JPH0538221A - Blade fitting device for mower - Google Patents

Abstract

(57) [Abstract] [Purpose] The blade 5 is attached to the blade shaft 1 of the mower by clamping the lining disk 2 to tighten the blade 5, thereby reducing rotational vibration of the blade 5. A boss 3 having a lining disc 2 is attached to a driven blade shaft 1 so as to rotate integrally. A spacer 4 facing the lower end surface of the boss 3 and a blade 5 facing the lining disk 2 are provided on the lower end of the blade shaft 1 so that they can be tightened with a tightening tool 6. The boss 3
A shim 7 is interposed between the lower end surface of the spacer 4 and the spacer 4, and a lining 8 is interposed between the lining disk 2 and the blade 5, and is clamped and clamped by the fastener 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower blade mounting device.

[0002]

2. Description of the Related Art As a mounting form of a bouredo on a blade shaft, a leaf spring or the like is interposed between the tightening seat and the blade in order to securely tighten and fix the blade. However, it is difficult to obtain the horizontal accuracy of the blade, which easily causes vibration. The present invention eliminates such a defect.

[0003]

According to the present invention, a boss 3 having a lining disc 2 at its lower end is attached to a blade shaft 1 to be driven so as to rotate integrally, and a boss 3 is attached to the lower end portion of the blade shaft 1. A spacer 4 facing the lower end surface of the boss 3,
The lining disc 2 and the opposing blade 5 are provided so that they can be fastened by a fastening tool 6, and the lower end surface of the boss 3 and the spacer 4 are provided.
And a lining 8 between the lining disk 2 and the blade 5, and a mower blade attachment device for clamping and clamping with the fastening tool 6.

[0004]

[Advantageous Effects of the Invention] The boss 3 having the lining disk 2 is inserted into the blade shaft 1 and, further, a proper number of shims 7 are interposed below the boss 3 to interpose the spacer 4 and the lining 8. The fastener 6 inserted in 5 is inserted into the lower end of the blade shaft 1 and tightened. This fastener 6
The shim 7 between the lower end surface of the boss 3 and the spacer 4 is compressed by the tightening force of the boss 3, and the lining 8 is pressed so as to be sandwiched between the lining disk 2 and the blade 5, and the lining 8 is The friction braking force is maintained in a constant state by the shim 7, and is transmitted to the blade 5 by the rotation of the blade shaft 1 and the friction of the lining 8. When a resistance greater than the frictional force of the lining 8 acts on the blade 5, the lining 8 will slip.

Since the blade 5 is driven from the blade shaft 1 through the lining 8 as described above, the number of unstable elements is small and horizontal accuracy can be easily obtained as compared with a form such as a leaf spring. It can be prevented. Further, the mounting structure is simple, and since the overload can be absorbed by the lining 8, the impact can be prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1, 2, and 8, a mower has a gauge wheel 10 arranged at the front of a mower deck 9, a drive roller 11 arranged at the rear, and is driven by an engine 12 provided on the upper side. The blade shaft 1 is projected to the lower side of the mower deck 9, and the blade 5 is attached to the lower end of the blade shaft 1. 13 is a discharge tube that opens toward the rear side of the mower deck 9, 14 is an operation handle, and 15 is a collector bag.
It can accommodate cut grass.

A boss 3 fitted on the outer circumference of the blade shaft 1 is keyed in a fixed position at a key 16, and a shim seat 17 is formed at the center of the lower end of the boss 3. The disk 2 is attached integrally. A spacer 4 is fitted to the lower end of the boss 3, and a shim seat 18 formed on the lower end of the spacer 4 and the shim seat 1 of the boss 3 are attached.
A proper number of shims 7 are interposed between the lining 8 and
The clamping force of can be adjusted.

A hole 19 into which the shim receiving portion 18 of the spacer 4 can be fitted is provided in the central portion of the blade 5, and the lining receiving surface 2 for receiving the lining 8 is provided on the outer peripheral portion of the hole 19.
0 is formed, and a blade edge is formed on the outer peripheral portion. The lining 8 is formed in a donut shape with an appropriate thickness, and is sandwiched between the lining disk 2 and the lining receiving surface 20 of the blade 5, and the blade 5 is rotated by the frictional force due to this sandwiching pressure.

The tightening tool 6 uses bolts for the blade shaft 1
It can be screwed axially from the tip end surface and can be tightened via a washer 21 that receives the lower surfaces of the spacer 4 and the blade 5. Since the tightening gap between the spacer 4 and the blade 5 which are simultaneously tightened and fixed by the washer 21 is determined by the number of shims 7, the number of shims 7 is reduced when the tightening force of the lining 8 is insufficient. If the tightening force is excessive, adjust the number of shims 7 to increase.

In FIG. 3, the difference from the above example is that the lining disk 2 faces the upper and lower surfaces of the blade 5, and the upper and lower surfaces of this blade 5 and the upper lining disk 2
The lining 8 is interposed between the lining 8 and the lower lining disc 2, and the lining 8 is fastened with the fastener 6. Further, the central portion of the lower lining disc 2 is recessed to reduce the exposure of the head 22 of the fastener 6.

In FIG. 4, the difference from the above example is that the upper lining disc 2 and the boss 3 are independent parts, and a disc spring 19 is interposed between the two, and the disc spring 19 is pressed against the lining 8. Adjust the friction force. Further, a cylindrical body 23 is formed on the outer peripheral portion of the lining disk 2, and a partial flat surface portion 25 of the boss 3 is fitted to a partial flat surface portion 24 in the cylindrical body 23 to fit the boss 3 The upper lining disc 2 and the upper lining disc 2 can rotate together.

In FIG. 5, the point different from the above example is that a compression spring 26 in the form of a spiral spring is used instead of the disc spring 19. A plate 28 having spring receiving pieces 27 on both left and right sides is interposed between the lining disc 2 and the boss 3, and the spring receiving pieces 27 are attached to the lining disc 2.
While engaging with the notch 29 of the cylindrical body 23 to prevent rotation, the bottom of the lining disc 2 and the plate 28
A compression spring 26 wound around the outer circumference of the boss 3 is provided between the spring receiving piece 27 and the spring receiving piece 27. The compression spring 26 obtains the frictional force of the lining 8.

In FIG. 6 and FIG. 7, the transmission structure of the drive roller 11 is as follows:
The power take-off shaft 30 that is interlocked from the side is projected toward the rear side, and the interlocking shaft 31 and the pinion shaft 3 through the universal joint are provided.
A gear case 33, which can be moved downward via the gear 2, is provided below the fender 34 at the rear of the mower deck 9. The gear case 33 is internally mounted with a bevel gear 37, a clutch 35 operated by a cam, and the like on a roller shaft 36, and is meshed with the pinion shaft 32. The drive roller 11 has a diameter larger than that of the gear case 33, and the roller shaft 3 is provided on both left and right sides.
It is attached to No. 6 and can run by interlocking rotation.

Further, the gear case 33 has a support arm 38 at the front, and the support arm 38 is pivotally supported 39 up and down with respect to the rear portion of the mower deck 9 to drive the drive roller 1.
The height of 1 can be adjusted appropriately. As described above, since the roller shaft 36 that is directly rotated is transmitted from the power take-off shaft 31 and the like by the meshing of the pinion shaft 32 and the bevel gear 37, the gear case 33 has a structure of a pair of left and right drive rollers 11. It fits low in the rotating area,
It is less necessary to secure a high interval for raising and lowering the gear case 33. The configuration can also be simplified.

[Brief description of drawings]

 The figures show an embodiment of the invention.

FIG. 1 is a side sectional view of a blade mounting portion.

FIG. 2 is a bottom view thereof.

FIG. 3 is a side sectional view showing a partially different embodiment.

FIG. 4 is a side sectional view showing a partially different embodiment.

FIG. 5 is a side sectional view showing another embodiment.

FIG. 6 is a plan sectional view of a roller driving unit.

FIG. 7 is a side view thereof.

FIG. 8 is a side view of the whole.

[Explanation of symbols]

 1 Blade Axis 2 Lining Disc 3 Boss 4 Spacer 5 Blade 6 Tightening Tool 7 Shim 8 Lining

Claims (1)

[Claims] 1. A boss 3 having a lining disk 2 at its lower end is attached to a driven blade shaft 1 so as to rotate integrally, and a lower end portion of the blade shaft 1 faces a lower end surface of the boss 3. A spacer 4 and a blade 5 facing the lining disc 2 are provided so that they can be fastened with a fastening tool 6, and a shim 7 is interposed between the lower end surface of the boss 3 and the spacer 4, and the lining disc is also provided. A mower blade mounting device in which a lining 8 is interposed between the blade 2 and the blade 5 and clamped and clamped by the fastener 6.