Mowing device for lawn mower

Abstract

To provide a mowing apparatus of a lawn mower in which a lawn and grass placed on a cutting blade cover top plate can efficiently be discharged to the outside of a cutting blade cover in a simple and inexpensive configuration, and a portion of a body (hand, foot) is prevented from directly touching a cutting blade pulley and is secure.SOLUTION: A mowing apparatus for a lawn mower is provided with a cutting blade pulley 4 rotating approximately horizontally by belt drive on a top end of a cutting blade shaft 3 pivoted in a cutting blade shaft boss 3a for vertically inserting a top plate 2 of a cutting blade cover 1, and a cutting blade 5 rotating approximately horizontally in the cutting blade cover 1 at the bottom end of the cutting blade shaft 3. In the mowing apparatus for the lawn mower, multiple suction holes 7 and multiple dust discharge blades 8 protruding from the horizontal face 6 toward a lower part are provided in the horizontal face 6 of the cutting blade pulley 4. The mowing apparatus for the lawn mower is configured such that a pulley guard 9 having approximately the same width as the vertical width W with the cutting blade pulley 4 and the dust discharge blade 8 or being wider than the vertical width W is provided in a range including a vertical width W with the cutting blade pulley 4 and the dust discharge blade 8 in a side view, and in a predetermined height H position from the top plate 2 of the cutting blade cover 1, along an outer peripheral edge 4a of the cutting blade pulley 4.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to the configuration of a cutting device that has a dust removal function that prevents cut grass or grass from becoming stagnant on the top plate of the lawnmower's blade cover, and a safety function that prevents direct contact with the rotating part of the cutting blade pulley when part of the body (hand, foot) is inserted from the side of the cutting blade pulley. [Background technology]

[0002] Conventionally, the blade of a lawnmower or the like is driven to rotate by a V-belt wound around a blade pulley from a pulley of an engine output shaft, and the drive can be turned on and off by tensioning and loosening this V-belt. There has been a problem with the top surface of the blade cover of these lawnmowers being covered with cut grass, grass, dust, etc. and stagnation. In particular, in riding grass mowers that have a seat for an operator to sit on in the center of the vehicle body and a mower device on the body belly below the seat, the seat and steps are located above the mower device, making it difficult to clean the grass and grass on the blade cover top plate. In addition, if the blade pulley is rotating when the operator tries to clean the grass and grass on the blade cover top plate by inserting his / her hand from the side of the vehicle body, there is a possibility that the operator will touch the rotating blade pulley and be injured. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-254765 A Summary of the Invention [Problem to be solved by the invention]

[0004] To provide a safe mowing device for a lawn mower that has a simple and inexpensive configuration, can efficiently discharge grass and grass placed on a blade cover top plate to the outside of the blade cover, and prevents any part of the body (hands, feet) from directly touching the blade pulley. [Means for solving the problem]

[0005] The invention described in claim 1 is a cutting device for a lawnmower having a blade pulley 4 that rotates approximately horizontally by belt drive at the upper end of a blade shaft 3 pivoted on a blade shaft boss 3a that passes vertically through the top plate 2 of the blade cover 1, and a blade 5 that rotates approximately horizontally within the blade cover 1 at the lower end of the blade shaft 3, characterized in that the horizontal surface 6 of the blade pulley 4 is provided with a plurality of suction holes 7 and a plurality of dust exhaust blades 8 that protrude downward from the horizontal surface 6, and a pulley guard 9 having a width approximately the same as the vertical width W of the blade pulley 4 and the dust exhaust blade 8 or a width wider than the vertical width W is provided along the outer peripheral edge 4a of the blade pulley 4, in a range that includes the vertical width W of the blade pulley 4 and the dust exhaust blade 8 when viewed from the side, and at a predetermined height H from the top plate 2 of the blade cover 1.

[0006] The cutting device for a lawnmower is characterized in that a bulging portion 10 having a widened shape is provided on the outer periphery of the cutting blade shaft boss 3a on the upper side of the top plate 2 of the cutting blade cover 1.

[0007] In addition, the mowing device for a lawnmower is configured such that a pulley guard 9 is provided that approaches along the outer peripheral edge 4a of the mower blade pulley 4 over the belt winding range of the mower blade pulley 4, and the pulley guard 9 also serves as a belt stopper. Effect of the Invention

[0008] The invention described in claim 1 is a cutting device for a lawnmower, which has a cutting blade pulley 4 that rotates approximately horizontally by belt drive at the upper end of a cutting blade shaft 3 that is pivoted to a cutting blade shaft boss 3a that passes vertically through a top plate 2 of a cutting blade cover 1, and a cutting blade 5 that rotates approximately horizontally within the cutting blade cover 1 at the lower end of the cutting blade shaft 3. The cutting blade pulley 4 has a plurality of suction holes 7 on a horizontal surface 6 thereof and a plurality of dust discharge blades 8 that protrude downward from the horizontal surface 6 thereof, and the cutting blade pulley 4 and the dust discharge blades 8 are disposed within a range including a vertical width W between the cutting blade pulley 4 and the dust discharge blades 8 when viewed from the side. A pulley guard 9 having a width approximately the same as or wider than the vertical width W between the cutting blade pulley 4 and the dust discharge blade 8 is provided along the outer circumferential edge 4a of the cutting blade pulley 4 at a predetermined height H from the cutting blade pulley 2, so that when the cutting blade pulley 4 rotates, air is sucked in through the suction holes 7 of the cutting blade pulley 1, and wind force is generated by the rotation of the dust discharge blade 8, and the wind force flowing to the side of the dust discharge blade 8 is deflected downward by hitting the pulley guard 9, so that the grass and grass placed on the top plate 2 of the cutting blade cover 1 can be efficiently discharged to the outside of the cutting blade cover 1. In addition, the provision of the wide pulley guard 9 makes it difficult for any part of the body to directly come into contact with the rotating cutting blade pulley 1 from the side, improving safety.

[0009] In the invention described in claim 2, a flared bulge 10 is provided on the outer periphery of the blade shaft boss 3a on the top plate 2 of the blade cover 1, so that grass and grass in the vicinity of the blade shaft boss 3a can be easily discharged outward along the flared slope, and grass and grass can be efficiently discharged even with a weak wind force. Also, by attaching the blade shaft boss 3a that supports the blade shaft 3 to the bulge 10, the rigidity of the blade cover 1 and the blade shaft boss 3a can be maintained high.

[0010] The invention described in claim 3 provides a pulley guard 9 that approaches along the outer peripheral edge 4a of the blade pulley 4 over the belt winding range of the blade pulley 4, and since the pulley guard 9 also serves the function of a belt stopper, there is no need to provide a separate belt stopper, and grass and grass placed on the top plate 2 of the blade cover 1 can be efficiently discharged outside the blade cover 1. [Brief description of the drawings]

[0011] [Figure 1]FIG. 2 is an overall plan view showing the blade drive structure of the riding grass cutter. [Diagram 2] FIG. [Diagram 3] 2 is a plan view and a side view of the harvesting device. FIG. [Figure 4] FIG. 11 is a plan view showing another embodiment of the reaping device. [Diagram 5] 3A is a plan view of a cutting blade pulley and FIG. 3B is a sectional front view showing a main portion of the present invention. [Figure 6] 11A and 11B are a plan view and a cross-sectional side view showing another embodiment of the dust discharge blade. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will be described in terms of the embodiment in a riding grass cutter. A seat 15 on which an operator sits is provided in the center of a vehicle body 14, a mower K that can be raised and lowered is provided on the lower abdominal portion of the seat 15, and a handle 18 for steering a handle post 16 and front wheels 17, 17 are provided in front of the seat 15. A step 19 is formed between the seat 15 and the base of the handle post 16, and the handle post 16 is provided with a key switch 21 for starting the prime mover 20, an accelerator lever for manual operation, a travel change lever, a choke lever, an hour meter (not shown), and the like. A prime mover 20 is provided behind the seat 15, and the power of this prime mover 20 is transmitted to the mower K to rotate the mower blade 5 and cut grass. The power of the prime mover 20 is also transmitted to a travel HST (hydraulic continuously variable transmission) 22 provided under the prime mover 20, and drives rear wheels 24, 24 via a transmission case 23. The prime mover 20 has an output shaft 20a protruding downward, and two engine pulleys 27, one above the other, are attached to the output shaft 20a, around which a blade V-belt 25 for driving the mower device K and the HST 22 and a running V-belt 26 are wound. The running V-belt 26 is wound between the upper side of the engine pulley 27 and a mission pulley 23p provided on the upper side of the transmission case 23 for power transmission. The blade V-belt 25 is wound between the upper side of the engine pulley 27 and a blade pulley 4 attached to the upper end of the blade shaft 3 of the mower device K, and a clutch mechanism is provided that can turn on and off the power transmission to the blade pulley 4 by tensioning or loosening the blade V-belt 25 with a tension pulley 28. The cutting blade 5 including the cutting blade 29 is pivoted to the lower end of the cutting blade shaft 3, and B is a brake mechanism for quickly stopping the inertial rotation of the cutting blade 5 when the transmission to the cutting blade pulley 4 is cut off by the clutch mechanism.

[0013] The mowing device K is attached to a pair of left and right front link arms 30L, 30R and rear link arms 31L, 31R that are suspended from the vehicle body 14, with the front upper sides of the front link arms 30L, 30R and the rear link arms 31L, 31R pivoted to the vehicle body 14 side and the rear lower sides pivoted to the cutting blade cover 1 side of the mowing device K, and the operator can adjust the grass cutting height by operating the lifting lever 32 up and down to raise and lower the mowing device K in a substantially horizontal position via the lifting link mechanism 33. An outer periphery cover 34 is provided at the front end of the mowing device K across the left and right width of the cutting blade cover 1, and an elastic cover 50 is also provided at the center of the rear end of the mowing device K.

[0014] A blade shaft boss 3a is fixed to the center of the top plate 2 of the blade cover 1, penetrating the top plate 2 in the vertical direction, and the blade shaft 3 is inserted and pivoted within the blade shaft boss 3a. A flared bulge 10 is provided on the outer periphery of the blade shaft boss 3a, through which the blade shaft 3 is inserted, on the upper side of the top plate 2 of the blade cover 1, and a blade pulley 4 that rotates approximately horizontally is provided on the upper end of the blade shaft 3 above the bulge 10. The lower end of the blade shaft 3 protrudes downward from the blade shaft boss 3a, and a blade base 38 is fitted into this protrusion and screwed together with the blade blade 29 to the blade shaft 3 with a nut 40. The blade blade 29 and the blade base 38 are attached with a bolt 41, and the blade 5 including the blade blade 29 rotates approximately horizontally within the blade cover 1. Reference numeral 39 denotes a reinforcing plate that maintains the strength of the blade shaft boss 3a, and 42 denotes a water discharge tray, which is a cleaning device that supplies water (not shown) from above into the water discharge tray 42 and rotates the blade 5, thereby forcefully discharging water onto the underside of the top plate 2 of the blade cover 1 by centrifugal force, thereby washing away adhering grass and soil. The blade 5 in this embodiment is a large-diameter blade that is rotatably attached to both ends of the blade 29, but may also be a small-diameter blade that has blade portions formed on both ends of the blade 29.

[0015] The horizontal surface 6 of the blade pulley 4 is provided with a plurality of dust discharge blades 8 protruding downward and a plurality of suction holes 7. A pulley guard 9 having a width substantially equal to or wider than the vertical width W between the blade pulley 4 and the dust discharge blade 8 is provided along the outer periphery 4a of the blade pulley 1 in a range including the vertical width W between the blade pulley 4 and the dust discharge blade 8 in a side view and at a position of a predetermined height H from the top plate 2 of the blade cover 1. The pulley guard 9 shown in FIG. 3 is configured such that a belt stopper 37 is provided on the inside thereof separately from the top plate 2 or the bulging portion 10. FIG. 4 shows a configuration of another embodiment in which the pulley guard 9 along the outer periphery 4a of the blade pulley 4 is brought even closer to the outer periphery 4a to also serve as a belt stopper. As shown in Figure 5, when the blade pulley 4 rotates due to the transmission of the blade V-belt 25, the air around the upper part of the blade pulley 4 is sucked in through the suction holes 7 by the action of the dust exhaust blade 8, and the sucked air is discharged toward the outer periphery and downward of the blade pulley 4. However, without the pulley guard 9, the wind discharged toward the outer periphery of the dust exhaust blade 8 is discharged without acting on the grass placed on the top plate 2 of the blade cover 1 and is wasted. However, by providing a pulley guard 9 that is approximately the same width as the vertical width W of the blade pulley 4 and dust exhaust blade 8 or wider than the vertical width W, the wind discharged toward the outer periphery of the dust exhaust blade 8 hits the inside of the pulley guard 9 and changes the flow of the wind downward, allowing the grass placed on the top plate 2 to be efficiently discharged to the outside. In addition, a flared bulge 10 is provided on the outer periphery of the blade shaft boss 3a on the top plate 2 of the blade cover 1, so that grass and grass in the vicinity of the blade shaft boss 3a can be easily discharged outward along the flared inclined upper surface, allowing grass and grass to be efficiently discharged even with a weak wind force. By attaching the blade shaft boss 3a that pivots the blade shaft 3 to the bulge 10, the blade shaft boss 3a is supported by both the top plate 2 and the bulge 10, so that the rigidity of the blade cover 1 and the blade shaft boss 3a can be maintained at a high level. Furthermore, a wide pulley guard 9 is provided, so that it is difficult for any part of the body to directly come into contact with the rotating blade pulley 1 from the side, improving safety.

[0016] FIG. 6 shows another embodiment in which the dust discharge blade 8 is attached in a different manner. In FIG. 6(a), the dust discharge blade 8 is attached at an angle in which the phase of the far side of the dust discharge blade 8 is delayed relative to the rotation direction of the blade pulley 4 compared to the side close to the blade shaft 3. This configuration can increase the wind force in the circumferential direction of the side of the dust discharge blade 8. In FIG. 6(b), the dust discharge blade 8 is attached in the same position as in FIG. 6(a), and further, the dust discharge blade 8 is attached inclined backward and downward relative to the rotation direction of the blade pulley 4, and the number and size of the suction holes 7 are different, so that not only the wind force in the circumferential direction of the side of the dust discharge blade 8 but also the wind force in the downward direction can be increased. The attachment method and number of the dust discharge blades 8 and the shape and number of the suction holes 7 are not limited to those in the embodiment, and the basic effect is the same even if the shape, size, and number are changed in various ways. Furthermore, the configuration of the mower K of the present invention is not limited to a riding grass mower, but may also be implemented in a walk-behind grass mower, a riding or walk-behind lawn mower, etc., and may also be implemented in a configuration in which a plurality of cutting blades 5 are provided. Furthermore, the location of the mower K is not limited to the central abdominal portion of the vehicle body 14, but may be located on the front or rear side of the vehicle body 14. [Explanation of symbols]

[0017] 1 Blade cover 2. Tabletop 3 Cutting blade shaft 3a Blade shaft boss 4 Blade pulley 4a Outer rim 5 mower blade 6 Horizontal part 7 Suction hole 8 Dust exhaust blade 9 Pulley Guard 10 Bulge H Prescribed height W vertical width

Claims

1. The cutting device for a lawnmower has a blade pulley (4) that rotates approximately horizontally by belt drive at the upper end of a blade shaft (3) that is pivoted to a blade shaft boss (3a) that passes through a top plate (2) of a blade cover (1) from top to bottom, and a blade (5) that rotates approximately horizontally inside the blade cover (1) at the lower end of the blade shaft (3). The cutting device has a horizontal surface (6) of the blade pulley (4) with multiple suction holes (7) and multiple suction holes (8) protruding downward from the horizontal surface (6). A cutting device for a lawnmower, characterized in that several dust discharge blades (8) are provided, and a pulley guard (9) having a width approximately the same as or wider than the vertical width (W) between the cutting blade pulley (4) and the dust discharge blade (8) is provided along the outer circumferential edge (4a) of the cutting blade pulley (4), in a range including the vertical width (W) between the cutting blade pulley (4) and the dust discharge blade (8) when viewed from the side, and at a predetermined height (H) from the top plate (2) of the cutting blade cover (1).

2. 2. The cutting device for a lawn mower according to claim 1, wherein a flared bulge (10) is provided on an outer periphery of a blade shaft boss (3a) on the upper side of the top plate (2) of the blade cover (1).

3. 3. The mowing device for a lawnmower according to claim 1 or 2, characterized in that a pulley guard (9) is provided that approaches along the outer circumferential edge (4a) of the cutting blade pulley (4) over the belt winding range of the cutting blade pulley (4), and the pulley guard (9) also functions as a belt stopper.

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