for steering the rear wheels 3, 3, 82 denotes a power steering unit incorporating its valves and the like, 84
Is a hydraulic valve for raising and lowering the mower deck 26, 86 is a hydraulic pump, and 88 is a diversion valve. A part of the hydraulic oil discharged from the hydraulic pump 86 enters the power steering unit 82 of the all-hydraulic steering device through the flow dividing valve 88, and the rest flows into the hydraulic valve 84. Power steering unit 8
The drain oil discharged from 2 enters the gear box 32 once before returning to the transmission case which is a hydraulic tank, cools the inside of the gear box 32 and is discharged to the transmission case.

[0020]

As described above, according to the present invention, the connecting link is pivotally supported at the front of the motor vehicle, and the front end of the connecting link is located at the front of the motor vehicle and follows the ground. A mower suspension device that pivotally supports a working machine for performing work and supports the working machine so as to be suspended from a middle of the connection link via a pair of left and right suspension devices. A rod body having a plurality of through-holes, a receiving part attached to the outside of the connecting link and penetrating the rod body, a cylindrical boss material fitted into the rod body, and fixing the cylindrical boss material to the rod body And the cylindrical boss member is provided with one through-hole that can be adjusted vertically at intervals smaller than the interval between the through-holes drilled in the rod body. And the load of the mower deck as before There one hair - do not occur inconvenience would bend it since no exerted intensive the pin. In addition, the cylindrical boss material is provided with one through hole that can be adjusted vertically at intervals smaller than the interval between the through holes formed in the rod body. Is improved.

[Brief description of the drawings]

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

FIG. 2 is an enlarged side view of a riding lawn mower partially omitted from illustration.

FIG. 3 is a side view of a main part for explaining an operation.

FIG. 4 is a side view of a main part for explaining an operation.

FIG. 5 is an enlarged side view of a conventional device.

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

FIG. 7 is a perspective view of a main part.

FIG. 8 is a side view of a main part.

FIG. 9 is a plan view of a main part.

FIG. 10 is a side view.

FIG. 11 is a plan view of a mower deck portion.

FIG. 12 is a perspective view of a main part.

FIG. 13 is a front view illustrating the operation.

FIG. 14 is a hydraulic circuit diagram.

[Description of Signs] 1 Moving vehicle 2 Front wheel 3 Rear wheel 6 Seat 21 First link 22 Second link 23 Connecting link 26 More deck 32 Gear box 40 Hanging mechanism 44 Boss material 45 Hanging rod

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-181706 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01D 34/412-34/90 A01B 59 / 048

Claims (1)

(57) [Claims] 1. A work machine which pivotally supports a connecting link at a front portion of a power vehicle and rotates at a front end of the connecting link and which is located at a front portion of the power vehicle and works while following the ground. A mower suspension device, which is pivotally supported to freely move and supports the working machine from the middle of the connecting link via a pair of left and right suspension devices, wherein the suspension device has a plurality of through holes. A rod body, a receiving portion attached to the outside of the connecting link and through which the rod body is inserted, a cylindrical boss material fitted into the rod body, and a pin for fixing the cylindrical boss material to the rod body, A mower suspension device, wherein the cylindrical boss member is provided with one through hole whose vertical position can be adjusted at an interval smaller than an interval of the through holes formed in the rod body.