JPH1156060A - Support structure for reel blade in lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject support structure so designed that a bearing rotationally supporting one end of a reel shaft is set up on the circular hole of a keyhole-shaped support hole and the width of the groove of the support hole is set so as to be threadable for the reel shaft to enable at reel blade to be exchanged easily. SOLUTION: This support structure for a reel blade 30 is designed to rotationally support via a bearing both ends of a reel shaft 31 between side plates 10, 10 mounted along both sidewalls of a main body housing 2; wherein the bearing rotationally supporting one end of the reel shaft 31 is set up on the circular hole 10c of a keyhole-shaped support hole via a bearing holder 34 detachable in the direction of the axis of the reel shaft 31 and the width of the groove of the support hole is set so as to be threadable for the reel shaft 31; optionally, a driven pulley 36 mounted with a transmission belt 37 between the pulley 36 and a driving pulley 25 is set up on the tip side apart from the bearing holder 34, on one side of the reel shaft 31, and an openable lid 8 is set up on the sidewall of the housing 2, on the side of the driven pulley 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel blade support structure for a lawn mower.

[0002]

2. Description of the Related Art Generally, a reel blade of a lawnmower needs to be replaced when the blade becomes dull due to wear or chipping. On the other hand, since the reel blade has a relatively large weight, it is usually structured so as to rotate relatively firmly between a pair of left and right side plates. For this reason, in the case of replacing the conventional reel blade, it is necessary to dismantle the periphery of the support part after removing the both side plates together from the main body housing.

[0003]

For this reason, the replacement work of the reel blade is very troublesome and troublesome. Therefore,
SUMMARY OF THE INVENTION It is an object of the present invention to provide a reel blade support structure in which a reel blade can be easily replaced in a lawn mower.

[0004]

According to the first aspect of the present invention, there is provided a support structure for rotatingly supporting both ends of a reel shaft via a bearing between a pair of left and right side plates attached along both side walls of a main body housing. A support structure for supporting one end of the reel shaft in a circular hole portion of a keyhole-shaped support hole cut out from a lower end of one side plate in an axial direction of the reel shaft. And the width of the groove of the support hole is set to a width that allows the reel shaft to be inserted.

According to this support structure, the bearing holder can be removed from the circular hole of the support hole by moving the bearing holder in the axial direction of the reel shaft. Can be moved in its axial direction. By moving the reel blade in the axial direction, the other end of the reel shaft can be removed from the side plate. On the other hand, since the groove portion of the support hole is formed to have a width that allows the reel shaft to be inserted, one end side of the reel shaft can be removed from the side plate through this groove portion, and the reel blade is removed from between the two side plates as described above. be able to. To mount the reel blade, the procedure may be reversed.

As described above, the reel blade can be removed from between the two side plates simply by removing the bearing holder on one end side of the reel shaft while leaving the both side plates as they are. After removal, there is no need to perform work such as disassembling the periphery of the rotation support portion to a considerable extent, so that the reel blade can be replaced more easily than in the past.

According to a second aspect of the present invention, there is provided the support structure according to the first aspect, wherein a transmission belt is mounted between one end of the reel shaft and the drive pulley at a position more distal than the bearing holder. A driven pulley is attached, and a lid that can be opened and closed is provided on a side wall of the main body housing on a side of the driven pulley.

According to this support structure, the side of the driven pulley is opened when the lid is opened, so that the work of attaching and detaching the transmission belt can be easily performed from the side. Usually, the drive pulley and the driven pulley over which the transmission belt is wound are located in the gap between the main body housing and the side plate. Therefore, if the lid is not provided, the transmission belt is removed when replacing the reel blade. Requires that the lawnmower be turned over. In this regard, according to the configuration of claim 2, since the work of attaching and detaching the transmission belt can be performed from the side, there is no need to turn the lawnmower upside down, and the transmission belt is placed in a normal posture with the wheels grounded. Can be easily attached and detached.

According to a third aspect of the present invention, there is provided the supporting structure according to the second aspect, wherein a screw hole is provided in the driven pulley in accordance with a position of a screw for fixing the bearing holder to the side plate. Features.

According to this supporting structure, the screw for fixing the bearing holder can be loosened or tightened by the screwdriver through the screw hole provided in the driven pulley. The bearing holder can be removed from the side plate without removing it, and in this respect, the replacement operation of the reel blade can be further simplified.

[0011]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 shows an entire lawn mower 1 to which a reel blade support structure according to the present embodiment is applied. In the figure, 2 is a main body housing, 3 is an operation handle mounted obliquely upward on the rear part of the main body housing 2, 4 is a pair of left and right front wheels, 5 is a cylindrical rear wheel, and 6 is a cut grass. Shows a bag for doing so. These do not require any particular changes. Reference numeral 7 denotes a blade height adjusting lever disposed on the front side of the upper surface of the main housing 2, and reference numeral 8 denotes a lid provided on a side wall of the main housing 2.

As shown in FIGS. 2 to 4, the main body housing 2 has an upper surface 2a having a smooth curved end.
And a pair of left and right side walls 2b and 2c, the lower surfaces of which are open. A pair of left and right side plates 10 and 11 are mounted inside the side walls 2b and 2c in parallel with each other. Both side plates 10 and 11 are fixed inside the main body housing 2 by screws 12 to 12 and 13 to 13, respectively.

At the tips of both side plates 10 and 11,
A support plate 15 having a substantially triangular shape (see FIG. 2) is attached via a support shaft 14 so as to be vertically rotatable.
Since the upper ends of the support plates 15 and 15 are connected by the connection plate 17, the support plates 15 and 15 rotate vertically integrally about the support shafts 14 and 14. The front wheels 4 are provided at the corners of the front ends of the support plates 15, 15, respectively.
Are rotatably supported. A bracket 16 for holding an adjustment position is attached to the upper surface of the connection plate 17, and the blade height adjustment lever 7 is supported so as to extend between the bracket 16 and the connection plate 17. . This will be described later.

The rear wheel 5 is rotatably mounted between the rear ends of the side plates 10 and 11.

Next, an electric motor 20 and a reel blade 3 are disposed between the side plates 10 and 11 from the left side in FIG.
0 and the fixed blade 40 are attached. First, the motor case 21 of the electric motor 20 has a cylindrical shape as shown in the figure, and both left and right end surfaces thereof are fixed to both side plates 10 and 11 by screws 23 to 23. It is attached while being sandwiched between the side plates 10 and 11. An armature 22 and the like are incorporated inside the cylindrical motor case 21.

Both ends of the armature shaft 24 are provided with bearings 27, 2
8, the tip of which is protruded from the side plate 10, and a driving pulley 25 is attached to the protruding portion. As shown in FIG. 4, one end face of the motor case 21 is closed by a left side (upper side in the figure) side plate 10, and the side plate 10 has a function of forming a part of the motor case 21. . The bearing 27 is accommodated in a holder 10 a provided on the side plate 10. A cooling fan 26 is attached to the armature shaft 24 inside the bearing 27 (the lower side in the figure). As shown in FIG. 3, a bearing 28 for rotatably supporting the rear end of the armature shaft 24 is provided with a bearing holder 21 integrally formed inside the motor case 21.
a.

Next, a reel blade 30 is rotatably mounted behind the electric motor 20. This reel blade 3
Numeral 0 indicates a plurality of spirally twisted blades arranged in a substantially cylindrical shape, and the reel blade 30 itself does not require any particular change. The reel blade 30 is rotatably supported at both ends of a reel shaft 31 by bearings 32 and 33 and is rotatably supported between the side plates 10 and 11. The left bearing 32 for rotatably supporting the left end of the reel shaft 31 is accommodated in a bearing holder 34 attached to the side plate 10. The bearing holder 34 is fitted into a keyhole-shaped support hole 10b formed in the side plate 10 and attached by four screws 35 to 35 (see FIG. 2).
Therefore, if the screws 35 to 35 are removed, the bearing holder 3
4 is outside the side plate 10 (upper side in FIG. 4)
Can be removed by pulling it out.

One end of the reel shaft 31 protrudes from the bearing holder 34, and the driven pulley 36 is fixed by a nut 36b according to the protruding portion. A transmission belt 37 is stretched between the driven pulley 36 and the driving pulley 25. In the driven pulley 36, through holes 36a to 36a are formed at four equal positions on the same circumference.
The through holes 36a to 36a are arranged in accordance with the positions of screws 35 to 35 for fixing the bearing holder 34, and the four screws 35 to 35 are always required at four positions in the rotation direction of the driven pulley 36. 35 is set so as to match the position. Thereby, without removing the driven pulley 36 from the reel shaft 31, each of the screws 35 to 35 is loosened and the bearing holder 3
4 can be removed from the side plate 10.

The right bearing 33 for rotatably supporting the right end of the reel shaft 31 is accommodated in a recess 11a provided in the right side plate 11 as shown in FIG. Bearing 33
Is relatively loosely housed in the recess 11a, so that if the reel blade 30 is moved in the axial direction,
It can be easily removed from the concave portion 11a while being attached to one side.

Here, a keyhole-shaped support hole 10b to which the bearing holder 34 is attached is shown in FIG. The support hole 10b includes a circular hole 10c having a diameter D into which the bearing holder 34 can be fitted, and a groove 10d formed by cutting from the lower end of the side plate 10 and opening to the circular hole 10c. The width L of the groove 10d is smaller than the outer diameter d1 of the bearing holder 34 and the outer diameter d2 of the reel shaft 31.
It is set larger than. For this reason, the bearing holder 3
4 is mounted on the side plate 10, the reel blade 30 is rotatably supported so as not to move in the radial direction. However, when the bearing holder 34 is pulled out from the circular hole 10c, only the reel shaft 31 is in the circular hole 10c. , The reel blade 30 can be moved in the radial direction while the reel shaft 31 is inserted into the groove 10d, and thus the groove 1 can be moved.
When the reel shaft 31 is removed from the support hole 10 through Od, one of the reel blades 30 can be removed from the side plate 10.

Next, a fixed blade 40 is mounted behind the reel blade 30 via a fixed blade holder 41. The fixed blade holder 41 has a frame shape in which the lower part of the reel blade 30 is opened as shown in FIGS. 2 and 3, and its rear end is rotatable up and down via support shafts 42, 42. It is supported by 10,11. On the other hand, the tip side of the fixed blade holder 41 is provided with a screw 43 for position adjustment,
It is supported by the main body housing 2 via 43. FIG.
A compression spring 45 is interposed between the position adjusting screw 43 and the main housing 2 as shown in FIG.

For this reason, the position adjusting screws 43, 4
When each of the fixed blades 3 is loosened, the distal end side of the fixed blade holder 41 is pushed down by the compression spring 45, whereby the fixed blade holder 41 can be rotated downward to displace the position of the fixed blade 40 downward. . When the fixed blade 40 is displaced downward, the distance between the fixed blade 40 and the reel blade 30 is increased, and more grass can be bitten at a time. On the other hand, when the screws 43 for position adjustment are tightened against the compression spring 45, the distal end side of the fixed blade holder 41 is displaced upward, whereby the fixed blade holder 41 is rotated upward and the fixed blade holder 41 is rotated upward. The position of 40 can be displaced upward. When the fixed blade 40 is displaced upward, the distance between the fixed blade 40 and the reel blade 30 is reduced, and the amount of grass that bites at once can be reduced.

Next, as shown in FIGS. 2 and 4, the lid 8 is attached to the side of the driven pulley 36. The lid 8 is attached to a part of the left side wall 2b of the main body housing 2 where a side part of the driven pulley 36 is opened by screws 8a to 8a. Therefore, when the cover 8 from which the screws 8a to 8a are removed is removed, the side of the driven pulley 36 is opened. Various operations such as the work of attaching and detaching the transmission belt 37 can be performed through the opened opening 8b.

Next, the above-described blade height adjusting lever 7 will be described. The lever 7 is used to change the height (blade height) of the reel blade 30 with respect to the ground to adjust the cutting height of the lawn.
And the connection plate 17. FIG. 7 shows the details of this attachment location. As shown in the drawing, a through hole 17a is formed substantially at the center of the connecting plate 17 on the left and right, and a long slot 16a on the left and right is formed in the bracket 16 mounted on the upper side.

The lever 7 is inserted into the through hole 17a and the slot 16a.
Is inserted. A flange 7b is provided at the lower end of the lever 7.
Is formed, so that the lever 7 does not come out upward. On the other hand, the lever 7 protrudes further upward through the slot 16a, and the retaining ring 7c is attached to the protruding portion, so that the lever 7 is supported so as not to come off from the bracket 16 and the connecting plate 17 after all. I have. However, the retaining ring 7c and the bracket 16
Since an appropriate gap is provided as shown in the figure, the upper surface can be tilted from an upright position shown by a solid line in the figure to an inclined position shown by a two-dot chain line. Since a tension spring 18 is interposed between the lever 7 and the bracket 16, the lever 7 is urged toward the upright position.

The upper end of the lever 7 thus supported is projected upward through the blade height changing groove 9 of the blade height adjusting plate 19 attached to the upper surface 2a of the main body housing 2, and the upper end of the protruding portion is formed. The knob 7a is attached to the. The blade height changing groove 9 is a substantially comb-shaped groove as shown in FIG. 6, and is a single longitudinal groove 9a long in the front-rear direction of the lawnmower 1.
And a plurality of (five in the figure) lateral grooves 9b to 9b that are cut from the vertical groove 9a to the right side (the left side in the figure). The five lateral grooves 9b to 9b are formed parallel to each other at appropriate intervals in the front-rear direction. When the lever 7 enters one of the transverse grooves 9b, the lever 7 is in the upright position, so that the tension spring 18 holds the lever 7 in the upright position in the transverse groove 9b.

When the lever 7 is tilted to the left (right side in FIG. 9) against the tension spring 18, the lever 7 is moved to the vertical groove 9a.
, Whereby the lever 7 can be moved back and forth along the vertical groove 9a. Lever 7
Is moved to the position of another lateral groove 9b, and then the hand holding the knob 7a is released, the lever 7 enters the other lateral groove 9b by the tension spring 18, and is held in the lateral groove 9b.

By gradually changing the tilt position of the lever 7 in this manner, the support plates 15, 15 can be rotated up and down around the support shafts 14, 14.
Thereby, the height of the front wheels 4 and 4 can be adjusted.
Since the height of the rear wheel does not change, the height of the reel blade 30 and the fixed blade 40 from the ground can be adjusted by adjusting the height of the front wheels 4 and 4. As shown in FIG. 6, a numerical value indicating the blade height is displayed on the right side (left side in the figure) of the blade height adjusting plate 19 in accordance with the position of each of the lateral grooves 9b to 9b. Set the lever 7 to the uppermost (rear) lateral groove 9
When it is located at b, the blade height becomes the smallest (8 mm). On the other hand, when the lever 7 is positioned in the lowermost (front) lateral groove 9b, the blade height becomes the largest (25 mm).

The lawn mower 1 according to the present embodiment thus configured
According to the above, since the motor case 21 of the electric motor 20 is mounted so as to be sandwiched between the side plates 10 and 11, the rigidity of the side plates 10 and 11 as a frame is enhanced. The motor 20 also has a function of increasing the frame rigidity of the lawn mower 1. For this reason, as in the conventional case, the two side plates 10, 1
It is not necessary to separately install a reinforcing member for increasing the rigidity of the frame between the first and second frames, thereby reducing the number of components and reducing the cost. Can be prevented from being deposited.

Further, since the left side plate 10 is provided with a function of forming a part of the motor case 21, the number of parts can be reduced and the weight of the lawnmower 1 can be reduced. it can. The addition of the function of the side plate 10 as a part of the motor case 21 means that a bearing 27 for rotatably supporting the armature shaft 24 is attached to the side plate 10.

In the illustrated embodiment, only the left side plate 10 has a function as a part of the motor case 21. However, the rear end of the armature shaft 24 is rotated to the right side plate 11. If you support,
Motor case 2 on both left and right side plates 10 and 11
1 can have both front and rear functions. Conversely, the motor case 2 is attached to the side plates 10 and 11.
The motor case 21 itself may be provided with a front surface and a rear surface, and the front surface and the rear surface may be fixed to the side plates 10 and 11.

Further, according to the illustrated lawn mower 1, the bearing holder 34 is moved in the axial direction of the reel shaft 31 so that the support hole 1 is moved.
0b can be extracted from the circular hole 10c.
The reel blade 30 can be moved in the axial direction with the bearing 32 and the bearing holder 34 attached to the reel shaft 31. By moving the reel blade 30 in the axial direction, the other end of the reel shaft 31 may be moved together with the bearing 33 or the bearing 33 may be left in the concave portion 11a and the side plate 11 may be moved.
Can be removed from. On the other hand, the groove 10 of the support hole 10b
Since d is formed to have a width L through which the reel shaft 31 can be inserted, one end of the reel shaft 31 can be removed from the side plate 11 through the groove 10d. 11 can be removed. To mount the reel blade 30, the procedure may be reversed.

As described above, both side plates 10 and 11
Without removing it from the main housing 2,
By simply removing the bearing holder 34 at one end of the reel shaft 31 from the side plate 10, the reel blade 30 can be removed from between the side plates 10 and 11. Since there is no need to perform a work of disassembling the periphery of the rotation support portion to a considerable extent, the reel blade 30 can be replaced more easily than in the past.

Further, since the lid 8 is provided on the side of the driven pulley 36 and on the side wall of the main body housing 2, when the lid 8 is opened, the side of the driven pulley 36 is opened to thereby open the transmission belt. The attachment / detachment work of 37 can be easily performed from the side. Here, in a lawn mower of this type, the drive pulley 25 and the driven pulley 36, around which the transmission belt 37 is stretched, are usually placed in the gap between the side wall 2b of the main body housing 2 and the side plate 10, as shown in FIG. If the illustrated lid 8 is not provided, the reel blade 30
In order to remove the transmission belt 37 at the time of replacement, the lawnmower 1 needs to be turned upside down. In this regard,
According to the illustrated lawn mower 1, since the work of attaching and detaching the transmission belt 37 can be performed from the side, there is no need to turn the lawn mower 1 upside down, and a normal posture in which the wheels 4, 4, and 5 are grounded. Thus, the work of attaching and detaching the transmission belt 37 can be performed easily, and also in this respect, the work of replacing the reel blade 30 can be simplified.

Further, the driven pulley 36 is provided with holes 36a-36a for screwing in accordance with the positions of the screws 35-35 for fixing the bearing holder 34 to the side plate 10, so that the holes 36a-36a are provided. , The screws 35 to 35 for fixing the bearing holder 34 can be loosened or tightened with a screwdriver, so that only the bearing holder 34 is removed from the side plate 10 without removing the driven pulley 36 from the reel shaft 31. Can be removed,
In this respect, the operation of replacing the reel blade 30 can be further simplified.

The blade height adjusting lever 7 provided on the upper surface 2a of the main body housing 2 is provided only at one position in the center of the upper surface 2a in the width direction. Thereby, the height position of the pair of left and right front wheels 4 and 4, that is, the blade height can be adjusted. For this reason, the user of the lawnmower 1 can adjust the blade height with one hand, and in this respect, the operability (usability) of the lawn mower 1 is better than before.

Conventionally, as disclosed in, for example, Japanese Utility Model Publication No. 61-34976, a blade height adjusting lever is arranged for each of a pair of left and right front wheels, and the blade height is adjusted by adjusting the positions of both levers. Had a configuration. For this reason, it was necessary to adjust the position of both levers at once with both hands, or to adjust the position separately with left and right two times with one hand. Therefore, the blade height adjustment was troublesome and the usability was not good. According to the lawn mower 1 of the embodiment, such a problem does not occur.

[Brief description of the drawings]

FIG. 1 is an overall side view of a lawn mower.

FIG. 2 is a view showing the embodiment of the present invention, and is a side view in which a part of the internal structure of the lawn mower is cut away.

FIG. 3 is a view of the lawn mower viewed from a lower surface side.

FIG. 4 is a view of the same lawn mower viewed from below, and is a detailed view of the vicinity of a driving force transmission system between an electric motor and a reel blade.

FIG. 5 is a side view of the support hole, taken along line (5)-(5) of FIG. 4;

FIG. 6 is a plan view of a distal end portion of the main body housing, showing a periphery of a blade height adjusting lever.

FIG. 7 is a sectional view taken along line (7)-(7) of FIG. 6, and is a side view showing a blade height adjusting lever and a supporting structure thereof.

[Description of Signs] 1 ... lawn mower 2 ... body housing 2a ... top surface 2b ... left side wall, 2c ... right side wall 3 ... operation handle 4 ... front wheel, 5 ... rear wheel 7 ... blade height adjustment lever 8 ... lid 10 ... Left side plate 10b Support hole 10c Circular hole 10d Groove 20 Electric motor 30 Reel blade 31, Reel shaft 34 Bearing holder 36 Driven pulley 40 Fixed blade

Claims (3)

[Claims] 1. A reel blade supporting structure in which both ends of a reel shaft are rotatably supported via a bearing between a pair of left and right side plates attached along both side walls of a main body housing, wherein one end of the reel shaft is connected to one end of the reel shaft. A bearing to be rotatably supported is attached to a circular hole of a keyhole-shaped support hole cut out from a lower end of one of the side plates via a bearing holder which is removable in an axial direction of the reel shaft, and a groove of the support hole is provided. A support width of the reel blade in the lawnmower, wherein a width of the reel blade is set to a width that allows the reel shaft to be inserted. 2. The supporting structure according to claim 1, wherein a driven pulley having a transmission belt mounted between the driving shaft and a driven pulley is attached to one end of the reel shaft, more distally than the bearing holder. A support structure for a reel blade, characterized in that a lid which can be opened and closed is provided on a side wall of a main body housing at a side of a driven pulley. 3. A support structure for a reel blade according to claim 2, wherein a screw hole is provided in a driven pulley in accordance with a position of a screw for fixing the bearing holder to the side plate. Construction.